Optical display device

• US 5,249,104 A
• Filed: 12/20/1991
• Issued: 09/28/1993
• Est. Priority Date: 07/03/1990
• Status: Expired due to Fees

• Current Assignee: Tatsuji Mizobe
• Original Assignee: Tatsuji Mizobe
• Inventors: Mizobe, Tatsuji
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): HEYMAN, LEONARD
• Application Number:
  US07/810,421
• Time in Patent Office: 648 Days
• Field of Search: 362/31, 362/83.3, 362/330, 362/800, 362/812, 362/806, 362/245, 362/327, 362/328, 362/23, 40/556, 40/442, 40/546, 40/547
• US Class Current: 362/605
• CPC Class Codes: G02B 6/0018 Redirecting means on the surface of the light guide
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G09F 13/04 Signs, boards or panels, illuminated from behind the insignia
• CPC Class Codes: G09F 13/0409 Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency arrangements of reflectors G09F13/14
• CPC Class Codes: G09F 13/18 Edge-illuminated signs
• CPC Class Codes: Y10S 362/80 Light emitting diode
• CPC Class Codes: Y10S 362/806 Ornamental or decorative
• CPC Class Codes: Y10S 362/812 Signs

Abstract

An optical display device such as an emblem mounted on an automotive vehicle is disclosed which is simple in structure and displays a display pattern in a silver metallic color by daylight. The interior of the device is kept invisible in the daytime, whereas the pattern is displayed in any desired color in a uniform manner in the nighttime.

Claims

1. An optical display device comprising:

a printed circuit board;

light sources mounted on said printed circuit board;

a light transmissive member having at a bottom a light reflective surface for reflecting light upwardly, cavities into which said light sources are inserted being formed in said light transmissive member, said light transmissive member being made of light transmissive material;

a light dispersing plate provided on an upper surface side of said light transmissive member for dispersing light from the light sources;

a color sheet provided on an upper surface side of said light dispersing plate;

a half mirror provided on an upper surface side of said color sheet; and

a light display member provided on an upper surface side of said half mirror for displaying a predetermined pattern.

2. An optical display device comprising:

a printed circuit board;

light sources mounted on said printed circuit board;

a light transmissive member having at an upper surface a light dispersing area and at a bottom a light reflective surface for reflecting light upwardly, cavities into which said light source are inserted being formed in said light transmissive member, said light transmissive member being made of light transmissive material;

a color sheet provided on an upper surface side of said light transmissive member;

a half mirror provided on an upper surface side of said color sheet; and

a light display member provided on an upper surface side of said half mirror for displaying a predetermined pattern.