Abstract: An optical recording medium of phase change type, and in particular, a dual side medium prepared by adhering two single side media is provided. In this medium, deformation of record marks generated in the overwriting due to difference in light absorption between the record marks and the region other than the record marks is prevented by providing a reflective layer of high light transmission, and increase in jitter and failure of track servo and focus servo caused by uneven coating of the adhesive layer and the resin protective layer are prevented. The optical recording medium comprises a substrate, a recording layer of phase change type on the surface side of the substrate, and a reflective layer and a light absorption layer disposed in this order on the surface side of the recording layer.

Abstract: In bubble jet heater dies, a photolithographic process is disclosed to form patterned photoresist structures having re-entrant angles to facilitate an improved lift-off structure for anti-cavitation layer deposition. A substrate is coated with a photoresist which includes 0.5% to 1.0% Monazoline C. When exposed to Ultra-Violet light and developed, apertures in the photoresist have inverted side walls. Anti-cavitation material, such as tantalum, is then sputtered onto the substrate and the photoresist to form patterned metal. structures. The lift-off of the patterned photoresist is easily performed leaving behind the patterned metal structures. The use of this lift-off deposition method prevents stress-cracking in the anti-cavitation layer seen in deposition and etch methods.

Abstract: An optical recording medium comprising a substrate (1), a colorant recording layer (2) on and from which information is capable of being recorded and reproduced, provided on said substrate (1), an intermediate layer (3) provided on said colorant recording layer (2), said intermediate layer (3) comprising a material that is transparent to recording-reproducing light, has a lower refractive index than that of a colorant contained in said colorant recording layer (2) and is soluble to an aliphatic or alicyclic hydrocarbon solvent, and a metal reflective layer (4) provided on said intermediate layer (3). A useful process for producing such a optical recording medium is also disclosed.

Abstract: A method for the preparation a photo-mask used for photo-imaging selected areas on the surfaces of a three-dimensional printed circuit board substrate. The photo-mask comprises a membrane transparent and degradation resistant to UV light, having at least one side with a contoured shape conforming, and flexible enough to comply with surface irregularities on the surfaces of the three-dimensional substrate being photo-imaged. A pattern of tracks opaque to UV light is posiitoned along the contoured shape of the membrane. The pattern of tracks on the photo-mask is in accordance with a desired conductive metal trace pattern on the surfaces of the three-dimensional printed circuit board substrate. The photo-mask is prepared by photo-imaging and then depositing a track material on a film that conformed to the surfaces of the three-dimensional substrate. An adhesive layer applied over the film cements a membrane material poured upon the adhesive layer.