KR100417557B1 - An electric discharge lamp, a manufacturing method of an electric discharge lamp, and an apparatus adopting the electric discharge lamp - Google Patents

Abstract

An object of the present invention is to obtain a discharge lamp having a high irradiation efficiency without requiring a dedicated part such as a lamp cover.

With respect to the width X of the irradiation surface 66 of the light guide 64, the width Y of the opening 58 of the discharge lamp 71 is set to 55% to 100%, thereby allowing the LCD from the light guide 64. Increase the intensity of light emitted by (63). A thin second fluorescent film 57 is formed in the opening 58 of the lamp tube 54 by the first fluorescent film 56 and emits light in the opening 58 as well.

Description

DISCHARGE LAMP, MANUFACTURING METHOD AND DEVICE USING THE SAME {AN ELECTRIC DISCHARGE LAMP, A MANUFACTURING METHOD OF AN ELECTRIC DISCHARGE LAMP, AND AN APPARATUS ADOPTING THE ELECTRIC DISCHARGE LAMP}

The present invention relates to, for example, a discharge lamp used for a halo, a read light source for a device, a manufacturing method thereof and a device using the same.

Fig. 12 is a diagram showing a lighting device using a conventional halo disclosed in Japanese Unexamined Patent Publication No. Hei 10-162617.

The liquid crystal display device 1 includes a backlight 4 that combines a pair of left and right light source devices 2 (only one in the drawing) and a light guide unit 3, a flat transmissive liquid crystal display element 5, It is formed by the housing 6 which accommodates and holds these halo 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 the reflective sheet 8, the light guide plate 9, the light diffusion sheet 10, and the lens sheet 11. The light guide plate 9 is formed with an incident surface 12 through which light is incident and a light emitting surface 13 through which the incident light is emitted, and the light diffusion sheet 10 is stacked on the emission surface 13.

The light source device 2 is composed mainly of a conventional cold cathode lamp 14. In the reflective cold cathode lamp 14, a lean gas such as xenon gas is sealed in the glass bulb 15 formed in a cylindrical shape, and a reflective film 16 coated with titanium oxide is formed on the inner circumferential surface thereof. The reflecting film 16 is not formed on the entire inner circumferential surface of the bulb 15 but is substantially missing a 90 ° range, and the missing portion is formed to be thin and long along the axial direction of the bulb 15 to emit light. The opening 17 is opposed to the incident surface 12 of the light guide plate 9 in parallel. In order to increase the incident efficiency of the light exiting from the opening 17 into the light guide plate 9 around the reflective cold cathode lamp 14 and to increase the luminance of the light exiting surface of the halo 4, the lamp cover 18 is provided. Is attached.

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 enters the light guide plate 9 from the opening 17. It is emitted toward the surface 12, and the utilization efficiency of light is high.

Fig. 13 is a diagram similarly showing a lighting apparatus using the conventional halo described in the above publication.

The same parts as those described in FIG. 12 will be described with 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 the left and right pairs of light source devices 20 (only one side in the drawing) and the light guide unit 21 are combined. The back light 22, the flat transmissive liquid crystal display element 5 which is a display part, and the housing 6 which accommodates and hold | maintains these halo 22 and the transmissive liquid crystal display element 5 are formed. The backlight 22 is arrange | positioned at the non-light emitting surface 7 side of the said transmissive liquid crystal display element 5.

The light source device 20 is mainly composed of a reflective cold cathode lamp 14 that is a reflective light source. In the reflective cold cathode lamp 14, a lean gas such as xenon gas is sealed in the glass bulb 15 formed in a cylindrical shape, and a reflective film 16 coated with titanium oxide is formed on the inner circumferential surface thereof. The reflective film 16 is not formed on the entire inner circumferential surface of the bulb 15, but is omitted by approximately 90 degrees, and this missing portion is formed long and thin along the axial direction of the bulb 15 to emit light. It is an opening 17.

The light guide unit 21 is formed by stacking and fixing the reflective sheet 23, the light guide plate 9, the light diffusion sheet 24, and the lens sheet 11. The light guide plate 9 is formed with an incident surface 12 through which light from the reflective cold cathode lamp 14 is incident, and a light emitting surface 13 through which the incident light is emitted, and is formed on the light emitting surface 13. The light diffusion sheet 24 is laminated.

