JP6205745B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp provided in an automobile or the like.

  In recent years, an increasing number of vehicular lamps that use a plurality of light emitting elements as a light source, and further, two types of light emitting elements are mounted on one substrate and either type of light emitting element is selectively turned on. By doing so, a vehicular lamp that exhibits two different functions has also been known.

  For example, in Patent Document 1 below, in a vehicular lamp provided at the rear of an automobile, two types of light emitting elements are mounted on one substrate, and when one type of light emitting element is turned on, the function is performed as a marker. It is shown that when a light emitting element of this kind is turned on, it functions as a high-mount stop lamp.

Japanese Patent Laid-Open No. 10-24766

  However, in Patent Document 1, in constructing a vehicular lamp that exhibits two different types of functions, a large number of two types of light emitting elements are mounted on a single substrate, which may cause various problems. is there.

  For example, an increase in the number of light emitting elements not only increases the cost of components, but also makes it difficult to employ an inexpensive lighting circuit, which may increase the cost significantly. In particular, as in the case of the vehicular lamp disclosed in Patent Document 1, there is a problem that the number of light-emitting elements is increased in the case of obtaining line-like light emission, so that the cost is likely to increase.

  In addition, when a large number of light emitting elements are mounted on a substrate, the distance between the light emitting elements is reduced, so that the influence of heat generated from the light emitting elements is increased, and the performance of the light emitting elements is deteriorated or the life of the light emitting elements is reduced. There is a possibility that inconvenience such as shortening may occur.

  The present invention has been made in view of such circumstances, and the object thereof is to mount two types of light emitting elements on one substrate and selectively turn on either type of light emitting elements. An object of the present invention is to provide a vehicular lamp that can reduce the number of light-emitting elements as much as possible while achieving two different functions.

  In order to achieve such an object, (1) a vehicular lamp according to the present invention includes a substrate, a first type of light-emitting element mounted on the substrate, and a second type of light-emitting element mounted on the substrate. A light-emitting element; a lighting circuit that selectively lights the first-type light-emitting element and the second-type light-emitting element; and lighting of the first-type light-emitting element and the second-type light emission A light guide that is also used when the element is turned on, and emits light incident from each of the light emitting elements from a common emission range.

  In the invention of (2), in the above (1), the substrate is formed on a surface on which the light emitting elements are mounted, electrically connects the light emitting elements, and generates heat from the light emitting elements. A plurality of heat dissipating conductor regions that dissipate heat, and a non-conducting region that is formed between each of the heat dissipating conductor regions and electrically connects the adjacent heat dissipating conductor regions, and at least One heat radiating conductor region is shared when the first type of light emitting element is lit and when the second type of light emitting element is lit.

  In the invention of (3), in mounting the two first type light emitting elements and one second type light emitting element on the substrate in the above (2), the substrate has a non-conductive region. A first to a third heat dissipation conductor region arranged in series via a conductor region, and a conductor region that enters the central portion of the second heat dissipation conductor region via the non-conductive region, The first type light emitting element is disposed so as to straddle a non-conduction region between the first heat radiating conductor region and the second heat radiating conductor region, and the other first type light emitting element is The second light-emitting element is disposed across the non-conduction region between the second heat-dissipating conductor region and the third heat-dissipating conductor region. Arranged so as to straddle the non-conduction region between the second heat dissipation conductor region and the conductor region at the center. It is.

  According to the invention of (4), in the above (1) to (3), when the first type light emitting element is lit, it functions as a daytime running lamp, and when the second type light emitting element is lit. Functions as a position lamp.

  According to the vehicular lamp having such a configuration, two types of light emitting elements are mounted on one substrate, and two types of functions are exhibited by selectively lighting one of the types of light emitting elements. However, the number of light emitting elements can be reduced as much as possible, and the cost can be greatly reduced.

