Hiroyoshi Matsumura

TL;DR: In this paper, an optical device for transmitting an image wherein a number of optical fibers are disposed in such a manner that they are arranged neatly in the same relative position among them, at least, both ends thereof, each of said fibers having such a refractive index distribution as to substantially satisfy the equation n = N (1 - ar2) in a cross section triangle, where n is a center, r is a distance r from the center, and a is a positive constant, whereby light due to an object placed at one end of the optical fibers forms an image of

TL;DR: By heat treating a glass member containing at least one kind of modifying oxide in contact with a source of another kind of cation to cause ion substitution, a light-conducting glass structure can be produced to have a refractive index distribution wherein the index varies progressively transversely to the intended light path, which is thereby bent toward the direction of increase of the index as mentioned in this paper.

TL;DR: In this article, the authors describe a light-constrained multilens or face plate composed of at least two sets of contours and two light-consisting contours.

TL;DR: A transparent glass body having a light focusing effect and a refractive index decreasing progressively from its centerline outward and containing readily reducible metal oxides in at least the outer peripheral part thereof is caused to contact a gas having a reducing effect, thereby forming a light-absorbent layer of metal colloid in the outer periphery as mentioned in this paper.

TL;DR: By heat treating a glass member containing at least one kind of modifying oxide in contact with a source of another kind of cation to cause ion substitution, a light-conducting glass structure can be produced to have a refractive index distribution wherein the index varies progressively transversely to the intended light path, which is thereby bent toward the direction of increase of the index as mentioned in this paper.