Source: https://patents.google.com/patent/JP4045781B2/en
Timestamp: 2020-02-22 17:04:42
Document Index: 617031980

Matched Legal Cases: ['art 23', 'art 12', 'art 12', 'art 11', 'art 11', 'art 61', 'art 61', 'art 12', 'art 12', 'art 61', 'art 61', 'art 71', 'art 12', 'art 11', 'art\n50']

JP4045781B2 - Light emitting device - Google Patents
JP4045781B2
JP4045781B2 JP2001340832A JP2001340832A JP4045781B2 JP 4045781 B2 JP4045781 B2 JP 4045781B2 JP 2001340832 A JP2001340832 A JP 2001340832A JP 2001340832 A JP2001340832 A JP 2001340832A JP 4045781 B2 JP4045781 B2 JP 4045781B2
JP2001340832A
JP2003152225A (en
2001-11-06 Application filed by 松下電工株式会社 filed Critical 松下電工株式会社
2003-05-23 Publication of JP2003152225A publication Critical patent/JP2003152225A/en
2008-02-13 Publication of JP4045781B2 publication Critical patent/JP4045781B2/en
The present invention relates to a light emitting device using a light emitting diode chip.
Conventionally, a light-emitting device using a light-emitting diode chip has been proposed as shown in FIG. In the light emitting device having the configuration shown in FIG. 18A, an insulating layer 22 made of an insulating resin such as glass epoxy is formed on one surface of a metal plate 21 made of a metal material having a high thermal conductivity such as aluminum. A light emitting diode chip (hereinafter referred to as an LED chip) 1 is mounted on a metal substrate 20 on which a wiring portion (wiring pattern) 23 made of copper foil is formed on a layer 22. Here, the thickness of the insulating layer 22 is about 100 μm. Further, the LED chip 1 is electrically connected to the wiring part 23 via the bonding wire W. In addition, as the LED chip 1, for example, a sapphire substrate in which a gallium nitride-based light emitting portion is formed is used.
Further, in the above-described light emitting device, a frame-shaped frame member 30 that is circularly opened around a portion where the LED chip 1 is mounted on the metal substrate 20 is interposed through an adhesive layer 40 (see FIG. 18B) made of an adhesive. The LED chip 1 is sealed by pouring a transparent sealing resin such as epoxy resin or silicone resin into the frame member 30. Further, the frame member 30 is opened in an inverted trapezoidal shape in which the inner diameter decreases as it approaches the metal substrate 20, but as it approaches the metal substrate 20 in the vicinity of the metal substrate 20 as shown in FIG. The inner diameter is large.
Here, the light from the LED chip 1 is taken out to the front side (upper side in FIG. 18A) through the resin sealing portion 50 made of the sealing resin filled inside the frame member 30.
By the way, in the light emitting device having the configuration shown in FIG. 18A, since the LED chip 1 is directly mounted on the metal substrate 20 having high thermal conductivity, compared with the case where the surface mount type LED is mounted on the substrate. Since the heat generated in the LED chip 1 can be easily released to the outside, the heat dissipation is high, the luminous efficiency is lowered due to the temperature rise of the LED chip 1, the lifetime of the LED chip 1 is reduced, and the sealing resin portion 50 It has the advantage that deterioration can be suppressed. Further, white resin is used as the frame member 30, and the light of the LED chip 1 is reflected by the inner peripheral surface 31 of the frame member 30 and extracted to the outside. It has a function as a reflecting member that reflects light, and has an advantage that light from the LED chip 1 can be efficiently extracted to the front side.
However, in the conventional light emitting device, the LED chip 1 is not directly mounted on the metal plate 21, but is mounted on the insulating layer 22 having a thermal conductivity lower than that of the metal plate 21 and a thickness of about 100 μm. Therefore, there is a problem in that the heat dissipation is reduced as compared with the case of mounting directly on the metal plate 21.
In the conventional light emitting device, the adhesive layer 40 is interposed between the frame member 30 and the metal substrate 20, and the thickness of the wiring portion 23 is about 80 μm. The thickness obtained by adding the thickness (that is, the thickness of the copper foil), the thickness of the adhesive layer 40, and the thickness of the portion of the frame member 30 where the inner diameter increases toward the metal substrate 20 on the side closer to the metal substrate 20 The thickness H (see FIG. 18B) is larger (thickness H is about 300 μm), and the frame member 30 has a function as a reflecting member at a position higher than the LED chip 1. It is only the part which is doing. Therefore, when the LED chip 1 uses a transparent substrate such as a sapphire substrate, the light emitted from the light emitting portion of the LED chip 1 is also emitted in the lateral direction. There was a problem that it could not be taken out efficiently.
By the way, in order to improve heat dissipation, it is possible to remove the insulating layer 22 where the LED chip 1 is mounted and mount the LED chip 1 on the metal plate 21. In this case, the thickness of the insulating layer 22 is considered. Therefore, the efficiency of extracting light emitted from the LED chip 1 in the lateral direction to the outside is further reduced.
Further, in the conventional light emitting device, white resin is used as the material of the frame member 30 in order to increase the light extraction efficiency to the outside, but the white resin is not heated during heating in the mounting process of the LED chip 1. Oxidized and colored, the reflective performance may be reduced. In addition, when a blue LED chip is used as the LED chip 1, the resin of the frame member 30 is deteriorated and colored by the blue light emitted from the LED chip 1, and the reflection performance may be lowered.
The present invention has been made in view of the above reasons, and an object of the present invention is to provide a light emitting device that can improve heat dissipation and can efficiently extract the light from the light emitting diode chip to the outside as compared with the prior art. It is in.
