WO2007139016A1

WO2007139016A1 - Backlight device

Info

Publication number: WO2007139016A1
Application number: PCT/JP2007/060702
Authority: WO
Inventors: Tsukasa Kaji; Yuji Takeda; Hidetoshi Yano; Kazuya Nakamura; Masami Takagi
Original assignee: Harison Toshiba Lighting Corporation
Priority date: 2006-05-26
Filing date: 2007-05-25
Publication date: 2007-12-06
Also published as: TW200813566A; JP2007316388A

Abstract

A backlight device having a housing (2) with a bottom and an opening, a flat fluorescent lamp (4, 4a) received in the housing (2), an external electrode (3) provided on the flat fluorescent lamp (4, 4a), a power supply member (5) contactingly placed on the external electrode (3) so as to supply electric power to the electrode (3), a pressing member (6) for pressing the power supply member (5) against the external electrode (3), an optical surface member (7) placed on the upper side of the pressing member (6), a picture frame-like frame body (8) fixed to the housing (2) so as to press and hold both the power supply member (5) and the pressing member (6) from the upper side of the optical surface member (7). The external electrode (3) and the power supply member (5) are in contact with each other by pressing force of the pressing member (6), and thereby electrical connection is achieved.

Description

Specification

Knocking light device

Technical field

The present invention relates to a backlight device used as a backlight light source of a liquid crystal display device, and more particularly to a backlight device using a flat fluorescent lamp using dielectric barrier discharge.

[0002] As a light source of a backlight device used in a liquid crystal display device, a surface light source in which a plurality of cold cathode fluorescent lamps having an elongated cylindrical discharge space in which mercury is sealed is arranged in parallel has been used. . However, a flat fluorescent lamp with a flat discharge space has been developed as a light source that can provide a more uniform light emitting surface, but it has been used in backlights for monitors for PCs and monitors for large LCD TVs. Come on.

In addition, as such a flat fluorescent lamp, a dielectric barrier discharge type flat fluorescent lamp having an external electrode is used. This dielectric barrier discharge type flat fluorescent lamp is known to have high luminance, uniform luminance distribution, and low power consumption (see, for example, JP-A-10-222083).

[0004] This flat fluorescent lamp includes a front plate made of, for example, soda glass, an interval between the front plate and an insulating substrate made of soda glass, ceramic, etc. arranged in parallel, and these front plates. And a side plate that hermetically seals the periphery of the insulating substrate. The side plate is made of, for example, soda glass or the like, and is fixed to the front plate and the peripheral portion of the insulating substrate with low melting point glass to form a flat sealed discharge space therein. A phosphor is applied to the surface of the insulating substrate inside the discharge space. In addition, mercury and a mixed gas such as argon or neon argon or a rare gas discharge gas such as xenon, krypton, argon, helium, or neon are sealed in the discharge space as a starting gas. A pair of strip-like electrodes parallel to each other are provided on the outer surface of the front plate. These electrodes are located at both ends of the discharge space. These electrodes are formed, for example, by bonding a metal tape such as aluminum with an adhesive such as an acrylic adhesive.

[0005] Also, a dielectric barrier discharge having a planar discharge space partitioned by elongated discharge cells Type flat fluorescent lamps are also known (see, for example, JP-A-2005-32722).

[0006] As described above, in the case of a dielectric barrier discharge type flat fluorescent lamp used as a light source of a backlight device, the external electrode is an acrylic adhesive with a metal tape such as aluminum on the front plate of the surface light source device. It is bonded with an adhesive such as a bonding agent. In addition, the connection between the external electrode and the lead wire is performed by solder joint. In this case, soldering to aluminum tends to be uncertain in terms of work. For example, there is a risk of frequent solder removal, which is not preferable. In particular, in mass production, there is a high possibility that such a solder detachment will occur or that the lead wire will be disconnected soon.

[0007] The present invention has been made based on these circumstances, and a back using a dielectric-no-discharge type flat fluorescent lamp having a structure that allows a lead wire to be reliably connected to an external electrode with a simple structure. For the purpose of providing a light device!

[0008] In order to achieve such an object, the backlight device of the present invention includes a housing having an opening and a bottom for housing each member in a stacked manner, and at least one external electrode housed in the housing. A flat lamp, a power supply member disposed above the external electrode, a pressing member disposed above the power supply member, an optical surface member disposed above the pressing member, and an optical surface member A frame-like frame body fixed to the housing so as to hold the power feeding member and the pressing member,

The external electrode and the power feeding member are abutted and fixed by a pressing force of the pressing member.

