| 摘要 |
PURPOSE:To obtain an excellent light transmitting characteristics, bonding strength and airtight characteristic by forming a projection or a groove at the bonding part of a cap having a light emitting window and a light emitting window member and hermetically sealing it through a bonding member. CONSTITUTION:A kovar or iron-nickel alloy is used as a material of a cap 1 having a light transmitting window 2, is formed by pressing in a cap shape, and V-shaped groove of approx. 70 deg. of the end angle of the groove with the depth of approx. 0.1mm. is annularly arranged at the end of a molding punch, thereby simultaneously forming a projection according to this invention. The cap 1 is heated in acidic atmosphere at approx. 700 deg.C, an oxidative film is formed on the surface, and a low melting point glass to be coated on the cap is strongly hermetically bonded. The glass is coated on the hermetically sealing part 3 of the cap 1 with the window member 14, and is heated to approx. 500 deg.C, thereby performing the hermetical seal. A photosemiconductor element 7 is placed on the cap 1, and a base bonded with the lead terminal 8 is welded and secured, thereby hermetically sealing the element 7. |