In order to achieve the above object, the invention of claim 1 projects forward.Multiple bumpsThere is an exit andEach bumpA metal plate with a storage recess formed in the front of the outlet, Each yieldBottom of recessArranged so that each pad is on the top sideThermally bonded to the metal plateMultiple departuresWith photodiode chip, Each clashOutingEach insertedEnteredMultiple insertionsInsulating base material joined to the metal plate in the form of a hole and overlapped with the metal plate, and has translucencyEach departureIt consists of a sealing resin that seals the photodiode chip.Multiple treesWith an oil seal,, Each departurePhotodiode chipAnd power through the bonding wireFrom the printed circuit board where the wiring part to be electrically connected is formed on the surface opposite to the metal plate sideThe thickness of the printed circuit board is the same as the protruding height of the protruding portion of the metal plateIt is characterized byMultiple departuresPhoto diode chipEachSince it is located at the bottom of the storage recess and is thermally coupled to the metal plate (ieMultiple departuresSince the photodiode chip is mounted directly on the metal plate), heat dissipation is improved compared to the conventional one mounted via an insulating layer, and the luminous efficiency decreases due to the temperature rise of the LED chip, and the lifetime decreases. The reduction of the sealing resin can be suppressed, and the light emitted from the light emitting diode chip is reflected by the inner peripheral surface of the housing recess and taken out of the housing recess. In addition, it is possible to prevent the reflection performance from being deteriorated during heating in the mounting process of the light emitting diode chip or the reflection performance from being irradiated by the light from the light emitting diode chip.
According to a second aspect of the present invention, in the first aspect of the invention, since the insulating base is provided with a resin filling portion filled with at least a part of the sealing resin, an epoxy resin or the like is used as the sealing resin. It can be easily sealed using a molding resin such as a silicone resin.
The invention of claim 3 is the invention of claim 2, further comprising a frame-shaped frame member that is joined in a form overlapped on the front surface side of the insulating base material and surrounds the entire periphery of the insertion hole. Since the resin is filled inside the resin filling portion and the frame member, a space for filling the sealing resin can be easily and inexpensively formed.
Claim4In the invention of claim 3, in the invention of claim 3, since a reflective film made of a metal material having a higher reflectance than the frame member is formed on the inner peripheral surface of the frame member, the light emitted from the light emitting diode chip The extraction efficiency to the outside can be improved.
Claim5The invention according to claim 3 further comprises a circuit component mounting base material that is joined to the front side of the insulating base material together with the frame member and is provided with a wiring part on the front side. Since the thickness of the base material is such that the frame member does not protrude forward from the circuit component mounting base material, the surface mounting type circuit component is easily mounted on the front side of the circuit component mounting base material by the reflow process. be able to.
Claim6According to the invention of claim 3, since a reflecting member having a higher reflectance than the insulating base is provided on the front side of the insulating base inside the frame member, the light is emitted from the light emitting diode chip. The efficiency of taking out the light to the outside can be further improved.
Claim7In the invention of claim 1, in the invention of claim 1, since the inner peripheral surface of the housing recess is a part of the paraboloid of revolution, the light emitted to the side surface side or the rear surface side of the light emitting diode chip is efficiently transmitted to the front surface side. The light can be reflected well, and the efficiency of taking out the light emitted from the light emitting diode chip to the outside can be further improved.
Claim8In the invention of claim 1, in the invention of claim 1, the insulating base material is provided with a region that does not overlap with the metal plate, and the circuit component is mounted on the rear side of the region. Even circuit components can be mounted without risking short-circuiting through the metal plate, and light emitted from the light-emitting diode chip is not absorbed or reflected by the circuit components. The efficiency of extracting the light emitted from the diode chip to the outside can be further improved.
As shown in FIG. 1, the light emitting device of the present embodiment is provided with a plurality of columnar protrusions 11a protruding forward (upward in FIG. 1) on a metal plate 11 made of aluminum, and on the front surface of each protrusion 11a. Storage recesses 11b for storing light-emitting diode chips (hereinafter referred to as LED chips) 1 are formed. That is, the metal plate 11 is provided with a plurality of protrusions 11a protruding forward, and a storage recess 11b is formed on the front surface of each protrusion 11a. Here, the storage recess 11b has a bottom surface area (size) set so that the LED chip 1 can be directly mounted on the bottom surface, and the depth direction dimension is set larger than the thickness of the LED chip 1. It is.
The metal plate 11 has a light emitting diode chip (hereinafter referred to as LED chip) 1 mounted (arranged) on the bottom surface (bottom) of the housing recess 11b, and the LED chip 1 is thermally coupled to the metal plate 11. Yes. The storage recess 11b is opened in a circular shape, and is formed such that the inner diameter gradually increases as it approaches the front surface. That is, the inner peripheral surface of the storage recess 11b is inclined so that the opening side becomes wider. Therefore, the light emitted from the LED chip 1 in the lateral direction is reflected by the inner peripheral surface of the storage recess 11b and is taken out of the storage recess 11b.
A printed circuit board 12 is bonded to the front surface of the metal plate 11 in a form in which a printed circuit board 12 made of a glass epoxy board is overlapped. Here, the printed circuit board 12 is bonded to the metal plate 11 on the surface opposite to the surface on which the wiring portion (wiring pattern) 12a made of copper foil is provided. In the printed circuit board 12, a plurality of insertion holes 13 through which the protruding portions 11a protruding from the metal plate 11 are inserted are provided in the thickness direction. Here, the protrusion height (protrusion amount) of the protrusion 11a from the front surface of the metal plate 11 and the thickness of the printed circuit board 12 are set to be substantially the same value.
