JPH0522188U - Automotive signal indicator light - Google Patents

Abstract

(57) [Abstract] [Purpose] A conventional automobile signal indicator light that uses a light bulb as a light source and diffuses light by forming prismatic irregularities on the inner surface of a colored protective cover If the shape was curved, it became difficult to manufacture and the performance was poor. [Structure] A micro-prism sheet 4 having a large number of precision micro-prism surfaces formed on one surface is arranged so that the micro-prism surface faces the back surface of the protective cover 3, and the light of the light-emitting diode 2 serving as a light source is diffused. . When the light emission color of the light emitting diode 2 and the light color according to the safety regulations are different, a light transmissive colored plate is arranged in front of the micro prism sheet 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automobile signal indicator light whose light color is defined by safety regulations.

[0002]

[Prior Art]

 The light colors of vehicle signal lights such as tail lights, stop lights, turn signals, parking lights and side lights are defined as red, red or amber, yellow or amber according to security regulations. Since the light source of the conventional automobile signal indicator lamp used a light bulb, the protective cover of the automobile signal indicator lamp is colored so that the transmitted light exhibits a predetermined light color, and the inner surface of the protective cover is colored. Light was diffused by forming prismatic irregularities on the.

[0003]

[Problems to be solved by the device]

 Recently, the body shape of automobiles tends to be streamlined with less air resistance, and along with this, it is often desirable to make the shape of the signal lights for automobiles a curved shape that fits the curved portion of the body. It's coming. If the protective cover has a curved surface, it becomes very difficult to design the prismatic irregularities formed on the back surface of the protective cover and to make a molding die for it, which not only increases the mold cost but also affects the prism configuration angle. Therefore, very good optical characteristics could not be obtained.

Further, since a light bulb is used as a light source, the signal indicator light has a large thickness, which is very difficult when forming a body part to which the signal indicator light is attached by deep drawing. ..

[0005]

[Means for Solving the Problems]

 The signal indicator lamp for automobiles of the present invention, which has been made for the purpose of solving the above-mentioned problems, has a base with a light emitting diode as a light source and a protective cover made of a plastic material having a good flatness on the back. Between the light emitting diode and the protective cover, a plastic microprism sheet with a large number of precision microprism surfaces formed on one side is placed so that the microprism surface faces the back surface of the protective cover. is there.

The above-mentioned micro prism sheet may be colored. Further, not only the micro prism sheet may be provided between the light emitting diode and the protective cover, but a light transmitting colored plate may be provided in front of the micro prism sheet.

[0007]

[Work]

 If the color of the light emitted from the light emitting diode satisfies the safety regulations, the light emitted from the light emitting diode is diffused by the micro prism of the micro prism sheet even if the back of the protective cover is flat and the protective cover is not colored. As a result, a desired light color can be obtained.

When the light emission color of the light emitting diode is not a color that satisfies the safety regulations, the color of the micro prism sheet itself or the color of the light transmissive colored plate arranged in front of the micro prism sheet is set to an appropriate color. By doing so, it is possible to obtain a light color that complies with safety regulations. In the latter case, the color seen from the outside when it is not lit is the white color of the micro prism sheet, and the color of the colored plate can be seen through.

[0009]

【Example】

 FIG. 1 shows a combination type signal indicator light for a vehicle in which the left side is a curved direction indicator light and the right side is a sideways light. In this vehicle signal indicator light, a protective cover 3 is attached to a base 1 on which a light emitting diode 2 is mounted, and a micro prism sheet 4 is arranged between the light emitting diode 2 and the protective cover 3.

The light emitting diode 2 emits light when a voltage is applied, and the color of the emitted light varies depending on the material. For example, when red light emission is desired, GaP to which Zn and O are added as impurities or direct transition is used. A material such as GaAs _0.6 P _0.4 which is a mixed crystal of indium GaAs and indirect transition GaP is used, and in the case of yellow (amber) emission, a material such as GaAs _0.15 P _0.85 is used.

The protective cover 3 is molded of a plastic material having a high light-transmitting property, and it is not necessary to form prismatic unevenness on the back surface unlike a conventional product.

