JP2002208301A - Solid-state light source device - Google Patents

Abstract

(57) [Summary] The present invention has a light distribution characteristic suitable for use in general lighting,
It is an object of the present invention to provide a solid-state light source device having a small external appearance and a relatively small mass. The apparatus includes a valve part (2a) and a neck part (2b),
Hollow substrate 2 with neck 2b mounted on screw cap 1
Are arranged on at least the outer surface of the bulb main part 2a1, and the bottom surface is substantially in contact with the outer surface of the hollow base 2 so that a large number of chip-shaped white light emitting type light emitting diodes 13 'are arranged. Circuit means 4 'are provided for wiring as required and connecting to the base. The circuit means 4 ′ includes a first printed wiring board 4 a ′ formed on the outer surface of the hollow base 2, and the light emitting diode 13 ′ can be surface-mounted. Further, if necessary, the light-transmitting insulating coating 5 can be applied from above the light emitting diode 13 '.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solid-state light source device using a light emitting diode.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 10-83709 discloses a rectangular tubular side emission section, a front emission section provided in front of the side emission section, and a rear side of the side emission section. A light-emitting unit having a bayonet-type base is disclosed. The purpose of this light emitting unit is to substitute an incandescent light bulb for a signal light such as a traffic light. The signal light unit generates red, yellow, or blue (green) signal light for each light emitting unit. And it is configured by a special arrangement so as to efficiently project light forward in combination with a reflector. That is, the light emitting diode disposed on the side light emitting section emits light only in a direction perpendicular to the axis of the reflecting mirror. The light emitting diode disposed in the front light emitting unit emits light only in the axial direction of the reflecting mirror. Furthermore, the light emitting diode has a lens shape and a narrow light distribution characteristic.

[0003]

Even if it is conceivable to divert the above light emitting unit for general lighting,
In that case, there are the following problems.

[0004] 1. Problems of Light Distribution Characteristics An incandescent lamp for general lighting is a glass bulb having a ball shape, that is, a G shape in which a light diffusion film is formed on the inner surface of a glass bulb having a spherical bulb portion. , The horizontal light distribution characteristic is a perfect circle, and the vertical light distribution characteristic is
The luminous intensity becomes 0 at 0 °, but is almost circular in many other angle ranges. For this reason, it is suitable for various lighting fixtures for general lighting. An incandescent lamp having a PS-type glass bulb, which is most frequently used for general lighting, also has a light distribution characteristic similar to that of the G-type.

On the other hand, in the prior art, due to the configuration of the light emitting section described above, the vertical light distribution characteristic is peculiar in that it protrudes sharply in three directions of 90 ° left and right and 0 °. However, the light distribution characteristics desired as a lighting fixture cannot be obtained even when the lighting apparatus is used for various lighting fixtures. This means that even if the prior art is used for general lighting, it cannot be used for the purpose of providing comfortable lighting.

[0006] 2. Problem of too heavy weight [0006] Since a lens-shaped light emitting diode is used, it becomes significantly heavier as a whole and becomes difficult to handle as compared with an incandescent lamp for general lighting.

[0007] 3. A problem that the external appearance is uncomfortable. The basic shape is a rectangular tube, and the lens-shaped light emitting diode is exposed.
The feeling of strangeness is too great for general lighting.

[0008] The problem that the lamp socket of the general lighting bulb cannot be mounted on the lamp socket. The base used in the conventional technology is a bayonet type, whereas the base of the general lighting bulb is an E26 type screw base. Not compatible with lamp sockets for lighting bulbs.

An object of the present invention is to provide a solid-state light source device having a light distribution characteristic suitable for use in general illumination.

It is another object of the present invention to provide a solid-state light source device with less discomfort in appearance.

Still another object of the present invention is to provide a solid-state light source device having a relatively small mass.

