Abstract: The present invention provides a data recording method a data recording and/or reproducing apparatus for recording data transmitted from a computer to a magnetic tape. In case a recording head fails to write data (data ID=582) of fragment ID=5 to a track (track 7), then, the data is rewritten to the first fragment (ID=0) of a next track (track 8). Thus, the data can be rewritten not on the track basis but on the fragment basis, which can reduce loss of tape capacity significantly.

Abstract: The present invention relates to an adaptive type equalization circuit and a playback apparatus employing the same that are suitable, for example, for being used for the playback of a digital signal. In the present invention, a playback signal is supplied to an analog to digital converter 6 and phase lock loop means 7 such that digital conversion of the playback signal is performed. Characteristic information such as a detection signal from an envelope detector 8 to which the playback signal is supplied, a signal showing a phase lock from the phase lock loop means 7 or the like is supplied to a data generation circuit 10 together with a playback signal from the analog to digital converter 6. The playback signal processed in the data generation circuit 10 and its characteristic information are supplied to a processor 11 such that operation for weighting coefficients is performed.

Abstract: A voice correspondence object featuring a sound recording medium such as a magnetic tape (2), a playback/recording head (3), an electronic device (21, 25) connected to the playback/recording head for recording sound on the recording medium, a speaker (24), a driving mechanism (4, 5, 6) for the magnetic tape and a spring (7) for moving the driving mechanism when it has been wound, and a current generator (18) powering the electronic device and driving means (5, 6) for the generator driven by the spring when the latter is wound.

Abstract: A servo writer generates a linear servo track timing based servo pattern comprised of transitions that extend laterally of the track. At least three spaced apart write elements, two of parallel azimuthal orientation, and at least one of a different azimuthal orientation, write patterns corresponding to the write elements, fixing both the distance between transitions having different azimuthal orientation, the “A” distance, and the distance between transitions having parallel azimuthal orientation, the “B” distance. The fixed distances provide precise sensing of lateral position based on a measure of time over the “A” distance compared to time over the “B” distance.

Abstract: A head carriage assembly drive system has a head carriage assembly having a head, a head carriage for moving the head in a radial direction of a rotating disk, a first drive unit for generating the power to rotate the head carriage and a second drive unit having a torque constant smaller than the torque constant of the first drive unit. Mainly the first drive unit is operated in a low-frequency band and mainly the second drive unit is operated in a high-frequency band, thereby reducing overall power consumption during tracking.

Abstract: A magnetic recording and reproducing apparatus extracts a record signal from a sum signal (ADD) of signals detected via first and second magnetic detection regions (RH1, RH2) that are formed to be offset in the lengthwise (TL) and widthwise (TW) directions of a recording track having an overlapping part in the widthwise direction (TW), and extracts servo information from a sub signal (SUB).

Abstract: A filter assembly for a data storage device. The filter assembly includes a flow passage having an inlet and outlet to provide a recirculating filter. The filter assembly is positioned to provide a pressure differential between the inlet and outlet of the flow passage. A breather filter includes an opening for ambient air exchange through a second flow passage which is opened to the pressure differential of the flow passage of the recirculating filter to enhance ambient air exchange. An air dam assembly interposed in an air flow path provides a high pressure region and low pressure region. An assembly structure includes an air dam and a filter flow passage to enhance the pressure differential across the flow passage. Flow turbulence through the flow passage is reduced via flow plates supported between raised edge portions of the flow passage.

Abstract: In a hard disk drive, at least one groove is formed in any of the base plate and the cover plate to pump air toward an outer side of the disk. An outer end of the groove is located at a position inwardly separated from an edge of the disk such that an air journal zone of predetermined width is formed along a circumferential direction of the disk between the outer end of the groove and the edge of the disk. The groove is formed in multiple numbers in a circumferential direction of the disk at a predetermined interval and is extended in a radial direction from an inner side of the disk and curved in a direction in which the disk rotates. Thus, vibration of the disk is reduced by a damping operation of air pumped by the groove having a high pressure in the air journal zone.

Abstract: A bottom track pole is formed on a surface of a bottom pole, a thin film coil is formed on the bottom pole to form a flat coplanar surface with the bottom track pole, a write gap film is formed on the flat coplanar surface, first and second magnetic material films constituting a top pole are formed on a flat surface of the thin film coil, and the second magnetic material film, first magnetic material film, write gap film and bottom track pole are partially removed by RIE to form a top track pole and trim structure in a self-aligned manner. The thin film coil is formed by a first thin film coil half and a second thin film coil half having coil windings which are formed in a self-aligned manner between successive coil windings of the first thin film coil half and have a two-layer structure of a first conductive film at least a part of which is formed by CVD and a second conductive film formed by electrolytic plating.

