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Patent Searching and Data


Title:
INFORMATION RECORDING AND REPRODUCING DEVICE
Document Type and Number:
Japanese Patent JPH0737250
Kind Code:
A
Abstract:

PURPOSE: To lower a timing jitter of a reproducing pulse of a leading edge part of a recording mark and to secure a reproducing phase margin by making energy of a leading part of a recording light pulse larger than its following part by using a recording pulse generating circuit.

CONSTITUTION: In the recording marks 304 and 305 recorded by using a recording pulse 215, the energy of the leading part of the recording light pulse is made larger than its following part in a recording process, and a part without remaining heat is formed by lower heat energy. Consequently, the recording mark is not formed into a teardrop shape by the conventional information recording and reproducing device, but is formed in an approximately symmetrical shape as to the leading edge and trailing edge. Consequently, a regenerative signal 302 is also made to be approximately symmetrical as to inclination of the leading and trailing edges, and a timing jitter at a leading edge of the regenerative signal can be suppressed as low as its trailing edge, and hence the required reproducing pulse 303 is obtained. Thus, influence upon the following recording marks is diminished, and the position of the leading edge of the recording pulse 115 is variablly controllable, and even when the recording density is increased, an edge-shift phenomenon due to thermal interference can be canceled.


Inventors:
HIKASA MASAFUMI
Application Number:
JP18297093A
Publication Date:
February 07, 1995
Filing Date:
July 23, 1993
Export Citation:
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Assignee:
NEC CORP
International Classes:
G11B7/00; G11B7/0045; G11B7/005; G11B7/007; G11B7/125; G11B7/126; G11B11/105; G11B20/10; (IPC1-7): G11B7/00; G11B7/007
Attorney, Agent or Firm:
Yosuke Goto (2 outside)