David Frederick Welsh

US Patent:

6792177, Sep 14, 2004

Filed:

Mar 12, 2001

Appl. No.:

09/805528

Inventors:

David Edward Welsh - Yorba Linda CA
Roger Jonathan Helkey - Montecito CA
Adrian Keating - Santa Barbara CA
Daniel Jacob Blumenthal - Santa Barbara CA
Walter Joseph Fant - Los Gatos CA

Assignee:

Calient Networks, Inc. - San Jose CA

International Classification:

G02B 642

US Classification:

385 18

Abstract:

The invention provides an optical switch comprising a housing, an input optical fiber, a mirror substrate, an input pivoting mirror, an output optical fiber, a first optical splitter, and a first optical detector. The input optical fiber propagates a light beam and is secured to the housing. The mirror substrate is secured to the housing. The input pivoting mirror is located in a path of the light beam after leaving the input optical fiber. The input pivoting mirror is pivotally secured to the mirror substrate. Pivoting of the mirror relative to the mirror substrate alters an angle with which the light beam is reflected therefrom. The output optical fiber is secured to the housing and has an end through which the light beam enters after being reflected by the input pivoting mirror. The first optical splitter is located in a path of the light beam after leaving the input optical fiber. The first optical splitter splits the light beam into a first propagated portion and a first monitoring portion.

US Patent:

50909118, Feb 25, 1992

Filed:

Feb 7, 1991

Appl. No.:

7/652363

Inventors:

David E. Welsh - Tustin CA

Assignee:

ITT Corporation - New York NY

International Classification:

H01R 2370

US Classification:

439 79

Abstract:

A connector is described, which has several rows of contacts connected to two rows of leads that engage terminals on a circuit board assembly, which enables a large number of contacts to be located in a connector of moderate cost. A connector insert comprises a wafer device (44, FIG. 3) and multiple leads, the leads having front lead portions (50) connected to multiple rows of contacts (30) on the wafer device, middle lead portions (56) molded into the wafer device, and rearward lead portions (52) lying in two parallel rows for contacting terminals on opposite sides of the circuit board assembly. Each wafer device includes two substantially identical wafers (74, 76, FIG. 6), to allow molding of a single row of leads at a time into a wafer. Each wafer has forwardly projecting towers (130, FIG. 5) that each lie around the front portion of a lead, and each contact has a periphery captured by a tower portion and a hole that receives a lead front portion.

US Patent:

50889427, Feb 18, 1992

Filed:

Jul 15, 1991

Appl. No.:

7/729916

Inventors:

David E. Welsh - Tustin CA
David Rofer - Fountain Valley CA

Assignee:

ITT Corporation - New York NY

International Classification:

H01R 13187

US Classification:

439843

Abstract:

A high reliability socket contact assembly is provided, of the type that has a seamless exterior, which has tines with closely spaced initial and final points of pin contact engagement, and which has a closed entry region limiting the size of pin contacts that can be inserted, which can be constructed at low cost. The assembly includes a seamless barrel (12, FIG. 3) having a cylindrical cavity (16) extending into its front end, and a clip (20) formed of sheet metal rolled into a tube and lying in the cavity. The clip has a rearward portion (32), tines (42a-42d) extending forwardly from the rearward portion and having free forward tips, and a forward portion. The tips (56) of the tines have radially inner edges (60) lying on a first imaginary circle, and the forward portion of the barrel forms a closed entry region (72) having an inside diameter no greater than the diameter of the first imaginary circle, to prevent entry of pins of a diameter that could damage the tines. In one barrel (FIG. 3 ), the forward barrel portion has a flared front part (80), with the narrowest part of the flare forming the closed end region.

US Patent:

50662503, Nov 19, 1991

Filed:

Dec 21, 1990

Appl. No.:

7/605445

Inventors:

David E. Welsh - Tustin CA

Assignee:

ITT Corporation - New York NY

International Classification:

H01R 1364

US Classification:

439681

Abstract:

Polarizing keys are provided to allow only selected pairs of connectors to be mated, which allow one connector to be displaced slightly after mating, while also providing a large area of interference between nonmating keys to prevent their connectors from mating. Each key has an elongated keying portion with an interfitting side 94 (Fig. 9) which lies opposite the interfitting side of a similar corresponding key when the connectors are mated. Each interfitting side has forward and rearward parts 120, 122, with the rearward part 122 being indented with respect to the forward part.

