JP2000294194A - Discharge lamp, manufacture of discharge lamp and device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp having high radiation efficiency while dispensing with particular components such as a lamp cover. SOLUTION: The width Y of an opening part 58 of this discharge lamp 71 is set to 55-100% of the width X of a radiation surface 66 of a light guiding body 64, so that the intensity of the light emitted from the light guiding body 64 to an LCD 63 is enhanced. A second fluorescent film 57 thinner than a first fluorescent film 56 is formed in the opening part 58 of a lamp tube 54, and light emission is carried out in the opening part 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp used for, for example, a backlight, a reading light source for equipment, a method of manufacturing the same, and an apparatus using the same.

[0002]

2. Description of the Related Art FIG. 12 is a diagram showing a conventional illuminating device using a backlight disclosed in Japanese Patent Application Laid-Open No. 10-162617. The liquid crystal display device 1 includes a backlight 4 in which a pair of left and right light source devices 2 (only one side is shown in the drawing) and a light guide unit 3, a flat transmissive liquid crystal display element 5, and a backlight It is formed by a housing 6 that houses and holds the light 4 and the transmissive liquid crystal display element 5. The backlight 4 is arranged on the non-light-emitting surface 7 side of the transmissive liquid crystal display element 5.

The light guide unit 3 is formed by stacking and fixing a reflection sheet 8, a light guide plate 9, a light diffusion sheet 10, and a lens sheet 11. The light guide plate 9 has an incident surface 12 on which light is incident and a light emitting surface 13 from which the incident light is emitted, and the light diffusion sheet 10 is laminated on the light emitting surface 13.

The light source device 2 is mainly composed of a conventional reflective cold cathode lamp 14. In the reflective cold cathode lamp 14, a rare gas such as xenon gas is sealed in a glass bulb 15 formed in a cylindrical shape, and a reflective film 16 coated with titanium oxide is formed on the inner peripheral surface thereof. . The reflection film 16 is not formed on the entire inner peripheral surface of the bulb 15, but has a range of about 90 ° that is missing. This missing portion is formed to be elongated along the axial direction of the bulb 15. An opening 17 for emitting light is provided, and the opening 17 is opposed to the light incident surface 12 of the light guide plate 9 in parallel. Around the reflective cold-cathode lamp 14, the incidence efficiency of the light emitted from the opening 17 to the light guide plate 9 is increased,
Further, a lamp cover 18 is attached to increase the light emission surface luminance of the backlight 4.

Since the liquid crystal display device 1 uses the reflective cold-cathode lamp 14 as a light source, most of the light emitted from the reflective cold-cathode lamp 14 passes through the opening 17 to the incident surface of the light guide plate 9. The light is emitted toward No. 12 and the light use efficiency is high.

FIG. 13 is a diagram showing a conventional lighting device using a backlight described in the above publication. In FIG. 12, the same portions as those described above are described using the same reference numerals. The basic structure of the liquid crystal display device 19 is the same as that of the liquid crystal display device 1 shown in FIG. 12, and a combination of a pair of left and right light source devices 20 (only one side is shown in the drawing) and a light guide unit 21. Backlight 22
And a flat transmissive liquid crystal display element 5 serving as a display unit, and a housing 6 for housing and holding the backlight 22 and the transmissive liquid crystal display element 5. The backlight 22 is provided on the non-light-emitting surface 7 of the transmissive liquid crystal display element 5.
Located on the side.

The light source device 20 is mainly composed of a reflective cold cathode lamp 14 which is a reflective light source. In the reflective cold cathode lamp 14, a rare gas such as xenon gas is sealed in a glass bulb 15 formed in a cylindrical shape, and a reflective film 16 coated with titanium oxide is formed on the inner peripheral surface thereof. . The reflection film 16 is not formed on the entire inner peripheral surface of the bulb 15, but has a range of about 90 ° that is missing. This missing portion is formed to be elongated along the axial direction of the bulb 15. The opening 17 emits light.

