Interactive plural head laser disc system

• US 4,701,896 A
• Filed: 08/20/1984
• Issued: 10/20/1987
• Est. Priority Date: 08/20/1984
• 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): MCELHENY JR, DONALD E
• Application Number:
  US06/642,505
• Time in Patent Office: 1,156 Days
• Field of Search: 369/30, 369/32, 369/35, 369/111, 369/33, 369/34, 369/36, 369/39, 369/75.1, 369/75.2, 369/76, 206/444, 206/445, 360/97, 360/98, 360/78, 360/72.1, 360/105
• US Class Current: 720/615
• CPC Class Codes: G11B 17/021 Selecting or spacing of record carriers for introducing the heads
• CPC Class Codes: G11B 17/0282 by means provided on the turntable
• CPC Class Codes: G11B 17/0287 by permanent connections, e.g. screws, rivets
• CPC Class Codes: G11B 17/26 the magazine having a cylindrical shape with vertical axis
• CPC Class Codes: G11B 19/20 Driving; Starting; Stopping; Control thereof
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 25/043 using rotating discs
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/3054 Vertical Interval Time code [VITC]
• 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 disclosed characterized by use of plural pairs of heads installed on both sides of one or more laser discs which heads may be accessed by either multi or single users to independently and/or simultaneously access a single disc or plurality of discs. The plural heads are disposed inside a housing having a plurality of slots therein, each slot being configured to receive and permit mounting of a laser disc therein.

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 for storing information, comprising:

a disc drive shaft;

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

said drive shaft and mounting means being mounted inside a housing having a plurality of slots therein, each slot being configured to receive a disc;

a plurality of read heads positioned proximate each of the discs for reading information stored thereon;

means for providing access to each disc in track thereon independently of the other disc and tracks; and

support means for supporting the disc in the slots when the disc drive shaft is disengaged from the disc;

wherein the disc drive shaft includes means for selectively lifting each disc off the support means and engaging the disc for rotation with the disc drive shaft.

2. The system of claim 1 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.