LIGHTING APPARATUS

• US 20180017233A1
• Filed: 07/10/2017
• Published: 01/18/2018
• Est. Priority Date: 07/12/2016
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: TAKESHITA, Hironori
• Granted Patent: US 10,151,449 B2
• Time in Patent Office: Days
• CPC Class Codes: F21S 10/00 Lighting devices or systems producing a varying lighting effect
• CPC Class Codes: F21V 11/00 Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 characterised by cooling arrangements F21V29/502
• CPC Class Codes: F21V 13/10 the elements being reflectors and screens
• CPC Class Codes: F21V 19/0015 Fastening arrangements intended to retain light sources
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 7/0016 on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
• CPC Class Codes: F21V 7/0033 with successive reflections from one reflector to the next or following
• CPC Class Codes: F21V 7/05 plane
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 47/19 via wireless transmission

Abstract

A lighting apparatus includes: a light source; a reflector plate which reflects light; and a diffuser plate which is light transmissive and is disposed to face the reflector plate. A gap between the diffuser plate and the reflector plate gradually decreases from a lower portion side of the diffuser plate and the reflector plate to an upper potion side of the diffuser plate and the reflector plate. The light source is disposed on the lower portion side to emit light toward the diffuser plate and the reflector plate.

Claims

1. A lighting apparatus, comprising:

a light source;

a reflector plate which reflects light; and

a diffuser plate which is light transmissive and is disposed to face the reflector plate,

wherein a gap between the diffuser plate and the reflector plate gradually decreases from one end side of the diffuser plate and the reflector plate to an other end side of the diffuser plate and the reflector plate, and

the light source is disposed on the one end side to emit light toward the diffuser plate and the reflector plate.

2. The lighting apparatus according to claim 1,

wherein the light source emits light of different luminescent colors.

3. The lighting apparatus according to claim 2,

wherein the light source includes a white light source which emits white light and a blue light source which emits blue light.

4. The lighting apparatus according to claim 1,

wherein the light source further includes an orange light source which emits orange light.

5. The lighting apparatus according to claim 1,

further comprising a frame body which has a plate-like shape and includes an opening portion through which light exiting through the diffuser plate passes,

wherein the frame body is disposed to cover an outer periphery of the diffuser plate in a front view of the opening portion.

6. The lighting apparatus according to claim 5,

wherein the frame body has an inner surface having a black color that suppresses reflection of light.

7. The lighting apparatus according to claim 5,

wherein the opening portion has an inner circumference surface having a black color that suppresses reflection of light.

8. The lighting apparatus according to claim 5,

further comprising a light-transmissive plate disposed to cover the opening portion of the frame body,

wherein the diffuser plate includes a surface which faces the opening portion and is covered by an antireflection film that prevents reflection of light, and

the light-transmissive plate includes a surface which faces the diffuser plate and is covered by an antireflection film that prevents reflection of light.

9. The lighting apparatus according to claim 1,

further comprising an eaves portion disposed on the other end side of the diffuser plate and the reflector plate, on a light-exit side with respect to a surface of the diffuser plate through which light exits,

wherein the eaves portion has a surface on a light source side, the surface having a black color that suppresses reflection of light.

10. The lighting apparatus according to claim 1,

wherein the reflector plate is disposed substantially parallel with an optical axis of the light source.

11. The lighting apparatus according to claim 1,

wherein the diffuser plate is flat, and is disposed at a predetermined angle to the reflector plate, and

the predetermined angle is in a range from 2 degrees or greater to 10 degrees or less.

12. The lighting apparatus according to claim 1,

wherein less than or equal to 50% of light reflected by the reflector plate is diffusely reflected.

13. The lighting apparatus according to claim 1,

wherein the reflector plate is a mirror which reflects incident light.

14. The lighting apparatus according to claim 1,

wherein the reflector plate has a wavelength-selective property of absorbing light having a wavelength in a range from 610 nm or greater to 750 nm or less, and reflecting light having a wavelength in a range from 435 nm or greater to 495 nm or less.

15. The lighting apparatus according to claim 1,

wherein the diffuser plate is a Rayleigh diffuser plate which causes Rayleigh scattering of incident light.