JP2009188217A - Lid with lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid with a lens having improved strength against external force, and prevent damage particularly on a glass lens. <P>SOLUTION: One end of a cylindrical member 2 is bent outward to form a first outward brim part 3 that extends outward in the radial direction. The outer end of the first brim part 3 is shaped as an edge having substantially no curvature, and as a result, on the boundary face between the cylindrical member 2 and a glass lens 6, no step or no tip exists that would otherwise become a starting point on which stress concentrates. Thus, even if stress is applied, the stress does not concentrate on the glass lens 6, and this helps prevent damage on the glass lens 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lid with a lens used for a package for an optical semiconductor device.

  In general, an optical semiconductor device provided with a light emitting / receiving element such as a photodiode or a phototransistor is fixed to the base, covers the light receiving / emitting element with an airtight lid with a lens, and the base with the lens is a base. It is formed by mounting by electro welding or the like.

  FIG. 5 is a cross-sectional view showing the above-mentioned lid body with a lens, 101 is a lid body with a lens, 102 is a cylindrical member, 103 is an inward flange, 104 is a lens mounting hole, 105 is a glass lens, and 106 is an outward collar. Each part is shown.

  In FIG. 5, the lens-equipped lid body 101 has a cylindrical member 102 made of metal, and the cylindrical member 102 is folded inward at one end to form an inward flange 103, and the other end is folded outward to outward. Part 106 is used.

A hole formed inside the inward flange 103 becomes a lens mounting hole 104, and the glass lens 105 is fused to the lens mounting hole 104.
The glass lens 105 has a shape including the inward flange portion 103, and extends from the opening edge of the lens mounting hole 104 toward the outer edge of the inward flange portion 103 on the upper side of the inward flange portion 103. On the lower side, it reaches the inner wall of the cylindrical member 102 from the opening edge of the lens mounting hole 104, and extends on a part of the wall surface of the cylindrical member 102.

  Such a lens-equipped lid body 101 is disposed so as to cover a light emitting / receiving element (not shown) fixed to the main surface of a base (not shown), and the outward flange 106 that contacts the main surface of the base is electrically connected. Fix it to the base by welding or other methods.

The glass lens 105 is fused to the cylindrical member 102 by adhering molten glass to the inward flange portion 103 of the cylindrical member 102.
At this time, there is an inevitable curvature portion between the inward flange portion 103 formed by bending the end of the cylindrical member 102 inward and the straight body portion of the cylindrical member 102. The upper surface of the flange 103 may reach a part of the outer wall surface of the cylindrical member 102 along the curvature portion. Alternatively, the shape of the molten glass itself may increase beyond the outer edge of the inward flange 103 due to the swelling of the molten glass itself.

  In order to prevent this, there is a conventional lid with a lens that forms a shape that prevents the molten glass from flowing on the main surface of the inward flange 103. For example, the configuration described in Patent Document 1 is provided. is there.

  FIG. 6 is a cross-sectional view of a main part of a conventional lid body with a lens described in Patent Document 1, and relates to a portion corresponding to the portion A shown in FIG. 5, which is different from the lid body with a lens 101 shown in FIG. The part which the cylindrical member 102 and the glass lens 105 fuse | melt is shown.

  In FIG. 6, the inward flange 103 formed at one end of the cylindrical member 102 has a flow stop of molten glass formed on its main surface, and FIG. 6 (a) shows the projection 107 as a flow stop. FIG. 6 (b) shows a configuration surrounding the glass lens (molten glass) 105 by forming a groove portion 108 as a flow stopper, and FIG. 6 (b) shows a configuration surrounding the glass lens (molten glass) 105. (C) has shown the structure which forms the level | step-difference part 109 as a flow stop and surrounds the glass lens (molten glass) 105. FIG.

