JP6419015B2 - Discharger package and discharger - Google Patents

Description

  The present invention relates to a package for a discharger and a discharger including the same.

  In recent years, a camera function is provided in a mobile device such as a mobile phone, and it is required to capture a bright image at night and indoors. A lighting device provided in a portable device needs to be downsized, and conventionally, a lighting device using an LED (Light Emitting Diode) is provided. However, the amount of light in the LED is low, and the required amount of illumination light cannot be emitted. Therefore, it has been proposed to reduce the size of a discharger having a structure in which an inert gas such as xenon is filled in a glass tube that can instantaneously emit a large amount of light.

  However, if the glass tube constituting the discharger is simply reduced in size, the durability of the glass tube filled with an inert gas, particularly the durability against thermal stress, may be reduced. Therefore, considering the durability, there is a limit to miniaturization of the glass tube, and as a result, there is a limit to miniaturization of the discharger.

  Therefore, a light emitting device having a structure in which an inert gas such as xenon is filled in a discharge space of a container member made of ceramics and a plate-like discharge electrode is provided in the discharge space has been proposed (see Patent Document 1). ).

JP 2011-96562 A

  However, in the technique described in Patent Document 1, it cannot be said that the discharge efficiency between the plate-like discharge electrodes is sufficient, and there is a problem that the amount of light is insufficient.

  An object of the present invention is to provide a discharger package having a high discharge efficiency between discharge electrodes and ensuring a sufficient amount of light, and a discharger including the discharger package.

  A package for a discharger according to an aspect of the present invention is a housing made of ceramics, and is provided on a plate-like bottom portion and a main surface of the bottom portion, and has a frame shape along an outer peripheral edge of the bottom portion. A side wall portion having an inner peripheral surface perpendicular to the main surface of the bottom portion, and a region protruding from the region surrounded by the side wall portion of the main surface of the bottom portion, or a portion protruding from the inner peripheral surface of the side wall portion, A pair of plate-like protrusions having an upper surface parallel to the main surface of the bottom, and a pair of metal layers made of a first metal and provided on each upper surface of the pair of protrusions, A pair of rod-shaped discharge electrodes made of a second metal, wherein a pair of discharge electrodes are joined to the pair of metal layers by a conductive bonding material so that the tips of the discharge electrodes face each other. It is characterized by including these.

  A discharger according to one aspect of the present invention includes the above-described discharger package, a lid that closes an upper end opening of the side wall of the casing, the bottom and the side wall of the casing, and the lid And an inert gas filled in a space surrounded by the body.

  ADVANTAGE OF THE INVENTION According to this invention, the discharge efficiency between a pair of discharge electrode is high, and the discharger provided with this discharger package which can ensure sufficient light quantity and this discharger package can be provided.

It is an external view of the imaging device 1 which has the discharger 10 which concerns on one Embodiment of this invention. It is a perspective view of the discharger 10 of FIG. FIG. 3 is an exploded perspective view of the discharger 10 of FIG. 2. It is sectional drawing of the discharger 10 when it cut | disconnects by the cut surface line AA of FIG. 2 is a plan view of a discharger package 11 constituting the discharger 10. FIG. It is the bottom view which looked at the package 11 for electric dischargers from the downward direction. It is a disassembled perspective view which shows the laminated body for manufacturing the package 11 for electric dischargers.

  Hereinafter, a package for a discharger and a discharger according to the present invention will be described with reference to the drawings.

  FIG. 1 is an external view of an imaging apparatus 1 having a discharger 10 according to an embodiment of the present invention. The discharger 10 is built in the imaging device 1 such as a portable terminal such as a smartphone or a digital camera. The discharger 10 can emit a flash of a large amount of light instantaneously as compared with an LED, for example, by using a discharge action of an inert gas such as a rare gas. The circuit configuration for causing the discharger 10 to emit light is the same as a conventionally known flash light emitter using a xenon discharge tube having a structure in which an inert gas such as xenon is filled in a glass tube. An imaging apparatus 1 shown in FIG. 1 is a smartphone, and is provided with an optical device 2 having a lens capable of imaging on the back side of a display surface and a light emitting device 3 incorporating a discharger 10.

