Interactive multi-user laser disc system

• US 4,644,515 A
• Filed: 11/20/1984
• Issued: 02/17/1987
• Est. Priority Date: 11/20/1984
• Status: Expired due to Fees

• Current Assignee: Resolution Research Incorporated
• Original Assignee: Resolution Research Incorporated
• Inventors: Allebest, Edward F., Hansen, Parley E., Maguire, Walter R., Walsh, George A.
• Primary Examiner(s): Richardson, Robert L.
• Application Number:
  US06/673,549
• Time in Patent Office: 819 Days
• Field of Search: 206/444, 206/445, 369/30, 369/32, 369/35, 369/33, 369/111, 369/34, 369/36, 369/39, 369/75.1, 369/75.2, 369/76, 360/98, 360/97, 360/110, 360/78, 360/72.1, 360/105
• US Class Current: 369/30.31
• CPC Class Codes: G11B 17/038 Centering or locking of a plurality of discs in a single cartridge
• CPC Class Codes: G11B 17/22 from random access magazine of disc records
• CPC Class Codes: G11B 23/0323 for disc-packs
• CPC Class Codes: G11B 25/043 using rotating discs
• CPC Class Codes: G11B 7/0037 with discs
• CPC Class Codes: G11B 7/08 Disposition or mounting of heads or light sources relatively to record carriers

Abstract

An interactive plural head laser disc system is characterized by pairs of head arrays installed on both sides of one or more laser discs. The heads may be accessed by either multiple or single users to independently and simultaneously access a single disc or plurality of discs. Each head array includes a plurality of read heads formed on a substrate to be in registry with the tracks of data on the discs to enable the reading of all tracks simultaneously and independently.

Claims

1. An optical disc data storage and retrieval system for reading information stored on a plurality of optical discs having a plurality of tracks on each side thereof for storing information, comprising:

an optical disc drive shaft;

means for mounting a plurality of optical discs to the disc drive shaft axially spaced apart along the length thereof, the disc drive shaft being selectively engageable with the discs such that the discs are rotatable with the disc drive shaft;

a read head array positioned proximate each side of the discs for reading information stored thereon, each read array including a plurality of read heads arranged in correspondence with the plurality of tracks; and

means for providing simultaneous access to each disc and track thereon independently of the other discs and tracks.

2. The system of claim 1 wherein the drive shaft and mounting means are mounted inside a housing having a plurality of slots therein, each slot being configured to receive a disc.

3. The system of claim 2 including support means for supporting the discs in the slots when the disc drive shaft is disengaged from the disc.

4. The system of claim 3 further including a plurality of shelves mounted inside the housing in registry with the slots for supporting the discs about peripheral portions thereof.

5. The system of claim 4 further including a plurality of stops mounted to each of the shelves such that placing the discs in the slots in abutment with each corresponding stop places the disc in alignment so that the disc drive shaft may be inserted therethrough.

6. The system of engaging claim 3 wherein the disc drive shaft includes means for selectively lifting each disc off the support means and engaging the discs for rotation with the disc drive shaft.

7. The system of claim 6 wherein the engaging means includes:

a rod inside the disc drive shaft;

a first cam mounted to the rod for each disc location;

a second cam mounted to the rod for each disc location;

lifting means actuatable by the first cam for lifting each disc off its shelf; and

stop means actuatable by the second cam for stopping motion of the discs so that each disc is retained between the lifting means and the stop means.

8. The system of claim 1 wherein each read head array includes:

a substrate; and

a multiplicity of read heads formed on the substrate to be in registry with the tracks of data on the discs.