JP2010157682A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device improved in reliability for a sealability and a temperature cycle. <P>SOLUTION: This electronic device includes: a glass base material 2 having a front surface 2a and a back surface 2b; an electronic component 4 mounted on the front surface 2a of the glass base material 2, and a lead frame LF penetrating from the back surface 2b of the glass base material 2 to the front surface 2a of the glass base material 2. The lead frame LF is jointed to the back surface 2b of the glass base material 2 to form back electrodes 3a, 3b, and bent parts penetrate from the back surface 2b to the front surface 2a to form through electrodes 9a, 9b of which the tips are exposed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic device using a glass substrate on which a through electrode is formed as a package material.

  In recent years, electronic parts using glass packages have been put into practical use. Glass materials are highly airtight to prevent moisture and contaminants entering from the outside. In addition, since the glass material has a thermal expansion coefficient close to that of a silicon substrate on which a semiconductor element is formed, the reliability of the mounting surface and the bonding surface when the semiconductor element is mounted on the glass package is high. Further, since the glass material is inexpensive, an increase in the cost of the product can be suppressed.

  FIG. 23 is a cross-sectional view of an LED light emitting device in which an LED element is mounted on a glass material (FIG. 1 of Patent Document 1). A through electrode 52 is formed on the glass substrate 51. A connection electrode metallized 53b is formed on the through electrode 52, and a plurality of LED elements 56a are mounted on the electrode metallized 53b. The upper surface of the LED element 56 a and the electrode metallized 53 b are electrically connected by a wire 57. On the lower surface of the glass substrate 51, an electrode metallized 53a for connection with the outside is formed. The electrode metallized 53 a is electrically connected to the through electrode 52. Therefore, electric power can be supplied to the LED element 56a from the electrode metallized 53a formed on the lower surface.

  On the upper surface of the glass substrate 51, an Si substrate 54 in which a through hole 58 is formed is installed so as to surround the LED element 56a. The Si substrate 54 is anodically bonded to the surface of the glass substrate 51. The inner wall surface of the Si substrate 54 is inclined, and a reflection film 55 is formed on the surface thereof. The light emitted from the LED element 56a is reflected by the reflection film 55 and emitted as light having directivity in the upward direction. Since a plurality of LED elements 56a are mounted, the intensity of light emission can be increased. The heat generated from the LED element 56a can be radiated to the outside through the through electrode 52 and the electrode metallized 53a.

  In this conventional example, the through electrode 52 of the glass substrate 51 is formed by plating Cu, Ni or the like on the inner wall of the through hole formed in the glass substrate 51 and then filling with a conductive resin or solder. Further, the metallized 53a on the back surface of the glass substrate 51 is formed by sputtering a Ti layer on the glass surface, a Pt layer serving as a barrier layer for protecting the Ti layer, or a Ni layer, and an Au layer for preventing surface oxidation. It is deposited by a method or a vapor deposition method and patterned through a photo process.

  FIG. 24 is a cross-sectional view of a surface-mounted LED 60 in which an LED element is mounted on a printed board (FIG. 1 of Patent Document 2). A blue LED 68 is mounted on the printed board 63. A lamp house 66 having a reflective surface 64 is bonded onto the printed board 63, a blue LED 68 is mounted on the bottom surface 67 of the cup 65 of the lamp house 66, and the cup 65 is filled with a silicon resin 71. Circuit conductors 62 are formed from the surface of the printed circuit board 63, that is, from the surface on which the LEDs 68 are mounted to the side and back surfaces. This structure is manufactured as a relatively inexpensive LED device, and a glass epoxy material or a polymer material is used as the printed board 63 or the cup 65.

JP 2007-42781 A JP 2005-229048 A

  However, as described in Patent Document 1, when the through hole was filled with a conductive resin and solidified by heat treatment to form the through electrode 52, the conductive resin contracted during the solidification. Therefore, it is difficult to form the through electrode 52 having sufficiently high airtightness. Further, the LED generates heat when it emits light. Therefore, when the LED is repeatedly turned on and off, the temperature increase and the temperature decrease are repeated. Due to this temperature cycle, the glass substrate 51 and the through electrode 52 repeatedly expand and contract, whereby the confidentiality at the interface between the glass substrate 51 and the through electrode 52 is broken, and moisture and the like enter from the outside, reducing the life of the LED. I let you.

  Further, the through electrode 52 and the back electrode 53a described in Patent Document 1 form a through electrode by filling and solidifying a conductive resin or solder in the through hole, and separately from this, a sputtering method or a vapor deposition method is used. A conductive film is deposited by the above, and a pattern is formed through a photo process using a photomask to form a back electrode. For this reason, the number of manufacturing steps is increased and the cost is increased.

  Further, when a package is formed using a glass epoxy material or a polymer material, for example, the reflective surface 64 is discolored due to use for a long time, and the reflected light rate is reduced. Further, in the method of drawing the circuit conductor 62 to the side surface of the printed circuit board 63, the manufacturing method is a single wafer type, and it has been difficult to improve productivity by taking a large number of pieces.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic device capable of solving the above-described problems and manufacturing a highly reliable electronic device with a small number of manufacturing steps.

  The electronic device of the present invention includes a glass substrate having a front surface and a back surface, a lead frame penetrating from the back surface of the glass substrate to the surface, and an electronic component mounted on the surface of the glass substrate. The lead frame is bonded to the back surface of the glass base material to form a back electrode, and is bent from the back surface to penetrate to the front surface, and its leading end is exposed on the surface of the glass base material to form the through electrode. The electronic component is mounted so as to be electrically connected to the leading end portion of the lead frame.

Here, the difference in thermal expansion coefficient between the glass substrate and the lead frame was set to 4 × 10 ⁻⁶ / K (K is Kelvin) or less. The thermal expansion coefficient of the glass substrate is 8 × 10 ⁻⁶ / K to 11 × 10 ⁻⁶ / K, and the thermal expansion coefficient of the lead frame is 4 × 10 ⁻⁶ to 15 × 10 ⁻⁶ / K. .

  Further, the lead frame was formed of an alloy containing Ni and Fe. Alternatively, the lead frame was formed of a clad material joined with metals of different materials. The clad material contains a metal containing Cu as a component.

  A thin film made of Au was formed on the lead frame. Further, an oxide film made of an oxide of a metal material constituting the lead frame is formed on the joint surface between the lead frame and the glass substrate.

  A plurality of lead frames are provided so as to be electrically separated from each other. Among the plurality of lead frames, an electronic component is mounted on the leading end portion of one lead frame, and the leading end portion of the other lead frame is mounted. An electronic component is not mounted on the lead electrode, and the cross-sectional area of the through electrode of one lead frame in a plane orthogonal to the direction of current flow is larger than the cross-sectional area of the through electrode of the other lead frame. Further, the line width of the back electrode constituted by one lead frame is wider than the line width of the back electrode constituted by the other lead frame.

  Moreover, the back surface electrode comprised by a lead frame is an area which does not exceed 50% with respect to the total area of the back surface of a glass base material.

  Moreover, the front-end | tip part exposed to the surface of a glass base material and the surface of the glass base material of the vicinity of a front-end | tip part comprise the recessed part which became depressed rather than the surrounding surface. The recess is filled with a conductor containing metal particles. The conductor was formed from nano metal particles.

