JPS63146342A - Fluorescent lamp device - Google Patents

Abstract

PURPOSE:To improve radiation efficiency by removing phosphor film's part not closely facing an irradiated surface so that apertures are formed and sticking a reflective film on a fixed inner peripheral surface of a bulb. CONSTITUTION:A positive column and a phosphor film 12e inside a bulb 12a are excited to become luminous. Almost all of these lights are radiated outside from the periphery of respective linear parts 12c and 12d. However, part of these lights are reflected and dispersed on respective reflective films 15a and 15b and then guided outside through respective apertures 14a and 14b and next directly radiated on the outside edge part of the irradiated surface 13. Lights radiated toward the reflective films 15a and 15b, and the lights, which are generated inside the bulb 12a and radiated toward the apertures 14a and 14b, are reflected and diffused there and added to the lights guided outside through the apertures 14a and 14b, so that light output power of them is enlarged. Therefore, illumination of the outside edge part of the irradiated surface 13 is upgraded by these lights which are enlarged in output power and guided through apertures.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a fluorescent lamp device suitable for backlighting of liquid crystal displays, etc., and particularly relates to a fluorescent lamp device coated with a reflective film. , relates to a fluorescent lamp device with improved irradiation efficiency.

(Prior Art) Conventionally, this type of fluorescent lamp device has been developed as a so-called backlight for illuminating an illuminated object such as a liquid crystal display of a liquid crystal television from the back side, and is shown in FIGS. 10 and 11. A small U-shaped bent fluorescent lamp 2 is placed horizontally on the inner bottom surface 1a of the reflecting plate 1 which is bent into a flat U-shape.

A plate-shaped direct light attenuation filter 3 and an illuminated surface such as a liquid crystal display are disposed in this order on the light exit 1b of the upper opening of the reflection plate 1. By attenuating the direct light from the illumination target, the illuminance distribution on the illuminated surface of the illuminated object is flattened.

However, when the direct light neutral density filter 3 is not interposed, the illuminance distribution of the illuminated surface, in other words, when a light diffusing plate is placed below the illuminated surface, the light that passes through this diffuser plate The brightness distribution is as shown in the characteristic curve in FIG.
It shows bimodality with relative brightness peaks at the center), and the illuminance distribution on the illuminated surface is not flattened.

Therefore, the direct light at the point where the relative brightness of the illuminated surface does not show a peak is attenuated by the direct light attenuation filter 3, and the peak is flattened. The aim is to flatten the illuminance distribution with the outer edge.

(Problems to be Solved by the Invention) However, in such a conventional fluorescent lamp device, the direct light irradiated from the fluorescent lamp 2 to the center of the illuminated surface is attenuated by the direct light attenuation filter 3. Since the illuminance distribution is flattened, there is a problem in that the brightness of the fluorescent lamp device as a whole is reduced.

Furthermore, as shown in FIG. 11, since the lower surface (bottom wall) of the fluorescent lamp 2 faces the inner bottom surface 1a of the reflector 1, direct light emitted downward from the lower surface of the fluorescent lamp 2 is Although it is reflected by the inner bottom surface 1a of the reflector 1, this reflected light is blocked by the fluorescent lamp 2 itself and hardly illuminates the illuminated surface above the fluorescent lamp 2, so that the lower surface of the fluorescent lamp 2 is Become a shadow.

Therefore, some of the light emitted from the lower surface of the fluorescent lamp 2 cannot contribute to increasing the illuminance of the illuminated surface, and there is a problem that the irradiation efficiency of the fluorescent lamp device as a whole is low.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fluorescent lamp device with good irradiation efficiency that can flatten the illuminance distribution on an illuminated surface with a simple configuration.

[Structure of the invention]

(Means for Solving the Problems) The present invention solves the problems of the conventional example, in that the radiation is emitted from the lower surface (bottom wall) of the fluorescent lamp opposite to the inner bottom surface of the reflector, and is reflected by the inner bottom surface of the reflector. This was done by focusing on the fact that the diffused reflected light is blocked by the fluorescent lamp itself, and is constructed as follows.

That is, the present invention provides a fluorescent lamp device in which a fluorescent lamp having a phosphor film coated on the inner circumferential surface of the bulb is housed in a reflecting plate, and the reflecting plate reflects light from the fluorescent lamp onto a surface to be illuminated. For the fluorescent lamp, remove the phosphor film in areas that do not closely face the illuminated surface to create an aperture 1? In addition to opening the aperture, a reflective film is coated on the inner circumferential surface of the bulb at locations other than the opening location of the aperture and the location closely opposing the illuminated surface.

