LIGHT ILLUMINATING APPARATUS

• US 20190011112A1
• Filed: 07/03/2018
• Published: 01/10/2019
• Est. Priority Date: 07/07/2017
• Status: Active Grant

• Current Assignee: Hoya Candeo Optronics Corporation (Hoya Corporation)
• Original Assignee: Hoya Candeo Optronics Corporation (Hoya Corporation)
• Inventors: SHITO, Kazutaka
• Granted Patent: US 10,641,461 B2
• Time in Patent Office: Days
• CPC Class Codes: B41F 23/0409 Ultraviolet dryers
• CPC Class Codes: B41F 23/0453 by ultraviolet dryers
• CPC Class Codes: B41J 11/00214 using UV radiation
• CPC Class Codes: B41M 5/0011 Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating after-treatment of prints B41M7/00; printers for treating or overcoating copy materials before, during or after printing B41J11/0015
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21V 7/06 with parabolic curvature
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light illuminating apparatus for irradiating light of a line shape extending in a first direction and having a predetermined line width in a second direction perpendicular to the first direction, includes a light emitting unit including a substrate, and a plurality of light sources arranged at a predetermined interval along the first direction on the substrate such that an optical axis is matched to a third direction perpendicular to the first and second directions, and a mirror unit having a mirror surface to reflect and focus the light. In a cross section of the mirror unit taken along a plane defined by the second direction and the third direction, a cross-sectional shape of the mirror surface is a curved shape resulting from rotation of each of a horizontal axis direction positive side part and a horizontal axis direction negative side part of a parabola y=ax².

Claims

1. A light illuminating apparatus for irradiating, to a predetermined irradiation position on a reference irradiation surface, light of a line shape extending in a first direction and having a predetermined line width in a second direction perpendicular to the first direction, the light illuminating apparatus comprising:

a light emitting unit comprising a substrate, and a plurality of light sources arranged at a predetermined interval along the first direction on the substrate such that a direction of an optical axis is matched to a third direction perpendicular to the first direction and the second direction; and

a mirror unit having a mirror surface to reflect and focus the light irradiated from the light emitting unit,

wherein in a cross section of the mirror unit taken along a plane defined by the second direction and the third direction, a cross-sectional shape of the mirror surface is a curved shape resulting from rotation of each of a horizontal axis direction positive side part and a horizontal axis direction negative side part of a parabola y=ax² (a is coefficient) in coordinates where the second direction is a horizontal axis x and the third direction is a vertical axis y, around an origin at a same rotation angle θ

toward the vertical axis.

2. The light illuminating apparatus according to claim 1, wherein the coefficient a of the parabola is 1-3.

3. The light illuminating apparatus according to claim 1, wherein the rotation angle θ

is 3-10°

.

4. The light illuminating apparatus according to claim 1, wherein the curved shape is also a shape resulting from movement of each of the horizontal axis direction positive side part and the horizontal axis direction negative side part of the parabola after the rotation to the vertical axis side along the horizontal axis.

5. The light illuminating apparatus according to claim 4, wherein a movement distance of each of the horizontal axis positive side part and the horizontal axis negative side part of the parabola after the rotation to the vertical axis side is 0.5-4 mm.

6. The light illuminating apparatus according to claim 1, wherein the light source is disposed at an offset position in the third direction from the origin.

7. The light illuminating apparatus according to claim 6, wherein an offset quantity of the light source from the origin is 3-7 mm.

8. The light illuminating apparatus according to claim 1, wherein the light emitting unit has an encapsulation lens disposed on the substrate, covering each light source.

9. The light illuminating apparatus according to claim 1, wherein the light is light of a wavelength that acts on an ultraviolet curable resin.

10. The light illuminating apparatus according to claim 2, wherein the rotation angle θ

is 3-10°

.

11. The light illuminating apparatus according to claim 2, wherein the curved shape is also a shape resulting from movement of each of the horizontal axis direction positive side part and the horizontal axis direction negative side part of the parabola after the rotation to the vertical axis side along the horizontal axis.

12. The light illuminating apparatus according to claim 3, wherein the curved shape is also a shape resulting from movement of each of the horizontal axis direction positive side part and the horizontal axis direction negative side part of the parabola after the rotation to the vertical axis side along the horizontal axis.

13. The light illuminating apparatus according to claim 10, wherein the curved shape is also a shape resulting from movement of each of the horizontal axis direction positive side part and the horizontal axis direction negative side part of the parabola after the rotation to the vertical axis side along the horizontal axis.

14. The light illuminating apparatus according to claim 11, wherein a movement distance of each of the horizontal axis positive side part and the horizontal axis negative side part of the parabola after the rotation to the vertical axis side is 0.5-4 mm.

15. The light illuminating apparatus according to claim 12, wherein a movement distance of each of the horizontal axis positive side part and the horizontal axis negative side part of the parabola after the rotation to the vertical axis side is 0.5-4 mm.

16. The light illuminating apparatus according to claim 13, wherein a movement distance of each of the horizontal axis positive side part and the horizontal axis negative side part of the parabola after the rotation to the vertical axis side is 0.5-4 mm.