JPH03274605A - Illuminating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention uses a low pressure discharge lamp such as a fluorescent lamp as a light source,
The present invention relates to a lighting device suitable for backlights of liquid crystal televisions and liquid crystal meters.

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

This type of backlight has traditionally housed a hot cathode or cold cathode fluorescent lamp in a shallow dish-shaped casing.
A lighting device is used in which the light emitted from the lamp is reflected by a reflective surface formed in a casing and illuminated on the back side of a liquid crystal panel through a light diffusing and transmitting plate installed in an opening of the casing.

When a hot cathode or cold cathode fluorescent lamp is used as a light source, compared to an incandescent lamp, these fluorescent lamps have superior luminous efficiency, generate less heat, have a longer lifespan, and have a longer discharge path, so their light emitting area is smaller. It has the advantage that it is large and the light distribution can be easily made 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. This is advantageous for illuminating a display surface with uniform brightness.

By the way, when such a bent fluorescent lamp is fixed inside a casing, it is necessary to support the lamp so that it will not be damaged even if vibrations or shocks are applied to the entire device from the outside.

For this reason, a structure is adopted in which the bent portion and both ends of the lamp are supported by a lamp holder made of an elastic material such as silicone rubber. When supporting the end of the lamp with a lamp holder made of an elastic material such as silicone rubber, the lamp holder is made cylindrical, the end of the lamp is inserted into the insertion hole formed in the lamp holder, and the lamp holder is It is fixed to the casing.

(Problem S to be solved by the invention) However, the insertion hole formed in the lamp holder must have a diameter slightly larger than the lamp bulb diameter in order to allow the lamp to pass through. If the end of the bulb is inserted into the lamp, it may rattle, and if vibration or shock is applied, the lamp may move and be damaged.
There is a concern that the reliability of the lamp support function will be impaired.

An object of the present invention is to provide a lighting device that can reliably support a lamp holder and prevent rattling between the lamp and the lamp holder.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a lamp holder made of an elastic material, in which an end portion of a discharge lamp is passed through an insertion hole formed in a lamp holder made of an elastic material, and is supported by the lamp holder. It is characterized by being clamped in the axial direction by the casing or a member fixed to the casing and a clamping plate.

(Function) According to the present invention, since the lamp holder is clamped in the axial direction between the casing or the member fixed to the casing and the clamping plate, the lamp holder can be supported with a simple structure, and the lamp holder can be supported in the axial direction. When it is compressed, it elastically deforms to reduce the diameter of the insertion hole, so the bulb can be held against the inner surface of the insertion hole, and the lamp can be prevented from wobbling. Moreover, this structure is simple because it only requires clamping the lamp holder in the axial direction.

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

In the figure, 1 is a casing with an open top surface;
For example, it is made of a metal such as conductive aluminum clay. This casing 1 has a lamp accommodating part 2 having a relatively large area on one side, and a wiring board accommodating part 3 on the other side.

The lamp accommodating portion 2 has a shallow dish shape, and a reflective surface 4 is formed on the inner surface.

The wiring board accommodating portion 3 is a rectangular recess and has a deeper bottom wall than the lamp accommodating portion 2.

The opening on the upper surface of the casing 1 is used as an irradiation part, and a fixing collar 5 for attaching the casing 1 to the main body chassis of a liquid crystal display device is formed in this opening. ... are formed with mounting holes 6.

A bent fluorescent lamp 7 is accommodated in the casing 1 . The fluorescent lamp 7 of this embodiment is a W-shaped cold cathode fluorescent lamp, and this fluorescent lamp 7 has a bulb 8 whose bottom is bent into a W-shape, and the bulbs 8 are arranged in straight lines substantially parallel to each other. and these straight parts are U
Electrical conduction is established at the letter-shaped bent portions 9g, 9b, and 9c. Cold cathode type electrodes 11.11 are sealed to both ends 10.10 of the bulb 8.

A phosphor coating (not shown) is formed on the inner surface of the bulb 8, and a predetermined amount of mercury and a starting rare gas such as argon or xenon are sealed inside the bulb 8.

The fluorescent lamp 7 having such a configuration has both ends 10.10.
faces the wiring board accommodating part 3, and the other parts are accommodated in the lamp accommodating part 2.

