JPH1024766A - Lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exert multiple functions with one lighting fixture and cause no problem on laws and regulations. SOLUTION: Two kinds of light emission diodes (LED) 5R, 5G different in coloring light respectively are arranged alternately on a printed circuit board 3 as light sources of two lamps in one lighting fixture, and they are interior packaged in a lamp chamber constituted of a lamp body 1 and a lens 2. The luminous intensity of one LED 5R is set higher than that of the other LED 5G. Since both LEDs 5R, 5G are independently illuminated, they can function as lamps respectively. When both lamps are lighted, this lighting fixture functions as the lamp having the luminescent color of one LED 5R due to the difference in the luminous intensity, the lamp of the other LED 5G is also lighted, and no problem on laws and regulations is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp configured to emit light of different colors, and more particularly to a lamp using a light emitting diode (LED) as a light source.

[0002]

2. Description of the Related Art As a recent automotive lamp, a light source is an LE.
The use of lamps using D has increased, and for example, LEDs have been used as a light source such as a marker or a high mount stop lamp (HMSL) provided at the rear of an automobile. On the other hand, from the design requirements of the car,
There is also a demand for configuring a single lamp to perform a plurality of functions. For example, it has been considered that the marker and the HMSL are configured as one integrated lamp.
Multiple LEs as light sources for marker and HMSL
D is integrally provided in one lamp, the marker is turned on when the brake is not applied, and the HMSL is turned on when the brake is applied, so that the lamp has two different functions of the marker and the HMSL.

[0003]

However, in such a conventional lamp, since one of the light sources, the marker and the HMSL, is selectively turned on, the state in which the marker is turned on is considered. When the HMSL is turned on by applying the brake at the time of, the marker is turned off, and there arises a problem that it is not possible to satisfy the legal requirement that the marker be constantly turned on. Therefore, in the conventional lamp in which the marker and the HMSL are integrated, the marker and the HMSL must be lit independently of each other, and as a result, a so-called combination in which the marker and the HMSL are simply mechanically integrated. In fact, it is inevitable that the lamp must be configured as a mold-shaped lamp, and a lamp that fulfills a plurality of functions with one lamp, which is the original purpose, cannot be realized.

[0004] It is an object of the present invention to provide a vehicular lamp that can perform a plurality of functions with a single lamp and that does not cause legal problems.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a vehicular lamp in which a plurality of two types of LEDs, each emitting a different color light, are arranged in one lamp, respectively. A second type of LED is arranged, and each of the first type and the second type of LED is configured to emit light independently. here,
The emission luminance of the first type LED is the second type LED
It is preferable that the light emission luminance is set to be higher than the light emission luminance. For example, the first type of LED is a discrete type LED having a shell type package, and the second type of LED is a chip type LED.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of an embodiment of a lamp (herein, conveniently referred to as a marker stop lamp) in which the present invention is configured with a rear marker of an automobile and an HMSL as one lamp, and FIG. It is a perspective view. As shown in these figures, the marker stop lamp MSL is disposed in a recess RSS provided in a part of the rear spoiler RSP of the automobile CAR, and is formed in a horizontally elongated plate shape. Lamp body 1;
Lens 2 attached to the front opening of this lamp body 1
And a printed circuit board 3 housed in a lamp chamber defined by these components.

One side edge of the lamp body 1 has a pair of L's.
A U-shaped bracket 11 is integrally formed, and the bracket 11 is used to mount the rear spoiler RSP. In addition, the lens 2 is formed in an elongated shape corresponding to the lamp body 1 and formed in a gutter shape having a curved lower surface by integral molding of a colorless transparent acrylic resin. Lance structure engaging piece 2
1 is integrally attached to the lamp body 1 by engaging a notch 12 provided at a corresponding portion of the lamp body 1. A light distribution control lens step 22 for diffusing light from an LED as a light source described later is formed on the front inner surface of the lens 2.

Bosses 13 are provided upright at positions near both ends of the inner surface of the lamp body 1, and elongated printed circuit boards 3 are fixedly supported by tapping screws 4 at these positions near both ends. A large number of LEDs 5 are mounted on the printed circuit board 3, and these LEDs 5 constitute a light source of a marker stop lamp MSL. Also, a plurality of cords 6 electrically connected to the LED 5 are connected to the printed circuit board 3, and the cords 6 are marked through cord insertion holes 14 opened at a substantially central position of the lamp body 1. The stop lamp MSL is pulled out to the outside, and a connector connected to a power supply connector on the vehicle-mounted battery side (not shown) is connected to the end of the stop lamp MSL. Further, the cord is covered with a rubber bushing 7 to waterproof the cord insertion hole 14.