The light guide unit 21 includes a reflection sheet 23
The light guide plate 9, the light diffusion sheet 24, and the lens sheet 11 are laminated and fixed. Light guide plate 9
Is formed with an incident surface 12 on which light from the reflective cold cathode lamp 14 is incident and a light emitting surface 13 on which the incident light is emitted.
4 are stacked.

The reflection sheet 23 is provided on the light source device 20.
The outer peripheral dimension of the side opposite to the light guide plate 9 is formed to be larger than the light guide plate 9 and extends to a position covering half of the circumference of the reflective cold cathode lamp 14. One side along the longitudinal direction of (the lower side in the drawing)
Are covered by the reflection sheet 23. Also, the light diffusion sheet 24 is formed to have a larger outer peripheral dimension on the side facing the light source device 20 than the light guide plate 9, and extends to a position covering half of the circumference of the reflective cold cathode lamp 14. The other side (upper side in the drawing) of the reflective cold cathode lamp 14 along the longitudinal direction of the opening 17 is covered with the light diffusion sheet 24.

In such a configuration, light is emitted from the opening 17 by turning on the reflective cold cathode lamp 14. Part of the light emitted from the opening 17 is deviated from the light incident surface 12 of the light guide plate 9 and is reflected by a portion of the reflection sheet 23 or the light diffusion sheet 24 that extends toward the light source device 20 from the light guide plate 9. After being reflected, the light is guided to the incident surface 12. Therefore, most of the light emitted from the opening 17 enters the light guide plate 9 from the incident surface 12, and the efficiency of incidence on the light guide plate 9 increases. The light incident on the light guide plate 9 from the incident surface 12 is emitted from the light emitting surface 13 of the light guide plate 9 and irradiates the transmission type liquid crystal display element 5 from the non-light emitting surface 7 side. Since the efficiency of incidence on the light guide plate 9 is high, the amount of light emitted from the light emitting surface 13 increases, the luminance of the light emitting surface of the backlight 22 increases, and the luminance of the liquid crystal display of the transmissive liquid crystal display element 5 decreases. Get higher.

In addition, the reflection sheet 23 and the light diffusion sheet 2
By extending the light guide 4, the efficiency of incidence on the light guide plate 9 is increased, and the luminance of the light emitting surface of the backlight 22 and the luminance of the liquid crystal display are increased. Therefore, it is possible to increase the efficiency of incidence on the light guide plate 9 and the luminance of the light emitting surface of the backlight 22 and the luminance of the liquid crystal display without using a dedicated component such as a lamp cover, thereby reducing the number of components. With
Lower costs.

[0012]

In the conventional lighting device shown in FIG. 12, a lamp cover 18 is provided, and light emitted in a direction deviating from the incident surface 12 is emitted from the lamp cover 1.
Although the light is reflected at 8 and guided to the incident surface 12, there is a problem in that the use of a lamp cover increases the number of parts and increases the cost. Also, the lamp cover 1
Use of 8 causes a problem that the thickness of the lighting device is increased. Furthermore, since the lamp cover 18 is often made of metal, a leakage current flows, and in particular, there is a problem that the discharge becomes unstable in a cold cathode lamp. In addition, since electric charges easily accumulate in the lamp cover, there is a drawback that dust and the like in the air are adsorbed and become dirty.

In the illumination device shown in FIG. 13, the lamp cover 18 is eliminated, and instead, the reflection sheet 23 and the light diffusion sheet 24 are extended so that the light emitted in the direction deviating from the incident surface 12 is emitted. Although the light is reflected and guided to the incident surface 12, there is a problem that the reflection sheet 23 and the light diffusion sheet 24 must be extended.
Further, there is a problem that the thickness of the lighting device is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has been made in consideration of a discharge in which light irradiation efficiency is improved with respect to a light irradiation surface such as an incident surface of a light guide plate. It is intended to provide a lamp. Another object of the present invention is to provide a discharge lamp which is inexpensive and free from unstable discharge and no stain on the lamp, since a dedicated component such as a lamp cover is not required.