A wiring portion 12a provided on the front surface of the printed circuit board 12 extends to the vicinity of the insertion hole 13, and is electrically connected to the LED chip 1 via a bonding wire W made of a metal thin wire (for example, a gold thin wire). ing. As described above, the bottom surface of the housing recess 11b on which the LED chip 1 is mounted protrudes forward from the joint surface of the metal plate 11 with the printed circuit board 12, thereby providing a pad (not shown) on the surface of the LED chip 1. ) And the wiring part 12a can be made substantially the same height, and the electrical connection between the LED chip 1 and the wiring part 12a by the bonding wire W can be easily performed. In the present embodiment, the printed circuit board 12 constitutes an insulating base material.
As the LED chip 1, a blue LED chip in which a gallium nitride-based light emitting part is formed on a sapphire substrate is used.
The LED chip 1 and the bonding wire W are sealed by a resin sealing portion 50 made of a transparent sealing resin such as an epoxy resin or a silicone resin. In the present embodiment, when forming the resin sealing portion 50, the epoxy resin for molding is dropped, but even if the resin sealing portion 50 is formed with a transfer epoxy resin using a mold. In this case, it is easy to control the shape of the resin sealing portion 50. For example, the resin sealing portion 50 is formed in a hemispherical shape that is convex forward, and the resin sealing portion 50 has a function as a lens. It is also possible to have it.
In the present embodiment, the thickness of the metal plate 11 is 0.6 mm, the diameter of each protrusion 11 a is 1 mm, the protrusion height (protrusion amount) of each protrusion 11 a is 0.3 mm, and each storage recess 11 b is The depth is 0.3 mm, and the diameter of the bottom surface of each storage recess 11 b is set to 0.7 mm. On the other hand, the thickness of the printed circuit board 12 is set to 0.3 mm. The LED chip 1 is set to a chip size of 350 μm □ and a thickness of 80 μm so that the LED chip 1 can be placed on the bottom surface of the storage recess 11b.
Thus, in the light emitting device of the present embodiment, the LED chip 1 is mounted on the bottom surface of the housing recess 11b provided on the front surface of the protruding portion 11a protruding from the metal plate 11, so that the heat generated in the LED chip 1 is generated. The heat can be quickly radiated to the outside through the metal plate 11. That is, the metal plate 11 functions as a heat sink. Further, since the height position of the front surface of the LED chip 1 is lower than the front surface of the protruding portion 11a, the light emitted from the LED chip 1 in the lateral direction is caused by the inner peripheral surface of the storage recess 11b formed in the protruding portion 11a. The light is reflected and extracted to the outside, and the light extraction efficiency is improved.
And since the protrusion part 11a is formed with the metal, it can suppress compared with the past that the part which functions as a reflection member by oxidation in the mounting process of the LED chip 1 is oxidized, and functions as a reflection member. It can suppress that the part to perform deteriorates by irradiating the blue light from LED chip 1. FIG.
In the present embodiment, the space between the inner peripheral surface of the insertion hole 13 and the outer peripheral surface of the protruding portion 11a in the printed circuit board 12 forms a resin filling portion.
The basic configuration of the light emitting device of the present embodiment is substantially the same as that of the first embodiment. As shown in FIG. 2, a frame-shaped (annular) frame member 30 made of white plastic resin is attached to the front surface of the printed circuit board 12. In FIG. 2, the insertion hole 13 is joined so as to surround the entire circumference, and the sealing resin constituting the resin sealing portion 50 that seals the LED chip 1 and the bonding wire W is filled inside the frame member 30. Is different. put it hereResin sealing partThe front surface of 50 and the front surface of the frame member 30 are substantially aligned. The frame member 30 is formed in a shape such that the inner diameter gradually increases as it approaches the front side. The resin sealing portion 50 is formed by dropping a transparent epoxy resin.
Therefore, in this embodiment, by providing the frame member 30, the shape of the resin sealing portion 50 can be easily controlled even if a molding sealing resin is used as the material of the resin sealing portion 50. it can.
Further, since the wiring portion 12a on the front surface of the printed circuit board 12 extends under the frame member 30 to the vicinity of the insertion hole 13, the LED chip 1 and the wiring are provided regardless of the provision of the frame member 30. The operation of electrically connecting the portion 12a with the bonding wire W is facilitated. As the LED chip 1, a blue LED chip in which a gallium nitride-based light emitting part is formed on a sapphire substrate is used as in the first embodiment.
In the present embodiment, similarly to the first embodiment, the thickness of the metal plate 11 is 0.6 mm, the diameter of each protrusion 11 a is 1 mm, and the protrusion height (protrusion amount) of each protrusion 11 a is 0.3 mm. The depth of each storage recess 11b is 0.3 mm, and the diameter of the bottom surface of each storage recess 11b is set to 0.7 mm. On the other hand, the thickness of the printed circuit board 12 is set to 0.3 mm. The LED chip 1 is set to a chip size of 350 μm □ and a thickness of 80 μm so that the LED chip 1 can be placed on the bottom surface of the storage recess 11b. The frame member 30 has an inner diameter of 3 mm and a thickness of 1 mm.
By the way, in this embodiment, although the accommodation recess 11b is provided in the front surface of the protrusion part 11a which protruded in the front surface of the metal plate 11, the LED chip 1 is mounted (arranged) on the bottom surface (bottom part) of the accommodation recess 11b. As shown in FIG. 3, even if the LED chip 1 is directly mounted on the front surface of the protruding portion 11a, the light emitted from the LED chip 1 in the lateral direction may be blocked by the lower end portion of the frame member 30. It is taken out outside.