It is a figure which shows Embodiment 1 of the vehicle lamp of this invention, (a) is a front view, (b) is a top view. It is a top view which shows the LED board which comprises the vehicle lamp of this invention. It is a top view which shows the lighting circuit board which comprises the vehicle lamp of this invention. It is a figure which shows Embodiment 2 of the vehicle lamp of this invention, (a) is a side view, (b) is a top view.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

(Embodiment 1)
1A and 1B are diagrams showing Embodiment 1 of a vehicular lamp according to the present invention, in which FIG. 1A is a front view and FIG. 1B is a plan view.
A vehicular lamp 10 shown in this figure is a lamp that is provided in the front part of an automobile and is used as both a daytime running lamp that is lit during the daytime and a position lamp that is lit at night (including early morning and evening). The LED board 20, the light emitting elements 30 and 40, the lighting circuit board 50 (see FIG. 3), and the light guide 60 are included.

  On the LED substrate 20, a first type light emitting element (hereinafter referred to as a first light emitting element) 30 and a second type light emitting element (hereinafter referred to as a second light emitting element) 40 are mounted. . In the present embodiment, the first light emitting element 30 is for a daytime running lamp, for example, is configured using a chip-type blue light emitting diode, and the second light emitting element 40 is for a position lamp. For example, it is configured using a chip-type white light emitting diode.

  On the lighting circuit board 50, a daytime running lamp lighting circuit 51 and a position lamp lighting circuit 52 are mounted (see FIG. 3), and either one of the lighting circuits 51, 52 is selectively used. When the daytime running lamp lighting circuit 51 is used, the first light emitting element 30 is turned on to cause the vehicular lamp 10 to function as a daytime running lamp, and when the position lamp lighting circuit 52 is used, the second light emitting element. 40 lights up to make the vehicular lamp 10 function as a position lamp.

  The light guide 60 is used both when the first light emitting element 30 is turned on and when the second light emitting element 40 is turned on, and guides light incident from the light emitting elements 30 and 40 and emits the light from a common emission range. Specifically, the incident part 61 into which the light emission of the light emitting elements 30 and 40 is incident, the light guiding part 62 that guides the incident light, and the guided light are emitted. And a light emitting portion 63 to be integrated.

  The light guide body 60 of the present embodiment is a flat light guide member having a curved portion, and one end surface thereof is an incident portion 61. The incident part 61 is disposed so as to face the light emitting elements 30 and 40 mounted on the LED substrate 20 in a proximity state, and causes the light emitted from the light emitting elements 30 and 40 to enter the light guide 60.

  The emitting part 63 is formed on the end face adjacent to the incident part 61 in the flat light guide member, and emits light incident from the light emitting elements 30 and 40 from a common emitting range. In order to adjust the direction of the emitted light, the emission part 63 of the present embodiment has the irregularities 63a having a predetermined shape on the emission surface, but the presence or absence thereof is arbitrary.

  The light guide unit 62 guides the light incident from the incident unit 61 to the emission unit 63 while reflecting the light inside the light guide member. The light guide unit 62 of the present embodiment has irregularities 62a having a predetermined shape on the main reflection surface in order to efficiently reflect incident light, but the presence or absence thereof is arbitrary.

  According to the vehicular lamp 10 configured as described above, two types of light-emitting elements 30 and 40 are mounted on one LED substrate 20, and either type of light-emitting elements 30 and 40 is selectively lit. Therefore, while exhibiting two different functions, the number of the light emitting elements 30 and 40 can be reduced as much as possible, and the cost can be greatly reduced.

  That is, the vehicular lamp 10 according to the embodiment of the present invention guides the light emitted from the light emitting elements 30 and 40 by the light guide 60 and emits the light from the emitting portion 63 of the light guide 60. Even in the case of 30, 40, a desired light emission form can be obtained by setting the shape of the light guide 60. As a result, not only the number of the light emitting elements 30, 40 can be reduced, but also an inexpensive lighting circuit can be adopted. Therefore, significant cost reduction can be achieved.

  In addition, the light guide 60 is used both when the first light emitting element 30 is turned on and when the second light emitting element 40 is turned on, and guides the light incident from each of the light emitting elements 30, 40, and has a common emission range. Therefore, the number of components can be reduced and the cost can be reduced as compared with the case where a separate light guide 60 is provided for each type of the light emitting elements 30 and 40, and the size of the vehicular lamp 10 can be avoided. be able to.

  Further, in the LED substrate 20, by reducing the number of the light emitting elements 30, 40, the distance between the light emitting elements 30, 40 is ensured to be large, and the heat radiating conductor region is widened. It is possible to eliminate the influence of heat as much as possible, and to prevent the performance of the light emitting elements 30 and 40 from being reduced and the lifespan thereof being shortened.

  Next, a specific configuration of the LED substrate 20 according to the embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a plan view showing an LED substrate constituting the vehicular lamp of the present invention.
As shown in this figure, the LED substrate 20 is formed on the surface on which the light emitting elements 30 and 40 are mounted, and the conductor regions 21 to 24 that electrically connect the light emitting elements 30 and 40 and the conductor regions 21 to 21 are connected. 24 and a non-conductive region 25 that is formed between the adjacent conductive regions 21 to 24 and is electrically nonconductive. Each of the conductor regions 21 to 24 is formed of, for example, a copper foil pattern, and is electrically connected to a connector 26 mounted on one end portion of the LED substrate 20.

  In the conductor regions 21 to 24, not only the light emitting elements 30 and 40 are electrically connected, but also a heat dissipating conductor region formed over a wide area to dissipate heat generated from the light emitting elements 30 and 40. 21 to 23 are included. According to such heat-dissipating conductor regions 21 to 23, heat generated from the light emitting elements 30 and 40 can be dissipated using the conductor regions 21 to 23 such as a copper foil pattern formed on the LED substrate 20. Therefore, there is an advantage that the number of parts can be reduced and the cost can be reduced as compared with the case where a separate heat dissipating means is provided. There is.

  Therefore, in the LED substrate 20 of the present embodiment, at least one heat-dissipating conductor region 22 is shared when the first light emitting element 30 is turned on and when the second light emitting element 40 is turned on. In this way, two types of light emitting elements 30 and 40 are mounted on one LED substrate 20, and two types of light emitting elements 30 and 40 are selectively turned on to exhibit two different functions. However, it is possible to perform heat dissipation of the light emitting elements 30 and 40 using the heat dissipation conductor regions 21 to 23 while suppressing the entire area of the heat dissipation conductor regions 21 to 23.

  Hereinafter, a specific configuration of the LED substrate 20 of the present embodiment on which two first light emitting elements 30 and one second light emitting element 40 are mounted will be described.

  As shown in FIG. 2, the LED substrate 20 has a predetermined direction (in this example, the longitudinal direction of the substrate) via the non-conductive region 25 when mounting the two first light emitting elements 30 and the one second light emitting element 40. ) In series, and a conductor region 24 that enters the central portion of the second heat dissipation conductor region 22 through the non-conduction region 25.

  The first heat dissipating conductor region 21 has substantially the same width (area) as the third heat dissipating conductor region 23, and a first terminal (not shown) of the connector 26 is provided via a narrow and long wiring pattern 21a. )).

  The second heat dissipating conductor region 22 has a width (area) approximately twice that of the first heat dissipating conductor region 21 and the third heat dissipating conductor region 23, and is a narrow and long wiring. It is electrically connected to a second terminal (not shown) of the connector 26 through the pattern 22a.

  The third heat dissipating conductor region 23 has substantially the same width (area) as the first heat dissipating conductor region 21, and is connected to a third terminal (not shown) of the connector 26 via a narrow wiring pattern 23a. Electrically connected.

  In FIG. 2, the conductor region 24 extends upward from the center position of the lower side of the second heat radiating conductor region 22 and reaches the center of the second heat radiating conductor region 22. The lower end of the conductor region 24 is electrically connected to a fourth terminal (not shown) of the connector 26 through a narrow and long wiring pattern 24a.

  One of the first light emitting elements 30 is disposed so as to straddle the non-conduction region 25 between the first heat dissipating conductor region 21 and the second heat dissipating conductor region 22, and the other first light emitting element. 30 is arranged so as to straddle the non-conduction region 25 between the second heat radiation conductor region 22 and the third heat radiation conductor region 23, and the second light emitting element 40 is provided with the second heat radiation conductor region 22. Is disposed so as to straddle the non-conduction region 25 between the second heat radiation conductor region 22 and the conductor region 24.

  In the LED substrate 20 configured as described above, when a voltage is applied between the first terminal and the third terminal of the connector 26, the first heat-dissipating conductor region 21, one of the first light-emitting elements 30, the first A current flows in the order of the second heat-dissipating conductor region 22, the other first light-emitting element 30, and the third heat-dissipating conductor region 23 (or the reverse order), and the two first light-emitting elements 30 are lit. At this time, the first to third heat radiating conductor regions 21 to 23 radiate heat generated from the two first light emitting elements 30.

  In addition, when a voltage is applied between the second terminal and the fourth terminal of the connector 26 on the LED board 20, the order of the second heat-dissipating conductor region 22, the second light emitting element 40, and the conductor region 24 (or reverse) Current) flows, and the second light emitting element 40 is turned on. At this time, the second heat radiating conductor region 22 radiates heat generated from the second light emitting element 40.

  Next, a specific configuration of the lighting circuit board 50 according to the embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a plan view showing a lighting circuit board constituting the vehicular lamp of the present invention.
As shown in this figure, the lighting circuit board 50 includes two types of light-emitting elements 30 and 40 mounted on one LED board 20, and when the light-emitting elements 30 and 40 are selectively turned on, A daytime running lamp lighting circuit 51 for lighting one light emitting element 30 and a position lamp lighting circuit 52 for lighting the second light emitting element 40 are separately provided.

  According to such a lighting circuit board 50, two types of light emitting elements 30 and 40 having different current values are selectively lit by the corresponding daytime running lamp lighting circuit 51 and position lamp lighting circuit 52, respectively. Compared with the case where the current value is switched by one lighting circuit, not only can the lighting circuit board 50 be reduced in cost by simplifying the configuration of the lighting circuit, but also the current values of the light emitting elements 30 and 40 can be stabilized to emit light. Changes in chromaticity in the elements 30 and 40 can also be suppressed.

  For example, in the lighting circuit board 50 of the present embodiment, an FET constant current circuit is used as the daytime running lamp lighting circuit 51 having a current value higher than that of the position lamp lighting circuit 52, and this circuit is configured to be switchable. However, in this embodiment, this switching is performed by additionally adding an inexpensive resistor circuit as the position lamp lighting circuit 52. Therefore, in the FET constant current circuit, The cost of the lighting circuit board 50 can be reduced as compared with the case where the current is switched.

  Further, in the lighting circuit board 50 of the present embodiment, when the second light emitting element 40 (white light emitting diode) is turned on by the position lamp lighting circuit 52, the current value can be set by a dedicated resistor circuit. Not only can the chromaticity of the second light-emitting element 40 be prevented from deviating from the white range, but the range of applicable light-emitting elements can be expanded and inexpensive light-emitting elements can be selected.

(Embodiment 2)
Next, a vehicular lamp according to a second embodiment of the present invention will be described with reference to FIG. However, about the structure which is common in the said embodiment, description of the said embodiment is used by using the same code | symbol as the said embodiment.

4A and 4B are views showing Embodiment 2 of the vehicular lamp of the present invention, in which FIG. 4A is a side view and FIG. 4B is a plan view.
As shown in this figure, in the vehicular lamp 10B according to the second embodiment, the shape of the light guide 70 is different from that of the previous embodiment, and accordingly, the arrangement of the light emitting elements 30 and 40 on the LED substrate 20 is adjusted. Has also changed.

