JP2008538853A - Flat fluorescent lamp and electrode structure of the fluorescent lamp - Google Patents

Abstract

The present invention relates to a flat fluorescent lamp filled with a gas and hermetically sealed electrode and its electrode structure. The fluorescent lamp includes a front plate 110 coated with a phosphor 111; a reflecting plate 140; a conductive plate electrically insulated from each other and printed. The first and second electrode parts 150 and 160, the dielectric layer 170, and the phosphor 180 are sequentially provided; the rear plate 120; supports between the front plate 110 and the rear plate 120 to form a discharge space. It is comprised from the support part 130; The first electrode unit 150 includes a plurality of strip-type first electrodes 151 positioned parallel to each other in the discharge space, and a first lead electrode 152 positioned outside the discharge space so that the plurality of first electrodes are joined. . The second electrode unit 160 includes a plurality of strip-type second electrodes 161 positioned in parallel one by one between the first electrodes 151, and a second lead positioned outside the discharge space so that the plurality of second electrodes are joined. It consists of an electrode 162. It is possible to stabilize the discharge, make the luminance distribution uniform, and minimize the thickness of the fluorescent lamp panel.
[Selection] Figure 1

Description

  The present invention relates to a flat fluorescent lamp and an electrode structure of the fluorescent lamp. More specifically, the present invention relates to a flat fluorescent lamp capable of minimizing the thickness of the lamp and improving the luminance uniformity and the electrode structure thereof. Is.

As a conventional technique related to a flat fluorescent lamp, a flat fluorescent lamp having a counter electrode arrangement and a surface discharge flat fluorescent lamp having a linear electrode arranged on one side are disclosed. Moreover, as a commercially available flat fluorescent lamp, dielectric barrier discharge (dielectric) of Osram, Germany.
There is a flat fluorescent lamp using a barrier discharge).

  Hereinafter, a conventional flat fluorescent lamp will be described with reference to FIGS.

  The fluorescent lamp of FIG. 16 includes a support frame 30 so that a discharge space is formed between the front glass substrate 10 and the rear glass substrate 20, and the discharge space is filled with an inert gas.

  The front glass substrate 10 is coated with a phosphor layer 11 on the lower surface.

  The rear glass substrate 20 is provided with an electrode 21 provided with protrusions for partial discharge, a dielectric layer 22 for electrically insulating the electrode 21 to lower the discharge start voltage, and a phosphor layer 23 in this order. Laminated.

  FIG. 17 is a diagram showing a planar structure of electrodes provided in the fluorescent lamp of FIG. The electrode 21 includes an anode 21a and a cathode 21b, and is driven by a DC impulse method.

  The anode 21a and the cathode 21b are each composed of a plurality of strip leads, and in particular, the anode 21a is a pair, and the strip lead of one cathode 21b is located closest to the pair of anodes 21a. A plurality of needle-like projections for partial discharge are formed on the strip lead of the cathode 21b.

  In such a conventional flat fluorescent lamp, when a DC impulse is applied to the anode 21a and the cathode 21b, a delta-shaped partial discharge is generated between the strip lead of the anode 21a and the protrusion P of the strip lead of the cathode 21b. And ultraviolet rays are emitted.

  However, such a conventional flat fluorescent lamp has an asymmetric structure because the anode composed of a pair of strip leads and the cathode composed of a single strip lead with a plurality of protrusions projecting from each other. Due to the simple electrode structure, there is a problem that the luminance uniformity is lowered.

  In particular, there is a problem that the luminance uniformity decreases due to the luminance difference generated from the partial discharge of the needle-like protrusions.

  The present invention has been made to solve the above-described drawbacks. In the electrode structure of the flat fluorescent lamp, the present invention solves the luminance difference due to partial discharge at the needle-like protrusions, and achieves stable discharge and uniform luminance distribution. It is an object of the present invention to provide a flat fluorescent lamp having a discharge tube structure capable of minimizing the thickness of the fluorescent lamp panel.

  According to one aspect of the present invention, the electrode structure of the flat fluorescent lamp of the present invention has a flat discharge tube filled with gas and having a certain thickness, and a conductive material printed in the discharge tube. In a flat fluorescent lamp including an electrode portion, a dielectric layer applied to the electrode portion and the discharge tube, and a phosphor applied to the dielectric layer, the electrode portion is disposed inside the discharge tube. It consists of a plurality of strip-type electrodes arranged uniformly in parallel to each other on one plane, and is achieved by applying power supplies of opposite polarities to the closest strip electrodes during discharge.

