JP2007194356A - Discharge tube lighting device and transformer core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge tube lighting device, along with a transformer core of the transformer, of which rising of temperature of the transformer is suppressed and the size of the discharge tube lighting device is decreased. <P>SOLUTION: A transformer core 15 is equipped with a central iron core 18 and a yoke 19 connecting between both ends of the central iron core 18. A thick wall 20 whose wall is thicker than other part is formed at the width side edge of the yoke 19. The transformer core 15 is held by four chassis side tabs 16 that are cut and raised at the bottom of a chassis 12 of the discharge tube lighting device 10 while the thick wall 20 abutting with the chassis 12. Four cover side tabs 22 are cut and raised on a cover 13 fixed to the chassis 12. The transformer core 15 is pressed against the chassis 12 by the cover side tabs 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a discharge tube lighting device including a transformer and a transformer core of the transformer.

Conventionally, as this type of technology, for example, there are those disclosed in Patent Literature 1 and Patent Literature 2.
That is, in the thing of patent document 1, in the case which consists of a base part and the cover part fitted to this base part, the coil of a transformer is formed by the frame-shaped transformer restraining part provided in the base part. The part is suppressed. Further, the printed circuit board of the transformer is pressed by a pressing protrusion provided on the cover portion. With this configuration, the transformer can be easily fixed to the base portion without using screws.

Moreover, in the thing of patent document 2, it attached to the leaf | plate spring provided with the ceiling part, the both arms which hold a transformer core from the both sides of a leaf | plate spring, and the hole for screwing to a base board A piece is formed. The pair of transformer cores are fixed to the base plate by elastically pressing the center part of the transformer core held by both arms by the ceiling.
JP-A-8-45747 JP 2000-182847 A

  By the way, conventionally, in a discharge tube lighting device for lighting a discharge tube such as a dielectric barrier discharge lamp, the transformer is fixed to a metal chassis via a bracket and covered with a cover fixed to the chassis. It was. The cover is provided with a wide space for mainly releasing heat generated from the transformer to the outside of the lighting device, and heat dissipation through this space prevents excessive temperature rise of the transformer and power loss. Increase was suppressed. Accordingly, it has been inevitable that the casing of the discharge tube lighting device constituted by the chassis and the cover is enlarged by the space.

  An object of the present invention is to provide a discharge tube lighting device capable of suppressing the temperature rise of the transformer and reducing the size of the discharge tube lighting device, and a transformer core of the transformer.

  In order to achieve the above object, the invention according to claim 1 is directed to a discharge tube lighting device in which a transformer core having a central core portion and a yoke connecting both ends of the central core portion is fixed to a base member. And the width side edge of the yoke is brought into contact with the base member. According to such a configuration, the heat generated in the transformer is directly transmitted from the yoke that contacts the base member to the base member, and further escaped from the base member to the outside of the discharge tube lighting device. For this reason, the transformer core is efficiently cooled without providing a large space for heat dissipation in the casing of the discharge tube lighting device. Accordingly, the temperature rise of the transformer can be suppressed and the discharge tube lighting device can be downsized.

  In addition to the invention described in claim 1, the invention described in claim 2 is formed with a thickened portion that is thicker than the other portions on the width side edge of the yoke, and this thickened portion. Is brought into contact with the base member. According to such a configuration, the heat of the transformer core is efficiently released to the base member through the wider contact surface of the thick part of the yoke. Here, since the thickness of the thick part of the width side edge in the yoke of the transformer core is only thicker than the other parts, the volume of the transformer does not increase so much. For this reason, since the cooling efficiency of the transformer core is improved and the temperature rise of the transformer is further suppressed, the discharge tube lighting device can be further downsized.

  According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, the base member is formed from a metal plate and a claw portion is cut and raised, and the transcore is positioned and held by the claw portion. It is characterized by that. According to such a configuration, there is no need for a separate part for fixing the transformer core to the base member, so there is no need to provide a space for mounting the separate part around the transformer. For this reason, the number of parts and the number of assembly steps can be reduced, and the discharge tube lighting device can be downsized.

  According to a fourth aspect of the present invention, in addition to the third aspect of the present invention, a lid formed from a metal plate and fixed to the base member is provided. The transformer core is pressed against the base member. According to such a configuration, the transformer core can be reliably fixed inside the casing constituted by the base member and the lid.