  Moreover, the back surface electrode comprised with a lead frame had the recessed part recessed with respect to the back surface side of a glass base material, and filled the glass base material in this recessed part. In addition, the back electrode constituted by the lead frame has a narrowed portion where the electrode width becomes narrow.

  In addition, the tip portion of the lead frame constitutes a surface electrode that is bonded to the surface of the glass substrate.

  In addition, the cross-sectional area of the through electrode in the plane perpendicular to the direction in which the current flows is smaller than the cross-sectional area in the plane orthogonal to the direction in which the current flows through the back electrode connected to the through electrode. I did it.

  In addition, a depression was formed on the surface of the glass substrate, and the tip of the lead frame was exposed at the bottom of the depression, and the electronic component was made of a light emitting diode, and the light emitting diode was mounted on the bottom of the depression.

  An electronic device of the present invention comprises a glass substrate having a front surface and a back surface, an electronic component mounted on the surface of the glass substrate, and a lead frame penetrating from the back surface of the glass substrate to the surface of the glass substrate. The lead frame was bonded to the back surface of the glass substrate to form a back electrode, and the lead electrode formed a through electrode in which a bent portion penetrated from the back surface to the surface and the tip portion was exposed. As a result, it is possible to provide an electronic device that can improve hermeticity and reliability with respect to a temperature cycle and can be manufactured with a small number of manufacturing steps.

1 is a schematic longitudinal sectional view of an electronic device according to an embodiment of the present invention. 1 is a schematic longitudinal sectional view of an electronic device according to an embodiment of the present invention. 1 is a schematic longitudinal sectional view of an electronic device according to an embodiment of the present invention. It is a schematic diagram for demonstrating the electronic device which concerns on embodiment of this invention. 1 is a schematic longitudinal sectional view of an electronic device according to an embodiment of the present invention. 1 is a schematic plan view of an electronic device according to an embodiment of the present invention. It is a schematic diagram of the electronic device which concerns on embodiment of this invention. It is a schematic diagram of the electronic device which concerns on embodiment of this invention. It is a schematic diagram of the electronic device which concerns on embodiment of this invention. 1 is a schematic longitudinal sectional view of an electronic device according to an embodiment of the present invention. It is explanatory drawing showing the manufacturing method of an electronic device. It is explanatory drawing showing the manufacturing method of an electronic device. It is explanatory drawing showing the manufacturing method of an electronic device. It is explanatory drawing showing the manufacturing method of an electronic device. It is explanatory drawing showing the manufacturing method of an electronic device. It is explanatory drawing showing the manufacturing method of an electronic device. It is explanatory drawing showing the manufacturing method of an electronic device. It is typical process drawing for demonstrating the manufacturing method of an electronic device. It is typical process drawing for demonstrating the manufacturing method of an electronic device. It is a schematic diagram for demonstrating the manufacturing method of an electronic device. It is a schematic diagram for demonstrating the manufacturing method of an electronic device. It is a schematic diagram for demonstrating the manufacturing method of an electronic device. It is sectional drawing of the LED light-emitting device which mounted the conventionally well-known LED element. It is sectional drawing of a conventionally well-known surface mount type LED.

  Hereinafter, the electronic device of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic longitudinal sectional view of an electronic device 1 according to the first embodiment of the present invention. In the first embodiment, the electronic component 4 is an LED, and the electronic device 1 is an LED light emitting device. A glass substrate 2 made of soda glass or the like, a lead frame LF that is bonded to the back surface of the glass substrate 2 and penetrates from the back surface to the surface of the glass substrate 2, and is mounted on the surface of the glass substrate 2. It is comprised from the electronic component 4 which consists of LED. The lead frame LF is joined to the back surface 2b of the glass substrate 2 to form the back electrodes 3a and 3b, and the bent portion formed by bending further penetrates from the back surface 2b of the glass substrate 2 to the front surface 2a. The through-electrodes 9a and 9b are formed with the tip portions exposed. Here, the lead frame refers to a conductor formed integrally from a thin plate or wire metal or alloy. Therefore, it may be a conductor formed by etching or punching a tape-like metal plate used in the semiconductor field, or may be a linear conductor formed by stretching a metal or the like.

  A depression 7 is formed on the surface of the glass substrate 2. Although this hollow 7 is demonstrated in detail later, the glass base material 2 is formed with the shaping | molding method. The electronic component 4 is surface-mounted on the bottom surface of the recess 7, that is, on the surface 2 a of the glass substrate 2. The electronic component 4 is electrically connected to the through electrode 9a immediately below it and the through electrode 9b connected by the wire 5 made of Au. The recess 7 of the glass substrate 2 is filled with a sealing material 6 and sealed so that the electronic component 4 and the wire 5 do not come into contact with the outside air. The inner wall surface of the recess 7 is inclined and reflects light emitted from the LED upward.

  When power is supplied to the back electrodes 3a and 3b to cause the LED as the electronic component 4 to emit light, the LED generates heat. This heat is radiated to the outside through the lead frame LFa, that is, the through electrode 9a and the back electrode 3a. Therefore, the lead frame LFa is a power supply unit and a heat dissipation unit for the LED.

Here, it is preferable that the difference in thermal expansion coefficient between the glass substrate 2 and the lead frame LF is 4 × 10 ⁻⁶ / K or less. By setting the difference in thermal expansion coefficient to 4 × 10 ⁻⁶ / K or less, even when the mounted electronic component 4 is exposed to a heat cycle due to heat generation, the bonding between the lead frame LF and the glass substrate 2 is maintained, and the through electrode The airtightness between 9a, 9b and the glass substrate 2 is maintained. Thereby, the reliability of the mounted electronic component 4 can be improved.

The thermal expansion coefficient of the glass substrate 2 is 8 × 10 ⁻⁶ / K to 11 × 10 ⁻⁶ / K, and the thermal expansion coefficient of the lead frame LF is 4 × 10 ⁻⁶ to 15 × 10 ⁻⁶ / K. To do. Thereby, the range of the thermal expansion coefficient of the lead frame LF can be expanded and the range of the material of the available lead frame LF can be expanded without greatly increasing the difference in thermal expansion coefficient with the glass substrate 2. .

  NiFe alloy or Kovar can be used as the lead frame LF. For example, a 42% NiFe alloy or a 45% NiFe alloy can be used. The thermal expansion coefficient is close to that of a glass material, and the bondability with the glass material is good. Also, soldering is facilitated by applying Ni or Au plating to the surfaces of the back electrodes 3a and 3b constituted by the lead frame LF. The lead frame LF has a thickness of approximately 0.1 mm to 0.5 mm.

  In the first embodiment in which an LED is used as the electronic component 4, a reflective surface can be configured by forming a multilayer film of metal or insulator on the inclined surface of the recess 7. Thereby, the light emission from LED can be efficiently reflected upward. Further, instead of forming a reflective film, a material exhibiting white or milky white may be used as the glass substrate 2. If the glass substrate 2 is white or milky white, there is an advantage that the color does not change even when used for a long time. For example, by mixing an oxide such as phosphoric acid (P2O5), alumina (Al2O3), calcium oxide (CaO), boron oxide (B2O3), magnesium oxide (MgO), barium oxide (BaO) into a glass material, can do.

