A thin printed flexible electrochemical cell, and its method of manufacture, using a \u201cpicture frame\u201d structure sealed, for example, with a high moisture and oxygen barrier polymer film and featuring, for example, a printed cathode deposited on an optional, highly conductive carbon printed cathode collector with a printed or a foil strip anode placed adjacent to the cathode. The first and second sets are combined to form first and second logs of cement bond, which are used to produce an enhanced log of the cement bond. After that, the case with the porous sintered member therein is taken out of the furnace, and is set in a recess of a press machine. The variation in writing property may be accomplished by varying the thickness of an underlayer to the information layer. The lens unit includes a lens positioned immediately behind a lens aperture of the casing. At the end of time interval the first count is compared to the second count and, based on the comparison, a decoded bit is generated.