[0009] Further, the backlight device of the present invention is characterized in that a contact surface of the power supply member with the external electrode is formed in a concave / convex shape.

[0010] Further, in the backlight device of the present invention, the power feeding member and the external electrode are in contact with each other.

The pressing member is elastically deformed.

[0011] Further, in the backlight device of the present invention, the pressing member is an arch-shaped elastic insulating member fixed to the casing with a screw.

[0012] According to the present invention, an external electrode type dielectric barrier discharge type flat fluorescent lamp The external electrode can be reliably and reliably connected to the lead wire, and the power supply thereby causes the external electrode type dielectric barrier discharge type flat fluorescent lamp to emit light as a good surface light source. That's the power S.

Brief Description of Drawings

FIG. 1 is a partially cut perspective view of a backlight device showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

3 is a cross-sectional view of a flat fluorescent lamp used in the backlight device shown in FIG.

FIG. 4a is a perspective view of a power feeding member used in a backlight device according to a second embodiment of the present invention.

FIG. 4b is a bottom view of the power supply member shown in FIG. 4a.

FIG. 5a is a bottom view showing another example of the power feeding member shown in FIG. 4a.

FIG. 5b is a perspective view showing the structure of the pressing member shown in FIG. 4a.

FIG. 6a is a cross-sectional view showing the main configuration of a backlight device according to a third embodiment of the present invention.

FIG. 6b is a plan view showing the main configuration of the backlight device shown in FIG. 6a.

FIG. 6c is a perspective view of a flat fluorescent lamp used in the backlight device shown in FIG. 6a.

FIG. 7a is a cross-sectional view showing the main configuration of a backlight device according to a fourth embodiment of the present invention.

FIG. 7b is a plan view showing the main configuration of the backlight device shown in FIG. 7a.

FIG. 8a is a cross-sectional view showing the main configuration of a backlight device according to a fifth embodiment of the present invention.

FIG. 8b is a perspective view of a housing used in the backlight device shown in FIG. 8a.

FIG. 9 is a cross-sectional view showing the main configuration of a backlight device according to a sixth embodiment of the present invention.

FIG. 10 is a cross-sectional view showing the main configuration of a backlight device according to a seventh embodiment of the present invention.

FIG. 11 is a cross-sectional view showing the main configuration of a backlight device according to an eighth embodiment of the present invention.

Hereinafter, embodiments of the backlight device of the present invention will be described with reference to the drawings.

In the following description, a dielectric barrier discharge type flat fluorescent lamp having an external electrode used as a light source of a backlight device is simply referred to as a flat fluorescent lamp.

[0016] (Example 1) FIG. 1 is a partially cut perspective view of a backlight device showing a first embodiment of the present invention. FIG. 2 is an exploded perspective view thereof. This backlight device is a so-called direct backlight device.

[0017] The knocklight device 1 has a casing 2 in which an opening 2c is formed by a bottom plate 2a and a side plate 2b erected from the bottom plate 2a. A flat fluorescent lamp 4 having a pair of external electrodes 3 is housed on the bottom plate 2a in the housing 2! /. On the external electrode 3 of the flat fluorescent lamp 4, a power supply member 5 that is in contact with and fixed to the external electrode 3 and electrically conductive, an insulating pressure member 6 that holds the power supply member 5, and the pair of pressure members An optical surface member 7 that is formed of a translucent milky white resin plate in close contact with 6 and is used to achieve uniform brightness over the entire light emitting surface is sequentially laminated. The optical surface member 7 is composed of a diffusion plate, an optical sheet, or a combination thereof. The laminated members are pressed by the frame 8 to be housed and fixed in the inside of the housing 2, and the whole member is incorporated into the housing 2 and integrally formed to form the backlight device 1. The power supply member 5 is connected to a power source side 10 such as a high-frequency inverter via a harness (lead wire) 9.

[0018] The structure of the flat fluorescent lamp 4 is shown in FIG. 3 as a partially cutaway cross-sectional view. In other words, the two translucent glass plates l la and l ib that face each other and form the discharge vessel 11 face each other and are hermetically sealed. The phosphor layer 12 is applied to at least one of the inner surfaces of the glass plates l la and l ib. Inside the discharge vessel 11, mercury vapor, neon, argon, xenon, krypton, or helium rare gas forms a discharge space in which a single or mixed discharge medium is enclosed.