  In addition, an oxide film made of an oxide of a metal material constituting the lead frame is interposed on the joint surface between the lead frame LF and the glass substrate 2. Thereby, the adhesiveness and airtightness between the lead frame LF and the glass substrate 2 can be improved. As a result, the electronic device 1 with higher reliability can be formed.

(Second Embodiment)
FIG. 2 is a schematic longitudinal sectional view of an electronic device 1 according to the second embodiment of the present invention. The difference of this embodiment from the first embodiment is that a clad material is used as the lead frame LF, and the rest is the same as in the first embodiment, and the description thereof is omitted.

A clad material in which two or more different metals are bonded together can be used as the lead frame FL. For example, the first layer is made of NiFe alloys 3ax, 3bx (9ax, 9bx for the through electrode 9a), and Cu3ay, 3by (9bx, 9by for the through electrode 9b) is bonded to the second layer. Furthermore, a NiFe alloy can be bonded to the third layer. In this way, the thermal expansion coefficient is close to the glass substrate 2, for example the difference in thermal expansion coefficient of 4 × 10 -6 ^{/ K} or less, can be electrical resistance is small, and high thermal conductivity . Thereby, the voltage drop at the time of supplying electric power to the electronic component 4 can be reduced. Furthermore, the heat generated in the electronic component 4 can be efficiently radiated through the lead frame LF. Further, if the first layer of the lead frame FL is made of NiFe alloy and the second layer is made of Cu, soldering to the lead frame LF as the back electrode can be performed. Moreover, even when the NiFe alloy is exposed to the outside, soldering is facilitated by performing a Cu or Au plating process.

(Third embodiment)
FIG. 3 is a schematic longitudinal sectional view of an electronic device 1 according to the third embodiment of the present invention. This embodiment is different from the first embodiment in that when the bent portions formed by bending the lead frame LF are the through electrodes 9a and 9b, the tip 9c where the through electrode 9a is exposed on the surface and the vicinity of the tip The surface 2c of the glass substrate 2 located at is a recess recessed with respect to the surrounding surface 2a, and this recess is filled with conductors 8a and 8b. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  The through electrodes 9 a and 9 b are embedded in the glass substrate 2 so that the tips of the through electrodes 9 a and 9 b do not protrude from the surface 2 a of the glass substrate 2. Thereby, when mounting the electronic component 4 by applying stress to the bottom surface of the recess 7, it is possible to prevent the electronic component 4 from cracking due to the protrusion of the through electrode 9 a and the distortion of the electronic component 4.

  When the surface 2a of the glass substrate 2 does not have an uneven shape such as the depression 6, it is relatively easy to match the tip 9c of the through electrode 9a so as not to protrude from the surface 2a of the glass substrate 2. is there. This is because the surface of the glass substrate 2 may be polished. However, since the depression 6 is formed on the surface of the glass substrate 2 as shown in FIG. 3, the surface 2a cannot be smoothed by polishing or the like. Therefore, a recess is formed in which the tips 9c of the through electrodes 9a, 9b are slightly lower than the surface 2a of the glass substrate 2, and the recesses are filled with conductors 8a, 8b. The conductors 8a and 8b are electrically connected to an electrode (not shown) formed on the back surface of the electronic component 4, and the electronic component 4 and the through electrode 9a are electrically connected.

  The conductors 8a and 8b can be formed by heat-treating nano metal particles. The nano metal particle means a metal particle having a particle diameter of several nanometers to several tens of nanometers. The heat treatment of the nano metal particles is performed at a temperature of 100 ° C to 600 ° C. As the nano metal particles, for example, nano Ag particles, nano Au particles, and nano Cu particles can be used. The nano metal particles are dispersed in a solvent, filled in the recesses by a dispensing method or an ink jet printing method, and heat treated to form conductors 8a and 8b. Nano metal particles have an extremely large surface area compared to other metal particles and bulk. For this reason, when the metal film is formed by baking after applying the nano metal particles, the adhesion to the substrate surface is improved.

(Fourth embodiment)
FIG. 4 is a schematic view for explaining an electronic device 1 according to a fourth embodiment of the present invention. FIG. 4A is a plan view of the electronic device 1 as viewed from above, and FIG. These are the top views which looked at the electronic device 1 from the downward direction. In the present embodiment, the back electrode 3a has a lead portion in which the electrode width is wider than the electrode width of the back electrode 3b. In FIG. 4A, the electronic component 4 is indicated by a broken line so that the state of the recess 16 for filling the through electrode 9 and the conductor 8 can be seen. In this example, an LED is mounted as the electronic component 4.

  As shown in FIG. 4A, a depression 7 is formed on the upper surface of the glass substrate 2. Concave portions 16 a and 16 b are formed on the bottom surface of the recess 7, and the through electrodes 9 a and 9 b are exposed at the center. The recesses 16a and 16b are filled with conductors 8a and 8b. The electronic component 4 is mounted on the through electrode 9a. An electrode (not shown) is formed on the back surface of the electronic component 4 and is electrically connected to the through electrode 9a through the conductor 8a. An electrode (not shown) is formed on the surface of the electronic component 4, and this electrode and the through electrode 9b are electrically connected via a wire 5 and a conductor 8b (not shown).

  Here, the cross-sectional area Sa of the through-electrode 9a on which the electronic component 4 is mounted, that is, the cross-sectional area Sa of the through-electrode 9a in a plane orthogonal to the direction in which the current flows is not mounted on the electronic component 4 The cross-sectional area of the through-electrode 9b, that is, the cross-sectional area Sb of the through-electrode 9b in a plane orthogonal to the direction of current flow is formed. Thereby, the heat generated in the electronic component 4 can be efficiently transmitted to the back surface.

  As shown in FIG. 4B, back electrodes 3 a and 3 b are formed on the back surface of the glass substrate 2. The back electrode 3a is bent at the center and connected to the through electrode 9a. The back electrode 3b is bent at a portion on the right side from the center and connected to the through electrode 9b. The through electrode 9 a is located below the electronic component 4.

  Here, the line width Wa of the lead portion of the back electrode 3a is formed wider than the line width Wb of the lead portion of the back electrode 3b. Thereby, the heat transmitted through the through electrode 9a can be efficiently transmitted to the end of the glass substrate 2 to be dissipated. Furthermore, heat dissipation efficiency can be further improved by connecting a heat dissipation fin or the like to the back electrode 3a. Note that the back electrode 3a may be thicker than the back electrode 3b, and the line width Wa of the electrode may be equal to or narrower than Wb. In short, the cross-sectional area of the lead portion of the back electrode 3a on the surface orthogonal to the direction in which the current flows may be formed wider than the cross-sectional area of the lead portion of the back electrode 3b.

  In addition, the total area of the back electrodes 3 a and 3 b is preferably 50% or less with respect to the total area of the back surface of the glass substrate 2. Thereby, it can prevent that the back surface electrodes 3a and 3b peel from the glass base material 2, and can reduce that the glass base material 2 curves. It is extremely difficult to make the thermal expansion coefficient of the lead frame LF constituting the back electrodes 3a and 3b completely coincide with the thermal expansion coefficient of the glass substrate 2. When the electronic component 4 generates heat, stress is applied to the back electrodes 3a and 3b, and the glass substrate 2 is peeled off from the back surface or the glass substrate 2 is curved. By reducing the bonding area, electrode peeling and glass substrate warpage 2 can be prevented or reduced.

