Recording method and recording device

A recording device comprising:

• a plurality of laser light-emitting elements;
• and
• an emitting unit including an optical fiber array, in which a plurality of optical fibers configured to guide laser light emitted from the laser light-emitting elements are aligned,
• wherein the recording device is configured to apply laser light emitted from the optical fiber array with moving a recording target and the optical fiber array relatively, to record an image formed of writing units,
• wherein a maximum length of the writing unit along a sub-scanning direction is controlled with set values of:
• a duty ratio and a cycle of a pulse signal input to the emitting unit;
• recording energy applied to the recording target;
• and a spot diameter of the laser light, to record with overlapping an edge of the writing unit with an edge of the adjacent writing unit in the sub-scanning direction, and
• wherein the writing units constituting the image satisfy a relationship represented by Mathematical Formula 1 below:
• 0<C−(1−D)T·Vs Mathematical Formula 1
• where, in Mathematical Formula 1, C is a maximum length of a swell of a writing unit in the sub-scanning direction relative to a distance L with which the laser light is emitted, D is a duty ratio of the pulse signal, T is a cycle of the pulse signal, and Vs is a traveling speed of the recording target relative to the optical fiber array.