(Function) When the fluorescent lamp is turned on, the illuminated surface is directly irradiated with direct light from the fluorescent lamp, and the diffused reflected light reflected by the reflector plate is irradiated onto almost the entire surface of the illuminated surface.

A part of the light generated inside the fluorescent lamp is led out of the bulb of the fluorescent lamp through the aperture, but this led light includes the light emitted inside the bulb and the light emitted toward the 7th vertier. On the other hand, the output is increased because reflected light that is emitted toward the reflective film inside the bulb, reflected and diffused by the reflective film is added.

On the other hand, the light emitted outward from the outer peripheral surface of the phosphor film is due to the reduction in the area of the phosphor film covered by the fluorescent lamp due to the opening area of the aperture, and the reaction to the increase in the output of the light extracted from the aperture. It is reducing the output.

Therefore, the irradiated surface in areas that closely face the fluorescent lamp is mainly irradiated with light with reduced output from the phosphor film, reducing the illuminance, while the irradiated surface in areas that do not closely face the fluorescent lamp is irradiated with light with reduced output from the phosphor film. Since the light with increased output from the fluorescent lamp is irradiated, the peak of the illuminance distribution on the illuminated surface is lowered, while the low illuminance area is increased, reducing the disparity between the two, and reducing the area close to the fluorescent lamp. The illuminance distribution of the illuminated surface can be flattened with respect to the areas that are not illuminated.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 9. In addition, in FIG. 1-FIG. 9, it is common. The same parts are given the same reference numerals.

FIG. 1 shows the overall configuration of a first embodiment of the present invention, and shows an inner bottom surface 11 of a reflecting plate 11 bent into a flat U-shape.
For example, a small fluorescent lamp 12 bent into a substantially U-shape is fixed in a horizontal position with a slight gap set above a.

As shown in FIGS. 1 and 2, the reflecting plate 11 is bent into a substantially flat U-shape, and has outwardly convex curved side walls 11b and 11c on both left and right sides of a roughly flat inner bottom surface 11a. For example, an illuminated surface 13 of a light diffusing plate is disposed at the light exit 11d of the upper opening of the reflecting plate 11.

The illuminated surface 13 indicates the back surface of a light diffusing plate that illuminates the back surface of an illuminated object such as a liquid crystal display (not shown).
It is arranged above and close to the upper surface of the fluorescent lamp 12.

The fluorescent lamp 12 is, for example, a straight glass bulb 12a.
is bent into a substantially U-shape, and each straight portion 12c, 12 is integrally connected to both ends of the U-shaped bent end portion 12b.
d are arranged in parallel to face each other along the width direction of the reflecting plate 11.

These straight parts 12c and 12d are formed on the curved side 11 of the reflecting plate 11.
1b, 11c, and are arranged substantially parallel to the reflective surfaces that are the inner surfaces of the electrodes 1b and 11c, facing each other over almost the entire length, and the U-shaped bent end portion 12b and each electrode sealing end portion i2f of each of the straight portions 12c and 12d. ,
1? ) is supported and fixed on the bottom plate of a case (not shown) that houses the reflector 11.

Further, the fluorescent lamp 12 has a phosphor 11u1 made of phosphor almost all around the inner wall of the bulb 12a and over the entire length.
2e, a small amount of mercury and a rare gas such as argon is sealed inside at a predetermined pressure, and electrodes (not shown) are sealed at both ends of the C1 bulb 12a, and each 7I! The poles are electrically connected to a lighting circuit (not shown).

Then, as shown in FIGS. 2 and 3, the fluorescent lamp 1
The outer circumferential walls of the two straight portions 12c and 12d of No. 2, that is, the outer circumferential walls facing the respective concave arc surfaces of the curved side walls 11b and 11C of the reflecting plate 11, and are adhered at the upper inner circumference thereof. Almost the entire length of each phosphor film 12e is removed to a required width to expose the inner circumferential surface of the glass to form an aperture 14a for guiding light.

14b have the same opening, and these apertures p14a, 1
4b is opened toward the outer edge of the illuminated surface 13.

In addition, with respect to these apertures 14a and 14b, the phosphor film 12e of each straight portion 12C112d facing in the bulb diameter direction has a required width and extends over almost the entire length in the axial direction of each straight portion 12C and 12d. The removed portions are coated with coatings 15a and 15b made of a light-reflecting material such as aluminum oxide, antimony oxide, titanium oxide, etc., respectively.