The microprism sheet 4 can be obtained from a commercially available product and has a thickness of 0.2 to 0. A 3 mm polyester sheet has approximately 3600 pieces / cm ² of precise micro prisms formed on one side, and can be cut or bent with scissors. Therefore, even if it is curved like the left direction indicator lamp portion, it is easy to dispose the microprism sheet 4 following the curve. Moreover, since the micro-prism itself is minute, even if it is curved, it has almost no effect on the angle of the prism. By mounting the micro prism sheet 4 so that the micro prism surface is opposed to the back surface of the protective cover 3, the emission color of the light emitting diode 2 is diffused by the micro prism surface of the micro prism sheet 4 to be a lamp light. In the structure of FIG. 1, if the protective cover 3 is colorless, the light emission color of the light emitting diode 2 becomes the light emission color. Therefore, the light emission diode 2 of the left direction indicator light, which is defined as the yellow light or the amber light, is used. For this purpose, it is necessary to use a light emitting diode that emits yellow light.

However, since the micro-prism sheet 4 has a thin thickness of 0.2 to 0.3 mm, it has a transparency that is unprecedented as a prism assembly, so that even a colored product will not cause any problems. Absent. However, in this case, the color seen from the outside when it is not lit is the color of the micro prism sheet, so it is restricted by the color specified for safety.

On the other hand, as in the case of the turn signal lamp on the left side of FIG. 2, when the light-transmitting colored plate 5 is arranged in front of the micro prism sheet 4, the light emission of the light emitting diode 2 is increased. Even if the light is red light, the color of the light-transmitting colored plate 5 arranged in front of the micro-prism sheet 4 is set to green, so that the light-transmitting pressure plate 5 has a predetermined safety after being transmitted. It can be changed to yellow light which is the light color. In addition, the color seen from the outside when it is not lit is the white color of the micro prism sheet, and the green color of the colored plate is not seen through.

In the above-mentioned embodiments, the combination of the turn signal light and the side light is shown, but it is of course possible to use a single type, as well as a tail light, a stop light, a turn signal light, a backward light, a rear reflector, etc. It is also possible to construct a so-called combination lamp by incorporating the above into one lamp.

[0016]

[Effect of the device]

 As described above, when the shape of the signal indicator light is a complicated curved surface, the ease of designing and manufacturing by using the micro prism sheet and the advantage that it can be provided at a low cost can be fully exhibited. The use of light-emitting diodes makes them compact, lightweight, long-life, vibration- and shock-resistant, robust and reliable, operates at low voltage and low current, and can be driven by semiconductor circuits. Since the signal indicator light can be made thinner, deep drawing of the body part where the signal indicator light is mounted becomes easier.

Even if the light emission color of the light emitting diode is different from the light color specified for safety, the use of the light-transmissive coloring plate allows the light color to be the specified light color after passing through the coloring plate. The color seen from the outside when it is not lit is the white color of the micro prism sheet, and it is possible to prevent the color of the colored plate from being seen through.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an automobile signal indicator lamp according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention different from FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Light emitting diode 3 ... Protective cover 4 ... Micro prism sheet 5 ... Light transmissive coloring plate

Claims (3)

[Scope of utility model registration request] 1. A light-transmitting protective cover 3 formed of a plastic material and having a flat rear surface is attached to a base 1 on which a light-emitting diode 2 is mounted as a light source, and one surface is provided between the light-emitting diode 2 and the protective cover 3. A signal indicator lamp for an automobile, in which a plastic micro-prism sheet 4 having a large number of precision micro-prism surfaces is arranged so that the micro-prism surface faces the back surface of the protective cover 3. 2. A light transmissive protective cover 3 formed of a plastic material and having a flat rear surface is attached to a base 1 on which a light emitting diode 2 is mounted as a light source, and one surface is provided between the light emitting diode 2 and the protective cover 3. A signal indicator lamp for an automobile, in which a large number of precision microprism surfaces are formed and a colored plastic microprism sheet 4 is arranged so that the microprism surfaces face the back surface of the protective cover 3. 3. A base 1 having a light emitting diode 2 mounted thereon as a light source is provided with a protective cover 3 formed of a plastic material having a high light-transmitting property and having a flat rear surface, and between the light emitting diode 2 and the protective cover 3. An automotive signal comprising a light-transmitting colored plate 5 and a plastic micro-prism sheet 4 having a large number of precision micro-prism surfaces formed on one side thereof so that the micro-prism surface faces the back surface of the protective cover 3. Indicator light.