JPS6240491Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent lamp device compatible with incandescent lamps.

This type of fluorescent lamp device includes a base that covers the outer periphery of a chassis equipped with a cap, and
A curved tube-shaped fluorescent lamp and a ballast having a roughly saddle shape were mounted on the chassis, and the curved tube-shaped fluorescent lamp and ballast were covered with a globe covered with the base. It has a structure.

However, when the fluorescent lamp and the ballast are integrated into the sealed space inside the globe, the radiant heat from them causes the inside of the globe to reach a considerably high temperature during operation. This causes the mercury vapor pressure inside the lamp to exceed the optimum value, which increases the lamp current, which is undesirable in terms of power saving. Moreover, the ballast also reaches a high temperature due to the Joule heat generated by the increase in the lamp current, which may adversely affect the life of the ballast. As a countermeasure to this, it is possible to reduce the diameter of the bulb and restrict the flow of electrons inside the tube to keep the lamp current low, but this significantly reduces the overall surface area of the bulb, which causes a decrease in light output, and also causes problems in practical use, such as making starting unreliable and causing repeated blinking during starting, or frequent flickering when the ambient temperature is low.

The present invention was developed based on these circumstances, and its purpose is to reduce lamp current without reducing light output or startability, which is advantageous in terms of power saving. It is an object of the present invention to provide a fluorescent lamp device that can prevent the temperature of the ballast from increasing and provide reliable lighting over a long period of time.

The present invention will be explained below based on an embodiment shown in the drawings.

In the figure, reference numeral 1 denotes the main body of the apparatus, which is composed of a chassis 2 made of heat-resistant synthetic resin and a base 3 that covers the outer periphery of the chassis 2. This chassis 2 has a support plate 5 integrally molded on one end of a cylindrical part 4 having a hollow cylindrical shape, and a male threaded part 6 for attaching a base is formed on the outer peripheral surface of the tip side of the cylindrical part 4. At the same time, mounting grooves 7, 7 are formed along the axial direction at two opposing locations on the outer circumferential surface of the cylindrical portion 4 and open at the edge of the opening at the tip.

On the other hand, the base 3 has a substantially bowl-like shape, and fitting protrusions 8, 8 that are removably fitted into the mounting grooves 7, 7 are provided at two opposing locations on one end of the opening edge thereof. It has been done. Therefore chassis 2 and base 3
This means that the fitting protrusions 8, 8 are fitted into the mounting grooves 7, 7 by inserting the cylindrical part 4 into the opening at one end of the base 3, and then the male threaded part 6 is fitted with a threaded type screw such as E26 type. A cap 9 is screwed on, and the opening edge of the cap 9 and a large diameter portion 10 provided midway through the cylindrical portion 4 are connected to each other by pinching the opening edge of one end of the base 3. ing. A substantially spherical light-diffusing globe 11 is removably attached to the opening edge of the other end of the base 3, and the overall appearance is similar to a ball-shaped incandescent light bulb. Note that communication holes 12 are provided at the top of the glove 11 to communicate the inside and outside of the glove 11, and ventilation holes 13 are provided in the circumferential surface of the base 3 to communicate the inside and outside of the base 3.