[0012]

According to the first aspect of the present invention, there is provided a solid-state light source device comprising: a screw base; a hollow base having a bulb portion and a neck portion, wherein the neck portion is mounted on the screw base;
A large number of chip-shaped light-emitting diodes, each of which is a white light-emitting type, which is dispersed at least on the outer surface of at least the main part of the bulb portion of the hollow base, and whose bottom is disposed substantially in contact with the hollow base; Circuit means for wiring to the base and connecting to the base.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

<Screw base> The screw base is E26
It is preferable to use a screw cap of shape E17 or E17. Since these bases are used for incandescent lamps for general lighting, they can be used by attaching them to their lamp sockets. The above screw base is generally 100V or 12V.
It is commonly used to connect to a 0V low voltage commercial AC power supply.

<Hollow Substrate> The hollow substrate has a valve portion and a neck portion.

The bulb portion is preferably shaped like a glass bulb of an incandescent lamp for general lighting or a globe of a bulb-shaped fluorescent lamp or a shape and size similar thereto, but if necessary, for example, like a soccer ball. It may be a polyhedral shape in which hexagonal flat portions are connected.
In the case of the polyhedral shape, it is preferable that the shape and the size be substantially inscribed in the contour shape of the glass bulb of the incandescent lamp for general lighting or the globe of the bulb-shaped fluorescent lamp. As a shape of a glass bulb in an incandescent light bulb for general lighting, a G type and a PS type are mainly used. The shape of the globe of the bulb-type fluorescent lamp is G
Shapes, A and T shapes are mainly used. These shapes are well known in the general illumination light source industry.
Further, the main part of the valve portion extends from a tip of the valve to a portion forming 135 ° around the axis from a position of a half of the length along the axial direction of the hollow base at a portion exposed from the base. That. In general lighting, this is defined because light emitted from the above-defined main part of the bulb part is mainly used effectively, in other words, efficient lighting can be performed. Further, the main part of the valve part of the hollow base and other parts may be formed so as to be separable.

The neck portion is a portion connecting the hollow base and the screw base, and is therefore thinner than the valve portion. The two ends can be connected by inserting the tip of the neck into the inside of the screw base and caulking or bonding the screw base.

The hollow substrate may be formed using an insulating material such as polybutylene terephthalate (PBT) resin, polycarbonate resin, a printed wiring board material such as synthetic resin such as glass fiber reinforced epoxy resin, ceramics, glass, or the like. it can. The color of the outer surface of the hollow substrate may be any of a material-specific color and a coating color,
It may be arbitrarily selected as desired. For example, a white color or an external surface can be mirror-finished to provide reflectivity, or a skeleton specification can be used which is transparent so that the inside can be seen through.

Further, printed wiring and / or lead wire insertion holes are formed in the hollow base according to the mode of connecting the light emitting diode to the circuit means. These will be described later.

Further, the hollow substrate can be formed by assembling a plurality of divided parts as necessary in order to facilitate its molding, assembly, formation of printed wiring or mounting of a light emitting diode. Division can be appropriately configured such as vertical division or horizontal division. Known assembling means such as bonding and fitting can be appropriately adopted for the assembling.

Further, a heat radiating means for radiating the heat generated inside to the outside, for example, a heat radiating hole, a heat radiating fin, or the like can be provided at an appropriate position of the hollow base.

<Regarding Light-Emitting Diode> A light-emitting diode generally comprises a light-emitting portion and a lead portion.

In the present invention, the light-emitting portion is roughly classified into a lens shape and a chip shape. The “lens shape” refers to a lens in which the height of the light-emitting portion is larger than either the width or the depth, and most of the light-emitting portion is entirely or in many parts in order to control the light distribution of the light-emitting diode as desired. Are formed so as to exhibit a lens action. On the other hand, the “chip type” refers to a light emitting portion having a thin shape and a height equal to or less than the width or the depth, whichever is greater. The “width” is a dimension of the light emitting unit in the direction of the lead portion at a position where the lead portion can be seen left and right. Further, the “depth” is a dimension of a portion orthogonal to the width in the plane of the light emitting unit forming the thin shape.

