Half tone picture recording method

Abstract

Abstract PURPOSE:To improve resolution of a recording picture, by constituting a picture element of matrix arrangement of a minute picture element, setting a half tone gradation characteristic of its picture recording, as a straight line corresponding to the number of black minute picture elements and the recording density, and elevating its linearity. CONSTITUTION:When recording a half tone gradation characteristic of picture recording, signal width of a driving pulse for controlling a minute picture element irradiating period of a recording optical spot is set to time width corresponding to space recording width (b) which is narrower than block width (a) of a minute picture element. A recording optical image which becomes a differentiated shape, by denoting a radius of this optical spot as (c), and obtaining the relation of (b a-2c) between the block width (a) and the space recording width (b) is stored and recorded in a minute picture element block of the block width (a). Size of each minute picture element of this picture element matrix is changed in order and is increased, and also the driving pulse width for controlling the optical spot irradiating period for storing the minute picture element is increased in order. Also, the pulse width is varied in accordance with lateral width of the minute picture element, its linearity is elevated, and resolution of a recording picture is improved.

Inventors

• 👤 Naoto Kawamura
• 👤 尚登 河村

Bibliographic Details