JP4165819B2 - WIRE WIRING SYSTEM AND VEHICLE LAMP - Google Patents

Description

  The present invention relates to a vehicular lamp, and more specifically, high output is achieved and power consumption per unit is increased. As a result, the temperature rise in individual LED lamps becomes remarkable, and the lighting is turned on. The present invention relates to a configuration of a vehicular lamp that uses an LED lamp as a light source and requires temperature management.

When a conventional LED lamp is used as the light source, the LED lamp is attached to the vehicle lamp by providing a tab-shaped portion parallel to the resin lamp base on the lead terminal which is a leg portion of the LED lamp. In addition, a mounting hole is provided in the parallel tab-shaped portion, and in addition, a boss that can be inserted into the mounting hole is provided in the lamp base, and the boss is inserted into the mounting hole and heated. There are some which attach an LED lamp to a lamp body by performing caulking. (For example, refer to Patent Document 1.)
JP 2000-251504 A (paragraphs 0008 to 0022, FIGS. 1 to 5)

  However, in the above-described conventional configuration, since the LED lamp is directly attached by thermal caulking at the lead terminal, there is a high possibility that stress is applied to the lead terminal at the time of attachment, and this stress causes the resin case of the LED lamp. As a result, the airtightness of the LED chip is lost due to, for example, peeling between the lead terminal and the lead terminal.

  Further, in recent years, there is a strong demand for an increase in the amount of light for the LED lamp, and thus there is a tendency for the power consumption per LED lamp to increase. For this reason, the temperature rise of the LED lamp at the time of lighting becomes remarkable. With this configuration, for example, an LED lamp installed near the center of a vehicle lamp makes it difficult to dissipate heat, resulting in a decrease in the amount of light or a shortened life, and both performance and reliability are reduced. The point also causes problems.

The present invention is a wiring system for constructing a lighting circuit on a lamp body base as a specific means for solving the above-described conventional problems, and this wiring system is formed in a substantially cylindrical shape by a metal member. A light source part in which an LED chip is mounted on an element substrate that can be used as an electrode on its side surface to form an LED lamp, and a lighting circuit is configured on the lamp base with appropriate attachment means. A conductive portion formed by pressing a metal plate material having an appropriate thickness for electrical conductivity and thermal conductivity. The light source portion and the conductive portion have an inner diameter on the conductive portion side and the light source portion. solve a holding in a predetermined position of the light source portion in surface contact with the outer diameter of the element substrate, and the power supply, the problem by providing a wiring system of the lamp, characterized by being configured to perform a heat radiation It is intended.

According to the present invention, there is a wiring system for constructing a lighting circuit on a lamp base. This wiring system is formed in a substantially cylindrical shape by a metal member, and the side surface thereof is made usable as an electrode. A light source section in which an LED chip is mounted on an element substrate to form an LED lamp, and a lighting circuit is configured with appropriate engagement means on the lamp base, and an appropriate plate thickness for conductivity and thermal conductivity The light source part and the conductive part have an inner diameter on the conductive part side and are in surface contact with the outer diameter of the element substrate of the light source part. and holding to the position, and the feed, that was the lamp wiring system, characterized in that it is configured to perform a heat radiation in the light source unit (LED lamp) side, the shape of the element substrate, proper such dimensions It is possible to optimize the shape and size of the conductive part on the lamp side, and to efficiently transfer the heat generated in the light source part to the conductive part and dissipate the heat in the conductive part. Extremely excellent effect that enables the realization of LED light source lamps that have increased power consumption per unit and that make it difficult to dissipate heat in the light source unit (LED lamp) itself without causing problems such as a reduction in light intensity and shortening of service life. It plays.

  Below, this invention is demonstrated in detail based on embodiment shown in a figure. 1 is a wiring system for a vehicular lamp according to the present invention, and the wiring system 1 for the vehicular lamp (hereinafter abbreviated as “wiring system 1”) includes a light source unit 2, a conductive unit 3, The power supply unit 4 is provided as necessary (see FIG. 4), and is installed on a lamp base 11 that is a housing of the vehicular lamp 10, for example.