The structure of the light emitting portion is generally different between the lens shape and the chip shape, but this is not critical. The lens shape often includes a lead frame, a light emitting diode chip bonded to the lead frame, a bonding wire, and a light-transmitting resin seal portion in which these components are embedded and molded into a lens shape. On the other hand, the chip type is generally a ceramic substrate,
It can be composed of a lead frame provided on a ceramic substrate, a light emitting diode chip bonded to the lead frame, a bonding wire, and a light-transmitting resin seal portion in which these components are embedded and molded on the ceramic substrate. Also, a pair of conductive films formed on a ceramic substrate, a light emitting diode chip disposed on one conductive film, a bonding wire connecting between the light emitting diode chip and the other conductive film, and a ceramic substrate formed by embedding these components. It can also be constituted by a translucent resin seal formed above.

Next, the lead portion is an external connection portion derived from the light emitting diode chip. The lead portion is a thin metal wire, an elongated lead frame, or a conductive film formed mainly on the bottom surface of the ceramic substrate of the chip type light emitting portion. It consists of a tongue-shaped lead frame that protrudes in the direction. The lens type has a configuration in which a pair of metal wires or a lead frame extends in parallel in the axial direction from the bottom surface of the light emitting unit. On the other hand, in the chip type, an elongated metal wire, an elongated lead frame or a tongue-shaped lead frame extends laterally from the light emitting portion, or a conductive film is attached to the bottom and / or side surfaces of the ceramic substrate. There are many configurations. However, in the present invention, the configuration of the lead portion is not particularly limited.

The light emission color of the light emitting diode is generally divided into red, orange, yellow, green, blue and white.
The white type has a configuration in which a blue light emitting diode chip and a yellow light emitting phosphor are combined, and a configuration in which light emitting diode chips of three primary colors or two colors are collected to emit white light. May be.

The light emitting diode used in the present invention comprises:
The light emitting part is chip type and its width dimension is 4mm
The following are mentioned, and the emission color is a white emission type.

Further, many of the light emitting diodes are dispersed on at least the outer surface of at least the main part of the bulb portion of the hollow base, and the bottom surface of the light emitting portion is disposed substantially in contact with the outer surface of the hollow base. In addition, "a large number of light emitting diodes"
It means at least 50 or more, preferably 150 or more. "Dispersed" is meant to include both uniformly dispersed and non-uniformly dispersed embodiments. In the case of non-uniformity, the light distribution characteristic can be corrected as desired by, for example, relatively increasing the arrangement density on the distal end side of the bulb portion and disposing the neck side relatively sparsely. "Almost contact" means that it is as if it appears to be in contact, and it may be slightly floating.

Furthermore, when a part of the lead portion of the light emitting diode or a charged portion such as a printed board and solder is exposed on the outer surface of the hollow base, only the charged portion is insulated or the entire hollow base is covered. If the light emitting diode is insulated from above with a translucent synthetic resin, the charged portion is concealed.

Furthermore, the color temperature of light emission of the light emitting diode is allowed to be in the range of 2000 to 10000K.

<Regarding the Circuit Connecting Means> The circuit connecting means is a means for connecting the light emitting diode and the base as required to light the light emitting diode. Includes diode wiring means.

First, the driving method will be described. The light emitting diode emits light, that is, lights up when a current, that is, a forward current flows in the forward direction. In order to light a light emitting diode, there are an AC drive method in which an AC current flows directly through two or more light emitting diodes, a DC drive method in which a DC current flows, and a pulse drive method in which a pulse current flows. In the present invention, any of them may be used.

In the AC driving method, a light emitting diode in which a forward current flows when the AC voltage has a positive half wave and a light emitting diode in which a forward current flows when the AC voltage has a negative half wave, ie, a pair of light emitting diodes is anti-parallel. Just connect it to. When a plurality of light emitting diodes are connected in series in order to adapt to a given AC voltage or to obtain a desired amount of light, a plurality of light emitting diodes connected in series may be connected in anti-parallel, A plurality of light emitting diodes connected in reverse parallel may be connected in series. In short, AC drive is
When viewed from the power supply side, it is DC driving when viewed from the light emitting diode side, but if a sine wave voltage is applied to the light emitting diode as it is like a commercial AC power supply, the forward current also changes in a sine wave shape .