  According to another aspect of the present invention, the electrode structure of the flat fluorescent lamp according to the present invention includes a flat discharge tube filled with gas and having a certain thickness, and a conductive electrode printed in the discharge tube. In a flat fluorescent lamp comprising a portion, a dielectric layer applied to the electrode portion and the discharge tube, and a phosphor applied to a part of the dielectric layer, the electrode portion has a parallel discharge At least two parallel strips form a group in the tube, and are composed of a plurality of strip electrodes arranged uniformly on one plane inside the discharge tube. Power supplies of opposite polarities are applied to the nearest strip electrode group Can be achieved.

  According to still another aspect of the present invention, the electrode structure of the flat fluorescent lamp of the present invention includes a flat discharge tube filled with gas and having a certain thickness, and a conductive material printed in the discharge tube. In a flat fluorescent lamp including an electrode portion, a dielectric layer applied to the electrode portion and the discharge tube, and a phosphor applied to the dielectric layer, the electrode portion is disposed inside the discharge tube. The strip-type electrode is formed of a plurality of strip-type electrodes which are uniformly arranged in parallel to each other on a single plane. Can be achieved by applying power supplies of opposite polarities to each other.

  According to still another aspect of the present invention, the flat fluorescent lamp of the present invention is a flat fluorescent lamp filled with gas and sealed, and a front plate coated with a phosphor; a reflector; A rear plate comprising, in order, electrically conductive first and second electrode portions, a dielectric layer, and a phosphor printed so as to be electrically insulated; and supports and seals between the front plate and the rear plate And a plurality of strip-type first electrodes positioned in parallel with each other in the discharge space, and the plurality of first electrodes are joined to each other. A first lead electrode positioned outside the discharge space, and the second electrode portion includes a plurality of strip-type second electrodes positioned in parallel one by one between the first electrodes, The second lead electrode positioned outside the discharge space so that the second electrode of the second electrode is joined It is accomplished by having and.

  According to still another aspect of the present invention, the flat fluorescent lamp of the present invention is a flat fluorescent lamp filled with gas and sealed, and a front plate coated with a phosphor; a reflector; A rear plate comprising, in order, electrically conductive first and second electrode portions, a dielectric layer, and a phosphor printed so as to be electrically insulated; and supports and seals between the front plate and the rear plate A plurality of strip type first electrodes in which at least two parallel strips are arranged in parallel in the discharge space in a group. And a first lead electrode positioned outside the discharge space so that the plurality of first electrodes are joined, and the second electrode portion is symmetric with the group of the strip-type first electrodes. The corresponding number of strips are arranged in parallel as a group. A plurality of strip-shaped second electrodes that can be achieved by the plurality of second electrodes and a second lead electrode which is located outside of the discharge space so as to be bonded.

  According to the flat fluorescent lamp of the present invention as described above, the strip-type electrodes are made to be 1: 1 symmetrical, or two or more strip-type electrodes are made symmetrical while forming a group. By disposing in the discharge tube, in the conventional electrode structure, the luminance difference due to partial discharge at the needle-like protrusion is eliminated, it has a stable discharge and uniform luminance distribution, and further minimizes the thickness of the fluorescent lamp panel There is an effect that can.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the flat fluorescent lamp according to the present embodiment includes a front plate 110 and a rear plate 120 made of a glass substrate, and a support portion 130 that supports the front plate 110 and the rear plate 120. A discharge space is formed.

  The discharge tube composed of the front plate 110, the rear plate 120, and the support portion 130 is filled with an inert gas. As a specific example, xenon (Xe) gas or xenon (Xe) gas containing neon (Ne), argon (Ar) or krypton (Kr) can be charged, and preferably does not contain mercury. To.

  A phosphor 111 is applied to the lower surface of the front plate 110, and the front plate 110 becomes a light output surface of light generated by the fluorescent lamp.

  The rear plate 120 includes a reflector 140, electrode portions 150 and 160 made of a plurality of strip-type electrodes, a dielectric layer 170, and a phosphor 180.

  The reflection plate 140 provided on the upper portion of the rear plate 120 reflects light in the direction of the light exit surface to improve light use efficiency, and adjusts the amount of reflection of the entire incident light so that the entire light exit surface of the backlight has a uniform brightness. Have a distribution.