[0015]

A discharge lamp according to the present invention includes a reflective film having a band-shaped opening having a predetermined width, and the opening has a width of 55 to the width of an irradiation surface for irradiating light. % To 100%, preferably 60%
It is characterized by a width of up to 95%.

The discharge lamp has a fluorescent film inside the reflective film and the opening, and the thickness of the fluorescent film in the opening is not more than の of the thickness of the fluorescent film inside the reflective film. Preferably, the thickness is set to 1/2 to 1/8.

The discharge lamp is characterized in that a transparent spacer is provided outside the lamp tube so that the lamp tube surface is installed at a distance of 3% to 20% of the lamp tube diameter from the irradiation surface. I do.

A method for manufacturing a discharge lamp according to the present invention comprises:
Forming a reflective film on the entire inner periphery of the lamp tube, forming a first fluorescent film on the entire inner periphery of the reflective film, and forming the reflective film and the fluorescent film in a band shape in the axial direction of the lamp tube. Removing and forming a band-shaped opening, after forming the opening,
Forming a second fluorescent film on the entire inner periphery of the lamp tube.

The opening width of the opening is 55% to 100%, preferably 60% with respect to the width of the irradiation surface for irradiating light.
It is characterized by a width of up to 95%.

[0020] The second fluorescent film is 1/1 of the first fluorescent film.
2 or less, desirably, is formed to a thickness of 1/2 to 1/8.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a perspective view of a discharge lamp 71 of the present invention. The discharge lamp 71
A lamp tube 54 is provided. The lamp tube 54 is a glass tube having a lamp tube diameter (outer diameter) of 2.0 mm and 2.6.
mm, 4.0 mm, and 4.6 mm. Hereinafter, the diameter (outer diameter) of the lamp tube 54 is referred to as a lamp tube diameter D. At both ends of the lamp tube 54, electrode covers 59 are provided. The electrode cover 59 is a cover that covers a harness portion connecting the introduction wire 51 and an electrode (not shown). In addition, the lamp tube 54 is provided with an opening 58 for emitting light formed in a band along the axial direction of the lamp tube 54. Around the lamp tube 54, transparent rubber rings 53 are provided at several places. Transparent rubber ring 5
Reference numeral 3 is made of a material such as transparent silicon rubber, transparent plastic, or transparent acrylic.

FIG. 2 shows the discharge lamp 71 shown in FIG.
FIG. 3 is a cross-sectional view illustrating a backlight device to which a discharge lamp 71 is attached. Inside the lamp tube 54, a reflection film 55 coated with titanium oxide is provided. The portion where the reflective film 55 is removed in a strip shape is the opening 58.
It has become. Further, a first fluorescent film 56 and a second fluorescent film 57 are provided inside the lamp tube 54. The first fluorescent film 56 is not provided in the opening 58, but the second fluorescent film 57 is provided inside the reflective film 55 and in the opening 58.

The backlight device includes a light guide 64, a reflection sheet 65, a light diffusion sheet 101, a lens sheet 102, and a color filter 103. Also,
An LCD (Liquid Crystal Display) 63 is provided on the side of the light guide 64 from which light is emitted.

Next, the operation will be described. When the discharge lamp 71 is turned on, the phosphors in the first phosphor film 56 and the second phosphor film 57 emit light and emit light. The feature here is that since the second fluorescent film 57 is provided in the opening 58, light is emitted also in the opening 58, and the emitted light is emitted. If the second fluorescent film 57 is not provided in the opening 58, no light is emitted in the opening 58, and the brightness cannot be improved. However, if the second fluorescent film 57 is thick, the intensity of light passing therethrough is weakened. Therefore, a major feature is that the thickness of the second fluorescent film 57 is smaller than the thicknesses of the other fluorescent films. Assuming that the thickness of the first fluorescent film 56 is U and the thickness of the second fluorescent film 57 is V, the thickness of the fluorescent film in the opening 58 is V, but is provided on the inner periphery of the reflective film 55. The thickness of the obtained fluorescent film is U + V = W. The thickness of the fluorescent film in the opening 58 is not more than の of the thickness of the fluorescent film of the reflective film 55 and larger than 0, preferably, １ ／ to ８.