Of this reference exampleThe light emitting device is configured as shown in FIG. 4 and is three-dimensionally formed on the surface of an insulating base material made of a three-dimensionally molded resin instead of the printed circuit board 12 (see FIG. 1) described in the first embodiment. MID (Molded Interconnected Device) A difference from the first embodiment is that a substrate 60 is used. That is,In this reference exampleThe MID substrate 60 is overlapped and joined to the front surface of the metal plate 11. Here, the MID substrate 60 has an insertion hole 62a into which the protruding portion 11a protruding from the front surface of the metal plate 11 is inserted, and a resin filling portion 62b that is connected to the insertion hole 62a and is filled with a sealing resin. Yes. However, the sealing resin is also filled in the space between the inner peripheral surface of the insertion hole 62a and the outer peripheral surface of the protruding portion 11a. The dimensions are set so that the thickness in the vicinity of the insertion hole 62b in the MID substrate 60 is substantially the same as the protruding amount of the protruding portion 11a. In addition,In this reference exampleThe MID substrate 60 constitutes a three-dimensional circuit molded product.
Further, the MID substrate 60 has a wiring portion 61 formed on the front surface extending to the vicinity of the insertion hole 62b along the inner peripheral surface of the resin filling portion 62b, and the wiring portion 61 and the LED chip 1 are bonded to the bonding wire W. It is electrically connected via. As the LED chip 1, a blue LED chip in which a gallium nitride-based light emitting part is formed on a sapphire substrate is used as in the first embodiment.
In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 1, and description is abbreviate | omitted. Also,In this reference exampleAs in the first embodiment, the thickness of the metal plate 11 is 0.6 mm, the diameter of each protrusion 11 a is 1 mm, the protrusion height (protrusion amount) of each protrusion 11 a is 0.3 mm, and each storage recess The depth of 11b is 0.3 mm, and the diameter of the bottom surface of each storage recess 11b is set to 0.7 mm.
On the other hand, the insulating base material of the MID substrate 60 is made of Amodel resin (trademark of BP Amo Copolymers), and the resin filling portion 62b is opened in a circular shape, and the inner diameter gradually increases toward the front surface. Here, the insulating base material of the MID substrate 60 is set to have a thickness of 0.3 mm around the insertion hole 62a and 1.3 mm around the resin filling portion 62b. A polyphthalamide resin may be used as the insulating base material of the MID substrate 60.
Resin sealing partThe front surface of 50 and the front surface of the MID substrate 60 are substantially aligned.In this reference exampleSince the resin filling portion 62b is formed on the MID substrate 60, there is no need to separately form and bond the frame member 30 (see FIG. 2) for filling the sealing resin as in the second embodiment. Thus, the assembling work becomes easier as compared with the second embodiment.
by the way,In this reference exampleUses one MID substrate 60 for a plurality of LED chips 1, but as shown in FIG. 5, a printed circuit board made of a glass epoxy substrate on a metal plate 11 having a plurality of protruding portions 11a protruding on the front surface. 12 may be stacked and bonded, and the MID substrate 60 may be provided for each LED chip 1. That is, each MID substrate 60 has an insertion hole 62a formed at a portion corresponding to the insertion hole 13 in which the protruding portion 11a is inserted in the printed circuit board 12, and a resin filling portion 62b communicating with the insertion hole 62a on the front side. Is formed.
In the example shown in FIG. 5, the LED chip 1 and the wiring part 61 of the MID substrate 60 are connected by bonding wires W, and the wiring part 61 of the MID substrate 60 is connected to the wiring part 12 a of the printed circuit board 12. That is, the LED chip 1 is electrically connected to the wiring part 12 a of the printed circuit board 12 through the bonding wire W and the wiring part 61 of the MID board 60. Although it is difficult to increase the area of the MID substrate and it is relatively expensive, by employing the configuration shown in FIG. 5, the amount of material used for the MID substrate can be reduced, and a light-emitting device with a large area can be realized relatively inexpensively. It becomes possible.
Of this reference exampleThe basic structure of the light emitting device is shown in FIG.Reference Example 1 andAs shown in FIG. 6, the metal plate 11 is cut with a rotary blade cutter to form the cut portion 15 to electrically insulate the protruding portions 11 a from each other, and the wiring portion 61 in the MID substrate 60. Is partially extended to the back surface of the MID substrate 60 along the inner peripheral surface of the resin filling portion 62b and the inner peripheral surface of the insertion hole 62a, and is electrically connected to the metal plate 11.
Also,In this reference exampleUses a red LED chip having a light emitting portion formed of an AlInGaP-based material and electrodes on both sides in the thickness direction as the LED chip 1, and the back surface of the LED chip 1 is made of a conductive paste (for example, silver paste). ) On the bottom surface of the storage recess 11b. That is, the electrode on the back surface of the LED chip 1 and the metal plate 11 are electrically connected. Further, the electrodes (pads) on the surface of the LED chip 1 are electrically connected to the wiring part 61 of the MID substrate 60 via the bonding wires W.
In additionReference Example 1 andSimilar components are denoted by the same reference numerals, and description thereof is omitted. Also,In this reference exampleLeaveAnd Reference Example 1Similarly, the thickness of the metal plate 11 is 0.6 mm, the diameter of each protrusion 11 a is 1 mm, the protrusion height (projection amount) of each protrusion 11 a is 0.3 mm, and the depth of each storage recess 11 b is 0. The diameter of the bottom of each storage recess 11b is set to 0.7 mm.
