Display board

• US 5,247,429 A
• Filed: 11/21/1991
• Issued: 09/21/1993
• Est. Priority Date: 11/21/1990
• Status: Expired due to Term

• Current Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Imai, Takashi, Iwase, Teruhiko, Koura, Toshio
• Primary Examiner(s): Cole, Richard R.
• Application Number:
  US07/795,772
• Time in Patent Office: 670 Days
• Field of Search: 362/26, 362/27, 362/29, 362/30, 362/31, 362/351
• US Class Current: 362/29
• CPC Class Codes: F21W 2111/00 Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: G09F 13/00 Illuminated signs; Luminous advertising G09F9/00, G09F11/00 take precedence; control of displays in general using static means to present variable information G09G

Abstract

A display board has a light transmitting substrate illuminated by a light source at the back side, a illuminance adjusting layer having a plurality of light reflective dots and formed on the surface at the front side of the substrate, and a colored light transmitting image layer formed on the illuminance adjusting layer. This display board is manufactured by forming a illuminance adjusting layer and image layer sequentially on the same side of the substrate.

Claims

1. A display board that is illuminated by a light source, comprising:

a light transmitting substrate having a front side, and an opposite back side, and adapted to be illuminated by a light source at the back side;

an illuminance adjusting layer having a plurality of dots which have a color which is light reflective, and attached to a surface at the front side of said substrate; and

a colored light transmitting image layer formed over said illuminance adjusting layer, wherein the number of said dots within one inch is more than or equal to 100.

2. A display board according to claim 1, wherein said dots have diameters which vary such that said dot diameter becomes greater as they approach a position of said light source.

3. A display board according to claim 1, wherein said dots are colored photopolymerized resin layer.

4. A display board that is illuminated by a light source, comprising:

a light transmitting substrate having a front side, and an opposite back side, and adapted to be illuminated by a light source at the back side;

an illuminance adjusting layer having a plurality of light reflective colored dots, and attached to a surface at the front side of said substrate;

a white layer formed on said dots, and covering a whole surface at the front side of said substrate; and

a black layer selectively formed in a configuration of figures to be displaced, formed over said white layer, wherein the number of said dots within one inch is more than or equal to 100.

5. A display according to claim 4, wherein said dots have diameters which vary such that said dot diameter becomes greater as they approach a position of light source.

6. A method of making a display board that is illuminated by a light source comprising:

a preparing step for preparing a light transmitting substrate;

an illuminance adjusting layer forming step for attaching a plurality of dots of a light reflective color to a surface at a front side of said light transmitting substrate, wherein a number of dots per inch is at least 100; and

an image layer forming step for forming a colored light transmitting image layer on the surface at the front side of said light transmitting substrate so that said illuminance adjusting layer is covered with the colored light transmitting image layer.