Cover glass for solid imaging device, and its manufacturing method

Abstract

Cover glass (10) for solid image pickup device comprising a flat glass plate made of an inorganic oxide glass and, superimposed on the front and back, viewed in the direction of plate thickness, thereof, first translucent plane (11a) and second translucent plane (11b), wherein the first translucent plane (11a) is provided with thin film (20), and wherein an unevenness is provided at extreme edge (22) of the thin film (20) positioned at an outer edge on the first translucent plane (11a) of the flat glass plate, the unevenness having projection dimension (L) ranging from 0.5 to 50 m, the projection dimension (L) defined as extending from, on a plane parallel to the first translucent plane (11a), the most recessed position to the most protrudent position. Such a cover glass is produced through a process comprising the steps of melting a glass raw material mixture in a heat resistant vessel, molding the thus molten glass into a plate glass, providing the plate glass with a thin film and fracturing the plate glass with the thin film into small glass pieces.

Description

technical field [0001] The present invention relates to a cover glass that is arranged as a window material for transmitting light on a package housing a solid-state imaging device and protects the solid-state imaging device, and a method for manufacturing the same. Background technique [0002] CCD (Charge Coupled Device), which is a representative component of solid-state imaging devices, has a relatively early development history. Tubes (or also called vacuum tube imaging elements, image tubes) have been widely used, and their advantages of being small, impact-resistant, and low-power consumption have also been effectively utilized, so they are still widely used today. used in the field. That is, the CCD has overcome the disadvantages of low sensitivity compared with the image pickup tube, and by realizing various functions such as electronic shutter, hand vibration correction, zoom function, etc., it has the performance of replacing the camera that displays the image on...

AI Technical Summary

Problems solved by technology

[0011] In addition, especially in the cleanliness of a cover glass for a solid-state imaging device in which a thin film is formed on the glass surface, there is a problem that the periphery of the film peels off due to the passage of time after the film is formed, and the peeled off fine flakes float and adhere to the surface of the cover glass. Therefore, the cleanliness of the cover glass for solid-state imaging devices after film formation is an important issue to achieve high quality.

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