Read-only optical memory system

• US 3,952,290 A
• Filed: 11/11/1974
• Issued: 04/20/1976
• Est. Priority Date: 11/11/1974
• Status: Expired due to Term

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Williams, Donald N.
• Primary Examiner(s): Fears, Terrell W.
• Application Number:
  US05/522,808
• Time in Patent Office: 526 Days
• Field of Search: 340/173 LM
• US Class Current: 365/127
• CPC Class Codes: G11C 13/048 using other optical storage elements

Abstract

An improved read-only optical memory system is provided comprising a mask ving a plurality of discrete increments of recorded information defined by variations in opacity and a suitable light source positioned to illuminate the mask so that the mask transmits recorded information in the form of light energy in accordance with the opacity of the illuminated discrete increments. A multiple element photo responsive charge coupled device is positioned to receive the light energy transmitted by the illuminated mask and has its elements arrayed for developing a charge at each element position commensurate with the photo energy transmitted by an optically aligned discrete increment of the mask. Accordingly, the charges of the multiple elements are representative of the recorded information defined by variations in opacity of the mask and means for transferring the charges out of the charge coupled device is provided such as appropriate control logic and/or clocking pulses producing electrical signals from the individual discrete charges of each element in the charge coupled device which are representative of the recorded information. The mask is adapted to be replaceable providing access to as much additional recorded information as may be desired.

Claims

1. A read-only optical memory system comprising:

a mask having a plurality of discrete increments of recorded information defined by variations in opacity;

a light source positioned to uniformly illuminate all said discrete increments of said mask;

a multiple element, photo-responsive charge coupled device positioned to receive the light energy transmitted through the illuminated mask and having its elements arrayed for developing a charge at each element position commensurate with the photo energy transmitted through an optically aligned discrete increment of said mask, whereby the charges of said elements are representatives of said recorded information; and

means for transferring said charges out of said charge coupled device.

2. A read-only optical memory system as claimed in claim 1 wherein the recorded information of said mask is solely defined by substantially transparent and substantially non-transparent discrete increments representative of digital data.

3. A read-only optical memory system as claimed in claim 1 wherein the recorded information of said mask is defined by continuously varying degrees of transparency representative of commensurate analog data.

4. A read-only optical memory system as claimed in claim 1 and including a fiber optic lens for transmitting photo energy from said mask to said charge coupled device.

5. A read-only optical memory system as claimed in claim 1 wherein said means for transferring charges out of said charge coupled device is operative to produce line-by-line output signals representative of said recorded information.

6. A read-only optical memory system as claimed in claim 1 wherein said means for transferring charges out of said charge coupled device is operative to provide random access to selectively transfer the charge from any desired element position within the multiple element array.

7. A read-only optical memory system as claimed in claim 1 wherein said mask is replaceable by different masks providing access to additional recorded information.

8. A read-only optical memory system as claimed in claim 1 wherein said mask is a photographic film.