  The dielectric layer 170 electrically insulates the electrode parts 150 and 160 to limit the current.

  A phosphor 180 is applied on the upper surface of the dielectric layer 170.

On the other hand, in the embodiment of the present invention, a discharge space is configured by providing a support portion 130 at the periphery between the front plate 110 and the rear plate 120. However, it is not necessary to provide separate support portions for the front plate and the rear plate.
It is also possible to form a discharge space by joining the glass peripheral portions of the front plate and the rear plate by glass. In this case, a plurality of spacers are arranged in the space between the front plate and the rear plate, so that the front plate and the rear plate maintain a constant gap, and the phosphor has a phosphor in order to increase luminous efficiency. Can be applied.

  As described above, there is an advantage that the fluorescent lamp panel can be thinned by securing the discharge space by the discharge method without using a separate support portion.

  In the flat fluorescent lamp of the present invention, the electrode section is composed of a plurality of strip-type electrodes arranged uniformly in parallel with each other on one plane inside the discharge tube. A technical feature is that power of opposite polarity is applied.

  In the present invention, the paste constituting the electrode part has a small work function, is resistant to ion bombardment, is excellent in conductivity, is easy to adsorb a dielectric material, and has a special function such as activation treatment or aging. The thing which does not require an after-treatment process is preferable. As such an electrode material, a conductive paste such as silver (Ag), nickel (Ni), or copper (Cu) can be used.

  Such a flat fluorescent lamp of the present invention is driven by a rectangular wave AC pulse power supply.

  In the present invention, since the polarity of the AC pulse power supply plays the same role, the polarities of the first electrode portion and the second electrode portion are not particularly distinguished.

  Specifically, FIG. 2 is a diagram showing a preferred example of a driving circuit for driving the flat fluorescent lamp of the present invention, and outputs a high-voltage rectangular wave AC pulse by combining four high-speed FETs and a transformer. To do.

  With a DC voltage (+ V) applied to the drains of Q1 and Q3, a rectangular wave AC pulse can be obtained by inputting an appropriate signal to the gate of each FET. Referring to FIG. 3a, when Q3 and Q4 are simultaneously “on”, a voltage of about “+ V” is generated across the primary side of the transformer, and Q1 and Q1 are simultaneously “on”. In this case, a voltage of about “−V” is generated across the primary side of the transformer.

  FIGS. 3A and 3B respectively show the gate input signal waveform and the output voltage waveform of the drive circuit of FIG. The output voltage generated on the primary side of the transformer is boosted and applied through the first electrode portion and the second electrode portion.

  FIG. 4 is a view showing a preferred embodiment of the planar structure of the electrodes in the flat fluorescent lamp of the present invention, and the electrode parts include a first electrode part 150 and a second electrode to which power supplies having opposite polarities are applied. Part 160.

  Specifically, the first electrode unit 150 includes a plurality of strip-type first electrodes 151 positioned in parallel with each other in the discharge space, and a first electrode positioned outside the discharge space so that the plurality of first electrodes are joined. And a lead electrode 152.

  The second electrode unit 160 includes a plurality of strip-type second electrodes 161 positioned in parallel one by one between the first electrodes, and a second positioned outside the discharge space so that the plurality of second electrodes are joined. The lead electrode 162 can be configured.

  On the other hand, reference numeral 130a in FIG. 4 represents a region where the support part 130 is fixed. The ends of the first electrode and the second electrode are extended to at least the part where the support part 130 is located, and the discharge space So that the end of the electrode is not exposed.

  As a result, the end of the strip-type electrode is located outside the discharge space. Therefore, since the end portion of the strip electrode does not affect the discharge generated in the discharge space, stable discharge characteristics can be obtained. That is, it is possible to prevent the end portion and the intermediate portion of the strip-type electrode from being discharged in other discharge modes, and to obtain the same luminance uniformity between the center and the peripheral portion of the lamp.

  As described in the prior art, conventionally, a plurality of needle-like protrusions are formed on the strip-shaped electrode so that the discharge positions are uniformly distributed between the electrodes. This is because the discharge starts at the tip of the acicular protrusion, the path of the discharge is predicted, and the acicular protrusion is appropriately distributed so as to achieve a uniform discharge between the electrodes. It is intended to obtain uniformity.

