JPH0845476A - Fluorescent lamp and color fixing device using it - Google Patents

Abstract

PURPOSE:To provide such a fluorescent lamp and a color fixing device using it that improve light output, reduce light output due to spending of life, namely suppress maintenance rate. CONSTITUTION:A fluorescent lamp is provided with a light transmission airtight container 201 into which discharge gas including mercury is sealed and a phosphor layer 206 which has light emission peak in a wavelength range of 430nm or less and has an aperture part 207 fixed except a specified direction in the inside of the light transmission airtight container, and rating tube wall load is 1000W/m<2> or more. Because it is lit in the case of reaching the tube wall load of 100W/m<2> or more, ultraviolet rays radiation is increased and light converted by a phosphor film is output from the aperture part to the outside so that light quality in this direction increases and light output is increased. And the phosphor layer is not formed on the aperture part so that light absorption can be reduced and maintenance rate can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp for irradiating a fixing paper for color printing with ultraviolet rays or visible light to fix a dye, and a color fixing device using the same.

[0002]

2. Description of the Related Art Recently, a full-color printing apparatus for connecting a dedicated color printer to a TV or VCR and printing an image of a scene displayed on the screen of the TV or VCR onto fixing paper by the dedicated color printer. Is being developed.

This type of color printing apparatus uses a special color thermal paper as a fixing paper, and the color thermal paper is fixed by the fixing device. That is, the color thermal paper 10
As shown in FIG. 21, 0 is applied by stacking dye sources of yellow (yellow) 111, magenta (red) 112, and cyan (blue) 113, which are known as the three primary colors of paint, on the surface of the mount 110, respectively. It is wound around the outer surface of the platen 120 shown in FIG. 19 and rotated.

The printer thermal head 150 first heats a predetermined portion of the yellow layer 111 with low energy to cause the heated portion to develop color. When the color thermal paper 100 rotates with the rotation of the platen 120, the first fluorescent lamp 200 serving as a light source for color fixing has a wavelength of 420 nm.
The above-mentioned light is irradiated, whereby the chemicals in the yellow coloring portion are photoreacted, whereby the yellow dye is fixed.

Next, the printer thermal head 150 heats a predetermined portion of the second magenta layer 112 with medium energy, and this heated portion is colored. Platen 12
When the color thermal paper 100 rotates with the rotation of 0,
Second fluorescent lamp 300 as another color fixing light source
Is irradiated with light having a wavelength of 410 nm or less, for example, ultraviolet light having a wavelength of 365 nm, whereby the drug in the magenta color-developed portion is photoreacted to fix the magenta dye.

Further, the printer thermal head 150 heats a predetermined portion of the third cyan layer 113 to cause the heated portion to develop color. The cyan layer 113 is fixed without being irradiated with light.

By such a fixing method, the pigments of yellow (yellow) 111, magenta (red) 112, and cyan (blue) 113, which are the three primary colors of the paint, are colored, and these colored portions are mixed with each other. The colors are revealed and, as a result, color prints are made.

By the way, the first and second fluorescent lamps 200 and 300 for irradiating visible light and ultraviolet rays are used for fixing the above-mentioned respective dye layers. The agent for fixing the yellow dye source is 420 nm as shown in A of FIG.
A drug having a sensitive wavelength range in the above wavelength range and fixing a magenta dye source is, as shown in B of FIG.
It has a sensitive wavelength range in the wavelength range below 0 nm. For this reason, the first fluorescent lamp 200 has an emission center in the visible light region of 420 nm or more, and the second fluorescent lamp 300 has 410 nm.
A lamp having an emission center in the following wavelength range is used.

Generally, in a fluorescent lamp, ultraviolet rays emitted from mercury enclosed in a bulb can be converted into light in a desired wavelength range by a phosphor layer formed on the inner surface of the bulb. Therefore, the phosphor layer is selected. As a result, it is possible to emit the above visible light of 420 nm or longer, or the light of 410 nm or shorter, and thus it is most suitable as the above-mentioned light source. Moreover, since the fluorescent lamp has a long and narrow light emitting region, it is advantageous for scanning and exposing a thermal paper of a predetermined area, and since the amount of light emitted is large relative to the power consumption, the light emitting efficiency is good and the heat generation is small. Therefore, there is an advantage that the temperature rise of the printing apparatus can be suppressed even when the color printing apparatus is housed in the housing and used. Therefore, the above-mentioned first and second fluorescent lamps 200 and 300 are used as the light source for fixing the color print.

[0010]

However, recently,
There is a demand for improving the performance of this type of color fixing device. That is, the currently used macenda dye source emits a clear color signal when it irradiates an ultraviolet ray of 410 nm or less, for example, around 365 nm from a fluorescent lamp with the same light output as a general fluorescent lamp for general illumination. Not only is it difficult to obtain, but there is also the problem that the fixing time is long. Therefore, in order to improve the performance of the color fixing device, it is necessary to increase the light output of the fluorescent lamp. By doing so, the fixing performance is improved and the fixing speed can be increased.

[0011] Therefore, in order to increase the light output of the fluorescent lamp, the present inventors have tried to increase the tube wall load at the time of rated lighting and to adopt a reflection type fluorescent lamp.
If the tube wall load during rated lighting is set to 1000 W / m ² or more, an increase in light output can be expected, and since the reflection type fluorescent lamp has the structure shown in FIGS. 23 and 24, the aperture section 207 is provided. More emitted light output is increased. That is, FIG. 23 is a front view in which a part of the reflective fluorescent lamp is cut away, and FIG. 24 is a sectional view thereof. This fluorescent lamp has a straight tube type bulb 201 with a stem 2 at both ends.
A transparent airtight container sealed with 02 is formed. A lead wire 204 supporting the electrode 203 is hermetically penetrated through the stem 202. A light reflecting film 205 is formed on the inner surface of the bulb 201, and a phosphor coating 206 is formed on the inner surface of the light reflecting film 205.

The light reflecting film 205 is formed on the inner surface of the bulb 201 except for a predetermined opening angle θ along the circumferential direction of the bulb 201, that is, except for the aperture 207 through which light passes. On the other hand, the phosphor coating 206 is applied over the entire circumference including the aperture 207. Therefore, the phosphor coating 206 is also formed on the inner surface of the aperture portion 207.

With this structure, the load on the pipe wall is 10
Since it is more than 00 W / m ² , the amount of UV radiation during lighting increases. Also, 365 nm converted by the phosphor coating 206
Since the ultraviolet rays in the vicinity are intensively output to the outside from the aperture section 207, the amount of light traveling in this direction increases, and the optical output increases.