In the DC drive system, the drive power supply is DC,
Therefore, the anode of the light emitting diode is connected to the positive electrode side of the DC power supply, and the cathode is connected to the negative electrode side. For this reason, when the base is connected to a low-voltage AC power supply, a rectifying means or a smoothing capacitor is interposed in front of the light emitting diode. The rectifying means or the smoothing capacitor in this case forms a part of the circuit means.

The pulse driving method is a method in which a pulse current is passed through a light emitting diode to perform pulse lighting. If a light-emitting diode having a strong current dependence is used and a pulse current having a large peak value is passed, it can be made brighter than in the case of direct-current drive using the afterimage phenomenon of the human eye. Therefore, the repetition frequency of the pulse current is set relatively high so as to cause an afterimage phenomenon. The pulse drive circuit in this system forms a part of the circuit means.

In any of the above-described driving methods, a current limiting element can be connected in series with the light emitting diode, or a constant current circuit can be used to supply a predetermined forward current. The current limiting element and the constant current circuit in this case form part of the circuit means. The “current limiting element” refers to a resistor and a reactance element, and the latter includes a capacitor and an inductor, and is used in an AC circuit. In addition, a diode can be connected in series with the same polarity as the light emitting diode, or a Zener diode can be connected in parallel to the light emitting diode so that the problem of reverse withstand voltage does not occur.

Next, the wiring means will be described. Less than,
A first wiring means for mounting a large number of light emitting diodes on a hollow base and connecting the wiring means as required, a second wiring means for mounting a current limiting element, a constant current circuit, a rectifying circuit, and the like; A large number of the connected light emitting diodes are connected to a current limiting resistor, a constant current circuit, a rectifier circuit, and the like, and are separately described as third wiring means for connecting these to a base.

The first wiring means can be provided by forming a printed wiring on the inner surface or outer surface of the hollow base. When a printed wiring is formed on the inner surface of the hollow base, a light-emitting diode provided with an elongated lead wire in the hollow base is used, and a through hole for inserting the lead is formed in accordance with the printed wiring. Then, the lead wire is soldered to the printed wiring on the inner surface side of the hollow base. On the other hand, when a printed wiring is formed on the outer surface of the hollow base, a light emitting diode is provided with a conductive film on the bottom surface of the ceramic substrate, or a tongue-shaped lead frame is protruded to the left and right of the light emitting portion. Then, they are soldered on the outer surface side of the middle substrate or connected using a conductive adhesive. However, according to the present invention, the printed wiring is not formed in the hollow base, the lead wire insertion hole is formed in the hollow base, the lead wire of the light emitting diode is inserted from the outside, and the lead wires are connected inside the hollow base. The required connection may be obtained.

Although the second wiring means is not particularly limited,
For example, printed wiring may be formed on the inner surface in addition to the outer surface of the hollow base, or a printed wiring board may be provided and mounted separately from the hollow base and mounted inside the hollow base for mounting.

Although the third wiring means is not particularly limited,
For example, it can be configured by using an appropriate conductor.

<Function of the Present Invention> In the present invention, since a large number of chip-shaped light emitting diodes are dispersedly arranged on the outer surface of the hollow base, at least the entire main part of the bulb portion of the hollow base is removed. White light is uniformly emitted, and as a result, a light distribution characteristic close to that of an incandescent lamp for general illumination is obtained.

Further, since the light emitting portion of the chip type light emitting diode is thin, it is possible to reduce the protruding height from the hollow base.
Therefore, the outer shape of the light emitting portion of the solid-state light source device is dominantly determined by the shape of the hollow base. For this reason, the appearance of the solid-state light source device becomes a shape close to a light diffusion type glass bulb of an incandescent lamp for general lighting or a globe of a bulb-type fluorescent lamp, and there is no strange feeling in the appearance.

Further, since the light emitting portion of the chip type light emitting diode is relatively small, the mass of the solid state light source device is reduced.