(Fifth embodiment)
FIG. 5 is a schematic longitudinal sectional view of an electronic device 1 according to the fifth embodiment of the present invention. The difference from the first embodiment of FIG. 1 is that the back surface electrodes 3a and 3b formed of the lead frame LF have recesses 17a and 17b that are recessed with respect to the back surface side of the glass substrate 2. . Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  As shown to Fig.5 (a), it has the recessed part 17a with respect to the back surface of the glass substrate 2 of the back surface electrode 3a, and the recessed part 17b with respect to the back surface of the glass substrate 2 of the back surface electrode 3b, and the back surface of this part The electrodes 3a and 3b are thin. Furthermore, the glass substrate 2 is filled in the recesses 17a and 17b. With this configuration, when the electronic component 4 generates heat and the glass substrate 2 is heated, the stress due to thermal expansion of the back electrodes 3a and 3b is relieved, and the glass substrate 2 is prevented from being cracked or cracked. it can. A plurality of the recesses 17a and 17b may be formed on the back electrode 3a or 3b.

  Further, as shown in FIG. 5B, the recesses 17a and 17b can be formed without making the back electrodes 3a and 3b thin. The glass substrate 2 is filled in the recesses 17a and 17b of the back electrodes 3a and 3b. Also in this case, as in FIG. 5A, when the glass substrate 2 is heated and the back electrodes 3a and 3b are thermally expanded, the stress applied to the glass substrate 2 from the back electrodes 3a and 3b is relieved. Thus, it is possible to prevent the glass substrate 2 from being cracked or cracked.

(Sixth embodiment)
FIG. 6 is a schematic plan view of an electronic device 1 according to the sixth embodiment of the present invention, and is a plan view of the electronic device 1 as viewed from below. Back electrodes 3 a and 3 b are formed on the back surface of the glass substrate 2. A depression 7 is formed on the surface of the glass substrate 2, and an electronic component 4 is mounted on the bottom surface of the depression 7. The through electrodes 9 a and 9 b penetrating from the back surface to the front surface of the glass substrate 2 are embedded in the glass substrate 2. In the lead portion of the back electrode 3a, a narrowed portion 18a having a narrow line width is formed. In the lead portion of the back electrode 3b, a narrowed portion 18b having a narrow line width is formed. Thus, by forming the constricted portions 18a and 18b in the back electrodes 3a and 3b, when the glass substrate 2 is heated and the back electrodes 3a and 3b are thermally expanded, the back electrodes 3a and 3b are transformed into the glass substrate. The stress applied to 2 can be relaxed, and the glass substrate 2 can be prevented from being cracked or cracked. A plurality of the narrowed portions 18a and 18b may be formed on the lead portion of the back surface electrode 3a or 3b.

(Seventh embodiment)
FIG. 7 is a schematic view of an electronic device 1 according to the seventh embodiment of the present invention. 7A is a plan view of the electronic device 1 as viewed from above, FIG. 7B is a longitudinal sectional view of the portion XX, and FIG. 7C is a view of the electronic device 1 as viewed from below. It is a top view. In the present embodiment, the lead frame LF constitutes the back electrodes 3a, 3b, the through electrodes 9a, 9b, and the front electrodes 30a, 30b, 30c.

  7A, a recess 7 is formed on the surface 2a of the glass substrate 2, and the bottom surface 2d of the recess 7 (the bottom surface 2d is a part of the surface 2a of the glass substrate 2. The same applies hereinafter. The surface electrodes 30a, 30b, and 30c formed by bending the leading end portion of the lead frame LF are joined to the bottom surface 2d. As shown in FIG. 7B, the surface electrodes 30a and 30c are connected to the back surface electrode 3a through the through electrodes 9a and 9c. The front surface electrode 30b is connected to the back surface electrode 3b through the through electrode 9b. The electronic component 4 is mounted on the surface electrodes 30a and 30c, and is electrically connected to an electrode (not shown) formed on the back side of the electronic component 4 and the surface electrodes 30a and 30c. An electrode (not shown) formed on the surface of the electronic component 4 and the surface electrode 30b are electrically connected by a wire (not shown). Moreover, although the hollow 7 is filled with the sealing material 6, it was abbreviate | omitted in the figure.

  As shown in FIG. 7C, the back electrodes 3 a and 3 b are bonded to the back surface of the glass substrate 2. The back electrode 3a has its lead portion branched and connected to the through electrodes 9a and 9b. Thereby, the contact area between the electronic component 4 and the surface electrodes 30a and 30c can be increased, and the entire cross-sectional area of the through-electrodes 9a and 9c, that is, the through-electrodes 9a and 9c in the plane perpendicular to the direction of current flow can be obtained. The overall cross-sectional area can be increased. Therefore, the heat generated in the electronic component 4 can be efficiently radiated to the through electrodes 9a and 9c and the back electrode 3c.

(Eighth embodiment)
FIG. 8 is a schematic view of an electronic device 1 according to the eighth embodiment of the present invention. 8A is a plan view of the electronic device 1 as viewed from above, FIG. 8B is a longitudinal sectional view of the portion YY, and FIG. 8C is a view of the electronic device 1 as viewed from below. It is a top view. The difference from the seventh embodiment is that the surface electrode 30a formed by bending the lead frame LF is formed on the entire lower surface of the electronic component 4, and the surface electrodes 30b and 30d are formed.

  As shown in FIG. 8A and FIG. 8B, a recess 7 is formed on the surface 2a of the glass substrate 2, and the bottom surface 2d of the recess 7 is formed by bending the tip of the lead frame LF. Electrodes 30a, 30b, and 30d are joined. The front surface electrode 30a is connected to the back surface electrode 3a through the through electrode 9a. The front surface electrodes 30b and 30d are connected to the back surface electrode 3b through the through electrodes 9b and 9d. The wire that connects the electronic component 4 and the surface electrode 30b and the sealing material that fills the recess 7 are omitted.

  As shown in FIG. 8C, the back electrodes 3 a and 3 b are bonded to the back surface 2 b of the glass substrate 2. The width of the lead portion of the back electrode 3a and the through electrode 9a connected thereto is the same as the width of the front electrode 30a. The lead portion of the back electrode 3b is branched and connected to the through electrodes 9b and 9d. As described above, the surface electrode 30a is formed on the entire lower surface of the electronic component 4, and the width of the lead portion of the through electrode 9a and the back electrode 3a is the same as the width of the surface electrode 30a. It is possible to efficiently dissipate the heat to the back surface 2b side. Further, since the width of the lead portion of the back electrode 3b and the effective cross-sectional area of the through electrodes 9b and 9d are increased, a large current can be passed. Therefore, large electric power can be supplied to the electronic component 4.

(Ninth embodiment)
FIG. 9 is a schematic view of an electronic device 1 according to the ninth embodiment of the present invention. FIG. 9A is a plan view of the electronic device 1 as viewed from above, and FIGS. 9B and 9C are longitudinal sectional views of the ZZ portion, showing different aspects of the through electrode 9. Represents. The difference from the eighth embodiment shown in FIG. 8 is that the effective electrode width of the through electrode 9a is narrower than the electrode width of the front electrode 30a or the back electrode 3a.

