JPH0615365Y2 - Ballast for discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a ballast for a discharge lamp in which a ballast body is housed in a case.

(Prior Art) In a conventional ballast in which a ballast main body 51 is housed in a case 52, as shown in FIG. 6, a protective device 53 for shutting off electricity to the discharge lamp circuit when the temperature becomes high. The ballast body 51
There is one that is arranged between the case and the case 52.

(Problems to be solved by the invention) However, the conventional protection device 53 is simply replaced with the ballast body 51 and the case.
Since it was inserted between 52 and 52, protector 53 is the ballast main body
51 is not tightly fixed to the 51, so the protective device 53 is in an unstable state between the ballast body 51 and the case 52,
A large gap may be created between the ballast main body 51 and the protective device 53, and the heat transfer from the ballast main body 51 to the protective device 53 may be deteriorated. Therefore, even if the ballast becomes abnormal. The function of the protection device 53 is not fully exerted, and in the worst case, there is a problem that the ballast is burned out.

In view of the above-mentioned problems, the present invention is designed so that the protective device 53 can sufficiently exert its function to reliably protect the ballast.

(Means for Solving the Problem) The technical means of the present invention for solving this technical problem is to protect the ballast body 1 from being housed in a case 31 and shutting off electricity to the discharge lamp circuit when the temperature becomes high. The device 38 is the ballast body 1
In the discharge lamp ballast arranged between the case 31 and the case 31, a pressing piece 41 is projected inside the case 31 so as to press the protective device 38 against the ballast main body 1.

(Operation) The pressing piece 41 presses the protective device 38 toward the ballast main body 1 side, and the protective device 38 comes into close contact with the ballast main body 1. As a result, the heat of the ballast main body 1 is surely transferred to the protective device 38. In addition, the protective device 38 operates reliably and thus exhibits its protective function sufficiently.

(Embodiment) Hereinafter, the present invention will be described with reference to the illustrated embodiment.
In FIG. 4 to FIG. 4, 1 is a ballast body, which is a letter-shaped laminated iron core 2, a pair of coil bobbins 3 and 4, and a secondary coil 5.
And a primary coil 6. Secondary coils 5 and 1
The secondary coil 6 is wound around the central magnetic path 14 of the iron core 2 via coil bobbins 3 and 4, respectively. The coil bobbins 3 and 4 include a rectangular tube-shaped body portion 12 and 13 that is fitted onto the central magnetic path 14 of the iron core 2, and a pair of flange portions 7 and 8 that project radially from both ends of the body portion 12 and 13. 9,1
Has 0 and. The coil bobbins 3 and 4 may be integrated or may be separately formed. Reference numeral 11 denotes a metal tightening cover that is tightly fitted to both ends of the iron core 2.

Terminals 15 and 16 are provided on the coil bobbins 3 and 4, and the collar 7,
Each of the 10 is integrally projecting outward. 17,18 are terminals,
The terminal mounting portions 15 and 16 are fitted to each other so as to project outward.

21 is a board placed near the ballast main body 1.
The terminals 17 are fitted and held on the lower surface side of the. 22 is a noise preventing capacitor, 23 is a phase advancing capacitor, the noise preventing capacitor 22 is arranged on the substrate 21, and the phase advancing capacitor 23 is arranged on the noise preventing capacitor 22.

The pair of lead wires 27 of the phase advancing capacitor 23 are connected to the substrate 21.
Is vertically inserted into the terminal 17, and is soldered to the terminal 17 on the back surface side of the substrate 21.

Further, the pair of lead wires 28 of the noise preventing capacitor 22
Are vertically inserted into the board 21, and are soldered to the terminals 17 on the back surface side of the board 21, respectively.

Reference numeral 31 denotes a ballast case that houses the ballast body 1, and includes a tubular case body 32 and a bottom lid 33 that is fitted into the case body 32 so as to close the one end opening 34 of the case body 32. This bottom lid 33
Is made of synthetic resin, and the terminal 18 is inserted into and held by the bottom lid 33 so as to project outward. Reference numeral 36 denotes a plurality of projecting pieces provided on the bottom lid 33, which are integrally projectingly provided on the inside of the bottom lid 33, the tips of which are brought into contact with the tightening cover 11 of the ballast body 1 and the ballast body 1 and the bottom. A constant space is formed between the lid 33 and the lid 33.

38 is a protective device that shuts off the power to the discharge lamp circuit when it gets hot, and the tightening cover 11 of the ballast body 1 and the ballast case
It is arranged between 31 and the bottom lid 33. The pair of lead wires 39 of the protection device 38 are inserted into the terminals 18, respectively, and solder 40 is attached to the back surfaces of the terminals 18, respectively.

Reference numeral 41 denotes a pressing piece provided on the bottom lid 33, which is integrally provided so as to project inside the bottom lid 33 and holds the protective device 38 against the tightening cover 11.

A compound 43 is provided in the ballast case 31, and is filled between the ballast case 31, the ballast body 1, the capacitors 22 and 23, and the protective device 38.

FIG. 5 shows a circuit configuration of a discharge lamp lighting device. A discharge lamp 45 and an AC power supply 46 are connected to the ballast body 1, and a protective device 38 is interposed between the ballast body 1 and the power supply 46. .

In the above embodiment, the protective device 38 is provided between the ballast body 1 and the bottom lid 33 of the ballast case 31, and the pressing piece 41 is provided on the bottom lid 33, but instead of this, the ballast body is provided. Between the coil 5 or coil 6 of 1 and the case main body 1, a protection device 38
Alternatively, the pressing piece 41 may be provided so as to project inside the case body 32.

(Effect of the Invention) According to the present invention, since the pressing piece 41 is provided so as to press the protective device 38 against the ballast main body 1 inside the case 31, the protective device 38 is attached to the ballast main body 1. It can be fixed tightly against
The heat of the ballast main body 1 is smoothly transferred to the protective device 38, so that the protective device 38 operates reliably, and the burnout prevention of the ballast becomes more complete. Moreover, since the case 31 is simply provided with the pressing piece 41 in a projecting manner, the structure can be simplified, the manufacturing can be facilitated, and the cost can be provided at a low cost, and its practical effect is remarkable.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a side sectional view, FIG. 2 is a plan sectional view, FIG. 3 is a plan sectional view of the whole, and FIG. A sectional view and FIG. 5 are electric circuit diagrams. FIG. 6 is a side sectional view showing a conventional example. 1 …… Ballast body, 31 …… Ballast case, 38 …… Protective device, 41 …… Pressing piece.

Claims (1)

[Scope of utility model registration request] 1. A ballast body (1) is housed in a case (31),
In the discharge lamp ballast in which the protective device (38) that shuts off the electricity to the discharge lamp circuit when it becomes hot is placed between the ballast body (1) and the case (31), the case (31) A ballast for a discharge lamp characterized in that a pressing piece (41) is provided so as to press the protective device (38) against the ballast main body (1) inside the ballast.