JP2802925B2 - Discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a discharge lamp suitable for a display fluorescent lamp, for example, a display element such as an electric display panel. It mainly relates to the intended discharge lamp.

(Prior Art) Conventionally, as this type of discharge lamp, FIG. 4 and FIG.
There is one configured as shown in the figure, which is formed on the upper end of the opening of the lower cylinder 101 formed of a ceramic with a bottomed cylinder, and is also formed of a ceramic with a bottomed cylinder having the same diameter as the lower cylinder 101. The upper cylinder 102 is mounted and fixed coaxially.

As shown in FIG. 4, the upper cylindrical portion 102 is circumferentially partitioned into, for example, three light-emitting chambers 104a, 104b, and 104c by a Y-shaped partition wall 103, and each of the chambers 104a to 104c has For example, a red fluorescent film R that emits red light, a green light-emitting film G that emits green light, and a blue light-emitting film B that emits blue light are respectively attached, and the upper end of the opening of the upper cylinder 102 is airtightly sealed by a flat transparent glass 105. It is sealed and configured in an airtight container 106.

The lower cylinder 101 has a common cathode (cathode) 1 in its central recess.
07 is sealed, and the anodes 108a, 108b, 108c are respectively accommodated in outer peripheral concave portions provided on the outer peripheral portion of the lower cylinder 101 corresponding to the respective light emitting chambers 104a, 104b, 104c.

The light-emitting chambers 104a, 104b, 104
c, discharge holes 109a, 109b, 109c,
Drill 110a, 110b, 110c respectively, common cathode 107 and anode 1
08a, 108b, 108c and discharge holes 109a, 10c.
9b, 109c, 110a, 110b, and 110c pass through.

Therefore, the common cathode 107 and the required anodes 108a, 108b, 108c
Are energized, the common cathode 107 and the required anodes 108a, 108
8b, 108c, when a discharge occurs, this discharge passes through the discharges 109a to 109c, 110a to 110c of the required light emitting chambers 104a, 104b, 104c, and generates ultraviolet light in the required light emitting chambers 104a, 104b, 104d, Due to this ultraviolet light, the fluorescent films R of the required light emitting chambers 104a, 104b, 104d,
G and B are excited to emit light, and required light is emitted to the outside through the transparent glass 105.

(Problems to be Solved by the Invention) However, in such a conventional discharge lamp, since the upper and lower tubes 101 and 102 are made of ceramics, the thicknesses and weights of these 101 and 102 are thick and heavy, and the processing accuracy and easiness of processing are low. There is a problem that it is brittle when the thickness is low and the thickness is reduced.

Therefore, the present invention has been made in consideration of the above circumstances,
The main object is to provide a discharge lamp which can be manufactured easily and can be reduced in size and weight.

[Configuration of the invention]

(Means for Solving the Problems) The invention according to claim 1 has an opening on at least one end side,
A metal cylindrical body having a glass coating formed on at least an inner surface thereof, and an airtight container made of a light-transmitting glass that hermetically seals an opening of the cylindrical body; a discharge medium sealed in the airtight container; and a discharge in the airtight container. Electrode means for generating a discharge in the medium. Here, the cylinder is not limited to a cylinder, but may be a square cylinder or a polygonal cylinder.

The invention according to claim 2 is the invention according to claim 1, wherein the metal cylinder has openings at both ends in the axial direction, a light-transmitting glass at an opening at one end, and a stem at an opening at the other end. Are hermetically sealed to form an airtight container, and one is disposed near the translucent glass and the other is disposed on the stem, respectively, to form a pair of electrode means in the airtight container.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the metal cylindrical body has a supporting step portion for supporting the light-transmitting glass at a sealing end portion for hermetically sealing the light-transmitting glass. And a rising portion that rises while surrounding the outer peripheral side surface of the light-transmitting glass in an airtight manner.

According to a fourth aspect of the present invention, in the third aspect, the airtight container is provided with a discharge regulating body for regulating a discharge path generated between the pair of electrode means, and the discharge regulating body is locked. The locking step is formed in a metal cylinder.

The invention of claim 5 is the invention of claim 4, wherein the discharge regulating body is sandwiched between the metal cylinder and the transparent glass.

