US-12624810-B2 - Lighting device

US12624810B2US 12624810 B2US12624810 B2US 12624810B2US-12624810-B2

Abstract

Provided is a lighting device, comprising: a light source module comprising: at least one light source disposed on a printed circuit board; and a resin layer disposed on the printed circuit board so that the light source is embedded; a light reflection member formed on at least any one of one side surface and another side surface of the resin layer; and a diffusion plate having an upper surface formed on the light source module, and a side wall which is integrally formed with the upper surface and formed to extend in a lower side direction and which is adhered onto the light reflection member, wherein a first separated space is formed between the light source module and the upper surface of the diffusion plate, whereby flexibility of the product itself can be secured, and durability and reliability of the product can be also improved.

Inventors

Kwang Ho Park
Chul Hong Kim
Hyun Duck YANG
Moo Ryong Park
Jun Chul HYUN

Assignees

LG INNOTEK CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20240808
Priority Date: 20120618

Claims (20)

1 . A light source module for vehicle lamps, comprising: a substrate; a heat dissipation member disposed below the substrate; a plurality of light sources disposed on the substrate; a resin layer disposed on the substrate and covering the plurality of light sources; and an optical pattern layer disposed on the resin layer, wherein the plurality of light sources are side view type light-emitting elements configured to emit light toward a side of the resin layer, wherein the optical pattern layer comprises a first optical sheet disposed on the resin layer, a second optical sheet disposed on the first optical sheet, a plurality of optical patterns disposed between the first optical sheet and the second optical sheet, and an adhesive layer disposed between the first optical sheet and the second optical sheet, wherein a part of the adhesive layer is disposed between the plurality of optical patterns and an upper surface of the first optical sheet or a lower surface of the second optical sheet, and wherein an air gap is disposed around each of the plurality of optical patterns to separate the adhesive layer from the optical patterns.
2 . The light source module for vehicle lamps of claim 1 , wherein the optical pattern layer comprises one or more optical sheets disposed on the second optical sheet.
3 . The light source module for vehicle lamps of claim 1 , wherein the plurality of light sources are arranged in a row in a longitudinal direction of the substrate and includes a region in which intervals between adjacent light sources among the plurality of light sources are different.
4 . The light source module for vehicle lamps of claim 1 , wherein the optical pattern layer is aligned with the plurality of light sources.
5 . The light source module for vehicle lamps of claim 1 , wherein the adhesive layer comprises a first region overlapping with the plurality of optical patterns and a second region not overlapping with the plurality of optical patterns.
6 . The light source module for vehicle lamps of claim 5 , wherein a thickness of the first region of the adhesive layer includes a region that is different from a thickness of the second region.
7 . The light source module for vehicle lamps of claim 5 , wherein a thickness of the plurality of optical patterns includes a region that is thicker than a thickness of the first region of the adhesive layer.
8 . The light source module for vehicle lamps of claim 5 , wherein the air gap includes a plurality of air gaps.
9 . The light source module for vehicle lamps of claim 8 , wherein a size of at least one of the plurality of air gaps is different from sizes of other air gaps.
10 . The light source module for vehicle lamps of claim 1 , wherein the plurality of optical patterns includes a light shielding pattern that blocks part of light emitted from the plurality of light sources.
11 . The light source module for vehicle lamps of claim 1 , wherein the plurality of optical patterns includes a region in which a pattern density decreases or a size of the optical patterns decreases as distance from the light sources increases.
12 . The light source module for vehicle lamps of claim 1 , wherein the plurality of optical patterns includes a plurality of patterns stacked in a thickness direction of the resin layer.
13 . The light source module for vehicle lamps of claim 12 , wherein the stacked plurality of patterns includes a diffusion pattern and a light shielding pattern.
14 . The light source module for vehicle lamps of claim 12 , wherein the stacked plurality of patterns includes a first diffusion pattern, a second diffusion pattern, and a light shielding pattern disposed between the first diffusion pattern and the second diffusion pattern.
15 . The light source module for vehicle lamps of claim 1 , wherein the plurality of optical patterns includes light shielding ink.
16 . The light source module for vehicle lamps of claim 1 , comprising a reflection unit disposed between the resin layer and the substrate.
17 . A lighting device for vehicle lamps, comprising: a substrate; a heat dissipation member disposed below the substrate; a plurality of light sources disposed on the substrate; a resin layer disposed on the substrate and covering the plurality of light sources; an optical pattern layer disposed on the resin layer; and a diffusion plate or a plurality of micro lenses disposed on the optical pattern layer, wherein the plurality of light sources are side view type light-emitting elements configured to emit light toward a side of the resin layer, and wherein the optical pattern layer comprises a first optical sheet disposed on the resin layer, a second optical sheet disposed on the first optical sheet, a plurality of optical patterns disposed between the first optical sheet and the second optical sheet, and an adhesive layer disposed between the first optical sheet and the second optical sheet, wherein a part of the adhesive layer is disposed between the plurality of optical patterns and the first optical sheet, and wherein an air gap is disposed around each of the plurality of optical patterns to separate the adhesive layer from the optical patterns.
