| 摘要 |
PURPOSE:To prevent an erasing by unnecessary ultraviolet rays of the memory contents of an ultraviolet erasing type erasable and writable semiconductor memory storage by forming a light-transmitting section, through which ultraviolet rays are transmitted, on the back of a package. CONSTITUTION:A chip 41 for an ultraviolet erasing type erasable and writable semiconductor memory storage is disposed into a ceramic-case 42. A metallic cover 44 with a glass window 43 is hermetically sealed on the lower side of the ceramic-case 42 by a solder material 45. The noses of external leads 48 are projected to the window side to the chip 41. According to such constitution, the glass window 43 is projected to the back side. |