The light generated from the fluorescent film is reflected by the reflection film 55 and irradiates the irradiation surface 66 at the end of the light guide 64. The width of the irradiation surface 66 at the end of the light guide 64 where the light is irradiated is hereinafter referred to as the width X of the irradiation surface 66. The width of the opening 58 from which light is emitted is hereinafter referred to as the width Y of the opening 58. When the width X of the irradiation surface 66 is 100%,
The width Y of the opening 58 is set to 55% to 100%, preferably 6%.
It is better to be 0% to 95%. The reason will be described below.

FIG. 3 shows that the lamp tube diameter D is 2.0 mm;
Discharge lamp 71 having 6 mm, 4.0 mm, and 4.6 mm
FIG. 5 is a diagram showing characteristics when the fluorescent lamps of these lamps have the same thickness and the discharge lamp 71 is turned on at the same current density according to the lamp tube diameter D. In FIG. 3, the horizontal axis represents the lamp opening width ratio. The lamp opening width ratio is defined as an opening width that is 1/2 of the lamp tube diameter D, that is, an opening width having the same length as the radius is 100%.
The values of the opening width are shown. That is, in FIG. 2, when the width Y of the opening 58 is D / 2, the opening width ratio is 100%. In FIG. 3, the vertical axis indicates the lamp surface luminance ratio of the opening 58. The vertical axis also shows a luminance value when the lamp surface luminance when Y = D / 2 is 100%. The values shown in FIG. 3 indicate the average values when the measurement was performed while changing the lamp tube diameter D by four types. It can be seen from FIG. 3 that the smaller the lamp opening width ratio, the higher the lamp surface luminance ratio. FIG. 3 shows that the smaller the width Y of the opening 58 shown in FIG. 2 is, the higher the brightness of the light incident on the light guide 64 is. Then, the opening 5
The brightness of the light actually emitted from the light guide 64 was measured by changing the value of the width Y of 8. FIG. 4 shows the results.

FIG. 4 is a diagram showing the relationship between the lamp opening width and the brightness of the light guide. In FIG. 4, the horizontal axis indicates the lamp opening width ratio with respect to the thickness of the light guide 64. That is, the ratio of the width (opening width) Y of the opening 58 to the width X of the irradiation surface 66 is shown. In FIG. 4, the vertical axis indicates the luminance of light emitted from the light guide surface where the light guide 64 and the LCD 63 are in contact. On the vertical axis, 100% means emission from the light guide surface when a discharge lamp is used in a case where the opening 58 does not exist in the lamp, that is, when a fluorescent film is applied to the entire inner periphery of the lamp. Of the light to be emitted. The characteristics shown in FIG. 4 are measured when the light guide 64 and the discharge lamp 71 are separated by 0.2 to 0.4 mm. Also,
When the thickness of the light guide 64 was 2 mm, the cases where the lamp tube diameter D was 2 mm and 2.6 mm were tested. In addition, the light guide 6
When the thickness of 4 was 4 mm, the cases where the lamp tube diameter D was 4 mm and 4.6 mm were tested. Further, the test was performed by adjusting the thickness of the fluorescent film to the lamp tube diameter D and adjusting the current density with respect to the lamp tube diameter D. As shown in FIG. 4, the luminance of the surface of the light guide exceeds 100% when the width Y of the opening 58 is about 55% to 100% of the width X of the irradiation surface 66. The case where the luminance increases is the case where the width Y of the opening 58 is 60% to 95% of the width X of the irradiation surface 66. In particular, 7
0% to 80% has the highest luminance. FIG. 5 shows a case where the width Y of the opening 58 is 55% of the width X of the irradiation surface 66. FIG. 6 shows a case where the width Y of the opening 58 is 75% of the width X of the irradiation surface 66, and shows a case where the luminance of the surface of the light guide 64 is the highest. FIG. 7 shows a case where the width Y of the opening 58 is 100% of the width X of the irradiation surface 66. As described above, the width Y of the opening 58 is 55% to 100%, preferably 60% to 95% of the width X of the irradiation surface 66.
The light reflected by the reflection film 55 can efficiently irradiate the irradiation surface 66 and emit high-luminance light from the light guide 64 by having any one of the above values.