ButIn this reference exampleCan use an LED chip having electrodes on both sides in the thickness direction as the LED chip 1. Also, if a plurality of LED chips are connected in parallel, the current flowing through the LED chips will differ depending on the voltage characteristics of the individual LED chips.In this reference exampleSince each LED chip 1 is connected in series, current control is possible.
Of this reference exampleThe basic structure of the light emitting device is shown in FIG.Reference Example 2 andAs shown in FIG. 7, the plurality of metal plates 11 with the protruding portions 11 a protruding from each other are bonded to the back surface side (the lower surface side in FIG. 7) of the MID substrate 60, and the surface of the MID substrate 60 (FIG. 7 is different in that a part of the wiring portion 61 on the upper surface in FIG. 7 is extended to the back surface through the through hole 63 and electrically connected to the metal plate 11.
In additionReference Example 2 andSimilar components are denoted by the same reference numerals, and description thereof is omitted. Also,In this reference exampleLeaveAnd Reference Example 2Similarly, the thickness of the metal plate 11 is 0.6 mm, the diameter of each protrusion 11 a is 1 mm, the protrusion height (projection amount) of each protrusion 11 a is 0.3 mm, and the depth of each storage recess 11 b is 0. The diameter of the bottom of each storage recess 11b is set to 0.7 mm.
ButIn this reference example, Reference Example 2 andSimilarly, the LED chip 1 having electrodes on both sides in the thickness direction can be used as the LED chip 1. Also, if a plurality of LED chips are connected in parallel, the current flowing through the LED chips will differ depending on the voltage characteristics of the individual LED chips.In this reference exampleSince each LED chip 1 is connected in series, current control is possible.
Of this reference exampleThe light emitting device is configured as shown in FIG. 8, and the basic configuration is shown in FIG.Reference Example 1 andIt is almost the same. by the wayIn Reference Example 1Used an aluminum plate as the metal plate 11,In this reference exampleUses a copper plate having higher adhesiveness to the MID substrate 60 and higher thermal conductivity than the aluminum plate as the metal plate 11, and as shown in FIG. 8, the front surface of the protruding portion 11 a protruding from the front surface of the metal plate 11. A difference is that a reflective film 17 made of aluminum, which is a metal material having a higher reflectance than the metal plate 11, is provided on the bottom surface and the inner peripheral surface of the storage recess 11b formed in FIG. Here, the reflective film 17 is formed by masking portions of the metal plate 11 other than the housing recess 11b and evaporating aluminum. The thermal conductivity of aluminum is 236 W / (m · K), and the thermal conductivity of copper is 403 W / (m · K).
In additionReference Example 1 andSimilar components are denoted by the same reference numerals, and description thereof is omitted. Also,In this reference exampleLeaveAnd Reference Example 1Similarly, the thickness of the metal plate 11 is 0.6 mm, the diameter of each protrusion 11 a is 1 mm, the height (projection amount) of each protrusion 11 a is 0.3 mm, and the depth of each storage recess 11 b is 0.3 mm. And the diameter of the mounting surface formed of the bottom surface of each storage recess 11b is set to 0.7 mm. Further, the insulating base material of the MID substrate 60 is made of Amodel resin (trademark of BP Amo Copolymers), and the resin filling portion 62b is opened in a circular shape, and the inner diameter gradually increases as it approaches the front surface. Here, the insulating base material of the MID substrate 60 is set to have a thickness of 0.3 mm around the insertion hole 62a and 1.3 mm around the resin filling portion 62b. A polyphthalamide resin may be used as the insulating base material of the MID substrate 60.
In this reference exampleSince a copper plate is used as the metal plate 11, the adhesion between the metal plate 11 and the insulating base material in the MID substrate 60 is improved as compared with the case where an aluminum plate is used as the metal plate 11, and the LED chip. 1 can be efficiently dissipated to the outside (that is, heat dissipation is improved).
by the way,In this reference example, Reference Example 1 andSimilarly, a blue LED chip is used as the LED chip 1, but copper has a low reflectance with respect to the blue wavelength, so that the efficiency of taking out the light from the LED chip 1 to the outside is reduced. The reflective film 17 made of aluminum having higher reflectivity than copper is formed on the bottom surface and the inner peripheral surface of the storage recess 11b. Therefore, a light-emitting device with high heat dissipation and high light extraction efficiency can be realized. In addition,In this reference exampleAdopts aluminum as the material of the reflective film 17 formed on the bottom surface and the inner peripheral surface of the storage recess 11b.ingHowever, it is not limited to aluminum, and for example, silver may be employed. When silver is employed, it may be formed by, for example, silver plating.
ButIn this reference exampleSince the reflective film 17 made of a metal material having a higher reflectance than the metal plate 11 is formed on the inner peripheral surface of the storage recess 11b, the choice of the material of the metal plate 11 can be increased. As the material, a material having higher adhesion to the insulating base material of the MID substrate 60 or a material having high heat dissipation can be selected.
The basic configuration of the light emitting device of the present embodiment is substantially the same as that of the second embodiment, except that a reflective film 33 made of aluminum is formed on the inner peripheral surface 31 of the frame member 30 as shown in FIG. To do. Here, aluminum is used as the material of the reflection film 33.ingHowever, it is not limited to aluminum, and for example, silver may be employed. When silver is employed, it may be formed by, for example, silver plating.
In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 2, and description is abbreviate | omitted. Also in this embodiment, as in the second embodiment, the thickness of the metal plate 11 is 0.6 mm, the diameter of each protrusion 11 a is 1 mm, and the protrusion height (protrusion amount) of each protrusion 11 a is 0.3 mm. The depth of each storage recess 11b is 0.3 mm, and the diameter of the bottom surface of each storage recess 11b is set to 0.7 mm. On the other hand, the thickness of the printed circuit board 12 is set to 0.3 mm. The LED chip 1 is set to a chip size of 350 μm □ and a thickness of 80 μm so that the LED chip 1 can be placed on the bottom surface of the storage recess 11b. The frame member 30 has an inner diameter of 3 mm and a thickness of 1 mm.
