Exposure device
View Patent ↗The invention provides an exposure device that can conduct digital exposure with high precision and with a high light-use efficiency using evanescent light. Light that is modulated by a DMD and condensed by a microlens array is incident at corresponding optical fiber cores arranged in a matrix in an evanescent array head, and is guided through the insides of the optical fibers. Because the light condensed by the microlens array is incident at the optical fiber cores corresponding to the microlenses, the light can be efficiently incident. Evanescent light leaks out from micro-openings formed in emission-side end portions of the optical fibers, and a photosensitive material is exposed by this evanescent light.
1. An exposure device comprising:
a light source that emits light beams for illumination;
a spatial light modulator in which a plurality of pixel portions whose respective light modulation states change in correspondence to control signals are two-dimensionally arranged and which modulates, per pixel portion, the light beams that are incident at the plurality of pixel portions from the light source;
a microlens array in which a plurality of microlenses are two-dimensionally arranged at a pitch corresponding to the plurality of pixel portions and which condenses, per microlens, the light beams modulated by the pixel portions; and
a head portion where incident ends of a plurality of optical fibers whose emission ends are tapered are two-dimensionally arranged at a pitch corresponding to condensing positions of the plurality of microlenses,
wherein a photosensitive material is exposed by evanescent light leaking out from the emission ends of the plurality of optical fibers.
2. The exposure device of claim 1 , wherein the incident ends of the plurality of optical fibers are fixedly disposed and the emission ends of the plurality of optical fibers are movable.
3. The exposure device of claim 1 , wherein the light source includes a light source that emits laser light.
4. The exposure device of claim 3 , wherein the wavelength of the laser light is in the range of 350 nm or greater and 450 nm or less.
5. The exposure device of claim 3 , wherein the wavelength of the laser light is about 400 nm.
6. The exposure device of claim 1 , wherein the light source includes a plurality of semiconductor laser light sources, and the light beams from the plurality of semiconductor laser light sources are multiplexed.
7. The exposure device of claim 1 , wherein the spatial light modulator includes a digital micromirror device.
8. The exposure device of claim 1 , wherein the beam diameters of the light beams condensed by the microlens array have a size substantially equivalent to core diameters of the plurality of optical fibers of the head portion.
9. The exposure device of claim 1 , wherein at least one micro-opening is formed in an apex of the emission end of each optical fiber in the head portion.