  As shown in FIG. 9A, a depression 7 is formed on the surface of the glass substrate 2, and surface electrodes 30 a, 30 b, 30 d formed by bending the tip of the lead frame LF are formed on the bottom surface 2 d of the depression 7. It is joined. The front surface electrode 30a is connected to the back surface electrode 3a through the through electrode 9a. The front surface electrodes 30b and 30d are connected to the back surface electrode 3b through the through electrodes 9b and 9d. A wire that connects the electronic component 4 and the surface electrode 30b and a sealing material that fills the recess 7 are omitted.

  As shown in FIG. 9B, the through electrode 9a is formed narrower than the electrode width of the front electrode 30a or the back electrode 3a. FIG. 9C shows a mode different from FIG. 9B, and the central portion of the through electrode 9a is penetrated. Therefore, also in this case, the effective electrode width of the through electrode 9a is narrower than the electrode width of the front electrode 30a or the back electrode 3a. In other words, in both cases of FIGS. 9B and 9C, the effective cross-sectional area of the through electrode 9a in the plane orthogonal to the direction in which the current flows is the back electrode 3a connected to the through electrode 9a or The cross-sectional area of the surface electrode 30a is smaller than the cross-sectional area in the plane orthogonal to the direction in which the current flows. Thereby, the lead frame LF can be bent easily.

  As described above, in the first to ninth embodiments, the example in which one LED is mounted as the electronic component 4 has been described. However, the present invention is not limited to this. A plurality of through electrodes 3a are formed by branching the back electrode 3a formed by the lead frame LF, and a plurality of through electrodes 3a are exposed on the surface 2a of the glass substrate 2 of each through electrode 3a, and an LED is mounted on each through electrode 9a. A plurality of LEDs can be formed on one electronic device 1. The light emission luminance can be increased by forming a plurality of LEDs.

(10th Embodiment)
FIG. 10 is a schematic longitudinal sectional view of an electronic device 10 according to the tenth embodiment of the present invention. The present embodiment is an electronic device 10 composed of a crystal resonator, and a crystal vibrating piece 12 is mounted as an electronic component 4. The same portions or portions having the same function are denoted by the same reference numerals.

  The glass substrate 2 is formed by bonding back electrodes 3a and 3b formed by bending a lead frame LF and through electrodes 9a and 9b. The front ends of the through electrodes 9a and 9b are exposed at the surface 2a of the glass substrate 2, and the first electrodes 13a and 13b are formed thereon so as to be electrically separated from each other. A crystal vibrating piece 12 is mounted on the first electrode 13 via a conductive material 15. The second electrode 14 and the first electrode 13a formed on the surface of the crystal vibrating piece 12 are electrically connected. Further, an electrode (not shown) is formed on the crystal vibrating piece 12 and is electrically connected to the first electrode 13b. Therefore, power can be supplied from the back electrodes 3 a and 3 b to the crystal vibrating piece 12. Further, on the glass substrate 2, a lid 11 for storing the crystal vibrating piece 12 is installed. For the lid 11, for example, a glass material is used and is bonded to the glass substrate 2. As a result, the space for accommodating the crystal vibrating piece 12 is sealed, and moisture or the like is not mixed from the outside.

  In each of the above-described embodiments, the case where the bent portion of the lead frame LF is a right angle has been described, but the present invention is not limited to this. The bending angle of the back electrode 3 and the through electrode 9 may be an obtuse angle or an acute angle. Alternatively, it may be bent in a curved shape. Moreover, although the example which mounts the electronic component 4 on the surface of the glass base material 2 and performs wire bonding was demonstrated, it is not limited to this. The electronic component 4 may be surface mounted on the surface of the glass substrate 2. Further, the back electrodes 3a and 3b can be formed so as to protrude from the side surface of the glass substrate 2 to the outside. If it does in this way, it will function as a radiating fin and can improve a cooling effect.

  Below, the method to manufacture the electronic device of this invention is demonstrated.

(First Reference Example)
11-17 is explanatory drawing showing the manufacturing method of an electronic device.

<Bending process>
FIG. 11 is a schematic top view of the lead frame LF showing the bending process of the lead frame LF. FIG. 11A is a top view of the frame tape 20 to which the lead frame LF joined to the glass substrate 2 is continuously connected. A NiFe alloy or the like is used as the lead frame LF, and the thickness is 0.1 mm to 0.5 mm. The thicker the sheet thickness, the more difficult it is to bend in the subsequent folding step, and the thinner the sheet thickness, the lower the conductivity and thermal conductivity.

  FIG. 11B is a top view of the lead frame LF with its tip end bent. The leading end of the lead frame LF was bent by pressing using a mold. The bent tip portions are portions that become through electrodes 29a and 29b shown in FIG. 13 described later, and other portions are portions that become the back electrodes 23a and 23b.

<Through hole formation process>
FIG. 12 is a schematic longitudinal sectional view for explaining a through hole forming step for forming the through hole 21 in the glass substrate 2. A plate-like glass material was placed in a mold, the mold and the glass material were heated to soften the glass material, and the through hole 21 and the depression 22 were formed by molding. Protrusions and projections are provided on the mold and pressed at a temperature at which the glass material softens. Thereby, the recess 22 and the through hole 21 were formed simultaneously. In addition, when the through-hole 21 does not penetrate only by pressing the mold against the glass material, the back surface of the glass material may be ground or polished after the forming process to penetrate the through-hole 21.

  In addition, it is possible to apply the photosensitive resin to the surface of the glass substrate, expose the glass surface only in the through hole portion, immerse the glass substrate in an etching solution, and form the through hole 21 by etching. Moreover, the through-hole 21 can be formed by the sandblast method. In addition, although the thickness of the glass base material 2 is 0.5 mm-1 mm here, this thickness changes with the uses of the electronic device 1. FIG.

<Installation process>
FIG. 13 is a schematic longitudinal sectional view for explaining an installation process for installing the bent lead frames LFa and LFb on the glass substrate 2. The lead frame LF with the distal end bent is inserted into the through hole 21 of the glass substrate 2 and the glass substrate 2 is placed on the lead frame LF. At this time, the leading end portions of the lead frame LF serving as the through electrodes 29 a and 29 b are set so as to be lower than the surface 2 a of the glass substrate 2. This is to prevent the tip portions of the through electrodes 29a and 29b from protruding beyond the surface 2a in the next molding process.

<Joint process>
FIG. 14 is a schematic longitudinal sectional view for explaining a joining step for joining the lead frame LF and the glass substrate 2. FIG. 14A shows a state in which the lead frame LF and the glass substrate 2 are installed on a surface plate (not shown) and the mold 24 is arranged on the upper part. For the lower surface plate and mold 24 (not shown), a material that is not fused or bonded to the glass substrate 2 is selected. On the lower surface of the mold 24, a convex portion 27 for forming the recess 7 is formed, and on the surface of the convex portion 27, concave portions 25a, 25b are formed at positions corresponding to the through electrodes 29a, 29b. Yes. The recesses 25a and 25b allow the tips of the through electrodes 29a and 29b to escape when the mold 24 is lowered to form the glass substrate 2, and pressurize the surrounding glass substrate 2 to promote flow. It is.