This lamp 7 is supported by lamp holders 12, 13, 13.

The lamp holders 12, 13, 13 are made of an elastic material such as white silicone rubber.

One lamp holder 12 is a bulb 8 bent into a W shape.
A recess 1 into which the two U-shaped bent portions 9a and 9b fit.
2a and 12b, and is arranged at the other end of the lamp housing section 2. The lamp holder 12 has a presser tongue piece 14 formed by cutting and raising the bottom wall of the lamp accommodating portion 2.
It is held down immovably by the casing 1 and a light diffusing and transmitting plate 20, which will be described later.

The other two lamp holders 13.13 are fluorescent lamps 7
Through holes 13a, 13a through which both ends 10.10 of the
These lamp holders 13, 13 are housed in the wiring board accommodating portion 3, and are supported by means described later.

A light diffusing and transmitting plate 20 is attached to the upper opening of the lamp accommodating portion 2 in the casing 1 . The light diffusing and transmitting plate 20 is made of a milky white material such as acrylic resin and has a light diffusing and transmitting effect.The lower surface (or upper surface may be used) of this light diffusing and transmitting plate 20 is made of a milky white material such as acrylic resin. Thick portions 21 are formed in opposing portions.

The thickness of these thick portions 21 gradually becomes thinner as the distance from the valve 8 increases.

The light diffusing and transmitting plate 20 is fixed to the casing 1 by bending and caulking fixing pieces 22 formed at the opening of the casing 1 so as to cover the upper opening of the lamp accommodating portion 2 . Therefore, the negative lamp holder 12 is held between the bottom wall of the lamp accommodating portion 2 and the light diffusing and transmitting plate 20.

The wiring board accommodating portion 3 of the casing 1 includes a heat conductive plate 2.
5.25, the wiring board 30 and both ends 10.10 of the fluorescent lamp 7 are accommodated.

The heat conduction plates 25.25 are each formed of a metal band plate with excellent thermal conductivity, and each has a holder accommodating portion 26 at one end. This holder accommodating portion 26 has a tunnel shape into which the lamp holder 13 is inserted. These heat conduction plates 2
A band-shaped portion 27.27 extending to the other end of 5.25 is attached to the outer bottom surface of the casing 1 and fixed to the casing 1 by caulking, engagement, welding, or other means. The holder accommodating portions 26.26 of these heat conductive plates 25.25 are placed in the wiring board accommodating portion 3 through an opening 28 formed in the boundary wall between the lamp accommodating portion 2 and the wiring board accommodating portion 3 of the casing 1. There is.

The two lamp holders 13 and 13 are connected to the heat conductive plate 25.
．． The insertion holes 13a, 13a formed in these lamp holders 13.13 are accommodated in the holder accommodating portions 26.26 of 25.
Both ends 10° 10 of the lamp 7 are penetrated.

In the case of this embodiment, these lamp holders 13.1
3 is pressed in the axial direction between the wiring board 30 and the clamping plate 40, and is held by these heat conductive plates 25, 25, the wiring board 30, and the clamping plate 40.

Although not shown, the wiring board 30 has high-frequency lighting circuit components such as an inverter transformer, a capacitor, etc. on the side.
Noise filter etc. are implemented.

This wiring board 30 is housed vertically in the wiring board accommodating portion 3 and is fixed. In other words, the wiring lined board housing section 3
A large number of support protrusions 31 are cut and raised inward on the side wall of the board, and the vertically placed wiring board 30 is held by these support pieces 31 on one side and the other side. , these support pieces 31... are caulked and firmly fixed. Note that the upper end of the wiring board 30 is held down by a cover 32 that covers the wiring board accommodating portion 3 to prevent it from coming off upward.

This cover 32 covers only the top opening of the wiring board accommodating part 3 in the casing 1, and is fixed to the casing 1 by locking pieces 33 formed at the upper end of the wiring board accommodating part 3. There is.

On such a wiring board 30, the lamp holder 13.
Through holes 34.34 are formed through which both ends 10.10 of the lamp 7 protruding from 13 are formed, and fixing holes 35 through which screws are passed are formed around these through holes 34.34. There is.