  However, the conventional electrode structure has a problem that the electric field is concentrated on the tip of the needle-like protrusion or the electrode, and the electric field is concentrated on the tip portion and the discharge becomes unstable as the electric field is particularly high. In addition, the conventional electrode structure having needle-like protrusions has a problem in that a shadow region in which luminance is partially lowered depending on the position of the needle-like protrusions is generated, resulting in a reduction in uniformity.

  On the other hand, in the conventional electrode structure having needle-like projections, when the tip is driven with a high electric field for a long time, the electrode damage is accelerated to shorten the product life, and the phosphor is deteriorated and the dielectric layer is damaged. This causes a problem that stable discharge cannot be performed.

  However, according to the electrode structure of the flat fluorescent lamp of the present invention, the configuration of the protruding portion where discharge starts is eliminated, and a linear shape in which a separate protrusion is not formed while forming a 1: 1 symmetry over the entire surface of the discharge tube. The strip type electrode is used. It has been confirmed that such an electrode structure of the present invention can remarkably increase the luminance uniformity as compared with a conventional electrode structure having needle-like protrusions that discharge only at a specific position of the electrode.

Specifically, FIG. 5 is a diagram showing an experimental example of luminance uniformity of the flat fluorescent lamp according to the present invention, and the luminance uniformity is measured by dividing the entire surface light source into nine equal parts. The numbers in parentheses represent the luminance [cd / m ² ] measured in each region.

The whole surface light source was divided into nine equal parts, and the luminance was measured in each of the areas A1 to A9. The average value of the luminance is 5831 cd / m ² , and it can be seen from the definition of the uniformity of the surface light source that the ratio of the highest region A5 to the lowest region A9 is 95%.

  FIG. 6 is a diagram showing the luminance uniformity of a conventional flat fluorescent lamp having an electrode structure with needle-like protrusions for comparison with the luminance uniformity of the flat fluorescent lamp of the present invention. Similarly to FIG. 5, the entire surface light source was divided into nine equal parts, and the luminance uniformity was investigated.

The whole surface light source was divided into nine equal parts, and the luminance was measured in each of the areas A1 to A9. The luminance average value of the conventional fluorescent lamp is 5593 cd / m ² , and it was confirmed by the definition of the uniformity of the surface light source that the ratio of the highest luminance region B5 to the lowest luminance region B9 is 88%.

  That is, if the present invention is compared with the prior art, the luminance uniformity of the conventional fluorescent lamp is 88%, but the luminance uniformity of the fluorescent lamp manufactured according to the present invention is 95%, which is a conventional needle shape. It was confirmed that the luminance uniformity was remarkably increased as compared with the electrode structure having protrusions.

  In the flat fluorescent lamp according to the present invention, the thickness of the first electrode and the second electrode is 5 to 15 μm, and the deviation in the thickness of each electrode is preferably ½ or less. It is produced to become.

  This is to prevent the electrode from being damaged due to a large difference in thickness between the middle and both sides of the electrode, and when both sides are too thin, the electric field concentrates on both sides. When manufacturing an electrode using a printing technique, it is possible to perform optimization within a range where stable discharge is possible in consideration of technical and economic aspects.

  Next, in the flat fluorescent lamp of the present invention, the technical feature is that the width of each electrode is 0.3 to 1 mm.

  As shown in FIG. 7, according to the embodiment of the present invention, when the electrode width is 0.3 mm or less, heat dissipation is easy, and when the electrode width is 1 mm or more, the peak value of the displacement current increases as the electrode width increases. The electrode area increases and the capacitance of the electrode increases. Therefore, even in the case of a discharge current, the larger the electrode width, the larger the current peak value and the longer the current sustaining time. Therefore, excessive current flow causes more reactive power that does not contribute to light emission. A point can be generated.

  In order to solve such problems, the applicant of the present invention measured the discharge efficiency characteristics with respect to the electrode width, and confirmed that it is preferable to determine the electrode width within a range of 0.3 to 1 mm. did.

  FIG. 8 is a graph showing the discharge efficiency characteristics depending on the electrode width, and it can be seen that the efficiency decreases when the electrode width is outside the range of 0.3 to 1 mm.

  In the present invention, a technical feature is that a distance between two adjacent electrodes is 3 to 10 mm.

  More specifically, the distance between the two electrodes must be considered together with the pressure in the discharge tube. Even if Paschen's law is taken into consideration, the pressure in the discharge tube depends on the distance between the electrodes. Must be adjusted.

