US-12624828-B2 - Light source device

Abstract

A light source device includes: a plurality of light emitting parts, each having an upper surface that includes a light emitting surface; an optical lens located above the light emitting surfaces of the light emitting parts, the optical lens having: a first surface including a first incident region, and a second surface including a second incident region; and a light converging member located between the light emitting parts and the optical lens, the light converging member including: a light entering portion, corresponding to a first of the plurality of light emitting parts and covering the light emitting surface of the first light emitting part, and a light emission portion, corresponding to the light entering portion. The light converging member includes a first light-reflective member and a unit light converging portion having the light entering portion and the light emission portion.

Inventors

• Tsuyoshi OKAHISA
• Norimasa Yoshida

Assignees

• NICHIA CORPORATION

Dates

Publication Date

20260512

Application Date

20250620

Priority Date

20200123

Claims (18)

1. 1 . A light source device comprising: a plurality of light emitting parts, each having an upper surface that comprises a light emitting surface; an optical lens located above the light emitting surfaces of the light emitting parts, the optical lens having: a first surface comprising a first incident region, and a second surface comprising a second incident region; and a light converging member located between the light emitting parts and the optical lens, the light converging member comprising: a light entering portion, corresponding to a first of the plurality of light emitting parts and covering the light emitting surface of the first light emitting part, and a light emission portion, corresponding to the light entering portion; wherein the light converging member comprises a first light-reflective member and a unit light converging portion having the light entering portion and the light emission portion, wherein at least a lateral side of the unit light converging portion is covered with or defined by the first light-reflective member.
2. 2 . The light source device according to claim 1 , wherein the light converging member is bonded with at least the first light emitting part.
3. 3 . The light source device according to claim 1 , wherein the light converging member is a monolithic single member formed by the first light-reflective member.
4. 4 . The light source device according to claim 3 , wherein the first light emitting part comprises a light emitting element, a wavelength conversion member covering an upper surface of the light emitting element, and a second light-reflective member covering lateral surfaces of the light emitting element and lateral surfaces of the wavelength conversion member, and wherein the second light-reflective member is bonded with the monolithic single member.
5. 5 . The light source device according to claim 1 , wherein the first light emitting part comprises a light emitting element, a wavelength conversion member covering an upper surface of the light emitting element, and a second light-reflective member covering lateral surfaces of the light emitting element and lateral surfaces of the wavelength conversion member, and wherein the second light-reflective member is bonded with the first light-reflective member.
6. 6 . The light source device according to claim 1 , wherein the first light emitting part comprises a light emitting element, and a second light-reflective member covering lateral surfaces of the light emitting element, and the light source device comprises a wavelength conversion member that continuously covers an upper surface of the light emitting element and an upper surface of the second light-reflective member.
7. 7 . The light source device according to claim 1 , wherein the plurality of light emitting parts are arranged in a matrix, and wherein a size of a light emitting surface of a light emitting part located at a center of the matrix differs from a size of a light emitting surface of a light emitting part located at a corner of the matrix.
8. 8 . The light source device according to claim 1 , wherein the plurality of light emitting parts are arranged in a matrix, and wherein a size of a light emitting surface of a light emitting part located at a center of the matrix is larger than a size of a light emitting surface of a light emitting part located at a corner of the matrix.
9. 9 . The light source device according to claim 1 , wherein the plurality of light emitting parts are arranged in a matrix, and wherein a size of a light emitting surface of a light emitting part located at a corner of the matrix is larger than a size of a light emitting surface of a light emitting part located at a center of the matrix.
10. 10 . The light source device according to claim 1 , wherein an area of the light emission portion is smaller than an area of the light entering portion.
11. 11 . The light source device according to claim 1 , wherein the unit light converging portion is a frustum lens, having an upper surface and a lower surface and covering the light emitting surface of the first light emitting part, wherein the lower surface of the frustum lens serves as the light entering portion, wherein the upper surface of the frustum lens serves as the light emission portion.
12. 12 . The light source device according to claim 1 , wherein the unit light converging portion is a cavity, having a first opening on a light emitting part side and a second opening on an optical lens side, wherein the first opening of the cavity serves as the light entering portion, and wherein the second opening of the cavity serves as the light emission portion.