According to a second aspect of the present invention, in the solid-state light source device according to the first aspect, the circuit means includes a first printed circuit board formed at least in a bulb portion of the hollow base; The light emitting diode is disposed by being mounted on the first printed wiring;

In the present invention, the first printed wiring may be on either the inner or outer surface of the hollow base. If the first printed wiring is formed on the outer surface, the light emitting diode can be surface-mounted.

Thus, in the present invention, the arrangement of the light emitting diodes becomes easy.

According to a third aspect of the present invention, in the solid-state light source device according to the first or second aspect, the circuit means includes a second printed wiring board housed inside the hollow base and a second printed circuit board. It is characterized by having a current limiting element or a constant current circuit mounted on a printed wiring board.

The current limiting element may be not only a resistor but also a reactive element such as a capacitor or an inductor. The reactance element has a current limiting function when inserted into the AC circuit portion.

The constant current circuit may have any configuration.

In the case of DC driving, when a DC obtained by rectifying an AC is used as a current source, a rectifier circuit can be mounted on the second printed wiring board.

The second printed wiring board may have any configuration, for example, a general-purpose wiring board in which a lead wire is inserted into a wiring hole and soldered, a surface-mounted wiring board,
A flexible wiring board or the like can be used. Further, as long as the second printed wiring board is housed inside the hollow base, any support means may be used. For example, it may be adhered to the inner surface of the hollow base or fixed to a screw base. When the first printed wiring is formed on the inner surface of the hollow base, a terminal piece is protrudingly provided on the second printed wiring board, and the terminal piece is soldered to a predetermined position of the first printed wiring. Connection and fixing may be performed simultaneously.

Thus, in the present invention, the external appearance of the solid-state light source device is simplified by mounting the current limiting element or the constant current circuit on the second printed wiring board and housing it inside the hollow base. At the same time, the mounting of the light emitting diode and the mounting of the current limiting element or the constant current circuit can be performed separately, which facilitates assembly.

A solid-state light source device according to a fourth aspect of the present invention is the solid-state light source device according to any one of the first to third aspects, wherein the hollow base has a substantially spherical bulb portion. I have.

In the present invention, a shape suitable for the light distribution characteristics of the bulb portion of the hollow substrate is defined. In other words, if the bulb portion of the hollow base has a true spherical shape, the light distribution characteristics in the vertical direction will be a good circular shape like a ball-shaped incandescent light bulb. Suitability is improved.

According to a fifth aspect of the present invention, there is provided a solid state light source device comprising: a screw base; a hollow base having a bulb portion and a neck portion, the neck portion being mounted on the screw base; A plurality of chip-shaped light-emitting diodes, each of which is of a white light-emitting type and has a total rated light flux of 150 lm or more; and circuit means for wiring the light-emitting diodes as required and connecting to the base. It is characterized by doing.

The present invention specifies a solid-state light source device that emits light with a light beam that can be used for general illumination.
That is, the incandescent lamp having a rated voltage of 100 V commercially available for general lighting has the smallest wattage classification of 20 watts.
W-shaped, with a total light flux of 170 lm
About 10% lower than this luminous flux value.
If it is 50 lm or more, it can be replaced without any inconvenience for general lighting. Therefore, in the present invention, the total of the rated luminous flux of all the mounted light emitting diodes is specified to be 150 lm or more. The “rated luminous flux” refers to a luminous flux value calculated based on the standard luminous intensity and the standard half-width of a single light-emitting diode, regardless of whether it is actually specified. Also, “sum”
A value obtained by multiplying the rated luminous flux of a single light emitting diode by the number used.

Thus, according to the present invention, general illumination can be performed with a required brightness. For example, if the light emitting efficiency of a light emitting diode is about 15 lm / W and the rated power consumption of one light emitting diode is 0.1 W, then 10
If zero light emitting diodes are used, the sum of the rated luminous flux is 1
It will be 50 lm.

A solid-state light source device according to a sixth aspect of the present invention is the solid-state light source device according to any one of the first to fifth aspects, wherein the light-transmitting insulating coating is applied to the outer surface of the hollow substrate from above the light emitting diode. It is characterized by having.

