KR20070031910A - Flat type discharge lamp and lighting device - Google Patents

Abstract

According to the present invention, the front substrate 1 and the rear substrate 2, which are made of a light-transmissive glass plate, are disposed to face each other at approximately regular intervals, and the periphery of the two glass plates is moved to the frit glass 4 through the side walls 3. It adhere | attaches and forms the planar discharge container. Phosphor layers 5a and 5b are formed inside the front substrate 1 and the back substrate 2, and the ultraviolet rays emitted from the discharge medium by the discharge are converted into visible light. On the outer surface of the back substrate 2, an external electrode 6 for applying a high voltage and an external electrode 7 for applying a low voltage are alternately arranged. A plurality of elongated spacers 8 are arranged at regular intervals between the front substrate 1 and the back substrate 2, and the gap between the front substrate 1 and the back substrate 2 is kept constant. At the same time, damage caused by the expansion of the lamp due to the pressure difference in and out of the discharge vessel is prevented. It arrange | positions so that a linear spacer 8 may exist within the maximum width of the external electrode 6, and one electrode 6 is divided into two in appearance. One electrode 6 is exposed to each of the discharge spaces divided by the linear spacer 8, and acts as the electrode 10 of each discharge space, thereby lighting each discharge space stably.

Front substrate, back substrate, sidewall, frit glass, phosphor layer, electrode

Description

Flat type discharge lamp and lighting device {FLAT TYPE DISCHARGE LAMP AND LIGHTING DEVICE}

The present invention relates to a planar discharge lamp and a lighting device.

In recent years, with the enlargement of the liquid crystal monitor, as a fluorescent lamp used for a backlight light source, the flat type discharge lamp in which the discharge space was formed in the flat-type closed glass container has been developed. In the flat discharge lamp, a fluorescent film is formed on the inner surface of a glass container, and a discharge medium made of a mixed gas of rare gases such as xenon, neon, and argon, or a mixed gas of these and mercury vapor is enclosed in the flat discharge space. On the upper and lower outer surfaces of the flat glass container, a plurality of stripe discharge electrodes parallel to each other are formed.

The necessary electric potential difference is provided between the adjacent discharge electrodes formed in the outer surface of a glass container, and discharge generate | occur | produces in the whole discharge space. By this discharge, the fluorescent film is excited and emitted by ultraviolet rays generated from xenon (see Japanese Utility Model Registration No. 3015262).

By the way, such planar discharge lamps are required to be large in area and thin in size as the liquid crystal monitor is enlarged. However, in a large area, a thin glass container is likely to be damaged by atmospheric pressure. For this reason, the planar discharge lamp which provided the spacer between the front substrate and back substrate which comprises a flat glass container is also known (refer Unexamined-Japanese-Patent No. 2003-45376).

In this prior art, a discharge electrode is formed in the outer surface of the back substrate which comprises a glass container. In order to ensure uniformity of light emission, each electrode is divided into two parts along the longitudinal direction and constituted by parallel stripe electrode pairs. The spacer provided between the front substrate and the rear substrate is disposed between these electrode pairs.

In a conventional planar discharge lamp constructed as described above, the stripe electrode is formed by screen printing a conductive paste. However, when the width of the electrode is narrowed, the screen plate during printing of the conductive paste is clogged, and it is difficult to form the electrode width constantly. For this reason, disconnection is caused in the part with narrow electrode width, and it becomes a cause which lowers the quality of a lamp. In addition, as the length of the electrode increases with the increase in the size of the lamp, the voltage value applied at the power feeding portion decreases due to the resistance loss of the electrode as it moves away from the power feeding portion, and the voltage is insufficient at the tip of the lamp. As a result, the brightness of the lamp decreases as it moves away from the power supply part, and a problem arises that uniform light emission cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to obtain a flat discharge lamp which can improve reliability during lighting and at the same time achieve high luminance.

A planar discharge lamp according to an embodiment of the present invention includes a planar discharge container in which a transmissive front substrate and a back substrate are disposed to face each other, and hermetically sealed therein, a discharge medium enclosed in the planar discharge container, A spacer arranged substantially parallel to the gap between the rear substrate and the rear substrate, the spacer forming a plurality of elongated discharge spaces, and provided on the inner wall or the outer wall of the rear substrate so as not to contact the discharge medium, and being formed along the spacer. The external electrode has a long external electrode, and the external electrode is alternately disposed between the electrode to which the high voltage is applied and the electrode to which the low voltage is applied, the longitudinal direction of the external electrode and the longitudinal direction of the spacer is substantially parallel, and the spacer and the Bonding surface with the rear substrate is disposed so as to be located within the maximum width of the external electrode The.