  First, the light source unit 2 is a so-called LED lamp. However, the power consumption per unit is increased, so that the temperature rise at the time of lighting becomes remarkable, and the necessity of the cooling means is increased. The present invention has a unique shape in order to systematically cope with a recent LED lamp that has become larger due to an increase in power consumption and has become difficult to mount on the lamp base 11 with the conductive portion 3.

  FIG. 2 shows the configuration of the light source unit 2. The basic configuration of the light source unit 2 is a pair of element substrates 21 and 22 formed of metal members and LEDs attached to the element substrates 21 and 22. A chip 23 and a resin case 24 made of a transparent resin for shielding the LED chip 23 from the outside air are formed. The element substrates 21 and 22 are called lead frames in the ready-made LED lamps.

  In order to supply electric power to the LED chip 23, the element substrates 21 and 22 are composed of a pair of a positive electrode element substrate 21 and a negative electrode element substrate 22 as in the conventional lead frame. The LED chip 23 is die-bonded to the element substrate 22, and the other positive electrode element substrate 21 is wire-bonded to the LED chip 23 by a gold wire (or aluminum wire) 25.

  In the present invention, the element substrate to which the LED chip 23 is die-bonded, in this embodiment, the negative element substrate 22 side, has a sufficient cross-sectional area to conduct heat generated in the LED chip 23. For example, appropriate means such as increasing the plate thickness or increasing the shape are provided.

  Further, the terminal portions 21a and 22a for supplying power from the outside of the element substrates 21 and 22 are processed so as to have a substantially cylindrical shape by combining both, and the contact area with the conductive portion 3 described later increases. It is illustrated. At this time, the surface area of the terminal portion 22a of the negative electrode element substrate 22 to which the LED chip 23 is die-bonded is set to be larger than that of the other terminal portion 21a, for example, a semi-cylindrical shape. Is preferred.

  The element substrates 21 and 22 assembled as described above, the LED chip 23, and the gold wire 25 are molded with a transparent epoxy resin to form a resin case 24, and the light source unit 2 of the present invention. It is said that. At this time, the resin case 24 has a shape suitable for converging and emitting light appropriately, such as a convex lens, on the light emitting direction side of the LED chip 23, as in the conventional LED lamp. It is.

  In addition, in the present invention, the resin case 24 is also extended in the direction of the terminal portions 21a and 22a of the element substrates 21 and 22 so as to fill the cylindrical hollow portion formed by the two terminal portions 21a and 22a. It is assumed that sufficient strength can be obtained even when used as a socket, such as by detaching the light source unit 2 and attaching / detaching the light source unit 2 with this part.

  FIG. 3 shows the configuration of the conductive portion 3 constituting the wiring system 1 according to the present invention. The conductive portion 3 keeps the light source portion 2 described above in place and supplies power to turn it on. In addition, it has a function of cooling the heat generation of the light source unit 2 caused by lighting.

  Accordingly, a metal member such as copper, brass, or iron that is excellent in conductivity, thermal conductivity, and workability is adopted as a member for forming the conductive portion 3, and the positive electrode conductive portion 31 and the negative electrode conductive portion 32 are used. The positive electrode conductive portion 31 is provided with a contact piece portion 31a for contacting the terminal portion 21a provided on the positive electrode element substrate 21 of the light source unit 2.

  Similarly, the negative electrode conductive portion 32 is provided with a contact piece portion 32a for contacting the terminal portion 22a provided on the negative electrode element substrate 22 of the light source unit 2. The contact piece portions 31a and 32a have sizes and shapes corresponding to the terminal portions 21a and 22a on the other side to be contacted.

  That is, as described above, in the terminal portions 21a and 22a of the light source unit 2, the terminal portion provided on the element substrate on the side where the LED chip 23 is mounted has a large circumferential angle in the cylindrical shape. Therefore, the contact piece portion that contacts it is naturally set to have a large circumferential angle. In this embodiment, the circumferential angle is 31a <32a.

  Further, when the conductive portion 3 is formed, the thickness of the light source portion 2 is determined in consideration of the amount of heat generated when the light source portion 2 is turned on, and the element substrate on the side where the LED chip 23 is mounted ( For example, the cross-sectional area necessary and sufficient to conduct the amount of heat stored in the negative electrode element substrate 22) to a wide range of the conductive portion 32 by the contacting piece portion (for example, the contacting piece portion 32a) is obtained. .