However, such a fluorescent lamp is
Although the light output could be significantly improved at the beginning of the life, the light output was significantly decreased with the passage of the life. Such a drastic decrease in light output is a phenomenon that has not been observed not only in fluorescent lamps for general lighting but also in reflection type fluorescent lamps for image reading such as copying machines. It was a phenomenon.

When this point was clarified, the pipe wall load was 10
In the reflection type fluorescent lamp having the structure shown in FIGS. 23 and 24 of 00 W / m ² or more, since the phosphor coating 206 is formed on the inner surface of the aperture portion 207, the phosphor coating 206 self-absorbs. It is presumed that the light will be generated and that the light that is going to be transmitted will be absorbed, resulting in a decrease in the light output.

The present invention has been made in view of the above circumstances. An object of the present invention is to improve the light output and to suppress the decrease in the light output due to the lapse of life, that is, the maintenance rate. Another object of the present invention is to provide a color fixing device using the same.

[0017]

A fluorescent lamp according to the invention of claim 1 has a translucent airtight container in which a discharge gas containing mercury is sealed, and an emission peak in a wavelength range of 430 nm or less. And a phosphor layer having an aperture part that is applied except in a specific direction inside the airtight container, and the rated tube wall load is 1000 W / m ² or more.

The fluorescent lamp of the invention of claim 2 is the fluorescent lamp of claim 1.
The fluorescent lamp of the present invention has a light-reflecting film between the translucent airtight container and the phosphor layer. The fluorescent lamp of the invention of claim 3 is characterized in that the fluorescent lamp of claim 1 or 2 has a translucent protective film on the aperture portion.

The fluorescent lamp of the invention of claim 4 is the fluorescent lamp of claim 1.
The phosphor layer of the fluorescent lamp according to any one of claims 1 to 3 is mainly composed of at least one of Sr ₂ P ₂ O ₇ : Eu and SrB ₄ O ₇ : Eu.

According to the fifth aspect of the present invention, there is provided a color fixing device, wherein the means for moving the fixing paper and the moving fixing paper are
The fluorescent lamp according to any one of claims 1 to 4, which irradiates a fixing light beam, is provided.

According to a sixth aspect of the present invention, there is provided a color fixing device in which the fixing sheet is moved and the moving fixing sheet is
The first fluorescent lamp and the second fluorescent lamp according to any one of claims 1 to 4 for irradiating fixing light beams having different wavelengths from each other.

[0022]

In the fluorescent lamp of the first aspect, since the fluorescent material layer for absorbing light is not formed in the aperture portion, the light output maintenance rate of the fluorescent lamp can be increased. A fluorescent lamp using a phosphor having an emission peak in a wavelength range of 430 nm or less has been put into practical use as a so-called ultraviolet fluorescent lamp, but in the conventional case, the wall load at the time of lighting is 500 W.
Since it is as low as / m ² or less, the rate of lowering the maintenance rate is small, and the problem of the maintenance rate becoming too low did not occur much. Further, a fluorescent lamp which is turned on with a wall load of 500 W / m ² or more has been used as a phosphor having an emission peak in a wavelength range of 430 nm or more, for example, a blue phosphor of a three-wavelength emission fluorescent lamp. Being B
Since aMgO ₂ Al ₁₆ O ₂₇ : Eu (peak wavelength 435 nm) was used, and the tube wall load was 500 W / m ² or more, but less than 1000 W / m ² , the maintenance rate was also too low. It never happened.

On the other hand, the fluorescent lamp of the present invention has a wall load of 1000 W / m ² or more at the time of rated lighting, and the light emitted by the phosphor has an emission peak in the wavelength range of 430 nm or less. The light energy of itself is strong,
It was found that the phosphor itself tends to deteriorate the performance. It has also been found that the performance degradation in this case is due to the phosphor forming a color center and self-absorbing light. Such performance degradation due to self-absorption occurs in the entire phosphor layer, but the effect of reducing the light output is greatly different between the aperture part and the other part, and even if there is performance degradation outside the aperture part, the aperture part It was found that the effect was not so large compared to the performance deterioration in the part.

Therefore, by not forming the phosphor layer that causes light absorption in the aperture portion, the maintenance rate of the fluorescent lamp has been successfully increased. That is, in the fluorescent lamp of claim 1, the rated tube wall load is 1000 W / m ²
Because of the above, the mercury vapor pressure becomes higher, the ultraviolet light output increases, and the light converted by the phosphor layer having an emission peak in the wavelength range of 430 nm or less is emitted to the outside through the aperture part, so the light output in this direction However, since the phosphor layer is not formed in the aperture portion, the light output maintenance rate can be increased.

In the fluorescent lamp of the second aspect, since the light reflecting film is formed on the portion other than the aperture portion, the light output from the aperture portion can be increased. In the fluorescent lamp of the third aspect, since the translucent protective film is formed on the aperture portion, coloring of the glass due to the reaction between the glass and mercury is suppressed in the aperture portion.

In the fluorescent lamp of claim 4, as the phosphor,
Since at least one of Sr ₂ P ₂ O ₇ : Eu and SrB ₄ O ₇ : Eu is used, the output of ultraviolet rays having an emission peak in the wavelength range of 430 nm or less becomes large.

The color fixing device of claim 5 can utilize the effects of the fluorescent lamps of claims 1 to 4 as they are,
Higher fixing performance. According to the color fixing device of the sixth aspect, the effects of the fluorescent lamps of the first to fourth aspects are directly exhibited, and the fixing performance is improved.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the first embodiment shown in FIGS. This embodiment describes an example applied to a color fixing device of a full-color printing device. The basic structure of the color fixing device of the full-color printing device is shown in FIG. 20, which has already been described. Detailed description thereof will be omitted.

That is, 100 is a special color thermal paper as a fixing paper, 120 is a platen, 150 is a printer thermal head, 200 is a first fluorescent lamp as a light source for fixing yellow, and 300 is magenta fixing. It is a second fluorescent lamp which is a light source for use.

FIG. 1 is a side view showing a partial cross section of the first fluorescent lamp 200, FIG. 2 is a cross sectional view thereof, and FIG. 3 is a view showing a distribution characteristic of light emitted from the first fluorescent lamp 200. FIG. 4 is a diagram showing the spectral distribution characteristics of the phosphor itself used in this lamp.