In other words, the reflected light emitted from the lower surface of each of the straight portions 12c and 12d and reflected by the inner bottom surface 11a of the reflecting plate 11 is blocked by the lower surface of each of the straight portions 12G and 12d, so that it is not a shadow. Reflective films 15a and 15b are provided at and around the locations where
has been set up.

In other words, each of the reflective films 15a and 15b is applied in an arc shape to the inner periphery of the bulb on the opposing surface of the adjacent straight parts 12c and 12d, which faces the inner wall surface 11a of the reflecting plate 11. In addition, midpoints S located at positions equally divided in the circumferential direction in the arcuate cross sections of each of the reflective films 15a and 15b are directed toward the inner court surface 11a of the reflective plate 11, respectively.

As shown in FIG. 3, each arc-shaped reflective film 15a,
The central angle OA of 15b is set to approximately 90°.

Each reflection 1!15a, 15b is a straight part 12c.
, 12d, a pair of straight portions 12c, 1
2d is expanded to a width of approximately 90° at the central angle toward the opposing surfaces.

For this reason, a part of the light emitted within each straight portion 12C, 12d is reflected by each reflective film 15a, 15b, and intensively led out from each of the seven pertiers 14a, 14b.
The outer edge of the illuminated surface 13 is irradiated directly.

Therefore, most of the emitted light that is emitted within each of the straight parts 12c and 12d and is about to be emitted toward the inner bottom surface 11a of the reflecting plate 11 is reflected by the reflecting films 15a and 15b, respectively, so that the fluorescent lamp 12 itself is Almost no light is irradiated onto the shaded areas.

Also, anti-rJ4M! A part of the reflected light that is T-reflected and diffused by the apertures 15a and 15b is added to the outgoing light led out from each aperture 14a and 14b, so that this outgoing light is increased.

That is, the reflective film 15a reflects the radiation emitted toward the so-called shadow part of the fluorescent lamp 12 itself.

15b and led out from each of the seven pertiers 148.14b, and the guided light can be irradiated onto the illuminated surface 13, so that the illuminance of the illuminated surface 13 at a location not close to the fluorescent lamp 12 can be increased.

Next, the operation of this embodiment will be described.

When a pair of electrodes of the fluorescent lamp 12 are energized by a lighting circuit (not shown), a discharge occurs between the electrodes, and the bulb 12a
A pillar of sunlight appears inside.

This positive column excites the phosphor film 12e to emit light, and most of the light emitted is radiated outward from the outer periphery of each straight portion 12c, 12d, but a portion of the light emitted is emitted from each reflective film 15a, 15b.
After being reflected and diffused at each averte t14a, 14
The light is led out from b and directly irradiates the outer edge of the illuminated surface 13. The light emitted from these apertures 14a, 14b is emitted within the bulb 12a, and the light is emitted from the apertures 14a, 14.
Since the light radiated toward the reflective film 15a and 15b is reflected and diffused here, the output is increased.

Therefore, the aperture 14a which increases this output,
The illuminance of the outer edge of the illuminated surface 13, which is directly irradiated with the light emitted from the illumination surface 14b, is increased.

In addition, the portions of the illuminated surface 13 that are close to the upper surface of each of the straight portions 12c and 12d are close to the light source, and thus are places that are conventionally exposed to high illuminance.

However, the apertures 14a, 14b and the reflective films 15a, 1
Due to the reduction in the area covered by the phosphor film due to the arrangement of the phosphors 1112e and 1112b and the reaction to the increase in the light emitted from each aperture 14a and 14b, the reflected light emitted outward from the outer periphery of the phosphors 1112e and 12e is Since each straight portion 12C, 12d
Illuminance at a location close to the illuminated surface 13 close to the upper surface is reduced, bimodal peaks are suppressed, and the illuminance distribution as a whole of the illuminated surface 13 is substantially flattened.

In other words, the illuminance distribution of the illuminated surface 13, in other words, the relative brightness distribution of the light from the fluorescent lamp 12 that passes through the diffuser plate with the illuminated surface 13 as the back surface, is as shown in characteristic curve B in FIG. The distribution is almost flat in the radial direction of the fluorescent lamp 12, and the illuminated surface 13 is directly illuminated without going through the conventional direct light attenuation filter 3 shown in FIGS. 10 and 11. It is possible to increase the illuminance of 13.