The present invention specifies a preferred configuration of a solid-state light source device with improved insulation performance. That is, a light-transmitting insulating coating is applied to the outer surface of the hollow substrate from above the light emitting diode. For the insulating coating, for example, a synthetic resin such as a light-transmitting silicone resin or a light-transmitting fluororesin can be used. To form a translucent insulating coating, dipping,
Known application means such as spraying and electrostatic coating can be used.

Thus, in the present invention, even if the light emitting diode is mounted on either the outer surface or the inner surface of the hollow base, the externally exposed portion of the lead portion and the printed wiring portion are covered by the transparent insulating coating. Because it is covered, there is no insulation problem and the appearance is elegant.

Further, by using a transparent substance as the light-transmitting insulating coating, it is possible to maintain a high light transmittance.

Further, by using a light diffusing substance, the luminance distribution on the surface of the hollow substrate is leveled,
Appearance is further improved.

[0063]

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

FIG. 1 is a sectional view showing a first embodiment of the solid-state light source device of the present invention.

FIG. 2 is a partially cut-away enlarged plan view showing a main part of the light emitting diode.

FIG. 3 is a partially cut-away enlarged front view showing a main part of the light emitting diode.

FIG. 4 is a circuit diagram showing a driving circuit of a light emitting diode.

In each figure, 1 is a screw cap, 2 is a hollow base, 3 is a light emitting diode, and 4 is a circuit means.

The screw base 1 is an E26 type screw base.

The hollow substrate 2 is formed by molding a white PBT, and comprises a bulb portion 2a and a neck portion 2b. The valve section 2a includes a valve main section 2a1 and a valve base section 2a2. Although not shown, the valve main part 2a1 is divided into a plurality of parts and molded, but is adhered to form a main part of a true sphere. Although not shown, a large number of wiring holes are formed at a substantially constant pitch in the valve main portion 2a1, and printed wiring for connecting the wiring holes as required is formed on the inner surface. Valve base 2a
2 is formed separately from the valve main portion 2a1, but is fitted with and bonded to the valve main portion 2a1 to constitute a substantially spherical valve portion 2a. The neck part 2b is formed integrally with the valve base part 2a2, and is inserted into the screw base 1 to partially crimp the vicinity of the open end of the screw base 1 to join them together.

As shown in FIGS. 2 and 3, the light emitting diode 3 comprises a light emitting portion 3a and a pair of lead wires 3b formed by extending a lead frame. The light emitting unit 3a
The ceramic substrate 3a1, the translucent resin seal portion 3a2, and an embedded component (not shown) embedded in the translucent resin seal portion 3a2. Embedded components are a lead frame, a light emitting diode chip, and a bonding wire. The pair of lead wires 3 b are both bent at right angles to the substrate surface, inserted into wiring holes (not shown) of the hollow base 2, and soldered on the inner surface side of the hollow base 2. As an example of the light emitting diode 3, a forward voltage of 3.6
V, forward current: 20 mA, rated luminous intensity: 1560 mcd, half-value width: 50 °, and luminous efficiency: about 15 lm / W. By using 180 light emitting diodes 3 in total,
The power consumption is about 13 W and the total sum of the rated luminous flux is 194 lm, so that a solid-state light source device equivalent to a 20 W incandescent lamp for general lighting can be obtained.

As shown in FIG. 4, the circuit means 4 mainly includes a first printed wiring board 4a and a second printed wiring board 4b. First printed wiring board 4a
Are formed on the inner surface of the hollow base, and mount a large number of light emitting diodes 3 to form a series-parallel connection circuit. As the series-parallel connection circuit, for example, six light emitting diodes connected in series are connected in parallel to form a light emitting diode group. The second printed wiring board 4b is
The current limiting element 4b1 and the rectifier circuit 4b2 are mounted separately from the printed wiring board 4a. The current limiting element 4b1 is formed of a resistor, and has one end connected to the positive electrode of the DC output terminal of the rectifier circuit 4b2. Also, the second
In the printed wiring board 4b, the positive electrode of the DC output of the rectifier circuit 4b2 is connected to the anode side of the light emitting diode group of the first printed wiring board 4a via the current limiting element 4b1 and the conductor w1, and the negative electrode is connected via the conductor w2. Similarly, it is directly connected to the cathode side of the light emitting diode group. Further, the second printed wiring board 4b is supported while the AC input terminal of the rectifier circuit 4b2 is connected to the screw base 1 via the conductors w3 and w4. Screw cap 1 is 100
Connect to V AC power supply AC.