  In actual implementation, a plurality of, for example, three light source units 2 (LED lamps) may be connected in series to the power source of the vehicle, so that the positive electrode conductive unit 31 and the negative electrode conductive unit 32 In the portion where the light source portions 2 are connected to each other, a shape in which the negative electrode conductive portion 32 and the positive electrode conductive portion 31 are combined may be formed and used (see FIG. 1).

  Further, when the conductive portion 3 is attached to the lamp base 11, it is good as a screw stopper or the like. However, a mounting hole 32b is provided on the conductive portion 3 side, and is formed of a thermoplastic resin. A boss 11a may be provided on the lamp body base 11 at a position corresponding to the mounting hole 32b, and the boss 11a may be fixed with heat caulking in a state where the mounting hole 32b is fitted.

  Here, when the vehicular lamp 10 is a stop / tail combined lamp, two types of lighting states of light and dark must be realized. However, when the light source is an LED lamp (light source unit 2), the power supply to be applied In general, the current value is changed by a chopper means or the like, so that the lighting luminance is bright or dark.

  Therefore, in the present invention, the same means is used, and as shown in FIG. 4, for example, a power feeding unit 4 including a chopper circuit is connected to the previous stage of the conductive unit 3. When there is an input at the T (tail) terminal, the light source unit 2 is lit at a predetermined luminance on the low luminance side, and when there is an input at the S (stop) terminal, the light source unit 2 is lit at a predetermined luminance on the high luminance side. It is assumed that control is made to turn off when there is no input.

  FIG. 4 shows another embodiment of the present invention. In the previous embodiment shown in FIG. 1, the light source unit 2 and the conductive unit 3 are both lamps in order to clearly show the configuration of the present invention. The description has been made assuming that the base 11 is provided on the same side. However, the present invention is not limited to this. In this embodiment, the conductive portion 3 is attached to the lamp base 11 from the back side, and the light source portion 2 is attached to the lamp base 11 from the front side. Yes.

  By doing in this way, the conductive part 3 and the power feeding part 4 that are components for wiring do not pass through a lens (not shown) and the like and do not touch the user's eyes. And so on. At the same time, if the reflecting surface 12 is formed on the front side of the lamp base 11 and the light distribution characteristics are adjusted, the performance can be improved.

It is explanatory drawing which shows embodiment of the wiring system of the vehicle lamp which concerns on this invention. It is explanatory drawing which similarly shows embodiment in the light source part of the wiring system of the vehicle lamp which concerns on this invention. It is explanatory drawing which shows embodiment in the electroconductive part and electric power feeding part of the wiring system of the vehicular lamp which concerns on this invention similarly. It is explanatory drawing which similarly shows another embodiment of the wiring system of the vehicle lamp which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp wiring system 2 ... Light source part 21 ... Positive electrode element board 22 ... Negative electrode element board 21a, 22a ... Terminal part 23 ... LED chip 24 ... Resin case 25 ... Gold wire 3 …… Conducting part 31 …… Conducting part for positive electrode 32 …… Conducting part for negative electrode 31a, 32a …… Contact piece part 31b, 32b …… Mounting hole 4 …… Power feeding part 10 …… Vehicle lamp 11 …… Lamp Base 11a …… Boss 12 …… Reflective surface

Claims (3)

A wiring system for constructing a lighting circuit on a lamp body base. This wiring system is formed on a device substrate, a part of which is formed of a metal member in a substantially cylindrical shape, and a side surface of which can be used as an electrode. A light source part in which an LED chip is mounted to form an LED lamp, and a metal plate material in which a lighting circuit is configured with appropriate fastening means on the lamp base and has an appropriate plate thickness for electrical conductivity and thermal conductivity The light source part and the conductive part are held in contact with the outer diameter of the element substrate of the light source part by holding the light source part in a predetermined position. And a lamp wiring system characterized by being configured to perform power feeding and heat dissipation. A portion of the conductive portion led out of the lamp base is provided with a power supply portion, and the power supply portion is provided with a circuit board on which a control circuit corresponding to the light source portion is mounted. The lamp wiring system according to claim 1. A vehicular lamp comprising the wiring system according to claim 1.

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