By the way, stabilizer support walls 14, 1 are provided on the glove side surface of the support plate 5 in the chassis 2.
4 are provided protrudingly, and these stabilizer support walls 14,
A stabilizer 15 is fitted and fixed between 14. Further, a curved tube-shaped fluorescent lamp 16 is attached to the support plate 5 so as to surround the ballast 15 and to be located within the globe 11. The bulb 17 of this curved tube-shaped fluorescent lamp 16 is made by bending a straight glass bulb into a substantially U-shape at the center to form a first curved portion 18, and having both ends thereof bent into a substantially U-shape. A pair of second curved portions 19, 19 are formed by curving in a substantially U-shape in a direction substantially perpendicular to a plane including the character shape, and the whole is curved into a generally saddle shape. Therefore, both ends 20, 20 of this curved tube-shaped fluorescent lamp 16 are located adjacent to each other in the same direction.
0 and 20 are engaged with valve mounting holes 21 and 21 formed in the support plate 5, thereby being supported on the support plate 5. However, the second curved portion 1 of such a curved tube-shaped fluorescent lamp 16
9 and 19 indicate that the passage area of the discharge path 22 in the bulb 17 is different from other parts, that is, the first curved part 18 and the straight pipe part 2.
3... form narrower diameter portions 24, 24 that are narrower than those of 3.... That is, the narrow diameter portions 24, 24
When bending the curved parts 19, 19, the cross-sectional shape is flattened so that it has an oval shape,
In this example, the ratio L/H of the short axis L to the long axis H is
It is set within the range of 70≦L/H≦90 (%).

In addition, the code|symbol 25 is a lighting tube, and 26 is a capacitor|condenser.

According to such a configuration, the second curved portions 19, 19 of the curved fluorescent lamp 16 are connected to the narrow diameter portions 24, 2.
4, the passage area of the discharge path 22 is partially narrowed, so that the electrons flowing inside the tube due to the discharge collide with the inner wall surface of the tube when they are moved to the second curved portions 19, 19. As a result, the amount of electrons passing through the narrow diameter portions 24, 24 is naturally limited. Therefore, since the lamp current is generally determined by the amount of electrons flowing through the discharge path 22, by limiting the amount of electrons passing through as described above, the lamp current can be suppressed without reducing the overall diameter of the bulb 17. be able to. Therefore, even if the mercury vapor pressure increases during lamp operation, the lamp current does not increase as in the conventional case, which is advantageous in terms of power saving. At the same time, the temperature rise of the ballast 15 can also be suppressed, and the life of the ballast 15 is significantly improved. Furthermore, in this case, since the bulb 17 is only partially constricted, there is an advantage that the light output can be maintained at the same level without reducing the surface area of the light emitting portion.
Furthermore, according to the above configuration, the narrow diameter portions 24, 24
can be the coldest part that controls the mercury vapor pressure within the tube, which is related to the efficiency of the fluorescent lamp 16. In other words, when this type of fluorescent lamp device is lit with the base 9 facing upward (actually more than 90% of the lighting is done in this position), the heat generated by the fluorescent lamp 16 and the ballast 15 is , carried by the outside air flowing in through the communication holes 12, . Therefore, the coldest portions of the tube wall that control the mercury vapor pressure of the fluorescent lamp 16 are the narrow diameter portions 24, 24 facing the communicating holes 12, . Here, the communication holes 12,..., 13,..., are provided in the glove 11 and the base 3, but even if the communication holes 12,..., 13,..., are not provided, the small diameter portion 2
4 and 24 closely facing the top of the globe 11, heat convection within the globe 11 and the base 3 can result in the coldest portion. In such a case, the tube inner walls of the narrow diameter portions 24, 24 are closer to the arc of the discharge, so there is a possibility that the temperature rise will be greater than that of the portions other than the narrow diameter portions 24, 24.

However, in the above embodiment, since the cross-sectional shape of the narrow diameter portions 24, 24 is formed into a flat oval shape, when the cross-sectional shape is an oval shape, the cross-sectional area is smaller than when the cross-sectional shape is circular. Even if they are the same, the surface area can be increased, and therefore heat can be dissipated well. For this reason, the narrow diameter portions 24, 24
It becomes possible to maintain the tube wall temperature at an appropriate level, and the mercury vapor pressure of the fluorescent lamp 16 can be maintained at an appropriate level.