  According to a fifth aspect of the present invention, in a transformer core including a central core portion and a yoke connecting both ends of the central core portion, the width side edge of the yoke is made thicker than other portions. A thick part is formed. According to such a configuration, by fixing the transformer core to the base member while the yoke is in contact with the base member, the heat of the transformer core is efficiently transmitted to the base member through the contact surface between the yoke and the base member. Is done. Here, in the transformer core, the thickness of the thick portion formed at the edge on the width side of the yoke is only thicker than that of the other portions, so the volume of the transformer does not increase so much. For this reason, the cooling efficiency of the transformer core is improved and the temperature rise of the transformer is further suppressed, so that the discharge tube lighting device can be further reduced in size.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, each of the thick portions is formed so as to increase in thickness by projecting toward the central core portion side. Features. According to such a configuration, since the thick portion does not protrude outward from the yoke, the volume occupied by the transformer in the casing of the discharge tube lighting device does not increase, which is advantageous for downsizing the casing.

  According to the present invention, it is possible to provide a discharge tube lighting device capable of suppressing the temperature rise of the transformer and reducing the size of the discharge tube lighting device, and a transformer core of the transformer.

Next, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, the discharge tube lighting device 10 includes a chassis 12 as a base member to which an inverter (not shown) and a transformer 11 are fixed. It is supposed to be fixed. The chassis 12 and the cover 13 are both press-molded from a conductive metal plate, and constitute a casing 14 of the discharge tube lighting device. The discharge tube lighting device 10 converts the direct current supplied from the battery into alternating current by an inverter, then boosts the alternating current by the transformer 11 and outputs it to a discharge tube (not shown).

  As shown in FIG. 2, four chassis side claws 16 for fixing the transformer core 15 of the transformer 11 are cut and raised toward the inside of the chassis 12 at the bottom of the chassis 12. The transformer core 15 is positioned and held on the inner surface of the bottom of the chassis 12 by being sandwiched by the four chassis side claws 16. Further, the transformer core 15 is configured by abutting a pair of half-core bodies 17 having the same shape, and connects between a central core portion 18 provided with a primary coil and a secondary coil (not shown) and both ends of the central core portion 18. A pair of plate-like yokes 19 is provided. A space is formed between the central iron core 18 and the yoke 19.

  As shown in FIGS. 4 and 5A, 5B, the lower end edge in the width direction (vertical direction in FIG. 4) of the yoke 19 is thicker than the other portions. 20 is formed. The thick part 20 is formed so as to increase in thickness by projecting toward the central core part 18 side toward the lower side. As shown in FIGS. 3A and 3B, the transformer core 15 is positioned and held by the chassis-side claw portion 16 in a state where the thick portion 20 is in contact with the inner surface of the bottom portion of the chassis 12. The Note that, at the connection portion between the central core 18 and the yoke 19 on the upper side of each half-core body 17, the yoke 19 is formed with a notch 21 for arranging the terminals of the primary coil or the secondary coil. Yes.

  As shown in FIG. 2, the cover 13 has four cover side claws 22 for pressing the transformer core 15 positioned on the bottom inner surface of the chassis 12 against the chassis 12. It has been cut up. The cover 13 has an opening 22 a corresponding to each cover-side claw portion 22. As shown in FIG. 3B, each cover side claw portion 22 abuts on the upper surface of the yoke 19 of the transformer core 15 in a state where the cover 13 is fixed to the chassis 12. Therefore, the transformer core 15 is fixed and held in the housing 14 by the chassis side claw portion 16 and the cover side claw portion 22. Further, the cover 13 is formed with a net-like opening 23 for releasing heat generated by the transformer 11 and the inverter to the outside of the housing 14 over a wide range.

  Now, with the power supply to the discharge tube (not shown), the temperature of the transformer core 15 rises due to heat generation, iron loss, etc. of the primary coil and the secondary coil. The heat of the transformer core 15 is efficiently released to the chassis 12 side through the wide contact surface of the thick portion 20 that contacts the upper surface of the bottom of the chassis 12. In addition, the heat of the transformer core 15 is efficiently released to the chassis 12 and the cover 13 through each chassis side claw portion 16 and each cover side claw portion 22 that respectively contact the transformer core 15. At this time, since each cover side claw part 22 to which heat is transmitted from the transformer core 15 faces the opening part 22a, the heat radiation efficiency is further improved. Furthermore, the heat of the transformer core 15 is also released to the outside of the casing 14 through the air in the casing 14 from each opening 22a facing the transformer core 15 and the net-like opening 23. For this reason, an excessive temperature rise of the transformer core 15 is suppressed, and an increase in power transmission loss is suppressed.

