JP2016085832A - Led light bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED light bulb capable of presenting a filament image by achieving a sparkling feeling by strong light diffusion.SOLUTION: In an LED light bulb 1 which is configured by accommodating an LED 3, a substrate 4 mounting the LED 3, and a part of metal terminals 5, 6 in which one end is electrically connected to the substrate 4, in a sealed space in a bulb having constant wall thickness t in which one end of a cylindrical body part 2A is sealed by a hollow hemispherical planar dome part 2B, and by drawing the other end of the metal terminals 5, 6 out of the bulb 2 by penetrating the other sealed part of the bulb 2. When an inner diameter of the dome part 2B of the bulb 2 is defined as r, and the wall thickness is defined as t, a light emitting point position on an optical axis of the LED 3 is set to be (1.6r+t) from an apex of the dome part 2B.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an LED bulb using an LED (light emitting diode) as a light source.

  For example, LEDs having advantages such as high brightness, long life, and power saving are being used as light sources for general lighting and vehicular lamps. Regarding the LED bulb using the LED as a light source, Patent Document 1 proposes an LED bulb shown in FIG.

  4 is a longitudinal sectional view of an LED bulb proposed in Patent Document 1. In the illustrated LED bulb 101, an LED chip 103 is disposed on a substrate 104 made of a material having low thermal conductivity, and the LED bulb is arranged. The chip 103 is electrically connected to the two lead terminals 105 and 106, and a part of the substrate 104, the LED chip 103 and the lead terminals 105 and 106 are melt-sealed at the opening of the glass tube. It is configured to be accommodated in an airtight container 102.

  In such an LED bulb 101, when a voltage is applied to the LED chip 103 via the lead wires 105 and 106, the LED chip 103 emits light and emits light of a predetermined wavelength, and this light is made of a glass hermetic container. The light passes through 102 and is irradiated to the outside.

JP 2005-108936 A

  However, in the LED bulb 101 shown in FIG. 4 proposed in Patent Document 1, since the top of the hermetic container 102 forms the lens portion 102a, highly directional light emitted from the LED chip 103 is emitted from the lens portion 102a. There was a problem that it was impossible to produce a filament image with a glittering feeling because the light was condensed and the light diffusibility was weak. The light emitting point of the LED chip 103 is proportional to the size of the LED chip 103.

  The present invention has been made in view of the above problems, and an object thereof is to provide an LED bulb capable of producing a filament image by realizing a glittering feeling due to strong light diffusibility.

  In order to achieve the above object, the invention according to claim 1 is characterized in that an LED is provided in a sealed space in a constant-thickness bulb in which one end of a cylindrical main body is sealed by a hollow hemispherical dome. The substrate on which the LED is mounted and a part of the metal terminal electrically connected to the substrate at one end are accommodated, and the other end of the metal terminal is made to penetrate the other end sealing portion of the valve to go outside the valve. In the LED bulb drawn out, the light emitting point position on the optical axis of the LED is set to (1.6r + t) from the apex of the dome part, where r is the inner diameter of the bulb dome part and t is the wall thickness. It is characterized by that.

  According to a second aspect of the present invention, in the first aspect of the invention, the boundary between the dome portion and the main body portion on the inner surface of the bulb is such that the light emission intensity of the LED is 50% of the light emission intensity on the optical axis. It arrange | positions on the straight line which passes through a point.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the lid member through which the metal terminal is inserted is separated from the substrate toward the other end sealing portion of the valve in the sealed space in the valve. It is characterized by being arranged at a position.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the lid member is made of the same type of substrate as the substrate.

  According to the first aspect of the present invention, since the thickness of the bulb is constant, light having high directivity emitted from the LED diffuses in all directions without being condensed by the dome portion of the bulb. For this reason, the diffusibility of the light radiate | emitted from LED is strengthened, the glittering feeling by strong diffusibility of light is implement | achieved, and the filament image can be produced on the said LED bulb. The light emitting point on the optical axis of the LED is set at a predetermined position, specifically, the inner diameter of the bulb dome is r and the wall thickness is t, and is set at a position (1.6r + t) from the apex of the dome. By doing so, the virtual image of the light emitting point is reflected on the inner surface of the dome portion of the bulb, the size of the light emitting point is enlarged by the real image and the virtual image, and a further glittering feeling is obtained by the light emitted from the LED.

  According to the invention of claim 2, since the boundary between the dome part and the main body part on the inner surface of the bulb is arranged on a straight line passing through a point where the emission intensity of the LED is 50% of the emission intensity on the optical axis, The inner surface of the dome portion where the virtual image of the light emitting point of the LED is reflected exists within the range of the half-value angle of the LED. Therefore, a virtual image of the light emitting point is clearly reflected on the inner surface of the dome portion of the bulb by the high intensity light of the LED, the size of the light emitting point is enlarged by this virtual image and the real image, and a filament image with a glittering feeling is formed on the LED bulb. Is granted.