Further, FIG. 5 is a side view showing a partial cross section of the second fluorescent lamp 300, FIG. 6 is a cross sectional view thereof, and FIG. 7 shows a distribution characteristic of light emitted from the second fluorescent lamp 300. FIG. 8 is a reflection characteristic diagram for each wavelength of the light reflecting film, FIG.
FIG. 4 is a reflection characteristic diagram showing the relationship between film thickness and reflectance.

First, regarding the first fluorescent lamp 200,
A description will be given based on FIGS. 1 to 4. In FIGS. 1 and 2, reference numeral 201 is a linear arc tube bulb. This valve 201 has flare stems 202, 2 at both ends.
The flare stem 20 is closed by 02.
The hot cathodes 203, 203 are sealed in 2, 202. Each of the hot cathodes 203, 203 is connected to a lead wire 204 ... Airtightly penetrating the flare stem 202.

As shown in FIG. 2, a light reflecting film 205 is formed on the inner surface of the bulb 201 over a predetermined range in the circumferential direction. This light reflecting film 205 is made of alpha alumina = α
-Al ₂ O ₃ or a metal oxide in which α-alumina and titania TiO ₂ are mixed. Light reflection film 205
Is preferably formed by laminating fine powder of α-alumina. In this case, the thickness of the light reflection film 205 is 20 μm.
Therefore, the thickness is preferably 100 μm or less. Note that α-alumina is formed as a laminated structure by mixing the α-alumina in the form of powder having an average particle size of 0.2 μm or more and 10 μm or less with a solvent, applying this solution to the inner surface of the valve 201 and drying.

The light reflection film 205 has a portion which is not formed over a predetermined range in the circumferential direction.
A region where 5 is not formed is a transparent portion that is transparent, that is, an aperture portion 207. This aperture section 207
Are formed parallel to each other along the tube axis direction of the valve 201 and having a predetermined width. This aperture section 207
Has a divergence angle from the central axis of the valve 201, that is, an opening angle θ of 60 to 90 °.

The phosphor layer 2 is formed on the inner surface of the light reflecting film 205.
06 is laminated. However, the aperture section 20
No phosphor layer 206 is formed on the glass substrate 7, and the glass surface is exposed.

When the phosphor layer 206 is excited by receiving ultraviolet rays of 185 nm and 254 nm mainly emitted from mercury atoms, the emission wavelength of the phosphor layer 206 is 42 as shown in FIG.
It is formed of a phosphor having an emission center at 0 nm or more and 430 nm or less, for example, 425 nm, and a half width of 40 nm or less. As such a phosphor, for example, a halophosphate phosphor represented by the general formula Sr ₂ P ₂ O ₇ : Eu is effective.

A predetermined amount of mercury or amalgam and a rare gas such as argon are enclosed in the valve 201. The first fluorescent lamp 200 having such a configuration
Mercury is ionized and excited by applying a voltage between the electrodes 203 and 203 to discharge, and the mercury is mainly 185 nm.
And emits ultraviolet light of 254 nm. This ultraviolet ray is converted into visible light by the phosphor layer 206. Phosphor layer 206
Is formed of Sr ₂ P ₂ O ₇ : Eu,
Ultraviolet rays of 185 nm and 254 nm are converted into visible light having an emission center at a wavelength of 425 nm and a half width of 40 nm or less. Such visible light is reflected by the light reflection film 205, travels from the aperture portion 207 to the outside of the lamp, and is emitted in one direction of the lamp. During such lighting, the tube wall load is set to 1000 W / m ² or more.

In FIG. 3, the outer diameter of the valve 201 is 17.5 m.
m, bulb length 215 mm, rated input 12.5 W, lamp current 600 mA (fluorescent lamp load is about 1
The spectral distribution characteristics of 059 W / m ² ) are shown. From this spectral distribution characteristic, it is confirmed that this lamp has an emission peak of the light irradiated to the outside from the aperture section 207 at 425 nm and a half-value width of 40 nm or less.

When such a first fluorescent lamp 200 is used as the first light source of the color printing apparatus shown in FIG. 19, fixing of the yellow dye source of the thermal paper 100 is promoted. In this case, since the tube wall load is 1000 W / m ² or more, the emission intensity is high and the irradiation light amount increases.

Light emitted from the lamp (visible light)
Has an emission peak at 425 nm and a full width at half maximum of 40 nm or less, so the ratio of the emission region reaching 410 nm or less is extremely small. Therefore, the sensitive area B below 410 nm
It does not reach the area to fix the magenta dye source with
There is no fear of causing optical noise such as partially reacting the magenta dye source of the second dye layer or degrading this dye layer.

In the fluorescent lamp 200, since the phosphor layer 206 is not formed on the aperture portion 207, the light passing through the aperture portion 207 is not absorbed by the phosphor 206, so that the light transmission efficiency is improved. Well, the light output is improved.

That is, the phosphor of this embodiment uses a halophosphate phosphor represented by Sr ₂ P ₂ O ₇ : Eu having an emission center at 425 nm, and this phosphor is of a special type. Therefore, the deterioration of the phosphor is large, and the self-absorption action of the phosphor is large, and thus absorbs the light that is about to be emitted to the outside through the aperture portion, and provides a light output compared to the conventional phosphor for general lighting. Tends to lower. In the case of such a special phosphor, it is possible to prevent a decrease in the initial light output and the maintenance rate if the phosphor layer is not formed on the aperture section 308.

Further, the light reflection film 2 of the fluorescent lamp 200 described above.
Since No. 05 is formed of a metal oxide containing α-alumina as a main component, it absorbs less light and has excellent reflection characteristics. Therefore, the irradiation amount of the light emitted from the aperture section 207 is increased, so that the fixing performance of the dye layer can be improved and the fixing speed can be increased.

Since the aperture angle 207 of the above embodiment has the opening angle θ in the range of 60 to 90 °, the irradiation of light becomes good. That is, when the opening angle θ is less than 60 °, the irradiation width becomes small, so the scanning width becomes narrow and the fixing performance deteriorates. When the opening angle θ exceeds 90 °, the irradiation range is widened and the intensity of light received by the thermal paper per unit area is reduced.

