CN2380994Y - Small digital laser video-disc - Google Patents

Abstract

The utility model relates to a small digital laser videodisc, which comprises a circular transparent plastic thin sheet. The videodisc is provided with a center hole for positioning, one surface of the plastic thin sheet is the data reading surface, and the other surface is the signal surface. Spiral tracks which are composed of many discontinuous concave pits and represent signals are molded by injection and a metal laser reflecting layer is electroplated on the signal surface from the center to the outer edge. A protective film is coated on the laser reflecting layer, and information on the signal surface uses laser reflection principle and is reproduced from the upper side of the reading surface by decoding. The width of the concave pits is 0.39-0.5 nm, the spacing of tracks is 0.9-1.35 nm, and the rotation speed of a videodisc driving motor or the signal scanning speed is 0.9-1.2 nm/ sec.

Description

Small-sized Video CD

The utility model relates to a kind of small-sized Video CD (DVCD).

By many helical trajectories of forming by small discontinuous pit, there is not the part of pit to be called platform on the optic disk surface on traditional miniature laser optic disk (VCD) surface.The helical trajectory record data that VCD utilizes these pits to form.As described in Figure 3, the width of the pit of VCD is 0.5nm, and the centre distance between the track is 1.6nm., because the cause of dimple size and orbit interval is restricted the memory space of traditional VCD.Just introduced this VCD in the VCD technical manual the 2nd edition (Video CD Specification, Version 2.0) that flies to publish in power Pu consumer electronics company April nineteen ninety-five.

The utility model is developed in order to address the above problem.

The purpose of this utility model provides the bigger small-sized data videodisc of a kind of memory space (DVCD (digital video compact disk)).

Small-sized Video CD of the present utility model; the transparent plastic sheet that comprises a circle; described optic disk has a center pit in order to the location; the one side of this plastic tab is the data read face; another side then is a signal face; on the described signal face from its center to the outer rim injection moulding helical trajectory of the representation signal formed by many discontinuous pits; covered the laser-bounce layer that the layer of metal material is formed with electro-plating method on the described signal face; applied layer protecting film on the described laser-bounce layer; be stored in the information on the described signal face; utilize the principle and the characteristic of laser-bounce; and through decoding; after reading, reset described reading face; it is characterized in that: the width of described pit is 0.39-0.5nm; orbit interval between the described track is 0.9-1.35nm, and the rotating speed of described optic disk drive motor or signal scanning speed are 0.9-1.2nm/ second.Table 1 is hereinafter contrasted to DVCD of the present utility model and traditional VCD.Difference between table 1:VCD and the DVCD

	VCD	DVCD
			Diameter	120nm	120nm
Thickness	1.2mm	1.2mm
			Orbit interval	1.6nm	0.9-1.35nm
The pit minimum length	0.834nm	0.834nm
			Pit width	0.5nm	0.35-0.5nm
Sweep velocity	1.21-1.41nm/ second	0.9-1.2nm/ second
			Optical maser wavelength	780nm	780nm
Memory data output (every layer)	0.68 GB	0.69-1.28 GB

Because small-sized Video CD of the present utility model has narrower pit width and less orbit interval, thereby its memory space greatly improves.

Consult accompanying drawing below and describe most preferred embodiment of the present utility model.

Fig. 1 is the synoptic diagram of DVCD of the present utility model and pit and platform;

Fig. 2 is the spacing of track of explanation DVCD of the present utility model and the synoptic diagram of dimple size;

Fig. 3 is the synoptic diagram of the relation of the spacing of track of the traditional VCD of illustration and platform and dimple size.

DVCD of the present utility model is a kind of optic disk distribution medium that designs for storage digital video disk signal, and it is 74.1 minutes to 120 minutes vision signal of storage on the card of 120mm (4.75 inches) at diameter.The quality of the video and audio signal that this medium provided is based on the MPEG-1 of the digital audio and video signals with two-way CD Quality (animation expert group) digital video signal.

DVCD of the present utility model appears to have point image VCD, and it comprises the transparent plastic sheet of a circle.The one side of thin slice is the data read face, and the another side of thin slice forms the helical trajectory (signal face hereinafter referred to as) of the representation signal that many small discontinuous pits form when injection moulding.On the signal face of transparent sheet, covered layer of metal laser-bounce layer with electric plating method.The metal material of forming the reflection horizon can be aluminium, silver, gold or copper.And then on the reflection horizon, apply layer protecting film, with protection metal laser-bounce layer, prolong its serviceable life.As shown in Figure 1, diameter is that the card center of 120mm (4.75 inches) has a center pit.There is not the flat surface of pit partly to be called platform on the card.Platform represents that with alphabetical X pit is then represented with alphabetical Y.The helical trajectory that utilizes these pits to form is recorded in data on the DVCD.Information on the signal face of the optic disk of storage is utilized the principle and the characteristic of laser-bounce, and through decoding, is reset after the reading face of DVCD is read.It is to be noted that be injection-moulded in the pit Y on the signal face on the DVCD, the physical form on reading face is just as the floating-point of opposite projection.

With reference to Fig. 1, DVCD1 adopts the strip pit Y that is engraved in spirally on the card.Binary one is represented at the edge at vertical two ends of pit, and the remainder of pit Y is then represented binary zero.Information is recorded on the card to the outside spirally as the inboard of hairspring from panel surface.Distance between the helical trajectory is called " orbit interval ".

Consider traditional lower defective of VCD memory space, as shown in Figure 2, designer of the present utility model has developed the narrower and littler DVCD of orbit interval of a kind of pit Y width, to increase its memory space.As shown in Figure 2, the width of the pit Y of DVCD of the present utility model is 0.35-0.5nm, and orbit interval then is 0.9-1.35nm.The utility model makes DVCD reach bigger capacity by the helical trajectory of littler pit and Geng Mi.In reading the process of information, the rotating speed of disk-drive motor is also lower, and its rotating speed or signal scanning speed only are 0.9-1.2nm/ second.

Although above described most preferred embodiment of the present utility model, yet for a person skilled in the art, under the prerequisite that does not break away from spirit of the present utility model, can make various variations and remodeling to the utility model.Protection domain of the present utility model is limited by appending claims.

Claims (2)

1. small-sized Video CD; the transparent plastic sheet that comprises a circle; described optic disk has a center pit in order to the location; the one side of this plastic tab is the data read face; another side then is a signal face; on the described signal face from its center to the outer rim injection moulding helical trajectory of the representation signal formed by many discontinuous pits; covered the laser-bounce layer that the layer of metal material is formed with electro-plating method on the described signal face; applied layer protecting film on the described laser-bounce layer; be stored in the information on the described signal face; utilize the principle and the characteristic of laser-bounce; and through decoding; after reading, reset described reading face; it is characterized in that: the width of described pit is 0.39-0.5nm; orbit interval between the described track is 0.9-1.35nm, and the rotating speed of described optic disk drive motor or signal scanning speed are 0.9-1.2nm/ second.

2. according to the small-sized Video CD of claim 1, it is characterized in that: the metal material of forming described laser-bounce layer is aluminium, silver, gold or copper.

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