HK1027900B - A portable lighting device - Google Patents

Description

Movable lamp

Technical Field

The present invention relates to a light bulb for use as lighting, for example, in a mobile light fixture, and to a mobile light fixture.

Background

In the past, such a bulb was able to emit light only when supplied with electric power, and a lamp using the bulb was provided in a reflector and illuminated by the light emitted from the bulb being connected to a power source.

However, such a conventional bulb and a lamp using the bulb have a problem that the lighted bulb is immediately turned off when the power supply is stopped, and the surrounding situation and the position of the lamp cannot be distinguished. In this regard, for example, when the bicycle is used as a bicycle headlamp, there is a problem in safety, such as when the bicycle stops riding, a person coming from the opposite side cannot recognize the existence of the bicycle and collides with the bicycle, or when the driver fails to recognize the existence of the bicycle at a place such as an intersection, an accident occurs, or it is difficult to find a lamp in case of an unexpected power failure. In addition, the light bulb is carried by a human hand or fixed to a lamp socket. Therefore, measures are required to make the phosphorescent phosphor layer less likely to peel off.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object thereof is to provide a bulb and a portable lamp in which a light-storing phosphor layer is not easily peeled off, which has a long-lasting light-storing fluorescence, and which can emit light for a certain period of time even after the bulb is turned off.

In order to achieve the above object, according to the present invention, there is provided a portable lamp having a lamp including a bulb, a phosphorescent phosphor layer provided on at least a front surface side of the bulb, the phosphorescent phosphor layer containing a phosphorescent phosphor compound and a binder resin, the phosphorescent phosphor layer covering a quarter to a half of a surface area of the bulb, the lamp being provided inside a reflector.

The present invention provides a light bulb characterized in that a phosphorescent phosphor layer containing a phosphorescent phosphor compound and a binder resin is provided at least on the front surface side of a bulb envelope. The strength and durability of the light-storing phosphor layer can be improved by containing the binder resin. The binder resin is preferably used in an amount of 1 to 50 parts by weight based on 100 parts by weight of the phosphorescent phosphor compound. When the weight of the binder resin is less than 1, the strength and durability of the phosphorescent phosphor layer tend to be lowered; when the weight of the binder resin exceeds 50, the phosphorescent fluorescence tends to decrease.

Further, in the lamp bulb, the thickness of the layer of the light-storing phosphor layer is preferably 150mg/cm²Above, 250mg/cm²Within the following ranges.This is to prevent the illuminance from being excessively lowered when the lamp is normally lighted, and to allow the light emitted from the phosphorescent phosphor layer to be recognized even after the lamp is extinguished.

In the above bulb, the portion where the phosphorescent phosphor layer is present is preferably in the range of one fourth to one half of the surface area of the bulb. If the phosphorescent phosphor layer is present on at least the front side of the bulb and in a range of one-fourth to one-half of the surface area of the bulb, the light emitted from the phosphorescent phosphor layer can be recognized by a person even after the bulb is turned off.

The bulb may be an inorganic substance having an emission peak at a wavelength of about 350 to 700nm as a phosphorescent phosphor. This is because the wavelength range of about 350 to 700nm is a visible light range and can be recognized by a human.

In addition, the lamp bulb may be provided with strontium aluminate (SrAl) as the light-storing phosphor layer₂O₄) As the main component. Thus, it is low cost and easy to use.

Next, the movable lamp of the present invention is characterized in that the bulb is provided on the inner side (front side) of the reflector. The phosphorescent phosphor coated portion of the front portion of the bulb is located forward in use, and the reflector as a lamp member is located rearward.

Examples of the portable lamp include a flashlight, a bicycle headlamp, and a headlamp.

The bulb of the present invention is used in, for example, a portable lamp and a portable lamp, and is constituted by a bulb having a light-storing phosphor layer on the front surface side of a bulb case. With this structure, when the lamp is turned on, the light energy is accumulated in the phosphorescent phosphor layer provided on the front surface, and when the lamp is turned off, the light energy accumulated in the phosphorescent phosphor layer is released. Therefore, even if the power supply stops supplying power, the bulb can still continuously emit light for a certain time.

The lamp has a structure in which a bulb having the above-described light-storing phosphor layer is provided on the inner side (front side) of the reflector. With this structure, the reduction of the illuminance of the phosphorescent phosphor layer irradiated forward can be reduced when the lamp is turned on, and the effect of emitting light from both the outer surface and the inner surface of the phosphorescent phosphor layer can be enhanced by the reflector when the lamp is turned off.

