含氮酚醛树脂在无卤覆铜板中的应用

本文主要介绍了含氮酚醛树脂在无卤覆铜板中的应用,用含氮酚醛树脂和苯并嗯嗪树脂固化环氧树脂制备的无卤覆铜板,具有高Tg,良好的耐热性、阻燃性以及良好的力学性能。     

低成本、高性能无卤覆铜板的研制

针对目前无卤覆铜板售价高,阻碍了覆铜板的无卤化进程,应用我公司商品化的苯并噁嗪、高含氮酚醛、含氮环氧树脂开发出一种低成本、高性能浅黄色的无卤覆铜板。板材具有高Tg、高韧性等优异性能。     

高性能BT树脂基覆铜板的研制

研制出了双烯封端棒状聚酰亚胺,并用其改性BT树脂,制得了低收缩BT树脂/石英布覆铜板。其平面方向热膨胀系数为3.1106℃1,厚度方向为1.3105℃1,优于国外同类产品;另用聚苯醚改性BT,制得低介电常数的BT树脂/玻璃布覆铜板,其er可小到3.6(106 Hz),厚度方向热膨胀系数为4.07×105℃1。改性后保留了BT树脂的其它优良特性。     

FR—4型覆铜板翘曲与解决措施

自踏入覆铜板行业至今三十余年,深感要做覆铜板很容易,但要做好却很难。说到做覆铜板很容易,以FR-4型覆铜板为例,不管你的树脂配方中DICY的用量是3.5还是2.7;上胶机烤箱的温度是150℃还是230℃,不管你用的是A级粘结片还是B级粘结片甚至是“垃圾料”,     

覆铜板用电子玻纤布供需分析及进口政策研究

在覆铜板的大类品种中,有两大类覆铜板要使用玻纤布。一类是以各种树脂作粘结剂的玻璃布基覆铜板,最大量的是环氧玻璃布基覆铜板,还有聚酰亚胺,BT树脂,聚四氟乙烯、聚苯醚树脂等玻璃布基覆铜板等。另一类是用电子玻纤纸（又称毡）或木浆纸作为芯层、用电子布作为面料制成的复合基覆铜板。     

影响覆铜板刚性的因素

文章以弯曲强度,拉伸强度及储能模量作为覆铜板刚性表征指标,对不同树脂体系的覆铜板刚性进行了相关考察,确认了覆铜板配本结构,树脂含量,温度等对覆铜板刚性的影响情况,从而在配本结构方面提出了改善覆铜板刚性的措施,为PCB生产过程中产生的翘曲或扭曲问题提供了新的改善方向。     

一种无卤高Tg高耐热覆铜板的制备

无卤中Tg覆铜板已成为主流的覆铜板产品,但市场对无卤高Tg高耐热覆铜板的期望也越来越强烈。本文制备了一种无卤高Tg高耐热覆铜板,该材料的Tg(DMA)>190℃,耐热性优异,Td(5%loss)>400℃,T300(带铜)>30min;并具有优异的粘结性能、优异的加工性能和低的CTE、极低的吸水率。     

新一代无铅兼容PCB基板材料的最新研究进展（2）

（续上期）2.1.22 各种覆铜板的热分层时间 图16为各种覆铜板的T288比较,各覆铜板包括聚苯醚／环氧、加填料聚苯醚／环氧、热心性聚苯醚、加填料180℃Tg Non-Dicy FR-4、加填料150℃Tg Non-Dicy FR-4、加填料150℃Tg Dicy周化FR-4、加填料170℃Tg无卤FR-4、未加填料175℃Tg Dicy固化FR-4、无铅热稳定性175℃Tg Dicy固化FR-4。     

PTFE在覆铜板中的应用

介绍了PTFE树脂的特性及其在覆铜板中的应用,阐述了PTFE覆铜板的主要种类,最后介绍国内PTFE覆铜板发展现状。     

新型苯并噁嗪树脂无卤覆铜板的研制

利用含有分子量宽分布的苯并噁嗪树脂和高含氮量的改性酚醛树脂制备的无卤覆铜板具有良好的耐热性(Td5%>350℃,T288>60min)、吸湿耐热性和较好的弯曲强度;板的韧性较好,裁板剪切时裂纹较少。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.