  FIG. 14B shows a state in which the mold 24 is lowered and the surface of the glass substrate 2 is pressed. At this time, the mold 24 and the glass substrate 2 are heated to a temperature at which the glass substrate 2 is softened. For example, when using soda glass as a glass substrate, the temperature is heated to 600 ° C to 900 ° C. As a result, the back electrodes 23 a and 23 b of the lead frame LF are joined to the back surface of the glass substrate 2. Furthermore, the side walls of the through holes around the through electrodes 29a and 29b flow and are joined to the surfaces of the through electrodes 29a and 29b.

<Mounting process>
FIGS. 15 and 16 are schematic cross-sectional views for explaining a mounting process for mounting the electronic component 4 on the bottom surface of the recess 7. FIG. 15 shows a step of forming the conductor 8 on the exposed portions of the through electrodes 29 a and 29 b, and FIG. 16 shows a step of mounting the electronic component 4 on the bottom surface of the recess 7.

  Fig.15 (a) is typical sectional drawing of the glass base material 2 which the joining process was complete | finished. The side surfaces of the through electrodes 29 a and 29 b are bonded to the glass substrate 2, and the back electrodes 23 a and 23 b are bonded to the back surface of the glass substrate 2. This joining is strong, and the sealing properties of the through electrodes 29a and 29b are also good. Concave portions 17a and 17b are formed at the exposed end portions of the through electrodes 29a and 29b. The front end portions of the through electrodes 29a and 29b exposed on the bottom surface 2d of the recess 7 of the glass base material 2 and the surface of the glass base material 2 in the vicinity of the front end portion have recesses 17a and 17b that are recessed from the surrounding surface. Form.

  FIG. 15B shows a state in which the recesses 17a and 17b are filled with the conductors 8a and 8b. The conductors 8a and 8b were formed by applying nano Ag particles by an ink jet printing method, and overheating and solidifying. Nano Ag particles are suitable because of their high conductivity and thermal conductivity. Further, the ink jet printing method has an advantage that it can be applied with high accuracy to the bottom surface 2d which is recessed from the surface 2a. Further, the nano Ag particles can be applied by a dispensing method instead of the ink jet method. In addition to nano Ag particles, nano Au particles or nano Cu particles can be used. Moreover, instead of the nano metal particles, a conductive paste may be used.

  FIG. 16 is a schematic cross-sectional view for explaining a mounting process of the electronic component 4. Electrodes (not shown) are formed on the front and back surfaces of the electronic component 4. The electronic component 4 is placed on the back surface of the formed lower electrode and the conductor 8a via a die bonding material (not shown). Next, the electronic component 4 is pressed while being heated and bonded to the bottom surface 2d and the conductor 8a. As the die bonding material, an alloy such as SnAgCu or AuSn can be used. Moreover, a conductive adhesive can be used as the die bonding material. Moreover, the electrode of the electronic component 4 and the conductor 8b were wire-bonded with a wire 5 made of Au. Further, a sealing material 6 made of a transparent resin was applied to the recess 7 to seal the electronic component 4 and the wire 5.

In addition, as the sealing material 6, the silicon oxide which hardened the polymetalloxane formed from the metal alkoxide or metal alkoxide can be used. Specifically, the metal alkoxide solution is filled using a dispenser or the like. For example, a mixed solution of nSi (OCH ₃ ) ₄ , 4nH ₂ O, catalyst NH ₄ OH, and crack preventing agent DMF (DMF: dimethylformamide) can be used. This is hydrolyzed and polymerized from room temperature to about 60 ° C. to form a polymetalloxane sol. Furthermore, it polymerizes at room temperature to 60 ° C. to form a wet gel of silicon oxide, and is dried and fired at a temperature of about 100 ° C. or 100 ° C. or more to form silicon oxide. Alternatively, a silicon oxide may be formed by filling polymetalloxane and polymerizing and baking in the same manner as described above.

<Modification of joining process>
FIG. 17 is a schematic diagram showing a joining process in which the glass substrate 2 is pressed by the mold 24 and is a modification. On the surface of the convex portion 27 of the mold 24, concave portions 25a and 25b for allowing the through electrodes 29a and 29b to escape are formed. A convex bank 26 is formed around the periphery. When the mold 24 is lowered and the glass substrate 2 is pressed, the bank 26 first comes into contact with the bottom surface 2d. Therefore, the glass substrate 2 around the through electrodes 29a and 29b can be more strongly pressurized. As a result, the side wall of the through hole 21 can be quickly moved and bonded to the surface of the through electrodes 29a and 29b.

  As described above, in the first reference example, the method of manufacturing the electronic device shown in the first to sixth embodiments of the present invention has been described. However, the back electrode branched into a plurality of parts shown in the seventh to ninth embodiments. In the case of the electronic device 1 having 3a, 3b and the through electrodes 9a, 9b, it can be manufactured similarly. In this case, the back electrodes 3a and 3b are bottom portions, the through electrodes 9a and 9b are bent portions, and the front electrodes 30a and 30b are tip portions. Further, a lead frame LF is formed by punching a metal sheet. In the case of the electronic devices of the seventh to ninth embodiments, the diameter of the through hole 21 formed in the glass substrate 2 is increased, and the glass substrate 2 may be flowed in a large amount from the periphery in the joining step. . Further, if a Ni film or an Au film is formed on the surfaces of the back electrodes 3a and 3b, solder connection is facilitated.

(Second reference example)
18 and 19 are schematic process diagrams illustrating a method for manufacturing an electronic device. Here, an oxide film is formed on the surface of the lead frame LF to enhance the bonding strength and adhesion to the glass substrate 2. Further, it is also possible to reinforce the bonding strength and adhesion to the glass substrate 2 by producing a minute uneven surface on the surface of the lead frame LF by etching. FIG. 18 shows a manufacturing method in which an oxide film is formed on the surface of the lead frame LF before the bonding step, and the oxide film exposed after the bonding step is removed. FIG. 19 shows a manufacturing method in which an oxide film is selectively formed on the surface of the lead frame FL. Since other processes are the same as those of the first reference example already described, description thereof is omitted.

  FIG. 18A shows a state where the lead frames LFa and LFb are separated. Next, as shown in FIG. 18B, the lead frame LF is heat-treated in an oxidizing atmosphere to form an oxide film 40 on the surface. For example, heat treatment is performed in an atmosphere containing moisture. For example, when a NiFe alloy such as Kovar is used as the lead frame LF, the oxidation treatment is performed at a temperature of about 800 ° C. or higher so that the surface becomes gray. Next, as shown in FIG. 18C, the tip portions of the lead frames LFa and LFb are bent and bent to form the back surface electrodes 23a and 23b and the through electrodes 29a and 29b.