  2 is a perspective view of the discharger 10 of FIG. 1, FIG. 3 is an exploded perspective view of the discharger 10 of FIG. 2, and FIG. 4 is a discharger taken along the cutting plane line AA of FIG. 10 is a cross-sectional view of FIG. 5 is a plan view of the discharger package 11 constituting the discharger 10, and FIG. 6 is a bottom view of the discharger package 11 as viewed from below.

  The discharger 10 is bonded to the discharger package 11 according to the present embodiment and the side wall 111B of the casing 111 in the discharger package 11 so as to close the upper end opening 111Bb of the side wall 111B, and is discharged by the side wall 111B. It is configured to include a lid 12 that closes the space P, and an inert gas filled in the discharge space P. The inert gas is, for example, a gas whose main component is xenon (Xe), which is a rare gas.

  The lid 12 is a light-transmitting flat plate-like member, joined to the upper surface of the side wall 111B of the casing 111 in the discharger package 11, and closes the upper end opening 111Bb of the side wall 111B. Here, the “translucency” of the lid 12 means that light having a wavelength of at least a part of light emitted by light emission in the discharge space P can be transmitted. The lid 12 is made of an insulating material such as glass, sapphire, or translucent ceramic.

When the lid 12 is made of glass, the lid 12 is fixed to the upper surface of the side wall 111B of the housing 111 in the discharger package 11 by glass bonding. When the lid 12 is made of sapphire or translucent ceramics, the lid 12 is fixed to the upper surface of the side wall 111B of the casing 111 in the discharger package 11 by glass bonding or sintering bonding. “Sintered bonding” means that the side wall portion 111B of the casing 111 and the lid body 12 are subjected to high-temperature treatment in a state where the surfaces to be bonded are brought into contact with each other using a bonding jig. Side wall 111
It means that the glassy substance contained in B is made to function as a bonding material and bonded.

  The discharger package 11 includes a casing 111, a pair of metal layers 112 and 113, a pair of discharge electrodes 114 and 115, and a trigger electrode 116.

  The casing 111 is made of ceramics such as alumina, titania-based oxide, and zirconate-based oxide. The casing 111 includes a rectangular plate-shaped bottom portion 111A, a rectangular frame-shaped side wall portion 111B, and a pair of rectangular plate-shaped protruding portions 111Ba. In the housing 111, the bottom 111A, the side wall 111B, and the pair of protrusions 111Ba are integrally formed.

  In the casing 111, the side wall portion 111B is provided on the main surface of the bottom portion 111A, forms a frame shape along the outer peripheral edge of the bottom portion 111A, and has an inner peripheral surface perpendicular to the main surface of the bottom portion 111A. In other words, the side wall 111B has an upper end opening 111Bb whose lower surface is connected to the outer peripheral edge of the main surface of the bottom 111A and opened upward, and the discharge space P is defined by the inner peripheral surface perpendicular to the main surface of the bottom 111A. The

  Each of the pair of protrusions 111Ba protrudes from a region surrounded by the side wall 111B of the main surface of the bottom 111A, or protrudes from the inner peripheral surface of the side wall 111B and is parallel to the bottom 111A. In the present embodiment, each of the pair of protruding portions 111Ba protrudes into the discharge space P from a portion corresponding to two mutually opposing short sides of the rectangular frame shape on the inner peripheral surface of the side wall portion 111B. The pair of protrusions 111Ba has a lower surface continuous to the main surface of the bottom portion 111A and an upper surface parallel to the main surface of the bottom portion 111A.

  In the casing 111, the bottom 111A has a long side length of 5 mm to 20 mm, a short side length of 2 mm to 5 mm, and a thickness of 0.2 mm to 0.5 mm. Further, the side wall portion 111B has a thickness (height from the main surface of the bottom portion 111A) of 0.2 mm to 1 mm, and has a long side length of 5 mm to 20 mm and a short side length of the outer peripheral edge. The length of the long side is 3 mm to 18 mm and the length of the short side is 1 mm to 4 mm. Furthermore, each of the pair of protruding portions 111Ba has a thickness (height from the main surface of the bottom portion 111A) of 0.2 mm to 1 mm, and a short side length (a protruding length into the discharge space P). It is 0.5 mm-3 mm, and the length of a long side is 1 mm-3 mm.