The reflective sheet 23 is formed so that the outer circumferential dimension of the side opposite to the light source device 20 is 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 (lower side in the drawing) along the longitudinal direction of the opening 17 of the reflective cold cathode lamp 14 is covered with this reflective sheet 23. The light diffusion sheet 24 also has an outer circumferential dimension on the side facing the light source device 20 larger than the light guide plate 9 and covers half of the circumference of the reflective cold cathode lamp 14. It extends to a position, and the other (upper side in the figure) along the longitudinal direction of the opening 17 of the reflective cold cathode lamp 14 is covered with this 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 extends toward the light source device 20 rather than the light guide plate 9 in the reflective sheet 23 or the light diffusing sheet 24, deviating from the incident surface 12 of the light guide plate 9. The abutted portion is reflected by being touched, and is reflected into the incident surface 12 after being reflected. Therefore, most of the light emitted from the opening 17 enters the light guide plate 9 from the incident surface 12, and the incident efficiency to the light guide plate 9 is increased. In addition, light incident from the incident surface 12 into the light guide plate 9 is emitted from the light emitting surface 13 of the light guide plate 9, and irradiates the transmissive liquid crystal display element 5 from the non-light emitting surface 7 side. . And since the incidence efficiency to the light guide plate 9 is high, the quantity of light emitted from the light emitting surface 13 increases, the light emission surface brightness of the back light 22 becomes high, and the brightness of the liquid crystal display of the transmissive liquid crystal display element 5 Becomes higher.

In addition, by extending the reflective sheet 23 and the light diffusion sheet 24, the incident efficiency to the light guide plate 9 is increased, or the luminance of the light exiting surface of the back light 22 and the luminance of the liquid crystal display are increased. As a result, the incident efficiency to the light guide plate 9 can be increased, or the luminance of the light exiting surface of the back light 22 and the luminance of the liquid crystal display can be increased without using a special component such as a lamp cover. At the same time, the cost is low.

In the conventional lighting apparatus shown in Fig. 12, a lamp cover 18 is provided to reflect the light emitted in a direction deviating from the incident surface 12 to the lamp cover 18 so as to flow into the incident surface 12. However, there is a problem in that the cost increases because the number of parts increases by using the lamp cover. In addition, there is a problem that the thickness of the lighting apparatus is increased by using the lamp cover 18.

Since the lamp cover 18 is mostly made of metal, leakage current flows, and there is a problem in that the discharge becomes unstable, especially in a cold cathode lamp. In addition, since charges tend to accumulate in the lamp cover, there is a drawback that dirt and the like in the air are adsorbed and contaminated.

In the lighting apparatus shown in Fig. 13, the lamp cover 18 is removed, and instead, the reflection sheet 23 and the light diffusion sheet 24 are extended to reflect the light emitted in a direction deviating from the incident surface 12. In order to flow into the incident surface 12, there is a problem that the reflective sheet 23 and the light diffusion sheet 24 need to be extended. Moreover, there exists a problem of increasing the thickness of a lighting apparatus.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a discharge lamp in which the irradiation efficiency of light is improved with respect to the irradiation surface for irradiating light such as the incident surface of the light guide plate.

It is also an object of the present invention to provide a discharge lamp which is inexpensive because there is no need for a dedicated part such as a lamp cover and which has no unstable occurrence of discharge or contamination of the lamp.

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

2 is a cross-sectional view of the discharge lamp and the backlight device of the present invention.

Fig. 3 is a diagram showing a relationship between a lamp aperture width ratio and a lamp surface luminance.

4 is a diagram showing a relationship between lamp aperture width and light guide luminance.

Fig. 5 shows the case where the width of the opening of the present invention is 55% of the width of the irradiation surface;

Fig. 6 shows the case where the width of the opening of the present invention is 75% of the width of the irradiation surface;

Fig. 7 shows the case where the width of the opening of the present invention is 100% of the width of the irradiation surface;

Fig. 8 is a diagram showing the time change of luminance when the ratio of the width of the opening of the discharge lamp of the present invention to the irradiation surface of 60%, 75%, 95%.

9 is a view showing a method of manufacturing the discharge lamp of the present invention.

Fig. 10 shows another structure of the discharge lamp of the present invention.

Fig. 11 shows another structure of the discharge lamp of the present invention.

12 illustrates a conventional lighting device.

Fig. 13 shows a conventional lighting device.