(Operation) According to the first aspect of the present invention, since the cylindrical body is made of metal, the cylindrical body can be manufactured with high precision and easily by punching or the like, and the thickness of the cylindrical body can be reduced. ,
The size and weight of the discharge lamp can be reduced. In addition, since the glass coating, which is an electrical insulating coating, is formed on at least the inner surface of the metal cylindrical body, the electrical insulation treatment of the inner surface of the metal cylindrical body can be easily performed, and the discharge characteristics are improved even when a discharge is generated by the electrode means. Has no effect. Further, since the glass coating of the metal cylindrical body is formed by coating a glass material, a sealing step with another glass component such as translucent glass can be easily performed.

In the invention of claim 2, both ends of the metal cylinder are opened,
Since one of the two open ends is sealed with a stem having one of a pair of electrodes implanted therein, it is very easy to enclose the one electrode means in an airtight container, which simplifies the manufacture of the discharge lamp. Can be planned.

According to the third aspect of the present invention, the transparent glass is supported by the supporting step portion of the metal cylinder, and the outer peripheral side surface of the transparent glass is hermetically surrounded by the rising portion. Since the rising portion is made of metal, the thickness of the leading end of the rising portion can be reduced.

Therefore, when a large number of discharge lamps of the present invention are arranged as display elements such as an electric display panel, the arrangement density can be improved, and the resolution of the electric display panel or the like can be improved.

According to the fourth aspect of the present invention, the discharge path can be divided into a plurality of sections by the discharge regulating body. Therefore, by applying a fluorescent film that emits a required color to the surface of the discharge regulating body facing the discharge path, the required color can be obtained. Light emission can be emitted.

According to the fifth aspect of the present invention, since the discharge regulating body is sandwiched between the transparent glass and the locking step, the holding of the discharge regulating body is simple and the production of the discharge lamp can be simplified.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view showing the overall configuration of an embodiment of the present invention. In FIG.
Is formed in a rectangular cylindrical shape by, for example, punching a metal plate such as stainless steel or iron, and both ends in the axial direction (upper and lower ends in the figure) are opened.

The upper portion of the lamp casing 1 is gradually widened in two stages as shown in FIGS. 2 and 3 to form a rectangular upper step portion 2a and a lower step portion 2b, respectively. The entire inner peripheral surface of the lamp casing 1 from the lower end to the lower end is coated with a glass coating 1a, which is an electric insulating coating, so that when a discharge occurs in the lamp casing 1, the discharge characteristics are not affected. The release of the impure gas from the metal lamp casing 1 is prevented by the glass coating 1a.

A cylindrical portion 3 having a diameter slightly smaller than the width of the lamp casing 1 is integrally formed on the bottom of the lamp casing 1.
A central hole 3a is formed in the center of the bottom.

Next, the configuration of the present embodiment will be described generally in the order of assembly.

First, a glass disc-shaped button stem 4 is inserted into the lamp casing 1 as shown in FIG. 3, and is tightly fitted into the cylindrical portion 3, and is fixed by welding by a glass frit or high-frequency heating. A cathode 5, which is one of a pair of discharge electrodes, is implanted in the button stem 4. A pair of lead wires 6a, 6b supporting both ends of the cathode 5 extend through the button stem 4 in the plate thickness direction. It is electrically connected to a lighting circuit (not shown).

The button stem 4 has a center hole 4a formed in the center thereof and a glass exhaust pipe 7 communicating with the center hole 4a. The distal end of the exhaust pipe 7 extends outward from the bottom center hole 3a of the lamp casing 1 in a state of being fitted airtightly.

Therefore, the button stem 4 is inserted into the cylindrical portion 3 of the lamp casing 1 with the exhaust pipe 7 facing down, and is easily fixed by being fixed with a glass frit or the like, so that the mounting of the cathode 5 into the lamp casing 1 is extremely difficult. It will be easy.

Next, the outer casing 9 of the discharge regulating body 8 is inserted into the lamp casing 1 as shown in FIG.

The discharge regulating body 8 includes an outer casing 9 and a cross-shaped partition plate 11 fitted into the outer casing 9 to partition the outer casing 9 into, for example, four light-emitting chambers 10a, 10b, 10c, and 10d. On each inner surface of the outer casing 9 facing the light emitting chambers 10a to 10d and each outer surface of the partition plate 11, for example, fluorescent films 11a, 11b, 11c, and 11d having different emission colors for each of the light emitting chambers 10a to 10d are respectively provided. Has been adhered.

