JPS60232660A - Discharge lamp - Google Patents

Abstract

PURPOSE:To reduce the temperature rise of startor and capacitor in a casing having reduced size while to reduce the volume of thermally conductive insulator thus to reduce the cost by providing a thermally conductive insulator buried with the startor and the capacitor while contacting with the inner face of casing. CONSTITUTION:Thermally conductive insulator 22 is buried with a startor 11 and a capacitor 12 then contacted against the inner face of the casing 8 while separated from a ballast 10 and a lamp 1. Consequently, thermal effect of ballast 10 onto the startor 11 and the capacitor 12 can be reduced effectively thus to prevent shortening of service life and erroneous function. While the volume of thermally conductive insulator 22 can be reduced without sacrifice of thermal radiation.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a discharge lamp in which a case body having a bulb base is fitted to the bottom of a discharge lamp, and electrical parts such as a ballast are housed inside the case body. It relates to a lamp device.

[Prior art]

Recently, this type of discharge lamp device has become a substitute for incandescent light bulbs.
Figure 1 shows an example with a partial cutout. In Figure 1, il+ is a fluorescent lamp, and this lamp +11 is a spherical bulb with an open bottom (3). (2), a ceramic end plate (4) that airtightly closes the opening of the bottom (3) of this valve (2), and a ceramic end plate (4) that protrudes into the valve (2) at a predetermined position of this end plate (4). A pair of electrodes (5) provided so that the electrodes (Fl)
It is made up of. (7) is a phosphor layer coated on the inner surface of the inner tube (6), (55) is the lead i of the electrode (5) led out to the outside of the lamp fi+, and (8) is the phosphor layer deposited on the inner surface of the inner tube (6). A cylindrical case body with a bottom is fitted and fixed to the bottom part (3) of the lamp, and a light bulb cap (9) is attached to the bottom part (88) of this integrated body.

Lighting circuit components such as a stabilizer, a starter aυ, and a capacitor Qa are housed inside the case body (8), and are appropriately connected to enable lighting.

Since such a discharge lamp device is intended to replace an incandescent light bulb, it is necessary to reduce the overall size, and in particular, it is desirable to reduce the size of the case body (8) that does not contribute to light emission. , a stabilizer Q housed in the case body (8)
If the volume of the case body (8) is reduced, electric components such as l etc. will reach a high temperature, shortening their lifespan, and risking malfunction, so the shape of the force case body (8) has to be enlarged. There were problems such as not being able to obtain the desired results.

In order to solve this problem, the applicant first proposed
No. 8-250297 and Japanese Patent Application No. 58-250293 were proposed. These are the stabilizer rm and the case body (8)
By filling a thermally conductive insulator (2) between
Ballast a [is designed to reduce the size of the case body (8) by effectively dissipating heat from it to the outside and reducing the influence of heat on the electrical components and lamp il+ inside the case body (8) It is.

Figures 2 and 3 were previously filed by this applicant in the patent application filed in 1983-2.
50293 is a partial cross-sectional view showing the discharge lamp device proposed in No. 50293, in which a ballast a
A case body (8) is fixed thereon with an adhesive (91).

The ballast 00) is supported by its iron core 0D, and the starter 11
11 and the capacitor Q2 are attached to the board (11) and housed in the case body (8).The iron core C of the ballast a1 (11 side and the bottom (88) of the case body (8))
A thermally conductive insulator is uniformly filled between the two.

With this configuration, the heat dissipation from the ballast a1 is effective when lighting the base (9) which is normally used upward, and heats the starter aυ and capacitor Q2 inside the case body (8). The case body (81) was made smaller so that it could hold pus from the inside.

However, if one cap 19) is lit horizontally and the starter U and capacitor az are located above the ballast a1, the heat from the ballast a0 will be transferred to the case body (8).
), the starter aυ and capacitor σ2 are heated by natural convection, resulting in problems such as shortening the lifespan of the components and causing malfunctions. Furthermore, since the thermally conductive insulator 013 is expensive, it has also become necessary to reduce the amount of the thermally conductive insulator 013 required.

