Luminous dial plate structure for watches
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 20, 1995
Grant Date -
N/A
app pub date -
Jul 26, 1994
filing date -
Jul 27, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Provided is a luminous dial plate structure for watches, relatively high in luminance, sufficiently long in visual time and abundant in ornamental effect. The dial plate structure is composed of a lower plate and an upper member. The lower plate is made of a metal such as brass. The upper surface of the lower plate is coated with a phosphorescence-maintaining luminous agent made of a rare-earth element metal oxide. The surface of phosphorescence-maintaining luminous agent is coated with clear lacquer serving as a sealing material. The upper member is made of a thin transparent or translucent material, on which a time indication scale is provided. The upper member is bonded through an adhesive onto the upper surface of clear lacquer. In a bright place the dial plate shows such an indication that the time indication scale on the upper member is directly seen, while in a dark place the phosphorescence-maintaining luminous agent illuminates the upper member from the back to make the time indication scale visually observed as black shadows.
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