As shown in FIGS. 1 to 3, the outer casing 9 has a main body 9a formed in a truncated quadrangular pyramid shape as shown in FIGS. 1 to 3, and a lower end of the outer casing 9 is integrally formed with a square cylinder 9b. No fluorescent films 11a to 11d are attached to the inner surface of 9b.

As shown in FIG. 2, the outer casing 9 is supported in the lamp casing 1 with its outer surface at the axially intermediate portion of the main body 9a locked to each corner of the lower step 2b.

After inserting the outer casing 9 into the lamp casing 1, a cross-shaped partition plate 11 is inserted into the outer casing 9, and then, for example, four anodes 12 a, 12 b, 12 c, 12 d are connected to the lamp casing 1. Each of the lead wires 13a, 13b, 13c, 13d is inserted into each of the light-emitting chambers 10a to 10d, and the leading end of each of the lead wires 13a, 13b, 13c, 13d is extended through the bottom hole of the lower step portion 2b of the lamp casing 1 in an airtight manner. And is electrically connected to a lighting circuit (not shown).

Each of the anodes 12a to 12d is formed in a rectangular loop shape, arranged coaxially at the upper end of each of the light emitting chambers 10a to 10d of the discharge regulating body 8, and arranged so as to conform to the upper end shape of each of the light emitting chambers 10a to 10d, The inner periphery of each of the light emitting chambers 10a to 10d is configured to surround a rectangular shape.

Next, the transparent glass 14 of a rectangular flat plate is put into the lamp casing 1.
And the inner surface of the transparent glass 14 is brought into contact with both upper ends of the outer casing 9 of the discharge regulating body 8 and the partition plate 11, and the transparent glass 14 is moved by the glass frit to the upper step 2a. The transparent glass 14 is used as a transparent window of the discharge lamp.

Therefore, the discharge regulating body 8 is connected to the transparent glass 14 and the lower step portion.
2b, the discharge regulating body 8 can be easily mounted in the lamp casing 1 and can be reliably held.

The upper step 2a supports the inner surface of the transparent glass 14.
1 and the rising wall 2a-2 which vertically surrounds the outer surface of the transparent glass 14 and rises vertically in the drawing, so that the transparent glass 14 can be easily held by the upper step 2a, and The holding force can be increased.

Thereafter, as shown in FIG. 3, an external electrode 15 formed in a rectangular frame shape by a metal band plate is closely fitted to the outer periphery of the lamp casing 1 from below, so that the cathode 5 and the anodes 12a to 1a are formed.
2d and fixed to the lead wire connected to the external electrode 15
16 is electrically connected to a required lighting circuit or the like.

The external electrode 15 promotes ionization of the discharge space between the cathode 5 and each of the anodes 12a to 12d to reduce the starting voltage of the discharge lamp.

 Next, the operation of the present embodiment will be described.

When a required voltage is applied to the external electrode 15 while energizing the cathode 5 and a required anode, for example, 12a, ionization around the external electrode 15 in the lamp casing 1 is promoted, and the cathode 5 and the anode 12a are compared. Discharge occurs due to extremely low starting voltage, and ultraviolet rays are generated.

Therefore, this ultraviolet light is emitted from the light emitting chamber 10a having the anode 12a.
The desired light-emitting film 11a is excited to emit light of a required color, and this light is emitted to the outside from the transparent glass 14 forming a transparent window.

Further, since the lamp casing 1 is made of metal and has a light shielding property, light emitted in the light emitting chamber 10a can be prevented from being emitted to the side of the lamp casing 1. It is possible to prevent color mixing with emission colors of adjacent discharge lamps when many are arranged on a board or the like.

Further, when a discharge is generated between all the anodes 12a to 12d and the cathode 5, the ultraviolet rays of all the light emitting chambers 10a to 10d are irradiated with all the fluorescent films 11a to 11d
Is excited to emit light of each color, and the transparent glass 14 emits, for example, white or the like mixed with all of the emitted colors.

According to the present embodiment, since the lamp casing 1 is made of metal, the processing and manufacturing thereof are simple, and the thickness of the lamp casing 1 can be made smaller than that of ceramics. Can be achieved.

Further, according to the present embodiment, since the inner peripheral surface of the metal lamp casing 1 is entirely covered with the electric insulating coating 1a, the discharge gas generated in the lamp casing 1 releases the impure gas from the lamp casing 1. As a result, it is possible to prevent the lamp efficiency from being lowered.

