JP2019194950A - Light source filament for led bulb and filament type led bulb - Google Patents

Abstract

To increase luminance of a light source filament 10 and illuminance of a filament type LED bulb 20 without impairing durability.SOLUTION: An aluminum material is used for a material of a substrate 11 in which an LED chip row 15 is mounted. The heat generated when lighting the LED chip row 15 can be discharged through the substrate 11 made of aluminum. Therefore, by strengthening a drive current of the LED chip row 15, the luminance of the LED chip row 15 can be increased. Accordingly, the illuminance of the filament type LED bulb 20 in which this filament 10 is used in the light source can be increased. By twisting the substrate 11, a light emitting surface where the LED chip row 15 is formed is extended in a spiral manner from one end side to the other end side of the substrate. Since the emission direction of the light of the LED chip row 15 is not restricted to one direction, it can be prevented that the illumination effect is impaired by the shadow of the filament 10 when lighting the filament type LED bulb 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a filament for a light source of an LED bulb and a filament type LED bulb.

  Japanese Patent No. 5687524 discloses one type of filament type LED bulb. In this filament type LED bulb, a plurality of LED chips are arranged along the longitudinal direction on the surface of a substrate, adjacent LED chips are connected in series to form an LED chip array, and a positive electrode pin is provided at one end of the LED chip array Or, connect a negative electrode pin, connect a negative electrode pin or a positive electrode pin to the other end of the LED chip row, cover the LED chip row with a luminescent powder layer, and connect the positive electrode pin and the negative electrode pin from the longitudinal end of the substrate. Is provided with a light source filament.

  In this filament type LED bulb, a glass pedestal and a glass column protruding from the pedestal into the glove are integrally provided at the bottom of the globe covering the light source filament, and a base is attached to the outer side of the bottom of the globe. Built-in drive circuit that controls the lighting of LED chip rows, connecting the filament to the upper end of the column with a wire that also serves as the lead wire connecting the filament and drive circuit, and hanging the filament from the upper end of the column Is standing.

Japanese Patent No. 5687524

  In the conventional light source filament described above, a transparent glass material or film material is used as the material of the substrate. Therefore, not only the light of the LED chip is transmitted through the luminescent powder layer, but also part of it is irregularly reflected by the luminescent powder layer and transmitted through the transparent substrate, so that both the front and back surfaces of the substrate become the light emitting surface.

  By the way, if the drive current of the LED chip row of the light source filament is increased to increase the illuminance of the filament type LED bulb, the brightness of the LED chip row is increased accordingly. The above LED chip array of conventional light source filaments is surrounded by a substrate and a luminescent powder layer, but glass or film as the material of the substrate is also a transparent paste material mixed with fluorescent powder as the material of the luminescent powder layer Both have low thermal conductivity. For this reason, the LED chip array sealed between the substrate and the luminescent powder layer is deteriorated due to an increase in the temperature thereof, and there is a problem that the durability life is shortened.

Recently, as means for solving such problems, a light source filament using a metal material having a high thermal conductivity such as an aluminum material as a substrate material has been put to practical use.
According to this light source filament, the heat generated from the LED chip array is dissipated through the metal substrate, so that the drive current of the LED chip array is increased to increase the brightness of the LED chip array, and hence the illuminance of the filament type LED bulb. It became possible.

  However, since the metal substrate does not transmit light, both the front and back surfaces of the substrate do not become the light emitting surface like the conventional light source filament, only the surface on which the LED chip array is provided becomes the light emitting surface, and the other surfaces are It becomes a non-light emitting surface. Therefore, the light emission direction of the LED chip array is limited to a specific direction, and when the filament type LED bulb is turned on, a shadow of the substrate is generated in the globe, and the illumination effect is impaired.

  Moreover, in the above-mentioned conventional filament type LED bulb, the light source filament is suspended from the upper end of the glass column, and is erected on the pedestal. If a shock is applied, the glass column may be damaged, and handling is necessary.

In view of such problems, the present invention has an object to provide a light source LED bulb and a filament type LED bulb that can increase the brightness of the filament for the light source, and thus the illuminance of the filament type LED bulb, without impairing the durability. To do.
It is another object of the present invention to provide a filament type LED light bulb that is not easily damaged even when subjected to vibration or impact during transportation or mounting, is easy to handle, and is easy to use.