The pair of external electrodes 3 are formed on the outer surface of the glass plate 11a by a film-like or tape-like conductor by ultrasonic solder dubbing, conductive paste application, printing, or the like.

[0020] The power supply member 5 is a metal material such as stainless steel, aluminum, or copper, and is formed by press-molding a plate material having a thickness of 1 mm or less into a predetermined shape such as a rectangular shape. A lead wire 9 (harness) is connected to the power supply member 5 by soldering. The lead wire 9 is connected to a power feeder (power source side) 10 having an inverter configuration. By applying a high-frequency sine wave voltage to the external electrode 3 from the power supply device, the flat fluorescent lamp 4 starts discharging, Ultraviolet rays are emitted from the discharge medium. This ultraviolet light is converted into visible light by the phosphor layer 12. Thereby, the flat fluorescent lamp 4 can be used as a flat light source. As the solder that joins the lead wire 9 to the power supply member 5, lead-free solder that does not contain lead, such as tin-silver-copper alloy, is used.

[0021] The holding member 6 is in contact with and fixed to the power supply member 5 by being brought into surface contact, and at least the contact surface with the power supply member 5 is formed of silicon rubber, foamed plastic, or the like, which is an insulating elastic member. Yes.

[0022] The optical surface member 7 made of a diffusion plate or an optical sheet is made of a milky white resin plate having a predetermined thickness, and is spaced apart from the flat fluorescent lamp 4 at a predetermined interval. The optical surface member 7 has a function of diffusing the light emitted from the flat fluorescent lamp to improve the luminance uniformity of the light.

[0023] The optical sheet constituting the optical surface member 7 is a condensing sheet having a function of condensing the light diffused through the diffusion plate and improving the luminance of the light. The optical sheet can include a diffusion sheet for diffusing light diffused through the diffusion plate again. In addition, the addition or removal of an optical sheet is required depending on the required luminance characteristics of the liquid crystal display device.

[0024] The frame body 8 has a plastic or metal lid structure and is formed so as to be fitted to the housing 2.

In assembling the nocrite device 1, the members are stored in a predetermined order via the opening 2 c of the housing 2. In a state where the entire stored member is pressed by the frame body 8 with a predetermined pressing force, the frame body 8 is fixed and integrated with the housing 2 by a fastening means (not shown) such as a screw or a stopper. Yes. At the time of fastening, since the pressing member 6 is an elastic member, due to the pressing force due to the elastic deformation of the pressing member 6, each member receives a predetermined pressing force and is fixed at a predetermined position, so that the mutual displacement is not caused. Is prevented.

[Example 2]

FIG. 4a is a perspective view of a main part of a direct type backlight device according to the second embodiment of the present invention, and FIG. 4b is a bottom view thereof.

In this embodiment, a housing, a flat fluorescent lamp, a diffusion plate, an optical sheet, and The frame is the same force as the case 2, the flat fluorescent lamp 4, the diffuser plate and the optical sheet, and the frame 8 in the first embodiment. The power supply member 5 and the pressing member 6 in the first embodiment have shapes. Different.

[0028] That is, the power supply member 5 'in Example 2 is made of a metal material such as stainless steel, aluminum, or copper, as in Example 1, as shown in Fig. 4a and the bottom view in Fig. 4b. Is formed. However, a plurality of striped uneven grooves 5′c are formed on the lower surface side of the power feeding member ^. Further, the upper surface side is formed so that the central portion 5'a is higher than the both side portions 5'b. That is, it is press-molded so that the cross section of the power supply member 5 ′ is convex. In addition, a lead wire 9 is connected to either one of both side portions 5′b by a solder 9a at a predetermined position in the longitudinal direction of the power supply member 5 ′.

[0029] In FIGS. 4a and 4b, the force S in which the stripe-shaped uneven groove 5'c is engraved on the lower surface side of the power feeding member 5 ', and the lower surface of the power feeding member ^ as shown in FIG. 5a. The side is to be formed in the concave and convex groove 5d having a staggered pattern.