Abstract: A single-pole type magnetic head for perpendicular recording which reduces the amount of side writing even in the presence of a yaw angle and prevents the effective track width from decreasing, and a magnetic recording disk apparatus using the same. A main pole is composed of at least two portions where the width of the first portion continuously increases from the upstream side to the downstream side in the medium moving direction and the width of the second portion is the same as the width of the first portion's downstream edge in the medium moving direction and is constant from the upstream side to the downstream side in the medium moving direction. This prevents the recording magnetic field strength from decreasing at the track edge and increases the effective track width while suppressing side writing, thereby realizing a magnetic recording disk apparatus with a high track density.

Abstract: A thin-film magnetic head comprises first and second magnetic layers; a gap layer provided between the first and second magnetic layers; a coupling portion for magnetically coupling the first magnetic layer and the second magnetic layer to each other at a distance from the medium facing surface ABS; and a thin-film coil at least part of which is disposed between the first and second magnetic layers. The second magnetic layer has a pole portion layer and a yoke portion layer. The pole portion layer has a saturated magnetic flux density equal to or greater than that of the yoke portion layer. The yoke portion layer magnetically connects the upper end of the coupling portion and the rear end surface of the pole portion layer to each other.

Abstract: On a surface of a bottom pole, a write gap film and first magnetic material film having a high saturation magnetic flux density are formed, and the first magnetic material film is etched to remain a portion extending from an air bearing surface to a throat height zero reference position and a first non-magnetic film is formed in a removed portion. The first non-magnetic material film is polished to obtain a flat surface which is coplanar with a surface of the first magnetic material film. A second magnetic material film having a high saturation magnetic flux density is formed on the flat surface. The second magnetic material film, first magnetic material film, write gap film and bottom pole are partially removed by RIE using a mask formed on the flat surface in accordance with a given pattern to form a track pole having a double-layer structure consisting of bottom and to track poles and a trim structure in a self-aligned manner.

Abstract: A system and method for cleaning a tape media, such as a magnetic tape. The system preferably includes first and second cleaning heads. The first cleaning head has a plurality of spaced ridges defining a curved, tape-receiving face. The second cleaning head has including a plurality of lands spaced by shallow cavities configured to establish a sub-ambient condition. During use, a tape is transversed over the first cleaning head, with contact at leading edges formed by the ridges removing relatively large and loose particles. Relative to the second cleaning head, the tape partially wraps about a leading corner of the lands, due to the sub-ambient condition within the shallow cavities, facilitating removal of small, tacky debris. Processing by the cleaning heads simulates multiple passes over a magnetic head, thereby stabilizing magnetic tape. In alternative embodiments, the system includes only one of the first or second cleaning heads.

Abstract: A head assembly includes a suspension coupled to an end portion of an actuator arm located on a base to rotate around a pivot shaft, a head slider installed at the suspension and having a head to record and/or read information on and/or from a recording medium, and a variable device located between the suspension and the head slider, wherein one side of the variable device is coupled to the suspension to adjust a flying height of the head slider by adjusting inclination of the head slider with respect to the suspension. The head assembly can be applied to a magnetic head assembly by using a magnetic head and a magnetic disk as the head and the recording medium, respectively. Thus, since the variable device can be fixedly coupled to the suspension during the assembly process of the head assembly or the manufacture of the suspension, the process of manufacture is considerably simplified compared to the conventional magnetic head assembly.

Abstract: A magnetic tape recording system employing a single bump read-while-write head, methods of minimizing crossfeed signals between the read and write channels of magnetic tape recording systems, and electronic circuitry to implement such methods.

Abstract: A write gap film and a first magnetic material film are formed on a bottom pole, a first non-magnetic film is formed in a space formed by etching a portion of the first magnetic material film other than a portion extending from an air bearing surface to a throat height zero reference position to constitute a flat coplanar surface with the first magnetic material film, a second magnetic material film is formed on the flat coplanar surface, a two-layer track pole consisting of a top track pole and a bottom track pole is formed in a self-aligned manner by removing by RIE the second magnetic material film, first magnetic material film, write gap film and a part of the bottom pole, a second non-magnetic material film is formed to have a flat coplanar surface wit the top track pole, and a thin film coil is formed on the flat coplanar surface.

