JP2007012821A - Led bulb with base - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED bulb with a base which uses an LED as a light emitting source and is easily compatible with such a bulb with a base that is comprised of another light emitting source at nearly less investigation cost, and which is compact and has less unevenness of luminance and no polarity. <P>SOLUTION: An LED mounting substrate wherein a plurality of LEDs 8a-8f are three-dimensionally arranged at high density is joined with a circuit part mounting substrate wherein circuit parts such as a rectifier diode 9, a resistance 10, etc. are mounted, and they are both arranged within a space 6 formed by a housing 4 and a lens 5. The housing 4 is attached to a base part 3 which is used to a halogen lamp or the like, thereby constituting an LED bulb with a base. The lens 5 is arranged to cover the LEDs 8a-8f, and an opening 15 provided above the LEDs 8a-8f is formed of a convex curve that the sectional shape of an inner circumferential surface 16 is open toward the outgoing direction of light to the optical axis X of the LED bulb with a base. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an LED bulb with a base, and more particularly, to an LED bulb with a base provided with a base used for a bulb with a base that uses a light emitting source other than an LED as a light source.

  A base-equipped LED bulb using an LED as a light emitting source has been proposed by using a base (base) used in a conventional incandescent bulb, halogen bulb, HID bulb or the like. For example, as shown in FIG. 5, an LED mounting board in which LEDs 51 a and 51 b are mounted on both surfaces of a circuit board 50 is disposed in a sealed space composed of a base 52, a transparent case 53, and a transparent upper lid 54. The LED bulb 55 with a base using an LED as a light source instead of the conventional tungsten filament is realized.

  In this case, the directions of the LEDs 51 a and 51 b mounted on both surfaces of the circuit board 50 are different depending on each surface side of the circuit board 50. Specifically, the LED 51a mounted on the upper surface of the circuit board 50 (the surface facing the transparent upper lid 54) faces the main light emission surface in front (irradiation direction) of the LED bulb with cap 55, and the lower surface of the circuit board 50. The LED 51b mounted on the (surface facing the base 52) side has the main light emitting surface directed to the side of the LED bulb 55 with base (direction perpendicular to the irradiation direction).

  Then, the light emitted from the LED 51a mounted on the upper surface side of the circuit board 50 is guided through the upper transparent upper lid 54 and emitted toward the front of the LED bulb with cap 55, and is emitted to the lower surface side of the circuit board 50. The light emitted from the mounted LED 51b is guided through the side transparent case 53 and emitted toward the side of the LED bulb 55 with the cap.

  Therefore, when the lamp body is configured by attaching the LED bulb with the cap with the above structure to the reflector so as to surround the LED bulb with the cap, the light emitted from the LED bulb with the cap in the lateral direction is reflected by the reflector. Is directed to the front of the LED bulb with a cap, and is emitted to the outside as irradiation light of the LED bulb with a cap. That is, the light emitted from the LED bulb with the cap is effectively used as the irradiation light, and a lamp body with high light utilization efficiency can be realized.

In addition, it is used for a bulb that uses a tungsten filament as a light source for a base that requires both an electrode for introducing power supplied from the outside into the LED bulb and a socket for mounting the LED bulb. The base is used as it is. Therefore, in order to realize an LED bulb with a base that is compatible with a conventional bulb with a base, since the conventional base is shared, there is no new investment cost, and the advantage of the LED light source can be easily obtained. (For example, refer to Patent Document 1).
Registered Utility Model No. 3106557

  By the way, in the LED bulb with a base having the above configuration, the LED is placed on the lower surface side of the circuit board so that the LED light is directed to the reflector surrounding the LED bulb with the base when the LED bulb with the base is mounted on the reflector. The LED is mounted with the main light exit surface facing the side of the LED bulb with cap.

  For this reason, in the LED mounting substrate, the LEDs are mounted on both sides of the circuit board, which increases the number of mounted LEDs and increases the number of mounting steps, resulting in a cost increase.

