热敏打印头检测装置的设计与实现

发布时间：2019-05-08 21:20

【摘要】：热敏打印头(Thermal Print Head简称TPH)为热打印机关键部件,是采用焦耳热效应原理并通过相关逻辑部件进行控制,实现信息打印的部件。由于热敏打印头属于专用器件,精密且控制逻辑复杂,市场上没有通用的测试装置,也没有成熟的解决方案,为满足在线及成品检测的要求,设计并开发热敏打印头综合测试装置显得尤为重要。文中根据TPH的性能、参数,进行了测试需求的分析。测试需求主要包括两个方面:一是热敏打印头的各个输入、输出端子的短路、断路、漏电检测以及电流电压(IV)拟合特性测试;二是热敏打印头逻辑、时序功能及发热体阻值的测试。本文首先通过对热敏打印头的特性,尤其是专用逻辑控制集成电路(IC)特性的研究,针对测试需求制定了有针对性的测试方案,特别是引入并集成了IV测试法以检出IC隐含缺陷;选通至输出的时序测量法以测试IC的应答特性。其次采用专用的IV测试电路、独有的IC功能测试电路及精确的恒流测阻电路,并配合高效的现场可编程门阵列(FPGA),简单易用的ARM处理器,以及图形化且稳定的LabVIEW,实现了准确的IV测试、稳定的IC的性能测试、精确的阻值测试等产品集成测试功能。最后为验证系统的可靠性和可行性,对系统进行了实验、测试,实验表明此装置弥补了现有拼凑式的热敏打印头检测装置的功能单一、精度差、效率低、误测率高的不足,提高了产品不良检测能力。
[Abstract]:Thermal printer (Thermal Print Head (TPH) is a key part of thermal printer. It adopts the principle of Joule thermal effect and controls the related logic parts to realize information printing. Because thermosensitive printhead is a special device, precision and complex control logic, there is no universal testing device on the market and no mature solution. In order to meet the requirements of on-line and finished product detection, It is particularly important to design and develop a comprehensive test device for thermal print head. According to the performance and parameters of TPH, the test requirements are analyzed in this paper. The testing requirements mainly include two aspects: one is the input of the thermal printer, the short circuit of the output terminal, the broken circuit, the leakage detection and the current and voltage (IV) fitting characteristic test; The second is the test of thermal printer logic, timing function and heater resistance value. Firstly, through the study of the characteristics of the thermal printer, especially the (IC) characteristics of the ASIC, a specific test scheme is designed to meet the test requirements. In particular, the IV test method is introduced and integrated to detect the hidden defects of IC. The timing measurement method from strobe to output is used to test the response characteristics of IC. Secondly, the special IV test circuit, the unique IC function test circuit and the accurate constant current resistance measuring circuit are adopted, and the high efficiency field programmable gate array (FPGA), simple and easy to use ARM processor, as well as graphic and stable LabVIEW, are used. The product integration testing functions such as accurate IV test, stable IC performance test, accurate resistance test and so on are implemented. Finally, in order to verify the reliability and feasibility of the system, the system is tested and tested. The experiment shows that this device makes up for the shortcomings of the existing piecewise thermal printer detector, such as single function, poor precision, low efficiency and high rate of error measurement. Improved product inspection ability.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP334.8

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