Cathode ray tube optical filter device with cursor pointing function

• US 5,329,291 A
• Filed: 08/18/1993
• Issued: 07/12/1994
• Est. Priority Date: 08/18/1993
• Status: Expired due to Fees

• Current Assignee: Yibing Liang
• Original Assignee: Yibing Liang
• Inventors: Chen, Ming-Der
• Primary Examiner(s): Coles, Sr., Edward L.
• Assistant Examiner(s): Grant, II, Jerome
• Application Number:
  US08/107,642
• Time in Patent Office: 328 Days
• Field of Search: 345/180, 345/181, 345/182, 345/173, 345/172, 345/174, 345/175, 345/176, 345/157, 358/453, 358/245, 358/247, 358/250, 358/253
• US Class Current: 345/157
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A crt optical filter device includes a transparent plastic sheet and a transparent glass panel, each of which is provided with a transparent conductive circuit layer and a pair of conductors. The outer surface of the glass panel is disposed adjacent to the inner surface of the transparent plastic sheet, while the inner surface thereof is to be disposed adjacent to a screen of a computer monitor. A plurality of spacers, which are made of an insulative material, normally space apart the conductive circuit layers of the transparent plastic sheet and the glass panel. An interface card is connected electrically to the conductors and is to be connected electrically to a computer. The interface card receives analog X and Y signals that correspond to a selected part of the transparent plastic sheet from the conductors when the conductive circuit layers are brought into electrical contact due to application of pressure on the selected part of the transparent plastic sheet. The interface card processes the analog X and Y signals into corresponding digital signals for controlling the computer to move a cursor on the screen of the computer monitor so as to coincide with the selected part of the transparent plastic sheet and for controlling the computer to accomplish predetermined functions.

Claims

1. A crt optical filter device to be installed on a computer monitor of a computer and capable of controlling movement of a cursor on a screen of the computer monitor, said crt optical filter device comprising:

a first transparent plastic sheet having an inner surface formed with a transparent first conductive circuit layer and a pair of first conductors;

a transparent glass panel having an outer surface disposed adjacent to said inner surface of said first transparent plastic sheet and an inner surface to be disposed adjacent to the screen of the computer monitor, said outer surface of said glass panel being provided with a transparent second conductive circuit layer, a pair of second conductors, and a grounded static conductor;

one of said inner surface of said first transparent plastic sheet and said outer surface of said glass panel being further provided with a plurality of spacers which are made of an insulative material and which space apart said first and second conductive circuit layers; and

an interface card connected electrically to said first and second conductors and to be connected electrically to the computer, said interface card receiving analog X and Y signals that correspond to a selected part of said first transparent plastic sheet from said first and second conductors when a portion of said first conductive circuit layer contacts and connects electrically with a portion of said second conductive circuit layer due to application of pressure on said selected part of said first transparent plastic sheet, said interface card processing said analog X and Y signals into corresponding digital signals for controlling the computer to move the cursor on the screen of the computer monitor so as to coincide with said selected part of said first transparent plastic sheet and for controlling the computer to accomplish predetermined functions.

2. The crt optical filter device as claimed in claim 1, wherein said inner surface of said glass panel is provided with a transparent optical filter film.

3. The crt optical filter device as claimed in claim 1, wherein said outer surface of said glass panel has a second transparent plastic sheet secured thereon, said second conductive circuit layer, said second conductors, and said static conductor being formed on said second transparent sheet.