Next, regarding the second fluorescent lamp 300,
A description will be given based on FIGS. 5 to 9. The basic structure of the second fluorescent lamp 300 may be the same as that of the first fluorescent lamp 200. That is, in FIGS. 5 and 6, reference numeral 301 denotes a straight tube type arc tube bulb made of soft glass. Both ends of this valve 301 are flare stem 3
The flare stems 302 and 302 are sealed with hot cathodes 303 and 303. Each of the hot cathodes 303, 303 is connected to a lead wire 304 ... Airtightly penetrating the flare stem 302.

As shown in FIG. 6, a light reflection film 306 is formed on the inner surface of the bulb 301 over a predetermined range in the circumferential direction. Since the light reflection film 306 is formed over a predetermined range in the circumferential direction, a transparent light transmitting portion, that is, an aperture portion 308 is formed in a region where the light reflection film 306 is not formed.

It should be noted that the aperture portion 308 includes the valve 30.
It is parallel along the axial direction of 1 and is formed with a predetermined width. This aperture portion 308 also has a spread angle from the central axis of the valve 301, that is, an opening angle θ of 60 to 90.
It is set in the range of °.

The light reflection film 306 is formed of alpha alumina = α-Al ₂ O ₃ , or α alumina and titania TiO 2.
It is formed of a mixed metal oxide of ₂ . The light reflection film 306 is preferably formed by laminating fine powder of α-alumina. In this case, the thickness of the light reflection film 306 is
20 μm or more and 100 μm or less is desirable. Note that α-alumina is formed as a laminated structure by mixing the α-alumina with a solvent in the form of powder having an average particle size of 0.2 μm or more and 10 μm or less, coating this solution on the inner surface of the valve 301 and drying.

A transparent protective film 305 is formed on the inner surface of the light reflecting film 306 and the inner surface of the aperture 308. This protective film 305 is for isolating plasma so as not to come into direct contact with the glass wall and for preventing ultraviolet rays of 365 nm from directly entering the soft glass. Has been formed. In this case, by making the thickness of α-alumina extremely thin, a thin film having a transmittance of 90% or more is formed.

If such a light-transmitting protective film 305 is formed, the plasma will not directly contact the glass wall, the mercury ions enclosed in the bulb 301 will not be driven into the glass wall, and the wavelength of 365 nm will be eliminated. Since the ultraviolet rays are prevented from entering the soft glass, the deterioration of the glass is prevented and the blackening of the aperture portion is prevented.

On the inner surface of the translucent protective film 305, a phosphor layer 307 is formed inside the region where the light reflecting film 306 is formed.
Are formed. That is, the phosphor layer 307 is formed in the region excluding the aperture portion 308.

The phosphor layer 307 is formed of a phosphor that receives ultraviolet rays emitted from mercury and converts the ultraviolet rays into light having an emission center at a wavelength of 410 nm or less.
It is formed of a phosphor having an emission center at 5 nm. Examples of such a phosphor include, for example, the general formula SrB ₄ O.
₇ : formed by a borate phosphor represented by Eu.

A predetermined amount of mercury or amalgam and a rare gas such as argon are enclosed in the valve 301. The fixing fluorescent lamp 300 having such a configuration
When a voltage is applied between the electrodes 303 and 303 to discharge, mercury is ionized and excited, and mainly emits ultraviolet rays of 185 nm and 254 nm. This ultraviolet ray is the phosphor layer 3
07, it is converted into light of a predetermined wavelength. Since the fluorescent substance of this lamp is made of SrB4 O7: Eu, it becomes an ultraviolet ray having a strong emission intensity at 365 nm. The ultraviolet ray having a peak wavelength of 365 nm is reflected by the light reflecting film 306, is emitted from the aperture portion 308 to the outside of the lamp, and is emitted in one direction of the lamp. During such lighting, the tube wall load is set to 1000 W / m ² or more.

In FIG. 7, the outer diameter of the valve 301 is 17.5 m.
m, bulb length 215 mm, rated input 12.5 W, lamp current 600 mA fluorescent lamp (tube wall load is about 10
It shows the spectral distribution characteristics of 59 W / m ² ). From this spectral distribution characteristic, it is confirmed that the emission peak of the light emitted from the aperture section 308 to the outside is around 365 nm.

Therefore, this second fluorescent lamp 300
Is used as the second light source of the color printing apparatus shown in FIG. 20, the fixing of the magenta dye source of the thermal paper 100 is promoted. In this case, since the tube wall load is 1000 W / m ² or more, the emission intensity of 365 nm is high as shown in FIG. 7, and a light intensity sufficient for clearly fixing the magenta dye source is output, and irradiation is performed. The amount of light increases.

Since the light reflection film 306 of the fluorescent lamp 300 is formed of a metal oxide containing α-alumina as a main component, it has excellent ultraviolet ray reflection characteristics.
That is, in the conventional case, the light reflection film 306 is made of Al ₂ O ₃
Since it was formed of a mixture of TiO ₂ and TiO ₂ (50 wt% each), it tends to absorb ultraviolet rays of 365 nm, and as shown by a broken line a in FIG. On the other hand, when the light reflecting film 6 is formed of only α-alumina as in the above embodiment, the absorption of ultraviolet rays is small, and therefore, as shown by the solid lines b to g in FIG.
The reflection characteristics in the wavelength range around 365 nm are improved.

Solid lines b to g in FIG. 8 show the respective reflection characteristics when the film thickness t of the light reflecting film 306 is changed. The solid line b shows the film thickness t of 50 μm, and the solid line c shows the film. When the thickness t is 27 μm, the solid line d is the film thickness t of 20 μm, the solid line e is the film thickness t of 11 μm, and the solid line f is the film thickness t.
Is 9 μm, and the solid line g shows the case where the film thickness t is 7 μm.

From this characteristic diagram, it can be seen that when the light reflection film 306 is formed of α-alumina, the reflection characteristics are improved as compared with the light reflection film made of a mixture of Al ₂ O ₃ and TiO ₂ . Therefore, the intensity of the ultraviolet rays emitted from the aperture section 308 is increased, the fixing performance of the magenta dye layer is improved, and the fixing speed is also improved.

FIG. 9 is a characteristic diagram showing changes in the reflection characteristic when the film thickness t of the light reflecting film 306 is changed, based on the characteristic diagram of FIG. The light reflection film 306 made of α-alumina can have a high total reflectance of 80% or more if the film thickness t is 20 μm or more. Therefore, the film thickness t of the light reflection film 306 is 20 μm or more. Is desirable.

