公开(公告)号：US5430633A

公开(公告)日：1995-07-04

申请号：US121168

申请日：1993-09-14

Applicant: David A. Smith

Inventor： David A. Smith

IPC: H02M3/335

CPC classification number: H02M3/33569 ,  Y02B70/1433

Abstract: A flyback-type power converter having a secondary-side resonant circuit which shapes the current waveform in the secondary winding and secondary circuit to reduce the RMS current values therein is described. The shaping reduces conduction losses and improves conversion efficiency. With the resonant circuit, the energy stored in the transformer is transferred during the OFF-period in substantially a fixed time duration, enabling a fixed-OFF period operation mode. The converter may further have a primary-side resonant circuit for capturing and recycling the energy stored the leakage inductance of the primary winding, which is normally wasted in snubber circuitry.

Abstract translation: 描述了具有次级侧谐振电路的反激式功率转换器，其对二次绕组中的电流波形和二次电路进行整形，以降低其中的RMS电流值。 整形降低了传导损耗并提高了转换效率。 利用谐振电路，存储在变压器中的能量在OFF周期内以大致固定的持续时间传送，从而能够进行固定关闭周期操作模式。 转换器还可以具有初级侧谐振电路，用于捕获和再循环存储初级绕组的漏电感的能量，其通常被浪费在缓冲电路中。

公开(公告)号：US5173846A

公开(公告)日：1992-12-22

申请号：US668587

申请日：1991-03-13

Applicant: David A. Smith

Inventor： David A. Smith

IPC: H02M1/44 ,  H02M3/335

CPC classification number: H02M1/44 ,  H02M3/33576

Abstract: A circuit for utilizing the magnetizing current in the transformer of a converter to reset the transformer's core and to provide a zero-voltage-switching condition on the converter's primary switch is disclosed. The power converter includes a transformer having a primary winding and a second winding, the secondary winding being coupled to an output load and a primary switch connected in series between the primary winding and a voltage source. The closing of the primary switch causes energy to be stored in the transformer and the opening of the primary switch causes the energy to be released from the transformer. The utilization circuit includes a series combination of a storage capacitor and a first switch coupled in parallel with one of the transformer's windings to capture the energy released from the transformer. The captured energy is used to reset the transformer's core and to create a zero voltage switching condition across the primary switch. A second switch means is connected in series with the secondary winding of the transformer and is operated to prevent the loading effects of the secondary from interrupting the creation of the zero-voltage switching condition.

Abstract translation: 公开了一种利用转换器的变压器中的磁化电流来复位变压器的磁芯并在转换器的主开关上提供零电压切换条件的电路。 功率转换器包括具有初级绕组和第二绕组的变压器，次级绕组耦合到输出负载和串联连接在初级绕组和电压源之间的初级开关。 主开关的关闭使得能量被存储在变压器中，并且主开关的断开导致能量从变压器释放。 利用电路包括存储电容器和与变压器绕组之一并联耦合的第一开关的串联组合，以捕获从变压器释放的能量。 捕获的能量用于复位变压器的内核并在主开关之间产生零电压开关条件。 第二开关装置与变压器的次级绕组串联连接，并且被操作以防止二次管的负载效应中断零电压开关条件的产生。

公开(公告)号：US5140727A

公开(公告)日：1992-08-25

申请号：US688230

申请日：1991-04-22

Applicant: Brian C. Dais ,  Jose Porchia ,  John O. McCree ,  David A. Smith ,  Larry M. Zieke

Inventor： Brian C. Dais ,  Jose Porchia ,  John O. McCree ,  David A. Smith ,  Larry M. Zieke

IPC: A44B19/16 ,  B65D33/25

CPC classification number: B65D33/2558 ,  B65D33/255 ,  A44B19/16 ,  Y10S24/40 ,  Y10S24/50 ,  Y10T24/2534 ,  Y10T24/45168

Abstract: A zipper for a reclosable thermoplastic bag which produces an audible clicking sound and/or a vibratory or bumpy feel when closed or "zipped", and processes and apparatus for making such zippers.

Abstract translation: 用于可再闭合热塑性袋的拉链，其在闭合或“拉链”时产生可听到的咔嗒声和/或振动或颠簸感，以及用于制造这种拉链的工艺和设备。

公开(公告)号：US5108773A

公开(公告)日：1992-04-28

申请号：US657479

申请日：1991-02-19

Applicant: David A. Smith ,  Kathleen M. Clark ,  Mark F. Firary

Inventor： David A. Smith ,  Kathleen M. Clark ,  Mark F. Firary

IPC: A23C19/076 ,  A23L29/262

CPC classification number: A23C19/0765 ,  A23L29/262 ,  A23C2250/25

Abstract: In the method of the present invention for making a non-fat cream cheese product, microcrystalline cellulose is blended with a source of concentrated skim milk and is mixed to provide a slurry. The slurry is subjected to high pressure, high shear homogenization treatment so as to microfluidize the components of the slurry and provide a microreticulated microcrystalline cellulose dispersion having a high viscosity. The final cream cheese formulation is then prepared by adding skim milk curd to the microfluidized slurry and adding the remaining ingredients, including spices, flavors, starch and a gum, to provide the non-fat cream cheese product of the invention.