Furthermore, since the button stem 4 having the cathode 5 implanted therein can be easily mounted in the lamp casing 1,
The assemblability of the discharge lamp can be improved.

Furthermore, the discharge space in the lamp casing 1 is divided into a plurality of discharge paths by the discharge restricting body 8, and the surfaces facing the respective discharge paths are covered with the fluorescent films 11a to 11d which emit light of a required color.
Various lights can be emitted.

Further, since the discharge regulating body 8 is sandwiched between the transparent glass 14 and the lower step 2b, the lamp casing 1 of the discharge regulating body 8
The inside can be easily fixed, and the fixing can be ensured.

Note that the lamp casing 1 may not be made of metal, and in this case, effects other than those obtained when the lamp casing 1 is made of metal can be obtained.

〔The invention's effect〕

As described above, in the first aspect of the present invention, since the cylindrical body is made of metal, the processing accuracy, the ease of processing, and the strength can be improved, and the size and weight can be reduced.
In addition, since the glass coating, which is an electrical insulating coating, is formed on at least the inner surface of the metal cylindrical body, the electrical insulation treatment of the inner surface of the metal cylindrical body can be easily performed, and the discharge characteristics are improved even when a discharge is generated by the electrode means. Has no effect. Further, since the glass coating of the metal cylindrical body is formed by coating a glass material, a sealing step with another glass component such as translucent glass can be easily performed.

In the invention of claim 2, both ends of the metal cylinder are opened,
Since one of the two open ends is sealed with a stem having one of a pair of electrodes implanted therein, it is very easy to enclose the one electrode means in an airtight container, which simplifies the manufacture of the discharge lamp. Can be planned.

According to the third aspect of the present invention, the transparent glass is supported by the supporting step portion of the metal cylinder, and the outer peripheral side surface of the transparent glass is hermetically surrounded by the rising portion. Since the rising portion is made of metal, the thickness of the leading end of the rising portion can be reduced.

Therefore, when a large number of discharge lamps of the present invention are arranged as display elements such as an electric display panel, the arrangement density can be improved, and the resolution of the electric display panel or the like can be improved.

According to the fourth aspect of the present invention, the discharge path can be divided into a plurality of sections by the discharge regulating body. Therefore, by applying a fluorescent film that emits a required color to the surface of the discharge regulating body facing the discharge path, the required color can be obtained. Light emission can be emitted.

According to the fifth aspect of the present invention, since the discharge regulating body is sandwiched between the transparent glass and the locking step, the holding of the discharge regulating body is simple and the production of the discharge lamp can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a discharge lamp according to the present invention,
2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is an exploded perspective view of the embodiment shown in FIGS. 1 and 2, FIG. 4 is a plan view of an example of a conventional discharge lamp, and FIG. FIG. 5 is a sectional view taken along line VV of FIG. 1 ... lamp casing (tubular body), 1a ... glass coating,
2a: Upper step, 2b: Lower step, 4: Button stem, 5: Cathode, 8: Discharge regulator, 10a to 10d
Light-emitting chamber, 12a to 12d: anode, 14: transparent glass.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01J 61/30 H01J 61/94

Claims (5)

(57) [Claims] 1. An airtight container made of a metal cylinder having an opening on at least one end side and having a glass coating formed on at least an inner surface thereof, and a light-transmitting glass for hermetically sealing the opening of the cylinder. A discharge lamp, comprising: a discharge medium sealed in the inside; and electrode means for generating a discharge in the discharge medium in the airtight container. 2. An airtight container is formed by hermetically sealing a metallic cylinder having openings at both ends in the axial direction, a light-transmitting glass at an opening at one end and a stem at an opening at the other end. And
2. A discharge lamp according to claim 1, wherein a pair of electrode means are formed in an airtight container, one of which is disposed near the translucent glass and the other of which is disposed on the stem. 3. A metal cylindrical body includes a supporting step for supporting the light-transmitting glass at a sealing end for hermetically sealing the light-transmitting glass;
3. The discharge lamp according to claim 1, wherein a rising portion which rises while surrounding the outer peripheral side surface of the transparent glass is hermetically sealed. 4. An airtight container is provided with a discharge restricting member for restricting a discharge path generated between a pair of electrode means, and a locking step for locking the discharge restricting member is formed in a metal cylindrical body. The discharge lamp according to claim 3, wherein: 5. The discharge lamp according to claim 4, wherein the discharge regulating body is sandwiched between the metal cylinder and the transparent glass.