  In addition, the light emitted from the LED has directivity, and the LED light emitted from the LED radially mounted on the lower surface side of the circuit board and reaching the reflector has no continuity, and the reflector is an LED bulb with a cap. Irradiation light (combined light of direct light from the LED and reflected light reflected by the reflector) emitted from the lamp body to which the lamp is attached contains uneven brightness.

  In addition, in order to obtain a predetermined amount of light using an LED with a small amount of emitted light per element as a light source, it is necessary to increase the number of LEDs mounted. May not be used as a case.

  Furthermore, the conventional LED bulb with a cap does not include circuit components, and naturally, no means is provided to turn on the LED regardless of the polarity of the applied voltage, unlike a rectifier circuit. That is, since the conventional LED bulb with a cap has polarity, it may be possible that the LED bulb with the cap does not light up depending on the vehicle type even if it is attached to the vehicle lamp.

  Therefore, the present invention was devised in view of the above problems, and the object of the present invention is to provide another light emitting source with little investment cost in an LED bulb with a base having an LED as a light emitting source. It is to realize an LED bulb with a base that is easy to be interchanged with a valve with a base configured as follows, is small in size, has little luminance unevenness, and has no polarity.

  In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention includes an LED mounting board in which a plurality of LEDs are mounted on a board in a space formed by a housing and a lens, and a circuit on the board. An LED bulb unit portion on which a circuit component mounting board on which components are mounted is disposed is attached to a base via the housing.

  The invention described in claim 2 of the present invention is characterized in that, in claim 1, the LED mounting substrate has LEDs arranged at at least two different heights.

  The invention described in claim 3 of the present invention is characterized in that, in any one of claims 1 and 2, the circuit component mounting substrate is provided with at least a rectifier circuit using a diode. is there.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the LED mounting board and the circuit component mounting board are the leads of the LED and / or the circuit component. It is fastened by a lead and is electrically connected between both mounting boards.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the lens is disposed so as to cover the LED mounting substrate, and is positioned above the LED of the lens. An opening is provided in the portion to be performed.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the opening of the lens is such that a cross section of the inner peripheral surface of the opening is directed in the light emitting direction with respect to the optical axis of the LED bulb. It is one selected from a straight line, a convex curve, and a concave curve.

  The invention described in claim 7 of the present invention is characterized in that, in any one of claims 1 to 6, the base uses an HB4 type or an H11 type.

  The LED bulb with a cap of the present invention is a housing in which an LED mounting board on which a plurality of LEDs are arranged three-dimensionally and at a high density and a circuit component mounting board on which circuit parts such as rectifier diodes and resistors are mounted are fastened. An LED bulb with a base is configured by placing the housing in a space formed by a lens and a housing, and attaching the housing to a base used in a halogen lamp. The lens is arranged so as to cover the LED mounting substrate, and the cross-sectional shape of the inner peripheral surface of the opening portion of the lens provided above the LED is directed toward the light emission direction with respect to the optical axis X of the LED bulb with cap. It was an open convex curve.

  As a result, an LED bulb with a cap that can be optically and electrically compatible with a halogen bulb can be easily realized with little investment cost.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 (the same reference numerals are given to the same parts). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  FIG. 1 is a cross-sectional view showing an embodiment of an LED bulb with a cap of the present invention. The LED bulb with cap 1 of the present embodiment is composed of an LED bulb unit portion 2 and a cap portion 3 (in this embodiment, an HB4 type cap is used).

  The LED bulb unit 2 has a housing 6 and a lens 5 fitted to each other to form a space 6 therein, and the space 6 is rectified into an LED mounting board in which LEDs 8a to 8f are mounted on a circuit board 7a and a board 7b. A circuit component mounting board on which circuit components such as a bridge 9 and a resistor 10 are mounted is disposed. Then, the housing 4 of the LED bulb unit 2 is inserted into the opening space 11 of the base 3 and press-fitted or bonded, and the LED bulb unit 2 is fixed to the base 3. In addition, a power supply line 12 for supplying power from the outside to the LED mounting board and the circuit component mounting board is connected to one end of the power supply line 12 to the circuit board 7 b and the other end is in the base part 3. It is connected to a provided power supply terminal (not shown).

