JPH02216750A - Low pressure discharge lamp and its manufacture - Google Patents

Abstract

PURPOSE:To form accurately and easily a small size groove which can be hardly formed by a glass stamping, and to manufacture a small and thin size of discharge lamp easily, by superposing plural base bodies to a low pressure discharge lamp, and forming a discharge route by the groove engraved at one side of the border. CONSTITUTION:A scheduled surface 11 of superposing is formed at one side of the first square glass base body 1 of a specific thickness, a contact surface 12 of a specific depth of step surrounding the periphery is formed, and a U-shape groove 13 whose section is linking to the periphery of the base body 1 of a specific width and depth is cut and formed. An exhaust groove 14 linking from the middle part of the U-shape groove to the periphery of the base body 1 is formed, and furthermore, a fluorescent membrane 15 is formed at the inner surface of the U-shape groove 13. The second base body 2 is formed by a glass plate in the form and the size responding to the scheduled surface 11 of the first base body 1, and closely superposed on the base body 1. By superposing the base bodies 1 and 2, a discharge route 4 is formed, the opening surface of the U-shape groove 13 is closed by the base body 2, and stems 42 furnishing filaments 41 are placed at both ends of the discharge route 4 and sealed airtight.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention can be configured to be small and thin, has a uniform light distribution, and can be used even in a narrow space. The present invention relates to a low-pressure discharge lamp suitable for backlighting of optical equipment such as machines, and a method for manufacturing the discharge lamp.

(Prior Art) In recent years, so-called liquid crystal television receivers using liquid crystal display devices have been developed in order to make television receivers thinner.

Since the liquid crystal panel used in such a liquid crystal display device does not emit light by itself, it is necessary to use some kind of light source as a backlight to obtain a certain level of brightness by transmitting light through the liquid crystal panel. The illumination light source used in such a backlight type display device is required to be thin and capable of providing uniform light distribution. A suitable light source for this purpose is (
1) Small U-shaped or W-shaped low-pressure discharge lamps.

Alternatively, (2) a lamp in which a flat sealed space is formed using a glass plate and a planar discharge is generated inside the space has been proposed and actually used. (Refer to Japanese Unexamined Patent Publication No. 60-225347) (Problem to be solved by the invention) Among the above-mentioned conventional techniques, (1) combines a reflecting plate and a diffuser plate and changes the shape of the plate in order to receive a uniform illuminance distribution. It required some ingenuity, and there was a limit to how thin it could be.

In addition, technology (2) does not require a reflector and can provide a relatively uniform illuminance distribution, but the energy loss in the electrodes is large, and at present the brightness is about 1710, which is normally required for backlights. All you get is brightness. In addition, there are problems with the mechanical strength of constructing a sealed space with a glass plate, and the glass plate becomes extremely thick and heavy, especially when used as a backlight for large LCD television receivers. There was a problem.

The object of the present invention is to be small and thin, and to easily obtain uniform light distribution.
It is an object of the present invention to provide a low-pressure discharge lamp that is convenient for installation in a narrow space and suitable for backlighting of optical equipment, and a method for manufacturing the same.

[Structure of the invention]

(!l!Means for solving the problem) The present invention provides a small and thin low-pressure discharge lamp that is easy to obtain uniform light distribution, and a method for manufacturing the same. This low-pressure discharge lamp is made up of multiple layers of substrates, and a groove is cut on at least one side of the boundary surface to form a discharge path, thereby making the lamp small and thin.

(2) The second aspect of the present invention is a low-pressure discharge lamp in which the generated light passes through a grooved base and is radiated outward to make the luminance distribution uniform.

(3) Claim 3 is the low-pressure discharge lamp according to claim 1 or 2, in which three or more discharge paths are provided, and the discharge path is red.
This is a low-pressure discharge lamp that is coated with fluorescent films that emit light in green and blue, respectively, so that it emits light in three colors.