The holding plate 40 is arranged on the opposite side of the lamp holder 13 13 facing the wiring board 30 . This holding plate 40 may be made of metal or synthetic resin,
An insertion hole 41 through which both ends 10 and 10 of the lamp 7 are loosely inserted.
41 are formed, and fixing holes 42 through which screws are passed are formed around these insertion holes 41, 41.

Screws 45... are inserted into these fixing holes 42..., these screws 45... are passed through fixing holes 35... formed in the wiring board 30, and screwed into nuts 46... has been done. Therefore, the screws 45... are hooked between the wiring board 30 and the clamping plate 40, and these screws 45...
By tightening ..., the distance between them can be narrowed.

A lamp holder 13.13 accommodated in a holder accommodating portion 26.26 of the heat conductive plate 25.25 is held between the wiring board 30 and the holding plate 40 while being pressed in the axial direction.

These lamp holders 13.13 are compressed in the axial direction by being squeezed between the wiring board 30 and the clamping plate 40,
For this reason, the inner diameters of the insertion holes 13a, 13a are reduced and they are crimped onto the outer surface of the lamp 7. Therefore, the lamp 7 is supported by these lamp holders 13, 13 without wobbling.

Further, when the lamp holder 13.1B is pinched between the wiring board 3° and the clamping plate 40, the outer diameter also expands, so that the outer surface of the lamp holder 13.13 is in the holder housing area of the heat conductive plate 25.25. 26. Pressed against the 26 inner surface. Due to this pressure contact, the lamp holder 13° 13 is in close contact with the heat conduction plate 25.25 over a wide area, making it possible to conduct good heat, and since the outer diameter is prevented from expanding any further, the inner diameter is further reduced. The lamp 7 is reduced in size to firmly hold the lamp 7.

Note that there are holes 39 for heat dissipation in the side wall of the wiring board accommodating portion 3.
・is formed.

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

When the fluorescent lamp 7 is connected to the lighting circuit components of the wiring board 35 and high-frequency power is applied to the lamp 7 to light it, the lamp 7 emits light in a shape along the W-shaped bulb 8.

A part of the light emitted from the fluorescent lamp 7 is reflected by the reflective surface 4 of the lamp accommodating part 2 and directed to the light diffusing and transmitting plate 20 in the opening, and the remaining light is directly directed to the light diffusing and transmitting plate 20. . Therefore, almost all of the light emitted from the lamp 7 is irradiated to the outside through the light diffusing and transmitting plate 20.

In this case, since the thick portions 21 are formed on the inner surface of the light diffusing and transmitting plate 20 facing the substantially parallel linear portions of the W-shaped bulb 8, the thick portions 21 exist directly above the bulb 8. However, the amount of light transmitted through this thick portion 21 is reduced, and the amount of light transmitted increases as the thickness decreases as the distance from the thick portion 21 increases.

Therefore, the light diffusing and transmitting plate 20 has the effect of eliminating brightness unevenness by itself.

For this reason, the brightness distribution on the light diffusing and transmitting plate 20 is equalized, uneven brightness is reduced, and uniform brightness can be achieved over the entire surface.

The bent fluorescent lamp 7 housed in the casing 1 has two U-shaped bent portions 9a.

9b is supported by a lamp holder 12 made of an elastic material, and both ends 10.1o are also supported by lamp holders 13.13 made of an elastic material, so even if vibrations or shocks are applied from the outside, , these lamp holders 12.
13.13, and damage to the lamp 7 is prevented.

In this case, one lamp holder 12 is held between the casing 1 and the light diffusion/transmission plate 20, and is also held down by the presser tabs 14 cut and raised from the bottom wall of the lamp accommodating portion 2. It is immovable, and the support structure of this lamp holder 12 is simple.

Furthermore, since the other two lamp holders 13.13 that supported both ends 10, 10 of the fluorescent lamp 7 are held between the wiring board 30 and the holding plate 40, these lamp holders 13.1:3 The support structure is simple.