13. 13 . The light source device according to claim 1 , further comprising: a first lens that covers the light emission portion of the light converging member, wherein a light emitted from the light emission portion of the light converging member enters the first lens at a first full-width half-maximum, is emitted from the first lens at a second full-width half-maximum smaller than the first full-width half-maximum, and enters the optical lens.
14. 14 . The light source device according to claim 13 , wherein the first lens covers the light emission portion and has at least one convex surface on an optical lens side.
15. 15 . The light source device according to claim 1 , wherein each of the light emitting parts and each of irradiation regions that correspond to the each of the respective light emitting parts are in a point-symmetric arrangement relationship.
16. 16 . The light source device according to claim 1 , wherein the plurality of light emitting parts are arranged in a matrix of m rows and n columns.
17. 17 . The light source device according to claim 1 , wherein at least some of the plurality of light emitting parts are configured to be individually turned on.
18. 18 . A camera flash comprising the light source device according to claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 18/903,082, filed on Oct. 1, 2024, which is a continuation of U.S. patent application Ser. No. 17/153,546, filed on Jan. 20, 2021 (now U.S. Pat. No. 12,152,769), which claims priority to Japanese Patent Application No. 2020-151304, filed on Sep. 9, 2020, Japanese Patent Application No. 2020-028323, filed on Feb. 21, 2020, and Japanese Patent Application No. 2020-009419, filed on Jan. 23, 2020. The entire contents of these application are hereby incorporated by reference. BACKGROUND The present disclosure relates to a light source device. Recently, light sources including a plurality of light emitting parts, such as light emitting diodes, have been used widely. For example, JP 5275557 B1 describes a light source that can be used for a flash in a small camera, such as a camera incorporated in a mobile phone. SUMMARY Such a light source for use in, for example, a flash for a camera, must irradiate a desired irradiation region with a sufficient amount of light, among individual irradiation regions demarcated from the whole irradiation area. In view of this, one object of the present disclosure is to provide a light source device that can irradiate a desired irradiation region with a sufficient amount of light. A light source device according to one embodiment of the present disclosure includes: a plurality of light emitting parts, each having an upper surface and a light emitting surface on the upper surface; an optical lens located above the light emitting surfaces of the light emitting parts, the optical lens having: a first surface located on a light emitting surface side of the light emitting part, the first surface including a plurality of incident regions each corresponding to a respective one of the plurality of light emitting parts such that a light emitted from each of the light emitting parts is incident on a respective one of the plurality of incident regions, and a second surface opposite to the first surface, the second surface including a plurality of emission regions each corresponding to a respective one of the plurality of incident regions; and a light converging member located between the light emitting parts and the optical lens, the light converging member including: a plurality of light entering portions, each of the plurality of light entering portions corresponding to a respective one of a plurality of light emitting parts and covering the light emitting surface of the respective one of the light emitting parts, and a plurality of light emission portions, each of the plurality of light emission portions corresponding to a respective one of the plurality of light entering portions and having an area smaller than an area of the respective one of the plurality of light entering portions, such that two or more irradiation regions are irradiated with lights emitted from corresponding two or more of the plurality of light emitting parts. A light source device according to another embodiment of the present disclosure includes: a plurality of light emitting parts, each having a light emitting surface on an upper surface thereof; an optical lens located above the light emitting surfaces of the light emitting parts, the optical lens having: a first surface including a first incident region, and a second surface including a first emission region; and a light converging member located between the light emitting parts and the optical lens, the light converging member including: a plurality of light entering portions, each of the plurality of light entering portions corresponding to a respective one of the plurality of light emitting parts and covering the light emitting surface of the respective one of the light emitting parts, and a plurality of light emission portions, each of the plurality of light emission portions corresponding to a respective one of the plurality of light entering portions and having an area smaller than an area of the respective one of the plurality of light entering portions, such that two or more irradiation regions are irradiated with lights emitted from corresponding two or more of the plurality of light emitting parts. The light source device according to certain embodiments of the present disclosure can irradiate the desired irradiation region with a sufficient amount of light. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view of a light source for a flash according to a first embodiment of the present disclosure. FIG. 2A is a schematic top view for explaining the arrangement of light emitting parts in the light source for a flash shown in FIG. 1. FIG. 2B is a schematic top view of light emitting parts when the light emitting parts have light emitting surfaces with different sizes in the light source for a flash shown in FIG. 1. FIG. 2C is a schematic top view of light emitting parts when the light emitting parts have light emitting surface