According to the characteristics shown in FIG. 3, the smaller the width Y of the opening 58, the higher the brightness of the lamp surface, so that the irradiation surface 66 can be efficiently irradiated. However, in practice, this is not the case. As shown in FIG. 4, the size of the width Y of the opening 58 is selected according to the thickness of the light guide 64, that is, the size of the width X of the irradiation surface 66. It was found that high-brightness light could be obtained.
Conventionally, there has been no idea of increasing the luminance of light emitted from the light guide 64 by focusing on the ratio of the width X of the irradiation surface 66 to the width Y of the opening 58. The present invention provides an illumination surface 66.
The feature is that high-luminance light is obtained based on the ratio of the width X of the opening 58 to the width Y of the opening 58.

A feature of the present invention is that the second fluorescent film 57 is formed. In addition, it is characterized in that the second fluorescent film 57 is made thinner than the first fluorescent film 56. After the opening 58 is formed, the second fluorescent film 57 is formed.
Is formed on the entire inner circumference, so that in the opening 58,
A thin phosphor film will be created. If the second fluorescent film 57 is not formed in the opening 58, no light is emitted in the opening 58. Further, since the opening 58 is exposed, it is easy to cool down. Dirt such as mercury oxide formed by the reaction of a small amount of oxygen or moisture generated inside the lamp tube 54 with mercury due to lighting and mercury, and carbon compounds and the like are also opened. The light is easily collected at the portion 58, and the light transmittance is deteriorated. That is, the brightness cannot be maintained. By providing the second fluorescent film 57, dirt on the inner surface is prevented from approaching the opening 58, and the amount of light emission is increased by causing the opening 58 to emit light.

FIG. 8 shows a discharge lamp in which the width Y of the opening is set to 60%, 75%, and 95% of the width of the irradiation surface 66 for the discharge lamp in which the second fluorescent film, which is a feature of the present invention, is formed thin. Of the luminance over time. The figure also shows, for comparison, the characteristics of a lamp having a width of the opening of 75% and no formation of the second phosphor film. Even if the lighting time increases due to the presence of the second fluorescent film, the decrease in luminance is small. That is,
The effect that the brightness can be maintained by the second fluorescent film is obvious. The lamp diameter of these lamps is 2.6 mm. If the second fluorescent film 57 is too thick, the transmittance of light from the opening 58 is reduced. Therefore, it is desirable that the second fluorescent film 57 be thin. First fluorescent film 5
The thickness of 6 are those phosphor is made is 4 to 8 mg / cm ² coating, the thickness of the second phosphor layer 57 is made is at least 0.5 mg / cm ² coating. The thickness of the second fluorescent film 57 is 以下 or less, preferably 厚 to ８ of the thickness of the first fluorescent film. When the thickness is larger than 1/2, the light transmittance is reduced, and when the thickness is smaller than 1/8, the contribution of light emission from the second phosphor film is small. In the above embodiment, the lamp diameter D is set to 2.
Although shown as 0 mm, 2.6 mm, 4.0 mm, and 4.6 mm, it is a matter of course that the same effect can be obtained if the lamp tube diameter D is in the range of 1.5 mm to 6.5 mm.