  According to Paschen's law, the discharge start voltage (Vf) can be expressed as a function of the electrode interval (d) and the mean free path (λe), Vf = fd / λe.

  Since the mean free path (λe) is inversely proportional to the pressure (P), from Paschen's law, the discharge start voltage (Vf) is the electrode spacing (d) how many times the mean free path (λe). It can be expressed as one variable representing the same, and it is understood that the same discharge characteristic is represented if d / λe is the same.

  FIG. 9 is a graph showing the discharge start voltage and the efficiency characteristics according to the electrode spacing in the first embodiment of the present invention. As the electrode spacing increases, the discharge start voltage increases significantly. Only a small change is shown in comparison with the increase rate of the starting voltage.

  Next, FIG. 10 is a graph showing the relationship between pressure and luminance depending on the electrode spacing in the first embodiment of the present invention. The smaller the electrode spacing, the more gas can be charged in the discharge tube. When the electrode interval is wide and the gas pressure is high, it can be seen that the luminance tends to decrease greatly.

  Thus, in the embodiment of the present invention, in order to obtain high luminance with stable discharge characteristics, the distance between two adjacent electrodes is preferably 1 to 10 mm.

  In the flat fluorescent lamp of the present invention, a well-known diffusion sheet can be used to minimize the influence of the luminance difference between the micro discharge areas between the microelectrodes. The film can be considered to have the same function as the diffusion film.

  The flat fluorescent lamp of the present invention may further include a heat sink for easy heat generation. The heat radiating plate can be attached to the back surface of the rear plate, and a heat radiating sheet or silicon can be attached to make the heat conduction effective.

Second Embodiment
In general, the lamp efficiency is proportional to the luminance and inversely proportional to the power consumption. Therefore, in order to increase the lamp efficiency, it is necessary to reduce the power consumption and increase the luminance.

  On the other hand, in order to increase the brightness, it is preferable to increase the width of the electrode. However, as in the first embodiment, when only the width of the electrode is increased in one strip electrode structure, the brightness increases. In addition, since the power consumption increases, it is difficult to expect a large increase in lamp efficiency by increasing only the electrode width.

  Accordingly, in the second embodiment of the present invention, it is possible to provide a high-efficiency lamp by minimizing the area of the electrode and reducing the power consumption while increasing the luminance by setting the electrode width large. Features.

  Specifically, a second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  In the flat fluorescent lamp according to the second embodiment of the present invention, the configuration other than the electrode structure is the same as that of the first embodiment. Therefore, in the following description, those described in the first embodiment are omitted. The difference will be mainly described.

  The present invention relates to a flat fluorescent lamp in which at least two parallel strip-type electrodes form a group and are uniformly arranged on one plane of a discharge tube, and the nearest strip electrode group has power supplies of opposite polarities. In the following description, an electrode structure in which three strip electrodes form a group and have a 3: 3 symmetry will be described as a preferred example.

  As shown in FIG. 11, in the electrode structure of the flat fluorescent lamp according to the present invention, the electrode portions 210 and 220 are provided on the inner surface of the rear plate 200 and are made of a conductive material to which power supplies having opposite polarities are applied. It consists of a first electrode part 210 and a second electrode part 220.

  The first electrode unit 210 has a plurality of first electrodes 211 provided so that three strip-type electrodes positioned in parallel with each other in the discharge space form a group, and the plurality of first electrodes 211 are joined together. The first lead electrode 212 is located outside the discharge space.

  The second electrode unit 220 includes a plurality of second electrodes 221 provided in parallel so that three strip-type electrodes form a group between the group of first electrodes 211, and the plurality of second electrodes 221 are joined. And a second lead electrode 222 positioned outside the discharge space.

  Reference numeral 201 in FIG. 11 indicates a position where the support portion is fixed. The ends of the first electrode and the second electrode are extended to at least the portion 201 where the support portion is located, and the end of the electrode in the discharge space. Do not expose the part.

  Thereby, as described in the first embodiment, the end of the strip-type electrode is positioned outside the discharge space. Therefore, the end portion of the strip-type electrode does not affect the discharge made in the discharge space, so that stable discharge characteristics can be obtained.

  As described above, the three strip-type electrodes form a group and the electrodes of the first electrode portion and the second electrode portion are configured to be symmetric, thereby having a characteristic of reducing the impedance value and consuming Electric power can be lowered.