In addition, in the planar discharge lamp according to the embodiment of the present invention, the planar discharge container is characterized in that it is made of a transparent glass.

In the planar discharge lamp according to an embodiment of the present invention, the spacer is made of light-transmissive glass.

In addition, in the planar discharge lamp according to the embodiment of the present invention, the external electrode is a band type, and the part of the band type external electrode overlaps each of the discharge spaces formed on both sides of the spacer, It is characterized by having the maximum width which forms a discharge electrode.

In the planar discharge lamp according to an embodiment of the present invention, a sine wave high frequency voltage or a high frequency pulse voltage is applied between the external electrode to which the high voltage is applied and the external electrode to which the low voltage is applied. will be.

In addition, in the planar discharge lamp according to an embodiment of the present invention, the spacer has a square, rectangular, trapezoidal, trapezoidal, trapezoidal, cylindrical, cylindrical, triangular, inverted triangle, It is characterized by being convex or concave.

In the planar discharge lamp according to an embodiment of the present invention, the spacer may be a linear, rectangular, sinusoidal, triangular, or rectangular wave shape in which the apparent shape observed from the rear substrate side is continuous. It is.

In addition, in the planar discharge lamp according to the embodiment of the present invention, the external electrode meanders in a sinusoidal wave shape, a triangular wave shape, or a rectangular wave shape, but a part of each of the discharge spaces formed on both sides of the spacer is different. By overlapping, it has the largest width which forms a discharge electrode, It is characterized by the above-mentioned.

In the planar discharge lamp according to an embodiment of the present invention, the spacer is a light-transmissive hollow cylinder, a discharge medium is sealed in the hollow portion, and external electrodes are provided at both ends thereof. .

In addition, in the planar discharge lamp according to an embodiment of the present invention, the spacer is characterized in that the cross section is cylindrical or angular.

In addition, in the planar discharge lamp according to an embodiment of the present invention, the spacer is characterized in that formed integrally with the front substrate.

In addition, in the planar discharge lamp according to the embodiment of the present invention, the front substrate is formed in a concave-convex shape or a wavy shape, and the convex portions thereof are joined to the back substrate, whereby a plurality of the inside of the planar discharge container Discharge spaces.

Further, in the planar discharge lamp according to the embodiment of the present invention, the joining surface of the convex portion and the back substrate is formed along the external electrode and is disposed within their maximum width. .

In addition, the lighting apparatus according to the embodiment of the present invention is characterized by including any one of the planar discharge lamp as a light source.

According to the embodiment of the present invention configured as described above, one outer electrode is divided by the linear spacer by arranging a bonding surface between the linear spacer and the back substrate within the maximum width of the outer electrode at the center of the lamp. Since each of the discharge spaces is exposed to each other and can act as an electrode of each discharge space, each discharge space can be stably discharged, so that stable light emission of the entire screen, which was difficult in the form of one electrode, is possible. .

In addition, according to the embodiment of the present invention, it becomes possible to emit the spacer portion for preventing the damage of the planar discharge vessel due to atmospheric pressure, and the light emitting portion of the planar discharge lamp can emit light uniformly without luminance variation.

Further, according to the embodiment of the present invention, since it is not necessary to thinly form the external electrode by dividing the electrode into two, the ease of formation of the external electrode during manufacture is improved.

In addition, according to the embodiment of the present invention, since the external electrode can be formed wide, the resistance value of the external electrode is lowered, so that the heat loss in the external electrode can be reduced, and as a result, it is used as the backlight with the enlargement of the screen. Even when the length of the external electrode of the planar discharge lamp is long, a drop in voltage caused by moving away from the power supply portion can be suppressed, and light can be stably emitted to the tip of the lamp facing the power supply portion.

1 is a perspective view of a planar discharge lamp of a first embodiment of the present invention;

Fig. 2 is a cross sectional view of an electrode used in a first embodiment of the present invention, the electrode having convex portions provided on its side;

Fig. 3 is a cross-sectional view of a strip-shaped electrode in which the thickness of the center portion is narrowed, which is an electrode used in the first embodiment of the present invention.

Fig. 4 is a cross-sectional view of an electrode used in the first embodiment of the present invention and having a triangular wave shape electrode.

Fig. 5 is a perspective view in which a part of the planar discharge lamp using a spacer having a trapezoidal cross section is omitted in the first embodiment of the present invention.

Fig. 6 is a perspective view in which a part of the planar discharge lamp using a spacer having an inverted trapezoidal cross section is omitted in the first embodiment of the present invention.