In addition, the light inside the bulb 12a that is emitted toward the shadowed area on the lower surface of each of the straight portions 12c and 12d is opposite to 1).
1m! Reflected by 15a and 15b. A portion of the reflected light is diffused and reflected from the apertures 114a and 14b to the illuminated surface 13.
Therefore, in this embodiment, the relative brightness of the fluorescent lamp device as a whole, that is, the luminous efficiency can be increased compared to the conventional example.

FIG. 5 shows a cross section of the second embodiment of the present invention when the axially intermediate portion is cut along the direction perpendicular to the axis. The feature is that the left and right straight portions 12C and 12d of 12 are opened laterally on the outer surface thereof.

In other words, the left and right curved side walls 11b of the reflecting plate 11.

The phosphors 11112e and 12e2 on the inner circumferential surfaces of the outer circumferential walls of the straight portions 12C and 12d of the fluorescent lamp 12 facing the reflective surfaces (inner surfaces) of the fluorescent lamps 11C, respectively, are removed to a required width over almost the entire length in the axial direction. , a pair of apertures 1ν14a
2.14b2 is opened.

Furthermore, the bottom walls of the straight portions 12c and 12d of the fluorescent lamp 12 facing the inner bottom surface 11a of the reflector 11, and the inside of the substantially lower half of the inner circumferential wall where the straight portions 12c and 12d face each other. The phosphor films 12e, 12e, .
5a and 15b2 are coated almost entirely.

, Therefore, each straight portion 12C912 of the fluorescent lamp 12
A portion of the light emitted within d is transmitted to each aperture 14a2.14.
b2 to the outside of the bulb, but a part of the reflected light reflected and diffused by each of the reflecting films 15a and 15b2 is added to this led light, so that each of the seven pertiers 14a,
The output of the light guided out of the bulb from 14b2 is increased.

In addition, light is emitted within each straight portion 12c, 12d, and the reflection plate 1
Most of the light emitted toward the inner bottom surface 11a of the fluorescent lamp 11 is reflected by the reflections 115a, 15, and b2, respectively, so that the shadow portion of the fluorescent lamp 12 is hardly irradiated, and the illuminance of the illuminated surface 13 decreases. Most of the radiation that does not contribute to close-up is cut out.

On the other hand, the phosphor films 12e2, 1 of each straight portion 12c, 12d
The synchrotron radiation emitted from the outer circumference of 2e/2 is the aperture t14.
a, 14b2 and the reflective film 1582° 15b2, which reduces the area covered by the phosphor film, and each aperture 14a.
2. The output is reduced due to the reaction of the increase in the output light from 14b2, and the illuminance of the illuminated surface 13 that closely opposes the upper surface of each straight portion 12c and 12d is reduced, suppressing the bimodal peak. be done.

For this purpose, seven barges 14a, 14b, each.

The light guided out of the bulb 12a is reflected and diffused by the left and right curved side walls 11b and 11C of the reflection plate 11, increasing the illuminance at the outer edge of the illuminated surface 13, while each straight portion Illuminated surface 1 closely facing 12C and 12d
Since the illuminance at the center of 3 is reduced, the illuminance distribution on the illuminated surface 13 is almost flattened.

FIG. 6 shows a cross section when the axially intermediate portion of the third embodiment of the present invention is cut along the direction perpendicular to the axis. IFJ15a
, the upper end of 15b2 is made slightly longer than the reflective film 15a.
, 15b3, respectively, and this extended reflection I! The inner peripheral surface of J15a3゜15b3 is coated with a phosphor film on almost the entire circumference, and the phosphor WA12e, 12e
It is characterized by extending 3.

Therefore, according to this embodiment, in addition to achieving almost the same effects as the second embodiment, each reflective film 15a3, 15b3
Increasing the amount of light reflected from the extension valve and each phosphor WA12e
, 12e3 can increase the amount of light emitted from the extension valves, and therefore, the illuminance of the illuminated surface 13 can be increased.

FIG. 7 shows a cross section of a fourth embodiment of the present invention when the axially intermediate portion is cut along the direction perpendicular to the axis, and in this embodiment, the shape of the axial cross section of the valve 12a is rectangular. did(
The present invention is applied to a )-shaped fluorescent lamp 12α.

That is, in this embodiment, the axial cross section of the bulb 12 is rectangular, and the outer peripheral wall of each straight portion 12c, 12d of the U-shaped fluorescent lamp 12α, which is bent into a U-shape, that is, the reflector Inner surfaces (reflective surfaces) of the left and right curved side walls 11b and 11C of 11
Seven perchers 14a are provided on the inner circumferential surface of the outer circumferential wall facing the
14b4 are each opened.