  The casing 111 has a castellation 111C that is recessed in a curved shape inwardly at the center of the side surface corresponding to the two short sides of the bottom 111A and the center of the side surface corresponding to one long side of the bottom 111A. Is provided. Each castellation 111C is formed with a conduction path corresponding to each of external terminals 117, 118, and 119 described later.

  The pair of metal layers 112 and 113 are made of the first metal, and are provided on the upper surfaces of the pair of protrusions 111Ba in the casing 111 in a state of being electrically insulated from each other. As a 1st metal which comprises a pair of metal layers 112 and 113, refractory metals, such as tungsten (W) and molybdenum (Mo), can be mentioned.

  The pair of discharge electrodes 114 and 115 is made of a second metal, and is an electrode used to cause a dielectric breakdown in the inert gas due to a potential difference and to pass a current through the inert gas, one being an anode and the other being Is the cathode. The pair of discharge electrodes 114 and 115 are each formed in a rod shape having a length of 1 mm to 5 mm and an outer diameter of 0.3 mm to 0.8 mm.

  The pair of discharge electrodes 114 and 115 are made of conductive bonding materials 114b and 115b on the pair of metal layers 112 and 113, respectively, so that the tips 114a and 115a of the discharge electrodes 114 and 115 face each other. It is joined.

  The pair of discharge electrodes 114 and 115 have their axes coincident with each other, each axis is parallel to an imaginary straight line passing through the centers of the two short sides of the rectangular frame-shaped side wall portion 111B, and the tips 114a and 115a are each protruding portion. It is joined on a pair of metal layers 112 and 113 provided on the upper surface of each protrusion 111Ba so as to extend inward from the upper surface of 111Ba. Preferably, the pair of discharge electrodes 114 and 115 have their axes coincident with each other, and each axis coincides with an imaginary straight line passing through the centers of the two short sides of the rectangular frame-shaped side wall portion 111B.

  Examples of the second metal constituting the pair of discharge electrodes 114 and 115 include refractory metals such as tungsten (W) and molybdenum (Mo). Further, the second metal constituting the pair of discharge electrodes 114 and 115 may be the same as or different from the first metal constituting the pair of metal layers 112 and 113.

  Among the pair of discharge electrodes 114 and 115, the discharge electrode serving as the cathode is a lanthanum oxide having excellent electron emission characteristics, oxidation, in addition to the second metal which is a refractory metal such as tungsten (W) and molybdenum (Mo). It may contain yttrium or cerium oxide.

  The shapes of the tips 114a and 115a of the pair of discharge electrodes 114 and 115 are not particularly limited, but are preferably tapered such as a hemispherical shape, a truncated cone shape, and a truncated pyramid shape. The tips 114a and 115a of the pair of discharge electrodes 114 and 115 are tapered, in particular, the tip of the discharge electrode serving as the cathode is tapered, so that the electron emission characteristics can be improved, and the pair of discharge electrodes 114. , 115 can be made higher, so that a sufficient amount of light can be secured in the discharger 10.

  The joining materials 114b and 115b for joining the pair of discharge electrodes 114 and 115 to the pair of metal layers 112 and 113 are metal brazing materials mainly composed of tungsten, and the first material constituting the pair of metal layers 112 and 113 is used. 1 metal and the 2nd metal which comprises a pair of discharge electrodes 114 and 115, and the metal which can form an alloy are contained 1% or more and 50% or less.

  The metal contained in the bonding materials 114b and 115b includes tungsten (W) or molybdenum (the first metal constituting the pair of metal layers 112 and 113 and the second metal constituting the pair of discharge electrodes 114 and 115). Corresponding to being Mo), it is nickel (Ni) or titanium (Ti) or cobalt (Co). By using the bonding materials 114b and 115b containing a metal capable of forming an alloy with the first metal and the second metal, the bonding strength between the pair of discharge electrodes 114 and 115 and the pair of metal layers 112 and 113 is improved. Can be made.

