JPH051596U - Luminous pole - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a light emitting pole capable of contributing to safe driving by improving the visibility such as the presence of a vehicle and the width of a vehicle when driving in a dark place such as night. [Constitution] The pole body 31 is conical or pyramid-shaped, and its top portion is spherical and is made of a colorless transparent or colored transparent resin material. Then, the light scattering material 32 is mixed in the resin material of the spherical top portion of the pole body 31. Further, the light emitting diode 40 is arranged in the vicinity of the bottom surface inside the pole body 31 with the light emitting surface facing the top direction. As a result, in the light emitting pole 100 of the present invention, the light of the light emitting diode 40 disposed near the bottom surface causes the cone or pyramid-shaped portion to dimly light, and the top portion of the tip where the light scattering material 32 is mixed to shine strongly. become. Therefore, an automobile equipped with one such light emitting pole on each of the left and right sides of the upper surface of the luggage compartment has improved visibility from a following vehicle when traveling in a dark place such as at night.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light emitting pole for clarifying the presence and width of a vehicle when driving in a dark place such as at night.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there is known a pole that is attached to a corner portion such as a bumper of an automobile so that it is easy to check the distance to the corner portion and assists in garage parking.

[0003]

[Problems to be solved by the device]

 The pole was an accessory that had only a decorative effect other than the above purposes. In other words, when driving in a dark place such as at night, there was nothing that could be positively illuminated to reveal the presence or width of our vehicle, such as the following vehicle.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide visibility in the presence of a vehicle and the width of a vehicle when driving in a dark place such as at night. It is to provide a light emitting pole that can improve driving efficiency and contribute to safe driving.

[0005]

[Means for Solving the Problems]

 The configuration of the device for solving the above-mentioned problems is a pole body formed of a colorless or transparent transparent resin material in the shape of a cone or a pyramid, and a light mixed in the resin material at the top of the pole body. It is characterized by comprising a scattering material and a semiconductor light emitting element which is disposed in the vicinity of the bottom surface inside the pole body with the light emitting surface facing the top of the head.

[0006]

[Action and effect]

 The pole body has a cone or pyramid shape and is made of a colorless transparent or colored transparent resin material. Then, the light-scattering material is mixed with the resin material of the top portion of the pole body. A light emitting diode, which is a semiconductor light emitting element, is arranged in the vicinity of the bottom surface inside the pole body with the light emitting surface facing the top. In such a light emitting pole, the light from the light emitting diode hardly escapes outside in the conical or pyramidal portion of the pole body, and is guided to the top of the pole body. Then, the light from the light emitting diode guided by the light scattering material mixed in the resin material of the crown portion is scattered. That is, in the light emitting pole of the present invention, the light emitted from the light emitting diode arranged near the bottom surface causes the cone-shaped or pyramid-shaped portion to dimly light, and the crown portion at the tip away from the bottom surface strongly shines. Therefore, for example, a car equipped with such light-emitting poles on the left and right sides of the upper surface of the luggage compartment can be visually discerned by the following cars, such as the presence or width of our car, when driving in the dark at night. The property is improved.

[0007]

【Example】

 Hereinafter, the present invention will be described based on specific embodiments. FIG. 1 is a vertical sectional view showing a structure of a light emitting pole according to the present invention. The light emitting pole 100 is mainly composed of a pole body 31 and a light emitting diode 40. The pole body 31 has a conical or pyramidal shape and a spherical top portion, and is formed of a resin material such as a colorless transparent or colored transparent acrylic resin or polycarbonate resin. The light scattering material 32 such as beads is mixed in the resin material of the spherical top portion of the pole body 31. The above-mentioned light emitting diode 40 is arranged in the vicinity of the bottom surface inside the pole body 31 with the light emitting surface facing upward in the direction of the crown.

FIG. 2 is a vertical cross-sectional view showing a layer structure of a blue light emitting diode 10 using a gallium nitride-based compound semiconductor suitable for being disposed in the light emitting pole 100 according to the present invention. The light emitting diode 10 has a sapphire substrate 1, and a 500 Å buffer layer 2 of AlN is formed on the sapphire substrate 1. Under the buffer layer 2, a high carrier concentration n ⁺ layer 3 made of GaN having a film thickness of 2.2 μm and a low carrier concentration n layer 4 made of GaN having a film thickness of 1.5 μm are sequentially formed. An i layer 5 made of GaN having a film thickness of 0.1 μm is formed under the low carrier concentration n layer 4. Then, an electrode 7 formed of aluminum and connected to the i layer 5 and an electrode 8 formed of aluminum and connected to the high carrier concentration n ⁺ layer 3 are formed.

