Source: http://26y.red-faced.us/patent/JP-S6278729-A
Timestamp: 2018-09-20 11:34:10
Document Index: 254625943

Matched Legal Cases: ['art 45', 'art 48', 'art 48', 'art 48', 'art 48', 'art 48', 'art 45', 'art 48']

JP-S6278729-A: Optical information storing carrier
Optical information storing carrier
Inventors: OKAZAKI YUKINORI
Publication Date: April 11, 1987
Publication Number: JP-S6278729-A
PURPOSE: To detect accurately the number of mobile tracks even in case an optical spot passes over the retrieving signal, by forming a retrieving signal part with a part having the groove width (a) equal to a guide groove part and a part having the groove width (b) and satisfying the specific relation to a track pitch P. CONSTITUTION: For a light spot guide layer 43 consisting of a guide groove part 45 having recesses and projections and a retrieving signal part 48, a track 50 through which the light spot follows is formed with the projection parts when viewed from a lens 47 which condenses the light spot. The part 48 is used as a part of the track 50 and at the same time the part 48 includes a part 48a having the groove width (a) and a part 48b of the groove width (b) against the groove width (a) of the part 45. Thus the relation 'a - P/2 = P/2 - b' is satisfied to a track pitch P. As a result, the track control signal 53 is not affected even though a light spot passes over the part 48. Thus the accurate number of mobile tracks can be detected in case the information is retrieved at a high speed by means of a groove counting method. COPYRIGHT: (C)1987,JPO&Japio
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