JPS6190022U

JPS6190022U -

Info

Publication number: JPS6190022U
Application number: JP17530084U
Authority: JP
Priority date: 1984-11-19
Filing date: 1984-11-19
Publication date: 1986-06-11

Description

[Brief explanation of drawings]

第１図は本考案のデイスクの部分平面図、第２
図はその受光素子の受光状態を模式的に表わす平
面図、第３図ａはピツトに光が照射された場合に
おける反射光の状態を表わす部分断面図、第３図
ｂはそのエネルギー分布の特性図、第３図ｃはそ
の受光素子の受光状態を模式的に表わす平面図、
第４図は３値論理判別のためのデコーダのブロツ
ク図、第５図ａはデイスクの模式的平面図、第５
図ｂはその断面図、第５図ｃはその部分拡大断面
図、第６図は従来のデイスクの部分平面図、第７
図ａはそのピツトが無い所に光が照射された場合
における反射光の状態を表わす部分断面図、第７
図ｂはそのエネルギー分布の特性図、第７図ｃは
その受光素子の受光状態を模式的に表わす平面図
、第８図ａはそのピツトが有る所に光が照射され
た場合における反射光の状態を表わす部分断面図
、第８図ｂはそのエネルギー分布の特性図、第８
図ｃはその受光素子の受光状態を模式的に表わす
平面図である。１…デイスク、２…孔、３…基板、４…反射膜
、５…保護膜、６…レーベル、７，１１…ピツト
、８…スポツト、９…受光素子、１２…デコーダ
。 Figure 1 is a partial plan view of the disk of the present invention;
The figure is a plan view schematically showing the light-receiving state of the light-receiving element, Fig. 3a is a partial cross-sectional view showing the state of reflected light when the pit is irradiated with light, and Fig. 3b is the characteristic of its energy distribution. Figure 3c is a plan view schematically showing the light receiving state of the light receiving element,
FIG. 4 is a block diagram of a decoder for three-value logic discrimination, FIG. 5a is a schematic plan view of a disk, and FIG.
Figure b is a sectional view thereof, Figure 5 c is a partially enlarged sectional view, Figure 6 is a partial plan view of a conventional disk, and Figure 7 is a partial plan view of a conventional disk.
Figure a is a partial cross-sectional view showing the state of reflected light when light is irradiated to a place where there is no pit.
Figure b is a characteristic diagram of the energy distribution, Figure 7c is a plan view schematically showing the light receiving state of the light receiving element, and Figure 8a is the reflected light when the pit is irradiated with light. Fig. 8b is a partial cross-sectional view showing the state, and Fig. 8b is a characteristic diagram of its energy distribution.
FIG. c is a plan view schematically showing the light receiving state of the light receiving element. DESCRIPTION OF SYMBOLS 1... Disk, 2... Hole, 3... Substrate, 4... Reflective film, 5... Protective film, 6... Label, 7, 11... Pit, 8... Spot, 9... Light receiving element, 12... Decoder.

Claims

[Scope of utility model registration request]

In a disk in which information is recorded by changing the length or interval of the pits in accordance with the recorded information, the pits include a first pit and a second pit,
The first pit is formed by a recess or protrusion having a first width, and the second pit is formed by two recesses or protrusions having a second width narrower than the first width arranged in a radial direction. The state in which the first and second pits are not formed, the state in which the first pits are formed, and the state in which the second pits are formed are respectively
A disk characterized in that the information is recorded in correspondence with one logical value.