Abstract: A flux guide type includes a magnetoresistive device for reading a signal flux, and a flux guide for transmitting the signal flux to the magnetoresistive device, wherein the flux guide includes a laminated film that includes a ferromagnetic layer, a non-magnetic layer and a ferromagnetic layer in this order, and the two ferromagnetic layers in the flux guide have antiparallel directions of magnetization with respect to the non-magnetic layer.

Abstract: A multi-layer electrically conductive shunt is located on the exterior surface of a slider in electrical contact and extending between first and second lead ends of leads that are connected to a sensor of a read head. Electrically conductive spaced apart first and second read pads are located on the conductive shunt in electrical contact with the first and second lead ends via the conductive shunt. The conductive shunt includes a thick gold layer which is located between and interfaces an adhesion layer and a cap layer wherein the adhesion layer makes direct electrical contact with the aforementioned first and second lead ends.

Abstract: A magnetoresistive effect element which is easy to manufacture and in which a sense current is prevented from bypassing a barrier layer is provided. Also provided are a method for manufacturing the element and a magnetic recording apparatus utilizing the element. This magnetoresistive effect element utilizes an MTJ film which comprises, for forming its basic structure, a free layer, a barrier layer, a pinned layer and a pinning layer, wherein an oxide or a nitride layer is formed by oxidizing or nitriding metallic materials constituting the pinned layer and pinning layer.

Abstract: An electrical system includes a solid state relay (1) and an electrical connector (2) that connects solid state relay (1) to a load (4). The solid state relay (1) includes a power MOSFET (Q1) for switching power to the load (4). A PNP transistor (Q2) monitors the voltage drop across the power MOSFET (Q1), and shuts the power MOSFET off when the voltage drop exceeds a reference level. The solid state relay circuitry floats when the power MOSFET is commanded OFF so there is no leakage to ground. The relay (1) can be used with an electrical connector that includes a short pin (34) or shunt (16) that is disconnected before male and female terminals (12, 22) are unmated. Disconnection of the shunt (16) or the short pin (34) causes the power MOSFET to be commanded OFF so that there is no current flowing through the male and female terminals (12, 22) when they reach an arc susceptible position. The solid state relay (1) and the connector (2) are suitable for use in a 42 Volt automotive electrical system.

Abstract: A compressor is provided with a fluid tight electrical connector. The electrical connector is sealed against the sealed compressor housing, and a cable is attached to a connector housing. Since the cable is separately attached to the connector housing, it is not directly connected to terminal pins in the compressor. This reduces damage to those terminal pins. Further, unique sealing arrangements make the electrical connection fluid tight.

Abstract: System for surge protection of an object comprising a supply unit, which is connected to the secondary output of an external transformer. The secondary windings (1) of the external transformer are coupled in a star configuration, the star point of the transformer being connected to a downstream neutral conductor (7) and an earth electrode provided near to the transformer. In the supply unit, at least one phase conductor (6) is connected to the neutral conductor (7) by means of a surge protective device of a first type (4), and the neutral conductor (7) is connected to an earth electrode (5) provided near to the supply unit by means of a surge protective device of a second type (9). The surge protective device of the first type (4) comprises a voltage dependent resistor or varistor and the surge protective device of the second type (9) comprises a lightning current arrester or spark gap element.

Abstract: A power splitter that has a small package size and low cross-talk noise. The power splitter includes a low temperature co-fired ceramic (LTTC) substrate with several layers. Electrical components such as transmission lines and resistors are integrated onto and within the LTCC substrate. The power splitter provides impedance matching and dividing functions. The LTCC substrate has counter rotating spiral shaped circuit lines and electrically conductive vias extending therethrough. The vias are used to connect the power splitter to an external printed circuit board. The vias are also used to make electrical connections between the layers of the LTCC substrate. The counter rotating circuit lines allow the power splitter to have a small package size and low cross-talk noise.

Abstract: A submergence-responsive switching member driving circuit includes: a driving unit for driving a switching member of a vehicle so as to open or close it by means of a driving current that flows through between two current input-output ends; a first power terminal for supplying the driving current; relays having exciting coils and switching contacts Sw1, SW2, which, so long as a control current flows through the exciting coil, connect each of the current input-output ends to the first power terminal respectively by means of the switching contacts, and further there are provided power breaking means for breaking, when submerged in water, supply of the control current to the first exciting coil of the first relay.