Further, it has been found that increasing the distance between the discharge lamp 71 and the light guide 64 by 0.2 to 0.4 mm increases the light incidence efficiency. It is desirable that the lamp tube 54 and the irradiation surface 66 be slightly separated from each other than contact. To secure this distance Z, a transparent rubber ring 53 is provided. That is, the role of the transparent rubber ring 53 has two roles of keeping the lamp tube 54 and the irradiation surface 66 apart by a desired distance and protecting the lamp tube 54 from shock or impact. 0.2 mm distance Z
If the lamp tube diameter D at that time is 1.5 mm, the distance Z is 13.3% of the lamp tube diameter D. Further, the distance Z is set to 0.4 mm, and the lamp diameter D at that time is set to 1.5 mm.
mm, the distance Z is 26.6% of the lamp tube diameter D. When the distance Z is 0.2 mm and the lamp diameter D at that time is 6.5 mm, the distance Z is 3.1% of the lamp diameter D. Assuming that the distance Z is 0.4 mm and the lamp tube diameter D at that time is 6.5 mm, the distance Z is 6.2% of the lamp tube diameter D. Thus, it has been found that the distance Z is preferably 3% to 27% of the lamp tube diameter D. Desirably, it is 7% to 20%.

In the above example, the case in which the transparent rubber ring 53 is used has been described. However, instead of the transparent rubber ring 53, a spacer such that the lamp tube 54 is installed at a predetermined distance from the irradiation surface 66 is provided. It does not matter. Further, the shape is not limited to the annular shape, and may be simply a projection shape or a rod shape.

FIG. 9 is a flowchart showing a method for manufacturing a discharge lamp according to the present invention. First, in S41, the reflection film 55 is formed on the lamp tube 54. Reflective film 55
Is formed on the entire inner periphery of the lamp tube 54. Next, S4
In 2, a first fluorescent film 56 is formed inside the reflective film 55. For example, the first phosphor film 56 is formed by applying a phosphor of 4 to 8 mg / cm ² . Thus, the first phosphor film 56 having the thickness U shown in FIG. 2 is formed. The first fluorescent film 56 is formed on the entire inner periphery. Next, in S43, printing is performed. Next, in S44, an opening 58 is formed. Opening 5
Step 8 is performed physically by stripping the reflection film 55 and the first fluorescent film 56 along the axis of the lamp tube 54 in a strip shape. Alternatively, a chemical action such as etching may be used. Next, in S45, a second fluorescent film 57 is formed. For example, if the phosphor is at least 0.5 mg / cm
^{A second} fluorescent film 57 that becomes ² is formed. Thus, the second fluorescent film 57 having the thickness V shown in FIG. 2 is formed. The second fluorescent film 57 is formed on the entire inner circumference.
Then, at 46, printing is performed. Then, similarly to the manufacture of a normal discharge lamp, in S47, exhaust is performed, and in S48, rare gas or mercury is sealed,
In S49, sealing, capping, and the like are performed, the electrode cover 59 is attached, and the discharge lamp is completed.

Embodiment 2 Although not shown, the reflection film 55 may be provided outside the lamp tube 54. Further, the reflection film 55 and the first fluorescent film 56 may be provided outside the lamp tube 54. FIG. 10 shows a case where the cross section of the lamp tube 54 is elliptical. By making the cross section of the lamp tube 54 elliptical, the length in the direction of arrow A can be shortened. Also, since the surface area inside the lamp tube 54 increases,
The amount of the phosphor increases, and the light intensity can be further increased. FIG. 11 shows a case where a straight portion is provided in the cross-sectional shape of the lamp tube 54 and an opening 58 is provided in the straight portion. In the case shown in FIG. 11, the length in the direction of arrow B can be reduced.

In the above embodiment, the case of the discharge lamp used in the backlight device has been described. However, the present invention can be applied to a reading light source for equipment other than the discharge lamp used in the backlight device. It is.
For example, it can be applied to a reading light source of a scanner, a copier, and a facsimile machine. In particular, the discharge lamp according to the present invention is effective for a light irradiation surface having a limited width.

Further, the conventional structure shown in FIGS. 12 and 13 can be applied to the discharge lamp of the present invention.

[0037]

As described above, according to the present invention, effective irradiation can be performed by setting the width Y of the opening 58 at a predetermined ratio with respect to the width X of the irradiation surface 66.

Further, according to the present invention, effective irradiation can be performed without requiring a special component such as a special lamp cover such as a lamp cover.

Further, according to the present invention, no special parts are required around the discharge lamp, so that the size of the apparatus using the discharge lamp can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a discharge lamp 71 of the present invention.