In the present invention, a plurality of LED chips are arranged along the longitudinal direction on the surface of a substrate, adjacent LED chips are connected in series to form an LED chip array, and a positive electrode pin or a negative electrode is formed at one end of the LED chip array. Connect the pin, connect the negative electrode pin or the positive electrode pin to the other end of the LED chip row, cover the LED chip row with the luminescent powder layer, and project the positive electrode pin and the negative electrode pin from the longitudinal end of the substrate LED filament light source filament,
While using a metal material for the substrate, forming an insulator layer on the substrate,
Forming the LED chip array on the surface of the insulator layer;
The light emitting surface on which the LED chip array is formed is spirally extended by twisting the other end of the substrate with respect to one end of the substrate.

  Preferably, the other end of the substrate is twisted at a twist angle of 90 degrees or more with respect to one end of the substrate. Preferably, an aluminum material is used for the substrate.

Further, the present invention provides a plurality of LED chips arranged in the longitudinal direction on the surface of the substrate, and adjacent LED chips are connected in series to form an LED chip array, and a positive electrode pin or Connect the negative electrode pin, connect the negative electrode pin or the positive electrode pin to the other end of the LED chip row, cover the LED chip row with a luminescent powder layer, and connect the positive electrode pin and the negative electrode pin from the longitudinal end of the substrate. It has a light source filament for LED bulbs
The light source filament is sealed in the globe, the base that protrudes into the globe is provided at the bottom of the globe, the light source filament is erected from the base, the base is attached to the outside of the bottom of the globe, and the LED chip row is controlled to light the base. A filament type LED bulb with a built-in drive circuit,
While using a metal material for the substrate of the light source filament, forming an insulator layer on the upper surface of the substrate,
Forming the LED chip array on the surface of the insulator layer;
The light emitting surface on which the LED chip array is formed is spirally extended by twisting the other end of the substrate with respect to one end of the substrate.

Preferably, a wire is embedded in the pedestal as a lead wire for connecting the light source filament and the drive circuit, and a plus electrode pin and a minus electrode pin are connected to the end protruding from the pedestal of the wire to connect the light source filament from the pedestal. It is mounted so that it stands upright.
Preferably, the plus electrode pin and the minus electrode pin are connected to the end portion protruding from the base of the wire so that the twisted substrate is curved.

  According to the light source filament of the LED bulb according to the present invention, since the metal material is used as the material of the substrate on which the LED chip array is mounted, the heat generated when the LED chip array is turned on can be dissipated through the metal substrate. Therefore, the drive current of the LED chip array can be increased to increase the brightness of the LED chip array. Therefore, the illuminance of the filament type LED bulb can be increased by using the filament according to the present invention as the light source of the filament type LED bulb.

  In particular, according to the present invention, the light emitting surface on which the LED chip array is formed extends spirally from one end side to the other end side of the substrate by twisting a metal substrate. Therefore, the light emission direction of the LED chip array is not limited to one direction. Further, by increasing the twisting angle of the substrate, it becomes possible to radiate light to the entire area around the substrate, and it is possible to prevent the illumination effect from being impaired by the shadow of the filament when the filament type LED bulb is turned on.

  In addition, the conventional glass and film material filaments used as a substrate are weak and difficult to stand up, so a glass support that is translucent and does not cause shadows was erected and suspended from the support. Since the metal substrate is strong, the filament can be erected on the pedestal by connecting the electrode pin to the wire protruding from the pedestal without being suspended from the glass column. Therefore, since the glass support can be omitted, there is no possibility that the glass support is damaged when the filament LED bulb is transported or attached, and the handling becomes easy.

It is a perspective view which shows the filament for light sources of the LED bulb which concerns on the Example of this invention. It is the end elevation seen from the end of the longitudinal direction which shows the filament. It is typical explanatory drawing which shows the structure of the filament type LED bulb provided with the filament. It is a perspective view which shows the filament for light sources of the LED bulb which concerns on the other Example of this invention. It is the end elevation seen from the end of the longitudinal direction which shows the filament. It is a perspective view which shows the filament for light sources of the LED bulb which concerns on the other Example of this invention. It is the end elevation seen from the end of the longitudinal direction which shows the filament. It is a perspective view which shows the filament for light sources of the LED bulb which concerns on the other Example of this invention. It is the end elevation seen from the end of the longitudinal direction which shows the filament.