By the way, when the diffusing material and the phosphor particles are not dispersed in the sealing resin, most of the light emitted from the LED chip 1 is extracted outside without being irradiated on the inner peripheral surface 31 of the frame member 30. On the other hand, in the light emitting device of this embodiment, the diffusing material is dispersed in the sealing resin of the resin sealing portion 50, and the light emitted from the LED chip 1 is scattered by the diffusing material while the resin sealing portion. The reflection film 33 is formed on the inner peripheral surface 31 of the frame member 30, but the light scattered by the diffusing material is not directly irradiated on the inner peripheral surface of the frame member 30, but the reflection film 33. The light is reflected and extracted to the outside, and the light extraction efficiency can be increased.
The basic configuration of the light emitting device of this embodiment is substantially the same as that of the second embodiment. As shown in FIG. 10, the light emitting device is joined to the front side of the printed circuit board 12 that is an insulating base material together with the frame member 30. The difference is that a printed circuit board 70 made of a glass epoxy board is provided. The printed circuit board 70 is provided with a wiring portion (wiring pattern) 71 made of copper foil on the front surface, and the rear surface (back surface) is bonded to the printed circuit board 12. The printed circuit board 70 has a window hole 70a formed in a portion corresponding to the frame member 30, and a wiring portion 71 provided on the front surface of the printed circuit board 70 is formed along the inner peripheral surface of the window hole 70a. It extends to a position where it contacts the wiring portion 12a. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 2, and description is abbreviate | omitted.
The printed circuit board 70 and the frame member 30 are set to have substantially the same thickness. In other words, the thickness of the printed circuit board 70 is set so that the frame member 30 does not protrude forward from the printed circuit board 70. In the present embodiment, the printed circuit board 70 constitutes a circuit component mounting substrate.
By the way, when mounting circuit components such as resistors and transistors by the reflow process, it is necessary to apply solder to only the mounting locations of the circuit components using a mask. In the light emitting device of the second embodiment, FIG. As shown, the front surface is not flat and the frame member 30 protrudes from the front side of the printed circuit board 12, and it is difficult to cover the front side of the printed circuit board 12 with a mask.
In contrast, in the present embodiment, as described above, the thickness of the printed circuit board 70 and the thickness of the frame member 30 are set to be substantially equal, and the front surface of the printed circuit board 70 and the front surface of the frame member 30 are Since they are substantially aligned, the surface-mounted circuit component 5 can be easily mounted on the front side of the printed circuit board 70 by the reflow process.
In the present embodiment, the printed circuit board 70 made of a glass epoxy board is used as the circuit component mounting base material. However, the circuit component mounting base material is not limited to the glass epoxy board. What is necessary is just to be formed with the property material. In the present embodiment, the thickness of the printed circuit board 70 as the circuit component mounting base material and the thickness of the frame member 30 are set to be approximately equal. However, the thickness of the printed circuit board 70 is made larger than the thickness of the frame member 30. However, the mask can be put on the printed circuit board 70, and the circuit component 5 can be easily mounted by the reflow process.
By the way, in the example shown in FIG. 10, the printed circuit board 70 and the frame member 30 as the circuit component mounting base material are overlapped and joined to the printed circuit board 12 as the insulating base material, but as shown in FIG. The printed circuit board 70 may be provided with a resin filling portion 72 that communicates with the insertion hole 13 of the printed circuit board 12 and is filled with a sealing resin so that the printed circuit board 70 is also used as a frame member. A part of the wiring part 71 on the front surface of the printed circuit board 70 is extended to the back surface through the through hole 73 and is electrically connected to the wiring part 12 a on the front surface of the printed circuit board 12.
By adopting the configuration shown in FIG. 11, circuit components 5 such as resistors and transistors can be easily mounted by a reflow process, as in the configuration shown in FIG. Furthermore, since it is not necessary to attach the frame member 30 (see FIG. 10) individually corresponding to each insertion hole 13 of the printed circuit 12 which is an insulating base material, the assembly process can be simplified, and the frame member 30 and the insertion hole 13 can be simplified. Positioning is also easy.
In the configuration shown in FIG. 11, as shown in FIG. 12, a reflection made of a material having a higher reflectance than the printed circuit board 70 on the inner peripheral surface of the resin filling portion 72 of the printed circuit board 70 that is a circuit component mounting substrate. If the film | membrane 74 is formed, the function as a frame member can be improved and the light of the LED chip 1 can be taken out efficiently outside. In the present embodiment, the reflective film 74 is formed by through-hole plating. However, the reflective film 74 is not limited to through-hole plating. For example, a white paint having a higher reflectance than the printed circuit board 70 is used in the resin-filled portion 72. You may form by apply | coating to a surrounding surface.
The basic configuration of the light emitting device according to the present embodiment is substantially the same as that of the second embodiment. As shown in FIG. 13, as shown in FIG. 18 is characteristic. However, the wiring portion 12 a (portion used for connection with the LED chip 1) formed on the front surface of the printed circuit board 12 is not covered with the reflecting member 18. The reflecting member 18 may be formed of a material having a higher reflectance than the printed circuit board 12. In this embodiment, white silk for silk printing is used as the material of the reflecting member 18. FIG. 13A corresponds to the B-B ′ cross section of FIG. 13B (however, FIG. 13B is a schematic plan view in a state where the sealing resin is not filled). Moreover, the same code | symbol is attached | subjected to the component similar to Embodiment 2, and description is abbreviate | omitted.