Next, a manufacturing process of the light emitting diode 10 having this structure will be described with reference to FIGS. 3 and 4. The light emitting diode 10 was manufactured by vapor phase epitaxy using a metal organic compound vapor phase epitaxy method (hereinafter referred to as MOVPE). The gas used was NH ₃ , carrier gas H ₂ , trimethylgallium (Ga (C H ₃ ) ₃ ) (hereinafter referred to as TMG), and trimethylaluminum (Al (CH ₃ ) ₃ ) (hereinafter referred to as TMA). And silane (SiH ₄ ) and diethylzinc (hereinafter referred to as DEZ). First, the single crystal sapphire substrate 1 having the a-plane as the main surface, which has been cleaned by organic cleaning and heat treatment, is mounted on the susceptor placed in the reaction chamber of the MOVPE apparatus. Next, the sapphire substrate 1 was vapor-phase etched at a temperature of 1100 ° C. while flowing H ₂ into the reaction chamber at a flow rate of 2 l / min under normal pressure. Next, the temperature is lowered to 400 ° C., H ₂ is supplied at 20 l / min, NH ₃ is supplied at 10 l / min, and TMA is supplied at 1.8 × 10 ⁻⁵ mol / min. A buffer layer 2 was formed. Then, maintaining the temperature of the sapphire substrate 1 to 1150 ° C., the H ₂ 20 l / min, the NH ₃ 10 l / min, 1.7 × 10 ^-4 mol / min TMG, and diluted with H ₂ to 0.86ppm Silane (SiH ₄ ) was supplied at a rate of 200 ml / min for 30 minutes to form a high carrier concentration n ⁺ layer 3 made of GaN having a film thickness of 2.2 μm and a carrier concentration of 1.5 × 10 ¹⁸ / cm ³ . Subsequently, the temperature of the sapphire substrate 1 was maintained at 1150 ° C., H ₂ was supplied at 20 l / min, NH ₃ was supplied at 10 l / min, and TMG was supplied at a rate of 1.7 × 10 ⁻⁴ mol / min for 20 minutes to form a film. A low carrier concentration n layer 4 made of GaN having a thickness of 1.5 μm and a carrier concentration of 1 × 10 ¹⁵ / cm ³ was formed. Next, the sapphire substrate 1 is set to 900 ° C., H ₂ is 20 l / min, NH ₃ is 10 l / min, TMG is 1.7 × 10 ⁻⁴ mol / min, and DEZ is 1.5 × 10 ⁻⁴ mol / min. The i-layer 5 made of GaN and having a film thickness of 0.1 μm was formed by supplying the i-layer 5 at a rate of 1 minute. In this way, a multilayer structure as shown in FIG. 3 (a) was obtained. Next, as shown in FIG. 3B, a SiO ₂ layer 11 having a thickness of 2000 Å was formed on the i layer 5 by sputtering. Next, a photoresist 12 is applied on the SiO ₂ layer 11, and the photoresist 12 is formed by photolithography into a pattern in which the photoresist at the electrode formation site for the high carrier concentration n ⁺ layer 3 is removed. did. Next, as shown in FIG. 3C, the SiO ₂ layer 11 not covered with the photoresist 12 was removed with a hydrofluoric acid-based etching solution.

Next, as shown in FIG. 4D, the photoresist 12 and SiO₂I layer 5 in a portion not covered by layer 11 and low carrier concentration n layer 4 and high carrier concentration n below it⁺Part of the upper surface of layer 3 has a vacuum degree of 0.04 Torr and high frequency power of 0.44 W / cm², BCl₃Gas was supplied at a rate of 10 ml / min for dry etching, and then dry etching was performed with Ar. Next, as shown in FIG. 4 (e), the SiO 2 remaining on the i layer 5 is₂Layer 11 was removed with hydrofluoric acid. Next, as shown in FIG. 4 (f), an Al layer 13 having a thickness of 3000 Å was formed on the entire surface of the sample by vapor deposition. Then, a photoresist 14 is applied on the Al layer 13 and the photoresist 14 is formed by photolithography to have a high carrier concentration n. ⁺ A pattern was formed into a predetermined shape so that the electrode portions for the layer 3 and the i layer 5 remained. Next, using the photoresist 14 as a mask, the exposed portion of the lower Al layer 13 is etched with a nitric acid-based etching solution, and the photoresist 14 is removed with acetone to obtain a high carrier concentration n.⁺An electrode 8 of layer 3 and an electrode 7 of i layer 5 were formed. Thus, the gallium nitride-based light emitting device having the MIS (Metal Insulator Semiconductor) structure shown in FIG. 2 can be manufactured.