In addition, when the lamp current I _L , light output Lm, and ballast temperature C were measured by varying the value of L/H in the narrow diameter portions 24 and 24, the experimental results shown in FIG. 5 were obtained. Ta. In this case, the lamp current I _L , light output Lm, and ballast temperature C are:
It is expressed as a relative value when the value obtained when L/H is 1.0 is taken as 100%. In other words, as is clear from Fig. 5, the above-mentioned effect of constricting the discharge space becomes noticeable when L/H is 90% or less; It can be seen that the lamp current I _L and the ballast temperature C can both be suppressed as the light output Lm remains the same. However, L/H is 70%
If the temperature is less than 1, the discharge space is too narrow, and as a result, starting becomes uncertain, and there is a possibility that the lamp will repeatedly dim during starting, or that flickering may occur if the ambient temperature of the lamp is low. Therefore, in actual use, it is desirable that L/H be 70≦L/H≦90 (%).

Further, in this embodiment, the second bending portions 19, 19
At the time of bending, the second bent portions 19, 19 were flattened to have an oval cross section to form the narrow diameter portions 24, 24, so that the second bent portions 19, 19
The narrow diameter portions 24, 24 can be formed at the same time, and no special process or equipment for forming the narrow diameter portions 24, 24 is required. Therefore, not only the equipment is simplified, but the manufacturing efficiency is also improved, which is convenient for mass production.

In addition, in the above embodiment, the second curved portion is a small diameter portion, but the point is that there should be at least one portion in the middle of the discharge path where the discharge space is narrowed, so for example, the first curved portion or A similar effect can be obtained by providing a narrow diameter section in the straight pipe section, and the cross-sectional shape of the narrow diameter section is not limited to an elliptical shape.

Furthermore, the curved tube-shaped fluorescent lamp according to the present invention is not limited to the saddle-shaped one shown in the above embodiment.
For example, it goes without saying that it may be a U-shaped lamp or a lamp with a loop formed between both ends.

As described above, in the present invention, a curved tube-shaped fluorescent lamp is accommodated in a globe, and at least a part of the discharge path portion of the curved tube-shaped bulb is provided with a narrow diameter portion. According to this, the amount of electrons flowing inside the tube is restricted by the narrow diameter part, so the lamp current can be suppressed without reducing the diameter of the entire bulb, and the mercury vapor pressure increases while the lamp is lit. However, the lamp current does not increase as much as before. Therefore, it is advantageous in terms of power saving, and it is also possible to suppress the temperature rise of the ballast, thereby significantly extending the life of the ballast. Furthermore, in this case, since only a portion of the bulb is constricted, the surface area of the entire light emitting portion does not decrease, and excellent effects such as maintaining the same light output are achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is a sectional view taken along the line - in FIG. This figure is a sectional view taken along the line - in FIG. 2, and FIG. 5 is an explanatory diagram showing changes in lamp current, ballast temperature, and light output when the value of L/H is changed. DESCRIPTION OF SYMBOLS 1... Device main body, 9... Base, 11... Glove, 15... Ballast, 16... Curved tube type fluorescent lamp, 17... Bulb, 18, 19... Curved part (first, first 2), 22...discharge path, 24...
Small diameter part.

Claims (1)

[Claims for Utility Model Registration] (1) A curved tube-shaped fluorescent lamp and a ballast formed by forming a curved part in at least a part of the tube-shaped bulb,
In a fluorescent lamp device which is attached to a device main body having a base, and in which the curved tube-shaped fluorescent lamp and the ballast are covered by a globe covered with the device main body, a discharge path portion of the tube-shaped bulb is provided. A fluorescent lamp device characterized in that at least a portion of the fluorescent lamp device is provided with a narrow diameter portion. (2) A utility model registration request characterized in that the narrow diameter portion provided in the curved portion is located close to the top of the glove and has a flat oval cross-sectional shape. Fluorescent lamp devices as described in scope item (1). (3) Ratio of the short diameter L to the long diameter H of the above narrow diameter part L/H
70≦L/H≦90 (%). The fluorescent lamp device according to claim (2) of the utility model registration.