Record medium andreproducing apparatus of the same having sidewalls wobbled in accordance with address information

Abstract

A magneto-optical record medium and a reproducing apparatus for the same allow data reproduction having good characteristics by a simple structure. The magneto-optical record medium includes a plurality of first grooves ( 3 ) each having sidewalls, at least one of which is wobbled in accordance with address information; an address mark ( 21 ) formed by changing a width of a land located between second grooves connected to the first grooves; and third grooves wobbled cyclically, formed in a data portion magnetically storing data and connected to the second grooves. The reproducing apparatus reproduces the data from the magneto-optical record medium.

1 . A record medium comprising: 
 a first groove ( 3 ,  551 ) having at least one sidewall wobbled in accordance with address information; and    a second groove ( 3 ,  555 ) connected to said first groove, having a cyclically changing form, and being provided for recording data.    
     
     
         2 . A record medium comprising: 
 a groove ( 3 ,  3 O,  3 E) having a constant width, and having sidewalls wobbled in accordance with address information.    
     
     
         3 . A record medium comprising: 
 an address identification portion ( 21 ) including a land and a first groove, at least one of said land and said first groove having a variable width; and    an address portion ( 22 ) including a second groove having sidewalls wobbled in accordance with two items of address information with respect to one data, having a constant width and connected to said first groove.    
     
     
         4 . A record medium comprising: 
 a groove ( 3 ) having sidewalls wobbled to have symmetrical forms in accordance with address information.    
     
     
         5 . A record medium comprising: 
 an address identification portion ( 21 ) including a land and a first groove, at least one of said land and said first groove having a variable width; and    an address portion ( 700 ) including a second groove having sidewalls wobbled to have symmetrical forms in accordance with two items of address information with respect to one data, and connected to said first groove.    
     
     
         6 . A record medium comprising: 
 a first groove ( 3 ) formed in a data portion storing data, having a constant width and having cyclically wobbled sidewalls.    
     
     
         7 . The record medium according to  claim 6 , further comprising: 
 a second groove ( 3 O,  3 E) having a constant width, having sidewalls wobbled in accordance with address information and connected to said first groove.    
     
     
         8 . The record medium according to  claim 6 , further comprising: 
 a second groove ( 3 ) having sidewalls wobbled to have symmetrical forms in accordance with address information, and connected to said first groove.    
     
     
         9 . A record medium comprising: 
 a first groove ( 3 ) formed in a data portion storing data, and having sidewalls wobbled symmetrically and cyclically.    
     
     
         10 . The record medium according to  claim 9 , further comprising: 
 a second groove ( 3 O,  3 E) having a constant width, having sidewalls wobbled in accordance with address information and connected to said first groove.    
     
     
         11 . The record medium according to  claim 9 , further comprising: 
 a second groove ( 3 ) having sidewalls wobbled to have symmetrical forms in accordance with address information, and connected to said first groove.    
     
     
         12 . A record medium comprising: 
 a first groove ( 3 ) formed in a data portion storing data, and having at least one of sidewalls provided with fine clock marks ( 20 ) at predetermined intervals.    
     
     
         13 . The record medium according to  claim 12 , further comprising: 
 a second groove ( 3 O,  3 E) having a constant width, having sidewalls wobbled in accordance with address information and connected to said first groove.    
     
     
         14 . The record medium according to  claim 12 , further comprising: 
 a second groove ( 3 ) having sidewalls wobbled to have symmetrical forms in accordance with address information, and connected to said first groove.    
     
     
         15 . A record medium comprising: 
 a groove ( 3 ) having at least one sidewall wobbled in accordance with address information.    
     
     
         16 . A record medium comprising: 
 an address portion including a first groove ( 551 ) having at least one sidewall wobbled in accordance with address information, and having a predetermined length; and    a data portion connected to said address portion, and having a plurality of second grooves ( 555 ) each having sidewalls not wobbled, having a predetermined length and storing data, said plurality of second grooves arranged in series at predetermined intervals.    
     
     
         17 . A record medium comprising: 
 a groove ( 3 ) formed in a data portion storing data, and having at least one sidewall wobbled cyclically.    
     
     
         18 . A reproducing apparatus for reproducing data from a record medium including an address portion storing two items of address information with respect to one data, and an address identification portion storing one item of address identification information with respect to said one data, comprising: 
 detecting means ( 113 ) for irradiating said record medium with light, and detecting reflected light coming from said record medium;    address information reproducing means ( 244 ,  53 ,  54 ,  57 ) for reproducing said address information in response to the reflected light detected by said detecting means;    address identification information reproducing means ( 100 ,  110 ) for reproducing said address identification information in response to the reflected light coming from said address identification portion and detected by said detecting means; and    selecting means ( 268 ) for selecting one of said two items of address information reproduced by said address information reproducing means in response to one item of said address identification information reproduced by said address identification information reproducing means.    
     
     
         19 . A reproducing apparatus for reproducing data from a record medium having a groove formed in a data portion storing data, and having at least one sidewall being wobbled in a predetermined cycle, comprising: 
 detecting means ( 113 ) for irradiating said record medium with light, and detecting reflected light coming from said record medium;    synchronizing signal producing means ( 117 ,  247 ) for producing a synchronizing signal having said predetermined cycle in response to change in intensity of the reflected light coming from said data portion and detected by said detecting means; and    data reproducing means ( 114 ,  118 ) for producing a reproduced signal in response to the reflected light coming from said data portion and detected by said detecting means, and reproducing said data by demodulating said reproduced signal in synchronization with said synchronizing signal.    
     
     
         20 . The reproducing apparatus according to  claim 19 , further comprising: 
 reproduced signal level detecting means ( 260 ) for detecting an intensity of the reflected light coming from said data portion and detected by said detecting means in response to said synchronizing signal; and    tracking control means ( 266 ,  267 ) for controlling tracking of said detecting means in response to a quantity of change in intensity of said reflected light detected by said reproduced signal level detecting means.