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Polarized Plate, Surface Light Source Device And Lighting Switch

A technology of polarizing plates and surface light sources, which is applied to electric switches, lighting devices, and optical elements used to change the spectral characteristics of emitted light, etc. issues such as rising costs

Active Publication Date: 2014-12-31
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the resin sheet A described in Patent Document 2, when the ratio p / h becomes 2.5 or more, the uniformity of luminance cannot be sufficiently improved, and luminance unevenness cannot be eliminated.
[0013] Therefore, in the surface light source device of Patent Document 2, in order to obtain the uniformity of luminance distribution, it is necessary to use a special resin sheet B (that is, a resin sheet with a difference in the degree of diffusion in at least one orthogonal direction of 7° or more). Diffuse light, and there is a problem that the cost of the surface light source device continues to rise.

Method used

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  • Polarized Plate, Surface Light Source Device And Lighting Switch
  • Polarized Plate, Surface Light Source Device And Lighting Switch
  • Polarized Plate, Surface Light Source Device And Lighting Switch

Examples

Experimental program
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Embodiment approach 1

[0070] (Structure of Embodiment 1)

[0071] Below, refer to Figure 5 ~ Figure 8 The light switch according to Embodiment 1 of the present invention will be described. Figure 5 It is an overall perspective view of the light switch 21 according to Embodiment 1 of the present invention. Figure 6 is an exploded perspective view of the light switch 21 . in addition, Figure 7 It is a plan view of the surface light source device 41 housed in the light switch 21 . Figure 8 (A) and Figure 8 (B) is a plan view and a front view showing the surface light source device 41a of one unit. Figure 8 (C) is Figure 8 (A) A-A line profile

[0072] Such as Figure 5 and Figure 6 As shown, in the light switch 21, a polarizing plate 24 is disposed above a bracket 23 with a built-in light source 22, and a diffusion plate 25 is stacked thereon, and furthermore, a color plate 26 and a button 30 are disposed thereon. In addition, the front-back direction of the light switch 21 is the d...

Embodiment approach 2

[0099] Figure 17 (A) and Figure 17(B) is a plan view and a front view showing the surface light source device 51a according to Embodiment 2 of the present invention. In this embodiment, the optical pattern 31 is formed on the surface of the polarizing plate 24 facing the light source side. In this case, the apex angle of the prism-shaped optical pattern 31 is preferably about 60°. Regarding the other points, they are the same as those in Embodiment 1, so the description of the same components will be omitted by attaching the same symbols.

[0100] In the case where the surface on which the optical pattern 31 is formed faces the light source side, as Figure 18 As shown, part of the light Rz4 emitted forward from the light source 22 is refracted by the lower optical pattern 31 and then reflected by the upper surface of the polarizing plate 24 . Therefore, the amount of light emitted forward from the center of the surface light source device 51a decreases, and the uniformi...

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PUM

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Abstract

The present invention provides a polarized plate, a surface light source device and a lighting switch which can restrain the reduction in the overall brightness and enable the brightness distribution to be more uniform when being configured in front of a light source. The polarized plate (24) forms an optical pattern (31) used for reflecting or refracting the light on the surface of a substrate (42). By observing from the direction vertical with the substrate (42), the range of a point (O) through which a main shaft (N) containing the light source penetrates is divided into at least three areas (44) by at least three boundary lines which extend radially by taking the point (O) as the center. In each area, the optical pattern (31) at least formed nearby the point extends along the direction parallel with the direction of clamping the middles of the two boundary lines (43) of the area, for example, extends along the direction of the bisector of the boundary lines (43).

Description

technical field [0001] The invention relates to a polarizing plate, a surface light source device and a light switch. Specifically, it relates to a polarizing plate for uniformizing the luminance distribution of transmitted light by transmitting light emitted from a light source arranged behind. In addition, it relates to a surface light source device and a light switch using the polarizing plate. Background technique [0002] In the light switch, the switch mechanism part and the light source for opening and closing a pair of switch contacts are installed in the housing, and there is a button on the front. Then, by operating the button, the switch mechanism is operated to open or close the switch contacts, and to turn on or off the light source. In this type of light switch, in order to make the brightness distribution of the light-emitting part (surface light source device) uniform, a diffusion plate is arranged between the light source and the button. In addition, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30F21V9/14H01H9/16
Inventor 奥田满田上靖宏篠原正幸
Owner ORMON CORP