<Explanation of symbols for the main parts of the drawings>

51: lead line

53: transparent rubber ring

54 lamp tube

55: reflecting film

56: first fluorescent film

57: second fluorescent film

58: opening

59: cover

63: LCD

64: light guide

65: reflective sheet

66: light diffusion sheet

67: lens sheet

68: irradiation surface

71: discharge lamp

D: lamp tube diameter

X: width of irradiation surface

Y: width of opening

The discharge lamp according to the present invention includes a reflective film having a strip-shaped opening having a predetermined width,

The opening has an opening width of 55% to 100% with respect to the width of the irradiation surface for irradiating light, and is preferably characterized in that the width of 60% to 95%.

The discharge lamp includes a fluorescent film inside the reflecting film and the opening, and the thickness of the fluorescent film in the opening is equal to or less than 1/2 the thickness of the inner fluorescent film of the reflecting film, preferably 1/2 to 1/8 of the thickness. It is characterized by one.

The discharge lamp is characterized in that it comprises a transparent spacer on the outside of the lamp tube so that the lamp tube surface is spaced apart from the irradiation surface by a distance of 3% to 20% of the lamp tube diameter.

The manufacturing method of the discharge lamp which concerns on this invention is a process of forming a reflecting film in the whole inner periphery of a lamp tube,

Forming a first fluorescent film in the entire inner circumference of the reflective film;

Removing the reflective film and the fluorescent film in a belt shape in the axial direction of the lamp tube to form a band opening;

And forming a second fluorescent film on the entire inner circumference of the lamp tube after the opening is formed.

The opening width of the opening is characterized in that the width of 55% to 100%, preferably 60% to 95% of the width of the irradiation surface for irradiating light.

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

<First Embodiment>

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

The discharge lamp 71 has a lamp tube 54. The lamp tube 54 is a glass tube, and the lamp tube diameter (outer diameter) produced four types of 2.0 mm, 2.6 mm, 4.0 mm, and 4.6 mm. Hereinafter, the diameter (outer diameter) of the lamp tube 54 is called lamp tube diameter (D). Electrode covers 59 are provided at both ends of the lamp tube 54. The electrode cover 59 is a cover which covers the harness part which connects the lead wire 51 and the electrode which is not shown in figure. In addition, the lamp tube 54 is formed with an opening 58 for emitting light formed in a band shape along the axial direction of the lamp tube 54. Moreover, the transparent rubber ring 53 is provided in several parts around the lamp tube 54. As shown in FIG. The transparent rubber ring 53 is made of a material such as transparent silicone rubber, transparent plastic, or transparent acrylic.

FIG. 2 is a view showing an A-A cross-sectional view of the discharge lamp 71 shown in FIG. 1 and a backlight device to which the discharge lamp 71 is attached.

Inside the lamp tube 54, a reflective film 55 coated with titanium oxide is formed. A portion from which the reflective film 55 is removed in a band shape is an opening 58. The first fluorescent film 56 and the second fluorescent film 57 are formed inside the lamp tube 54. The first fluorescent film 56 is not formed in the opening 58, but the second fluorescent film 57 is formed inside the reflective film 55 and the opening 58.

The backlight device is comprised by the light guide 64, the reflection sheet 65, the light-diffusion sheet 101, the lens sheet 102, and the color filter 103. As shown in FIG. In addition, an LCD (liquid crystal display device) 63 is provided on the light exiting side of the light guide 64.

Next, the operation will be described.

When the discharge lamp 71 is turned on, the phosphors in the first fluorescent film 56 and the second fluorescent film 57 emit light to emit light. The characteristic feature here is that since the second fluorescent film 57 is formed in the opening 58, the light is emitted in the opening 58 and the emitted light is emitted. If there is no second fluorescent film 57 in the opening portion 58, light emission in the opening portion 58 is not performed at all, and brightness cannot be improved. However, when the second fluorescent film 57 is thick, the intensity of light passing through the portion is weakened. Therefore, the thickness of the second fluorescent film 57 is larger than that of the other fluorescent films. When 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 of the opening 58 is V, but the thickness of the fluorescent film formed on the inner circumference of the reflective film 55 is The thickness is U + V = W. The thickness of the fluorescent film of the opening 58 is 1/2 or less of the thickness of the fluorescent film of the reflecting film 55 and is preferably greater than zero, preferably from 1/2 to 1/8.