Abstract: Provided is an electrostatic discharge protection circuit for protecting from electrostatic destruction an Integrated Circuit (IC) formed from a CMOS material that is capable of handling high frequencies and can withstand low voltage. The electrostatic discharge protection circuit has NMOS transistors, which are diode-connected transistors oriented in opposite directions, connected in parallel between a ground line and a line connecting an input terminal of the IC and the gate of an NMOS transistor included in an amplifier. The electrostatic discharge protection circuit is highly resistive to a surge voltage without impairment by high-frequency characteristics including noise and signal loss. The size of the IC need not be significantly increased to incorporate the new electrostatic discharge protection circuit, which is also highly cost effective since it requires fewer manufacturing steps to produce.

Abstract: In a method and a detector (7) for time-optimum reception of protection commands in a remote tripping device, at least two detector elements (1, 2) are operated, which are all designed for a signal at the same frequency but for different transmission times. Where at least one of these detector elements (1, 2) detects the presence of the signal, the signal is regarded as having been detected.

Abstract: A directional comparison distance relay system for protecting a power transmission line. The relay system comprises a fault detection unit which includes a directional distance relay element for deciding whether a fault is in forward or reverse directions; a short-circuit distance relay element for deciding whether a fault is within a protection zone by distance calculation; and an evolving fault detecting unit for deciding an evolving fault when a forward earth fault directional relay in a single phase and a reverse directional relay in a phase are in operation. The relay system further comprises a block unit for blocking trip of a circuit breaker at a near end due to the short-circuit distance relay, and for blocking permissive trip signal to a circuit breaker at the far end, based on an operation of the evolving fault detecting unit.

Abstract: An over-voltage protection device (51) for a secondary battery is disclosed which includes an outer casing (52) with plastic cover (53), terminals (56, 57, 58) and a piezoelectric actuator (54). Piezoelectric actuator (54) has first and second electrodes which are electrically connected to terminals (56, 57) respectively. Terminal (58) has a stationary electrical contact (60) mounted therein. The piezoelectric actuator (54) is cantilever mounted within casing (52) with a movable contact (61) mounted on its distal end that is positioned to be in engagement with stationary contact (60). When an over-voltage is applied between terminals (56, 57), it causes a displacement of the distal end of piezoelectric actuator (54) and correspondingly of the disengagement of movable contact (61) from stationary contact (60).

Abstract: The invention relates to a protective circuit for limiting the voltage for a device to be protected, particularly a load with an upstream-connected voltage and current limiting device, the device to be protected being provided in an output circuit of the protective circuit and is separable by means of a switching element, a voltage detector being provided with an electronic switch on the one hand and a voltage sensor on the other and the control terminal of the electronic switch is in electrical operative connection with the voltage sensor. A microdevice with a control circuit is provided, in which the microdevice has the switching element and is designed with a high input resistance of the control circuit.

Abstract: A device for voltage transformation of an input voltage into at least one output voltage is described, which includes at least one switching means (12), a freewheeling switching means (14), and an electrical energy accumulator (16, 18), the freewheeling switching means (14) being triggered for voltage transformation in normal operation. Monitoring means are provided for detecting when the output voltage exceeds a limit voltage, which trigger the freewheeling switching means (14) to limit the output voltage in the event the limit voltage is exceeded.

Abstract: In a remote tripping device and in a method for reception of digitally coded protection signals in a remote tripping device, a sequence of digital code words is received on a transmission channel, and a protection signal is regarded as having been received when a code which corresponds to this protection signal has been detected in this sequence a total of n times within a time window of predetermined length, wherein the number n is determined on the basis of an estimate of a measure at any given time of a disturbance on the transmission channel.

Abstract: A keyed filler panel with integrated recessed region for attaching device is disclosed. In one embodiment, the present invention is comprised of a filler panel body. The present embodiment is further comprised of a recessed portion integral with the filler panel body. The recessed portion is fixedly coupled with the filler panel body, and adapted to receive an attaching device for removably coupling the filler panel body with respect to a chassis.

Abstract: Based upon the results of an ID check with an ignition knob lock device which prevents rotational operation of an ignition knob which is used when stating an engine of a vehicle, and of an ID check with a portable unit, a passive control unit transmits to the ignition knob lock device a command to release prohibition of rotational operation of the ignition knob, and performs an ID check with the ignition knob lock device before detecting an operation of pushing in the ignition knob.