According to this, when the molten glass is adhered to the inward flange 103 and fused to the cylindrical member 102, the projection 107, the groove 108, and the step 109 act as a glass flow stopper, so that the glass lens 105 It is possible to prevent the size from exceeding the outer edge of the inward flange portion 103.
JP-A-5-55396

  In the conventional configuration described above, the glass lens 105 has a shape including the inward flange portion 103, and a portion corresponding to the lens mounting hole 104 in FIG. 5 has an outer periphery facing the tip of the opening edge of the inward flange portion 103. Yes. However, for example, when stress is generated during the above-described electric welding, or when other external force is applied and stress is generated, the stress concentrates on the glass lens 105 at the tip of the inward flange portion 103. For this reason, there is a possibility that the glass lens 105 cracks from the pointed end of the inward flange portion 103 to impair the translucency of the glass lens 105, or the glass lens 105 falls off the cylindrical member 102.

  The present invention solves the above-described conventional problems, and does not cause stress concentration in the glass lens even when electric welding or other external force acts, and can prevent damage to the glass lens. An object is to provide a lid.

  In order to solve the above-described problems, a lid with a lens according to the present invention includes a cylindrical member in which one opening forms a lens mounting hole, and a glass lens fused to the lens mounting hole, and the cylindrical member includes The outward flange has an outward flange extending radially outward around the one opening, and has a curved portion that forms a curved surface from an inner wall surface of the cylindrical member to a main surface of the outward flange. The outer edge of the portion has a terminal end having substantially no curvature, the glass lens closes the lens mounting hole, and the curved surface of the curvature portion and the main surface of the outward flange portion from the inner wall surface of the cylindrical member And extending to the outer edge of the outward flange.

  In addition, the cylindrical member is made of metal, the cylindrical member has the outward flange as a first outward flange that extends radially outward around the one opening, and the other opening A second outward flange extending radially outward in the periphery, wherein the first outward flange and the second outward flange are on both ends of the cylindrical member; It is characterized by being bent outward substantially perpendicular to the heart.

  According to the present invention, the outward flange that receives the glass lens that closes the lens mounting hole in the axial direction of the cylindrical member extends radially outward from the opening of the cylindrical member, and the cylindrical member and the glass lens At the interface, that is, the interface extending from the inner wall surface of the cylindrical member through the curved surface of the curved portion and the main surface of the outward flange to the outer edge of the outward flange, there is a step or point that becomes a starting point for stress concentration. Instead, the glass lens and the cylindrical member abut on a curved surface and a flat surface.

  For this reason, even when an impact or stress is applied to the cylindrical member, stress concentration on the glass lens can be prevented. Therefore, mechanical strength against external force is superior to conventional ones, and damage to the lens in particular is prevented. Can do. Therefore, it becomes a structure which can prevent that a glass lens cracks and impairs the translucency and airtightness of a glass lens, or a glass lens falls off from a cylindrical member.

  In addition, the outer edge of the outward flange has substantially no curvature and is terminated, so that when a glass lens is formed by adhering a molten glass to a cylindrical member, it is not necessary to provide a flow stop for the molten glass. The glass can be surely stopped without protruding from the outer edge of the outward flange.

  Further, since the outward flange extends radially outward from the cylindrical member, the outward flange does not block the light from the light emitting element, and the light emitted from the light emitting element can be extracted more efficiently than the conventional one. Is possible.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a lid with a lens according to an embodiment of the present invention, FIG. 1 (a) is a cross-sectional view showing the whole, and FIG. 1 (b) is a cross-sectional view of an essential part showing part A of FIG. 1 (a). 1 is a lid with a lens, 2 is a cylindrical member, 3 is a first outward flange, 3a is a terminal portion, 4 is a lens mounting hole, 5 is a second outward flange, and 6 is a glass lens. Each is shown.

  In FIG. 1, a lid body 1 with a lens has a cylindrical member 2 made of metal. The cylindrical member 2 has one end bent outward to form a first outward flange 3, and the other end bent outward to form a second outward flange 5. The first outward flange 3 and second The outward flange 5 is bent in a direction substantially perpendicular to the axis of the cylindrical member 2 and has a shape extending radially outward around the openings on both sides of the cylindrical member 2.