[0030] As shown in the perspective view of Fig. 5b, the pressing member 6 'is provided with a first recess 6'a along the longitudinal direction on the lower surface of the main body 6' made of a strip-like insulator. . The first recess 6′a is formed along the longitudinal direction of the band-shaped main body 6 ′ so as to be fitted to the protrusion formed on the upper surface of the power supply member 5 ′ shown in FIG. 6a. Further, a second position in the width direction of the band-shaped main body 6 ′ is provided on a lower surface of a predetermined position in the longitudinal direction of the band-shaped main body 6 ′, that is, a position corresponding to a position where the lead wire 9 of the power supply member 5 ′ is connected. The recess 6'b is formed. The second recess 6'b accommodates the lead wire 9 and the solder 9a connected to the power feeding member 5 'in the recess. For this reason, it is possible to closely contact the upper surface of the pressing member 6 and the power feeding member ^ regardless of the presence of the lead wire 9 and the solder 9a.

[0031] As with the above-described first embodiment, the knocklight device la is assembled in such a manner that each member is stored in a predetermined order via the opening 2c of the housing 2, and the entire stored member is stored in the frame body 8. In a state where the frame 8 is pressed with a predetermined pressing force, the frame 8 is fixed and integrated with the housing 2 by a fastening means (not shown) such as a screw or a stopper. At the time of fastening, since the pressing member 6 ′ is an elastic member, each member receives a predetermined pressing force and is fixed at a predetermined position due to the pressing force generated by the elastic deformation of the pressing member 6 ′, causing displacement. There is no. In addition, since the concave and convex grooves 5′c and 5′d are formed on the lower surface side of the power supply member 5 ′, that is, the surface in contact with the external electrode 3, the external electrode 3 and the power supply member 5 are formed. 'And can be accurately aligned without causing misalignment. This provides the desired and sufficient electrical connection.

[0033] (Example 3)

FIG. 6a is a cross-sectional view showing the main configuration of a backlight device according to a third embodiment of the present invention, FIG. 6b is a top view thereof, and FIG. 6c is a view from the back side of the flat fluorescent lamp 4a. FIG.

In this backlight device la, a flat fluorescent lamp 4a having a plurality of elongated discharge spaces formed therein is used! /.

[0035] As shown in Fig. 6a, the flat fluorescent lamp 4a has a front glass plate 1 lc and a rear glass plate 1 Id on which an inner surface is coated with a phosphor to form a phosphor layer (not shown). Are arranged. The front glass plate 11c uses a flat glass, and fulfills the function of transmitting light through it. The back glass plate id uses curved glass processed into a corrugated shape, and fulfills the function of emitting light emitted from the phosphor in the front direction. Therefore, the thickness of the phosphor layer requires 5 to 20 m for the front glass plate 11c, while the rear glass plate 11d requires 60 am force and 120 μm! /.

[0036] In addition, the flat fluorescent lamp 4a has a corrugated curved surface of the rear glass plate l id, the convex portion l ie being in contact with the front glass plate 1 lc, and the front glass plate 1 lc and the rear glass plate 1 Id. In addition to functioning as a spacer that maintains a constant spacing, it also functions as a bulkhead to form multiple elongated discharge spaces.

[0037] Further, as shown in FIG. 6c, the flat fluorescent lamp 4a includes a plurality of elongated glass plates l lc and l id that are hermetically joined to each other by a low-melting glass l lg. A discharge vessel 11 A including a discharge space is formed. In the discharge vessel 11A, a discharge medium in which a rare gas such as mercury vapor neon, argon, xenon, krypton, or helium is used alone or mixed is enclosed.

[0038] A pair of parallel strip-like external electrodes 3 are arranged at both ends of the outer surface of the front glass plate 11c constituting the discharge vessel 11A. These external electrodes 3 are Directional force Disposed in a direction perpendicular to the elongated discharge space 4a. These external electrodes 3 are fixed to the outer surface of the front glass plate 11c with an adhesive, for example. These external electrodes 3 may also be provided on the outer surface of the front glass plate 11c in a detachable manner. These external electrodes 3 are used to generate a dielectric barrier discharge in which the wall (front glass plate 1 lc) constituting the discharge vessel 11A is a dielectric material inside the discharge vessel 11A of the flat fluorescent lamp 4a. .

[0039] The pair of external electrodes 3 formed on both sides of the discharge vessel 11A is connected to the lead wire 9 via a strip-shaped power supply member 5 formed on the surface thereof. The lead wire 9 is connected to a power supply device (power supply side) 10 having an inverter configuration. When a high-frequency sine wave voltage is applied to the external electrode 3, the flat fluorescent lamp 4a starts discharging and emits ultraviolet rays from mercury vapor. This ultraviolet light is converted into visible light by a phosphor layer (not shown) on the inner surface of the discharge vessel 11A.