Fig. 7 is a perspective view in which a part of the planar discharge lamp using a spacer having a triangular cross section is omitted in the first embodiment of the present invention.

Fig. 8 is a perspective view in which a part of the planar discharge lamp using a spacer having an inverted triangular cross section is omitted in the first embodiment of the present invention.

Fig. 9 is a perspective view in which a part of the planar discharge lamp using a spacer having a circular cross section is omitted in the first embodiment of the invention.

Fig. 10 is a perspective view in which a part of the planar discharge lamp using a spacer having a hollow circular cross section is omitted in the first embodiment of the present invention.

Fig. 11 is a cross sectional view parallel to the longitudinal direction of a spacer having a straight bottom shape used in the first embodiment of the present invention.

Fig. 12 is a cross sectional view parallel to the longitudinal direction of a spacer having a wavy bottom surface used in the first embodiment of the present invention.

Fig. 13 is a cross sectional view parallel to the longitudinal direction of the spacer in which the bottom shape used in the first embodiment of the present invention is a rectangular wave shape;

Fig. 14 is a cross sectional view parallel to the longitudinal direction of a spacer in which the bottom surface shape used in the first embodiment of the present invention is a single line;

Fig. 15 is a perspective view of the planar discharge lamp of the second embodiment of the present invention.

Figure 16 is a top view of a planar discharge lamp of a second embodiment of the present invention.

Fig. 17 is a sectional view of a planar discharge lamp of a second embodiment of the present invention.

FIG. 18 is a cross-sectional view taken along a line A-A 'in FIG. 16; FIG.

Fig. 19 is a perspective view seen from the back side of the planar discharge lamp of the third embodiment of the present invention.

Fig. 20 is a perspective view seen from the front face side of the planar discharge lamp of the third embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described in detail based on drawing.

(First embodiment)

1 is a perspective view showing a planar discharge lamp of a first embodiment of the present invention.

The front substrate 1 and the back substrate 2, which are made of a transparent glass plate, are disposed to face each other at approximately regular intervals, and the periphery of the two glass plates is adhered to the frit glass 4 through the side walls 3 to form a planar shape. The discharge vessel of is formed. In addition, the planar container may have a structure in which any one of the glass substrates is formed into a tray, and the sidewall is omitted, or a structure in which the periphery of the glass substrate is melted and adhered to glass without using frit glass.

Inside the planar discharge vessel, mercury vapor, xenon, krypton, argon, neon, and helium, alone or as a mixture of two or more kinds, are encapsulated at an encapsulation pressure of several kPa to several hundred kPa as a discharge medium.

Phosphor layers 5a and 5b are formed inside the front substrate 1 and the back substrate 2, and when ultraviolet rays emitted from the discharge medium by the discharge are irradiated onto the phosphor layers 5a and 5b, they are converted into visible light. do. Phosphors are of the same kind as those used in general lighting, cold cathode fluorescent lamps, and PDPs, and may be applied alone, or a mixture of several kinds of phosphors having different emission colors is applied to form phosphor layers 5a and 5b. have. In addition, you may apply | coat a fluorescent substance of other luminescent color separately in stripe form or dot form.

The phosphor layer 5a of the front substrate 1 on the side from which light is taken out, for example, has a mean particle diameter (primary particle diameter) of about 2.5 μm or more in order to transmit the light of the phosphor without loss. It is thinly formed with a thickness of 5 µm to 15 µm. On the other hand, the phosphor layer 5b of the back substrate 2, which does not extract light, induces most of the light toward the front substrate 1 side. For example, a phosphor particle having an average particle diameter of about 2.5 μm or less is formed by a thickness of 30. It is formed thick with a thickness of 100 micrometers-100 micrometers, and the reflectance is made high. As a result, most of the visible light generated by the phosphor layer 5b is directed to the front substrate 1 side. Further, a reflective layer of fine metal oxide may be formed between the back substrate 2 and the phosphor layer 5b. In addition, although the fluorescent substance layers 5a and 5b are formed in the inner surface of both glass substrates 1 and 2 in a figure, either fluorescent substance layer can also be abbreviate | omitted. In addition, the phosphor layers 5a and 5b of both the front substrate 1 and the rear substrate 2 may be omitted and used as a discharge lamp using ultraviolet or visible light emitted from a discharge medium.