Further, reflective films 15a4, 15b4 are continuously coated on the inner peripheral walls of the straight portions 12c and 12d, which face each other, and the bottom wall of the reflective plate 11, which faces the inner wall 11a. , Furthermore, these reflections FJ15a, 15b
Fluorescent materials 1112e and 12e4 are continuously adhered to substantially the entire length of the inner circumferential surface of the upper wall 4 and to the inner circumferential surface of the upper wall that closely opposes the illuminated surface 13.

Therefore, this embodiment also achieves almost the same effect as the third embodiment shown in FIG. In this case, the brightness distribution can be flattened.

In addition, in each of the above embodiments, the U-shaped fluorescent lamp 12.12
Although the present invention has been described in the case where the present invention is applied to α, the present invention is not limited to this. For example, as in the fifth and sixth embodiments shown in FIGS. The present invention can also be applied to a fluorescent lamp device in which the fluorescent lamps 2OA and 20B are accommodated in the reflector plate 11, 30, respectively.

That is, in the fifth embodiment, as shown in FIG.
an aperture t opened with a required width in the left and right outer circumferential walls facing the reflective surfaces (inner surfaces) of the left and right curved side walls 11b and 11c of 1;
21a and 21b are respectively disposed over almost the entire length in the axial direction, and a reflective film 22 is coated on the inner peripheral surface of the bottom wall opposite to the inner bottom surface 11a of the reflective plate 11. A phosphor film 23 is coated on the circumferential surface and the inner circumferential surface of the upper wall that closely opposes the illuminated surface 13.

Also in this embodiment, the light emitted from each aperture 20a, 20b is emitted within the fluorescent lamp 20, and the light emitted from each aperture v2
Since the reflected light reflected and diffused by the reflective film 21 is added to the light emitted from 0a and 20b, the light output is increased.

On the other hand, the apertures 20a, 20b and the reflective film 22 reduce the phosphor film deposition area, and each aperture 2
As a reaction to the increased light emitted from 0a and 20b, the light output emitted outward from the outer periphery of the fluorescent lamp 20 decreases, so the light output irradiated from the upper wall of the fluorescent lamp 20 to the illuminated surface 13 decreases. However, the illuminance of the illuminated surface 13 at the irradiated portion decreases.

In contrast, each aperture 20a with increased output,
The light emitted from 20b is radiated laterally to the left and right, reflected and diffused by the left and right curved sides l9iib, ``+1C'' of the reflecting plate 11, and irradiated onto the illuminated surface 13, and the illuminated portion of the illuminated surface 1
Increase the illuminance of step 3.

Therefore, a location close to and facing the fluorescent lamp 2OA,
The illuminance distribution of the illuminated surface 13 at other locations is substantially flat.

Further, in the sixth embodiment, a light diffusing plate 31 having an inverted 1-shaped cross section is covered with an angled reflecting plate 3o so as to close the open upper surface and one side of the reflecting plate 30 by 1°. One straight tube-shaped fluorescent lamp 20B is housed in a space surrounded by the reflecting plate 30 and the light diffusing plate 31.

The fluorescent lamp 20B has an aperture 32 of a required width in the side circumferential wall facing the side wall of the light diffusing plate 31 over almost the entire length in the axial direction.
The reflective film 33 is continuously coated on the bottom wall and the side peripheral wall facing b, and furthermore, the inner peripheral surface of this anti-114 film 33 covers almost the entire circumference and the upper surface close to and opposite to the upper surface of the light diffusing plate 31. A phosphor 1!434 is coated on the inner peripheral surface of the wall.

Therefore, in this embodiment as well, the light emitted from the aperture 1-32 is emitted from the fluorescent lamp 20B and the aperture 32 is emitted.
Since the reflected light reflected and diffused by the reflective film 33 is added to the light emitted from the reflective film 33, the light output is increased.

Moreover, as a reaction to the decrease in the adhesion area of the phosphor film 34 and the increase in the amount of light emitted from the aperture 32, the phosphor WA3
Since the light output radiated outward from the outer circumference of the fluorescent lamp 20 decreases, the light output radiated from the upper wall of the fluorescent lamp 20 to the illuminated surface 13 decreases, and the illuminance of the illuminated surface 13 in that portion decreases.

For this reason, the illuminance on the top surface and side surfaces of the light diffusing plate 31 can be made substantially equal, and the luminance distribution on the top surface and side surfaces of the light diffusing plate 31 can be flattened.