  According to the third aspect of the present invention, the lid member into which the metal terminal is inserted is disposed in the sealed space in the valve at a position spaced from the substrate toward the other end sealing portion of the valve. It can serve as a measure for preventing the inflow of the sealant and injecting the sealant. In addition, since the LED and the substrate on which the LED is mounted are held at the tip of the metal terminal that extends through the lid member in the sealed space in the bulb, the LED is an image of the filament in the bulb, especially when the substrate is thinned. It exists in a floating state. For this reason, when an LED emits light, a filament such as a conventional incandescent bulb appears to emit light.

According to invention of Claim 4, soldering to the board | substrate of LED and a metal terminal and soldering to the cover member (another board | substrate) of a metal terminal can be performed simultaneously by a reflow process, and an LED bulb is produced. Efficiency is increased.

It is a longitudinal cross-sectional view of the LED bulb which concerns on this invention. It is a partial longitudinal cross-sectional view which shows the relationship between the light emission point position of LED of the LED bulb which concerns on this invention, a half value angle, and a bulb | bulb. It is a photograph which shows the light emission state of the LED bulb which concerns on this invention. It is a longitudinal cross-sectional view of the LED bulb proposed in patent document 1.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of an LED bulb according to the present invention, and FIG. 2 is a partial longitudinal sectional view showing a relationship between a light emitting point position and half-value angle of the LED of the LED bulb and a bulb.

  An LED bulb 1 according to the present invention includes a light source LED (hereinafter, “LED chip” and “LED package” are collectively referred to as “LED”) 3 and a LED 3 in a sealed space inside a hollow bulb 2. And a part of the two metal terminals 5 and 6 whose one end (the upper end in FIG. 1) is electrically connected to the substrate 4 and the lid member 7, and one end opening of the valve 2 It is configured by sealing the portion 2a (lower end opening in FIG. 1) with the sealant 8.

  The said valve | bulb 2 is comprised by the transparent glass or resin by the hollow shape, The thickness t is made constant. And this valve | bulb 2 is a bottomed cylindrical member with which the top part of cylindrical main-body part 2A was sealed by the dome part 2B of hollow hemispherical shape, The lower end is a lower end opening part as mentioned above. Opened as 2a.

  Although not shown, lands for mounting the LEDs 3 are formed on the upper surface of the substrate 4 and lands for mounting the metal terminals 5 and 6 are formed on the lower surface, respectively. The both sides of the substrate 4 are connected by through holes, and the through holes are filled with metal or resin (flat through hole structure), and the land of the LED 3 is formed there.

  As described above, one end (the upper end in FIG. 1) of the two metal terminals 5 and 6 is electrically connected to the substrate 4, but these metal terminals 5 and 6 extend downward from the substrate 4. It extends in parallel and penetrates the lid member 7 and the sealant 8 and extends to the outside of the valve 2. Here, in the present embodiment, the lid member 7 is configured by the same type of substrate as the substrate 4 on which the LED 3 is mounted, and is positioned and disposed in the vicinity of the lower end opening 2 a of the bulb 2. That is, stopper portions 5a and 6a are integrally formed at predetermined positions of the portions of the two metal terminals 5 and 6 facing the valve 2, and the lid member 7 through which the metal terminals 5 and 6 are inserted is The positioning is made by contacting the stopper portions 5a and 6a formed on the metal terminals 5 and 6, respectively. In the present embodiment, the thickness of the substrate 4 on which the LED 3 is mounted is set to be thinner than the thickness of the lid member 7 (thickness 0.4 mm).

  Therefore, in the LED bulb 1 according to the present invention, the thin substrate 4 and the substrate 4 are mounted on the upper ends of the two metal terminals 5 and 6 rising in parallel from the lid member 7 in the sealed space in the bulb 2. The LED 3 is held, and the torii structure is configured by the substrate 4, the lid member 7, and the two metal terminals 5 and 6 that connect the two.

  Here, the relationship between the light emitting point position and half-value angle of the LED 3 of the LED bulb 1 according to the present invention and the bulb 2 is shown in FIG. 2, but in this embodiment, the inner diameter of the dome portion 2B of the bulb 2 is r, When the thickness is t, the light emitting point position on the optical axis x of the LED 3 is set to (1.6r + t) downward from the apex p of the dome portion 2B of the bulb 2.

  In the present embodiment, the boundary b between the dome portion 2B and the main body portion 2A on the inner surface of the bulb 2 is on a straight line L passing through a point where the light emission intensity of the LED 3 is 50% of the light emission intensity on the optical axis x. Is arranged. For example, when the LED 3 has a light distribution characteristic with a half-value angle θ = 120 °, the boundary portion b between the dome portion 2B and the main body portion 2A on the inner surface of the bulb 2 has an angle 30 from the horizontal plane passing through the light emitting point of the LED 3. It is located above by °.