However, if the film thickness t of the light reflecting film 306 is made too thick, there is a problem that the film strength is lowered and the film easily peels off. According to the experiments by the present inventors, the light reflecting film 30
It has been confirmed that when the film thickness t of 6 exceeds 100 μm, the strength is significantly reduced, and the maximum film thickness t is 100 μm. From this, the thickness t of the light reflection film 306 is 2
It is desirable that the thickness is 0 μm or more and 100 μm or less.

The second aperture type fluorescent lamp 300 described above.
Is SrB ₄ which has a peak emission at 365 nm as a phosphor.
O ₇ : Eu is used, and this phosphor also has a strong self-absorption effect, and when applied to the aperture part 308, there is a concern that it absorbs the 365 nm ultraviolet light that is about to be emitted to the outside and reduces the irradiation intensity of the ultraviolet light. Therefore, in the fluorescent lamp 300 of this example, it is necessary not to form the phosphor layer on the aperture portion 308. That is, this phosphor is also 430 nm
It is a special phosphor because it has the following peak emission, and it has a large deterioration of the phosphor and a large self-absorption effect of the phosphor, and thus absorbs the light that is going to be emitted to the outside through the aperture part. Then, the light output tends to be lower than that of the conventional phosphor for general illumination. In the case of such a special phosphor, it is possible to prevent the reduction of the initial light output and the maintenance rate by not forming it in the aperture portion 308.

The results of experiments conducted on this point will be described with reference to FIGS. FIGS. 10A to 10E show cross-sectional structures of various fluorescent lamps in which the coating film formed on the inner surface is different, and FIGS.
Have the following structures. (A) The phosphor layer is applied over the entire inner surface of the bulb. (B) A phosphor layer is applied to the inner surface of the bulb except for the aperture portion. (C) A light reflection film is formed on the inner surface of the bulb except the aperture portion, and a phosphor layer is laminated and coated on the light reflection film except the aperture portion. (D) A light reflection film is formed on the inner surface of the bulb except the aperture portion, and a phosphor layer is applied on the aperture portion and the light reflection film. (Prior art example of FIG. 24) (E) A protective film is formed on the entire inner surface of the bulb including the aperture portion, a light reflecting film is formed excluding the aperture portion, and a light reflecting film is formed excluding the aperture portion. Is coated with a phosphor layer. (Example of FIG. 6) FIGS. 11 and 12 show (A) to FIG.
It is a characteristic view which measured the relationship between lighting time and relative light output about each fluorescent lamp of the structure shown in (E). FIG.
The characteristic diagram of No. 1 is used as a phosphor layer, and is used as a blue phosphor of a three-wavelength emission type fluorescent lamp for general illumination.
aMgO ₂ Al ₁₆ O ₂₇ : Eu phosphor (peak wavelength 435
(nm) is an example of a fluorescent lamp using (A)
(E) corresponds to the configuration of (A) to (E) of FIG. The characteristic diagram of FIG. 12 is an example of a fluorescent lamp using SrB ₄ O ₇ : Eu having a peak emission at 365 nm as a phosphor layer, and (A) to (E) of the graph are shown in FIG. )-(E). In addition, these characteristics show that the light output of the lamp having the configuration (A) is 10
It is a relative value with 0%.

In the case of the comparative example shown in FIG. 11, that is, in a lamp using a phosphor used as a blue phosphor of a three-wavelength emission type fluorescent lamp for general illumination, as in the type (D), The initial light output is higher when the phosphor layer is formed in the area, and the reduction of the maintenance factor is not observed. On the other hand, in the case of the fluorescent lamp using SrB ₄ O ₇ : Eu shown in FIG. 12, the type (D) in which the phosphor layer is formed in the aperture part is the type (C) in which the phosphor layer is not formed in the aperture part. Compared with the (E) type, the initial light output and the maintenance factor are remarkably lowered unlike the conventional phosphors for general illumination.

This is because the type of the phosphor is special, that is, the phosphor having an emission peak at 430 nm or less, so that the deterioration of the phosphor is large, and as a result, the self-absorption action becomes large and the external light is absorbed through the aperture portion. This is because it absorbs the light that is about to be emitted to the inside and reduces the light output as compared with the conventional phosphor for general illumination. Therefore, when using such a special phosphor, the aperture section 30
If the phosphor layer is not formed in No. 8, it is possible to prevent the reduction of the initial light output and the maintenance rate, which is an unexpected effect.

The result of confirming this by another experiment is shown in FIG. FIG. 13 shows SrB ₄ O ₇ : Eu fluorescent material according to the present invention and BaMgO ₂ Al ₁₆ O ₂₇ : Eu fluorescent material used as a blue fluorescent material of a three-wavelength emission type fluorescent lamp for general illumination as a comparative example. 30 with the body
The transmittance of 0-400nm is measured before and after UV irradiation, and UV
FIG. 6 is a characteristic diagram in which the degree of reduction in transmittance due to irradiation is expressed by a maintenance rate. It shows how much the transmittance after deterioration is maintained when the maintenance ratio before deterioration is 100%.

As is clear from these results, the ultraviolet-emitting type phosphor made of SrB ₄ O ₇ : Eu has a very poor maintenance rate as compared with the phosphor for general illumination, and therefore the phosphor is applied to the aperture portion. It was confirmed that not doing is effective.

Since the aperture portion 308 of the embodiment has the opening angle θ in the range of 60 to 90 °, the irradiation amount of ultraviolet rays becomes good. That is, when the opening angle θ is less than 60 °, the irradiation width becomes small, so the scanning width becomes narrow and the fixing performance deteriorates. When the opening angle θ exceeds 90 °,
The irradiation range is widened and the intensity of ultraviolet rays received by the thermal paper per unit area is weakened.

When the first fluorescent lamp 200 and the second fluorescent lamp 300 having the above characteristics are applied to the fixing device of the full-color printing device shown in FIG. 20, the following effects are obtained.

That is, the first fluorescent lamp 200 has four
Since it has a light emitting region in the wavelength range of 20 nm or more and its spread is narrow, when the lamp 200 is turned on and the yellow dye source is fixed, it can be used as a macender dye source having a sensitive region in the wavelength range of 420 nm or less. On the other hand, it does not cause optical noise, so that problems such as fixing of the dye source of the macender and deterioration of the dye source of the macender are eliminated. Moreover, the first
Since the fluorescent lamp 200 of No. 2 is turned on at a tube wall load of 1000 W / m ² or more, the emission intensity in the wavelength range of 420 nm or more becomes high and the fixing performance of the yellow dye source becomes high.