3 (a) and 3 (b) show a front view in which a part of the marker stop lamp is cut away and an enlarged sectional view taken along the line AA of FIG.
It is composed of various types of LEDs. First type LED5R
Is a discrete LED having a shell-shaped package, and two leads protruding from the package are mounted on the front surface of the printed circuit board 3 by soldering. This first type LED5
R is configured as a light source of a stop lamp, is configured by an LED that emits red light, and is arranged in series at a required pitch dimension along the length direction of the printed circuit board 3. The second type LED 5G is an LED having a bare chip configuration, and is surface-mounted on the printed circuit board 3. The second type LED 5G is configured as a light source of a marker, and configured as an LED that emits light of a color other than red, here green light.
They are arranged in series between the arrangement pitches of R.

FIG. 4 shows each of the first and second types of LEs.
D5 (5R, 5G) (hereinafter referred to as red LE based on emission color)
D5R, green LED 5G). The LEDs 5R and 5G of each color are respectively divided into a plurality of groups, and within each group, the LEDs are connected in series. In each group, the cathode side is commonly connected, and is connected to GND via a backflow prevention diode D. In each group of the red LEDs 5R as the light source of the stop lamp, the anode side is commonly connected via a current limiting resistor R1, and the common connection line L1 is provided.
Is connected to the vehicle body battery VDD via the stop lamp switch SSW. Further, each group of green LEDs 5G as a marker light source is provided with a current limiting resistor R.
2, and is connected to the vehicle body battery VDD via the automatic lighting circuit 10 and the ignition switch ISW by the common connection line L2.

The automatic lighting circuit 10 is a circuit for automatically lighting a marker when the car travels in a dark place. Here, a light detection circuit for detecting the brightness around the car and outputting a signal. An element 101; an amplifier circuit 102 for amplifying the detection output thereof; a Schmitt circuit 103 for providing the amplified output with hysteresis; and a timer circuit 10 for maintaining the output of the Schmitt circuit 103 for a predetermined time.
4 and a transistor switch circuit 105 that turns on the common connection line when the output of the timer circuit 104 is equal to or higher than a predetermined level.

According to this configuration, in the automatic lighting circuit 10, the output voltage of the light detecting element 101 is reduced when the surroundings of the vehicle become dark. The amplifier circuit 102 inverts and amplifies the output voltage. In the Schmitt circuit 103, hysteresis is given to the inverted and amplified output voltage.
The lighting and the turning off are not repeated frequently before and after the on / off threshold value. Further, the timer circuit 104 holds the output voltage for a certain period of time, so that lighting and extinguishing due to the output voltage fluctuating due to, for example, illumination of a city area are not frequently repeated. When the output voltage of the timer circuit 104 exceeds the input threshold voltage of the transistor switch circuit 105, the common connection line L2 is turned on, and the green L
The ED 5G is connected to the vehicle battery VDD, and emits green light. Since this green light is transmitted through the lens 2 and radiated to the outside, it functions as a green marker. on the other hand,
When the braking operation is performed, the common connection line L1 is turned on by the stop lamp switch SSW, so that the red LED 5R is connected to the vehicle-mounted battery VDD and emits red light. Since this red light is transmitted through the lens 2 and radiated to the outside, it functions as a stop lamp.

In this marker / stop lamp, even when the red LED 5R is illuminated and the stop lamp is illuminated when the green LED 5G is illuminated, that is, when the marker is illuminated, the marker is illuminated. It has been kept in a state. Therefore, there is no legal problem. When the stop lamp is lit, the marker is also lit, so that the red light of the red LED 5R and the green light of the green LED 5G are emitted from the lens in a mixed state. At this time, the red light and the green light are mixed to form white light. The red LED has a discrete configuration, and the emission luminance is higher than the emission luminance of the green LED having the bare chip configuration, and is located closer to the lens. Since the lamp is arranged so as to cover the front of the green LED, the entire lamp emits red light regardless of the color mixture. Therefore, although the saturation of the red light is somewhat reduced, there is no problem in emitting the red light as a stop lamp.