(4) Claim 4 is characterized in that a plurality of substrates each having a groove cut on at least one of the layers to be layered are layered on the layer to be layered and are airtightly joined to form the groove as a discharge path, so that the discharge path can be easily formed. It became possible to form

(Function) By cutting grooves on the surface of a glass substrate, it is possible to form small grooves very accurately and easily, which is extremely difficult to do when molding glass. Therefore, it is extremely suitable for small-sized, low-output, low-pressure discharge lamps. Further, if three colors of phosphors are applied to a device having three or more discharge paths, each color of light can be emitted individually or three colors of light can be emitted simultaneously. Furthermore, if a groove is formed on at least one of the layers to be layered and the grooves are layered on the layers to be layered, the grooves will be closed and a discharge path can be easily formed, which is suitable for manufacturing a small and thin discharge lamp.

(Example) The details of the invention are illustrated by the following examples.

Example 1 This example is a basic example of the present invention, and its details are shown in FIG. (1) is a plate-shaped first substrate made of glass, (
2) is a plate-shaped second substrate made of glass closely polymerized to the first substrate (1), and (3) is a circumferential substrate (1).

The boundary surface of (2), (4) is the discharge path formed on this boundary surface (3), and (5), (5) is the glass solder that airtightly seals the circumferential substrate (LL (2) at its periphery). be.

The first substrate (1) is a rectangular glass plate with a thickness of 51, as shown exploded in FIG.
and surround the periphery to a depth of approximately 0.05II11.
A step-shaped joint surface (12) is formed, and a U-shaped groove (13) is cut in the one-layered surface (11), which has a rectangular cross section of 4I4IIIm and a depth of 2.511Im and communicates with the - side of the base (1). An exhaust groove (14) is formed in the U-shaped groove and communicates with the other side of the substrate (1) from the middle part of the U-shaped groove, and a fluorescent film (15) is formed on the inner surface of the U-shaped groove (13). be.

The second substrate (2) is a glass plate with a thickness of about 2.5 mm, and has a shape and dimensions corresponding to the surface to be overlaid (11) of the first substrate (1), and is designed to be closely polymerized. It has become.

The discharge path (4) is formed by closely polymerizing the circumferential substrates (1) and (2), so that the opening surface of the U-shaped groove (I3) is formed on the second substrate (2).
The discharge channel (4) is hermetically closed with a pair of stems (42), (42) having filaments (41), (41) at both ends, and an exhaust groove (
14), a glass exhaust pipe (43) is embedded and hermetically sealed.

Next, one example of a method for manufacturing this low pressure discharge lamp will be explained with reference to FIG. First, two types of glass plates with a thickness of 5 m and a thickness of 2.5 m are prepared, and the first and second substrates (1) and (2) are cut from them. Then, a bonding surface (12) and a U-shaped groove (1
3) and the exhaust groove (14) are cut. Especially the joint surface (1
2) is polished and smoothed. Furthermore, if necessary, the surface to be overlaid (11) is also smoothed. Next, the second base (2
) (not visible in Figure 2) is polished and smoothed, and if necessary, the surface to be overlaid (not visible in Figure 2) is also smoothed.

Next, a fluorescent film (15) was formed on the inner surface of the U-shaped groove (13) of the first substrate (1), and frit glass, which is a type of glass solder, was coated on the end of the U-shaped groove (13). Stem (4
2), and an exhaust pipe (43) similarly coated with frit glass is positioned in the exhaust groove (14).

Then, each joint surface of one base (1) and (2) (
12), the two substrates (1) and (2) are overlapped with the joint surfaces (12) aligned with each other, held tightly and placed in a heating furnace, the frit glass is melted and both The bases (1) and (2) are hermetically connected, and a discharge path (4) is formed.
form. The discharge lamp is then exhausted from the exhaust pipe (43), filled with 10 Torr of argon and an appropriate amount of mercury as a starting gas, and sealed to complete the discharge lamp.

When this low-pressure discharge lamp is turned on, a discharge occurs between the filaments (41) and (41) in the discharge path (4), generating ultraviolet rays, which excites the fluorescent film (15) and causes it to emit light. It is derived from both the front and back surfaces of the substrates (1) and (2). Therefore, by arranging a desired light emitting surface of the substrates (1) and (2) to face the object, desired illumination can be obtained.