FIG. 5 is a partial vertical cross-sectional view showing a bonding state between the above-described blue light emitting diode 10 and the lead frame 20. The electrodes 7, 8 of the chip-shaped light emitting diode 10 are joined to the lead members 21, 22 of the lead frame 20 via the solder bumps 17, 18. After the chip-shaped light emitting diode 10 is bonded to the lead members 21 and 22, the lens portion 25 is formed of a transparent resin such as epoxy resin to form a light emitting diode 40 as shown in FIG. Then, in this light emitting diode 40, blue light is emitted from the light emitting regions located above and near the electrode 7 of the i layer 5 by applying a predetermined voltage to the lead members 21 and 22.

As shown in FIG. 6, the light emitting poles 100 configured as described above are arranged one on each of the left and right sides of the upper surface of the trunk, which is the rearmost part of the automobile. Then, when driving in a dark place such as at night, these light emitting poles 100 are clearly illuminated at a position higher than the indicator lights such as the stop lamp and the side lights on the rear surface of the automobile. Therefore, it is possible to improve the visibility of the driver of the following vehicle such as the existence of the vehicle and the width of the vehicle, which contributes to the safe driving of the vehicle. In addition, the appearance shape of the light emitting pole 100 is smart and beautiful, and even in a bright place such as daytime, the decoration effect can be sufficiently achieved even when the light emitting diode 40 is not emitting light. The light emitting diode arranged in the light emitting pole of the present invention is not limited to the above blue light emitting diode. Alternatively, the chip-shaped light emitting diode 10 joined to the lead members 21 and 22 shown in FIG. 5 may be directly disposed in the molding die and the pole body 31 may be formed of the same resin material as described above. Further, three light emitting diodes which respectively emit the three primary colors of light, red, green and blue, can be arranged adjacent to each other near the bottom surface of the light emitting pole. Then, it is possible to form a variable color light emitting pole capable of obtaining any colored light emission by changing the light emission intensity of each of the light emitting diodes.

FIG. 7 is a block diagram showing another embodiment of the light emitting pole according to the present invention. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. A metal thin film 35 is formed on the right side surface of the side surface of the pole body 31 of the light emitting pole 200 by sputtering, vacuum deposition or hot stamping. The metal thin film 35 may be formed by using a metal thin plate. A motor 51 is arranged below the pole body 31 as a rotating mechanism via a bearing 52. The light emitting pole 200 of the present embodiment is further rotated at the same time when the pole body 31 emits light, so that the decorative effect and the visibility are further improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a structure of a light emitting pole according to a specific embodiment of the present invention.

FIG. 2 is a configuration diagram showing a light emitting diode used in the light emitting pole according to the embodiment.

FIG. 3 is a vertical cross-sectional view showing a manufacturing process of a light emitting diode used for the light emitting pole according to the embodiment.

FIG. 4 is a vertical cross-sectional view subsequent to FIG. 3, showing a manufacturing process of a light-emitting diode used for the light-emitting pole according to the example.

FIG. 5 is a partial vertical cross-sectional view showing a joined state of a light emitting diode and a lead frame used in the light emitting pole according to the embodiment.

FIG. 6 is an explanatory view showing a state in which one light emitting pole according to the embodiment is arranged on each of left and right sides of a trunk room which is an upper surface of a rear portion of an automobile.

FIG. 7 is a schematic view showing another embodiment of the light emitting pole according to the present invention.

[Explanation of symbols]

1-Sapphire substrate 2-Buffer layer 3-High carrier concentration n ⁺ layer 4-Low carrier concentration n layer 5-i layer 7,8-Electrode 10-Light emitting diode (chip shape) 21,22 Lead member 31-Pole body 32-light scattering material 40-light emitting diode 100-light emitting pole

Claims (1)

[Claims for utility model registration] 1. A pole body made of a colorless transparent or colored transparent resin material in the shape of a cone or a pyramid, and light mixed in the resin material at the top of the pole body. A light emitting pole comprising a scattering material and a semiconductor light emitting element which is disposed in the vicinity of a bottom surface inside the pole body with a light emitting surface directed toward the top of the head.