The main component (matrix) of the phosphorescent phosphor used in the present invention may be generally known zinc sulfide (ZnS), but strontium aluminate (SrAl) is preferably used₂O₄). This is because, as shown in the following (table 1), strontium aluminate (SrAl)₂O₄) Compared with zinc sulfide (ZnS), the afterglow time is about 10 times the latter, and the afterglow luminance is about 5 times, which are superior to the latter.

TABLE 1

Name (R)	Strontium aluminate (SrAl)2O4)	Zinc sulfide (ZnS)
			Excitation wavelength	200～450	200～450
Luminescence peak wavelength (nm)	520	530
			Afterglow time (minutes)	Above 2000	About 200
Afterglow luminance2)(cd/m2)	About 2.0	About 0.4

(remarks)

*1: the afterglow time is determined by using a common light source D₆₅After 5 minutes of irradiation with 1000 lux of illumination, the afterglow luminance decays to 0.3mcd/m²The time of (2) is obtained.

*2: afterglow luminance using a conventional light source D₆₅The luminance was measured after 1 minute after 5 minutes of irradiation with 1000 lux of illumination.

For strontium aluminate (SrAl)₂O₄) The activating agent may be europium, cerium, praseodymium, neodymium, samarium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium in an amount of 0.02 to 20 mol% based on the amount of strontium.

In the present invention, as another phosphor, for example, (SrCaBaMg)₅(PO₄)₃Cl:Eu、BaMg₂Al₁₆O₂₇:Eu、LaPO₄:Ce，Tb、MgAl₁₁O₁₉:Ce，Tb、Y₂O₂:Eu、CaAl₂O₄:Eu，Tm、BaAl₂O₄Eu, Tm, etc.

The phosphorescent phosphor layer is preferably formed of a phosphorescent phosphor compound and a binder resin. Examples of the binder resin include (meth) acrylic resins, polyurethane resins, polyolefin resins such AS polyethylene and polypropylene, EVA resins, ABS resins, AS resins, polystyrene resins, polycarbonate resins, polyacetal resins, polyester resins, polyamide resins, epoxy resins, phenol resins, urea resins, melamine resins, diallyl phthalate resins, silicone resins, polyimide resins, particularly polyimide resins soluble in polar solvents (polyimide resins containing ether bonds or sulfonic bonds), vinyl resins, polysulfone resins, polyether-alum resins, cellulose resins, and derivatives thereof. In particular, a transparent resin which does not block light is preferably used.

In order to form the phosphorescent phosphor layer, for example, the binder resin is dissolved in a solvent capable of dissolving the binder resin, and the phosphorescent phosphor compound is added to the solution and mixed to prepare a coating material, and the coating material is applied to a predetermined portion of the lamp bulb. When the coating material is applied to the front surface of the bulb in a range of one-fourth to one-half of the surface area of the bulb shell, the end portion on the front surface of the bulb is immersed in the coating material, taken out, and dried to remove the solvent, thereby forming the phosphorescent phosphor layer. The thickness of the film layer can be adjusted by adjusting the viscosity of the coating.

Drawings

Fig. 1 is a partial sectional view of a bulb for a bicycle headlamp in accordance with embodiment 1 of the present invention,

fig. 2 is a partial sectional view of an example of assembling a bulb to a bicycle headlamp that is also embodiment 1 of the present invention,

figure 3 is a front view of embodiment 1 of the present invention,

FIG. 4 is a diagram showing the relationship between the film thickness and the relative luminance as in embodiment 1 of the present invention,

fig. 5 is a diagram showing the light path and the light emitting state when the lamp is on and off, which is embodiment 1 of the present invention,

FIG. 6 is a drawing showing the light beam, illuminance, and light emission state at different application positions and application ranges as in embodiment 1 of the present invention,

fig. 7 is a sectional view of an emergency rescue flashlight according to embodiment 2 of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

(embodiment 1)

Fig. 1 is a partial sectional view of a bicycle headlamp bulb according to an embodiment of the present invention. As shown in fig. 1, the light bulb 1 according to the embodiment of the present invention has a rated voltage of 6V and a rated power of 2.4W, for example, and a phosphorescent phosphor layer 5 is formed on the front surface side of the single-hole bulb envelope 2. 3 is a filament for emitting light, 4 is a metal tail base inserted into a lamp holder, and 6 is a terminal for supplying power.