On the outer surface of the back substrate 2, an external electrode 6 for applying a high voltage and an external electrode 7 for applying a low voltage are alternately arranged. The shape of the external electrodes 6 and 7 is formed in strip shape as shown. However, this shape is not limited to a band shape, for example, a shape in which convex portions are provided on the side surfaces as shown in the electrode 10 of FIG. 2, or a band shape in which the thickness of the center portion is narrowed as shown in FIG. Alternatively, as shown in Fig. 4, it can be made into various shapes such as triangular wave shape. However, the shape of these electrodes is formed in the substantially strip | belt shape of largest width L in the longitudinal direction. In these drawings, reference numeral 8 'indicates a spacer provided in the maximum width L of these electrodes as described below.

As shown in Fig. 1, a plurality of elongated plate-shaped spacers 8 are arranged at regular intervals between the front substrate 1 and the back substrate 2, and the front substrate 1 and the back substrate are arranged. While maintaining the space | interval of (2) constant, damage by the width shrinkage of the lamp by the pressure difference of inside and outside of a discharge container is prevented. These plurality of spacers 8 are made of, for example, transparent glass, and the discharge vessel is divided to form a plurality of thin and long discharge spaces.

In the center part of the outer surface of the back substrate 2, strip | belt-shaped outer surface electrodes 6 and 7 are provided in substantially parallel. Among these outer surface electrodes, the electrode widths of the outer electrodes 7 'and 7' provided at both ends of the rear substrate 2 are formed to be approximately half the width of each of the outer surface electrodes 6 and 7 in the center portion. have. Thereby, the electrode width in the some discharge space divided by the spacer 8 becomes substantially equal at the center part and both ends.

In the planar discharge lamp of the above-described configuration, a high frequency sine wave voltage or a high frequency pulse voltage having a frequency of 10 Hz to 200 Hz is applied between the external electrode 6 on the high voltage side and the external electrodes 7 and 7 'on the low voltage side. When applied in accordance with E), discharge occurs in each discharge space formed by the elongated plate-shaped spacer 8 in the planar discharge vessel. Ultraviolet rays emitted from the discharge medium are converted into visible light by the phosphor layers 5a and 5b and used as the illumination device 100. The pulse voltage waveform applied by the power supply E may be a rectangular wave voltage, a triangular wave voltage, or the like.

The cross-sectional shape of the spacer 8 is a trapezoidal shape as shown in Figs. 5 and 6, a triangle as shown in Figs. 7 and 8, as shown in Figs. Various shapes, such as the same circular shape and the tube as shown in FIG. 10, can be employ | adopted.

In addition, the bottom surface shape of the spacer 8 seen from the back substrate 2 side, that is, the shape of the joining surface of the spacer 8 and the back substrate 2, has a linear stripe shape as shown in FIG. It is formed as a continuous band as a whole, such as a wavy wave as shown in 12 and a rectangular wave as shown in FIG. However, the bottom surface of the spacer 8 may have a discontinuous band shape as shown in FIG. In either configuration, the spacer 8 and the rear substrate 2 are substantially parallel to the longitudinal direction of the bonding surface between the spacer 8 and the rear substrate 2 and the longitudinal directions of the electrodes 6 and 7. ) And the bonding surface is arranged to exist within the maximum width L of each electrode. As a result, a part of the width direction overlaps each of the discharge spaces divided by the linear spacers 8, and the external electrodes 6 and 7 can act as electrodes of the respective discharge spaces.

(2nd Example)

15 to 17 show a perspective view, a top view, and a cross-sectional view, respectively, of the planar discharge lamp 20 of the second embodiment of the present invention. 18 is a cross-sectional view along the line A-A 'in FIG. The spacer 8 provided between the front board | substrate 1 and the back board | substrate 2 in order to prevent the expansion by atmospheric pressure is formed by the hollow cylinder like a cylinder or a square cylinder shape. By the front substrate 1, the back substrate 2, and the side wall 3 (not shown, but formed on four sides of the front substrate 1 and the back substrate 2), the inside of the discharge vessel is kept airtight. In this case, at least mercury or at least one rare gas is enclosed as a discharge medium.

In addition, the inside of the hollow spacer 8 is also kept airtight, and similarly mercury or one or more rare gases are enclosed. Here, the rare gas in the discharge vessel and the inside of the spacer 8 may not necessarily be the same. As shown in Fig. 18, the phosphor layer 9 is coated and formed on the inner circumferential surfaces of the front substrate 1, back substrate 2, and spacer 8. In this embodiment, a pair of electrodes 10 and 10 are provided at both ends of the front substrate 1. These pairs of electrodes 10 and 10 are formed at both ends in the longitudinal direction of the spacer 8 of the front substrate 1. In addition, this pair of electrodes 10 and 10 may be provided in the back board | substrate 2, or may be provided in both the front board | substrate 1 and the back board | substrate 2. As shown in FIG. The electrodes 10 and 10 provided on the front substrate 1 or the rear substrate 2 and the electrodes provided on the spacer 8 are integrated, and the light emitting portion and the spacer 8 of the front substrate 1 are integrated. The light emitting portion can be lit by the same power supply.