However, as mentioned above, this low-pressure discharge lamp has a thickness of 5 mm and 1 mm.
A first base (1) with a thickness of 2.5 ma+ and a second base (1) with a thickness of 2.5 ma+
2) and 2) are pasted together, so the total thickness is approximately 7
．． It is only 5 mm and can be configured extremely thin.

In addition, since the discharge path (4) is narrow, high brightness can be obtained, and the light emitted from the fluorescent film (15) is transmitted to the glass substrates (1) and (2).
Since the light is emitted after passing through the interior of the lamp, there is relatively little unevenness in brightness on the light emitting surface.Also, this discharge lamp has two glass plates bonded together and receives external force at the interface (3), making it extremely durable. Therefore, it is also possible to enlarge the light emitting surface.

Furthermore, this low-pressure discharge lamp has a layered surface (11) of the base (1).
), the groove (13) can be machined to a small size with high accuracy, and the discharge path (4) can be formed to a small diameter. Furthermore, since the heat of the discharge lamp is radiated from the entire surface of both bases (1) and (2), there is little heat radiation.

Example 2 This example is an applied version of the above-mentioned Example 1, the details of which are shown in FIG. and a light-reflecting film (7) such as a metal vapor deposited film, a silver mirror film, or a light-reflective powder film is formed on the back surface of the second substrate (2), and the other same parts are given the same reference numerals and their explanations will be omitted.

In this case, the light emitted from the fluorescent film (15) is reflected by the reflective film (7).
The light is reflected by the beam, directed toward the front, and diffused and emitted by the light scattering surface (6).

Further, light incident on the front surface from an oblique direction is diffusely emitted from the light scattering surface (6) without being totally reflected. Therefore, in this embodiment, the luminous efficiency is high, the luminance distribution of the light-diffusing surface (6) is uniform, and a reflecting plate is not required, so that the lighting device as a whole can be configured to be extremely small and thin. Moreover, since it emits less heat, it is suitable for backlights for optical equipment. Other advantages of the first embodiment are also the same in the second embodiment. Furthermore, in this embodiment, the thickness of the second base body (2) can be made as thin as possible within a range that can withstand processing and handling, for example, it is easy to make the thickness 2 mw+ or less.

Example 3 As shown in FIG. 4, this example combines the second substrate (2) and the light reflective film (7) in Example 2 described above into one plate-shaped metal substrate (27) with internal reflective properties. Other identical parts are given the same reference numerals and explanations will be omitted.

In this case, the metal plate (27) can be made extremely thin, so the overall thickness of the discharge lamp can be made even thinner than in both of the above embodiments.
It is possible to have a lighter structure, and it is also possible to make the light emitting surface larger.

Moreover, even though the metal base (27) constituting the second base is exposed to the discharge path, there is no problem with discharge. Other effects similar to those of Example 2 are obtained.

Example 4 This example is a low-pressure discharge lamp having a large number of discharge paths, the details of which are shown in FIG. 1) A second plate-shaped substrate made of glass (2,) is tightly polymerized between the substrates (1) and the respective interfaces (3) of the two substrates (1), (3) has a U-shaped discharge path (4).

(4) are respectively formed, and the front surface of one first base body (1) located in the front is formed as a light-diffusing surface (6),
A light reflecting film (7) similar to that described above is formed on the back surface of the other first base (1) located further back. They are distributed so that they are distributed as evenly as possible. Other identical parts are given the same reference numerals and explanations will be omitted.

This device has a large number of discharge paths (4), (4), and therefore has a large output.Furthermore, the discharge paths (4), (4) can be easily distributed and the brightness distribution can be made even more uniform. Other advantages described in the first embodiment are also the same in the fourth embodiment.

Example 5 This example is a low-pressure discharge lamp that emits light in three colors, the details of which are shown in Figure 6.
base (1) and a second base (1) in the shape of a glass plate (
2) and the interface (3) of the first substrate (1).
Three independent discharge paths (4) were created by cutting a rectangular groove in the
4) , (4) is formed and a fluorescent film (15R), (15G), (
15B), a light-diffusing surface (6) is formed on the front surface, and a light-reflecting film (7) is formed on the back surface.Other identical parts are designated by the same reference numerals and explanations thereof will be omitted.