The light-storing phosphor layer 5 uses the above strontium aluminate (SrAl)₂O₄"N night light (LumiNova)" manufactured by Special chemical Co., Ltd.). The luminous color thereof conforms to the human visual acuity, and the emitted light thereof can be effectively recognized. Made of strontium aluminate (SrAl)₂O₄) The formed phosphorescent phosphor layer 5 is mixed with a binder resin and a solvent to prepare a paint, and the paint is applied as a paint to a predetermined position of the lamp bulb. Then, the solvent is removed by drying to form a phosphorescent phosphor layer. As the binder resin, a propylene-urethane resin (S-5010, manufactured by changli special paint co., ltd.) and a solvent including 20 to 30 vol.% of toluene, 20 to 30 vol.% of methyl isobutyl ketone, 20 to 30 vol.% of cellosolve acetate, 10 to 20 vol.% of ethyl acetate, and 10 to 20 vol.% of butyl acetate (a diluent for S-5010, manufactured by changli special paint co., ltd.) were used. The weight ratio of the phosphorescent phosphor to the binder resin to the solvent is 100: 8: 10.

The adopted method is that the single-mouth bulb shell 2 is taken out after being dipped in the coating, and then the solvent is evaporated through natural drying. In addition, the thickness of the coating film layer is adjusted by changing the mixing amount of the solvent.

Fig. 2 is a partial sectional view of an example in which the bulb 1 obtained in the above-described manner is assembled in a bicycle headlamp 20. The bicycle headlamp 20 is formed in an overall shape by a housing 17 and a lens 15, and a bulb 1 is fixed in a socket 7 inside a reflector 16 such that a central axis thereof coincides with a central axis of the reflector 16. The bulb 1 emits light by an alternating current generated by a motor (not shown) in the generator housing 18 to irradiate the front of the lens 15. The ac current generated by the motor flows through the cord 21, the housing 17, the reflector 16 and the lamp socket 7 to the lamp 1. The motor in the generator housing 18 generates an alternating current by the rotational force of the roller 19 that rotates in contact with the tire. The other power terminal 6 of the bulb 1 is provided at the rear portion thereof to be electrically connected to the bicycle body via the dynamo case 18 and the lamp bracket 23. 22 are undulation bars for bringing the rollers 19 into contact with the tyre.

Fig. 3 is a front view as viewed from the front of fig. 2.

Next, the relationship between the change in the emission intensity due to the coating thickness of the phosphorescent phosphor layer and the reduction rate of the luminous flux of the lamp bulb due to the coating thickness of the phosphorescent phosphor layer will be described.

FIG. 4 shows the relative value of the luminance of the phosphorescent phosphor layer with respect to the change in the thickness of the film layer. It is obvious that the luminance increases to some extent with the increase in the thickness of the film layer, but it saturates beyond a certain value. Therefore, even if the thickness of the coated film layer is increased, the light storage property is not improved. On the other hand, the increase in the thickness of the coating layer leads to a decrease in the transmittance of light emitted from the light source, which is disadvantageous for use as illumination. For this reason, the thickness of the coating of the phosphorescent phosphor layer 5 coated on the lamp bulb 1 in FIG. 1 should be selected to an appropriate value.

In this embodiment, the solvent is adjusted so that the thickness of the coating layer 5 is 150 to 250mg/cm²The coating range of the phosphorescent phosphor layer 5 is set to be half of the front surface of the single-hole cell case 2.

This will be described with reference to fig. 5. The lamp in the figure is the same as that in fig. 1, and the detailed parts are omitted for the convenience of explanation.

Fig. 5 shows the optical paths of the lamp of the present embodiment when the bulb is on (a) and immediately after the bulb is turned off (b), and the reflector 16 when viewed from the front. First, a case in which the bulb is turned on in fig. 5(a) will be described. The light emitted from the filament 3 is divided into direct light and transmitted light through the light storing phosphor layer 5. The transmitted light passing through the phosphorescent phosphor layer 5 includes direct light 11 and reflected light 9, and the direct light not passing through the phosphorescent phosphor layer 5 includes reflected light 10 formed by reflecting the light emitted from the filament 3 by the reflecting mirror 16. Most of the forward light is reflected light 10 from the filament 3 without passing through the phosphorescent phosphor layer 5. In addition, the light passing through the phosphorescent phosphor layer 5 is appropriately set in consideration of the coating thickness of the phosphorescent phosphor layer 5 in consideration of the phosphorescent property and the light transmittance as described above.

As described above, it is possible to ensure that there is not much loss of illumination intensity as a whole, and it is possible to use the lamp as a lamp which has no problem in practical use.

Next, a description will be given of a case immediately after the bulb of fig. 5(b) is turned off. The light emitted from the phosphorescent phosphor layer 5 is composed of light 14 emitted from the outer surface of the phosphorescent phosphor layer 5, light 12 reflected by the reflecting mirror 16, and light 13 reflected from the inner surface of the phosphorescent phosphor layer 5 by the reflecting mirror 16, and is irradiated forward of the reflecting mirror 16.