公开(公告)号：US5002349A

公开(公告)日：1991-03-26

申请号：US442848

申请日：1989-11-29

Applicant: Kwok-Wai Cheung ,  Brian L. Heffner ,  David A. Smith

Inventor： Kwok-Wai Cheung ,  Brian L. Heffner ,  David A. Smith

IPC: G02F1/01 ,  G02F1/125 ,  G02F1/335

CPC classification number: G02F1/125 ,  G02F1/335 ,  G02F2001/0142 ,  G02F2203/055 ,  G02F2203/06

Abstract: An acousto-optica converter fabricated on x-cut (LiNbO.sub.3 and having an optical waveguide extending along the y-direction. An interdigital transducer is oriented at 5.degree. with respect to the y-direction in order to compensate for the acoustic walk-off on such an orientation. Such as integrated acousto-optical converter allows multiple stages of such converters so as to provide for (1) two-stage zero-frequency shifted converters and filters, (2) lasers using an acousto-optic filter as a tuning element, (3) polarization-independent converters in which the modes are divided, separately polarization converted, and recobined according to frequency, (4) and wavelength division multiplexing routing switches capable of simultaneously switching multiple channels.

Abstract translation: 在x切割（LiNbO3）上制造的声光转换器，具有沿y方向延伸的光波导，叉指换能器相对于y方向取向为5°，以补偿 诸如集成声光转换器允许这种转换器的多级，以便提供（1）两级零频移位转换器和滤波器，（2）使用声光滤波器作为调谐元件的激光器 ，（3）偏振无关转换器，其中模式被分割，单独极化转换，并根据频率进行重构，（4）和能够同时切换多个通道的波分复用路由交换机。

公开(公告)号：US4976673A

公开(公告)日：1990-12-11

申请号：US411423

申请日：1989-09-22

Applicant: David A. Smith ,  Albert C. Dowell ,  Herbert B. Geiger

Inventor： David A. Smith ,  Albert C. Dowell ,  Herbert B. Geiger

IPC: B31B23/00

CPC classification number: B31B23/00 ,  B31B2219/028 ,  B31B2237/10

Abstract: An apparatus for the continuous production of individual flexible products from a folded web of material, in particular, heat sealable thermoplastic material, is described having improved means for providing tension relief in such web material, and for tucking such web material outwardly from the surface of the product drum. The tuck rolls remain extended above the surface of the product drum throughout product drum rotation, and are retracted by cam arrangement to provide tension relief. Three alternative support assemblies and related cam arrangements are disclosed, two of which employ adjustable, compressible tuck roll support assemblies.

Abstract translation: 描述了一种用于从折叠的材料纤维网，特别是可热封的热塑性材料连续生产各种柔性产品的设备，其具有用于在这种纤维网材料中提供张力释放的改进的装置，并且用于将这种纤维网材料从 产品鼓。 卷筒辊在整个产品滚筒的旋转中保持延伸到产品鼓表面之上，并通过凸轮装置缩回以提供张力释放。 公开了三个替代的支撑组件和相关的凸轮装置，其中两个采用可调节的可压缩的折叠辊支撑组件。

公开(公告)号：US4925700A

公开(公告)日：1990-05-15

申请号：US263839

申请日：1988-10-28

Applicant: Blasius Brezoczky ,  Jerome J. Cuomo ,  C. Richard Guarnieri ,  Kumbakonam V. Ramanathan ,  Srinvasrao A. Shivashankar ,  David A. Smith ,  Dennis S. Yee

Inventor： Blasius Brezoczky ,  Jerome J. Cuomo ,  C. Richard Guarnieri ,  Kumbakonam V. Ramanathan ,  Srinvasrao A. Shivashankar ,  David A. Smith ,  Dennis S. Yee

IPC: C23C14/06 ,  C23C14/08 ,  C23C14/58 ,  G11B5/84 ,  G11B5/85

CPC classification number: G11B5/84 ,  G11B5/85

Abstract: A process for forming chromium dioxide thin films which are receptive to high density magnetic recording. The process comprises depositing both chromium and oxygen on a substrate by evaporative techniques and concurrently bombarding the substrate with high energy ions of at least one of the film constituents to form a latent CrO.sub.x film forming layer. The process is carried out at approximately room temperature.The as-grown latent film forming layer is subsequently heat treated by a rapid thermal anneal step which raises the temperature of the as-grown film to about 500.degree. C. The rapid thermal anneal step preferably comprises a series of at least five separte pulses over a 10-second time span. After the rapid thermal anneal, the sample is rapidly quenched to room temperature.

