ILLUMINATING DEVICE

• US 20120069578A1
• Filed: 05/20/2010
• Published: 03/22/2012
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: Iwasaki Electric Company Limited
• Original Assignee: Iwasaki Electric Company Limited
• Inventors: Sakai, Norihiro, Iwazaki, Tomohiro, Sakuma, Kazuo, Mori, Ichirou, Kanai, Masaki, Takenaga, Maki, Ootsuka, Hiroyuki
• Granted Patent: US 8,690,394 B2
• Time in Patent Office: Days
• US Class Current: 362/296.01
• CPC Class Codes: F21S 8/006 Solar simulators, e.g. for testing photovoltaic panels
• CPC Class Codes: F21V 14/04 by movement of reflectors in vehicle head lamps F21S41/675
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes

Abstract

An illuminating device that can reduce illuminance unevenness of an irradiation target face with a simple construction is provided. In a pseudo sunlight illuminating device 1 having a lamp 22 for illuminating an irradiation target face 10A, a transmission light amount adjusting unit 60 for adjusting a transmission light amount so that the illuminance distribution on the irradiation target face 10a is made uniform is provided between the lamp 22 and the irradiation target face 10A, and the transmission light amount adjusting unit 60 is provided with a light transmission plate laminate member 64 which is constructed by stacking light transmission plates 65 which are constant in transmittance in a wavelength range of light to be transmitted and whose number corresponds to an adjustment amount of the transmission light amount so that incident light is reflected at each boundary of the front and back surfaces of each light transmission plate 65.

Claims

1. An illuminating device having a light source for illuminating an irradiation target face with light, characterized in that a transmission light amount adjusting unit for adjusting a transmission light amount so as to make an illuminance distribution on the irradiation target face uniform is provided between the light source and the irradiation target face, and the transmission light amount adjusting unit is provided with a light transmission plate laminate member having light transmission plates that are constant in transmittance in a wavelength range of light to be transmitted therethrough and stacked by a stack number corresponding to an adjustment amount of the transmission light amount so as to reflect incident light at each boundary of front and back surfaces of each of the light transmission plates.

2. The illuminating device according to claim 1, wherein each of the light transmission plates is configured to be thinner in accordance with the stack number so that the whole thickness of the light transmission plate laminate member is constant, the light transmission plate laminate member is disposed at each position where the transmission light amount is to be adjusted, a single light transmission plate configured to have the same thickness as the light transmission plate laminate member is disposed in a gap between the light transmission plate laminate members, the light transmission plate laminate members and the single light transmission plate are paved in a range through which the light to be illuminated to the irradiation target face passes, and a spacer member for preventing positional displacement of the light transmission plate laminate members and the single light transmission plate is provided around a range paved with the light transmission plate laminate members and the single light transmission plate.

3. The illuminating device according to claim 2, further comprising a press member that covers and presses the surface of each of the light transmission plate laminate members and the single light transmission plate.

7. The illuminating device according to claim 1, wherein an auxiliary reflection face for reflecting to the irradiation target face light which is a part of light emitted from the light source and travels to a location out of the irradiation target face is disposed between the light source at the side of the device and the irradiation target face.

9. The illuminating device according to claim 2, wherein an auxiliary reflection face for reflecting to the irradiation target face light which is a part of light emitted from the light source and travels to a location out of the irradiation target face is disposed between the light source at the side of the device and the irradiation target face.

10. The illuminating device according to claim 3, wherein an auxiliary reflection face for reflecting to the irradiation target face light which is a part of light emitted from the light source and travels to a location out of the irradiation target face is disposed between the light source at the side of the device and the irradiation target face.

4. An illuminating device having a light source for illuminating an irradiation target face with light, characterized in that a light diffusion unit for diffusing light so as to make an illuminance distribution on the irradiation target face uniform is provided between the light source and the irradiation target face, and two-layer light diffusion members are disposed to be spaced from each other to construct the light diffusion unit.

5. The illuminating device according to claim 4, wherein a plurality of reflection plates are arranged in parallel at the opposite side to the irradiation target face with respect to the light source to constitute a reflection face, direct light emitted directly from the light source and reflection light reflected from the reflection face are applied to the irradiation target face, and the two-layer light diffusion members are disposed to be spaced from each other at such a distance that boundaries of the plurality of reflection plates are inconspicuous.

6. The illuminating device according to claim 4, wherein the light diffusion member at the light source side out of the two-layer light diffusion members is provided with an illuminance adjusting plate for adjusting local illuminance unevenness.

8. The illuminating device according to claim 5, wherein the light diffusion member at the light source side out of the two-layer light diffusion members is provided with an illuminance adjusting plate for adjusting local illuminance unevenness.

11. The illuminating device according to claim 4, wherein an auxiliary reflection face for reflecting to the irradiation target face light which is a part of light emitted from the light source and travels to a location out of the irradiation target face is disposed between the light source at the side of the device and the irradiation target face.

12. The illuminating device according to claim 5, wherein an auxiliary reflection face for reflecting to the irradiation target face light which is a part of light emitted from the light source and travels to a location out of the irradiation target face is disposed between the light source at the side of the device and the irradiation target face.

13. The illuminating device according to claim 6, wherein an auxiliary reflection face for reflecting to the irradiation target face light which is a part of light emitted from the light source and travels to a location out of the irradiation target face is disposed between the light source at the side of the device and the irradiation target face.