[Summary of the invention]

This invention was made in view of the above circumstances, and includes a discharge lamp, a case body fixed to the bottom of the discharge lamp, and housing electrical parts such as a ballast, a starter, and a capacitor inside.
Temperature increase in the starter and capacitor inside the compact case body is achieved by providing a thermally conductive insulator which is spaced apart from the discharge lamp and ballast and contacts the inner surface of the case body, and embeds the starter and capacitor. The present invention provides a discharge lamp device that can prevent shortening of life and occurrence of malfunction by reducing the amount of heat conductive insulator, and can reduce costs by reducing the number of stages in which thermally conductive insulators are used.

[Embodiments of the invention]

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

Figure 4 is a partial sectional view of a discharge lamp device showing an embodiment of the present invention. It is an insulator, and the starter housing and capacitor a are buried and in contact with the inner surface of the case body (8), and are separated from the ballast a1 and the lamp (1). Furthermore, in the conventional example shown in FIG. 2, a thermally conductive insulator (2) was filled between the ballast a and the case body (8).

In this example, the thermally conductive insulator (a) is used.

In order to reduce usage, the starter flυ and the capacitor 021 were buried and disposed only so as to be in contact with the inner surface of the case body (8). Other than the above, the configuration was the same as the proposed example. In a discharge lamp device having such a configuration, the surface temperature of the ballast coil (2), starter fiD, and capacitor az when the input power consumption is 17W are compared with those of the proposed example in Table 1. and Table 2. Table 1 shows the case when the cap (9) is lit upward, and Table 2 shows the case when the cap (9) is lit horizontally.

The starter aυ and capacitor a2 are on the upper side. Note that the ambient temperature was 35° C., the power supply voltage was 106 V, and measurements were taken using thermocouple wires when the temperature of each part was stabilized.

Table 2 As is clear from Tables 1 and 2, in the embodiment of the invention, starter I and capacitor tta are
The effect of heat is reduced compared to the proposed example. This shows that it is better to effectively dissipate heat from the starter 0υ and capacitor than from the ballast members.

Also, by filling the space between the ballast a1 and the case body (8) with a thermally conductive insulator, the amount of filling can be reduced by about 40% compared to the proposed example without losing the heat dissipation effect. This makes it possible to reduce costs accordingly.

In addition, the values shown in Table 11 and Table 2 are when the discharge lamp device is lit without being attached to a fixture, and if it is attached to a conventional incandescent lamp fixture, an additional 5°C to 20°C temperature rise is expected. To be able to do it.

In the proposed example, the starter αυ and the capacitor Q2 could have a short lifespan or malfunction, but in the embodiment of the present invention, this risk can be eliminated.

〔Effect of the invention〕

As described above, according to the discharge lamp device of the present invention,
A discharge lamp, a case body fixed to the bottom of the discharge lamp and containing electrical parts such as a ballast, a starter, and a capacitor therein; Equipped with a thermally conductive insulator that embeds the starter and capacitor,
Heat is effectively dissipated from the starter and capacitor inside the compact case, reducing temperature rises to prevent shortened lifespan and malfunctions, as well as reducing the amount of expensive thermally conductive insulators used to reduce costs. This has the effect of reducing the amount of water used.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a conventional discharge lamp device, FIGS. 2 and 3 are partial sectional views of a discharge lamp device proposed by the applicant, and FIG. 4 is an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of the discharge lamp device. In the figure, (II is the discharge lamp, (3) is the bottom of the discharge lamp, aQ is the ballast, aQ is the starter, α2 is the capacitor, (8) is the case body, and @ is the thermally conductive insulator. The same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1

Claims (1)

[Claims] A discharge lamp, which is fixed to the bottom of the discharge lamp. A case body that houses electric components such as a ballast, a starter, and a capacitor, and a thermally conductive insulator that is separated from the discharge lamp and ballast, contacts the inner surface of the case body, and buries the starter and capacitor. A discharge lamp device comprising: