Patent ID: 6275247
Filing Date: 2001-08-14
Classification: B41J

Abstract:
An optical printer apparatus for printing on a photosensitive medium, said optical printer apparatus comprising:a light source, composed of light emitting diodes (LEDs), for emitting a light for exposure of the photosensitive medium; anda conversion means for converting light from said light source to light in the form of a line in the longitudinal direction; whereinsaid photosensitive medium is irradiated and exposed, at a predetermined timing, by the light converted from said light source, wherein said light source is caused to make a relative motion with respect to the photosensitive medium in the direction perpendicular to said line in the longitudinal direction so that an image is produced on the photosensitive medium; andsaid LEDs are fixedly mounted on a LED mounting substrate in the form of at least one pair of LEDs consisting of two LEDs of the same color in a fashion such that two LEDs of the pair are arranged leaving an interval therebetween and substantially symmetrical with each other with respect to the center of said line in the longitudinal direction, and further, a power supplying lead wire which connects the upper surface of one of the LEDs of the pair with said LED mounting substrate is substantially symmetrical with a power supplying lead wire which connects the upper surface of the other of the LEDs of the pair with said LED mounting substrate with respect to the center of said line in the longitudinal direction.