  A glass lens 6 is mounted on the cylindrical member 2 with one opening corresponding to the first outward flange 3 serving as a lens mounting hole 4. The glass lens 6 closes the lens mounting hole 4 and is fused to the cylindrical member 2 to form a vertically convex lens shape. From the opening edge of the lens mounting hole 4 on the upper side of the first outward flange 3. It extends to the outer edge of the first outward flange 3 and extends from the opening edge of the lens mounting hole 4 to a predetermined length along the inner wall surface of the cylindrical member 2.

  The cylindrical member 2 has a curved portion that forms a curved surface from the inner wall surface to the main surface of the first outward flange 3, and the outer edge of the first outward flange 3 has a terminal end that has substantially no curvature. Thus, the main surface of the first outward flange 3 and the outer peripheral surface 3a do not continue in a curved manner, but form a discontinuous surface with the corner of the outer edge as a boundary.

  In the present embodiment, the metal forming the cylindrical member 2 is iron-nickel-cobalt alloy or 42 alloy, and the glass forming the glass lens 6 is borosilicate glass excellent in heat resistance and chemical resistance. is there.

  According to such a configuration, the first outward flange 3 extending radially outward does not enter the glass lens 6, and the cylindrical member 2 has no portion that enters the glass lens 6. The interface between the lens 6 and the cylindrical member 2 is composed of a curved surface and a flat surface. That is, the stress is concentrated from the inner wall surface of the cylindrical member 2 to the main surface of the first outward flange 3 through the curved surface of the curvature portion and further to the outer edge of the first outward flange 3. There is no step or tip. For this reason, even when an impact or stress is applied to the cylindrical member 2, stress concentration on the glass lens 6 can be prevented.

  Therefore, for example, even when the above-described electric welding or other external force is applied and stress is generated, the glass lens 6 is cracked to impair translucency and airtightness, or from the cylindrical member 2 to the glass lens 6. Can be prevented from falling off.

  In addition, the outer edge of the first outward flange 3 has a substantially endless curvature, and the main surface of the first outward flange 3 and the outer peripheral surface 3a do not continue in a curved manner. A discontinuous surface is formed with the corners as boundaries. For this reason, when the molten glass is adhered to the lens mounting hole 4 and fused to the cylindrical member 2, the flow of the molten glass spreading along the main surface of the first outward flange 3 has no curvature. Is stopped at the outer edge of the first outward flange 3 and the molten glass stays at the outer edge of the first outward flange 3 due to the surface tension of the molten glass.

  Therefore, the molten glass does not protrude from the outer edge of the first outward flange 3 without particularly providing a flow stopper for the molten glass as shown in FIG. It is possible to stay within the main plane of the.

  Accordingly, when the lid 1 with a lens 1 is mounted on a mounting substrate (not shown) as an optical semiconductor device, the glass lens 6 collides with other adjacent parts and is damaged or an external force is applied to the glass lens 6. It is possible to prevent cracks from occurring and impair the translucency and airtightness, and prevent the glass lens 6 from dropping from the cylindrical member 2.

  In addition, in the cover body 1 with a lens mentioned above, it is possible to fasten the molten glass on the main surface of the first outward flange 3 without providing the first outward flange 3 with a glass flow stopper such as a groove or a protrusion. However, the provision of these glass flow stoppers is not limited.

  FIG. 2 is a schematic diagram showing a test method for comparing the breaking strength of a conventional lid with a lens and the lid with a lens 1 of the present invention, wherein 1 is a lid with a lens, 2 is a cylindrical member, The second outward flange portion, 6 is a glass lens, and 7 is a pressure block.

  In FIG. 2, the lens-equipped lid 1 is placed on a plane with the glass lens 6 facing upward, and the cylindrical member 2 is placed between two parallel vertical planes of two pressure blocks 7 placed on the same plane. The second outward flange 5 is sandwiched. A test was conducted by applying a force to the second outward flange 5 with the pressure block 7 and setting the force at the time when the glass lens 6 was broken to the lateral pressing strength (breaking strength).

  As a result, as shown in FIG. 3, the conventional lid with lens has a lateral pushing strength of 17.2 N (average), whereas the lid with lens 1 of the present invention has a lateral pushing strength of 25.2 N (average). As a result, the strength was improved.