On the other hand, the second fluorescent lamp 300 has 410
Since it has an emission region in a wavelength range of less than or equal to 365 nm, for example, 365 nm, it is far from the sensitive region of the yellow dye source, and when this lamp 300 is turned on to fix the magenta dye source,
It does not emit optical noise to the yellow dye source, which causes fixing and deterioration of the yellow dye source. And the second
The fluorescent lamp 300 of No. ² is also turned on at a tube wall load of 1000 W / m ² or more, so that the emission intensity in the wavelength region of 410 nm or more becomes high and the fixing performance of the magenta dye source becomes high.

From the above, the first fluorescent lamp 2
00 and the second fluorescent lamp 300 have their respective light intensities improved, and the mutual influence of optical noise is reduced. Therefore, the fixing performance of the fixing device of the color printing device is improved, and the fixing speed is increased. be able to.

Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment shows an example in which the first fluorescent lamp 400 and the second fluorescent lamp 500 are each formed in a U shape. FIG. 14 shows a fixing device of a color printing apparatus, 100 is a color thermal paper, and 120 is a color thermal paper. Is a platen, 150 is a printer thermal head, 400 is a first U-shaped fluorescent lamp which is a light source for fixing yellow, and 500 is a second U-shaped fluorescent lamp which is a light source for fixing magenta.

First, the first U-shaped fluorescent lamp 400 will be described with reference to FIGS. 15 and 16. 410
Is a U-shaped arc tube bulb. This valve 410
The ends of the two straight pipe portions 411 and 411 are U-shaped bent portions 41.
It communicates through 2. The lengths of the straight pipe portions 411, 411 are formed larger than the width of the platen 120 shown in FIG. 14, and one ends of the straight pipe portions 411, 411 are closed by the stems 413, 413. Electrodes 414 and 414 are sealed on the stems 413 and 413, respectively. A thin tube 419 projects from the bent portion 412, and this thin tube 419 becomes the coldest portion during the lighting of the lamp. The thin tube 419 contains mercury or amalgam.

As shown in FIG. 16, a light reflection film 415 is formed on the inner surface of the bulb 410 in the circumferential direction over a predetermined range in the same manner as in the first embodiment, and the light reflection film 415 is formed. The aperture portion 417 is formed in the area not formed.
Are formed. The aperture angle 417 of the aperture section 417 is set in the range of θ = 60 to 90 ° as in the first embodiment.

The phosphor layer 4 is formed on the inner surface of the light reflection film 415.
16 are formed. However, the phosphor layer 416 is not formed on the aperture section 417. Phosphor layer 416
Has a luminescence center 425 nm, is formed, a phosphor half width is 40nm or less, for example, the general formula Sr ₂
A halophosphate phosphor represented by P ₂ O ₇ : Eu is used.

Aperture part 4 of each straight pipe part 411, 411
17, 417 are inclined in a direction in which they face each other at a predetermined inclination angle β. The inclination angle β is 45 to 90 °, and preferably 60 °. A point P where the inclined lines of the aperture portions 417 and 417 intersect is a position that coincides with the fixing surface of the platen 120 in FIG.
When the inclination angle β is 60 °, the intersection point P with the central axis of the valve
The triangle formed by is set to form an equilateral triangle.

The light reflection film 415 is also formed of a metal oxide containing α-alumina as a main component, and the film thickness is
It is set to 20 μm or more and 100 μm or less. Note that α
As the alumina, powder having an average particle size of 0.2 μm or more and 10 μm or less is used.

The above-mentioned bulb 1 is filled with the above-mentioned mercury or amalgam and a rare gas such as argon. The first U-shaped aperture fluorescent lamp 400 configured as described above has two straight tube portions 411, 41.
The visible light is emitted from the aperture parts 417 and 417, respectively, so that the fluorescent lamp 2 shown in the first embodiment is
As in the case of using two 00, the irradiation light amount increases. Therefore, the fixing ability is almost doubled.

Moreover, since the aperture portions 417 and 417 formed on the straight pipe portions 411 and 411 face each other with a predetermined inclination angle β, they face each other.
The ultraviolet rays radiated from Nos. 17 and 417 overlap each other on the fixing surface of the platen 120, and the irradiation intensity becomes extremely high as shown by the characteristic C in FIG. Therefore, the irradiation amount of visible light is increased, the fixing performance of the thermal paper 100 is improved, and the fixing speed can be increased.

Further, since the inclination angles β of the aperture portions 417 and 417 of the straight pipe portions 411 and 411 are set to 45 to 90 °, the overlapping condition of the irradiation light is improved, and particularly when the inclination angle β is set to 60 °. High irradiation intensity can be obtained.

Further, in the case of the first U-shaped fluorescent lamp 400 having such a structure, as shown in FIG. 15, the length of the two straight pipe portions 411, 411 is set to the width W of the platen 120.
It is possible to make it larger and form the thin tube 419 in the bent portion 412 that communicates these straight tube portions 411, 411.
Therefore, the thin tube 419 can be attached to a position outside the effective light emitting region for irradiating the platen 120,
It is possible to effectively use the light emitting region. In addition, the thermal paper 100
The platen 120 and the platen 120 are heated by the heat transmitted from the thermal head 150.
Since it is installed at a position outside the width W of 0 and outside the feed path of the thermal paper 100, heat is not transmitted from the thermal paper 100 or the platen 120. Therefore, thin tube 4
It is possible to surely generate the coldest part in 19, to reliably control the mercury vapor pressure, and to prevent variations in ultraviolet intensity.

Further, since the phosphor layer 416 is not formed in the aperture section 417, the light passing through the aperture section 417 is not absorbed by the phosphor 416, so that the light transmission efficiency is good and the light output is good. Is improved.

That is, the phosphor of this embodiment uses a halophosphate phosphor represented by Sr ₂ P ₂ O ₇ : Eu having an emission center at 425 nm. This phosphor is of a special type. Therefore, the deterioration of the phosphor is large, and the self-absorption action of the phosphor is large, and thus absorbs the light that is about to be emitted to the outside through the aperture portion, and provides a light output compared to the conventional phosphor for general lighting. Tends to lower. In the case of such a special phosphor, it is possible to prevent a decrease in the initial light output and the maintenance rate if the phosphor layer is not formed in the aperture section 308.

