The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1998
Filed:
Dec. 13, 1995
Applicant:
Inventor:
Masanobu Nishikata, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4429 ; 369 4425 ; 369 54 ;
Abstract
To move an object lens out of focalization on a layer and to accelerate it upwardly, a drive signal DRV is set HIGH, and a focus OPEN signal is set LOW. After a value a counter exhibits at this time is held in a register T1, the counter is reset at zero. Then a value the counter exhibits upon FZC+ being LOW is held in a register T2.sub.A, and a value the counter exhibits upon FZC- being HIGH is held in a register T2.sub.B. The value of a register T3 is calculated from T1 and the average of T2 and T2.sub.B, and when the counter value becomes equal to the sum of T1 and T3, DRV is set HIGH. After FZC- becomes LOW, OPEN is set HIGH, and the focus jump operation is completed.