  At this time, each of the three strip-type electrodes may have the same width, but among the three electrodes, two electrode widths are made the same, while the remaining one electrode width is made larger or smaller. Is also possible.

  For example, as shown in FIG. 11, among the three electrodes forming a group, the width d2 of the electrodes 211a and 211c on both sides can be made wider than the width d1 of the electrode 211b.

  Also in the second embodiment of the present invention, as described in the first embodiment, it is preferable that the width of each electrode is manufactured in the range of 0.3 to 1 mm.

  Referring to FIG. 11, in the 3: 3 electrode, it is preferable that the overall width (D) of the three electrode portions is approximately 1 to 10 mm.

  FIG. 12 is a graph showing a current waveform by each electrode structure of the first embodiment and the second embodiment of the present invention, and is a current waveform measured under the same voltage condition. Compared to the electrode structure of the first embodiment having a 1: 1 symmetric structure, the same increase in voltage versus current can be confirmed in the electrode structure of the second embodiment having a 3: 3 symmetric structure. it can.

  FIG. 13 is a graph showing the luminance characteristics of the electrode structures of the first and second embodiments of the present invention. In the case of the electrode structure of the first embodiment having a 1: 1 symmetrical structure, the displacement current However, since the discharge current is small, the efficiency of the electrode structure of the second embodiment having a 3: 3 symmetrical structure under the same voltage condition is about 25% higher.

  That is, as in the second embodiment of the present invention, the electrode structure in which a plurality of strip-type electrodes are grouped brings about an increase in current at the same voltage as compared with one strip-type electrode, and the characteristics and thickness of the material. There is an effect of increasing the luminance without any change. In addition, it is possible to obtain an effect in which the increase in luminance is greater than the increase in power.

  On the other hand, FIG.14 and FIG.15 is a figure which shows other deformation | transformation embodiment in the electrode structure of this invention.

  When comparing the 3: 3 symmetric strip electrode structure described in the second embodiment with the 1: 1 symmetric strip electrode structure described in the first embodiment, the 3: 3 symmetric strip electrode structure is 1: It can be understood that the electrode configuration is the same as that in which one non-symmetrical strip-type electrode structure includes two symmetrical non-conductive regions.

  Therefore, by including an arbitrary non-conductive region inside the periphery of each strip electrode in the 1: 1 strip electrode structure, the impedance is maintained while maintaining the high luminance uniformity characteristic of the 1: 1 strip electrode. By reducing the power consumption, the power consumption can be reduced and the efficiency of the lamp can be increased. Further, since the decrease in the conductance of the electrodes can be expected, there is an advantage that the discharge current can be increased by reducing the displacement current even with the same distance between the electrodes.

  As described above, the non-conductive region formed inside the peripheral edge of each strip-type electrode can have various forms. For example, as shown in FIG. 14, two or more non-conductive regions (FIG. 14) can be formed inside the periphery of each strip electrode, or as shown in FIG. Conductive regions can also be formed.

1 is a partially cut perspective view of a flat fluorescent lamp according to the present invention. It is a figure which shows a preferable example of the drive circuit for driving the flat fluorescent lamp of this invention. FIG. 3 is a diagram illustrating waveforms of input / output signals of the drive circuit of FIG. 2. It is a figure which shows the electrode structure of the flat fluorescent lamp by preferable 1st Embodiment of this invention. 4 is a diagram illustrating an experimental example of luminance uniformity of the flat fluorescent lamp according to the first embodiment of the present invention. It is a figure which shows the brightness | luminance uniformity of the conventional flat fluorescent lamp for comparing with the brightness | luminance uniformity of the flat fluorescent lamp by 1st Embodiment of this invention. In 1st Embodiment of this invention, it is a graph which shows the current characteristic by electrode width. In 1st Embodiment of this invention, it is a graph which shows the efficiency characteristic by electrode width. In 1st Embodiment of this invention, it is a graph which shows the discharge start voltage and efficiency characteristic by electrode space | interval. In 1st Embodiment of this invention, it is a graph which shows the relationship between the pressure and brightness | luminance by electrode spacing. It is a figure which shows the electrode structure of the flat fluorescent lamp by 2nd Embodiment of this invention. It is a graph which shows the current waveform by each electrode structure of 1st Embodiment and 2nd Embodiment of this invention. It is a graph which shows the luminance characteristic by each electrode structure of 1st Embodiment and 2nd Embodiment of this invention. It is a figure which shows the further deformation | transformation embodiment of the electrode structure of this invention. It is a figure which shows the further deformation | transformation embodiment of the electrode structure of this invention. It is a cross-sectional block diagram of the conventional flat fluorescent lamp. It is a figure which shows the electrode structure of the conventional flat fluorescent lamp.