Next, the second U-shaped fluorescent lamp 500 will be described with reference to FIGS. 17 and 18. In the figure, 510 is a U-shaped arc tube bulb. In this valve 510, the ends of the two straight pipe portions 511 and 511 communicate with each other through a U-shaped bent portion 512. Straight pipe section 511, 51
1 is also formed to be larger than the width W of the platen 120 shown in FIG. 14, one ends of these straight pipe portions 511 and 511 are closed by stems 513 and 513, and electrodes 514 are attached to these stems 513 and 513, respectively. , 514 are sealed. A thin tube 519 protrudes from the bent portion 512, and this thin tube 519 becomes the coldest portion during the lighting of the lamp. The thin tube 519 contains mercury or amalgam.

As shown in FIG. 18, on the inner surface of the bulb 510, a light reflection film 516 is formed over a predetermined range in the circumferential direction, as in the first embodiment, and this light reflection film 516 is formed. The non-existing region is the aperture portion 518. The aperture angle 518 of the aperture section 518 is set in the range of 60 to 90 °. A light-transmitting protective film 515 containing α-alumina as a main component is formed on the inner surface of the light reflecting film 516 and the aperture portion 518. On the inner surface of the translucent protective film 515 facing the light reflection film 516 on the discharge space side,
The phosphor layer 517 is formed over a predetermined range in the circumferential direction. The phosphor layer 517 is not formed on the aperture portion 518.

Aperture part 5 of each straight pipe part 511, 511
18, 518 are inclined in a direction in which they face each other at a predetermined inclination angle β. The inclination angle β is 45 to 90 °, and preferably 60 °. The point P where the inclined lines of the aperture portions 518 and 518 intersect is located on the fixing surface of the platen 120 in FIG. 14, and when the inclination angle β is 6 °, the intersection point with the central axis of the valve is set. The triangle formed by P is set to be an equilateral triangle.

The light reflecting film 516 is also formed of a metal oxide containing α-alumina as a main component, and the film thickness is
It is set to 20 μm or more and 100 μm or less. The phosphor layer 517 is SrB ₄ O ₇ : E having an emission center at 365 nm.
It is formed by a u phosphor. Such a valve 5
The above-described mercury or amalgam and a rare gas such as argon are enclosed in the inside 10.

Also in the case of the second U-shaped fluorescent lamp 500 configured as described above, the ultraviolet rays are emitted from the aperture portions 518 and 518 of the two straight pipe portions 511 and 511, respectively, so that the first embodiment is performed. As in the case of using two fluorescent lamps shown in the example, the irradiation amount of ultraviolet rays of 365 nm is increased.
Therefore, the fixing ability of magenta is doubled.

Moreover, since the aperture portions 518, 518 formed on the straight pipe portions 511, 511 face each other with a predetermined inclination angle β, the aperture portions 5
The ultraviolet rays emitted from Nos. 18 and 518 overlap each other on the fixing surface of the platen 120, and the irradiation intensity becomes extremely high as shown by the characteristic C in FIG. Therefore, the irradiation amount of ultraviolet rays is increased, the magenta fixing performance of the thermal paper 100 is improved, and the fixing speed can be increased.

Also in this case, since the light reflection film 516 is formed of α-alumina, absorption of the wavelength of 365 nm is small, and therefore the reflection characteristics are improved and the intensity of ultraviolet rays irradiated to the outside can be increased. it can.

Further, the film thickness t of the light reflection film 516 is set to 2
Since it is regulated to 0 μm or more and 100 μm or less, high reflection characteristics can be maintained, and the aperture portion 518,
Since the opening angle θ of 518 is set in the range of 60 to 90 °, the irradiation amount of ultraviolet rays becomes good.

Further, since the inclination angles β of the aperture portions 518 and 518 of the straight pipe portions 511 and 511 are set to 45 to 90 °, the degree of overlap of ultraviolet rays is improved, and the inclination angle β is particularly good.
A high irradiation intensity can be obtained by setting the angle to 60 °.

Also, this U-shaped fluorescent lamp 500
Also in the case of, as shown in FIG. 17, the two straight pipe parts 511,
The length of 511 can be made larger than the width W of the platen 120 to form the thin tube 519 in the bent portion 512, and the thin tube 519 can be attached to a position outside the effective light emitting region for irradiating the platen 120. Therefore, the light emitting region can be effectively used. Further, the thermal paper 100 and the platen 120 are heated by the heat transmitted from the thermal head 150, but the thin tube 519 of the lamp is located at a position outside the width W of the platen 120 and out of the feeding path of the thermal paper 100. Since it is installed, thermal paper 100 and platen 120
The heat is not transmitted from. Therefore, it is possible to reliably generate the coldest portion in the thin tube 519, reliably control the mercury vapor pressure, and prevent variations in the ultraviolet intensity.

Also in this case, since the phosphor layer 517 is not formed in the aperture section 518, the light passing through the aperture section 518 is not absorbed by the phosphor 517, so that the light transmission efficiency is improved. Well, the light output is improved.

That is, the phosphor 517 of this embodiment is 3
The SrB ₄ O ₇ : Eu phosphor having an emission center at 65 nm is used. Since this phosphor is also a special type, the phosphor is greatly deteriorated and the self-absorption action of the phosphor is large. There is a tendency to absorb the light that is about to be emitted to the outside through, and to lower the light output as compared with the conventional phosphor for general illumination. In the case of such a special phosphor, it is better not to form a phosphor layer on the aperture section 518.
It is possible to prevent a decrease in initial light output and maintenance rate.

The present invention is not limited to the above embodiment. That is, in the second embodiment, the case where U-shaped fluorescent lamps are used as the first fluorescent lamp 400 and the second fluorescent lamp 500 has been described, but the present invention is the third fluorescent lamp shown in FIG. As in the embodiment, one or both of these fluorescent lamps are
The fluorescent lamp 600 may be a letter-shaped fluorescent lamp. In the H-shaped fluorescent lamp 600, the two straight pipe portions 621 and 621 are melted by heating and melting the side walls of the two straight pipe portions 621 and 621 at their end portions. Are mechanically joined and the internal spaces are electrically connected to each other. Therefore, the straight tube portions 621 and 621 and the fusion-bonded portion 622 form an arc tube bulb having a shape resembling an H shape as a whole. With such a structure,
If the thin tube 619 is provided so as to project from the end of either one of the straight tube portions 621, the same operational effect as in the case of using the U-shaped fluorescent lamp shown in the second embodiment is obtained.