(Effects of the Invention) As explained above, the present invention provides an aperture in which a fluorescent lamp is opened by removing the phosphor film at a portion that does not closely face the surface to be illuminated, and a portion where the aperture opens and the surface to be illuminated is close to the surface to be illuminated. Since the anti-04 film is coated on the inner circumferential surface of the bulb at locations other than the opposing locations, the fluorescent lamp attempts to emit light toward locations other than the aperture opening location and the location close to and opposing the illuminated surface. The light emitted within is reflected and diffused by the reflective film and led out of the fluorescent lamp through the aperture.

Therefore, since the light emitted within the fluorescent lamp is emitted toward the aperture and the reflective film and is output from the aperture, the output of the light emitted from the aperture increases.

Moreover, as a reaction to the reduction in the area to which the phosphor film is adhered and the increase in the amount of light emitted from the aperture, the output of light emitted outward from the outer periphery of the phosphor film is slightly reduced.

Therefore, while the illuminance of the nearby part of the illuminated surface that is close to the fluorescent lamp decreases slightly, the light emitted from the aperture with increased output is irradiated onto the illuminated surface that is not close to the fluorescent lamp, so the illuminance of the illuminated surface decreases slightly. It is possible to flatten the distribution. In other words, it is possible to flatten the luminance distribution on the illuminated surface.

[Brief explanation of the drawing]

1 is a perspective view of an embodiment of a fluorescent lamp device according to the present invention, FIG. 2 is a sectional view taken along the line I-II in FIG. 1, FIG. 3 is a partially enlarged view of FIG. 2, and FIG. The figure is a graph showing the relative brightness distribution of this embodiment in comparison with that of the conventional example, with the horizontal axis corresponding to the width direction dimension of the embodiment shown in FIG. FIG. 10 is a perspective view of the conventional example, and FIG. 11 is a longitudinal sectional view showing the second to sixth embodiments, respectively.
0 is a cross-sectional view taken along line XI-XI arrow 7f4 in FIG. 11.30...Reflector, 11a, 30a...Inner bottom surface, '12.12α, 2OA, 20B...Fluorescent lamp,
12a...Valve, 12b-...Bending part, 12
c, 12d--straight portion, 12e, 12e, 12e
, 12e, i , 23.24... fluorescent film, 13.
...Illuminated surface, 14a, 14b, 14a, 14b
, 14a, 12 2. 3 4b, 14a, 14b, 21a, 2
1b. 32-...Aperture, 15a, 15b, 15a2゜1
5b2, 15a, 15b3.15a, 15b4
, 33... Reflective film. Applicant's Representative Kuki Hatano 1 Figure 2 Figure 5 Figure 6 Figure 17 Figure 0A Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. A fluorescent lamp device in which a fluorescent lamp with a phosphor film coated on the inner peripheral surface of the bulb is housed in a reflector, and the reflector reflects light from the fluorescent lamp onto a surface to be illuminated, The fluorescent lamp has an aperture formed by removing the phosphor film at a location that does not closely face the surface to be illuminated, and also forms an aperture on the inner circumferential surface of the bulb at a location other than the opening of the aperture and the region that closely opposes the surface to be illuminated. A fluorescent lamp device comprising a reflective film coated thereon. 2. The fluorescent lamp consists of a U-shaped fluorescent lamp in which two straight parts are arranged opposite to each other on the inner bottom surface of a reflector, and these straight parts have an adjacent straight part and the above-mentioned reflector. A reflective film is applied to the inner periphery of each opposing surface facing the inner bottom surface of the reflective plate, and the midpoints of the cross sections of these reflective films, which are equally distributed in the circumferential direction, are directed toward the inner bottom surface of the reflector. A fluorescent lamp device according to claim 1, characterized in that: 3. The fluorescent lamp consists of a U-shaped fluorescent lamp in which two straight parts are arranged opposite to each other on the inner bottom surface of the reflector, and these straight parts have two straight parts facing the reflective surface of the side wall of the reflector. Apertures are arranged in the bulb axial direction on the inner circumferential surface of the outer circumferential wall of the bulb, and reflective films are respectively applied in the bulb axial direction on the inner circumferential surface of the bottom wall facing the inner bottom surface of the reflector. A fluorescent lamp device according to claim 1, characterized in that: 4. The fluorescent lamp device according to any one of claims 1 to 3, wherein the reflective film has a phosphor film laminated on its inner peripheral surface. 5. The fluorescent lamp device according to any one of claims 1 to 4, wherein the fluorescent lamp comprises a straight bulb.