  The present invention will be described below with reference to the drawings. 1 and 2 show a light source filament 10 of an LED bulb according to an embodiment of the present invention. The filament 10 includes a substrate 11 made of an elongated aluminum material. The surface of the substrate 11 is covered with an insulator layer 12, and a plurality of LED chips 13 are fixed on the insulator layer 12 with a transparent adhesive. Adjacent LED chips 13 are connected in series with lead wires 14 to form LED chip rows 15. The LED chip array 15 is covered with a luminescent powder layer 16 made of a mixture of luminescent powder and a transparent medium such as silica gel or epoxy resin.

A positive electrode pin 17 is fixed to one end 11 a in the longitudinal direction of the substrate 11. The plus electrode pin 17 is connected to one end of the LED chip array 15, and the tip of the plus electrode pin 17 protrudes from the luminescent powder layer 16. A minus electrode pin 18 is fixed to the other end 11 b in the longitudinal direction of the substrate 11 and protrudes from the luminescent powder layer 16. The positive electrode pin 17 is connected to one end of the LED chip row 15 by a lead wire 14, and the negative electrode pin 18 is connected to the other end of the LED chip row 15 by a lead wire 14.
The substrate 11 has its other end 11b twisted at a twist angle of 90 degrees with respect to its one end 11a. For this reason, the light emitting surface on which the LED chip array 15 is formed extends in a spiral shape.

  FIG. 3 shows a filament type LED bulb 20 provided with the filament 10 as a light source. The filament type LED bulb 20 includes a single filament 10 and a transparent glass globe 21 covering the filament 10, a base 22 is integrally formed inside the bottom of the globe 21, and a base 23 is formed outside the bottom of the globe 21. A drive circuit 24 that is mounted and controls the lighting of the filament 10 is incorporated in the base 23.

  The pedestal 22 is composed of a solid upper part 22a and a hollow lower part 22b integrated with the upper part 22a. The inside of the lower part 22b discharges air in the globe 21 at the time of manufacturing the light bulb. An exhaust pipe 22c that constitutes an exhaust passage for filling the inert gas into the globe 21 is suspended from the upper portion 22a. An upper end opening 22 d of the exhaust pipe 22 c is disposed on a side surface of the upper portion 22 a of the pedestal, and a lower end opening 22 e protrudes from the bottom surface of the globe 21. A skirt portion 22 f is formed at the lower end of the base 22.

  Two long and short wire-like lead wires 25 and 26 connecting the filament 10 and the drive circuit 24 penetrate the pedestal 22, and the leading ends of both lead wires 25 and 26 protrude from the top of the pedestal 22. The tip of the plus electrode pin 17 of the filament 10 is welded to the tip of the short lead 25 and the tip of the minus electrode pin 18 is welded to the tip of the long lead 26. The filament 10 is attached to the pedestal 22 so as to stand upright from the pedestal 22 by welding the plus electrode pin 17 and the minus electrode pin 18 to the distal ends of the wire-like lead wires 25 and 26.

  The structure of the light source filament 10 and the filament type LED bulb 20 including the filament 10 according to the present embodiment is as described above, and an aluminum material is used as the material of the substrate 11 on which the LED chip array 15 is mounted. Heat generated when the LED chip array 15 is turned on can be dissipated through the aluminum substrate 11. Therefore, the drive current of the LED chip array 15 can be increased to increase the luminance of the LED chip array 15. Therefore, the illuminance of the filament type LED bulb 20 using the filament 10 as a light source can be increased.

  In particular, according to the present invention, the light emitting surface on which the LED chip array 15 is formed extends spirally from one end 11 a side to the other end 11 b side of the substrate by twisting the substrate 11. Therefore, since the light emission direction of the LED chip array 15 is not limited to one direction, it is possible to prevent the illumination effect from being impaired by the shadow of the filament 10 when the filament type LED bulb 20 is turned on.

  Further, since the aluminum substrate 11 is strong, if the electrode pins 17 and 18 are connected to the wire-like lead wires 25 and 26 protruding from the pedestal 22 without being suspended from the glass column, The filament 10 can be erected on the base 22. Therefore, since the glass support can be omitted, the glass support is not likely to be damaged when the filament type LED bulb 20 is transported or attached, and the handling becomes easy.

