公开(公告)号：JP2000190711A

公开(公告)日：2000-07-11

申请号：JP36632399

申请日：1999-12-24

Applicant: PIRELLI PNEUMATICI SPA

Inventor： CARETTA RENATO

IPC: B60C11/12 ,  B29D30/06 ,  B60C11/03 ,  B60C11/11 ,  B60C11/13

Abstract: PROBLEM TO BE SOLVED: To provide a winter type tire with a tread pattern whose tread bands are especially suitable for traveling on a road covered with snow and/or ice, and its manufacturing method. SOLUTION: A tire especially designed for traveling on snow-covered road has a tread band 1 in a tread block 3. A first system and a second system of sipes 9 are formed in the block. Individual sipes are slanted in opposite direction in respect to a direction (n) perpendicular to a rolling surface of the treat bands 1. The sipes 9 extend along a curved extension part in recessed form to a grip end 10a with a sharp angle that is indicated by individual flexible parts 10 whose boundary is set by sipes themselves in the block 3. The peripheries of individual blocks 3 are partitioned by crosswise grooves 5 having first sides perpendicular to a rolling surface and second sides extending from the first side to the rolling surface itself, and lengthwise grooves.

公开(公告)号：JP2000162461A

公开(公告)日：2000-06-16

申请号：JP17429899

申请日：1999-06-21

Applicant: PIRELLI CAVI E SISTEMI SPA

Inventor： TIRLONI BARTOLOMEO ITALO ,  SARTORI FRANCESCO GABRIELE ,  SARCHI DAVIDE ,  ROBA GIACOMO STEFANO

IPC: G02B6/028 ,  G02B6/036 ,  H04J14/02 ,  G02B6/18 ,  G02B6/22

Abstract: PROBLEM TO BE SOLVED: To provide an optical transmitting fiber having a low non-linear coefficient and a high effective cross sectional area by setting a refraction index difference of a first glass layer to be lower than a maximum refraction index difference of a second glass layer by a specific % in an absolute value. SOLUTION: A first glass layer 14 surrounds an inner core 12 and has a refraction index difference Δn2 lower than a maximum refraction index difference Δn1 of the inner core 12. The refraction index difference means a difference of refraction indexes of a given glass layer and a clad 18. A second glass layer 16 surrounds the first glass layer 14 and has a maximum refraction index difference Δn3 above the maximum refraction index difference Δn1 of the inner core 12. The low-loss clad 18 surrounds the second glass layer 16. The refraction index difference Δn2 of the first glass layer 14 is improved by a dopant concentration in the first glass layer 14 so that the refraction index difference Δn2 lower than 10% of the refraction index difference Δn3 of the second glass layer 16 in an absolute value is generated.

公开(公告)号：JP2000101174A

公开(公告)日：2000-04-07

申请号：JP26900699

申请日：1999-09-22

Applicant: PIRELLI CAVI E SISTEMI SPA

Inventor： ANGELLIERI MARCO ,  CASTAGNETTI ROBERTA ,  SACCHI GIOVANNI

IPC: H01S3/10 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941

Abstract: PROBLEM TO BE SOLVED: To provide a pump device capable of obtaining higher coupling efficiency. SOLUTION: A pump device for coupling a pump beam to an active optical fiber that is constituted so as to have a light signal amplified, optically couples the first part of a pump beam 145 to an active fiber 130 optically, and includes a first optical coupler 150 with an insertion loss of 0.2 dB or less for the light signal and a second photocoupler 160 for receiving the second part of the pump beam from the first coupler 150. The second part of the pump beam is further optically coupled to the active fiber 130, and at least one portion of the second part of the pump beam is supplied to the active fiber 130. At least 70% coupling efficiency can be achieved with respect to the pump beam.

