| 摘要 |
PURPOSE:To enable the formation of a non-distorted image high in resolution on a printed board by a method wherein a positive type photosensitive resin resist film formed on a board is exposed to light rays through the intermediary of a positive type mask, which is moreover subjected to a heat treatment. CONSTITUTION:A positive type resist film containing quinone diazide as a photosensitive material is formed on a circuit board provided with a conductive film through an electrodeposition coat, which is exposed to light through the intermediary of a positive type mask and subjected to a heat treatment before a developing treatment. Therefore, a positive type photosensitive electrodeposition coating material can be easily applied onto a copper foil through an electrodeposition coat, and this photosensitive film is irradiated with light rays to make the exposed quinone diazide compound change into indene carboxylic acid highly soluble in a developing solution, which is subjected to a heat treatment to promote the non-exposed part of the film to be high in insolubility through a diazo coupling reaction. By these processes, an image high in resolution can be obtained by developing with an alkaline developing solution. |