  The trigger electrode 116 is formed in a rectangular plate shape, and is embedded in the bottom 111A so as to be electrically insulated from the pair of metal layers 112 and 113 and the pair of discharge electrodes 114 and 115. The trigger electrode 116 preliminarily discharges with the discharge electrode serving as the cathode of the pair of discharge electrodes 114 and 115 in accordance with a signal from an external trigger circuit, and stabilizes between the pair of discharge electrodes 114 and 115. The main discharge is started.

  The trigger electrode 116 is made of a refractory metal such as tungsten (W) and molybdenum (Mo). The trigger electrode 116 has a long side length of 3 mm to 18 mm, a short side length of 1 mm to 4 mm, and a thickness of 1 μm to 10 μm.

  Furthermore, the discharger package 11 of the present embodiment is provided with external terminals 117 and 118 corresponding to the pair of metal layers 112 and 113 and external terminals 119 corresponding to the trigger electrode 116 on the outer surface of the casing 111. It has been.

  The metal layer 112 and the external terminal 117 are electrically connected through a conduction path 117a formed in the castellation 111C, and the metal layer 113 and the external terminal 118 are connected through a conduction path 118a formed in the castellation 111C. The trigger electrode 116 and the external terminal 119 are electrically connected via a conduction path (not shown) formed in the castellation 111C. External terminals 117, 118, 119 and conduction paths 117a, 118a are each made of a refractory metal such as tungsten (W) and molybdenum (Mo).

  Next, a method for manufacturing the discharger 10 according to the present embodiment will be described with reference to FIG. FIG. 7 is an exploded perspective view showing a laminate for manufacturing the discharger package 11. The manufacturing method of the discharger 10 includes a forming process, a printing process, a firing process, and an enclosing process. As shown in FIG. 7, the discharger package 11 constituting the discharger 10 includes a rectangular plate-shaped first ceramic green sheet 21, a rectangular plate-shaped second ceramic green sheet 22, and a rectangular plate-shaped first ceramic green sheet 22. 3 and the fourth ceramic green sheet 24 having a rectangular plate shape.

  In the forming step, the first ceramic green sheet 21, the second ceramic green sheet 22, the third ceramic green sheet 23, and the fourth ceramic green sheet 24 before processing are formed into a predetermined shape. For example, the first ceramic green sheet 21 is formed such that a first sheet hole 211 that penetrates in the thickness direction corresponding to the upper end opening 111Bb of the side wall 111B of the housing 111 is formed. The second ceramic green sheet 22 is formed with a second sheet hole portion 221 penetrating in the thickness direction corresponding to the upper end opening 111Bb and the pair of projecting portions 111Ba of the side wall portion 111B of the casing 111, and has a rectangular plate shape. The second sheet notch 222 that is recessed inwardly in a curved shape corresponding to the castellation 111C is formed at the center of the edge of the two short sides facing each other in the sheet. The third ceramic green sheet 23 is a third sheet cutout 231 that is recessed inwardly in a curved shape inwardly corresponding to the castellation 111C at the center of the edge of the two short sides facing each other in the rectangular plate-like sheet. Is formed so that a third sheet cutout 231 that is recessed inwardly in a curved shape corresponding to the castellation 111C is formed at the center of the edge of one long side. The fourth ceramic green sheet 24 is a fourth sheet cutout 241 that is recessed in a curved shape inwardly corresponding to the castellation 111C at the center of the edge of the two short sides facing each other in the rectangular plate-like sheet. And a fourth sheet cutout 241 that is recessed inwardly in a curved shape corresponding to the castellation 111C is formed at the center of the edge of one long side.

  Here, the ceramic green sheet before processing is formed by a conventionally known method. For example, alumina, titania-based oxide, zirconate-based oxide, or the like is used as the main component of the raw material of the ceramic green sheet before processing. When using a sintered body mainly composed of barium titanate, for example, a predetermined amount of magnesium oxide powder, rare earth oxide powder and manganese oxide powder are blended with barium titanate powder, If necessary, glass powder is added as a sintering aid to obtain raw powder. Next, an organic vehicle is added to the raw material powder to prepare a ceramic slurry, and then a ceramic green sheet before processing is formed using a conventionally known sheet forming method such as a doctor blade method or a die coder method.