  FIG. 18D is a schematic longitudinal sectional view of the glass substrate 2 after the joining step. Since the oxide film is formed on the bonding surface between the glass substrate 2 and the lead frame LF, the lead frame LF and the glass substrate 2 are firmly bonded. Moreover, it has sufficient airtightness between the glass base material 2 and the penetration electrodes 29a and 29b. Next, as shown in FIG. 18E, the oxide film 40 exposed to the outside is removed by reduction treatment. As a result, the front surfaces of the through electrodes 29a and 29b and the back electrodes 23a and 23b expose the metal surface 41. In the oxide film removal step, for example, high-temperature treatment is performed in an atmosphere of hydrogen gas or hydrogen gas mixed with nitrogen gas as a carrier gas. Alternatively, the surface oxide film is removed by hydrofluoric acid treatment. Thereby, electrical continuity with the electronic component 4 and other elements to be mounted can be easily obtained. The oxide film 40 may be formed before the bonding process.

  Next, another method for forming an oxide film on the lead frame LF will be described with reference to FIG. As shown in FIG. 19A, a resist film 42 is formed on the surface of the metal sheet 43 by patterning. Next, as shown in FIG. 19B, the oxide film 40 is selectively formed by exposing the metal sheet 43 to an oxidizing atmosphere. As the oxidizing atmosphere, for example, it is immersed in an oxidizing solution or exposed to oxygen plasma. Thereby, the oxide film 40 is formed on the surface of the metal sheet 43 on which the resist film 42 is not formed. Next, the resist film 42 is removed, and the metal sheet 43 is punched out by pressing as shown in FIG. As a result, the lead frame LFa and the lead frame LFb are separated. As a result, metal is exposed on the end surfaces of the leading ends of the lead frames LFa and LFb. Next, as shown in FIG. 19D, the leading ends of the lead frames LFa and LFb are bent by pressing. Thereby, an oxide film can be formed on both sides of the through electrodes 29a and 29b. Further, the oxide films 40a and 40b can be formed only on a part of the surfaces of the back electrodes 3a and 3b.

(Third reference example)
20, 21, and 22 are views for explaining a method of manufacturing the electronic device 1. A forming method in the case of forming a lead frame LF by punching and bending a metal sheet is shown. The other steps are the same as those in the first reference example or the second reference example, and thus description thereof is omitted. In each figure, the left side is a plan view (hereinafter referred to as the left view) showing the cutting and folding layout of the metal sheet, the center is a plan view when the metal sheet is punched (hereinafter referred to as the center view), and the right side is It is the figure (henceforth the right figure) seen from the side surface direction after bending. In each figure, a solid line is a cutting line of a metal sheet, and a broken line is a bending line.

  FIG. 20A shows a case where two lead frames LFa and LFb are separated and the tip is bent to form two through electrodes 9a and 9b. As shown in the left figure, before bending, the back electrode 3a, the through electrode 9a, the through electrode 9b, and the back electrode 3b are arranged in a line without a gap. As shown in the central and right views, after being separated and bent, the through electrode 9a is vertically erected at the end of the back electrode 3a, and similarly, the through electrode 9b is vertically at the end of the back electrode 3b. To stand. The distance between the through electrodes 9a and 9b is approximately the length of the through electrodes 9a and 9b.

  FIG. 20 (2) shows a case where two lead frames LFa and LFb are separated and the tip is bent to form two through electrodes 9a and 9b. The positions of the lead frames LFa and LFb are shifted in the y direction. ing. As shown in the left figure, the through electrode 9a and the through electrode 9b are arranged in the y direction with no gap before bending. As shown in the center diagram and the right diagram, after separation, the through electrode 9a stands vertically at the end of the back electrode 3a, and similarly, the through electrode 9b stands vertically at the end of the back electrode 3b. . Since the lead frames LFa and LFb are displaced in the y direction, the distance between the through electrodes 9a and 9b can be formed narrow, and the length of the through electrodes 9a and 9b can be adjusted relatively freely.

  FIG. 20 (3) shows a case where the three lead frames LFa, LFb, and LFc are separated and the tip is bent to form three through electrodes 9a, 9b, and 9c. As shown in the left figure, two lead frames LFb and LFc sandwich a wide lead frame LFa at the center, and the through electrodes 9b, 9a, 9c are aligned in the y direction with a space therebetween. As shown in the center view and the right view, after the separation, the through electrodes 9a, 9b, 9c stand vertically at the respective end portions of the back electrodes 3a, 3b, 3c. Since the lead frames LFa, LFb, and LFc are displaced in the y direction, the interval between the through electrodes 9a and 9b or 9c can be formed narrow. Furthermore, the length of the through electrodes 9a, 9b, 9c can be adjusted relatively freely.

  FIG. 20 (4) shows a case where the lead frame LFa is branched from the middle of the two lead frames LFa and LFb, and the tip is bent to form three through electrodes 9a1, 9a2 and 9b. The lead frames LFa and LFb are shifted in the y direction. As shown in the center view, in the lead frame LFa, the through electrode 9a1 is erected from the middle of the back surface electrode 3a, and the through electrode 9a2 is erected from the end of the lead frame LFa. The relationship between the through electrode 9a2 and the through electrode 9b is the same as that in FIG.

  FIG. 21 (5) shows a case where the lead frame LFa is bent stepwise in the x direction and the lead frame LFb is bent stepwise in the y direction. As shown in the left figure, the lead frames LFa and LFb are arranged in a row without any interval, and the back electrode 3a, the through electrode 9a and the surface electrode 30a, and the back electrode 3b, the through electrode 9b and the surface electrode 30b, respectively. It is composed of As shown in the center diagram and the right diagram, after being separated and bent, the lead frame LFa is bent stepwise in the x direction, and the lead frame LFb is bent stepwise in the y direction.

  FIG. 21 (6) shows a case where the lead frame LFa is separated into two lead frames LFa and LFb and the tip is bent to form two through electrodes 9a and 9b and two surface electrodes 30a and 30b. And LFb are shifted in the y direction. Each lead frame LFa, LFb has a stepped shape. As shown in the left figure, before the bending, the through electrode 9a and the surface electrode 30a, and the through electrode 9b and the surface electrode 30b are arranged in the y direction without gaps. As shown in the center and right figures, after being separated and bent, the through electrode 9a is erected vertically at the end of the back electrode 3a, and the surface electrode 30a is connected horizontally at the tip. It is formed in a staircase shape. Similarly, the through electrode 9b stands vertically at the end of the back electrode 3b, and the front electrode 30b is connected in the horizontal direction at the tip of the through electrode 9b so as to face the stepped shape of the lead frame LFa. Since the lead frames LFa and LFb are shifted in the y direction, the distance between the through electrodes 9a and 9b can be formed narrow, and the lengths of the through electrodes 9a and 9b and the lengths of the surface electrodes 30a and 30b are compared. Can be adjusted freely.

  FIG. 21 (7) shows a case where the three lead frames LFa, LFb, and LFC are separated and the tip is bent to form three through electrodes 9a, 9b, and 9c. Has a stepped shape. As shown in the left figure, two lead frames LFb and LFc sandwich a wide lead frame LFa at the center, and the through electrodes 9b, 9a, 9c are aligned in the y direction with a space therebetween. As shown in the center and right figures, after separating and bending, the through electrodes 9a, 9b, 9c are erected vertically at the respective ends of the back electrodes 3a, 3b, 3c, and further in the horizontal direction. The surface electrodes 30a, 30b, 30c extend. The direction of the step shape of the lead frame LFa and the direction of the step shape of the lead frames LFab and LFc are directions facing each other. Since the lead frames LFa, LFb, and LFc are displaced in the y direction, the interval between the through electrodes 9a and 9b or 9c can be formed narrow. Further, the lengths of the through electrodes 9a, 9b, 9c and the surface electrodes 30a, 30b, 30c can be adjusted relatively freely.