Light generated from the fluorescent film is reflected by the reflecting film 55 to irradiate the irradiation surface 66 at the end of the light guide 64. The width | variety to which the light of the irradiation surface 66 at the edge part of the light guide 64 is irradiated is called width X of the irradiation surface 66 hereafter. In addition, the opening width which the light of the opening part 58 emits is called the width Y of the opening part 58 hereafter. In the case where the width X of the irradiation surface 66 is 100%, the width Y of the opening 58 is preferably 55% to 100%, preferably 60% to 95%. Below, the reason is demonstrated.

Fig. 3 uses discharge lamps 71 having lamp tube diameters D of 2.0 mm, 2.6 mm, 4.0 mm, and 4.6 mm, and the thicknesses of the fluorescent films of these lamps are matched, and the lamp tube diameter D is matched. It is a figure which shows the characteristic at the time of lighting the discharge lamp 71 by the same current density.

In Fig. 3, the horizontal axis represents the lamp aperture width ratio. The lamp aperture width ratio indicates the value of the aperture width when the aperture width of 1/2 of the lamp tube diameter D is set to 100%, that is, the aperture width having the same length as the radius. That is, in FIG. 2, the case where the width | variety of the opening part 58 is Y = D / 2 is set as opening width ratio = 100%. In FIG. 3, the vertical axis represents the lamp surface luminance ratio of the opening 58. As shown in FIG. Also in the vertical axis, the luminance value in the case where the lamp surface luminance in the case of Y = D / 2 is set to 100% is shown. The value shown in FIG. 3 has shown the average value at the time of measuring by changing four types of lamp tube diameters D. FIG. It can be seen from FIG. 3 that the smaller the lamp aperture width ratio is, the higher the lamp surface luminance rate becomes. According to Fig. 3, the smaller the width Y of the opening 58 shown in Fig. 2, the higher the luminance of light incident on the light guide 64 is. Then, the value of the width Y of the opening part 58 was changed next, and the brightness of the light actually emitted from the light guide 64 was measured. The result is shown in FIG.

4 is a diagram showing the relationship between the lamp aperture width and the light guide luminance.

In FIG. 4, the horizontal axis represents the lamp aperture width ratio with respect to the thickness of the light guide 64. As shown in FIG. 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 represents the brightness of light emitted from the light guide surface on which the light guide 64 and the LCD 63 are in contact. 100% in the vertical axis means the luminance of light emitted from the light guide surface when a discharge lamp is used when there is no opening 58 in the lamp, that is, when the fluorescent film is applied to the entire inner circumference of the lamp. Indicates. The characteristic shown in FIG. 4 is measured by separating the light guide 64 and the discharge lamp 71 from 0.2 to 0.4 mm. Moreover, when the thickness of the light guide 64 was 2 mm, the case where the lamp tube diameter D was 2 mm and 2.6 mm was tested. Moreover, when the thickness of the light guide 64 was 4 mm, the case where the lamp tube diameter D was 4 mm and 4.6 mm was tested. The test was conducted 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 Y of the surface of the light guide body is greater than 100% so that the width Y of the opening 58 is in the range of about 55% to 100% of the width X of the irradiation surface 66. . The luminance is increased when the width Y of the opening 58 is 60% to 95% of the width X of the irradiation surface 66. In particular, 70% to 80% is the highest luminance. FIG. 5 shows the case where the width Y of the opening 58 is 55% of the width X of the irradiation surface 66. FIG. 6 shows the case where the width Y of the opening 58 is 75% of the width X of the irradiation surface 66, and the case where the luminance of the surface of the light guide 64 is the highest. . FIG. 7 shows the 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 has a value of any one of 55% to 100%, and preferably 60% to 95% of the width X of the irradiation surface 66, thereby providing a reflective film ( The light reflected by 55 may irradiate the irradiation surface 66 efficiently to emit light of high brightness from the light guide 64.

According to the characteristics shown in Fig. 3, the smaller the width Y of the opening 58 is, the higher the brightness of the lamp surface is. Therefore, it is thought that efficient irradiation can be performed on the irradiation surface 66. As shown in FIG. 4, the light having high brightness is selected by selecting the size of the width Y of the opening 58 according to the thickness of the light guide 64, that is, the size of the width X of the irradiation surface 66. It could be obtained. In the prior art, attention was paid to the ratio of the width X of the irradiation surface 66 to the width Y of the opening 58, and there was no intention of increasing the luminance of light emitted from the light guide 64. The present invention is characterized in that a high luminance light is obtained based on the ratio of the width X of the irradiation surface 66 to the width Y of the opening 58.