This thing has three discharge paths (4), (4), (4
) can be discharged at the same time to emit three colors of light at the same time, or the three discharge paths (4), (4), and (4) can be discharged individually to selectively emit light of a desired color. It is also possible to emit light. Therefore, it is suitable for backlights of liquid crystal color television receivers and the like. Moreover, Example 2
The effects described above are also the same in this embodiment.

Embodiment 6 This embodiment is a backlight illumination device for a liquid crystal display device using the low-pressure discharge lamp of Embodiment 2 described above.
As shown in the figure. In the figure, (A) shows a liquid crystal display device, which is an example of an optical device. (B) shows the back illumination (
This is a lighting device that provides backlighting. The liquid crystal display device (A) has polarizing plates (A2) and (A2) superimposed on the front and back surfaces of a liquid crystal panel (AI), respectively, and the liquid crystal panel (AI) is connected to a control device 1f (A3). .

The above lighting device (B) is a device in which the low pressure discharge lamp (B1) of the above-mentioned embodiment 2 shown in Fig. 3 is connected to a lighting device (B2), and each part of the low pressure discharge lamp (old) is shown in Fig. 3. The same reference numerals used in the above are given and the explanation will be omitted.

In this device, the low-pressure discharge lamp (old) can be configured extremely thin and compact, as mentioned above, so the liquid crystal display (
In combination with A), it can be configured thinly and also has a light-diffusing surface (6)
Since the light is emitted from the entire surface of the liquid crystal display device (A) with approximately --like brightness, the liquid crystal display device (A) can be illuminated with --like brightness, and the display can be accurately and clearly identified.

Although various embodiments have been described above, the present invention is not limited to these, and it is also possible to form a discharge path by cutting a groove in the second base.
It is also possible to form shallow grooves corresponding to the intended overlapping surfaces of both substrates, and when both substrates are superposed, both grooves may be integrated to form one discharge path. Also, the luminescent color is 2 or 4 colors.
It can be more than just a color.

Furthermore, the present invention is not limited to fluorescent discharge lamps, but can be applied to all low-pressure discharge lamps and has similar effects.

〔Effect of the invention〕

As described above, the present invention relates to a low-pressure discharge lamp and a method for manufacturing the same. This is a low-pressure discharge lamp that is small and thin by forming a discharge path.

(2) Claim 2 is an applied form of claim 1, which is a low-pressure discharge lamp in which the generated light passes through a grooved base and radiates outward to make the luminance distribution uniform. It is.

(3) Claim 3 is an applied form of claim 1 or 2, in which three or more discharge paths are provided, and fluorescent films that emit red, green, and blue light are respectively coated on the inner surfaces of the discharge paths, and three colors are used. This is a low-pressure discharge lamp that can emit light.

(4) Claim 4 is an invention of a manufacturing method, in which a plurality of substrates each having a groove cut on at least one of the surfaces to be layered are stacked on each other on the surface to be layered, and the grooves are airtightly joined to form a discharge path. This is a method for easily manufacturing the above-mentioned low pressure discharge lamp.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a first embodiment of the low-pressure discharge lamp of the present invention;
Figure 2 is an exploded perspective view showing the state before assembly;
The figure is a sectional view of the second embodiment, FIG. 4 is a sectional view of the third embodiment, FIG. 5 is a sectional view of the fourth embodiment, and FIG. 6 is a sectional view of the fifth embodiment. FIG. 7 is an explanatory diagram of an example of a lighting device using the low-pressure discharge lamp of the second embodiment.

Claims (4)

[Claims] (1) A low-pressure discharge lamp comprising a plurality of laminated substrates, a discharge path is formed by cutting a groove on at least one side of the boundary surface thereof, and electrodes are provided at both ends of the groove. (2) The low-pressure discharge lamp according to claim 1, characterized in that the generated light is transmitted through a base having grooves cut therein and radiated outward. (3) The low-pressure discharge lamp according to claim 1 or 2, characterized in that there are three or more discharge paths, and each of these discharge paths is coated with a phosphor that emits red, green, and blue light. (4) A low-pressure discharge lamp characterized in that a plurality of substrates each having a groove cut in at least one of the layers to be layered are layered on the layer to be layered and hermetically joined together, and the groove is formed as a discharge path. Production method.