  FIG. 21 (8) shows a case where the lead frame LFa is bent in a step shape in the x direction and the lead frame LFb is bent in a U shape in the y direction. As shown in the left figure, the lead frames LFa and LFb are arranged in a row without any interval, and the back electrode 3a, the through electrode 9a and the surface electrode 30a, and the back electrode 3b, the through electrode 9b and the surface electrode 30b, respectively. It is composed of As shown in the center diagram and the right diagram, after being separated and bent, the lead frame LFa is bent in a step shape in the x direction, and the lead frame LFb is bent in a U shape in the y direction.

  In FIG. 22 (9), the tips of the two lead frames LFa and LFb are bent in a U-shape in opposite directions to form two through electrodes 9a and 9b and two surface electrodes 30a and 30b. This is the case. As shown in the left figure, before bending, the back electrode 3a, the through electrode 9a, and the front electrode 30a, and the back electrode 3b, the through electrode 9b, and the front electrode 30b are arranged apart from each other in the y direction. As shown in the center diagram and the right diagram, after being separated and bent, the through electrode 9a is erected vertically at the end of the back electrode 3a, and the U shape is formed horizontally from the end of the through electrode 9a. And the surface electrode 30a is formed. Similarly, the through electrode 9b stands vertically at the end of the back electrode 3b and is folded back in the horizontal direction from the end to form the surface electrode 30b. Since the lead frames LFa and LFb are arranged in parallel in the y direction, the interval between the through electrodes 9a and 9b in the x direction can be arranged narrowly. Furthermore, the lengths of the through electrodes 9a and 9b and the lengths of the surface electrodes 30a and 30b can be adjusted relatively freely.

  FIG. 22 (10) shows a case where the three lead frames LFa, LFb, and LFc are separated and the tip is bent to form three through electrodes 9a, 9b, and 9c. Has a U-shape. As shown in the left figure, the wide lead frame LFa at the center is arranged so that the two lead frames LFb and LFc are spaced apart from each other. As shown in the center and right figures, after separating and bending, the through electrodes 9a, 9b, 9c are erected vertically at the respective ends of the back electrodes 3a, 3b, 3c, and further in the horizontal direction. The folded surface electrodes 30a, 30b, and 30c are connected. The U-shaped direction of the lead frame LFa and the U-shaped directions of the lead frames LFa, LFb, and LFc are opposite to each other. Since the lead frames LFa, LFb, and LFc are displaced in the y direction, the interval between the through electrodes 9a and 9b or 9c can be formed narrow. Further, the lengths of the through electrodes 9a, 9b, 9c and the surface electrodes 30a, 30b, 30c can be adjusted relatively freely.

  FIG. 22 (11) is the same as the case shown in FIG. 22 (9). The difference is that narrow portions 18a and 18b are formed on the back electrode 3a of the lead frame LFa and the back electrode 3b of the lead frame LFb. By providing the constricted portions 18a and 18b, when the glass substrate 2 is heated and the back electrodes 3a and 3b are thermally expanded, stress applied to the glass substrate 2 from the back electrodes 3a and 3b is relieved. The material 2 is prevented from cracking or cracking.

DESCRIPTION OF SYMBOLS 1 Electronic device 2 Glass base material 3 Back surface electrode 4 Electronic component 5 Wire 6 Sealing material 7 Indentation 8 Conductor 9 Through-electrode 30 Surface electrode

Claims (19)

A glass substrate having a front surface and a back surface, an electronic component mounted on the surface of the glass substrate, and a lead frame penetrating from the back surface of the glass substrate to the surface of the glass substrate,
The lead frame is joined to the back surface of the glass base material to constitute a back electrode, and a bent portion penetrates from the back surface to the surface to constitute a through electrode that exposes the tip portion,
The electronic device is mounted such that the electronic component is electrically connected to the tip portion of the lead frame. 2. The electronic device according to claim 1, wherein a difference in thermal expansion coefficient between the glass substrate and the lead frame is 4 × 10 ⁻⁶ / K or less (K is Kelvin). The glass substrate has a thermal expansion coefficient of 8 × 10 ⁻⁶ / K to 11 × 10 ⁻⁶ / K, and the lead frame has a thermal expansion coefficient of 4 × 10 ⁻⁶ to 15 × 10 ⁻⁶ / K. The electronic device according to claim 1, wherein:   The electronic device according to claim 1, wherein the lead frame is made of an alloy containing Ni and Fe.   The electronic device according to any one of claims 1 to 4, wherein the lead frame is made of a clad material to which metals of different materials are bonded.   The electronic device according to claim 5, wherein a metal containing Cu is used for the clad material.   The electronic device according to claim 1, wherein a thin film made of Au is formed on the lead frame.   8. An oxide film made of an oxide of a metal material constituting the lead frame is formed on a joint surface between the lead frame and the glass substrate. The electronic device according to Item 1. The lead frame is formed in a plurality electrically separated from each other,
Of the plurality of lead frames, the electronic component is mounted on the leading end portion of one lead frame, and the electronic component is not mounted on the leading end portion of the other lead frame,
9. The cross-sectional area of the through electrode of the one lead frame in a plane orthogonal to the direction in which current flows is larger than the cross-sectional area of the through electrode of the other lead frame. The electronic device according to any one of the above.   10. The electronic device according to claim 9, wherein a line width of a back electrode constituted by the one lead frame is wider than a line width of a back electrode constituted by the other lead frame.   11. The electron according to claim 1, wherein the back surface electrode constituted by the lead frame occupies an area not exceeding 50% with respect to the total area of the back surface of the glass substrate. device.   The said front-end | tip part exposed to the surface of the said glass base material, and the surface of the said glass base material of the vicinity of the said front-end | tip part comprise the recessed part depressed rather than the surface of the circumference | surroundings. The electronic device according to any one of the above.   The electronic device according to claim 12, wherein the concave portion is filled with a conductor including metal particles.   The electronic device according to claim 13, wherein the conductor is a conductor formed of nano metal particles.   The back electrode comprised by the said lead frame has a recessed part dented with respect to the back surface side of the said glass base material, The said glass base material is filled in the said recessed part. The electronic device according to item.   The electronic device according to claim 1, wherein the back surface electrode configured by the lead frame has a constricted portion in which an electrode width is narrowed.   The electronic device according to claim 1, wherein the leading end portion of the lead frame constitutes a surface electrode that is bonded to a surface of the glass substrate.   The cross-sectional area of the through electrode in the plane perpendicular to the direction in which the current flows is smaller than the cross-sectional area in the plane orthogonal to the direction in which the current flows through the back electrode connected to the through electrode. The electronic device according to claim 1, wherein: A depression is formed on the surface of the glass substrate, and the tip is exposed at the bottom of the depression,
The electronic device according to claim 1, wherein the electronic component includes a light emitting diode, and the light emitting diode is mounted on the bottom surface of the recess.

Images