JPS60182604A - Illuminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lighting device that integrates a high-frequency lighting circuit and a lamp.

[Technical background of the invention and its problems] In recent years, as shown in FIG. 1, a synthetic resin cover 2 with a base 1 attached to the apex of one end and an opening at the other end of a substantially spherical cover made of a translucent material have been used. The globe 3 is covered to form an envelope 4,
A device has been developed in which a lamp, for example, a fluorescent lamp 5 and a component 6 of a high-frequency lighting circuit attached to a substrate 7 are integrated into the envelope 4. In order to make this type of device more compact, it is important to increase the mounting density of the circuit components 6 on the board 7. However, there is a problem in that line noise increases when the mounting density of circuit components is increased, and this problem is particularly noticeable in high-frequency lighting circuits.

An example of a circuit using a high frequency lighting circuit is one using a -6 type blocking oscillation circuit.

That is, as shown in Fig. 2, in this device, a smoothing capacitor 13 is connected to an AC power supply 11 via a full-wave rectifier diode bridge circuit 12, and a high-frequency lighting circuit 14 is connected to the smoothing capacitor 13. The fluorescent lamp 1 is connected to the output terminal of the circuit 14 via a current limiting inductor 15, and a starting circuit 16 is connected to the fluorescent lamp 1.
are connected. The high frequency lighting circuit 14 is provided with an oscillation transformer 17 consisting of an autotransformer with common input and output windings, a switching transistor 18, a pace inductor 19, and a base drive circuit 20, and the collector of the transistor 18 is connected to the input and output coils 1117c1 of the transformer 17. The emitter of the transistor 18 is connected to one end of the smoothing capacitor 13 through the feedback winding 1 of the transformer 17.
7C2 to the other end of the smoothing capacitor 13, and further connects the base drive circuit 20 and pace inductor 19 in series to the base of the transistor 18, and connects the base drive circuit 19 and base drive circuit 20 to the base of the transistor 18. A connection point is connected to one end of the smoothing capacitor 13 via a resistor 21.

In such a circuit, if the circuit components on the board 7 are mounted with narrower spacing, the pace inductor 19 will easily pick up slight radiation noise from the oscillation transformer 17, etc., which will be amplified by the transistor 18 and transmitted to the oscillation transformer 17. ,
This becomes radiation noise and is transmitted to the pace inductor 19 again. This effect finally appears as paranormal vibrations,
There was a problem in that this was transmitted to the power supply side as line noise and had an adverse effect on external equipment. Furthermore, due to the high packaging density, the wiring and other circuit components tend to absorb radiation noise due to parasitic vibrations generated in the oscillation transformer 17 and the current limiting inductor 15, which further increases the line noise transmitted to the power supply side. For this reason, in the past, the pace inductor 19 was mounted on the substrate 7 away from the smoothing capacitor 13, the oscillation transformer 17, the current limiting inductor 15, etc., as shown in FIG. Real like this.

Although it is true that line noise can be reduced by mounting the device, the mounting density becomes low, requiring a large substrate 7, which poses a problem in that it is difficult to make the device compact.

[Purpose of the Invention] This invention has been made to solve such problems, and provides an integrated high-frequency lighting circuit and a lamp in a translucent envelope having a base. An object of the present invention is to provide a lighting device that can reduce line noise and can be made more compact.

[Summary of the Invention] The present invention provides a high-frequency lighting circuit comprising at least an oscillation transformer, a switching transistor, a pace inductor connected to the base of the transistor, and a base drive circuit, and a lamp connected to the oscillation transformer of the high-frequency lighting circuit. A lighting device that is integrated into a translucent envelope with a base, in which each component of the high-frequency lighting circuit is mounted on a board, and the pace inductor of the high-frequency lighting circuit is made into a closed magnetic circuit. be.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

The structure and circuit of the lighting device in this embodiment are the same as those shown in FIGS. 1 and 2 described above.

In this embodiment, as shown in FIG. 4, a pace inductor 22 using a toroidal core is used as the pace inductor. As a result, the pace inductor 22
Since the line is formed into a closed magnetic path, there is almost no radiation noise from surrounding circuit components, thereby making it possible to reduce line noise as much as possible. Further, the self-magnetic field emission can be minimized, and the radiation noise from surrounding circuit components affected by this can be reduced. Furthermore, even if the pace inductor 22 is placed quite close to the smoothing capacitor 13, the above-mentioned effect can be obtained, and the required area of the board 7 can be reduced accordingly, and the device can be made more compact. For example, in the past, the distance between the smoothing capacitor and the pace inductor was required to be at least 10 m, but in this embodiment, the distance could be made as close as 2 m.

Next, another embodiment of the invention will be described with reference to the drawings.

Components that are the same as those in the embodiment described above are given the same reference numerals and detailed explanations will be omitted.

This is used as a pace inductor as shown in Figure 5.
A pace inductor 23 using an E-10 core is used, and in this case as well, the pace inductor can be made into a closed magnetic path, and the same effects as in the previous embodiment can be obtained.

In the above embodiment, a single-stone blocking oscillator circuit is used as the high-frequency lighting circuit, but other high-frequency lighting circuits may be used, such as a two-stone transistor inverter circuit called a push-pull circuit.

[Effects of the Invention] As detailed above, according to the present invention, line noise can be reduced in a device in which a high-frequency lighting circuit and a lamp are integrated into a translucent envelope having a base. Accordingly, it is possible to provide a lighting device that can be made more compact and more compact.

4... Envelope, 5... Fluorescent lamp, 6... Circuit component, 7... Board, 13... Smoothing capacitor, 14
...High frequency lighting circuit, 17...Oscillation transformer, 18
...Switching transistor, 22.23...Pace inductor.

Fi2 Figure Kazuo Wakasugi, Commissioner of the Patent Office 1. Indication of the case Japanese Patent Application No. 59-37550 2, Name of the invention Lighting device 3, Person making the amendment Relationship to the case Particularly Applicant (307) Toshiba Corporation 4, Agent 6, Specifications subject to amendment 7, page 7, line 15 of the statement of contents of the amendment. ” and then insert the following father.

■Self

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a light bulb-shaped fluorescent rung, Fig. 2 is a circuit diagram showing a high frequency lighting circuit, Fig. 3 is a perspective view showing an example of conventional circuit component mounting, and Fig. 4 is an embodiment of the present invention. FIG. 4 is a perspective view showing a state in which circuit components are mounted in a 1-meter embodiment of the present invention, and FIG.

Claims (1)

[Claims] At least an oscillation transformer, a switching transistor,
A high frequency lighting circuit having a pace inductor and a base drive circuit connected to the bases of the transistors;
In a lighting device in which the oscillation 1 of the high frequency lighting circuit to the lamp connected to the lance are integrated into a transparent envelope having a cap, each component of the high frequency lighting circuit is mounted on a substrate. A lighting device characterized in that the pace inductor of the high frequency lighting circuit is implemented as a closed magnetic circuit.