[0040] The flat fluorescent lamp 4a is placed on the bottom plate 2a forming the housing 2 so that the front glass plate 11c is on the upper side. An arch-shaped electrode pressing member 6a formed of a plastic member is disposed at a position facing the pair of external electrodes 3 on the front glass plate 11c. These electrode pressing members 6a are formed in a strip shape having substantially the same area as the external electrode 3. These electrode pressing members 6a are curved in the form of a arch so that the central portion is convex downward in the longitudinal direction. The electrode pressing member 6a fixes the external electrode 3 on the front glass plate 11c by inertially pressing the external electrode 3 at the center portion curved in an arch shape. The electrode pressing member 6a is fixed to the bottom plate 2c of the housing 2 with screws 14 at both ends in the longitudinal direction. The elastic force applied by the electrode pressing member 6 a can be adjusted by adjusting the screw 14.

[0041] The plastic member used as the electrode pressing member 6a may be one in which the outer surface of the elastic metal member is coated with plastic. Further, an insulating member such as plastic or rubber may be attached to the arch-shaped convex side of the elastic metal member.

Therefore, in this case, the connection between the external electrode 3 and the lead wire 9 is made by connecting the power supply member 5 connected to the lead wire 9 so as to be in close contact with the external electrode 3 by the electrode pressing member 6a. The It is. This eliminates the need for soldering work, and can reliably prevent the occurrence of connection misses due to work failures. As a result, the flat fluorescent lamp 4a can always emit good light.

[0043] (Example 4)

FIG. 7a is a cross-sectional view showing the main configuration of a backlight device according to the fourth embodiment of the present invention, and FIG. 7b is a plan view thereof. In FIG. 7a and FIG. 7b, the same parts as those in FIG. 6a and FIG. 6b are assigned the same reference numerals and their explanations are omitted.

This Example 4 is different from the above Example 3 in the connection structure between the external electrode 3 and the power feeding member 5. Since the other structures are the same as those in the third embodiment, the same reference numerals are given to the same functional parts and the description thereof is omitted to avoid redundant description of the parts of the same structure.

That is, as in Example 3 described above, the main part lb of the backlight device has an external electrode 3 disposed on the outer surface of the front glass plate 1 lc of the flat fluorescent lamp 4a! / RU The external electrode 3 may be arranged in a detachable manner or a non-detachable manner! /, Or may be shifted! /.

[0046] The hermetic discharge vessel 11A acts to cause a dielectric barrier discharge in which the front glass plate 1 lc of the discharge vessel 11A is a dielectric.

Further, the external electrode 3 is connected to the lead wire 9 via the power supply member 5, and the lead wire 9 is connected to the power supply device (power source side) 10 having an inverter configuration.

[0048] The flat fluorescent lamp 4a is placed on the bottom plate 2a forming the housing 2 with the front glass plate 1lc as the upper side. A power supply member 5 is disposed in contact with the upper surface of the external electrode 3 of the front glass plate 11c. A pressing member 6b is disposed in contact with the upper surface of the power supply member 5. The pressing member 6b is formed in a strip shape having substantially the same area as the external electrode 3. The pressing member 6 b is formed by an insulating elastic member 15 such as rubber and a band-shaped fixing member 16 disposed in close contact with the upper surface so as to cover the entire insulating elastic member 15. The fixing member 16 is fixed to the bottom plate 2a of the housing 2 by screws 14 at both ends in the longitudinal direction so as to apply a predetermined pressing force to the insulating elastic member 15. Therefore, it is possible to adjust the pressing force of the insulating elastic member 15 to the power supply member 5 by adjusting the screw 14. [0049] It should be noted that the fixing member 16 and the insulating elastic member 15 forming the pressing member 6b are not separate from each other, and the insulating member 15 is attached to the lower surface side of the fixing member 16. It can also be used.

Therefore, in this case, the connection between the external electrode 3 and the lead wire 9 is such that the power supply member 5 connected to the lead wire 9 is abutted and fixed to the external electrode 3 by the insulating elastic member 15 and the fixing member 16. It is pressed and connected so as to be in close contact. As a result, work such as soldering becomes unnecessary, and it is possible to reliably prevent connection mistakes due to work failures. As a result, the flat fluorescent lamp 4a can always emit good light.

[0051] In Examples 3 and 4 described above, as the flat fluorescent lamp 4a, the front glass plate 1 lc on which the phosphor layer is formed and the rear glass plate 1 Id are opposed to each other. The rear glass plate 11d is made of corrugated curved glass that has been processed! /, And it can be applied even when a flat plate is used as the rear glass plate 1 I d! / ,.

[0052] As described above, in the backlight devices 1, la, and lb according to the above-described embodiments, the connection between the external electrodes 3 of the flat fluorescent lamps 4 and 4a and the power feeding members 5 and 5a is easy. Certainty. In addition, since the connection between the external electrode 3 and the power feeding members 5 and 5a has a simple configuration, a reduction in manufacturing cost can be expected, which is particularly suitable for mass production.

[0053] (Example 5)

FIG. 8a is a cross-sectional view showing a configuration of a main part of a backlight device according to a fifth embodiment of the present invention, and FIG. 8b is a perspective view of a housing used in the backlight device shown in FIG. 8a. In these drawings, the same or corresponding elements as those shown in any of FIGS. 1 to 7 are designated by the same reference numerals, and detailed description thereof is omitted.

In the backlight device shown in the fifth embodiment, a flat fluorescent lamp is provided in the housing 2.

4a is stored. The flat fluorescent lamp 4a has the same structure as the fluorescent lamp shown in FIGS. 6a and 6c, and a front glass plate 11c is disposed on the opening 2c side of the housing 2. FIG. The rear glass plate l id of the flat type fluorescent lamp 4a is placed on a stepped portion 2f arranged in contact with a lamp spacer 2d and a side wall 2b provided at the center of the bottom plate 2a in the housing 2. .

[0055] A strip-shaped external electrode 3 is attached to both end portions of the flat fluorescent lamp 4a on the front glass plate 11c, and a strip-shaped conductive power supply member 5 is disposed in contact therewith. Band-shaped feeding member A pressing member 6 made of an insulating elastic material is laminated on 5! On the pair of pressing members 6 arranged at both ends on the front glass plate 11c of the flat fluorescent lamp 4a, the optical surface member 7 is placed so as to cover the opening 2c in the housing 2. . The peripheral portion of the optical surface member 7 is fixed to the side wall 2b of the housing 2 together with the pressing member 6 by the frame body 8.

[0056] According to this embodiment, the power supply member 5 is configured to be pressed from above and below by the pressing member 6 and the stepped portion 2f in the housing 2, so that the connection between the power supply member 5 and the external electrode 3 is achieved. The reliability of the is improved. Further, in this structure, the rear glass plate id side of the flat fluorescent lamp 4a is floated from the surface of the bottom plate 2c of the casing 2, so that the heat transfer from the lamp 4a to the casing 2 is reduced. In general, in flat fluorescent lamps, the amount of glass forming the discharge vessel is large, and the temperature of the entire discharge vessel does not rise, so the luminous efficiency tends to be low. However, according to this embodiment, since the heat conduction from the flat fluorescent lamp 4a to the housing 2 is small, the luminous efficiency can be increased. In addition, the lamp spacer 2d provided on the bottom plate 2c of the housing 2 uses a large amount of glass and is heavy, and can prevent deflection due to the weight of the flat fluorescent lamp 4a.

[0057] (Example 6)

FIG. 9 is a cross-sectional view showing the main configuration of the backlight device according to the sixth embodiment of the present invention. In this figure, components that are the same as or correspond to the components shown in FIGS. 8a and 8b are assigned the same reference numerals, and detailed descriptions thereof are omitted.

[0058] In the backlight device shown in the fifth embodiment, the force that cuts the pressing member 6 obliquely from the opening 2c side to the bottom 2a side of the housing 2 is different from the fifth embodiment. Other points are substantially the same. According to this embodiment, since the opening of the frame 8 can be widened, a narrow frame backlight device having a wide light emitting surface can be realized. Note that this is only necessary when the pressing member 6 is made of white plastic with excellent reflectivity, but when it is made of rubber, a strong reflective material is applied to the cut surface or a reflective sheet is applied to reduce the loss of light. It is desirable.

[Example 7]

FIG. 10 is a cross-sectional view showing the main configuration of a backlight device according to the seventh embodiment of the present invention. In this figure, components that are the same as or correspond to the components shown in FIGS. 8a and 8b are assigned the same reference numerals, and detailed descriptions thereof are omitted. [0060] In the backlight device shown in Example 7, the flat fluorescent lamp 4a housed in the housing 2 has the same structure as the fluorescent lamp shown in Figs. 6a and 6c. The lath plate l id side is arranged on the opening 2a side of the housing 2. Therefore, the external electrode 3, the power feeding member 5, and the pressing member 6 are laminated on both ends on the rear glass plate lid side. Other configurations are the same as those of the backlight device shown in FIGS. 8a and 8b.

[0061] According to the backlight device of this embodiment, since the rear glass plate l id side has a light emitting surface formed in a corrugated shape as shown in FIG. Increases the diffusivity of the emitted light. For this reason, the uniformity of the luminance distribution is increased as compared with the case where a flat glass such as the front glass plate 11c is used as the light emitting surface. In this embodiment, the distance between the rear glass plate id and the optical surface member 7 can be shortened, and the backlight device can be made thinner.

[Example 8]

FIG. 11 is a cross-sectional view showing the main configuration of the backlight device according to the eighth embodiment of the present invention. In this figure, components that are the same as or correspond to the components shown in FIGS. 8a and 8b are assigned the same reference numerals, and detailed descriptions thereof are omitted.

[0063] In the backlight device shown in the eighth embodiment, the flat fluorescent lamp 4a housed in the housing 2 is similar to the backlight device in the seventh embodiment shown in FIG. The rear glass plate l id side is disposed on the opening 2 a side of the housing 2. However, the external electrode 3, the power supply member 5 and the holding member 6 are laminated in this order on both ends of the front glass plate 1lc side, and the lamp and the holding member 17 made of an elastic member are arranged on the rear glass plate 1 Id side. This is different from the backlight device in the seventh embodiment. The optical surface member 7 is disposed on the upper surface of the lamp and the pressing member 17 and is fixed by the frame body 8 from above. The other configuration is almost the same as the backlight device shown in FIG.

According to this embodiment, as in the seventh embodiment, the diffusibility of the emitted light is increased and the thickness can be reduced, and the reliability of the contact between the external electrode 3 and the power supply member 5 due to the weight of the lamp. There is an effect of increasing the nature.

Although the present invention has been described with reference to various embodiments, the present invention is not limited to the above embodiments, and can be embodied by modifying the constituent elements without departing from the gist of the present invention. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

Claims

The scope of the claims

[1] A bottomed housing having an opening, a flat fluorescent lamp housed in the housing, an external electrode provided in the flat fluorescent lamp, and supplying power to the external electrode A power supply member arranged in contact, a pressing member that presses the power supply member against the external electrode, an optical surface member disposed above the pressing member, and the power supply member and the presser from above the optical surface member A frame-like frame body fixed to the housing so as to press and hold the member,

The backlight device, wherein the external electrode and the power supply member are in contact with each other by a pressing force of the pressing member to ensure electrical continuity.

2. The backlight device according to claim 1, wherein a contact surface of the power supply member with the external electrode is formed in an uneven shape.

3. The backlight device according to claim 2, wherein the pressing member has elasticity, and the power feeding member and the external electrode are brought into contact with each other by the elastic force.

4. The backlight device according to claim 2, wherein the pressing member is formed with a recess that fits into the power feeding member.

5. The backlight device according to claim 2, wherein the pressing member is formed with an inclined portion that enlarges the opening of the housing, and the inclined portion has light reflectivity.

6. The backlight device according to claim 3, wherein the pressing member is an arch-shaped elastic insulating member fixed to the casing with a screw.

[7] The flat fluorescent lamp includes a flat front glass plate, a corrugated rear glass plate disposed opposite to the front glass plate, and a peripheral portion hermetically bonded to the peripheral portion of the front glass plate; It is composed of a discharge medium enclosed in a sealed container formed by these front glass plate and rear glass plate, and the external electrode is formed in a direction orthogonal to the corrugated shape of the rear glass plate. The backlight device according to claim 1.

[8] The casing has a stepped portion on which the peripheral portion of the rear glass plate is placed, and the external electrode and the power feeding member are in contact with each other by the pressing force of the stepped portion and the pressing member. 8. The backlight device according to claim 7, wherein electrical continuity is ensured.

[9] In the flat fluorescent lamp, the rear glass plate faces the opening side of the housing. The backlight device according to claim 7, wherein the backlight device is arranged.