In addition, the second fluorescent lamps 300, 500
Is 365 nm on the inner surfaces of the bulbs 301 and 510, respectively.
Having an emission intensity of, for example, SrB4 O7: Eu phosphor layer 3
Although the structure of the fluorescent lamp formed by forming 07, 517 is adopted, the second fluorescent lamp is not limited to the fluorescent lamp, and the fluorescent material is not limited to the fluorescent lamp because it is sufficient to emit the ultraviolet light having the peak wavelength in the ultraviolet region of 410 nm or less. It may be composed of a mercury lamp for emitting ultraviolet light having no layer or a rare gas discharge lamp.

[0098]

As described above, according to the fluorescent lamp of the first aspect, since the lamp is lit at a tube wall load of 1000 W / m ² or more, the mercury vapor pressure increases and the ultraviolet radiation amount increases.
Further, since the light converted by the phosphor coating is intensively output from the aperture portion, the amount of light traveling in this direction increases,
The light output will increase. Moreover, since the phosphor layer is not formed in the aperture portion, light absorption in the aperture portion is reduced, and the light output of the fluorescent lamp is improved and the maintenance rate can be increased.

According to the fluorescent lamp of the second aspect, since the light reflecting film is formed on the portion other than the aperture portion, the light output from the aperture portion can be increased. According to the fluorescent lamp of the third aspect, since the translucent protective film is formed on the aperture portion, coloring of the glass due to the reaction between the glass and mercury is suppressed in the aperture portion.

According to the fluorescent lamp of claim 4, Sr ₂ P ₂ O ₇ : Eu or SrB ₄ O ₇ : Eu is used as the phosphor.
Since at least one of the above is used, the output of ultraviolet rays having an emission peak in the wavelength range of 430 nm or less is improved.

The color fixing device of claim 5 can utilize the effects of the fluorescent lamps of claims 1 to 4 as they are,
Higher fixing performance. According to the color fixing device of the sixth aspect, the effects of the fluorescent lamps of the first to fourth aspects are directly exhibited, and the fixing performance is improved.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention, in which a part of a first fluorescent lamp is sectioned.

FIG. 2 is a cross-sectional view of the first fluorescent lamp of the same embodiment.

FIG. 3 is a diagram showing a spectral distribution characteristic of the first fluorescent lamp of the same embodiment.

FIG. 4 is a diagram showing spectral distribution characteristics of a phosphor used in the first fluorescent lamp of the same embodiment.

FIG. 5 is a partially sectional front view of a second fluorescent lamp of the same embodiment.

FIG. 6 is a cross-sectional view of a second fluorescent lamp of the same embodiment.

FIG. 7 is a diagram showing a spectral distribution characteristic in the second fluorescent lamp of the same embodiment.

FIG. 8 is a diagram showing the reflectance at each wavelength when variously changing the light reflecting film of the embodiment.

FIG. 9 is a diagram showing the relationship between the film thickness and the reflectance of the light reflecting film of the example.

10 (A) to (E) are cross-sectional views showing a coating structure formed on the inner surface of the valve.

FIG. 11: B used in a three-wavelength fluorescent lamp
FIG. 11 is a characteristic diagram showing the relationship between lighting time and relative light output when the fluorescent lamps of FIGS. 10A to 10E are manufactured using the aMgO ₂ Al ₁₆ O ₂₇ : Eu phosphor.

FIG. 12 is a characteristic diagram showing the relationship between lighting time and relative light output when the fluorescent lamps of FIGS. 10A to 10E are manufactured using the SrB ₄ O ₇ : Eu phosphor.

FIG. 13 is a characteristic diagram showing transmittance retention rates in the case of BaMgO ₂ Al ₁₆ O ₂₇ : Eu phosphor and in the case of SrB ₄ O ₇ : Eu phosphor.

FIG. 14 is a schematic configuration diagram of a color printing apparatus according to the second embodiment of the present invention.

FIG. 15 is a front view in which a part of a first fluorescent lamp used in the second embodiment is sectioned.

FIG. 16 is a cross-sectional view of the first fluorescent lamp of the same embodiment.

FIG. 17 is a partially sectional front view of the second fluorescent lamp of the same embodiment.

FIG. 18 is a sectional view of a second fluorescent lamp of the same embodiment.

FIG. 19 is a plan view of an H-shaped fluorescent lamp showing a third embodiment of the present invention.

FIG. 20 is a schematic configuration diagram illustrating the principle of a color printing apparatus.

FIG. 21 is a diagram illustrating the structure of a thermal paper for color printing.

FIG. 22 is a diagram showing light-sensitive regions of yellow dye and magenta dye.

FIG. 23 is a front view showing a cross section of a part of a conventional fluorescent lamp.

FIG. 24 is a transverse sectional view of the fluorescent lamp.

[Explanation of symbols]

100 ... Color thermal paper 120 ... Platen 150 ... Thermal head 200, 400 ... First fluorescent lamp 300, 500 ... Second fluorescent lamp 201, 301, 410, 510 ... Arc tube bulb 203, 303, 414, 514 ... Electrode 205, 306, 415, 516 ... Light reflection film 206, 307, 416, 517 ... Phosphor layer 305, 515 ... Protective film 207, 308, 417, 518 ... Aperture part 411, 511, 621 ... Straight part 419, 519, 619 ... thin tube

Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H01J 61/35 Z (72) Inventor Akira Taya 4-3-1, Higashishinagawa, Shinagawa-ku, Tokyo TOSHIBA LIGHTEC CORPORATION Within

Claims (6)

[Claims] 1. A translucent airtight container in which a discharge gas containing mercury is sealed, and an emission peak in a wavelength range of 430 nm or less, which is deposited except a specific direction inside the translucent airtight container. And a phosphor layer having an aperture portion, and the rated tube wall load is 1000 W / m ² or more. 2. The fluorescent lamp according to claim 1, further comprising a light reflecting film between the translucent airtight container and the phosphor layer. 3. The fluorescent lamp according to claim 1, wherein the aperture portion has a translucent protective film. 4. The phosphor layer is mainly composed of at least one of Sr ₂ P ₂ O ₇ : Eu and SrB ₄ O ₇ : Eu. Or the fluorescent lamp described in 1. 5. A means for moving a fixing paper, and the fluorescent lamp according to claim 1, wherein the moving fixing paper is irradiated with a fixing light beam. Characteristic color fixing device. 6. The first fluorescent lamp according to claim 1, wherein the fixing sheet is moved, and the moved fixing sheet is irradiated with fixing rays having different wavelengths. And a second fluorescent lamp, and a color fixing device.