  FIG. 4 is a schematic view for comparing the effective light emission angles from the light emitting elements of the lid with a lens of the present invention and the conventional lid with a lens, and FIG. 4 (a) shows the effectiveness of the conventional lid with a lens. FIG. 4 (b) shows the effective angle of incidence in the lens-equipped lid body according to the present invention. In FIG. 4, 2 is a cylindrical member (the present invention), and 3 is a first outward flange. , 6 is a glass lens, 102 is a cylindrical member (conventional), 103 is an inward flange (conventional), 105 is a glass lens (conventional), and 201 is a light emitting element.

  4, the cylindrical diameters of the cylindrical member (conventional) 102 and the cylindrical member (present invention) 2 and the positions of the light emitting points of the light emitting elements 201 are the same. In this case, in the conventional configuration, the cylindrical member (conventional) 102 has an inwardly facing portion (conventional) 103 in the glass lens (conventional) 105, and the lens mounting hole of the cylindrical member (conventional) 102 is inwardly facing. Part (conventional) 103 of the inner diameter. On the other hand, in the configuration of the present invention, the lens mounting hole of the cylindrical member (present invention) 2 is B of the inner diameter itself of the cylindrical member (present invention) 2, and the inner diameter of the lens mounting hole is the conventional cylindrical shape. The inner diameter A of the member (conventional) 102 is larger than the inner diameter A, and the first outward flange 3 formed on the outer side of the cylindrical member (present invention) 2 does not become a factor for narrowing the effective incident angle.

  According to this, in the conventional configuration, the effective angle range of the incident light from the light emitting element 201 to the glass lens (conventional) 105 is X, whereas in the configuration of the present invention, from the light emitting element 201 to the glass lens 6. The effective angle range of the incident light is Y larger than X. Therefore, the light emitted from the light emitting element 201 can be used more efficiently than before.

  Such a lid body 1 with a lens can be manufactured by a known publicly known conventional method only by changing the shape of the conventional cylindrical member 102 to the shape of the cylindrical member 2 of the present invention. For example, it is possible to manufacture by assembling a columnar glass and a cylindrical member 2 into an assembly jig made of carbon, and heating the jig together with a heating furnace to fuse the glass and the columnar member 2. is there.

  INDUSTRIAL APPLICABILITY The present invention is useful as a lid with a lens for a semiconductor device that covers a light emitting / receiving element to obtain airtightness, and is particularly suitable for obtaining stress and mechanical strength due to vibration and the like.

The cover body with a lens in embodiment of this invention is shown, (a) is whole sectional drawing, (b) is principal part sectional drawing. Schematic diagram showing the fracture strength test method Graph showing the results of the sealing machine (lateral press) strength Schematic diagram comparing the effective angle range of lens incident light between the lid with lens of the present invention and the conventional lid with lens Sectional drawing which shows the cover body with the conventional lens Sectional view of the main part of a conventional lid with lens

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 Cover body with lens 2,102 Cylindrical member 3 First outward flange 3a Outer peripheral surface 4,104 Lens mounting hole 5 Second outward flange 6,105 Glass lens 7 Pressure block 103 Inward flange 106 Outward facing part 107 Protrusion part 108 Groove part 109 Step part 201 Light emitting element

Claims (2)

  A cylindrical member in which one opening forms a lens mounting hole, and a glass lens fused to the lens mounting hole, and an outward flange that extends radially outward around the one opening. And having a curved portion that forms a curved surface from the inner wall surface of the cylindrical member to the main surface of the outward flange, and the outer edge of the outward flange has a terminal end that has substantially no curvature, the glass The lens closes the lens mounting hole, and extends from the inner wall surface of the cylindrical member to the outer edge of the outward flange portion through the curved surface of the curvature portion and the main surface of the outward flange portion. A lensed lid.   The cylindrical member is made of metal, and the cylindrical member has the outward flange as a first outward flange extending radially outward around the one opening, and around the other opening. A second outward flange extending radially outward, wherein the first outward flange and the second outward flange are on both ends of the cylindrical member with the cylindrical member as an axial center; The lid body with a lens according to claim 1, wherein the lid body is bent outward substantially orthogonal to the lens body.

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