Phosphorescent marking system

Details Phosphorescent marking system Phosphorescent marking system

H - Electricity

05

B

345/6

H05B 33/00 (2006.01) B43L 1/00 (2006.01) B43L 1/12 (2006.01) G01J 1/58 (2006.01) G09F 13/42 (2006.01) H05B 33/10 (2006.01)

Patent

CA 1224865

ABSTRACT OF THE DISCLOSURE A device of phosphorescent material on which luminescent images are formed and retained for a period of time is disclosed. The device includes phosphorescent material in the form of a sheet mounted on a support. The support exposes the top surface of the phosphorescent material to activating light. A shield maintains deactivation of the phosphorescent material. Upon removal of the shield in a dark area, the phosphorescent material may be activated in selected areas to form an image which is retained for a period of time until the phosphorescent material has decayed to an inactivated state of imperceptible level of luminescence. This type of device is particularly suited to amusement and educational items for children. However, it is also useful in industrial applications where writing and communication of information in the dark is necessary.

483335

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