FIG. 2 is a sectional view of a discharge lamp 71 and a backlight device according to the present invention.

FIG. 3 is a diagram showing a relationship between a lamp opening width ratio and a lamp surface luminance.

FIG. 4 is a diagram illustrating a relationship between a lamp opening width and light guide luminance.

FIG. 5 is a diagram showing a case where a width Y of an opening 58 according to the present invention is 55% of a width X of an irradiation surface 66;

FIG. 6 is a diagram showing a case where a width Y of an opening 58 according to the present invention is 75% of a width X of an irradiation surface 66;

FIG. 7 is a view showing a case where the width Y of the opening 58 according to the present invention is 100% of the width X of the irradiation surface 66;

FIG. 8 is a diagram illustrating a temporal change in luminance when the ratio of the width Y of the opening of the discharge lamp 71 to the irradiation surface X is 60%, 75%, and 95%.

FIG. 9 is a diagram showing a method for manufacturing the discharge lamp 71 of the present invention.

FIG. 10 is a view showing another structure of the discharge lamp 71 of the present invention.

FIG. 11 is a view showing another structure of the discharge lamp 71 of the present invention.

FIG. 12 is a diagram showing a conventional lighting device.

FIG. 13 is a diagram showing a conventional lighting device.

[Explanation of symbols]

51 introduction wire, 53 transparent rubber ring, 54 lamp tube, 5
5 reflective film, 56 first fluorescent film, 57 second fluorescent film, 58 opening, 59 cover, 63 LCD, 64
Light guide, 65 reflection sheet, 66 light diffusion sheet, 6
7 lens sheet, 68 irradiation surface, 71 discharge lamp,
D Lamp tube diameter, width of X irradiation surface 68, width of Y opening 58.

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[Procedure amendment]

[Submission date] February 9, 2000 (200.2.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoichi Miyata 2-17-8 Chuo, Ota-ku, Tokyo F-term in Elevum Co., Ltd. 5C028 BB04 5C043 AA02 AA04 BB04 BB09 CC16 CD01 CD13 DD28 DD31 EA14 EC01 EC11

Claims (9)

[Claims] 1. A discharge lamp provided with a reflective film having a strip-shaped opening having a predetermined width, wherein the opening has a width of 55% with respect to the width of an irradiation surface for irradiating light.
A discharge lamp having an opening width of about 100% and a fluorescent film provided inside the reflective film and in the opening. 2. The discharge lamp according to claim 1, wherein the width of the opening is 60% to 95% of the width of the light irradiation surface. 3. The discharge lamp according to claim 1, wherein the thickness of the fluorescent film in the opening is not more than 1/2 of the thickness of the fluorescent film inside the reflective film and larger than 0. . 4. The discharge lamp has a lamp tube diameter of 1.5 m.
The discharge lamp according to claim 1, wherein the distance is from m to 6.5 mm. 5. The discharge lamp according to claim 1, wherein a spacer is provided outside the lamp tube so that the lamp tube is installed at a distance of 3% to 20% of the lamp tube diameter from the irradiation surface. The discharge lamp according to claim 1. 6. A step of forming a reflective film on the entire inner periphery of the lamp tube, a step of forming a first fluorescent film on the entire inner periphery of the reflective film, and connecting the reflective film and the fluorescent film to the lamp tube. A discharge lamp comprising: a step of forming a strip-shaped opening by removing the strip in the axial direction; and a step of forming a second phosphor film on the entire inner periphery of the lamp tube after the formation of the opening. Manufacturing method. 7. The method according to claim 6, wherein an opening width of the opening is 55% to 100% of a width of an irradiation surface on which light is irradiated. 8. The method for manufacturing a discharge lamp according to claim 6, wherein said second phosphor film is formed to have a thickness of not more than 1/2 and greater than 0 than said first phosphor film. 9. The discharge lamp according to claim 1 or claim 6.
An apparatus using a discharge lamp manufactured by the method for manufacturing a discharge lamp according to (1).