JPH05159365A - Optical disk and light / heat irradiation device - Google Patents

Abstract

(57) [Summary] [Structure] On the reading surface 2 of the recording symbol, there is provided a blocking layer 3 made of a substance which is decomposed by light and / or heat to prevent the recording / reproducing light beam from entering the signal recording surface. An optical disc 1 provided. A light / heat irradiation device comprising a light (heat) irradiation unit including an ultraviolet lamp, a heat source, and the like, which emits light and / or heat that decomposes a substance forming the blocking layer of the optical disc. [Effect] There is provided a small-sized optical disc capable of preventing shoplifting, and a light / heat irradiation device which is used together with the optical disc and puts the optical disc into a usable state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk and a light / heat irradiation device.

[0002]

2. Description of the Related Art Generally, optical discs on the market tend to be miniaturized and are miniaturized so that they can be easily put in a pocket and carried. When this product is placed in a store as a product, there is a problem in sales management that it is easy to be shoplifted due to its small size, and it is a serious problem particularly in large stores. Therefore, conventionally, there is a package in which a small optical disk is placed one by one on a cardboard having a size that does not fit in a pocket, and a transparent cover formed by molding a vacuum sheet to cover them is covered. It is a general product form.

[0003]

However, in the conventional method, although the optical disc itself is small, the product form at the time of sale is bulky, and the occupied volume at the store front, warehouse, transportation, etc. is the same as that of the optical disc itself. Multiples, which increases sales, inventory and transportation costs. Therefore, a technique for preventing shoplifting without making the product form at the time of sale bulky is desired.

An object of the present invention is to provide an optical disc which is compact and which can prevent shoplifting.

Another object of the present invention is to provide a light / heat irradiation device which is small in size and is used together with an optical disc capable of preventing shoplifting and makes the optical disc usable. .

[0006]

According to the present invention, one of the above-mentioned objects is to provide light and / or light on a reading surface of a recording signal.
Alternatively, it is achieved by providing an optical disc comprising a blocking layer that is made of a substance that decomposes by heat and that prevents a recording / reproducing light beam from entering the signal recording surface.

Another object of the above is to emit light and / or heat for decomposing the substance constituting the blocking layer of the optical disc to the reading surface of the recording signal of the optical disc. -Achieved by providing a heat irradiation device.

In the present invention, the "substance decomposable by light and / or heat" means that the substance is recorded / removed by being evaporated and removed by the action of light and / or heat.
The reproduction light beam can pass therethrough. Examples of such substances include diazo pigments, red meat, and carbon powder. Further, the recording / reproducing light beam means a light beam used for at least one of recording and reproduction.

[0009]

[Operation] An optical disk uses a light beam such as a laser,
The recorded signal is read and a new signal is written. In principle, if the light beam does not normally reach the signal recording surface, the function as an optical disk cannot be exhibited. Therefore, if a substance that prevents the light beam from normally reaching the signal recording surface is present on the optical path, the function of the optical disc cannot be exerted and the optical disc cannot be used at all.

The substance constituting the blocking layer in the optical disk of the present invention has a property of preventing the light beam from reaching the signal recording surface normally by absorbing the light beam, reflecting it, or bending its optical path. Have. When the optical discs are lined up in the store, this substance exists on the reading surface of the optical disc, and the function as the optical disc cannot be exhibited as it is. Therefore, even if this optical disk is shoplifted, it cannot be used, so that the motivation for shoplifting is lost and shoplifting is prevented.

Since the above substances are decomposed by light and / or heat, at the store, a device for radiating light and / or heat is placed on such an optical disc, and the customer pays for the merchandise. When brought to a place, such a device can be used to lose the property of blocking the light beam of the substance, and the function of the optical disk can be produced. Therefore, only the paying customer can receive the normally functioning optical disk.

[0012]

EXAMPLES The present invention will be specifically described below with reference to examples.

Embodiment 1 FIG. 1 shows a schematic perspective view of an example of an optical disk of the present invention.
On the recording signal reading surface 2 (on the substrate surface) of the compact disc 1 shown in FIG. 1, with a black oil-based pen, five black stripes 3 (blocking layer) concentric with the rotation axis of the disc as a center are formed. It is drawn. The black streaks partially cover the innermost part to the outermost part of the signal recording area. When such a compact disc was put on a player, the reproducing light beam was blocked by the blocking layer, and the compact disc could not be played back.

Embodiment 2 FIG. 2 shows a schematic block diagram of a light / heat irradiation apparatus of the present invention. The light / heat irradiation device shown in FIG. 2 includes a light (heat) irradiation unit 4 including an ultraviolet lamp for light emission, a heat source for heat emission, a pulse laser, a continuous laser, and a rotation drive unit for rotating an optical disk 5. 6, a timer 7 for operating the light (heat) irradiation unit 4 and the rotation drive unit 6 is provided.

The compact disc of Example 1 was mounted on such a light / heat irradiation apparatus, and while the compact disc was rotated at a speed of 60 revolutions per minute, a YAG pulse laser beam having a diameter of about 1 mm was applied onto the substrate surface. The black streaks were irradiated and the black streaks were removed by the energy of the laser. When I loaded this compact disc into a player, I was able to play it.

[0016]

According to the present invention, there is provided an optical disc which is small in size and capable of preventing shoplifting, and a light / heat irradiation device which is used with such an optical disc and makes the optical disc usable.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an example of an optical disc of the present invention.

FIG. 2 is a schematic block diagram of a light / heat irradiation device of the present invention.

[Explanation of symbols]

 1 Optical disc 2 Reading surface 3 Blocking layer 4 Light (heat) irradiation part 5 Optical disc

Claims (2)

[Claims] 1. Light and / or light on a reading surface of a recording signal.
An optical disc comprising a blocking layer that is made of a substance that decomposes by heat and that prevents a recording / reproducing light beam from entering the signal recording surface. 2. A light / heat irradiation device, characterized in that light and / or heat for decomposing the substance forming the barrier layer of the optical disk according to claim 1 is radiated to the reading surface of the recording signal of the optical disk.