Thus, in the light emitting device of the present embodiment, the reflective member 18 having a higher reflectance than the printed circuit board 12 is provided on the front side of the printed circuit board 12 that is an insulating base material inside the frame member 30. The extraction efficiency of the light emitted from 1 to the outside can be further improved.
In the present embodiment, white silk for silk printing is used as the material of the reflecting member 18, but the material is not limited to white silk, and for example, a metal film having a higher reflectance than that of an insulating base material may be used.
The basic configuration of the light emitting device of the present embodiment is substantially the same as that of the second embodiment. As shown in FIG. 14, the inner peripheral surface of the storage recess 11b provided in the protruding portion 11a of the metal plate 11 is a paraboloid of revolution. There is a feature in the point which consists of a part. Moreover, in this embodiment, the mounting part 11c which protrudes ahead from a bottom face and arrange | positions the LED chip 1 in the bottom part of the storage recess 11b is integrally protrudingly provided. Here, the storage recess 11 b is located at the center of the light emitting layer in the light emitting part of the LED chip 1 with the rotation center axis of the paraboloid passing through the center of the opening. That is, the amount of protrusion of the mounting portion 11 c is set so that the focal point of the paraboloid of revolution is located at the center of the light emitting layer in the light emitting portion of the LED chip 1. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 2, and description is abbreviate | omitted.
Thus, in the light emitting device of this embodiment, in particular, the light emitted from the side surface of the LED chip 1 can be efficiently reflected to the front side of the light emitting device, and the light extraction efficiency to the outside of the light emitting device can be improved. Can do.
By the way, in the example shown in FIG. 14, the area of the front surface of the mounting portion 11c on which the LED chip 1 is mounted is set to be approximately the same as or slightly larger than the chip area of the LED chip 1 (the area of the rear surface of the LED chip 1). However, as shown in FIG. 15, if the area of the front surface of the mounting portion 11 c is made smaller than the chip area of the LED chip 1, part of the light emitted to the rear of the LED chip 1 is also efficiently emitted. The light can be reflected to the front side of the apparatus, and the light extraction efficiency can be further improved as compared with the configuration of FIG.
Before explaining the light emitting device of this embodiment, reference shown in FIG.Example 5explain. The basic configuration of the light emitting device having the configuration shown in FIG. 17 is substantially the same as that of the second embodiment shown in FIG. 2, and an area that does not overlap with the metal plate 11 is provided in the printed circuit board 12. The mounting circuit components 5 are mounted together. By adopting the configuration shown in FIG. 17, there is an advantage that even if the circuit component 5 is a lead mounting type circuit component, it can be mounted without risking a short circuit via the metal plate 11.
The basic configuration of the light emitting device of this embodiment is shown in FIG.Example 5 andAs shown in FIG. 16, the printed circuit board 12 is provided with a region that does not overlap the metal plate 11, and the lead-mounted circuit components 5 are collectively mounted on the rear side of the region. It is in. Here, the wiring portion 12a on the front surface of the printed circuit board 12 is extended to the rear surface of the region through the through hole 14 and is appropriately connected to the leads of the circuit components 5.
Thus, in the light emitting device of this embodiment, the reference shown in FIG.Example 5 andSimilarly, even if the circuit component 5 is a lead mounting type circuit component 5, there is an advantage that the circuit component 5 can be mounted without risking a short circuit via the metal plate 11, and the light emitted from the LED chip 1 is not affected. There is an advantage that the efficiency of taking out the light emitted from the LED chip 1 to the outside can be further improved without being absorbed or reflected by the circuit component 5.
The invention of claim 1 projects forward.Multiple bumpsThere is an exit andEach bumpA metal plate with a storage recess formed in the front of the outlet, Each yieldBottom of recessArranged so that each pad is on the top sideThermally bonded to the metal plateMultiple departuresWith photodiode chip, Each clashOutingEach insertedEnteredMultiple insertionsInsulating base material joined to the metal plate in the form of a hole and overlapped with the metal plate, and has translucencyEach departureIt consists of a sealing resin that seals the photodiode chip.Multiple treesWith an oil seal,, Each departurePhotodiode chipAnd power through the bonding wireFrom the printed circuit board where the wiring part to be electrically connected is formed on the surface opposite to the metal plate sideThe thickness of the printed circuit board is the same as the protruding height of the protruding portion of the metal plate, andPhoto diode chipEachSince it is located at the bottom of the storage recess and is thermally coupled to the metal plate (ieMultiple departuresSince the photodiode chip is mounted directly on the metal plate), heat dissipation is improved compared to the conventional one mounted via an insulating layer, and the luminous efficiency decreases due to the temperature rise of the LED chip, and the lifetime decreases. This has the effect of suppressing the degradation of the sealing resin, and the light emitted from the light-emitting diode chip is reflected by the inner peripheral surface of the storage recess and taken out of the storage recess. There is an effect that the light of the diode chip can be extracted efficiently, and the reflection performance is deteriorated during heating in the mounting process of the light emitting diode chip, or the reflection performance is deteriorated due to irradiation of the light of the light emitting diode chip. There is an effect that can be suppressed.
According to a second aspect of the present invention, in the first aspect of the invention, since the insulating base is provided with a resin filling portion filled with at least a part of the sealing resin, an epoxy resin or the like is used as the sealing resin. There exists an effect that it can seal easily using resin for molds, such as silicone resin.
