Invention Grant
US08169589B2 Adaptive focusing using liquid crystal zone plates in electro-optical readers
有权
在电光读取器中使用液晶区域板进行自适应聚焦
- Patent Title: Adaptive focusing using liquid crystal zone plates in electro-optical readers
- Patent Title (中): 在电光读取器中使用液晶区域板进行自适应聚焦
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Application No.: US12077230Application Date: 2008-03-18
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Publication No.: US08169589B2Publication Date: 2012-05-01
- Inventor: David Tsi-Shi
- Applicant: David Tsi-Shi
- Applicant Address: US NY Holtsville
- Assignee: Symbol Technologies, Inc.
- Current Assignee: Symbol Technologies, Inc.
- Current Assignee Address: US NY Holtsville
- Agent Nong-Qiang Fan
- Main IPC: G02F1/13
- IPC: G02F1/13 ; C09K19/02
Abstract:
Working range and beam cross-section are adjusted in an electro-optical reader for reading indicia by applying voltages to electrodes in one or more liquid crystal zone plates in which the index of refraction is changed in different regions of each zone plate.
Public/Granted literature
- US20090237575A1 Adaptive focusing using liquid crystal zone plates in electro-optical readers Public/Granted day:2009-09-24
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