Thus, according to the present embodiment, it is possible to obtain a solid-state light source device similar in basic outline to an incandescent light bulb for general illumination having a ball-shaped light diffusion glass bulb.

Although not shown, the hollow substrate 2
Lead wire 3b of light emitting diode 3 exposed on the outer surface of
Is covered with a partially applied insulating paint.

FIG. 5 is a sectional view showing a solid-state light source device according to a second embodiment of the present invention.

FIG. 6 is an enlarged plan view showing the same light emitting diode.

FIG. 7 is an enlarged front view showing the same light emitting diode.

FIG. 8 is an enlarged bottom view showing the same light emitting diode.

In each figure, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the light emitting diode 3 'is surface-mounted,
The difference is that a transparent insulating coating 5 is provided.

That is, as shown in FIGS. 6 to 8, the light emitting diode 3 'comprises a light emitting portion 3a' and a lead portion 3b 'of the conductive film. The light emitting portion 3a 'connects a light emitting diode chip to a conductive film adhered on the upper surface of the ceramic substrate via a bonding wire (both not shown), and the conductive film through a through hole (not shown). And is connected to a lead portion 3b 'described later. A pair of the lead portions 3b '
It is formed spaced apart from the bottom surface of a1.

The circuit means 4 ′ has a first printed wiring board 4 a ′ formed on the outer surface of the hollow base 2.

The transparent insulating coating 5 is made of a transparent silicone resin. After forming the light emitting diode 3 ′ and other necessary wirings, the main part of the bulb portion 2 a of the hollow base 2 is dipped in a silicone resin liquid and solidified. It is formed. Therefore, the charged portion of the first printed wiring board 4a 'is covered with the transparent insulating coating 5, so that there is no problem of insulation.

FIG. 9 is a front view showing a main part of a solid-state light source device according to a third embodiment of the present invention.

In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is different in that the hollow substrate 2 has a PS shape.

Thus, according to the present embodiment, it is possible to obtain a solid-state light source device similar in basic outline to an incandescent light bulb for general illumination having a PS-type light diffusion glass bulb.

FIG. 10 shows a fourth embodiment of the solid-state light source device according to the present invention.
It is a front view showing an important section in an embodiment.

In the figure, the same parts as those in FIG. 9 are denoted by the same reference numerals, and the description is omitted. This embodiment is different in that the hollow substrate 2 has a T shape.

Thus, according to the present embodiment, a solid-state light source device having a basic outline similar to that of a bulb-type fluorescent lamp having a T-shaped light diffusion glass bulb can be obtained.

[0089]

According to each of the first to fourth aspects of the present invention, there is provided a valve portion and a neck portion, and the neck portion is dispersed on at least an outer surface of a main portion of the hollow base mounted on the screw base, and has a bottom surface. By disposing a number of chip-shaped white light emitting type light emitting diodes almost in contact with the outer surface of the hollow base, and by wiring the light emitting diodes as required, and by providing circuit means for connecting to the base. In addition, light distribution characteristics close to those of incandescent light bulbs for general lighting are obtained, and since the height of the light emitting diode protruding from the hollow base is small and the outer shape of the light emitting portion is dominantly determined by the shape of the hollow base, the appearance is reduced. It is shaped like a light-diffusing glass bulb for incandescent bulbs for general lighting or a globe for bulb-type fluorescent lamps.
It is possible to provide a solid-state light source device that does not have an unnatural appearance and has relatively small mass.