The invention of claim 3 is the invention of claim 2, further comprising a frame-shaped frame member that is joined in a form overlapped on the front surface side of the insulating base material and surrounds the entire periphery of the insertion hole. Since the resin is filled inside the resin filling portion and the frame member, the space for filling the sealing resin can be easily and inexpensively formed.
Claim4In the invention of claim 3, in the invention of claim 3, since a reflective film made of a metal material having a higher reflectance than the frame member is formed on the inner peripheral surface of the frame member, the light emitted from the light emitting diode chip There is an effect that it is possible to improve the efficiency of taking out to the outside.
Claim6According to the invention of claim 3, since a reflecting member having a higher reflectance than the insulating base is provided on the front side of the insulating base inside the frame member, the light is emitted from the light emitting diode chip. There is an effect that it is possible to further improve the efficiency of taking out the emitted light to the outside.
FIG. 1 is a schematic cross-sectional view showing a first embodiment.
FIG. 2 is a schematic cross-sectional view showing a second embodiment.
FIG. 3 is a schematic cross-sectional view showing a reference example in the same as above.
[Fig. 4]Reference Example 1It is a schematic sectional drawing shown.
FIG. 5 is a schematic cross-sectional view showing another configuration example of the above.
[Fig. 6]Reference example 2It is a schematic sectional drawing shown.
[Fig. 7]Reference Example 3It is a schematic sectional drawing shown.
[Fig. 8]Reference Example 4It is a schematic sectional drawing shown.
FIG. 93It is a schematic sectional drawing which shows.
FIG. 10 is an embodiment.4It is a schematic sectional drawing which shows.
FIG. 11 is a schematic cross-sectional view showing another configuration example same as above.
FIG. 12 is a schematic cross-sectional view showing another configuration example same as above.
FIG. 13 is an embodiment.5(A) is schematic sectional drawing, (b) is a schematic plan view before resin sealing.
FIG. 14 is an embodiment.6It is a schematic sectional drawing which shows.
FIG. 15 is a schematic cross-sectional view showing another configuration example same as above.
FIG. 16 shows an embodiment.7It is a schematic sectional drawing which shows.
[Figure 17] Same as aboveExample 5It is a schematic sectional drawing shown.
18A and 18B show a conventional example, in which FIG. 18A is a schematic sectional view, and FIG. 18B is an enlarged view of a main part A of FIG.
1 Light emitting diode chip (LED chip)
11 Metal plate
11b Storage recess
12a Wiring part
50 Resin sealing part
W Bonding wire
A metal plate in which a plurality of collision detecting portion is housed recess on the front of且one Kaku突 out portion is provided is formed which protrudes forward, arranged in the form of each pad is the top side to the bottom of KakuOsamu paid recess a plurality of light-emitting diodes chips thermally coupled to the metal plate is, joined to the metal plate in the form of the collision detecting portion is superimposed on a plurality of interpolation in hole is formed a metal plate that will be inserted, respectively comprising an insulating substrate and a plurality of tree Aburafutome portion ing from the sealing resin that seals Kakuhatsu light diode chips have a light-transmitting, insulating substrate, each light-emitting diodes chips and bonding wires wiring portion which is gas-connected conductive via is a printed circuit board formed on the surface opposite to the metal plate side, the thickness of the printed circuit board is the same as the protrusion height of the protruding portion of the metal plate the light emitting device characterized in that it.
The light-emitting device according to claim 1, wherein the insulating base is provided with a resin filling portion in which at least a part of the sealing resin is filled.
A frame-shaped frame member that is joined to the front side of the insulating base material so as to overlap the entire circumference of the insertion hole, and the sealing resin is filled inside the resin filling portion and the frame member. The light-emitting device according to claim 2.
The light emitting device according to claim 3, wherein a reflective film made of a metal material having a higher reflectance than the frame member is formed on an inner peripheral surface of the frame member.
A circuit component mounting base material is provided which is joined to the front side of the insulating base material together with the frame member and has a wiring portion provided on the front side. The light-emitting device according to claim 3, wherein the light-emitting device has a thickness that does not protrude forward from the component mounting substrate.
The light emitting device according to claim 3, wherein a reflective member having a higher reflectance than the insulating base material is provided on a front side of the insulating base material inside the frame member.
The light emitting device according to claim 1, wherein an inner peripheral surface of the storage recess is a part of a paraboloid of revolution.
The light emitting device according to claim 1, wherein the insulating base is provided with a region that does not overlap the metal plate, and a circuit component is mounted on a rear surface side of the region.
JP2001340832A 2001-08-28 2001-11-06 Light emitting device Active JP4045781B2 (en)
US10/466,114 US6930332B2 (en) 2001-08-28 2002-08-28 Light emitting device using LED
CNB028027329A CN1220285C (en) 2001-08-28 2002-08-28 Light emitting device using LED
EP02762899A EP1439584B1 (en) 2001-08-28 2002-08-28 Light emitting device using led
TW091119625A TW556364B (en) 2001-08-28 2002-08-28 Light emitting device using LED
JP2003152225A JP2003152225A (en) 2003-05-23
JP4045781B2 true JP4045781B2 (en) 2008-02-13
JP2001340832A Active JP4045781B2 (en) 2001-08-28 2001-11-06 Light emitting device
JP5441316B2 (en) * 2007-04-05 2014-03-12 ローム株式会社 Semiconductor light emitting device
JP5238366B2 (en) * 2008-06-09 2013-07-17 スタンレー電気株式会社 Semiconductor light emitting device
EP1566846A2 (en) 2005-08-24 Optoelectronic device
2007-11-30 R151 Written notification of patent or utility model registration
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