Therefore, when the mirror 16 is viewed from the front, it appears as if the entire mirror 16 emits light, and the visibility can be greatly improved.

FIG. 6 shows the results of comparison by changing the application range and position of the phosphorescent phosphor layer 5. Even if the light storing phosphor layer 5 is coated with the same film thickness over the same large area, the illuminance varies depending on the coating position. From this, it is understood that a larger illuminance can be obtained as the ratio of direct light from the filament 3 that is irradiated forward through the reflector 16 is larger. Therefore, the coating position of the phosphorescent phosphor layer 5 is designed in front of the reflector 16, which is advantageous for reducing the amount of shielding of direct light from the filament 3 to the reflector 16.

The luminous flux, illuminance, and luminous recognizability of the phosphorescent phosphor layer 5 immediately after the lamp is extinguished are all evaluated, and the effect is best in the range of one quarter to one half of the surface area of the lamp bulb when the phosphorescent phosphor layer 5 is coated on the front surface side of the single-necked bulb envelope.

Further, the bulb of the present embodiment does not peel off when being carried by hand or fixed to a socket. Therefore, the bulb of the present embodiment can be used as a bulb for a portable lamp.

(embodiment 2)

Fig. 7 is an example of a bulb of the present invention used in an emergency or disaster flashlight 30. In fig. 7, the bulb 31 is, for example, a bulb having a rated voltage of 2.4V and a rated current of 0.38A, and a phosphorescent phosphor layer 32 is formed on the top outer surface of the single-port bulb. The mirror 33 is provided inside the mirror 33 so that the center axis thereof coincides with the center axis of the mirror 33. The phosphorescent phosphor layer 32 is formed in the same manner as in embodiment 1. The flashlight 30 has a reflector 22 and a front glass 34 on its illuminating portion, and two batteries 35, 36, for example, are housed in a housing 39, the positive pole of which is always in contact with the rear end terminal of the bulb 31. When lighting, the switch 37 is turned on to bring the terminal 38 into contact with the socket, thereby conducting the lamp to the metal tail base.

The flashlight 30 for emergency relief is often placed in a fixed position such as a corner of a room with the bulb 1 facing upward. When the bulb 1 is placed upward, direct light or indirect light from the sun strikes the region of the phosphorescent phosphor layer 32 during the daytime. Even at night, illumination light is also irradiated. Even at night or when a black spot is formed due to power failure caused by a disaster, the location of the flashlight 30 can be recognized by a person because the fluorescent phosphor layer 32 partially emits fluorescent light, and measures such as safety escape can be taken using the flashlight 30.

Further, the bulb of the present embodiment does not peel off when being carried by hand or fixed to a base. Therefore, the bulb of the present embodiment can be used as a bulb for a portable lamp.

As described above, the light bulb of the present invention is provided with the phosphorescent phosphor layer containing the phosphorescent phosphor compound and the binder resin on at least the front surface side of the bulb envelope, and thereby, the light bulb and the portable lamp in which the strength and durability of the phosphorescent phosphor layer are improved and the visibility is improved even when the light bulb is turned off can be provided.

As described above, the present invention has advantages in that safety can be ensured because the visibility when the bulb is turned off is improved.

And these effects can be achieved by merely replacing the bulb without making any special modification to the lighting device, and can be applied not only to the head lamp, flashlight, head lamp, etc. of the bicycle, but also to the disaster relief goods, for example.

Claims (6)

1. A portable lamp having a lamp including a bulb, a phosphorescent phosphor layer provided at least on a front side of the bulb, wherein the phosphorescent phosphor layer contains a phosphorescent phosphor compound and a binder resin, the phosphorescent phosphor layer covers a quarter to a half of a surface area of the bulb, and the lamp is disposed inside a reflector.

2. The portable lamp according to claim 1, wherein the binder resin is contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the phosphorescent phosphor compound.

3. The portable lamp according to claim 1, wherein the thickness of the light accumulating phosphor layer is 150mg/cm²Above, 250mg/cm²The following ranges.

4. The portable lamp according to claim 1, wherein the phosphorescent phosphor compound is an inorganic substance having an emission peak in a wavelength range of about 350 to 700 nm.

5. The portable lamp as claimed in claim 1, wherein the phosphorescent phosphor compound is strontium aluminate (SrAl)₂O₄) As the main component.

6. The portable light fixture of claim 1, wherein the portable light fixture is one selected from a flashlight, a bicycle headlamp, and a headlamp.