Optical display device

• US 3,885,096 A
• Filed: 07/13/1973
• Issued: 05/20/1975
• Est. Priority Date: 07/15/1972
• Status: Expired due to Term

• Current Assignee: Masafumi Inuiya
• Original Assignee: Masafumi Inuiya
• Inventors: Inuiya, Masafumi
• Primary Examiner(s): Robinson, Thomas A.
• Application Number:
  US05/378,861
• Time in Patent Office: 676 Days
• Field of Search: 178/15,18,19,20,30 340/324A,324AD,146.3SY 346/139C
• US Class Current: 178/15
• CPC Class Codes: G06F 3/033 Pointing devices displaced or positioned by the user , e.g. mice, trackballs, pens or joysticks; Accessories therefor digitisers characterised by the transducing means G06F3/041

Abstract

An optical display device comprising a screen for optically displaying an image record, means for making a light spot impinge on the screen at a desired position on the image record, means for photoelectrically detecting the position of the light spot to produce a control signal corresponding to the position, and an information retrieval device in which information stored therein is outputted under the control of the control signal.

Claims

1. An optical display device comprising a screen for optically displaying an image record, means for making a light spot impinge on the screen at a desired position on said image record, means for photoelectrically converting said position of the light spot into an electric control signal which is fed to a computer, and an information retrieval device in which a new image recorded on a film corresponding to said position is projected on the screen under the control of an output signal from the computer.

2. An optical display device as defined in claim 1, wherein said screen is a transmission type projection screen.

3. An optical display device as defined in clAim 2, wherein said means for making a light spot impinge on the screen is a light-emitting pen.

4. An optical display device as defined in claim 3, wherein said light-emitting pen is energized to emit light when the head thereof is pressed against the surface of the screen.

5. An optical display device as defined in claim 2, wherein said light spot impinges on the front surface of the screen, and wherein said converting means is located at the backside of the screen so as to receive light transmitted through the screen.

6. An optical display device as defined in claim 1 wherein said converting means comprises photoelectric means for converting said position of the light spot into said control signal, and coordinate detecting circuit means connected to said photoelectric means for converting said control signal into a coordinate signal representing the coordinates of said new image stored on a microfilm and corresponding to said desired position.

7. An optical display device as defined in claim 6, wherein said coordinate detecting circuit means includes a high-pass filter and a clipping circuit.

8. An optical display device as defined in claim 2 wherein both said image record and said new image are projected onto the backside of said screen, whereas said light spot impinges on the front side of said screen.

9. An optical display device as defined in claim 5, wherein said converting means comprises a television camera with a monitor located within the device to view the entire area of the screen from the backside thereof.

10. An optical display device as defined in claim 1, further comprising means for projecting an image on the screen through an optical system.

11. An optical display device as defined in claim 1, wherein said projecting means is a projection lens system for directly focussing an image on the screen from a microfilm.

12. An optical display device as defined in claim 1, wherein said projecting means is a projection lens system for focussing an image on the screen from a display cathode ray tube.