18 . The lighting device for vehicle lamps of claim 17 , comprising a first air gap disposed between an upper surface of the diffusion plate and the resin layer.
19 . The lighting device for vehicle lamps of claim 18 , wherein a thickness of the first air gap is greater than 0 and less than or equal to 30 mm.
20 . The lighting device for vehicle lamps of claim 17 , wherein the optical pattern layer comprises one or more optical sheets disposed on the second optical sheet.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. application Ser. No. 18/350,450, filed Jul. 11, 2023; which is a continuation of U.S. application Ser. No. 17/647,302, filed Jan. 6, 2022, now U.S. Pat. No. 11,739,899, issued Aug. 29, 2023; which is a continuation of U.S. application Ser. No. 16/819,656, filed Mar. 16, 2020, now U.S. Pat. No. 11,248,764, issued Feb. 15, 2022; which is a continuation of U.S. application Ser. No. 15/900,358, filed Feb. 20, 2018, now U.S. Pat. No. 10,627,064, issued Apr. 21, 2020; which is a continuation of U.S. application Ser. No. 15/495,433, filed Apr. 24, 2017, now U.S. Pat. No. 9,933,126, issued Apr. 3, 2018; which is a continuation of U.S. application Ser. No. 14/742,207, filed Jun. 17, 2015, now U.S. Pat. No. 9,664,844, issued May 30, 2017; which is a continuation of U.S. application Ser. No. 13/920,844, filed Jun. 18, 2013, now U.S. Pat. No. 9,086,209, issued Jul. 21, 2015; which claims the benefit under 35 U.S.C. § 119 of Korean Patent Application Nos. 10-2012-0065259, filed Jun. 18, 2012; 10-2012-0065260, filed Jun. 18, 2012; and 10-2012-0065264, filed Jun. 18, 2012; which are hereby incorporated by reference in their entirety. BACKGROUND Field of the Invention Embodiments of the present invention relate to the technology field of a lighting device. Description of the Related Arts An LED (Light Emitted Diode) device is a device which converts an electrical signal to infrared rays or light using a composition semiconductor property. Unlike a florescent lamp, since the LED device does not use harmful substances such as mercury and the like, it has a low possibility to cause environmental pollution and a long life span compared to a conventional light source. Also, it is advantageous that the LED device spends low electricity compared to the conventional light source and has excellent visibility and low brilliantness due to a high color temperature. Accordingly, a current lighting device has been developed from a structure, in which a traditional light source such as a conventional incandescent lamp or a florescent lamp is used, to a structure, in which the aforesaid LED device is used as a light source. In particular, by using a light guide plate as disclosed in Korean Laid-Open Patent Publication No. 10-2012-0009209, the lighting device which performs a surface light-emitting function has been provided. The aforesaid lighting device is composed in a structure in which a flat light guide plate is disposed on a substrate, and a plurality of side view type LEDs is disposed on a side of the light guide plate in an array shape. Here, the light guide plate is a kind of plastic molding lens which functions to uniformly supply light emitted from the LEDs. Accordingly, in the conventional lighting device, the light guide plate is used as an essential component. However, due to a thickness of the light guide plate itself, there is a limitation to make the thickness of an entire product thin. Furthermore, as a material of the light guide plate is not flexible, it is disadvantageous that it would be difficult to apply the light guide plate to a part in which a bend is formed, and thus a product plan and design cannot be easily changed. Also, as the light is partially emitted to the side of the light guide plate, light loss is generated. Thus, it is problematic that light efficiency is reduced. Furthermore, as a temperature of the LEDs increases at the time of light emission, it is also problematic that the LEDs' characteristics (e.g. luminous intensity and wavelength transition) are changed. PRIOR ART REFERENCE Patent Reference Korean Laid-Open Patent Publication No. 10-2012-0009209 BRIEF SUMMARY Embodiments of the present invention have been made keeping in mind the above problems occurring in the related art. An aspect of the present invention provides a lighting device that can get thinner in thickness, improve a degree of freedom in product design and heat dissipation efficiency, and control a wavelength shift and a reduction in luminous intensity. Another aspect of embodiments of the present invention provides a lighting device which can improve brightness by minimizing light loss. Still another aspect of embodiments of the present invention provides a lighting device which can maximize the improvement of brightness without the addition of a light source by forming a reflection unit having a spacing part on a printed circuit board to improve light reflectance. Still further another aspect of embodiments of the present invention provides a lighting device which can inhibit the generation of a hot spot while improving the uniformity of light by forming an optical pattern layer having an optical pattern in the lighting device. According to an aspect of embodiments of the present invention, there is provided a lighting device, including: a light source module including at least one light source disposed on a printed circuit board, and a resin lay