In this case, the lamp holder 13.13 is pinched between the wiring board 30 and the clamping plate 40 and compressed in the axial direction, so the inner diameter of the insertion holes 13a, 13a is reduced and the lamp holder 13.13 is crimped onto the outer surface of the lamp 7. Therefore, the lamp 7 is supported by these lamp holders 13, 13 without wobbling.

Therefore, even if vibration or impact is applied, the lamp 7 will not be damaged.

Furthermore, the outer diameter of the lamp holder 13.13 expands as it is squeezed between the wiring board 30 and the clamping plate 40, so that the outer surface of the lamp holder 13.13 is connected to the heat conductive plate 25.2.
The holder accommodating portion 26 of No. 5 is pressed against the inner surface of 26. By this pressure contact, the lamp holder 13.13 is attached to the heat conductive plate 25.25.
It is in close contact with the surface over a wide area, allowing for good heat conduction.

That is, while the lamp is lit, heat is emitted from the cold cathode 11 and the temperature of the bulb end 10 increases. This heat is conducted from the holder accommodating portion 26.26 to the heat conduction plate 25.25 via the lamp holder 13.13, and then to the casing 1. Since the casing 1 has a large heat dissipation area, it can dissipate the heat from the bulb end 10 and prevent the temperature of the bulb 8 from rising.

Further, the outer surface of the lamp holder 13.13 is provided with a heat conductive plate 25.
Since the holder housing portion 26 of the lamp 7 is pressed against the inner surface of the holder housing portion 26 and the outer diameter is prevented from further expanding, the inner diameter is further reduced when the wiring board 30 and the clamping plate 40 are pressed together.
The lamp 7 is in elastic contact with the lamp 7 to reliably support the lamp 7.

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

That is, in the above embodiment, the lamp holder 13° 13 is held between the wiring board 30 and the clamping plate 40, but in the case of a lighting device that does not include the wiring board 30,
The lamp holder 13.13 may be held between the casing 1 and the holding plate 40.

Further, in the above embodiment, the wiring board 30 is fixed and the clamping plate 40 is pulled toward the wiring board 30 by the screw 45 to clamp the lamp holder 13.13 in the axial direction. The board 40 may be fixed and the wiring board 30 may be pulled toward it.

Further, the present invention is not limited to the use of the heat conductive plate 25.

In addition to the W-shape, the fluorescent lamp may have a U-shape, a straight tube shape, etc., and one or a plurality of fluorescent lamps may be used.

Furthermore, the present invention may be a rare gas discharge lamp in which the bulb is not filled with mercury but only with a rare gas.

Further, the lamp is not limited to one that is lit at a high frequency.

[Effects of the Invention] As explained above, according to the present invention, the lamp holder made of an elastic body is held in the axial direction between the casing or the member fixed to the casing and the holding plate, so that the lamp holder can be easily supported. In addition, when the lamp holder is compressed in the axial direction, it elastically deforms to reduce the diameter of the insertion hole, so the bulb can be held against the inner surface of the insertion hole, thereby preventing the lamp from wobbling. I can do it. Furthermore, since this structure only requires clamping the lamp holder in the axial direction, the number of parts is small and no assembly effort is required.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an exploded perspective view of the whole, Fig. 2 is a plan view showing a partially cut away light diffusing and transmitting plate, and Fig. 3 is a section of ■-■ in Fig. 2. FIG. DESCRIPTION OF SYMBOLS 1...Casing, 2...Lamp accommodating part, 3...
Wiring board housing part, 7... Fluorescent lamp, 8... Bulb, 9a, 9b, 9c... Bent part, 10... Bulb end, 11... Electrode, 12.13... Lamp holder, 13a. 13a... Insertion hole, 20... Light diffusion and transmission plate, 25... Heat conduction plate, 26...
...Holder housing part, 30... Wiring board, 40... Holding plate, 45... Screw.

Claims (1)

[Scope of Claims] A lighting device in which a low-pressure discharge lamp is housed in a casing provided with an irradiation part on one side, and the light emitted from the discharge lamp is irradiated from the irradiation part of the casing. The end of the electric light is passed through an insertion hole formed in a lamp holder made of an elastic material and supported by the lamp holder, and the lamp holder is axially clamped between the casing or a member fixed to the casing and a clamping plate. A lighting device characterized by: