JP2001126510A - Vehicle lamp - Google Patents

Abstract

(57) [Problem] To provide a vehicle lamp that is inexpensive, has excellent versatility, can reduce power consumption, and can improve operation reliability. SOLUTION: A light emitting part 4 in which a plurality of light emitting diode elements 3 are arranged as a light source on a substrate 7 formed in a substantially semi-cylindrical shape, and the light emitting part 4 is conductively supported and is detachably mounted on a socket 2. The LED lamp 1 is provided with the base 5 which is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp having a plurality of light emitting diode elements as light sources.

[0002]

2. Description of the Related Art Heretofore, as a lighting lamp, there is a lamp using a plurality of light emitting diode elements as a light source for the purpose of lowering power and extending life. For example, JP-A-11
Japanese Unexamined Patent Publication (Kokai) No. 273423 discloses a light emitting portion in which a large number of light emitting diode (LED) elements as light sources are arranged on a base (substrate) formed in a flat or hemispherical shape, and a socket directly connected to a power supply. A casing in which the light-emitting unit is housed and has a base formed so as to be electrically connected to the housing,
(Hereinafter referred to as LED lamp).

[0003] Meanwhile, in vehicles such as electric vehicles, it is desired to reduce battery power consumption by on-vehicle auxiliary devices and the like in order to secure a cruising distance. Further, it is desired that a general vehicle using an engine as a power source also reduces battery power consumption to reduce the load on the engine by the alternator, thereby improving fuel efficiency. In response to this, the light source of vehicle lamps such as tail lamps, stop lamps, and room lamps is replaced with a lamp having a conventional filament (hereinafter, referred to as a filament lamp).
The above LED lamp can be used.

[0004]

However, in general, the filament of a filament lamp is formed in an elongated coil shape, and the light distribution characteristics of light emitted from such a filament lamp are biased. The vehicle lamp is provided with measures such as setting the shape of the reflecting mirror in accordance with the light distribution characteristics of the filament lamp and providing a reflex reflector on the outer lens. For this reason, when an LED lamp in which a plurality of LED elements are arranged on a flat or hemispherical substrate instead of a filament lamp is directly applied to a vehicle lamp, illumination light having appropriate light distribution characteristics can be obtained. Is difficult. On the other hand, LED
Replacing the reflecting mirror and the outer lens according to the light distribution characteristics of the lamp causes an increase in cost and the like.

In view of the above circumstances, an object of the present invention is to provide a vehicular lamp that is inexpensive, has excellent versatility, and can improve the light distribution characteristics of a vehicular lamp.

[0006]

According to one aspect of the present invention, there is provided a vehicular lamp according to the present invention, comprising: a light emitting portion having a plurality of light emitting diode elements disposed on a substrate as a light source; A base for supporting the light emitting portion and detachably attached to a socket, the light emitting portion emitting light from the light emitting portion by forming the substrate in a substantially semi-cylindrical shape. It is characterized in that the characteristics are radial.

According to a second aspect of the present invention, in the vehicle lamp according to the first aspect, the base is provided with mounting position defining means for defining a mounting position to the socket. And

According to a third aspect of the present invention, there is provided a vehicle lamp according to the first or second aspect, wherein the base is provided on the base and connected to the light emitting portion. A plurality of either one of the negative electrode terminals is provided, and the plurality of the positive electrode terminals or the plurality of the negative electrode terminals are connected to the light emitting unit via resistors having different resistance values.

According to a fourth aspect of the present invention, there is provided a vehicle lamp according to the first or second aspect, wherein the base is disposed on the base and connected to the light emitting portion. A negative terminal, and a signal terminal capable of inputting a luminance switching signal. The resistance value of either the positive terminal or the negative terminal is switched according to a luminance switching signal input from the signal terminal. It is characterized in that it is connected to the light emitting unit via a resistance switching circuit.

According to a fifth aspect of the present invention, there is provided a vehicle lamp according to the first or second aspect, wherein the base is provided on the base and connected to the light emitting portion. A negative terminal and a signal terminal capable of inputting a luminance switching duty signal. One of the positive terminal and the negative terminal is turned ON / OFF according to the luminance switching duty signal input from the signal terminal. O
It is characterized in that it is connected to the light emitting unit via a switch element that is switched by FF.

According to a sixth aspect of the present invention, there is provided a vehicle lamp according to the first or second aspect, wherein the base is provided on the base and connected to the light emitting unit. A plurality of any one of the negative electrode terminals is provided, and the plurality of the positive electrode terminals or the plurality of the negative electrode terminals are provided on the plurality of light emitting units formed by dividing the plurality of light emitting diodes disposed on the substrate into a plurality of systems. Are connected independently.

According to a seventh aspect of the present invention, there is provided a vehicle lamp according to the first or second aspect, wherein the base is provided on the base and connected to the light emitting portion. And a signal terminal capable of inputting a luminance switching signal, and one of the positive electrode terminal and the negative electrode terminal is divided into a plurality of light emitting diodes provided on the substrate and divided into a plurality of systems. The plurality of light emitting units formed as described above are connected to the light emitting unit via a light emitting unit switching circuit that selectively emits light in accordance with the luminance switching signal input from the signal terminal.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 relate to a first embodiment of the present invention, FIG. 1 is an exploded perspective view of an LED lamp and a socket, FIG. 2 is a cross-sectional view of a vehicle lamp, and FIG.
FIG. 3 is a circuit configuration diagram of a lamp.

In this embodiment, for example, a light emitting diode which can be applied as a substitute for the double filament lamp to a vehicle lamp in which a tail lamp and a stop lamp are integrally formed using a double filament lamp. 1 shows an example of a vehicle lamp (hereinafter, referred to as an LED lamp) used.

Therefore, prior to the description of this embodiment, a conventional vehicle lamp in which a tail lamp and a stop lamp are integrally formed using a double filament lamp will be briefly described. As shown in FIG. 2B, the vehicular lamp 20 has a housing 21 in which a double filament lamp 24 is mounted at a substantially central portion via a socket 2a.
And an outer lens 22 that covers the opening of the housing 21.

The base 24c of the double filament lamp 24 is provided with a key (not shown),
By providing a key groove (not shown) in a, the mounting position of the double filament lamp 24 with respect to the vehicle lamp 20 is defined. That is, the tail lamp filament 24a and the stop lamp filament 24b which are the issuing portions of the double filament lamp 24
The mounting position (mounting direction) is defined by the key and the key groove.

A reflection mirror 25 is formed on the inner surface of the housing 21 and a reflex reflector 26 is formed on the back surface of the outer lens 22. These are defined by the keys and key grooves. By appropriately setting the light distribution characteristics of the filaments 24a and 24b, the light emitted from the double filament lamp 24 is appropriately corrected, and then the outer lens 22 is adjusted.
Out of the device.

Next, a vehicle lamp according to the present embodiment will be described. In the figure, reference numeral 1 denotes an LED lamp. The LED lamp 1 includes a light emitting section 4 having a plurality of light emitting diode elements (hereinafter, referred to as LED elements) 3 as light sources, a base 5 for conducting and supporting the light emitting section 4, And an outer tube 6 provided at an end of the base 5 and covering the light emitting unit 4.

The light emitting section 4 includes a substrate 7 which is formed in a substantially semi-cylindrical shape, and the LED element 3 is disposed on the substrate 7 to constitute a main part. Here, each LED element 3
Are connected in series / parallel by a wiring pattern (not shown) provided on the substrate 7 (see FIG. 3).

From the upper end of the base 5, positive and negative power supply lines 9, 10 extend. These feeder lines 9 and 10
Are connected to the substrate 7 so that each LED element 3
And electrically supports the light emitting unit 4.

Here, the width of the substrate 7 (light emitting portion 4) is
It is desirable that the width of the filaments 24a and 24b of the double filament lamp 24 applicable to the vehicle lighting device 20 be set to be substantially the same. Further, the light emitting unit 4 is connected to the base 5.
From the base 24c of the double filament lamp 24 applicable to the vehicle lamp 20 to the filament 24.
It is desirable that the heights are set substantially the same as the heights a and 24b.

That is, the substrate 7 formed in a substantially semi-cylindrical shape
By arranging the LED element 3 on the substrate and setting the width of the substrate 7 and the height from the base 5 to the light emitting portion 4 to a predetermined value, the LED lamp 1 is a filament lamp applicable to the vehicular lamp 20. It emits light radially with the same light distribution characteristics as 24. Specifically, similarly to the double filament lamp 24, the light emitting unit 4 emits light not only in the front but also in the sides and the back.

Within the base 5, resistors 11 a and 11 b having different resistance values R 1 and R 2 are respectively connected in series to the power supply line 9, and these resistors 11 a and 11 b
Is a positive electrode terminal 12 protruding from the bottom surface of the base 5.
a, 12b.

The side surface of the base 5 is formed as a negative electrode terminal 13, and the power supply line 10 is connected to the negative electrode terminal 13.

Here, the resistance value R1 is set to a resistance value that allows the light emitting portion 4 to emit light with a specified luminance as a light source for a tail lamp when a predetermined voltage is applied to the positive terminal 12a and the negative terminal 13. In addition, the resistance value R2 is set to a resistance value that allows the light emitting unit 4 to emit light with a specified luminance as a light source for a stop lamp when a predetermined voltage is applied to the positive terminal 12b and the negative terminal 13. .

On the side surface of the base 5, keys 14a and 14b are provided as mounting position defining means for specifying a mounting position when the base 5 is mounted on the socket 2 (described later).

The socket 2 has the same configuration as the socket 2a applied to the double filament lamp 24, and the double filament lamp 24 of the same standard as the LED lamp 1 is also detachable. .

That is, the socket 2 is provided with a base hole 15 in which the base 5 is detachably mounted, and a bottom of the base hole 15 has a contact 16 which can be freely connected to and separated from the positive electrode terminals 12a and 12b.
a and 16b are provided.

A contact 17 is provided on the inner periphery of the side of the base hole 15 so as to be detachable from the negative electrode terminal 13, and key grooves 18a, 18 corresponding to the keys 14a, 14b are provided.
b is provided.

Further, a flange 19 is provided on the outer periphery of the socket 2 for defining a mounting position when the socket 2 is mounted on a vehicular lamp.

Next, an example in which the LED lamp 1 is applied as a substitute for the double filament lamp 24 to the vehicular lamp 20 in which a tail lamp and a stop lamp are integrally formed will be described.

As shown in FIG. 2A, the LED lamp 1
Is connected to the housing 21 of the socket 2 by the flange 19.
The mounting position of the LED lamp 1 with respect to the socket 2 is defined by the keys 14a and 14b and the key grooves 18a and 18b. 20.

More specifically, the light emitting portion 4 has a longitudinal direction inside the vehicular lamp 20 where the filaments 24a, 24a when the double filament lamp 24 is mounted.
It is arranged in the same direction as the longitudinal direction of b, and the height position is the same as the filaments 24a and 24b.

Then, the terminals 12 a,
When a voltage for a tail lamp is applied to the LED 13, the LED lamp 1 emits light with a predetermined light amount as a light source for the tail lamp. At this time, the LED lamp 1 is
Since the light emitted from the LED lamp 1 is appropriately corrected by the reflecting mirror 25 and the reflex reflector 26, the light emitted from the LED lamp 1 is emitted to the outside of the outer lens. Is emitted.

Similarly, terminals 12 b,
When the voltage for the stop lamp is applied to 13, LED
The lamp 1 emits light with a prescribed light amount as a light source for a stop lamp. At this time, the LED lamp 1 is
0 emits light with the same light distribution characteristics as when the double filament lamp 24 is mounted, the light emitted from the LED lamp 1 is reflected by the reflecting mirror 25 and the reflex reflector 26.
After being appropriately corrected by the above, the light is emitted to the outside of the outer lens.

According to such an embodiment, the LED element 3 is disposed on the substrate 7 formed in a substantially semi-cylindrical shape.
Of the vehicle lamp 20 and the height from the base 5 to the light emitting section 4 are set to predetermined values.
The light can be emitted radially with the same light distribution characteristics as the filament lamp 24 applicable to the present invention.

Therefore, the LED lamp 1 can be applied to a vehicular lamp designed according to the light distribution characteristics of the filament lamp, and the versatility can be enhanced. In other words, this LED lamp 1
Since the light is emitted not only in the front but also in the side and the rear with the same light distribution characteristics as the filament lamp, when the LED lamp 1 is applied to the vehicle lamp instead of the filament lamp, it is adjusted to the characteristics of the LED lamp. The illumination light emitted from the outer lens can be made appropriate without replacing the reflecting mirror and the outer lens, and the cost increase by using the LED lamp 1 instead of the filament lamp can be reduced. .

At this time, the position of the light emitting portion 4 in the vehicle lamp is adjusted to an appropriate position by the keys 14a and 14b and the key grooves 18a and 18b, similarly to the position of the filament when the filament lamp is applied. Can be specified.

Further, two positive terminals 12a, 1
2b, and these positive electrode terminals 12a, 12b are connected to the light emitting section 4 via resistors 11a, 11b having different resistance values, so that the LED lamp 1 is directly applied to a socket for a double filament lamp. In addition, it is possible to emit light of two different levels of luminance with a simple configuration. Therefore, the LED lamp 1 can be more versatile.

Further, since the LED lamp 1 can obtain a desired amount of light with a small amount of power consumption, the power consumption of the vehicle lamp can be reduced, and the fuel efficiency and the cruising distance of the vehicle can be improved. be able to.

Since the LED element 3 generally has a longer life than a filament, the life of the LED lamp 1 can be extended. Therefore, the operation reliability of the vehicle lamp can be improved.

Next, FIG. 4 relates to a second embodiment of the present invention, and FIG. 4 is a circuit configuration diagram of an LED lamp. The LED lamp 1a according to the present embodiment is different from the above-described first embodiment in the circuit configuration for causing the light emitting unit 4 to emit light with different luminance. In addition, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 4, the power supply line 9 is connected to a resistor 11a.
To the positive electrode terminal 12a. Furthermore, a resistor 11c having a resistance value set to R3 and a switch element 30 for switching ON / OFF the conduction of the resistor 11c are connected in parallel to the resistor 11a.

A positive terminal 12b is provided on the bottom of the base 5.
, A signal terminal 31 is provided, and the signal terminal 31 is connected to the switch element 30. And signal terminal 3
The switch element 30 switches ON / OFF the conduction of the resistor 11 in accordance with the luminance switching signal input from the switch 1.

That is, inside the base 5, a resistance switching circuit capable of switching the resistance between the positive terminal 12a and the light emitting section 4 in accordance with the luminance switching signal by the resistors 11a and 11c and the switch element 30. 32 are formed.

Here, the resistance value R1 is determined by the switching element 30
Is turned off, the positive terminal 12a and the negative terminal 1
When a predetermined voltage is applied to the light source 3, the resistance value is set such that the light emitting part 4 can emit light with a specified luminance as a light source for a tail lamp. In addition, the resistance values R1 and R3 are defined as the specified luminance when the light emitting unit 4 is used as a stop lamp light source when a predetermined voltage is applied to the positive terminal 12a and the negative terminal 13 with the switch element 30 turned on. Is set to a resistance value that allows light emission.

According to this embodiment, substantially the same operation and effect as those of the first embodiment can be obtained. Even when the positive electrode terminal 12b is replaced with the signal terminal 31, only by changing the wiring of the socket 2 to the vehicle, the socket 2 can be applied to the vehicular lamp as it is.

Next, FIG. 5 relates to a third embodiment of the present invention, and FIG. 5 is a circuit configuration diagram of an LED lamp. The LED lamp 1b according to the present embodiment is different from the first embodiment in the circuit configuration for causing the light emitting unit 4 to emit light with different luminance. In addition, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 5, the power supply line 9 is connected to the positive electrode terminal 12a via a resistor 11d having a resistance value set to R4 and a switch element 25 for switching ON / OFF the conduction of the resistor 11d. ing.

The bottom surface of the base 5 has a positive terminal 12b.
, A signal terminal 36 is provided, and the signal terminal 36 is connected to the switch element 35. And signal terminal 3
The switch element 35 switches ON / OFF the conduction of the resistor 11d in accordance with the luminance switching duty signal input from the switch 6.

In the above configuration, the luminance of the light emitting section 4 can be adjusted steplessly by turning on / off the switch element 36 according to the luminance switching duty signal input from the signal terminal 36. Therefore, by appropriately setting the luminance switching duty signal, the LED lamp 1b can be used as a tail lamp and a stop lamp.

According to such an embodiment, it is possible to obtain substantially the same operation and effect as those of the above-described first embodiment. Even when the positive electrode terminal 12b is replaced with the signal terminal 36, the socket 2 can be applied to the vehicular lamp as it is simply by changing the wiring of the socket 2 to the vehicle.

Next, FIG. 6 relates to a fourth embodiment of the present invention, and FIG. 6 is a circuit configuration diagram of an LED lamp. The LED lamp 1c according to the present embodiment is such that the light emitting unit 4 is divided into two systems, a first light emitting unit 4a and a second light emitting unit 4b.
The circuit configuration for causing these light emitting units 4a and 4b to emit light is different from that of the first embodiment. In addition, about the structure similar to the above-mentioned 1st Embodiment,
The same reference numerals are given and the description is omitted.

As shown in FIG. 6, the light emitting section 4 includes a plurality of L
A first light emitting unit 4a in which the ED elements 3 are connected in series, and a second light emitting unit 4b in which a plurality of LED elements 3 are connected in series
, And both of these negative electrode sides are connected to a negative electrode terminal 13 via a power supply line 10.

The positive electrode side of the first light emitting section 4a is connected to a positive electrode terminal 12a via a power supply line 9a and a resistor 11e having a resistance value set to R5.
Is a power supply line 9b and a resistor 11 having a resistance value set to R6.
f, and is connected to the positive electrode terminal 12b.

Here, the resistance value R5 is set to a resistance value that allows the light emitting portion 4a to emit light with a specified luminance as a light source for a tail lamp when a predetermined voltage is applied to the positive terminal 12a and the negative terminal 13. Further, the resistance value R6 is set to a resistance value that allows the light emitting unit 4b to emit light at a specified luminance as a light source for a stop lamp when a predetermined voltage is applied to the positive terminal 12b and the negative terminal 13. .

According to this embodiment, it is possible to obtain substantially the same operation and effect as those of the first embodiment.

Next, FIG. 7 relates to a fifth embodiment of the present invention, and FIG. 7 is a circuit configuration diagram of an LED lamp. The LED lamp 1d according to the present embodiment includes the light emitting units 4a and 4b.
Is different from the above-described fourth embodiment in the circuit configuration for emitting light with different luminance. In addition, the same components as those of the above-described fourth embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 7, the positive electrode side of the first light emitting section 4a is connected to a positive electrode terminal 12a via a power supply line 9a and a resistor 11e, and the positive electrode side of the second light emitting section 4b is The power supply line 9b, a resistor 11g having a resistance value set to R7, and a switch element 30 are connected to the positive terminal 12a.

The bottom surface of the base 5 is provided with a positive electrode terminal 12b.
, A signal terminal 31 is provided, and the signal terminal 31 is connected to the switch element 30. And signal terminal 3
The switch element 30 switches ON / OFF the conduction of the resistor 11 in accordance with the luminance switching signal input from the switch 1.

That is, inside the base 5, the first resistors 11 e and 11 g and the switch element 30 provide the first
Light emission of only the first light emitting unit 4a and the second light emitting unit 4a
A light emitting unit switching circuit 33 for selectively switching the light emission of the light emitting unit 4b according to the luminance switching signal is formed.

Here, the resistance value R5 is determined by the switching element 30
Is turned off, the positive terminal 12a and the negative terminal 1
3 is set to a resistance value that allows the first light emitting portion 4a to emit light with a specified luminance as a light source for a tail lamp when a predetermined voltage is applied to the light emitting portion 3. The resistance values R5 and R7 are
With the switch element 30 turned on, the positive electrode terminal 12a
When a predetermined voltage is applied to the negative electrode terminal 13, the resistance value is set so that the total luminance by the first and second light emitting units 4 a and 4 b can be set to a prescribed luminance as a light source for a stop lamp. .

According to such an embodiment, substantially the same operations and effects as those of the above-described first embodiment can be obtained. Even when the positive electrode terminal 12b is replaced with the signal terminal 31, the socket 2 can be applied to a vehicular lamp as it is simply by changing the wiring of the socket 2.

In each of the above embodiments, L
Although an example in which the ED lamp is applied to a vehicle lamp in which a tail lamp and a stop lamp are integrally formed has been described, the present invention is not limited to this, and for example, a tail lamp alone, a stop lamp alone, and a room lamp. The present invention is also applicable to vehicle lighting. In such a case, the brightness of the LED lamp may be set to a single brightness, or may be set to three or more stages, depending on the vehicle lamp to be applied. At this time, the terminals such as the positive terminal, the negative terminal, and the signal terminal, the switch element, the resistance, and the like may be arbitrarily set according to the set luminance number and the like.

[0065]

As described above, according to the present invention, a vehicle lamp is formed by using a plurality of light emitting diode elements, and the light distribution characteristics of the vehicle lamp are the same as those of a lamp using a filament. Because of the light characteristics, it is possible to provide a vehicle lamp that is inexpensive, has excellent versatility, can reduce power consumption, and can improve operation reliability.

[Brief description of the drawings]

FIGS. 1 to 3 relate to a first embodiment of the present invention, and FIG. 1 is an exploded perspective view of an LED lamp and a socket.

FIG. 2 is a sectional view of a vehicular lamp.

FIG. 3 is a circuit configuration diagram of an LED lamp.

FIG. 4 is a circuit configuration diagram of an LED lamp according to a second embodiment of the present invention.

FIG. 5 is a circuit configuration diagram of an LED lamp according to a third embodiment of the present invention.

FIG. 6 is a circuit configuration diagram of an LED lamp according to a fourth embodiment of the present invention.

FIG. 7 is a circuit configuration diagram of an LED lamp according to a fifth embodiment of the present invention.

[Explanation of symbols]

 1, 1a to 1d LED lamp 2 Socket 3 Light emitting diode 4 Light emitting unit 5 Base 7 Board 11a to 11g Resistor 12a, 12b Positive terminal 13 Negative terminal 14a, 14b Key 30, 35 Switch Element 32: Resistance switching circuit 33: Light emitting unit switching circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // F21W 101: 10 F21Q 1/00 L 101: 14 B60Q 1/04 E F21Y 101: 02 F21M 3/02 HF term (reference) 3K013 AA03 BA01 CA05 CA16 3K039 AA01 AA03 CC01 CC09 LB01 LB05 LD06 MA00 3K042 AA08 AA12 AC02 AC06 BA01 BA09 BB01 BC01 CA03 3K080 AA01 AB16 BA04 BA07 BB01 BC01 BE07 CC06 CC17 CC19 CC25

Claims (7)

[Claims] 1. A vehicular lamp comprising: a light-emitting portion having a plurality of light-emitting diode elements disposed on a substrate as a light source; and a base for conductively supporting the light-emitting portion and detachably attached to a socket. A lamp for a vehicle, wherein the substrate is formed in a substantially semi-cylindrical shape, and light distribution characteristics of light emitted from the light emitting portion are radial. 2. The vehicular lamp according to claim 1, wherein said base is provided with mounting position defining means for defining a mounting position to said socket. 3. The base has a plurality of one of a positive terminal and a negative terminal disposed on the base and connected to the light emitting unit, and a plurality of the positive terminals or the negative terminals are respectively connected to different resistances. The vehicular lamp according to claim 1, wherein the vehicular lamp is connected to the light emitting unit via a value resistor. 4. The base has a positive terminal and a negative terminal connected to the base and connected to the light emitting unit, and a signal terminal capable of inputting a luminance switching signal, wherein the positive terminal or the negative electrode is provided. 3. The light emitting unit according to claim 1, wherein one of the terminals is connected to the light emitting unit via a resistance switching circuit that switches a resistance value according to a luminance switching signal input from the signal terminal. Vehicle lamp. 5. The base according to claim 1, wherein the base includes a positive terminal and a negative terminal connected to the light emitting unit, and a signal terminal capable of inputting a luminance switching duty signal. 3. The light emitting unit according to claim 1, wherein one of the negative terminals is connected to the light emitting unit via a switch element that is turned on / off according to the luminance switching duty signal input from the signal terminal. 2. The vehicle lamp according to claim 1. 6. The base comprises a plurality of one of a positive terminal and a negative terminal disposed on the base and connected to the light emitting unit, wherein the plurality of positive terminals or the negative terminals are provided on the substrate. The vehicular lamp according to claim 1, wherein the plurality of light emitting diodes disposed in the plurality of light emitting units are independently connected to the plurality of light emitting units formed by dividing the light emitting diodes into a plurality of systems. 7. The base, the base having a positive terminal and a negative terminal connected to the light emitting unit, and a signal terminal capable of inputting a luminance switching signal, wherein the positive terminal or the negative electrode is provided. Any one of the terminals is selectively divided into a plurality of light emitting units formed by dividing the plurality of light emitting diodes disposed on the substrate into a plurality of systems in accordance with the luminance switching signal input from the signal terminal. The vehicular lamp according to claim 1 or 2, wherein the lamp is connected to the light emitting unit via a light emitting unit switching circuit that causes the light to emit light.