公开(公告)号：JP2000059304A

公开(公告)日：2000-02-25

申请号：JP14919199

申请日：1999-05-28

Applicant: PIRELLI CAVI E SISTEMI SPA

Inventor： BONATO GIANLUCA ,  MACCHI MAURO ,  OTTOLENGHI PAOLO

IPC: G02F1/01 ,  H04B10/02 ,  H04B10/18 ,  H04B10/29

Abstract: PROBLEM TO BE SOLVED: To reduce the non-linear distortion of an optical transmission system by rounding the edge part of an optical pulse to be received from the transmitter of the system so that a pulse to be used for modulation can be similar to a Gaussian pulse. SOLUTION: In order to promote the reduction of SPM/GVD distortion from an optical communication link, a transponder 43 is provided with an electric attenuator 44 placed between a photodiode 36 and an amplifier 38. This electric attenuator 44 smoothes the signal pulse of a sharp edge part by attenuating the said signal received by the amplifier 38. Especially, in order not to operate the amplifier 38 in deep saturated state, a predetermined attenuation level is applied to the electric signal received from the photodiode 36. When the electric attenuator 44 is placed in front of the amplifier 38, the electric signal to be inputted to the amplifier 38 is attenuated into power level lower than a power level for operating the amplifier 38 in the deep saturated state.

公开(公告)号：JP2000040425A

公开(公告)日：2000-02-08

申请号：JP18375099

申请日：1999-06-29

Applicant: PIRELLI CABLE CORP

Inventor： ANDERSON AARON ,  DAVIDSON GRANT ,  SACH JOHN

IPC: H01B7/282 ,  G02B6/44 ,  H01B11/22

Abstract: PROBLEM TO BE SOLVED: To provide a composite cable which distributes electric power to the components of an optical fiber network and transmits an optical signal between the components of the optical fiber network. SOLUTION: A composite cable includes at least one layer of insulated electric conductors 20 arranged in parallel to form a layer of conductors having a thickness substantially equal to that of the conductors. The conductors of at least one conductor layer have the S-Z twist, and surround the optical fibers 14 included in a loose 16 in at least one plastic buffer tube 12 to provide the cable and the optical fiber network including the cable with the desired structural and operational characteristics.

公开(公告)号：JPH11317120A

公开(公告)日：1999-11-16

申请号：JP5697899

申请日：1999-03-04

Applicant: PIRELLI GENERAL PLC

Inventor： SUTEHALL RALPH ,  LANG IAN DEWI

IPC: H01B7/00 ,  G02B6/44 ,  G02B6/48 ,  H01B17/42 ,  H02G7/00 ,  H02G7/05

Abstract: PROBLEM TO BE SOLVED: To limit a dry-band electric arc adjoining an earthed suspension portion of a wholly insulated self-supporting cable. SOLUTION: A device 22 to be used adjoining an earthed suspension portion 20 of a wholly insulated self-supporting cable 10 is suspended in an electric field from a pylon, etc., at the portion 20 in order to limit a dry-band electric arc adjoining the portion 20. The device 22 comprises members 34, 36 forming a sleeve 26 adjoining the portion 20 for fitting the cable thereinto and elements 38, 40, 42, 44 forming two closing parts 28, 30 for the sleeve. These closing parts each can engage with the cable at positions longitudinally spaced apart from each other and form a closed area 32 between the closing parts together with the cable and the sleeve. Use of the device 22 keeps outer surfaces of the cable dry over a portion 24 adjoining the portion 20 that may suffer a dry-band arc.

公开(公告)号：JPH11247044A

公开(公告)日：1999-09-14

申请号：JP28373598

申请日：1998-10-06

Applicant: PIRELLI

Inventor： BOIOCCHI MAURIZIO ,  ORJELA GURDEV

IPC: B29C70/20 ,  B60C9/00 ,  B60C9/08 ,  B60C9/20 ,  B60C9/22 ,  D03D1/00

Abstract: PROBLEM TO BE SOLVED: To decrease the weight of a casing of a pneumatic tire without influencing an undesirable effect on a mechanical strength and behavior, especially directional stability and riding comfort, of the tire in use. SOLUTION: This reinforcing woven fabric 9 for an article made from an elastomeric material, especially for pneumatic tire 1 has plural fibrous elements 10, 16 mutually parallel in a face positioned in a prescribed direction, adjacent to each other, and at least tensile strength. The reinforcing elements preferably codes 12, 13 are built into the elastomeric material and occupy 40% at maximum of the volume of the woven fabric.

