JP2015099753A - Led light bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED light bulb capable of acquiring light distribution characteristic the same as that of an incandescent lamp by radiating light evenly in all directions without involving restraint on a mounting direction, and capable of preventing deterioration of a light amount and durability life of an LED by enhancing heat radiation properties.SOLUTION: An LED light bulb 1 is configured in which: LEDs 5 are mounted on a center part of a translucent substrate 4 in which a circuit pattern 8 is formed and circuit components 6 are mounted on both end parts respectively; heat sinks 7 for covering the circuit components 6 are arranged at both end parts of the translucent substrate 4 respectively; a base 2 is attached to each heat sink 7 respectively; and a cylindrical globe 3 for covering the translucent substrate 4 and the LEDs 5 mounted on it is laid between the bases 2.

Description

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

  For example, fuse-type incandescent bulbs that emit light from filaments have been used exclusively for vehicle room lamps. In recent years, LED bulbs that use low-power, high-brightness, and long-life LEDs as light sources have been used. Has been.

  For example, Patent Document 1 proposes an LED bulb 101 as shown in FIG. That is, FIG. 7 is a perspective view of the LED bulb proposed in Patent Document 1, and the illustrated LED bulb 101 has a plurality of LEDs 105 mounted on a substrate 104 and constitutes a main body portion with irradiation light from each LED 105. As a countermeasure against heat generated by the LED 105 by being diffused by the lens member 110, a heat radiating hole 110a is formed in the side wall of the lens member 110, or the substrate 104 is made of an aluminum material having high thermal conductivity.

JP 2011-230751 A

  By the way, an incandescent bulb using a filament does not have polarity, so it can be lit regardless of whether the right or left is fitted. However, in order to eliminate polarity in an LED bulb, the number of necessary circuit components increases, and the LED on the board When many circuit components are arranged on the mounting surface, the area of the light emitting portion is reduced. In order to solve this problem, if a configuration in which the circuit component is disposed on the back surface opposite to the light emitting surface of the substrate is employed, there arises a problem that the heat conduction path from the circuit component becomes long and the heat dissipation performance is deteriorated.

  In addition, when a non-transparent substrate 104 is used as in the LED bulb 101 proposed in Patent Document 1, light distribution on the back side cannot be obtained, and light emission with strong directivity different from that of an incandescent bulb is obtained. turn into. And when it is set as a non-polar LED bulb, it lights up regardless of which of the left and right sides is fitted, but it is necessary to attach the LED bulb so that the light emission direction of the LED is directed to the direction of light emission. There is also a problem that involves restrictions.

  The present invention has been made in view of the above problems, and the intended process is to obtain light distribution characteristics equivalent to an incandescent bulb by irradiating light uniformly in all directions without any restrictions on the mounting direction. It is possible to provide an LED light bulb that can increase heat dissipation and prevent a reduction in the light amount and durability of the LED.

  In order to achieve the above object, an LED bulb according to the first aspect of the present invention includes an LED mounted on a central portion of a light-transmitting substrate on which a circuit pattern is formed, and circuit components mounted on both ends. Covering heat sinks are disposed at both ends of the light guide substrate, and bases are respectively attached to the heat sinks, and a cylindrical glove covering the translucent substrate and the LEDs mounted thereon is interposed between the bases. It is constructed by erection.

  According to a second aspect of the present invention, in the first aspect of the present invention, cavities are formed on the light-transmitting substrate, and the LEDs are directly mounted in the cavities.

  The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the LED bulb is used as a vehicle-mounted room lamp.

  According to the first aspect of the present invention, since the LED is mounted on the translucent substrate, the light from the LED is transmitted through the translucent substrate and emitted in all directions, and the light is irradiated uniformly in all directions. Light distribution characteristics equivalent to incandescent bulbs can be obtained. Since the circuit components are arranged and arranged on both ends of the translucent substrate, a large light emitting area can be secured and a wide light emitting region can be obtained.

  In addition, circuit components for eliminating the polarity are arranged on both ends of the translucent board, and the heat sink is arranged so as to cover each circuit board, so the conduction path of the heat generated by the circuit parts to the heat sink is shortened. The heat is efficiently conducted to the heat sink, and the heat conducted to the heat sink is dissipated from the base to the surroundings. The heat generated by the LED is conducted from the translucent substrate through the heat sink to the base and dissipated from the base to the surroundings, so that the LED is efficiently cooled and its temperature rise is kept low. Decrease in light intensity and durability is prevented.