  Therefore, the components of the LED bulb with cap will be described in detail. First, as shown in FIG. 2, the LED mounting board 13 has six LEDs 8 a to 8 f mounted on a substantially circular circuit board 7 a in the same direction.

  The circuit board 7a used here can be based on a resin such as a glass epoxy board or a paper phenol board, or can be based on a ceramic. The circuit configuration of the board, the usage environment to which the board is exposed, An optimal member is appropriately selected in consideration of the characteristics and cost of the substrate.

  Further, the LEDs 8a to 8f are referred to as a cannonball type, and a general structure is such that a leading end portion of at least one lead frame among a plurality of lead frames arranged in a row and in parallel is electrically connected. An LED chip serving as a light emitting source is placed via a conductive member, and a lower electrode of the LED chip and a lead frame on which the LED chip is placed are electrically connected. On the other hand, the upper electrode of the LED chip is connected to another lead frame via a bonding wire, and the upper electrode of the LED chip and the lead frame are electrically connected. And the front-end | tip part of the lead frame containing an LED chip is resin-sealed by the translucent resin in a bullet shape, and the spherical or aspherical lens surface by sealing resin is formed above the LED chip.

  Specifically, the LEDs 8a to 8f used in the present embodiment are constituted by a pair of lead frames consisting of only a lead frame based on the structure of the above-mentioned general bullet-type LED. The number of lead frames constituting the LED is appropriately determined in consideration of the number of LED chips used based on optical characteristics such as the brightness and emission color of the LEDs, the element structure of the LED chips, and the like.

  In this embodiment, a bullet-type LED is used as a light source. However, the LED is not limited to this, and an LED having another shape such as a surface-mounted LED or another mounting method may be used. Is possible.

  The six LEDs 8a to 8f mounted on the circuit board 7a are arranged at substantially equal intervals on substantially the same circle centering on the LED 8a at the center so as to surround the LED 8a to 8f mounted on the circuit board 7a. The light distribution of the emitted light emitted from the LED bulb with the cap by these six LEDs 8a to 8f is continuously formed in a substantially point-symmetric manner around the optical axis X of the LED bulb with the cap. Therefore, the illumination light has little luminance variation, and light distribution control can be easily performed when an LED bulb with a cap is incorporated in a lamp.

  Furthermore, one LED 8a in the central portion is arranged so as to be positioned above the five surrounding LEDs 8b to 8f, whereby light emitted from the central LED 8a is transmitted to the surrounding LEDs 8b to 8f. It is utilized as light emitted from the LED bulb with cap 1 without being obstructed, and the light utilization efficiency is enhanced.

  When the LED 8a at the center is an LED having a flange 22, it can be densified by shifting it at least upward by the height of the flange 22 with respect to the flanges 22 of the other LEDs 8b to 8f. In the present embodiment, the LEDs 8b to 8f all have the same height position of the flange 22.

  Further, the LEDs 8a to 8f are three-dimensionally arranged, so that the mounting density of the LEDs 8a to 8f is increased, the amount of light emitted from the LEDs 8a to 8f is increased per unit area, and the LED mounting board can be downsized. Accordingly, the outer shape of the lens 5 (the outer shape of the LED lamp unit portion), which will be described later, can be made substantially the same as the outer shape of the annular rib 19 of the base portion 3, and the possibility of compatibility with a conventional bulb with a base is achieved. Will increase.

  The LED mounting board 13 having such a configuration and the circuit component mounting board on which at least the rectifying bridge 9 and the resistor 10 are mounted as shown in FIG. 1 use the leads of the LEDs 8a to 8f and the leads of the resistor 10 as they are. At the same time, both substrates are electrically connected. The rectifier bridge 9 is made non-polar so that the LEDs 8a to 8f are lit regardless of the polarity of the voltage applied to the LED bulb with cap, and the resistor 10 serves to control the current flowing through the LEDs 8a to 8f.

