STRUCTURES AND PROCESSES FOR CONTROLLING ACCESS TO OPTICAL MEDIA
An optical disc is provided with an associated optical shutter. In a first state, the optical media interferes with the ability of an interrogating laser beam to read data from the optical media, and in a second state, the optical media is substantially transparent, enabling the laser beam to read the disc. A powering circuit is used to cause the optical shutter to transition from a first state to the second state. In one example, an integrated circuit acts as the powering circuit, as well as providing logic and processing functions. The integrated circuit also couples to an RF antenna, enabling the integrated circuit to communicate with an associated RF scanning device. The optical shutter may take various geometric shapes, and typically has an electrochromic material for facilitating state change. The electrochromic material may fill the shutter, or the material may form a pattern. The shutter may be positioned on the disk so that transition edge-effects are reduced, allowing for reduced interference with the laser beam when the optical shutter is in its clear state. The optical shutter does not cover the entire data area of the disc, and in one example, the optical shutter is quite small, allowing for lower cost production, as well as reducing power requirements to transition the electrochromic material. Power requirements may be further reduced by forming the electrochromic in a pattern. A small optical shutter may disable reading of disc, for example, by placing the small shutter over an important section of the disc, such as the lead-in area.
1 . An optical media comprising:
a disc having a data area;
an optical shutter in a geometric shape; and
wherein the optical shutter is on less than the full data area of the optical media.
2 . The optical media according to claim 1 , wherein the disc further comprises a lead-in area, and at least a portion of the optical shutter is positioned in the lead-in area.
3 . The optical media according to claim 1 , wherein the total area of the optical shutter is substantially less than the total area of the data area.
4 . The optical media according to claim 1 , wherein the total area of the optical shutter is less than 10% of the total area of the data area.
5 . The optical media according to claim 1 , wherein the total area of the optical shutter is less than about 1% of the total area of the data area.
6 . The optical media according to claim 1 , wherein the total area of the optical shutter is less than about 0.1% of the total area of the data area.
7 . The optical media according to claim 1 , wherein the total area of the optical shutter is less than about 50 mm 2 .
8 . The optical media according to claim 1 , wherein the total area of the optical shutter is less than about 10 mm 2 .
9 . The optical media according to claim 1 , wherein the optical shutter comprises electrochromic material.
10 . The optical media according to claim 9 , wherein the electrochromic material substantially fills the area of the optical shutter.
11 . The optical media according to claim 9 , wherein the electrochromic material fills less than the area of the optical shutter.
12 . The optical media according to claim 12 , wherein the geometric shape is selected from the group consisting of diamond, square, rectangle, circle, triangle, and irregular.
13 . An optical media comprising:
a disc having a data area;
an optical shutter in a geometric shape;
electrochromic material forming a pattern in the optical shutter; and
wherein the optical shutter is on less than the full data area of the optical media.
14 . The optical media according to claim 13 , wherein the disc further comprises a lead-in area, and at least a portion of the electrochromic material is positioned in the lead-in area.
15 . The optical media according to claim 13 , wherein the total area of the electrochromic material is substantially less than the total area of the data area.
16 . The optical media according to claim 13 , wherein the total area of the electrochromic material is less than 10% of the total area of the data area.
17 . The optical media according to claim 13 , wherein the total area of the electrochromic material is less than about 1% of the total area of the data area.
18 . The optical media according to claim 13 , wherein the total area of the electrochromic material is less than about 0.1% of the total area of the data area.
19 . The optical media according to claim 13 , wherein the total area of the electrochromic material is less than about 50 mm 2 .
20 . The optical media according to claim 13 , wherein the total area of the electrochromic material is less than about 10 mm 2 .
21 . The optical media according to claim 13 , wherein the total area of the electrochromic material is less than about 5 mm 2 .
22 . The optical media according to claim 13 , wherein the total area of the electrochromic material is less than about 2.5 mm 2 .
23 . The optical media according to claim 13 , wherein the pattern is a set of substantially parallel bars.
24 . The optical media according to claim 23 , wherein the bars are substantially perpendicular to a data track on the disc.
25 . The optical media according to claim 22 , wherein the bars form an angle greater than 90 degrees relative to a data track on the disc.
26 . The optical media according to claim 13 , wherein the pattern is irregular.
27 . The optical media according to claim 13 , wherein the geometric shape is selected from the group consisting of diamond, square, rectangle, circle, triangle, and irregular.
28 . An optical media comprising:
a disc having a data area;
a plurality of optical shutters positioned on the disc; and
wherein the aggregate area of the optical shutters is on less than the full data area of the optical media.
29 . The optical media according to claim 28 , wherein the disc further comprises a lead-in area, and at least a portion of at least one of the optical shutters is positioned in the lead-in area.
30 . The optical media according to claim 28 , wherein the aggregate area of the optical shutters is substantially less than the total area of the data area.
31 . The optical media according to claim 28 , wherein the aggregate area of the optical shutters is less than 10% of the total area of the data area.
32 . The optical media according to claim 28 , wherein the aggregate area of the optical shutters is less than about 1% of the total area of the data area.
33 . The optical media according to claim 28 , wherein the aggregate area of the optical shutters is less than about 0.1% of the total area of the data area.
34 . An optical media comprising:
a disc having a reading track;
an optical shutter on the disc;
a transition edge on the optical shutter; and
wherein transition edge forms an angle with the reading track on the optical media.
35 . The optical media according to claim 34 , wherein the optical shutter has a transition edge, and the transition edge forms a large angle with the reading track on the optical media.
36 . The optical media according to claim 34 , wherein the optical shutter has a transition edge, and the transition edge forms a small angle with the reading track on the optical media.
37 . The optical media according to claim 34 , wherein the optical shutter has a transition edge, and the transition edge forms a substantially perpendicular angle with the reading track on the optical media.
38 . The optical media according to claim 34 , wherein the optical shutter has electrochromic material arranged in a pattern, and the pattern has a transition edge, and the transition edge forms a small angle, a large angel, or a substantially perpendicular angle with an information track on the optical media.
39 . The optical media according to claim 34 , wherein the transitional edge is tapered.
40 . The optical media according to claim 34 , wherein the transitional edge is a step-wise taper.
41 . A method for interfering with the operation of an optical laser, comprising:
receiving a laser beam at an optical media;
distorting the laser beam at a transition edge to an optical shutter;
distorting the laser beam at a transition edge to electrochromic material in the optical shutter; and
distorting the laser beam with the electrochromic material.
42 . The method according to claim 41 , wherein when the electrochromic material is in its colored state, the aggregate distortion is sufficient to cause the optical media to be unusable by the optical laser.
43 . The method according to claim 41 , wherein when the electrochromic material is in its bleached state, the aggregate distortion is not sufficient to cause the optical media to be unusable by the optical laser.