  The light guide 70 according to the second embodiment is a round light guide member that is integrated by combining a plurality (three in this example) of round light guide lenses 71 to 73, and one end side thereof is incident portions 71a to 73a. It has become. Each incident part 71a-73a is arrange | positioned so as to oppose each light emitting element 30 and 40 mounted in LED board 20 in the proximity | contact state, and light emission of each light emitting element 30 and 40 is separately round light guide lens 71-71. 73 is incident.

  The other end sides of the round light guide lenses 71 to 73 are integrally connected, and this is an emission part 74. In other words, the round light guide lenses 71 to 73 guide the light incident from the light emitting elements 30 and 40 to the emission unit 74 and emit the light from a common emission range. Even when such a light guide 70 is employed, the same effects as those of the above-described embodiment can be obtained.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  For example, in the above-described embodiment, the vehicular lamp that is used for both the daytime running lamp and the position lamp is illustrated. Needless to say, the present invention is also useful in a vehicular lamp.

DESCRIPTION OF SYMBOLS 10, 10B ... Vehicle lamp, 20 ... LED board, 21-23 ... Heat-dissipation conductor area | region, 24 ... Conductor area | region, 25 ... Non-conduction area | region, 26 ... Connector, 30 ... 1st type light emitting element, 40 ... 1st 2 types of light-emitting elements, 50 ... lighting circuit board, 51 ... daytime running lamp lighting circuit, 52 ... position lamp lighting circuit, 60 ... light guide, 61 ... incident part, 62 ... light guide part, 63 ... emission part , 70 ... Light guide, 71 ... Round light guide lens, 74 ... Output part

Claims (4)

A substrate,
A first type of light emitting element mounted on the substrate;
A second type of light emitting element mounted on the substrate;
A lighting circuit for selectively lighting the light emitting element of the first type and the light emitting element of the second type;
The first-type light-emitting element and the second-type light-emitting element are disposed so as to face each other in close proximity, and light from the first-type light-emitting element and the second-type light-emitting element is incident thereon. A light guide unit that has one end surface that serves as an incident unit and guides the incident light of the first type light emitting element and the second type light emitting element to a common output range of the output unit while internally reflecting the light. A light guide having,
The emission range of the emission part from which light is emitted when the first type of light emitting element is turned on is the same as the emission range of the emission part from which light is emitted when the second type of light emitting element is turned on. A vehicle lamp characterized by the above. The substrate is
A plurality of heat-dissipating conductor regions that are formed on a surface on which the light-emitting elements are mounted, electrically connect the light-emitting elements, and dissipate heat generated from the light-emitting elements;
A non-conductive region that is formed between each of the heat-dissipating conductor regions and electrically connects the adjacent heat-dissipating conductor regions, and
2. The vehicular lamp according to claim 1, wherein at least one of the heat dissipating conductor regions is shared when the first type of light emitting element is turned on and when the second type of light emitting element is turned on. . In mounting the two light emitting elements of the first type and the light emitting element of the second type on the substrate,
The substrate is
First to third heat dissipating conductor regions arranged in series via a non-conducting region;
A conductor region that enters the central portion of the second heat dissipation conductor region through the non-conductive region;
Have
One of the light emitting elements of the first type is disposed so as to straddle a non-conduction region between the first heat radiation conductor region and the second heat radiation conductor region,
The other light emitting element of the first type is disposed so as to straddle a non-conduction region between the second heat dissipation conductor region and the third heat dissipation conductor region,
The second type light emitting element is disposed so as to straddle a non-conduction region between the second heat radiation conductor region and the conductor region at a central portion of the second heat radiation conductor region. The vehicular lamp according to claim 2, wherein the vehicular lamp is provided. When the light emitting element of the first type is lit, it functions as a daytime running lamp,
4. The vehicular lamp according to claim 1, wherein the vehicular lamp functions as a position lamp when the second type of light emitting element is turned on. 5.

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