In the planar discharge lamp 20 according to the embodiment of the present invention, the light emitting portion of the discharge vessel and the spacer 8 provided for preventing shrinkage can be made to emit light simultaneously, and the entire light emitting surface can be made to emit light uniformly.

(Third Embodiment)

19 and 20 are perspective views showing the planar discharge lamp 20 of the third embodiment of the present invention, wherein the planar discharge lamp 20 is viewed from the back substrate 2 side and the front substrate 1 side, respectively. to be.

In the present embodiment, the front substrate 1 composed of the transparent glass plate is molded so that the cross section is uneven by thermoforming, and the convex portion 1b is formed on the rear substrate 2 composed of the transparent glass plate in the same manner. It presses and functions as a spacer. That is, the front substrate 1 forms a plurality of elongated discharge spaces between the rear substrate 2 by the groove-shaped recesses. On the outer surface of the back substrate 2, elongated strip-shaped external electrodes 6 and 7 are formed. The bonding surface between the convex portion 1b of the front substrate 1 and the rear substrate 2 is configured to be located within the maximum electrode width L of the external electrodes 6, 7 as in the first embodiment. It is. The phosphor layers 5a and 5b are applied to the gap between the front substrate 1 and the back substrate 2.

According to the planar discharge lamp 20 having such a configuration, since the front substrate 1 is thermoformed, since the front substrate 1 and the spacer are integrally formed, the manufacturing cost can be reduced.

Claims (14)

The transmissive front substrate and the rear substrate are disposed to face each other, and the inside of the planar discharge container sealed hermetically, the discharge medium enclosed in the planar discharge container, and substantially parallel to the gap between the front substrate and the back substrate. An external electrode arranged in the planar discharge container, the spacer having a plurality of discharge spaces, and an elongated external electrode formed on the inner wall or the outer wall of the rear substrate so as not to contact the discharge medium and formed along the spacer; The electrode to which the high voltage is applied and the electrode to which the low voltage is applied are alternately arranged, and the longitudinal direction of the said external electrode and the longitudinal direction of the said spacer are substantially parallel, and the joining surface of the said spacer and the said back substrate is said external Planar discharge lamp, characterized in that disposed to be within the maximum width of the electrode. The planar discharge lamp of claim 1, wherein the planar discharge container is made of light-transmissive glass. The planar discharge lamp of claim 2, wherein the spacer is made of light-transparent glass. The external electrode of claim 3, wherein the external electrode is band-shaped, and the band-shaped external electrode has a maximum width for forming the discharge electrode by overlapping a part of each of the discharge spaces formed on both sides of the spacer. Flat discharge lamp characterized in that. The planar discharge lamp of claim 4, wherein a sine wave high frequency voltage or a high frequency pulse voltage is applied between the external electrode to which the high voltage is applied and the external electrode to which the low voltage is applied. The planar discharge lamp according to claim 1, wherein the spacer has a square, rectangular, trapezoidal, inverted trapezoidal, tubular, cylindrical, triangular, inverted triangular, convex or concave shape. . The planar discharge lamp according to claim 2, wherein the spacer has a continuous linear, rectangular, sinusoidal, triangular, or rectangular wave shape observed from the rear substrate side. The external electrode is meandering in a sine wave shape, a triangular wave shape, or a rectangular wave shape, but a part of the external electrode overlaps each of the discharge spaces formed on both sides of the spacer, thereby forming a discharge electrode. A flat discharge lamp having a width. The planar discharge lamp according to claim 1, wherein the spacer is a transparent hollow cylinder, and a discharge medium is sealed in the hollow portion, and external electrodes are provided at both ends thereof. 10. The planar discharge lamp as claimed in claim 9, wherein the spacer has a cylindrical or angular cross section. The planar discharge lamp of claim 1, wherein the spacer is integrally formed with the front substrate. 12. The planar type according to claim 11, wherein the front substrate is formed in an uneven or wavy shape, and the convex portions are joined to the rear substrate to form a plurality of discharge spaces in the planar discharge container. Discharge lamp. 13. The planar discharge lamp according to claim 12, wherein a joining surface of the convex portion and the back substrate is formed along the external electrode and is disposed within their maximum width. An illumination device comprising the planar discharge lamp according to any one of claims 1 to 8 as a light source.

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