According to the second aspect of the present invention, the circuit means further comprises the first printed wiring board formed at least in the bulb portion of the hollow base, and the light emitting diode is mounted on the first printed wiring. Accordingly, it is possible to provide a solid-state light source device in which the light-emitting diodes can be easily disposed on the hollow base.

According to the third aspect of the present invention, in addition to the circuit means, the second printed wiring board housed inside the hollow base and the current limiting element or the constant current circuit mounted on the second printed wiring board are provided. By providing, the appearance is simplified, and the mounting of the light emitting diode and the mounting of the current limiting element or the constant current circuit can be performed separately,
A solid-state light source device that can be easily assembled can be provided.

According to the fourth aspect of the present invention, in addition, since the hollow base has a substantially spherical shape in the bulb portion, the light distribution characteristics in the vertical direction are as good as a ball-shaped incandescent lamp. Thus, it is possible to provide a solid-state light source device whose suitability is further improved when used in a lighting fixture for general lighting.

According to the fifth aspect of the present invention, the hollow base provided with the bulb portion and the neck portion is of a white light-emitting type at least on the outer surface of at least the main portion of the hollow base mounted on the screw base. Total light flux is 150 l
m can be used for general lighting by dispersing and arranging a large number of chip-shaped light emitting diodes of m or more, and by connecting the light emitting diodes to the base as required by the circuit means. A shaped light source device can be provided.

According to the invention of claim 6, in addition to the provision of the light-transmitting insulating coating applied to the outer surface of the hollow base from above the light emitting diode, the exposed portion of the lead portion and the printed wiring portion are provided. Is covered with a light-transmitting insulating coating, so that a problem of insulation does not occur and a solid-state light source device with an elegant appearance can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a solid-state light source device of the present invention.

FIG. 2 is a partially cutaway enlarged plan view showing a main part of the light emitting diode.

FIG. 3 is a partially cutaway enlarged front view showing a main part of the light emitting diode.

FIG. 4 is a circuit diagram showing a light emitting diode driving circuit.

FIG. 5 is a sectional view showing a second embodiment of the solid-state light source device of the present invention.

FIG. 6 is an enlarged plan view showing the same light emitting diode.

FIG. 7 is an enlarged front view showing the same light emitting diode.

FIG. 8 is an enlarged bottom view showing the same light emitting diode.

FIG. 9 is a front view showing a main part of a solid-state light source device according to a third embodiment of the present invention.

FIG. 10 is a front view showing a main part of a solid-state light source device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Screw base 2 ... Hollow base 2a ... Valve part 2a1 ... Valve main part 2a2 ... Valve base part 2b ... Neck part 3 '... Light emitting diode 4' ... Circuit means 4a '... First printed wiring board 4b ... Second Printed wiring board 4b1 Current limiting element 4b2 Rectifier circuit 5 Transparent insulating coating

Claims (6)

[Claims] A hollow base having a valve portion and a neck portion, wherein the neck portion is attached to the screw base;
A large number of chip-shaped light emitting diodes each of a white light emitting type, which are dispersed on at least the outer surface of at least the main part of the bulb portion of the hollow substrate and whose bottom surface is disposed substantially in contact with the outer surface of the hollow substrate; Circuit means for wiring and connecting to a base as required. 2. The circuit means includes a first printed wiring board formed at least in a bulb portion of the hollow base; and the light emitting diode is disposed by being mounted on the first printed wiring; The solid-state light source device according to claim 1, wherein: 3. The circuit means includes a second printed wiring board housed inside the hollow base and a current limiting element or a constant current circuit mounted on the second printed wiring board. The solid-state light source device according to claim 1. 4. The solid-state light source device according to claim 1, wherein the hollow base has a substantially spherical bulb portion. 5. A screw base; a hollow base having a valve part and a neck part, wherein the neck part is mounted on the screw base;
A plurality of chip-shaped light-emitting diodes, each of which is of a white light-emitting type and whose total luminous flux is 150 lm or more; Circuit means for wiring and connecting to a base; and a solid-state light source device. 6. The solid-state light source device according to claim 1, further comprising a light-transmitting insulating coating applied to an outer surface of the hollow substrate from above the light emitting diode.