In the printing process, which is a subsequent process of the forming process, the pair of metal layers 112 and 113 are printed on one main surface of the second ceramic green sheet 22. Further, the trigger electrode 116 is printed on one main surface of the fourth ceramic green sheet 24. In FIG. 7, the trigger electrode 116 is printed on one main surface of the fourth ceramic green sheet 24, but on the surface of the third ceramic green sheet 23 facing the fourth ceramic green sheet 24. The trigger electrode 116 may be printed.

  In addition, external terminals 117, 118, and 119 are printed on the surface of the fourth ceramic green sheet 24 opposite to the surface facing the third ceramic green sheet 23. The second ceramic green sheet 22 is led to the second sheet notch 222, the third ceramic notch 231 of the third ceramic green sheet 23, and the fourth notch 241 of the fourth ceramic green sheet 24. The passages 117a and 118a are printed.

  In the printing process, the pair of metal layers 112 and 113, the trigger electrode 116, the external terminals 117, 118, and 119, and the conduction paths 117a and 118a are made of metal particles such as tungsten (W) or molybdenum (Mo), which is a refractory metal. In addition, a metal paste obtained by adding and mixing a predetermined organic binder and a solvent is printed using a conventionally known screen printing method.

  In the firing process, which is a subsequent process of the printing process, the first ceramic green sheet 21, the second ceramic green sheet 22, the third ceramic green sheet 23, and the fourth ceramic green sheet 24 are combined into a pair of metal layers 112. , 113 are included in the hole 211 of the first ceramic green sheet 21 and the trigger electrode 116 is sandwiched between the third ceramic green sheet 23 and the fourth ceramic green sheet 24. Form. Next, the laminated body is fired.

  As the firing conditions of the laminate in the firing step, the heating rate is 5 ° C./h to 300 ° C./h, degreasing is performed in a temperature range up to 500 ° C., and then the heating rate is 25 ° C./h to 1000 ° C. / H is calcined in a reducing atmosphere of a mixed gas of hydrogen and nitrogen at a temperature range of 1400 ° C. to 1600 ° C. for 0.5 to 4 hours.

  Next, the pair of discharge electrodes 114 and 115 are bonded to the pair of metal layers 112 and 113 using the bonding materials 114b and 115b, and the discharger package 11 is manufactured.

  Next, in the sealing step, for example, in an inert gas atmosphere containing xenon (Xe) as a main component, the upper surface of the side wall portion 111B of the casing 111 of the discharger package 11 is brought into close contact with the lid 12 so that the casing 111 An inert gas is sealed in a sealed space (discharge space P) surrounded by the bottom portion 111 </ b> A and the side wall portion 111 </ b> B and the lid body 12. For the close contact between the upper surface of the side wall portion 111 </ b> B and the lid body 12, glass having a lower melting point than the glass used for the lid body 12 is used.

  The discharger 10 according to the present embodiment can be manufactured through the molding step, the printing step, the firing step, and the sealing step.

  According to the discharger 10 of the present embodiment configured as described above, a pair of rod-shaped discharge electrodes is formed on the pair of metal layers 112 and 113 provided on the upper surfaces of the pair of protrusions 111Ba in the casing 111 made of ceramics. 114 and 115 are joined by joining materials 114b and 115b so that the tips 114a and 115a of the discharge electrodes 114 and 115 face each other. By using such a pair of rod-shaped discharge electrodes 114, 115, for example, a pair of discharge electrodes 114 compared to a configuration using plate-shaped discharge electrodes as in the light emitting device described in Patent Document 1, for example. , 115 can be increased, so that a large amount of light can be emitted instantaneously, and a sufficient amount of light can be secured in the discharger 10.

  Further, the tip end 114a, 115a of the pair of discharge electrodes 114, 115 is tapered, in particular, the tip of the discharge electrode serving as the cathode is tapered, so that the electron emission characteristics can be improved, and the pair of discharge electrodes The discharge efficiency between the electrodes 114 and 115 can be further increased.