  Furthermore, as described above, since light is emitted uniformly from all directions from the LED bulb, the LED bulb is not restricted in its mounting direction and can be mounted in any direction, so that the mounting performance is good. Enhanced.

  According to the second aspect of the present invention, since the LED is directly mounted in the cavity formed on the translucent substrate, the heat generated by the LED is directly conducted to the translucent substrate, and finally from the base to the surroundings. The heat is effectively dissipated and the temperature rise of the LED is suppressed more effectively, and the luminous efficiency and the durability life are increased.

  According to the third aspect of the present invention, the necessary amount of light can be ensured by using the LED bulb according to the present invention as a vehicle-mounted room lamp.

It is a side view of the LED bulb which concerns on this invention. It is a front view of the translucent board | substrate with which LED of LED bulb concerning this invention and circuit components were mounted. It is a front view which shows the state which fitted and fixed the longitudinal direction both ends of the translucent board | substrate of the LED bulb which concerns on this invention to the heat sink. It is a perspective view which shows the state which fitted and fixed the longitudinal direction both ends of the translucent board | substrate of the LED bulb which concerns on this invention to the heat sink. It is a side view which shows the state which removed the glove | globe of the LED bulb which concerns on this invention. It is the sectional view on the AA line of FIG. It is a perspective 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 side view of an LED bulb according to the present invention, FIG. 2 is a front view of a translucent substrate on which the LED and circuit components of the LED bulb are mounted, and FIG. 3 is both longitudinal ends of the translucent substrate of the LED bulb. FIG. 4 is a perspective view, FIG. 5 is a side view showing a state in which the globe of the LED bulb is removed, and FIG. 6 is a cross-sectional view taken along line AA in FIG. It is.

  As shown in FIG. 1, an LED bulb 1 according to the present invention is a sealed space formed by a pair of left and right metal caps 2 having a bottomed cylindrical shape and a cylindrical globe 3 installed between two cap portions. 2, a rectangular flat plate-like light-transmitting substrate 4 shown in FIG. 2, six LEDs 5 directly mounted on the light-transmitting substrate 4, and a plurality of the light-transmitting substrates 4 arranged at both right and left ends. The circuit component 6 and the translucent substrate 4 are configured to accommodate a pair of heat sinks (see FIGS. 3 and 4) disposed so as to cover the circuit substrate 4 at both left and right ends.

  The translucent substrate 4 is made of transparent glass, ceramics, sapphire or the like, and a circular cavity is formed at the center of one surface (front surface) of the translucent substrate 4 as shown in FIG. 4a is formed. And in the cavity 4a of this translucent board | substrate 4, six said LED5 is arrange | positioned by equiangular pitch on the same periphery, and these LED5 is translucent by heat conductive adhesives, such as a die bond. It is directly bonded to the surface of the substrate 4.

  Further, a circuit pattern 8 made of Au, Ag, Cu or the like is formed on the translucent substrate 4, and a plurality of the circuit components 6 are electrically connected to the circuit pattern 8. The electrode extraction part 8a arrange | positioned at the right-and-left both ends of the translucent board | substrate 4 is formed in this edge part (refer FIG. 2). Here, when the electrode extraction part 8a is made of a metal other than Au, the surface of the electrode extraction part 8a is Au plated. Here, the circuit pattern 8 is formed by sputtering, printing, attaching an FR4 substrate, or the like. Further, the plurality of circuit components 6 mounted on the left and right ends of the translucent substrate 4 are for configuring a circuit for eliminating the polarity of the LED bulb 1.

  And the circuit pattern 8 and each LED5 which were formed in the translucent board | substrate 4 are electrically connected by wire bonding. The electrical connection between the circuit pattern 8 and each LED 5 may be performed by FC (flip chip).

