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1. 发明专利

JPH07302191A MICROPROCESSOR AND DATA CONVERSION METHOD THEREOF 失效
公开(公告)号：JPH07302191A
公开(公告)日：1995-11-14
申请号：JP9321494
申请日：1994-05-02
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： KURIHARA KIYOSHI , IDO SHINICHI , URA HAJIME , OTSUKA KIKUO
IPC分类号： G06F7/548
摘要： PURPOSE:To provide the microprocessor in which shift conversion processing between data in row and column directions such as font data and image data at a high speed. CONSTITUTION:The microprocessor used for a printer processing and printing out font data or image data expressing characters and graphics is made up of a bus interface, an instruction decoder, a control section, an arithmetic section, a register and a program counter or the like. General-purpose registers 0 to 7 (51) are provided as the registers and a carry register 52 storing simultaneously the information of carry bit generated simultaneously from a most significant bit of the general-purpose register 51. When the information of the general- purpose registers 51 are subject to shift conversion processing at once by a left shift instruction and the information of the carry bit produced is stored simultaneously in the carry register 52.

2. 发明专利

JPH0876737A METHOD FOR CONVERTING CHARACTER PATTERN DATA 失效
公开(公告)号：JPH0876737A
公开(公告)日：1996-03-22
申请号：JP21015994
申请日：1994-09-02
申请人： HITACHI LTD , HITACHI MICROCOMPUTER SYST
发明人： URA HAJIME , IDO SHINICHI
IPC分类号： B41J2/485 , G06F3/12 , G06T3/00 , G09G5/24
摘要： PURPOSE: To easily convert the character pattern data of a standard style into the pattern data of an Italic style at a high speed by shifting extracted bits by shifting these bits in the row direction by as much as a prescribed quantity according to the positions of the bits, then putting the bits into a readable and reloadable memory. CONSTITUTION: The data on 8 bits in the vertical direction of the respective patterns in a character pattern ROM storing the character pattern data with column arrangement constitution are simultaneously read out and the one bit or several bits are extracted therefrom and are put into a work RAM after the bits are shifted in the row direction by as much as a prescribed quantity according to the positions of the extracted bits. More specifically, for example, the bits are put into the RAM by shifting the bits laterally by three pits as to the 1, 2 bits from above, shifting the bits by 2 bits laterally as to the 3, 4 bits from above, shifting the bits laterally by one bit as to the 5, 6 bits from above and without shifting the bits as to the 1, 2 bits from below in the case of 8 bits in the vertical direction of the pattern data.

3. 发明专利

JPH06216448A LIGHT OUTPUT CONTROL SYSTEM 失效
公开(公告)号：JPH06216448A
公开(公告)日：1994-08-05
申请号：JP2052193
申请日：1993-01-13
申请人： HITACHI LTD , HITACHI MICOM SYST KK
发明人： URA HAJIME , KURIHARA KIYOSHI
IPC分类号： B41J2/44 , H01S5/042 , H01S3/096
摘要： PURPOSE:To realize the high speed and the high performance of a laser beam printer and the like by shortening the time required for correction of a light output and stabilizing the light output obtained from a light emitting element such as laser diode to increase the printing quality thereof. CONSTITUTION:The light output characteristics SL2 vs the drive current of a light emitting element is estimated on the basis of the test value Py of a light output when the current value Ix of a drive current, the current value Px of an light output and a drive current at a point X are intentionally brought down to the test value Iy, and the target value Iz of the drive current by which the target light output Pz is obtained is calculated on the basis of the light output characteristics.

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