公开(公告)号：JPH05189590A

公开(公告)日：1993-07-30

申请号：JP16327692

申请日：1992-06-23

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： EDOWAADO BAAKAN ,  DEIBUITSUDO PII GOOREN ,  JIYOSEFU KATSUTSU ,  YAAYUN RII ,  JIEROOMU SUUOOTSU ,  TOOMASU MATSUZU

IPC: G06K7/015 ,  G06K7/10 ,  G06K7/14

Abstract: PURPOSE: To easily read bar codes having various densities by operation angles in a wide range. CONSTITUTION: Light emitting elements 61 and 62, a photodetection element 63, and a related circuit network are so arranged that two data channels are obtained from a scanned bar code. Two channels have different resolutions. Data of two channels are analyzed to obtain one decoded result. Though the operation angle and the density of the bar code are changed, at least one of two channels having different resolutions must be suitable for detection of the whole or most of bar code data. Data of the channel which generates the correct result can be used as it is. Even if two channels don't generate correct results by themselves, data of each channel is analyzed, and correct parts of their data are combined to generate one correct decoded result.

公开(公告)号：JPH07254041A

公开(公告)日：1995-10-03

申请号：JP28370094

申请日：1994-11-17

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： RAJI BURITSUJIRARU ,  JIYOSEFU KATSUTSU ,  DEIBUITSUDO PII GOOREN ,  POORU DOBUOOKISU ,  YAAIYUN RII

IPC: G06K7/10

Abstract: PURPOSE: To provide a scanning module which can be improved in sighting and emitting abilities, scanning pattern visibility, and shock resistance, can be constituted in a compact state, and reduced in the cost. CONSTITUTION: The optical scanning of a bar code symbol is first performed in a sighting mode for scanning the symbol by using a closer first scanning pattern so that the symbol can be seen by a user in a relatively small size, and then, a larger and stronger second scanning pattern for decoding. A preferable scanner module is provided with a scanning mirror fitted to a bracket through a leaf spring and the leaf spring is constituted so that the mirror can be vibrated in one direction. The spring is hung from a fixed chassis by using two strips of a mylar (R) film. The two strips themselves are protected from mechanical shocks by means of pins passed through the holes of the bracket. The pins make the bracket to be accurately aligned with the chassis.

公开(公告)号：JPH05182009A

公开(公告)日：1993-07-23

申请号：JP14719092

申请日：1992-06-08

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： POORU DOBUOOKISU ,  DEIBUITSUDO PII GOOREN ,  GUREN ESU SUPITSUTSU ,  DANIERU AARU MATSUGURIIN

IPC: G06K7/10

Abstract: PURPOSE: To easily read two-dimensional bar codes. CONSTITUTION: A narrow first raster scanning pattern is formed by projecting a raster light beam upon a target. A user can manually direct the light beam 151 to a desired position by pointing the light beam at the position by using the first raster scanning pattern. A raster scanning system is provided with a scanner which emits the raster light beam and a second raster scanning pattern which sweeps all codes to be read and has a relatively wide width and a detector 158 which receives reflected light 152 from bar codes 170 and generates corresponding electric signals.

公开(公告)号：JPH03189787A

公开(公告)日：1991-08-19

申请号：JP28825390

申请日：1990-10-25

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： DEIBUITSUDO PII GOOREN ,  SEODOJIOSU PABURIDEISU ,  GUREN SUPITSUTSU

IPC: G06K19/06 ,  G06K7/016 ,  G06K7/10 ,  G06K7/14

Abstract: PURPOSE: To prevent bar code symbols from being unreadable by substituting illegal characters in a first expression with elements of corresponding characters in a second expression. CONSTITUTION: First, first and second original conversion images showing first and second analog scan signals are preserved. Thereafter, the second original conversion image is used to correct, namely, improve the first original conversion image, thereby generating a first corrected, namely, improved conversion image. With respect to correction of a distorted original conversion image, at least one element of a distorted character in the first distorted conversion image is changed based on at least one element of a corresponding character of the second original conversion image to generate the first corrected conversion image, thereby correcting the distorted original conversion image. Thus, all bar code symbols are accurately decoded from this first corrected conversion image, and they are prevented from being unreadable.