JPS6241364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge lamp device that can obtain light of a plurality of types with a single discharge lamp.

In a conventional discharge lamp device, for example, as shown in FIGS. 1 and 2, two types of phosphor layers 3 and 4 are distributed and deposited on the inner wall of a glass tube 2 of a fluorescent lamp 1. By attaching it to the main body 5, two types of light are obtained. That is, as shown in FIG. 1, when the fluorescent lamp 1 is attached to the main body 5 and turned on, most of the light that is effective for indoor irradiation is emitted from the phosphor layer on the side facing the irradiation surface, that is, the phosphor layer. In FIG. 1, the light is emitted from the phosphor layer 4. Therefore, by attaching the phosphor layer 4 to the main body 5 with the phosphor layer 4 facing downward, it is possible to provide indoor lighting similar to a fluorescent lamp using only the phosphor layer 4; Lamp 1 to 180
By rotating the phosphor layer 3 so that the phosphor layer 3 is facing downward, it is possible to provide indoor lighting similar to a fluorescent lamp using only the phosphor layer 3.

However, in the above-mentioned conventional discharge lamp device, even if the phosphor layer 4 is directed downward as shown in FIG. 1 to obtain only the light from the phosphor layer 4, the discharge area within the fluorescent lamp 1 is approximately Since the phosphor layer 3 is uniform, it also emits light, and the light from the phosphor layer 3 is reflected inside the tube and comes out downward, and after being irradiated outward from the phosphor lamp 1, the light from the phosphor layer 3 is emitted. Since the light from the phosphor layer 3 is mixed with the light from the phosphor layer 4 because it is reflected from the ceiling surface and illuminates the downward direction, it is not only extremely difficult to adjust the emitted light color, but also because the phosphor layer In order to obtain only light from layer 4, the efficiency had to be poor.

On the other hand, as shown in FIGS. 3 and 4, two electrodes 6 and 7 are provided at one end of the fluorescent lamp 1, and electrodes (not shown) at the other end opposite to the electrodes 6 and 7 are connected to each other. A separation wall 8 is provided in the glass tube 2 to separate the discharge paths 9 and 1 from each other.
A discharge lamp device has also been proposed in which different luminescent layers 11 and 12 are applied to the discharge paths 9 and 10, and the color of the emitted light is changed by mutually adjusting the current flowing through the discharge paths 9 and 10. The manufacturing method of the lamp 1 is extremely complicated, and since the fluorescent lamp 1 has two pairs of electrodes, the lighting circuit also needs to be devised.

The present invention has been made in view of the above-mentioned drawbacks.
The purpose is to provide a discharge lamp device that can change light properties such as light color without complicating the structure.

The present invention will be explained below based on embodiments shown in the figures.

FIG. 5 shows a first embodiment of the present invention. In the figure, 13 is a discharge tube, and the inner circumferential surface of the tube wall of the discharge tube 13 has a light quality mark for determining the light properties of the discharge tube 13. Three types of phosphor layers 14a, 14 as determinants
b and 14c are deposited on the tube wall portion on the opposite side of the tube axis across the tube axis from the tube wall portion on which the phosphor layer 14b is coated. A rod-shaped magnet 15 serving as a magnetic field generating means is disposed outwardly over the length of the discharge tube 13. The magnet 15 is detachable in order to change the amount of magnetism received at a predetermined position within the discharge tube 13 corresponding to the phosphor layer.

In an embodiment with such a configuration, as shown in FIG. 6, a magnetic field by the magnet 15 is applied in a direction perpendicular to the tube axis of the discharge tube 13, and the strength H of the magnetic field is determined by the distance L from the magnet 15. As the size increases, it decreases exponentially, and relatively magnet 1 in the tube cross section
The magnetic field is large in the region 16 close to the magnet 15, and small in the region 17 far from the magnet 15. Therefore, compared to region 17, the Lorentz force that electrons receive is stronger in region 16, and region 16 becomes a space where it is difficult for charges to pass through.
The discharge area 18 will be biased towards the area 17. As a result, the rate of ultraviolet rays reaching the phosphor layers 14a and 14c is significantly reduced, while the phosphor layer 14
A large amount of ultraviolet rays enter b, and the phosphor layer 14b is strongly irradiated downward in FIG. Next, when the magnet 15 is moved away from the discharge tube 13 and the amount of magnetism received at each position in the tube is zero, the discharge area 18
is applied uniformly within the discharge tube 13, so the phosphor layers 14a, 14b, and 14c all emit light,
In the lower part of the figure, the color of the phosphor layer 14b corresponds to the color of the phosphor layer 14b.
A color that looks like a mixture of colors 4a and 14c is obtained.

As a specific example of such an embodiment, a magnet 15 is provided above the discharge tube 13, and the color temperature is
A phosphor layer made of calcium halophosphate with a color temperature of about 3000 or less is deposited, a phosphor layer made of calcium halophosphate with a color temperature of about 6500 or more is deposited on the upper half, and the magnetic field strength of the magnet 15 is set to an appropriate level. If the value of is selected, a warm white light color of about 3,500 to 4,000 degrees will be obtained below the discharge tube 13, while daylight color of about 5,000 to 6,000 degrees will be obtained if the discharge tube 13 is reversed around the tube axis. When the color is obtained and the magnetic field is removed, it becomes 4500 to 5000.
We were able to obtain a white-like light color.