  The LED mounting substrate and the circuit component mounting substrate integrated in a T-shape are arranged in a space formed by the housing and the lens, with the LED mounting substrate in contact with the end surface of the annular side wall of the housing. Yes.

  The lens 5 disposed so as to cover the LED mounting substrate is formed of a translucent member, has a shape having an annular side wall 14 in which an upper central portion of the LEDs 8a to 8f is opened, and an inner peripheral surface of the opening 15 The cross-sectional shape of 16 consists of the convex curve opened toward the light emission direction of LED8a-8f with respect to the optical axis X of a LED bulb with a nozzle | cap | die.

  The opening 15 of the lens 5 also has a function of releasing the heat generated from the LEDs 8a to 8f to the outside. Therefore, the temperature rise of the LEDs 8a to 8f is suppressed, so that a certain light emission efficiency is secured, and the LEDs 8a to 8f. The decrease in the amount of emitted light due to the heat generation is suppressed.

  The housing 4 integrated with the lens 5 is formed of a non-translucent resin, and has a space inside an annular side wall 17 having one end opened and the other end closed.

  The LED bulb unit 2 in which the LED mounting board and the circuit component mounting board fastened in a T-shape are disposed in a space 6 formed by the integrated housing 4 and lens 5 is a closed opening of the housing 4. The outer peripheral surface 18 of the part is press-fitted or bonded to the inner peripheral surface 20 of the annular rib 19 of the base part 3 and fixed to the base part 3.

  The other end of the power supply line 12 having one end connected to the circuit component mounting board passes through the closed portion of the housing 4 and is introduced into the base 3, and a power supply terminal (not shown) provided on the base 3. ), And the electric power supplied from the outside is led to the LED bulb with cap.

  Note that the LED bulb unit has a 5 mm diameter bullet type LED mounted on the circuit board, assuming that the H11 halogen lamp is replaced and the brightness is secured, and the LED bulb unit has an outer diameter of 19 mm or less. Set.

  Here, the optical system of the LED bulb with cap of this embodiment will be described with reference to FIG. Many of the lights h to j emitted from the LED 8a located in the central portion of the LED mounting substrate are not attenuated through the opening 15 of the lens 5 disposed in front of the LED 8a. To be released.

  In addition, the LEDs 8b to 8f arranged so as to surround the LED 8a located at the center of the LED mounting substrate have a part of the light k emitted from the LEDs 8b to 8f directly attached to the base via the opening 15 of the lens 5. A part of the light l enters the lens 5 and is guided through the lens 5 to be emitted to the outside, and a part of the light m and n enters the lens 5 to be emitted from the LED bulb. 5 is guided to reach the inner peripheral surface 16 of the opening 15, reflected (totally reflected) by the inner peripheral surface 16, and discharged to the side or oblique side of the LED bulb with cap.

  At this time, the light emitted from the LEDs 8 a to 8 f is reflected on the inner peripheral surface 16 of the opening 15 of the lens 5 by entering the lens 5 and the amount of light directly emitted from the opening 15 of the lens 5. Thus, the amount of light emitted to the outside toward the side or oblique side of the LED bulb with cap is set to be a ratio of about 1: 1.

  The ratio and the light distribution characteristics of the light emitted from the LED bulb with the base are determined by various factors, but the shape of the inner peripheral surface of the lens opening is also one factor. In this embodiment, the shape of the inner peripheral surface is a convex curve in which the cross section of the inner peripheral surface is open toward the light emission direction with respect to the optical axis of the LED bulb with cap. However, the shape of the inner peripheral surface is not limited to this, and a concave curve or straight line that is open toward the light emission direction with respect to the optical axis of the LED bulb with the cap is possible, and desired light distribution characteristics, etc. The optimum shape is appropriately adopted in consideration of the above.

