1. A glass processing method comprising the steps of:
(i) condensing a laser pulse with a wavelength \u03bb through a lens to irradiate glass and form an altered portion in a portion of the glass irradiated with the laser pulse; and
(ii) etching the altered portion using an etchant having a greater etching rate for the altered portion than for the glass,
the laser pulse having a pulse width ranging from 1 ns to 200 ns,
the wavelength \u03bb being 535 nm or less,
the glass having an absorption coefficient of 50 cm\u22121 or less at the wavelength \u03bb,
the lens having a focal length L (mm) that produces a value of 7 or greater when divided by a beam diameter D (mm) of the laser pulse incident on the lens, and
the glass being substantially free from gold and silver.
2. The method according to claim 1, wherein the wavelength \u03bb is 360 nm or less.
3. The method according to claim 1, wherein the laser pulse is a harmonic of a Nd:YAG laser, a Nd:YVO4 laser, or a Nd:YLF laser.
4. The method according to claim 1, wherein the etchant is an aqueous solution of hydrogen fluoride.
5. The method according to claim 1, wherein the etchant is an aqueous solution of sulfuric acid, nitric acid, or hydrogen chloride.
6. The method according to claim 1, wherein, in the step (i), the laser pulse is focused inside the glass, or at a position within a 1.0 mm distance from and behind a back surface of the glass.
7. A processing device for processing glass by irradiation with a laser beam, the device comprising:
a light source that emits a laser pulse having a pulse width of 1 ns to 200 ns and a wavelength \u03bb; and
a lens through which the laser pulse is condensed to irradiate the glass,
the wavelength \u03bb being 535 nm or less, and
the lens having a focal length L (mm) that produces a value of 7 or greater when divided by a beam diameter D (mm) of the laser pulse incident on the lens.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A light guide plate, comprising a light emitting surface, a bottom surface, and a first light incident surface and a second light incident surface connected to the light emitting surface and the bottom surface and opposite to each other, wherein the light guide plate comprising:
a plurality of first hollow portions, disposed on the light emitting surface, and arranged on a first axis; and
a plurality of second hollow portions, disposed on the light emitting surface, and arranged on a second axis, wherein the first axis and the second axis are parallel and adjacent to each other, the first axis is perpendicular to the first light incident surface and the second light incident surface, and a plurality of orthogonal projections of the second hollow portions on the first axis and the first hollow portions are alternately arranged.
2. The light guide plate according to claim 1, the bottom surface opposite to the light emitting surface.
3. The light guide plate according to claim 1, wherein the first light incident surface and the light emitting surface intersect at a first line segment, the second light incident surface and the light emitting surface intersect at a second line segment, and a length of the first line segment and a length of the second line segment are respectively shorter than a length of the light emitting surface along the first axis.
4. The light guide plate according to claim 1, wherein the bottom surface is an arc surface.
5. The light guide plate according to claim 1, wherein the bottom surface is ladder-shaped.
6. The light guide plate according to claim 1, wherein every two adjacent first hollow portions are spaced by a first distance, every two adjacent second hollow portions are spaced by a second distance, and the first distance is equal to the second distance.
7. The light guide plate according to claim 6, wherein the orthogonal projection of one of the second hollow portions on the first axis is at a middle point of the first distance.
8. The light guide plate according to claim 1, wherein the bottom surface approaches the light emitting surface gradually along a first direction away from the first light incident surface and along a second direction away from the second light incident surface.
9. The light guide plate according to claim 1, wherein the bottom surface is away from the light emitting surface gradually along a first direction away from the first light incident surface and along a second direction away from the second light incident surface.
10. A backlight module, comprising:
a light guide plate, comprising a light emitting surface, a bottom surface, and a first light incident surface and a second light incident surface connected to the light emitting surface and the bottom surface and opposite to each other, the light guide plate further comprising:
a plurality of first hollow portions, disposed on the light emitting surface, and arranged on a first axis; and
a plurality of second hollow portions, disposed on the light emitting surface, and arranged on a second axis, wherein the first axis and the second axis are parallel and adjacent to each other, the first axis is perpendicular to the first light incident surface and the second light incident surface, and a plurality of orthogonal projections of the second hollow portions on the first axis and the first hollow portions are alternately arranged; and
two light sources, disposed beside the first light incident surface and the second light incident surface of the light guide plate respectively.
11. The backlight module according to claim 10, the bottom surface opposite to the light emitting surface.
12. The backlight module according to claim 10, wherein the first light incident surface and the light emitting surface intersect at a first line segment, the second light incident surface and the light emitting surface intersect at a second line segment, and a length of the first line segment and a length of the second line segment are respectively shorter than a length of the light emitting surface along the first axis.
13. The backlight module according to claim 10, wherein the bottom surface is an arc surface.
14. The backlight module according to claim 10, wherein the bottom surface is ladder-shaped.
15. The backlight module according to claim 10, wherein every two adjacent first hollow portions are spaced by a first distance, every two adjacent second hollow portions are spaced by a second distance, and the first distance is equal to the second distance.
16. The backlight module according to claim 15, wherein the orthogonal projection of one of the second hollow portions on the first axis is at a middle point of the first distance.
17. The backlight module according to claim 10, wherein the bottom surface approaches the light emitting surface gradually along a first direction away from the first light incident surface and along a second direction away from the second light incident surface.
18. The backlight module according to claim 10, wherein the bottom surface is away from the light emitting surface gradually along a first direction away from the first light incident surface and along a second direction away from the second light incident surface.