  In the above-described embodiment, the filament substrate is twisted 90 degrees. However, by increasing the twist angle of the substrate 11, light can be emitted to the entire circumference of the substrate 11. 4 and 5 show a filament 10A obtained by twisting the substrate 11 by 180 degrees. 6 and 7 show a filament 10B obtained by twisting the substrate 11 by 270 degrees. 8 and 9 show a filament 10C obtained by twisting the substrate 11 by 360 degrees.

  In this embodiment, an aluminum material is used as the material of the substrate, but other metal materials such as iron and copper can also be used. Moreover, although the board | substrate with a rectangular cross section was used, cross-sectional shape is not limited to this, A polygonal or circular board | substrate can also be used.

In the filament type LED bulb 20 according to the present embodiment, one filament 10 is erected linearly on the base 22 as a light source. However, a plurality of filaments 10 are provided or each filament 10 is gently curved. It can also be made to stand on the pedestal 22.
Furthermore, when a plurality of filaments 10 are erected on the pedestal 22, a support may be provided on the pedestal 22, and the filament 10 may be supported by the support.

DESCRIPTION OF SYMBOLS 10, 10A, 10B, 10C ... Light source filament 11 of LED bulb ... Substrate 11a ... One end 11b of substrate ... Other end 12 of substrate ... Insulator layer 13 ... LED chip 14 ... Lead wire 15 ... LED chip row 16 ... Luminescent powder Layer 17 ... Positive electrode pin 18 ... Negative electrode pin 20 ... Filament type LED bulb 21 ... Globe 22 ... Base 23 ... Base 24 ... Drive circuit 25, 26 ... Wire-shaped lead wire

Claims (6)

A plurality of LED chips are arranged along the longitudinal direction on the surface of the substrate, adjacent LED chips are connected in series to form an LED chip row, and a positive electrode pin or a negative electrode pin is connected to one end of the LED chip row. The LED light bulb has a negative electrode pin or a positive electrode pin connected to the other end of the LED chip row, the LED chip row is covered with a luminescent powder layer, and the positive electrode pin and the negative electrode pin protrude from the longitudinal end of the substrate. A filament for a light source,
While using a metal material for the substrate, forming an insulator layer on the substrate,
Forming the LED chip array on the surface of the insulator layer;
A light source filament for an LED bulb, wherein a light emitting surface on which an LED chip array is formed is spirally extended by twisting the other end of the substrate with respect to one end of the substrate.   The filament for a light source of an LED bulb according to claim 1, wherein the other end of the substrate is twisted about 90 degrees or more with respect to one end of the substrate.   The LED light source filament according to claim 1, wherein an aluminum material is used for the substrate. A plurality of LED chips are arranged along the longitudinal direction on the surface of the substrate, adjacent LED chips are connected in series to form an LED chip row, and a positive electrode pin or a negative electrode pin is connected to one end of the LED chip row. The LED light bulb has a negative electrode pin or a positive electrode pin connected to the other end of the LED chip row, the LED chip row is covered with a luminescent powder layer, and the positive electrode pin and the negative electrode pin protrude from the longitudinal end of the substrate. With a light source filament,
The light source filament is sealed in the globe, the base that protrudes into the globe is provided at the bottom of the globe, the light source filament is erected from the base, the base is attached to the outside of the bottom of the globe, and the LED chip row is controlled to light the base. A filament type LED bulb with a built-in drive circuit,
While using a metal material for the substrate of the light source filament, forming an insulator layer on the upper surface of the substrate,
Forming the LED chip array on the surface of the insulator layer;
A filament type LED bulb characterized in that a light emitting surface on which an LED chip array is formed is spirally extended by twisting the other end of the substrate with respect to one end of the substrate.   A wire is embedded in the pedestal as a lead wire for connecting the light source filament and the drive circuit, and a positive electrode pin and a negative electrode pin are connected to the end protruding from the pedestal of the wire so that the light source filament is erected from the pedestal. The filament type LED bulb according to claim 4, wherein the filament type LED bulb is attached.   6. The filament type LED light bulb according to claim 5, wherein a plus electrode pin and a minus electrode pin are connected to an end portion protruding from the pedestal of the wire so that the twisted substrate is curved.

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