  Thus, in the LED bulb 1 according to the present invention, when a voltage is applied to the LED 3 from a power source (not shown) via the two metal terminals 5 and 6, the LED 3 emits light, and the light is transparent. In this embodiment, since the wall thickness t of the bulb 2 is constant, light having high directivity emitted from the LED 3 is collected by the dome portion 2B of the bulb 2. It spreads in all directions without. For this reason, the diffusibility of the light radiate | emitted from LED3 is strengthened, the glittering feeling by the strong diffusibility of light is implement | achieved, and the said LED bulb 1 can produce a filament image. Further, assuming that the light emitting point on the optical axis x of the LED 3 is a predetermined position, specifically, the inner diameter of the dome portion 2B of the bulb 2 is r, and the wall thickness is t, (1.6r + t ), The virtual image of the light emitting point is reflected on the inner surface of the dome portion 2B of the bulb 2, the size of the light emitting point is enlarged by the real image and the virtual image, and the light emitted from the LED 3 has a further glittering feeling. can get. Here, the state of light emission in the LED bulb 1 is shown in FIG. As shown in FIG. 3, it can be seen that not only the real image but also the virtual image 9 is reflected by the light emission of the LED 3, so that the size of the light emitting point is enlarged.

  Furthermore, in the present embodiment, the boundary portion b between the dome portion 2B and the main body portion 2A on the inner surface of the bulb 2 is on a straight line L passing through a point where the light emission intensity of the LED 3 is 50% of the light emission intensity on the optical axis x. Therefore, the inner surface of the dome portion 2B where the virtual image of the light emitting point of the LED 3 is reflected exists within the range of the half-value angle of the LED 3. Therefore, the virtual image of the light emitting point is clearly reflected on the inner surface of the dome portion 2B of the bulb 2 by the high intensity light of the LED 3, and the size of the light emitting point is enlarged by the virtual image and the real image, and the LED bulb 1 has a glittering feeling. A filament image is applied.

  Further, in the present embodiment, the lid member 7 through which the metal terminals 5 and 6 are inserted is disposed in the sealed space in the bulb 2 at a position separated from the substrate 4 toward the lower end sealing portion side of the bulb 2. 7 can serve as a measure for preventing the sealant 8 from flowing into the valve 2 and for the amount of the sealant 8 to be injected. Further, since the LED 3 and the substrate 4 on which the LED 3 is mounted are held at the tips of the metal terminals 5 and 6 extending through the lid member 7 in the sealed space in the bulb 2, the LED 3 is particularly thin when the substrate 4 is thinned. Exists in a state of floating in the image of the filament in the bulb 2. For this reason, when the LED 3 emits light, a filament such as a conventional incandescent bulb appears to emit light.

  In this embodiment, since the lid member 7 is composed of the same type of substrate as the substrate 4, the LED 3 and the metal terminals 5 and 6 are soldered to the substrate 4, and the lid member (another substrate) for the metal terminals 5 and 6. 7 can be simultaneously performed by reflow processing, and the production efficiency of the LED bulb 1 is increased.

  The LED bulb according to the present invention includes general lighting, chandelier lighting, residential lighting, office lighting, store lighting, exhibition lighting, street light lighting, guide light, signal, stage and studio lighting, advertising light, and security light. It is used for applications such as emergency lighting, flashlights, in-vehicle light bulbs for cars, row lights, medical lights, rotating lights (patlights), and game lighting.

DESCRIPTION OF SYMBOLS 1 LED bulb 2 Valve 2A Valve body 2B Valve dome 2a Valve lower end opening 3 LED
4 Substrate 5,6 Metal terminal 5a, 6a Metal terminal stopper 7 Lid member 8 Sealant r Inner diameter of valve dome t Thickness of valve x LED optical axis

Claims (4)

An LED, a substrate on which the LED is mounted, and one end electrically connected to the substrate in a sealed space in a constant-thickness bulb in which one end of the cylindrical body is sealed by a hollow hemispherical dome. In an LED bulb that accommodates a part of the connected metal terminal and that is drawn out of the bulb by penetrating the other end of the bulb through the other end sealing portion of the bulb,
An LED bulb characterized in that when the inner diameter of the dome portion of the bulb is r and the thickness is t, the light emitting point position on the optical axis of the LED is set to (1.6r + t) from the apex of the dome portion. .   The boundary portion between the dome portion and the main body portion on the inner surface of the bulb is arranged on a straight line passing through a point where the light emission intensity of the LED is 50% of the light emission intensity on the optical axis. The LED bulb according to 1.   3. The LED bulb according to claim 1, wherein a lid member into which the metal terminal is inserted is disposed in a sealed space in the bulb at a position separated from the substrate toward the other end sealing portion of the bulb. . 4. The LED bulb according to claim 3, wherein the lid member is made of the same type of substrate as the substrate.

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