  When an LED bulb with a base having such an optical system is incorporated in a reflector, as shown in FIG. 4, light m and n emitted toward the side or oblique side of the LED bulb with a base are LEDs with a base. The reflector 21 arranged so as to surround the bulb reaches the reflector 21, is reflected by the reflector 21, and is emitted to the outside as irradiation light of the LED bulb with cap. In particular, the LED 8a disposed in the central portion of the LED mounting substrate is disposed so as to be positioned above the surrounding LEDs 8b to 8f, whereby the light emitted from the central LED 8a is surrounded by the surrounding LEDs 8b to 8f. Therefore, it is used as irradiation light of the lamp without being obstructed by the light, and the light use efficiency is improved.

  As described above, the LED bulb with cap of the present invention uses a directional LED as a light source, and the LED bulb unit is configured by three-dimensionally arranging the LEDs on a circuit board in high density. As a result, by attaching the miniaturized LED bulb unit to the base used in the conventional HID lamp, it becomes possible to easily realize the LED bulb with the base compatible with the conventional HID lamp. It was.

  And by replacing the HID lamp with an LED bulb with a cap, LED such as clear light based on the emission spectrum of LED, mixed light of a plurality of LED lights, mixed light of LED light and excitation light by a phosphor, etc. In addition to emitting light of a specific color tone, it is possible to reduce the energy of the light emitting source.

  In addition, the LED mounted on the circuit board is mounted only on one side of the circuit board, and instead of mounting the LED sideways, the LED light is laterally or obliquely utilized using the total reflection surface of the lens. I turned it. As a result, it is possible to reduce the number of LEDs to be mounted and reduce the number of mounting steps, thereby contributing to a reduction in manufacturing cost and at the same time providing a light source with good light distribution characteristics.

  The base is not limited to the HB4 type employed in the present embodiment, but is appropriately selected from other types of bases such as the H11 type, G18 type, and S25 type based on the use and specifications of the LED bulb with the base. Is done.

It is sectional drawing of embodiment concerning the LED bulb with a nozzle | cap | die of this invention. Similarly, it is a perspective view of the LED mounting substrate which comprises embodiment concerning the LED bulb with a nozzle | cap | die of this invention. Similarly, it is explanatory drawing which shows the optical system concerning the LED bulb with a nozzle | cap | die of this invention. Similarly, it is a fragmentary sectional view which shows the state which attached the LED bulb with a nozzle | cap | die of this invention to the reflector. It is a perspective view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED valve with a cap 2 LED valve unit part 3 Base part 4 Housing 5 Lens 6 Space 7a, 7b Circuit board 8a-8f LED
DESCRIPTION OF SYMBOLS 9 Rectification bridge 10 Resistance 11 Open space 12 Feeding line 13 LED mounting board 14 Annular side wall 15 Opening part 16 Inner peripheral surface 17 Annular side wall 18 Outer peripheral surface 19 Annular rib 20 Inner peripheral surface 21 Reflector 22 Flange

Claims (7)

  In the space formed by the housing and the lens, the LED bulb unit portion in which the LED mounting board in which a plurality of LEDs are mounted on the board and the circuit component mounting board in which the circuit components are mounted on the board is disposed in the housing. An LED bulb with a cap, which is attached to the cap through a cap.   2. The LED bulb with a base according to claim 1, wherein the LED mounting substrate has LEDs arranged at two or more different heights.   3. The LED bulb with a cap according to claim 1, wherein the circuit component mounting board is provided with at least a rectifier circuit using a diode. 4.   2. The LED mounting substrate and the circuit component mounting substrate are fastened by leads of the LED and / or leads of the circuit component, and electrical conduction between the mounting substrates is achieved. The LED bulb with a cap according to any one of?   The said lens is arrange | positioned so that the said LED mounting substrate may be covered, and the opening part is provided in the part located above the said LED of this lens, The any one of Claims 1-4 characterized by the above-mentioned. LED bulb with cap.   The opening of the lens was selected from among a straight line, a convex curve, and a concave curve in which the cross section of the inner peripheral surface of the opening was open toward the light emission direction with respect to the optical axis of the LED bulb. 6. The LED bulb with a cap according to claim 5, wherein the number is one. The said base uses HB4 type or H11 type, The LED bulb with a base of any one of Claims 1-6 characterized by the above-mentioned.

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