公开(公告)号：US4890236A

公开(公告)日：1989-12-26

申请号：US176472

申请日：1988-04-01

Applicant: Erik Kilk ,  David A. Smith ,  Alan W. Schmidt

Inventor： Erik Kilk ,  David A. Smith ,  Alan W. Schmidt

IPC: G01R27/28 ,  G01R15/08 ,  G01R23/173

CPC classification number: G01R23/173 ,  G01R15/08 ,  G01R27/28

Abstract: Upon the adjustment of a control setting of a test instrument, the current data (taken before the change is effected) is manipulated by recalculating the trace data in light of any adjustment that is entered by a user. This represents an estimate of the effect of the adjustment in the control setting, and this estimate is redrawn on a display device. This modified image is preferably displayed before the real new image is ready to be displayed. This provides immediate feedback to the user so that adjustments can be effected without slowing the measurement process. Various embodiments provide panning or repositioning the trace left and right while changing the x-axis center frequency; stretching or compressing the trace (spanning) while changing the frequency span; or using a combination for adjustments to only the start or stop frequency. In one embodiment, the estimate can be displayed only after the user has committed to having a new measurement performed. Alternatively, in another embodiment, estimates can be displayed continuously while the user is making adjustments and before the user has committed to performing a new measurement. Having a test instrument display to the user an estimate of a future measurement while adjusting the control settings of the instrument in order to aid knob and button settings facilitates making adjustments visually during measurements which take longer than a fraction of a second. By having an immediate response on the display device, the user is not required to make blind changes.

公开(公告)号：US4872208A

公开(公告)日：1989-10-03

申请号：US249865

申请日：1988-09-27

Applicant: Steven K. Beattie ,  Paul C. Richards ,  David A. Smith

Inventor： Steven K. Beattie ,  Paul C. Richards ,  David A. Smith

IPC: G01P3/488

CPC classification number: G01P3/488

Abstract: A motion detection device such as a tachometer generator (10), is disclosed for the detection of the rotation of a body or shaft around an axis. The generator (10) includes a perforated disc (15) mounted on a shaft (8), and a sensing device (24) including a coil (25) and magnet (21) mounted in close proximity to the perforated disc (15). The disc (15) is made of a ferrous material. When rotated, the alternating holes (16,17) and webs (18) in the disc (15) produce an alternating current in the sensor (24), the frequency of which is proportional to the rotational speed of the disc. Any number of sensors (24) may be used and the disc (15) may have any number of holes (16,17). The signal developed by each or any sensor (24) is transmitted by wires (1,2) to a suitable indicating or recording device.

Abstract translation: 公开了诸如转速计发生器（10）的运动检测装置，用于检测主体或轴绕轴线的旋转。 发电机（10）包括安装在轴（8）上的穿孔盘（15）和包括安装在穿孔盘（15）附近的线圈（25）和磁体（21）的感测装置（24）。 盘（15）由铁质材料制成。 当旋转时，盘（15）中的交替孔（16,17）和腹板（18）在传感器（24）中产生交变电流，其频率与盘的旋转速度成比例。 可以使用任何数量的传感器（24），并且盘（15）可以具有任何数量的孔（16,17）。 由每个或任何传感器（24）展开的信号通过导线（1,2）传输到合适的指示或记录装置。

公开(公告)号：US4284301A

公开(公告)日：1981-08-18

申请号：US28633

申请日：1979-04-09

Applicant: Herbert B. Geiger ,  David A. Smith

Inventor： Herbert B. Geiger ,  David A. Smith

IPC: B65H5/08 ,  B66C1/42

CPC classification number: B65H5/08

Abstract: Apparatus for clamping and transferring to another location a stack of thermoplastic bags or the like wherein the bag walls have varying thicknesses. The apparatus preferably includes sets of clamping jaws for grasping the stack of bags. Each set comprises two pairs of the jaws. One pair is designed to rigidly clamp upon the stack while the other pair is spring-loaded or otherwise adjustable so that it can close differently than the first pair to compensate for the varying bag thicknesses even when the pairs of jaws are closed by the same drive mechanism. Each set of clamping jaws is independent of the other so that they can operate independently if one set were to jam.

Abstract translation: 用于夹紧和转移到另一位置的装置，其中袋壁具有变化的厚度。 该装置优选地包括用于抓握袋子的一组夹爪​​。 每组包括两对夹爪。 一对被设计成刚性地夹紧堆叠，而另一对被弹簧加载或可调节，使得其可以与第一对不同地闭合，以补偿不同的袋厚度，即使当成对的夹爪由相同的驱动器封闭时 机制。 每组夹爪彼此独立，因此如果一套卡住，它们可以独立运行。