Image projector

• US 5,463,433 A
• Filed: 09/07/1994
• Issued: 10/31/1995
• Est. Priority Date: 09/16/1993
• Status: Expired due to Fees

• Current Assignee: Goldstar Jewellery LLC
• Original Assignee: Goldstar Jewellery LLC
• Inventors: Koo, Hee S.
• Primary Examiner(s): Will, Thomas B.
• Assistant Examiner(s): Dowling, William C.
• Application Number:
  US08/301,497
• Time in Patent Office: 419 Days
• Field of Search: 353/84, 353/30, 353/31, 359/68, 359/580, 359/589, 359/590, 359/889, 348/743, 348/742, 348/771, 348/835
• US Class Current: 353/84
• CPC Class Codes: G03B 21/16 Cooling; Preventing overheating
• CPC Class Codes: H04N 9/3114 by using a sequential colour filter producing one colour at a time

Abstract

An image projector for obtaining a full color and cooling a lamp and the LCD, including a lamp for generating parallel light, an image displaying device for displaying a video signal, a rotating shaft rotatably disposed at the projector body, a steamboat paddle wheel-shaped color filter, disposed in such a way of receiving visual rays from the lamp onto its surface, for passing through light with a selected bandwidth having a predetermined wavelength such as Red, Green, Blue as well as simultaneously substantially cooling the image displaying device by fanning action; and a projection lens for forming an image displayed onto the image displaying device and onto a screen.

Claims

1. An image projector, comprising:

a lamp for generating parallel light;

image displaying means for displaying a video signal;

a rotating shaft rotatably disposed at a projector body;

a steamboat paddle wheel-shaped color filter, disposed to receive a visual ray from the lamp, for passing through light rays with a selected color bandwidth as well as substantially cooling the image displaying means; and

a projection lens for projecting an image displayed onto the image displaying means, onto a screen.

2. The image projector of claim 1, wherein said steamboat paddle wheel-shaped color filter includes Red, Green and Blue filter portions, each of which being affixedly disposed at the circumferential surface of the rotating shaft at every 120°

, respectively, in a lengthwise direction of the rotating shaft.

3. The image projector of claim 1, wherein said steamboat paddle wheel-shaped color filter includes Red, Green and Blue filter portions, each of which being fixedly disposed at the circumferential surface of the rotating shaft at angles different from each other, respectively, in a lengthwise direction of the rotating shaft.

4. The image projector of claim 1, wherein filter portions are affixed at the circumferential surface of the rotating shaft in a twisted lengthwise direction of the rotating shaft.

5. The image projector of claim 2, wherein said Red, Green and Blue filter portions have lengths thereof equal to each other.

6. The image projector of claim 2, wherein said Red, Green and Blue filter portions have lengths thereof different from each other.

7. The image projector of claim 3, wherein said Red, Green and Blue filter portions have lengths thereof equal to each other.

8. The image projector of claim 3, wherein said Red, Green and Blue filter portions have lengths thereof different from each other.