Coordinate system input device providing registration calibration and a mouse function

• US 4,903,012 A
• Filed: 09/24/1987
• Issued: 02/20/1990
• Est. Priority Date: 01/20/1987
• Status: Expired due to Term

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Ohuchi, Junichi
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/101,136
• Time in Patent Office: 880 Days
• Field of Search: 340/724, 340/712, 340/365 UL, 340/709, 340/706, 340/710
• US Class Current: 345/178
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment

Abstract

A coordinate system input device provides automatic calibration between coordinates detected and display coordinates and also provides a mouse function wherein movement of an object adjacent a display screen acts to move a displayed cursor an amount proportional to the movement of the object adjacent the display screen. In its automatic calibration function, the coordinate input device compares the coordinates of a displayed test cursor with the coordinates of a detected object adjacent the display screen and calculates a correction amount to correct subsequent detected coordinate positions. In its mouse function, the coordinate input device detects movement of an object adjacent the display screen and amplifies this movement to control a cursor displayed on the display screen. When the object is removed from the display screen, the procedure to be implemented, as indicated by the position of the cursor, is automatically initiated.

Claims

1. A coordinate system input device comprising:

a display apparatus having a display screen;

a coordinate system detector disposed on a front surface of said display screen to detect a coordinate position of an object adjacent to said front surface of said display screen and to output detected coordinate system data corresponding to said position of said object;

an initial detected coordinate system memory means for storing an initial value of said detected coordinate system data obtained from said coordinate system detector;

a coordinate movement amount calculating means for calculating a movement amount of said object, as said object is being moved across said front surface, referenced to said initial value of said detected coordinate system data stored in said initial detected coordinate system memory means, said coordinate movement amount calculating means calculating said movement amount by comparing said initial value with new detected coordinate system data;

a cursor movement amount setting means for setting a movement amount of a cursor displayed on said display screen in response to an output of said coordinate movement amount calculating means;

a cursor coordinate system setting means for outputting data to said display apparatus indicating a cursor position in response to an output of said cursor movement amount setting means and said initial value stored in said initial detected coordinate system memory means; and

a cursor coordinate system memory means for storing an output of said cursor coordinate system setting means corresponding to a cursor position of said cursor displayed by said display apparatus when said object adjacent to said front surface of said display screen is removed.

2. The coordinate system input device of claim 1 wherein said cursor movement amount setting means amplifies said movement amount of said object so that a movement of said object adjacent said front surface of said display screen results in a proportional movement of said cursor displayed on said display screen.

3. A coordinate system input device of claim 2 further comprising a procedure discriminating means for producing a procedure initiating signal for automatically executing a procedure dictated by the position of said cursor when said object adjacent to said front surface of said display screen is removed.

4. A coordinate system input device comprising:

a display apparatus having a display screen;

a coordinate system detector disposed on a front surface of said display screen to detect a coordinate position of an object adjacent to said front surface of said display screen and to output detected coordinate system data corresponding to said position of said object;

an initial detected coordinate system memory means for storing an initial value of said detected coordinate system data obtained from said coordinate system detector;

a coordinate movement amount calculating means for calculating a movement amount of said object, as said object is being moved across said front surface, referenced to said initial value of said detected coordinate system data stored in said initial detected coordinate system memory means, said coordinate movement amount calculating means calculating said movement amount by comparing said initial value with new detected coordinate system data;

a cursor movement amount setting means for setting a movement amount of a cursor displayed on said display screen in response to an output of said coordinate movement amount calculating means, wherein said cursor movement amount setting means amplifies said movement amount of said object so that a movement of said object adjacent said front surface of said display screen results in a proportional movement of said cursor displayed on said display screen;

a cursor coordinate system setting means for outputting data to said display apparatus indicating a cursor position in response to an output of said cursor movement amount setting means and said initial value stored in said initial detected coordinate system memory means;

a cursor coordinate system memory means for storing an output of said cursor coordinate system setting means corresponding to a cursor position of said cursor displayed by said display apparatus when said object adjacent to said front surface of said display screen is removed;

a discriminator connected to receive said detected coordinate system data from said coordinate system detector for judging presence or absence of the detected coordinate system data and having a first output; and

a first switching element responsive to said first output of said discriminator and connected to said initial detected coordinate system memory means to allow storage of said initial value of said detected coordinate system data.

5. A coordinate system input device of claim 4 further comprising:

a procedure discriminating means for producing a procedure initiating signal for automatically executing a procedure dictated by the position of said cursor when said object adjacent to said front surface of said display screen is removed; and

a second switching element for providing an output of said cursor coordinate system memory means to said procedure discriminating means in response to said discriminator when said object or said front surface on said display screen is removed.