In this marker stop lamp,
As can be seen from FIG. 3A, since the green LEDs 5G are arranged between the pitches of the red LEDs 5R, the arrangement pitch of the LEDs of each color is made equal. Therefore, each color LE
The intervals between the light emitting points when D is lit are equal, and the light distribution in the arrangement direction can be made uniform. On the other hand, as can be seen from FIG.
The red LED 5R is arranged at a position slightly separated from the surface of the printed circuit board 3, and the green LED 5G is mounted in a state of being closely attached to the surface of the printed circuit board 3, so that both LEDs 5R and 5G are connected to the optical axis of the lens 2. The red LED 5 </ b> R is located closer to the lens 2 while being positioned above.
Therefore, the red LED is positioned with respect to the focal position of the diffusion light distribution control lens step 22 provided on the lens 2.
Since the position of 5R is near the focus and the position of the green LED 5G is far from the focus, the degree of diffusion of the red light is higher than that of the green light, and the visible range of the stop lamp can be made larger than the marker.

The red LED 5R and the green LED 5G
Can be electrically connected as shown in FIG. That is, one group of the red LED 5R and the green LED
The cathodes of one group of 5G are commonly connected, and these are connected to GND via a current limiting resistor R3. The other groups of LEDs are similarly connected. And although illustration is omitted, like the case of FIG.
5R connects the anodes of each group to the vehicle-mounted battery via a stop lamp switch via a common connection line L1. The green LED 5G connects the anode of each group to the vehicle-mounted battery via an automatic lighting circuit via a common connection line L2. In addition, without connecting the automatic lighting circuit,
It may be connected in parallel with a tail lamp (not shown).

According to this electrical connection, the current limiting resistor R3 connected to GND limits the current flowing through itself to a constant current, so that only the red LED 5R is turned on, When both the LED 5G and the LED 5G are turned on, there is a slight difference in the current flowing through each LED. Therefore, the emission luminance when only the red LED 5R is turned on is slightly higher than the emission luminance when both the red LED 5R and the green LED 5G are turned on. Therefore, since the marker is not lit during the daytime, the luminance of the red light when the stop lamp is lit is higher than the luminance of the red light when the stop lamp is lit when the marker is lit at night. As a result, the visibility of the stop lamp during the daytime can be increased.

Here, in the above embodiment, an example is shown in which the present invention is applied to a lamp in which a marker that emits green light and a stop lamp (HMSL) that emits red light are integrated. By changing the luminescent color, it becomes possible to integrate various kinds of lamps equipped in the automobile with different functions. In the above embodiment, the light source L
Although the example in which the EDs are arranged in one straight line is shown, the EDs may be arranged in a matrix shape. Also in this case, it is important to arrange the second type of LED between the first type of LED.

[0018]

As described above, according to the present invention, a plurality of second type LEDs of different colors are arranged between a plurality of first type LEDs arranged in one lamp. And the first and second types of LEDs are configured to emit light independently of each other.
Each type of LED is individually lit to light each color,
Alternatively, it is possible to make both LEDs emit light at the same time to perform lighting of one color. As a result, the lamps having different functions can be integrated as one lamp without causing any legal problem, thereby reducing the space for arranging the lamps in the vehicle, increasing the degree of freedom in designing the vehicle, and improving the design. Can meet the requirements of For example, by making the light emission luminance of the first type LED larger than the light emission luminance of the second type LED, when both LEDs are turned on at the same time, the color light emitted by the first type LED is Lighting can be performed.

[Brief description of the drawings]

FIG. 1 is an external view of an embodiment in which the present invention is applied to a marker stop lamp.

FIG. 2 is a partially exploded perspective view of a main part of FIG.

FIG. 3 is a front view in which a part of the marker stop lamp is cut away and an enlarged cross-sectional view taken along the line AA.

FIG. 4 is a circuit diagram showing the electrical connection of each color LED.

FIG. 5 is a circuit diagram showing another example of the electrical connection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp body 2 Lens 3 Printed circuit board 5 LED 5R Red LED 5G Green LED 10 Automatic lighting circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukihisa Matsunaga 500 Kitawaki, Shimizu City, Shizuoka Prefecture Koito Manufacturing Co., Ltd.

Claims (4)

[Claims] 1. A vehicular lamp in which a plurality of two types of light emitting diodes, each emitting a different color light, are arranged in one lamp, respectively, wherein a second type of light emitting diode is interposed between the first type of light emitting diodes. A vehicular lamp, wherein a light emitting diode is arranged, and the first type and the second type of light emitting diode are configured to emit light independently of each other. 2. The vehicular lamp according to claim 1, wherein the light emission luminance of the first kind of light emitting diode is higher than the light emission luminance of the second kind of light emitting diode. 3. The vehicular lamp according to claim 1, wherein the first type of light emitting diode is a discrete type light emitting diode having a shell type package, and the second type of light emitting diode is a chip type light emitting diode. 4. The vehicular lamp according to claim 1, wherein the first kind of light emitting diode emits red light, and the second kind of light emitting diode emits color light other than red light.