公开(公告)号：JPH11240310A

公开(公告)日：1999-09-07

申请号：JP36865398

申请日：1998-12-25

Applicant: PIRELLI PNEUMATICI SPA

Inventor： ARMELLIN GIANCARLO ,  PETER KRONTHALER ,  ZOELLER THOMAS

IPC: B60C9/06 ,  B60C9/12 ,  B60C9/14 ,  B60C9/18 ,  B60C9/22

Abstract: PROBLEM TO BE SOLVED: To provide a tire being large in transversal curvature for motorcycles, achieving such a sufficient performance as road behavior, car stability at high speed, kilometric yielding, wear regularity and low weight in time of traveling on a straight road and a curve both. SOLUTION: A tire 1 being large in transversal curvature for motorcycles is equipped with a carcass structure 2 with at least one ply installed with two reinforced cords being almost parallel with each other and oriented in the direction tilted to a tire equatorial plane x-x, a belt structure 10 formed by a radial inner layer installed with a sheet made of an elastomer material, and a radial outer layer installed with plural circumferential coils 14a set up in the axial direction as arranged by the side of a cord 14 wound on the tire equatorial plane x-x at a nearly 0 deg. angle, respectively. This tire 1 is favorably related to such an optimum performance as road behavior, wear regularity, sufficient kilometric yielding and low weight at both cases of a straight traveling road and a curve.

公开(公告)号：JPH11179785A

公开(公告)日：1999-07-06

申请号：JP27072298

申请日：1998-09-25

Applicant: PIRELLI

Inventor： CARETTA RENATO ,  PESSINA ROBERTO ,  PRONI ANTONIO

IPC: B29C47/10 ,  B29C48/38 ,  B29C48/395 ,  B29C48/92 ,  B29D30/04 ,  B29K21/00 ,  B29K105/16 ,  B29L30/00 ,  B60C1/00 ,  C08K3/36 ,  C08K5/54 ,  B29C47/38

Abstract: PROBLEM TO BE SOLVED: To reduce a standard deviation between tires of different types as much as possible by continuously supplying a vulcanized material to an inlet of a final range, and maintaining a temperature and a viscosity value of a blend of an outlet of an initial range in a predetermined range. SOLUTION: A polymer material and various components from tanks 104 and 105 are continuously supplied to a transfer cooler 4 of a blend by a biaxial screw mixer 2 from a charging hopper 3. Further, not only the blend from the cooler 4 but also vulcanized components from tans 106 and 107 are continuously supplied directly from the hopper. At this time, a heating profile of the blend to be processed is controlled based on temperature and viscosity value at outlets C-C, A-A and B-B of the mixer 2 at two parts or more along the mixer 2. Thus, a standard deviation between the manufactured compounds is reduced, and its uniformity can be improved.

公开(公告)号：JPH1174839A

公开(公告)日：1999-03-16

申请号：JP17583098

申请日：1998-06-23

Applicant: PIRELLI CAVI E SISTEMI SPA

Inventor： GRASSO GIORGIO ,  RIGHETTI ALDO ,  OTTOLENGHI PAOLO ,  DONATI FABIO

IPC: H04B10/02 ,  H04B3/06 ,  H04B10/18

Abstract: PROBLEM TO BE SOLVED: To prevent the span length of an optical fiber between a power amplifier and a preamplifier or the span length of an optical fiber between adjacent line amplifiers from being limited by an available optical power at the input of the span. SOLUTION: The remote optical communication system includes a transmission station 104 that sends an optical signal with a power within the range from 18 dBm to 30 dBm and a fiber whose length is 100 km to 1000 km and whose dispersion is deviated. The remote optical communication system having an optical fiber transmission line 106 that sends the optical signal and an optical reception station 108 that receives the optical signal is provided with a color dispersion compensation device 115 between the transmission line 106 and optical receivers 110, 111.