Next, effects of the embodiment described in detail above will be listed.
(1) According to this embodiment, the heat generated in the transformer 11 is efficiently released to the thermally conductive chassis 12 through the thick portion 20 formed on the lower end edge of the yoke 19 in the transformer core 15. Therefore, since it is not necessary to provide a large space for heat radiation from the transformer 11 in the housing 14, the discharge tube lighting device 10 can be reduced in size.

  (2) The transformer core 15 is positioned and held by a plurality of chassis side claws 16 cut and raised at the bottom of the chassis 12 made of a metal plate, and the transformer core 15 is also cut by a plurality of cover side claws 22 cut and raised in the cover 13. Was pressed against the chassis 12 side. Therefore, unlike the configuration of Patent Document 2 described above, a separate part for fixing the transformer core 15 to the chassis 12 is not required, and there is no need to provide a space for mounting the separate part around the transformer core 15. For this reason, the number of parts and the number of assembly steps can be reduced, and the discharge tube lighting device 10 can be further downsized.

  (3) The thick portion 20 is formed so as to increase in thickness by protruding toward the central iron core portion 18 side. Therefore, even if the thick portion 20 is provided, the transformer core 15 does not protrude outward from the yoke 19 and the volume occupied in the housing 14 does not increase, which is advantageous for downsizing the housing 14.

  (4) Since the thick portion 20 is formed only at the lower end edge of the yoke 19, the upper side of the transformer core 15 is opened with the same size as the conventional one. For this reason, even if the thick part 20 exists, the assembly | attachment operation | work of the primary coil and the secondary coil to the center iron core part 18 remains easy.

In addition, this invention can also be changed and embodied as follows.
A thick portion 30 similar to the thick portion 20 is provided on the upper edge of the yoke 19 in the transformer core 15 as shown by a two-dot chain line in FIG. The transformer core 15 is pressed against the chassis 12 by contacting the inner surface of the cover 13. In this case, the heat of the transformer core 15 is efficiently radiated to the cover 13 through the thick portion 30 in addition to being efficiently radiated to the chassis 12 through the thick portion 20. Therefore, since the cooling efficiency of the transformer core 15 is further improved and the temperature rise of the transformer core 15 is further suppressed, the space in the housing 14 can be made smaller and the discharge tube lighting device 10 can be further downsized. .

The present invention is embodied in the discharge tube lighting device 10 including the transformer core 15 that does not include the thick portion 20.
The present invention is embodied in a cold cathode tube, a hot cathode tube, or a general fluorescent lamp lighting device.

Hereinafter, the technical idea grasped from the above embodiment will be described.
The discharge tube lighting device according to claim 3, further comprising a lid formed of a metal plate and fixed to the base member, wherein the transformer core is pressed against the base member by an inner surface of the lid. A discharge tube lighting device. According to this configuration, the temperature rise of the transformer core can be further suppressed, and the discharge tube lighting device can be further downsized.

The disassembled perspective view which shows the discharge tube lighting device of one Embodiment. The disassembled perspective view of the discharge tube lighting device which similarly shows the principal part. (A) is a top view of a discharge tube lighting device, (b) is the sectional view on the aa line in (a). The perspective view which shows the half core body in a transformer core. (A) is a longitudinal cross-sectional view of a transformer core, (b) is a longitudinal cross-sectional view in another position similarly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Discharge tube lighting device, 11 ... Transformer, 12 ... Chassis as base member, 13 ... Cover as cover, 15 ... Transformer core, 16 ... Chassis side claw part as claw part, 18 ... Central iron core part, 19 ... Yoke, 20 ... thick part, 22 ... cover side claw part as claw part, 30 ... thick part.

Claims (6)

In a discharge tube lighting device in which a transformer core having a central core part and a yoke connecting both ends of the central core part is fixed to a base member,
A discharge tube lighting device characterized in that a width side edge of the yoke is brought into contact with the base member.   The thick part which was made thicker than the other part was formed in the width side edge of the yoke, and this thick part was made to contact the base member. Discharge tube lighting device.   3. The discharge tube lighting device according to claim 1, wherein the base member is formed of a metal plate, a claw portion is cut and raised, and the transformer core is positioned and held by the claw portion.   The lid according to claim 3, further comprising: a lid formed from a metal plate and fixed to the base member, wherein the transformer core is pressed against the base member by a claw portion cut and raised in the lid. Discharge tube lighting device. In a transformer core comprising a central iron core and a yoke connecting both ends of the central iron core,
A transformer core, characterized in that a thick portion, which is thicker than other portions, is formed at the width side edge of the yoke.   6. The transformer core according to claim 5, wherein each of the thick portions is formed so as to increase in thickness by projecting toward the central core portion side.

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