Abstract: A stand-alone voltage surge suppression device for use with household appliances is arranged for connection to conventional female wall type outlets. The device is made to plug into an outlet socket and protect the adjacent sockets. The surge components of the device include two sets of varistors and thermofuses. In this embodiment, there are two sets of varistors and thermofuses. One is a primary varistor and fuse combination set at a lower voltage, and the other is a secondary group set at a higher voltage. Both take effect in surge protection, however, with enough hits, the lower one will fail first. Even so, the secondary group will still provide sufficient, although reduced amount of protection. In order for the user to know the status of the unit, there are two indicator lamps on the outside of the device. The surge protector preferably includes a light source arranged to indicate when the primary pair of varistors stops functioning.

Abstract: According to one embodiment, a system is disclosed. The system includes a battery, a super-capacitor (SC) coupled in parallel to the battery, a computer system coupled to the battery and the SC, and a current limiter coupled to the battery the SC and the computer system. The current limiter prevents excess current from flowing from the battery to the SC.

Abstract: A new fixture which is capable of holding an HSA throughout all processes is invented so that Quasi-Static Test can be done before swaging. Handling operations are reduced and rework is made much easier. The invention further provides a process for testing the HSA by means of the fixture.

Abstract: An electrostatic discharge protection circuit for an integrated circuit that reduces unwanted transient currents during normal operations. In one embodiment, the electrostatic discharge protection circuit includes one or more electrostatic bus lines, a plurality of signal bonding pads and charge pumps. The one or more electrostatic bus lines are used to direct electrostatic discharge around internal circuitry. The plurality of signal bonding pads are used to receive external voltage signals. Each signal bonding pad is coupled to an associated electrostatic bus line via an unidirectional conducting device. A charge pump is used on each electrostatic bus line to precharge its associated electrostatic bus line to an associated predetermined voltage level.

Abstract: An electronic apparatus includes an electronic device including electronic circuits, a first connector connected to the electronic circuit, and static electricity removal means, and a control device which includes a plurality of second connectors for connecting the electronic device and which is electrically connected to the static electricity removal means when the electronic device is being inserted and is electrically connected to the electronic device only via the first connector and the second connectors when the electronic device is mounted. Thus, it is possible to gradually discharge the static electricity when the electronic device is inserted into the control apparatus.

Abstract: The present invention relates to a capacitive micro-electro-mechanical switch and method of manufacturing the same. In the capacitive micro-electro-mechanical switch for use in the radio frequency (RF) and the microwave driven by the electrostatic force, a capacitor of a 3-dimensional structure is formed on a signal transmission line. An ON capacitance is increased without increasing an capacitor area while preventing an increase in an OFF capacitance using the capacitor. Thus, an ON/OFF capacitance ratio of the capacitive micro-electro-mechanical switch can be increased and insertion loss and isolation characteristic could be improved.

Abstract: Disclosed is an electric shock device as used for protecting a user's body that applies a shock with a high voltage of power to an offender such as a burglar, a criminal, and so on. The electric shock device includes: a shock device case taking a shape of a gun or water pistol; a conductive liquid tank disposed in the rear portion of the shock device case for containing a predetermined amount of conductive liquid; a nozzle disposed on the top front portion of the shock device case for injecting the conductive liquid; an extra high voltage discharge assembling body formed adjacent to the conductive liquid tank for momentarily discharging an extra high voltage; an air tank disposed between the extra high voltage discharge assembling body and the nozzle in a way where the conductive liquid is injected to the nozzle; and a supply pipe for guiding and supplying the conductive liquid to the nozzle by virtue of the compressed air received in the air tank.

Abstract: A method for producing an on-chip signal transforming device. The method includes providing a substrate, and laying a first conductive layer above the substrate, wherein the first conductive layer has a plurality of interleaved inductors. The method then includes laying a second conductive layer above the substrate, wherein the second conductive layer has at least one inductor.

Abstract: This invention provides compositions of the formula Cu3Ta3MO12 wherein M is Al, Ga, Fe, Cr, Sc or mixtures thereof. These compositions have high dielectric constant and low loss over a frequency range of from 1 kHz to 1 MHz.