  Further, the bonding materials 114b and 115b for bonding the pair of discharge electrodes 114 and 115 to the pair of metal layers 112 and 113 include the first metal constituting the pair of metal layers 112 and 113, and the pair of discharge electrodes 114 and 113, respectively. The second metal constituting 115 and a metal capable of forming an alloy are contained. By using the bonding materials 114b and 115b containing such a metal, the bonding strength between the pair of discharge electrodes 114 and 115 and the pair of metal layers 112 and 113 can be improved.

  Further, in the discharger 10, since the casing 111 made of ceramics is used as a structure in which the discharge space P is filled with the inert gas, a conventional structure in which the glass tube is filled with an inert gas such as xenon is used. As compared with the xenon discharge tube, a decrease in durability due to heat generated by the discharge between the pair of discharge electrodes 114 and 115 is suppressed.

  The above effect can be explained using the thermal conductivity of each material constituting the discharger 10 as an index. That is, the thermal conductivity of tungsten (W), which is a material constituting the pair of discharge electrodes 114 and 115, is 173 [W / mK], whereas the thermal conductivity of the ceramic constituting the casing 111, for example, alumina. Is 32 [W / mK], and the thermal conductivity of quartz glass is 1.4 [W / mK]. In the discharger 10, the heat generated by the discharge between the pair of discharge electrodes 114 and 115 is more thermally conductive than the quartz glass constituting the glass tube via the bonding materials 114 b and 115 b and the pair of metal layers 112 and 113. The heat is dissipated by the casing 111 made of high ceramics. As a result, heat can be prevented from being accumulated in the pair of discharge electrodes 114 and 115, so that the durability of the pair of discharge electrodes 114 and 115 is improved, and consequently the durability of the discharger 10 is improved.

  The present invention is not limited to the above-described embodiment, and various modifications and changes can be made without departing from the scope of the present invention. Further, all modifications and changes belonging to the scope of the claims are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Optical apparatus 3 Light-emitting device 10 Discharger 11 Package for dischargers 12 Cover body 21 1st ceramic green sheet 22 2nd ceramic green sheet 23 3rd ceramic green sheet 24 4th ceramic green sheet 111 Case 111A Bottom portion 111B Side wall portion 111Ba Projection portion 111C Castellation 112, 113 Metal layer 114, 115 Discharge electrode 114a, 115a Tip 114b, 115b Joining material 116 Trigger electrode 117, 118, 119 External terminal 117a, 118a Conducting path 211 First sheet hole Part 221 Second sheet hole 222 Second sheet notch 231 Third sheet notch 241 Fourth sheet notch P Discharge space

Claims (5)

A housing made of ceramics,
A plate-like bottom;
A side wall portion provided on a main surface of the bottom portion, forming a frame shape along an outer peripheral edge of the bottom portion, and having an inner peripheral surface perpendicular to the main surface of the bottom portion;
A pair of plate-like protrusions protruding from a region surrounded by the side wall portion of the main surface of the bottom portion or protruding from the inner peripheral surface of the side wall portion and having an upper surface parallel to the main surface of the bottom portion A housing comprising:
A pair of metal layers made of a first metal and provided on the upper surface of each of the pair of protrusions;
A pair of rod-shaped discharge electrodes made of a second metal, wherein a pair of discharge electrodes are joined to the pair of metal layers by a conductive bonding material so that the tips of the discharge electrodes face each other. And a package for a discharger.   The discharger package according to claim 1, wherein the bonding material contains a metal capable of forming an alloy with the first metal and the second metal. The first metal and the second metal are tungsten or molybdenum;
The discharge metal package according to claim 2, wherein the metal is nickel or titanium.   The package for a discharger according to any one of claims 1 to 3, wherein the tip of each discharge electrode is tapered. A package for a discharger according to any one of claims 1 to 4,
A lid for closing the upper end opening of the side wall of the housing;
A discharger comprising: an inert gas filled in a space surrounded by the bottom and side walls of the casing and the lid.

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