The feature of the present invention is that the second fluorescent film 57 is formed. In addition, the second fluorescent film 57 is characterized in that it is made thinner than the first fluorescent film 56. By forming the opening 58 and then forming the second fluorescent film 57 in the entire inner circumference, a thin fluorescent film is formed in the opening 58. If the second fluorescent film 57 is not formed in the opening 58, light emission in the opening 58 is not performed at all. In addition, since the opening 58 is exposed, it is easily cooled, and contaminants such as mercury oxide, carbon compound, and the like generated by reacting trace amounts of oxygen, moisture, and mercury generated inside the lamp tube 54 by lighting, and the opening ( 58 tends to concentrate, deteriorating the transmittance of light. In other words, the brightness cannot be maintained. The formation of the second fluorescent film 57 prevents contaminants on the inner surface from approaching the openings 58 and increases the amount of light emitted by allowing the openings 58 to emit light.

Fig. 8 shows the time of luminance of a lamp created with the width Y of the opening portion 60%, 75% and 95% of the width of the irradiation surface 66 for the discharge lamp having a thinly formed second fluorescent film as a feature of the present invention. Shown the change. In the figure, for comparison, the characteristics of the lamp with the opening width of 75% and no formation of the second fluorescent film are shown together. 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 brightness can be maintained by a 2nd fluorescent film is clear. In addition, the tube diameter D of these lamps is 2.6 mm.

If the thickness of the second fluorescent film 57 is too thick, the transmittance of light from the opening 58 is lowered. Therefore, the second fluorescent film 57 is preferably thinner. The thickness of the first fluorescent film 56 is formed by applying 4 to 8 mg / cm 2 of the phosphor, and the thickness of the second fluorescent film 57 is formed by applying at least 0.5 mg / cm 2. The thickness of the second fluorescent film 57 is 1/2 or less, preferably 1/2 to 1/8 of the thickness of the first fluorescent film. When the thickness is larger than 1/2, the transmittance of light is lowered, and when it is thinner than 1/8, the contribution of light emission from the second fluorescent film is reduced. In addition, in the above embodiment, the tube diameter (D) of the lamp is presented as 2.0 mm, 2.6 mm, 4.0 mm, 4.6 mm, but the same effect can be obtained if the lamp tube diameter (D) is in the range of 1.5 mm to 6.5 mm. Of course.

In addition, it has been found to increase the incident efficiency of light by separating the discharge lamp 71 from the light guide 64 by 0.2 to 0.4 mm. It is more preferable to space apart rather than to contact the lamp tube 54 and the irradiation surface 66. FIG. In order to secure this distance Z, the transparent rubber ring 53 is provided. That is, the role of the transparent rubber ring 53 is to separate the lamp tube 54 and the irradiation surface 66 by a desired distance, and also serves to protect the lamp tube 54 from shock or impact.

If the distance Z is 0.2 mm and the lamp tube diameter D at that time is 1.5 mm, the distance Z is 13.3% of the lamp tube diameter D.

If the distance Z is 0.4 mm and the lamp tube diameter D at that time is 1.5 mm, the distance Z is 26.6% of the lamp tube diameter D.

Moreover, when distance Z is 0.2 mm and lamp tube diameter D at that time is 6.5 mm, distance Z will be 3.1% of lamp tube diameter D.

If 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.

As a result, it was found that the distance Z is preferably 3% to 27% of the lamp tube diameter D. Preferably from 7% to 20%.

Although the case where the transparent rubber ring 53 is used in the above example was shown, instead of the transparent rubber ring 53, even if the lamp tube 54 is provided with the spacer spaced apart by the predetermined distance from the irradiation surface 66, Does not matter. Moreover, it is not limited to an annular thing and may be a protrusion thing and a rod thing.

9 is a flowchart showing a method of manufacturing the discharge lamp of the present invention.