Claims (12)

In a flat fluorescent lamp filled with gas and sealed,
A front plate coated with a phosphor;
A back plate comprising in order a reflector, conductive first and second electrode parts printed to be electrically insulated from each other, a dielectric layer, and a phosphor;
A support for supporting between the front plate and the rear plate to form an airtight discharge space;
Consists of
The first electrode part is
A plurality of strip-type first electrodes positioned parallel to each other in the discharge space;
A first lead electrode positioned outside the discharge space such that the plurality of first electrodes are joined;
Have
The second electrode part is
A plurality of strip-type second electrodes positioned in parallel one by one between the first electrodes;
A second lead electrode positioned outside the discharge space such that the plurality of second electrodes are joined;
A flat fluorescent lamp characterized by comprising:   The flat fluorescent lamp of claim 1, wherein the first and second electrodes have a thickness of 5 to 15 µm.   The flat fluorescent lamp according to claim 1 or 2, wherein a thickness deviation between the first and second electrodes is 1/2 or less.   The flat fluorescent lamp according to claim 1, wherein a distance from the first electrode to the second electrode closest to the first electrode is 1 to 10 mm. In a flat fluorescent lamp filled with gas and sealed,
A front plate coated with a phosphor;
A back plate comprising in order a reflector, conductive first and second electrode parts printed to be electrically insulated from each other, a dielectric layer, and a phosphor;
A support for supporting between the front plate and the rear plate to form an airtight discharge space;
Consists of
The first electrode part is
A plurality of strip-type first electrodes in which at least two parallel strips are arranged in parallel in the discharge space;
A first lead electrode positioned outside the discharge space such that the plurality of first electrodes are joined;
Have
The second electrode part is
A plurality of strip-type second electrodes in which a number of strips corresponding to the number of the strip-type first electrodes are arranged in parallel to form a group so as to be symmetrical with the group of strip-type first electrodes. When,
A second lead electrode positioned outside the discharge space such that the plurality of second electrodes are joined;
A flat fluorescent lamp characterized by comprising:   The flat fluorescent lamp of claim 5, wherein the first and second electrodes are formed of a group of at least three or more strips.   6. The flat fluorescent lamp according to claim 1, wherein a width of the first and second electrodes is 0.3 to 1 mm.   The flat fluorescent lamp according to claim 5, wherein a width of a group of the three strips is 1 to 10 mm. A flat discharge tube filled with gas and having a certain thickness, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion and the discharge tube, and the dielectric In a flat fluorescent lamp including a phosphor applied to the layer,
The electrode portion is composed of a plurality of strip-type electrodes that are uniformly arranged in parallel to each other on one plane inside the discharge tube,
An electrode structure of a flat fluorescent lamp, wherein power supplies having opposite polarities are applied to the closest strip type electrodes during discharge. A flat discharge tube filled with gas and having a certain thickness, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion and the discharge tube, and the dielectric In a flat fluorescent lamp including a phosphor applied to a part of the layer,
The electrode unit includes a plurality of strip-type electrodes in which at least two parallel strips are grouped in a parallel discharge tube and are uniformly arranged on a single plane inside the discharge tube.
An electrode structure for a flat fluorescent lamp, wherein power supplies having opposite polarities are applied to the strip electrode groups closest to each other. A flat discharge tube filled with gas and having a certain thickness, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion and the discharge tube, and the dielectric In a flat fluorescent lamp including a phosphor applied to the layer,
The electrode portion is composed of a plurality of strip-type electrodes that are uniformly arranged in parallel to each other on one plane inside the discharge tube,
The strip-type electrode has a non-conductive region formed inside the peripheral edge,
An electrode structure of a flat fluorescent lamp, wherein power supplies having opposite polarities are applied to the closest strip type electrodes during discharge. The discharge tube comprises a flat front plate and a rear plate printed by the electrode part,
12. The electrode structure of a flat fluorescent lamp according to claim 9, wherein the front plate and the rear plate are joined to each other by frit glass and become airtight.

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