  As shown in FIGS. 3 and 4, the heat sink 7 integrally formed in a cylindrical block shape with Al having high thermal conductivity covers the circuit component 6 at both the left and right ends of the translucent substrate 4. Is arranged. Specifically, as shown in FIG. 6, a rectangular fitting hole 7a is formed at the center of each heat sink 7, and the end of the translucent substrate 5 is connected to the fitting part 7a as a circuit component. Each heat sink 7 is fixed to the end of the translucent substrate 4 by being fitted together with 6. At this time, the left and right end portions of the translucent substrate 4 are in direct contact with the heat sink 7 to be thermally conductive.

  When the translucent substrate 4 and the heat sink 7 are combined and integrated as described above, the base 2 formed into a bottomed cylindrical shape with conductive metal is formed on each of the left and right sides as shown in FIGS. A fuse-type LED bulb 1 shown in FIG. 1 is obtained by installing the globe 3 between the caps 2 so as to be fitted and fixed to the outer periphery of the heat sink 7. As shown in FIG. 6, lead wires 9 are led out from the left and right electrode extraction portions 8 a (see FIG. 2) formed in the circuit pattern 8 of the translucent substrate 4. Are electrically connected to the bottom surface of each base 2 by soldering or the like.

  When the base 2 of the LED bulb 1 configured as described above is fitted into a socket (not shown) and current is supplied to the LED bulb 1 from the power source (not shown) via the socket, the current is supplied from the lead wire 10. Since each LED 5 is supplied via the circuit pattern 8, each LED 5 is activated to emit light. Here, as an in-vehicle room lamp, a current of about 120 mA is passed in order to satisfy a necessary light quantity.

  Thus, in the LED bulb 1 according to the present embodiment, since the plurality of LEDs 5 are mounted on the translucent substrate 4, the light from each LED 5 is transmitted through the translucent substrate 4 toward almost all directions. The light can be emitted and irradiated uniformly in all directions. For this reason, according to this LED bulb 1, the light distribution characteristic equivalent to an incandescent bulb is obtained. And in this Embodiment, since the circuit component 6 for eliminating the polarity of the said LED bulb 1 was distributed and arrange | positioned at the both ends of the translucent board | substrate 4, a large light emission area is ensured and a wide light emission area | region is obtained. Can do.

  Further, in the LED bulb 1 according to the present invention, the circuit components 6 for eliminating the polarity are arranged separately on both ends of the translucent substrate 4, and the heat sink 7 is arranged so as to cover each circuit component 6. The conduction path of the heat generated by the component 6 to the heat sink 7 is shortened, and the heat generated by the LED 5 is efficiently conducted to the heat sink 7 and is conducted to the heat sink 7 as indicated by arrows in FIG. Is radiated from the base 2 to the surroundings. For this reason, each LED5 is cooled efficiently, the temperature rise is suppressed low, and the fall of the light quantity and durable life of this LED5 is prevented. In particular, in the present embodiment, since the LED 5 is directly mounted in the cavity 4a formed in the translucent substrate 4, the heat generated by the LED 5 is directly conducted to the translucent substrate 4, and finally the base 2 The heat is effectively radiated from the surroundings to the surroundings, whereby the temperature rise of the LED 5 is further effectively suppressed, and the light emission efficiency and the durability life are increased.

  Furthermore, as described above, since the LED bulb 1 is uniformly irradiated with light in all directions, the LED bulb 1 is not limited by its installation direction and can be installed in any direction. Sexuality is enhanced.

DESCRIPTION OF SYMBOLS 1 LED bulb 2 Base 3 Globe 4 Translucent substrate 4a Cavity of translucent substrate 5 LED
6 Circuit component 7 Heat sink 7a Heat sink fitting hole 8 Circuit pattern 8a Circuit pattern electrode lead-out 9 Lead wire

Claims (3)

  An LED is mounted on the center of the translucent substrate on which the circuit pattern is formed, circuit components are mounted on both ends, and heat sinks covering the circuit components are disposed on both ends of the light guide substrate, respectively. An LED light bulb comprising: a base globe, and a cylindrical glove that covers the translucent substrate and the LED mounted on the base plate, and is constructed between the bases.   2. The LED bulb according to claim 1, wherein a cavity is formed on the translucent substrate, and the LED is directly mounted in the cavity. The LED bulb according to claim 1 or 2, wherein the LED bulb is used as a vehicle-mounted room lamp. .

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