Abstract: A printed circuit board assembly adapted for immersion cooling is disclosed. The assembly includes a first circuit board having a first device side with a first portion configured to mount a first plurality of semiconductor devices. A second circuit board having a second device side with a second portion configured to mount a second plurality of semiconductor devices is disposed in confronting parallel relationship to the first circuit board. The assembly further includes a border element interposed between the first and second boards and disposed around the respective first and second portions. The border element cooperates with the first and second boards to form a liquid-tight container. An inlet formed in the border receives an electrically nonconducting liquid that is subsequently discharged through an outlet.

Abstract: A solid electrolytic capacitor includes a package 4 for entirely sealing a capacitor element 1, an anode lead terminal 2 connected to an anode wire 1a of the capacitor element 1, and a cathode lead terminal 3 kept in close contact with a side surface of the capacitor element, wherein both leads are exposed at the bottom surface of the package. The anode lead terminal is formed with an upwardly bent piece 2a provided with a positioning groove 2b. The anode wire of the capacitor element is fitted in the positioning groove, so that the upwardly bent piece completely bridges the gap between the anode wire and the anode lead terminal while accurately positioning the capacitor element at the center widthwise of the anode lead terminal and the cathode lead terminal.

Abstract: A control system for peripheral devices of a high-density server. A USB interface is used to connect several motherboards of a high-density server with a system connection back panel and a system management unit, and to control several peripheral devices. The control system of the invention includes a plurality of motherboard USB ports, a USB interface switching module, a USB extension device and a switch control unit.

Abstract: The system and methods of the present invention generally include retrofitting at least one shrouding device that is associated with a meter reading module drive shaft that operates within a meter reading module housing. Including at least one shrouding device about the meter reading module drive shaft substantially reduces rotational wiggle or play of the drive shaft within the housing of the meter reading module during operation by reducing the void between an outer surface of the drive shaft and an inner surface of a drive shaft channel of the housing, and/or by reducing the effects of tapered shafts or drive channels. In one embodiment, the shrouding device includes a sleeve device substantially secured around a portion of the shaft confined within the drive channel during rotational operation. In alternative embodiments, at least one bushing is secured to the shaft at one or more predefined portions of the shaft.

Abstract: An improved hand-held computing device is provided. The hand-held computing device includes a slidably retractable keyboard and battery compartment cover having a pair of elongate slide members extending from opposing edges of the cover. The slide members extend into a casing of the hand-held computing device for attaching the cover to the computing device. Each of the elongate slide members has a detent defined along a forward portion of the slide member for engaging a detent catch disposed in the interior of the casing for retaining the slide members from exiting from the casing and separating from the casing when the cover is retracted to an open position. A pair of ball assemblies is provided for allowing the slide members to slidably insert into and retract from the casing. The battery compartment includes an interior battery cover for closing the battery recess to prevent the battery from dislodging from the battery recess when the keyboard and battery compartment cover is in an open position.

Abstract: Electronic apparatus with keyboard module which can be rotated and hidden. The electronic apparatus includes an electronic apparatus main body and a keyboard module. One side of the main body is provided with pivot notches. The keyboard module is pivotally connected with the side of the main body via bracket members freely pivotally inlaid in the pivot notches. The keyboard module can be turned rearward to attach to back face of the main body and hidden behind the main body for easy carriage. In addition to the virtual keyboard on the operation panel of the electronic apparatus, a user can alternatively pivot the keyboard module toward the operation panel for quickly keying in data.

Abstract: A bracket attached to a peripheral device of a computer system aligns and attaches the peripheral device to the inside of a computer system chassis. The bracket is detachably mountable and includes a bracket body having an aperture therein through which the peripheral device is inserted. The bracket includes a support bar having a tab that fits into a slot in the chassis to securely hold the peripheral device in position such that the front panel of the peripheral device is aligned within an aperture in a face of the chassis.

Abstract: A protective sheath (1) for a personal digital assistant (3) includes a lower cover (13) and an upper cover (11). The upper cover includes a window (111) made of transparent plastic material, and two side wings (112) made of elastomer. The window includes a plastic base (114), and a coating including silicon oxide (113) on a surface of the base. Adherence between the base and the coating is very firm. The window is highly transparent, and has a very smooth and even surface, and has excellent wear-resistance. A method for forming the protective sheath includes the steps of: (1) injection molding the plastic base; (2) pre-treating the base; and (3) putting the base into a vacuum chamber for plasma chemical vapor deposition (PCVD) treatment, whereby the coating including silicon oxide is formed on the surface of the base.