FIG. 7 shows a second embodiment of the present invention, in which two rod-shaped magnets 15a, 15b are provided at different positions above the circumference only in the cross section of the discharge tube 13, and the space between the magnets 15a, 15c is The magnetic field lines 19 are the discharge tube 13
Discharge tubes 1 with different polarities cross the discharge path 18 inside.
The other pole on the non-discharge lamp side is yoke 2.
They are connected to each other by 0. and magnet 15
a and 15b are detachable so as to change the strength of the magnetic field at each position within the tube corresponding to the phosphor layer.

In the second embodiment, the magnetic lines of force 19 mainly pass through the upper part of the discharge tube 13 as shown in the figure, so the discharge area 18 is biased towards the lower part of the tube where the magnetic field is weaker, and the phosphor attached to the inner surface of the tube wall The color of the emitted light can be changed depending on the layer as in the first embodiment, but in this embodiment in particular, when a magnetic field is applied, the difference in magnetic field between the discharge region 18 and the inside of the tube other than the discharge region 18 is is much larger than the difference in magnetic field in the first embodiment, so there is a special effect that the discharge area 18 can be more unevenly distributed and the color change becomes more clear.

FIG. 8 shows a third embodiment of the present invention, in which removable magnets 15a and 15b are provided at both ends of the tube so that a magnetic field is applied in the tube axis direction. The two faces face each other with a yoke 20 in between, and the other faces are connected to each other by a yoke 20.

In this third embodiment, the direction of the electric field inside the discharge tube 13 having a plurality of phosphor layers is parallel to the direction of the magnetic field generated by the magnets 15a and 15b outside the tube, but the portion where the magnetic field is strong is located in the discharge region 18. becomes.
This is because the charge trying to move toward the tube wall receives the Lorentz force and moves circularly around the magnetic flux, so the probability of recombination with positively charged ions near the tube wall becomes extremely small, and therefore the magnetic field decreases. This is thought to be because discharge is much easier to occur than in weaker parts.

Note that the magnetic receiving amount variable means does not have to be a means for attaching and detaching the magnet 15, but by fixing the magnet 15 and making the discharge tube 13 rotatable around the tube axis, it can be fixed at a predetermined position in the tube corresponding to the phosphor layer. The amount of magnetism received at the discharge tube 13 may be changed, or conversely, the discharge tube 13 may be fixed while the magnet 15 may be moved along the wall or end surface of the discharge tube 13. Actually, in the first embodiment shown in FIG. 5, the phosphor layer 14b is a blue phosphor such as magnesium tungstate, the phosphor layer 14c is a green phosphor such as zinc silicate, and the phosphor layer 14c is a green phosphor such as zinc silicate. 14a are each made of a red phosphor such as magnesium arsenate, and when the discharge lamp 13 is gradually rotated to the left around the tube axis with respect to the magnet 15 fixed above, the downward irradiation light is blue. It was possible to obtain a gradual change in almost all the colors, from green to red, and even when the discharge tube 13 was fixed and the magnet 15 was moved to the right along the tube wall, Although the irradiation direction changed, the same color change could be obtained. Furthermore, it is of course possible to use the magnet 15 as a magnetic field generating means that can change the strength of the magnetic field to change the amount of magnetism received at a predetermined position in the discharge tube 13 corresponding to the phosphor layer.

Furthermore, the light quality determining body referred to in the present invention may be any substance as long as it determines the properties of light as described above, and it does not need to be in close contact with the tube wall; for example, a portion of the tube wall may be simply made of glass. It is also possible to coat other parts with a phosphor layer and use it as both a fluorescent lamp and a germicidal lamp, and even if you want to change the color of the light, you can use a filter etc. You can also attach it separately to the outside of the wall and change the color.

Furthermore, the magnetic field generating means may be other than a permanent magnet, and may of course be provided inside the tube wall.

As described above, the present invention provides a magnetic field generating means, a discharge tube in which at least one of the inner and outer surfaces of the tube wall receiving the magnetic field generated by the magnetic field generating means is covered with a plurality of types of light quality determining bodies; Since it is composed of a magnet receiving amount variable means that changes the strength of the magnetic field at a predetermined position in the discharge tube corresponding to the body, two or more different types of light with different properties can be generated by simply changing the discharge path in the tube with the magnetic field. It has the remarkable effect of improving the luminous efficiency and light distribution performance due to the uneven distribution effect of the discharge area due to the magnetic field, and furthermore, the desired light can be easily obtained by means of varying the amount of received magnetism. be.

[Brief explanation of the drawing]

Figures 1 to 4 show conventional discharge lamp devices. Figure 1 is an external view of the discharge lamp device, Figure 2 is a sectional view of the same, and Figure 3 is a diagram of a different conventional discharge lamp device. FIG. 4 is a partially cutaway perspective view, and FIG. 4 is a sectional view thereof. 5 to 8 show embodiments of the present invention. FIG. 5A is a schematic cross-sectional view of the first embodiment, FIG. 5B is a schematic side view, and FIG. FIG. 7 is a schematic cross-sectional view of the device showing the second embodiment of the present invention, and FIG. 8 is a side view of the device showing the third embodiment. It is a schematic diagram. 13... Discharge tube, 14a, 14b, 14c... Fluorescent layer, 15, 15a, 15b... Magnet, 18... Discharge area, 19... Line of magnetic force, 20... Yoke.

Claims (1)

[Claims] 1. A magnetic field generating means, a discharge tube in which at least one of the inner and outer surfaces of the tube wall receiving the magnetic field generated by the magnetic field generating means is covered with a plurality of types of light quality determining bodies, and a portion within the discharge tube corresponding to the light quality determining body. A discharge lamp device comprising: magnetic receiving amount variable means for changing the strength of the magnetic field at a predetermined position.