First, the reflective film 55 is formed in the lamp tube 54 in S41. The reflective film 55 is formed over the entire inner circumference of the lamp tube 54. Next, the first fluorescent film 56 is formed inside the reflective film 55 in S42. For example, the first fluorescent film 56 is formed by applying a phosphor of 4 to 8 mg / cm 2. In this manner, a first fluorescent film 56 having a thickness U shown in FIG. 2 is formed. This first fluorescent film 56 is formed over the entire inner circumference. Next, baking is performed in S43. Next, the opening 58 is formed in S44. The opening 58 is physically performed by removing the reflective film 55 and the first fluorescent film 56 in a band shape along the axis of the lamp tube 54. Or you may use chemical effects, such as etching. Next, a second fluorescent film 57 is formed in S45. For example, the second fluorescent film 57 is formed such that the phosphor is at least 0.5 mg / cm 2. In this manner, a second fluorescent film 57 having a thickness V shown in FIG. 2 is formed. The second fluorescent film 57 is formed over the entire inner circumference. Then, the baking is performed in S46. Thereafter, in the same manner as in the manufacture of a normal discharge lamp, the exhaust gas is exhausted in S47, the lean gas, the mercury, etc. are sealed in S48, the seal, the mouth-piece attachment, etc. are performed in S49, and an electrode cover. (59) is attached to complete the discharge lamp.

<2nd embodiment>

Although not shown, the reflective film 55 may be formed outside the lamp tube 54. In addition, the reflective film 55 and the first fluorescent film 56 may be formed outside the lamp tube 54.

10 shows a case where the cross section of the lamp tube 54 is an ellipse.

By making the cross section of the lamp tube 54 an ellipse, the length of the arrow A direction can be shortened. In addition, since the surface area inside the lamp tube 54 increases, the amount of the phosphor increases, so that the intensity of light can be further increased.

FIG. 11 shows a case where a straight portion is formed in the cross-sectional shape of the lamp tube 54 and an opening 58 is formed in the straight portion.

In the case shown in Fig. 11, the length in the direction of the arrow B can be reduced.

Moreover, in the said embodiment, although the case of the discharge lamp used for a halo apparatus is shown, this invention is applicable to the reading light source for apparatuses etc. other than the discharge lamp used for a halo apparatus. For example, it can be applied to a reading light source of a scanner, a copier or a facsimile device. In particular, the discharge lamp of the present invention is effective in that the width of the irradiation surface for irradiating light is limited.

It is also possible to apply the conventional structures shown in Figs. 12 and 13 to the discharge lamp of the present invention.

As mentioned above, according to this invention, effective irradiation can be performed by making the width | variety Y of the opening part 58 into a predetermined ratio with respect to the width | variety X of the irradiation surface 66. FIG.

Moreover, according to this invention, effective irradiation can be performed, without requiring a special component, such as a special lamp cover.

Further, according to the present invention, since no special parts are required around the discharge lamp, the size of the device in which the discharge lamp is used can be made small.

Claims (11)

It is a discharge lamp provided with the reflecting film which has the strip | belt-shaped opening part which has a predetermined width | variety Y, and irradiates the irradiation light emitted from the said opening part with respect to the irradiation surface which has the predetermined | prescribed width X of an irradiation target object, The opening has an opening width of 55% to 100% with respect to the width X of the irradiation surface to irradiate the irradiation light, A fluorescent film is provided on the inside of the reflective film and the opening, and the fluorescent film of the opening is formed by applying at least 0.5 mg / cm ² of a phosphor, and the thickness of the fluorescent film of the opening is 1/2 of the thickness of the fluorescent film inside the reflective film. The discharge lamp characterized in that less than 1/8 or more thickness. The discharge lamp of claim 1, wherein the opening width is 60% to 95% of the width of the irradiation surface to which light is irradiated. delete The discharge lamp of claim 1, wherein the lamp tube diameter of the discharge lamp is 1.5 mm to 6.5 mm. The discharge lamp of claim 1, wherein the discharge lamp includes a spacer on an outer side of the lamp tube such that the lamp tube is spaced apart from the irradiation surface by a distance of 3% to 20% of the lamp tube diameter. Forming a reflective film over the entire inner circumference of the lamp tube; Forming a first fluorescent film in the entire inner circumference of the reflective film; A strip-shaped opening having a opening width Y of 55% to 100% with respect to the width X of the irradiation surface for irradiating the irradiation light by removing both the reflective film and the fluorescent film in a band shape in the axial direction of the lamp tube at the same time. Forming process, After the formation of the opening, at least 0.5 mg / cm ² or more of phosphor is applied to the entire inner circumference of the lamp tube so that the thickness of the fluorescent film of the opening is less than 1/2 of the thickness of the reflective film inside the reflective film and is equal to or greater than 1/8 of the thickness of the reflective film. The manufacturing method of the discharge lamp characterized by including the process of forming a fluorescent film. delete delete delete An apparatus comprising the discharge lamp according to claim 1. The discharge lamp manufactured by the manufacturing method of the discharge lamp of Claim 6 was used.