US Patent:

50151924, May 14, 1991

Filed:

Nov 13, 1989

Appl. No.:

7/435111

Inventors:

David E. Welsh - Tustin CA
Albert H. Wilson - Los Angeles CA

Assignee:

ITT Corporation - New York NY

International Classification:

H01R 909

US Classification:

439 83

Abstract:

A method is described for installing contacts with their rear tail ends soldered to holes of a circuit board and their front mating ends insulative housing layers, which facilitates inspection of the solder connections to the circuit board and defluxing of the assembly after soldering. The front contact portions are partially inserted into holes in an elastomeric housing layer (50, FIG. 3) until a first forwardly-facing shoulder (76) on each contact abuts an abutment (92) on the elastomeric layer. The contact rear ends are inserted into corresponding holes in the circuit board (56) until a second rearwardly-facing shoulder on each contact abuts the front face of the board, and the contacts are then soldered to the board. The distance (H, FIG. 2) between the first and second contact shoulders is sufficient to provide a considerable gap (A) between the board and the elastomeric layer, so the solder connectiosn can be visually inspected.

US Patent:

53735730, Dec 13, 1994

Filed:

Jun 21, 1993

Appl. No.:

8/079762

Inventors:

David E. Welsh - Tustin CA

Assignee:

ITT Corporation - Secaucus NJ

International Classification:

G02B 636

US Classification:

385 69

Abstract:

A fiber optic connector is described, which has a retention clip (100, FIG. 4 ) that is part of the terminus so the clip is removed with the terminus from a connector housing, to enable replacement of a broken clip as well as to provide a more compact and low cost connector. The clip has a rear end (102) forming a ring that slides along the terminus body, and has a plurality of tines (104-107) that extend forwardly and radially outwardly. The free forward end of each tine has a rearwardly-facing clip shoulder (112) which abuts a forwardly-facing housing shoulder (114) so the clip cannot be removed in a rearward direction until the tines are deflected together. The front ends of the tines abut the rear end (92) of a spring that lies around the terminus body. The termini of the plug and receptacle connectors are identical except that one of the connectors (14, FIG. 5 ) uses a spacer (140) in place of a helical spring.

US Patent:

50469649, Sep 10, 1991

Filed:

Oct 10, 1989

Appl. No.:

7/419406

Inventors:

David E. Welsh - Tustin CA
Piyapote Pisalyaput - Irvine CA
William C. Gore - San Bernardino CA

Assignee:

ITT Corporation - New York NY

International Classification:

H01R 1352

US Classification:

439271

Abstract:

An electrical connector system is provided, of the type that includes housings of plastic-metal hybrid construction, which provides good moisture-tight sealing between the plastic shells and metal inserts and around grounding springs. The receptacle connector has a front edge to which the plastic shell and metal insert extend, and the plug connector includes a ring-shaped elastomeric first seal (90, FIG. 3) that is compressed by the front edge of the receptacle shell and insert (96, 98), to not only seal the inside of the mating regions of the connector but also to seal any slight gap (100) between the plastic shell and metal insert of the receptacle. The forward edge of the plug presses against a second elastomeric seal (92) which is on the receptacle, with the first and second seals sealing a region containing a grounding spring (80) that electrically connects the inserts of the plug and receptacle. Threaded connection between the plug and receptacle is through plastic threads (76, 78) on the outside of the receptacle shell and on the inside of the coupling nut on the plug. The system also includes a backshell device (24, FIG.

US Patent:

54114187, May 2, 1995

Filed:

Sep 1, 1993

Appl. No.:

8/115488

Inventors:

David E. Welsh - Tustin CA
Peter J. Hyzin - Lake Forest CA

Assignee:

ITT Corporation - Secaucus NJ

International Classification:

H01R 1342

US Classification:

439751

Abstract:

A method is described for fabricating an arrangement where a connector (12, FIG. 1) lies on a circuit board (14) and contacts (26) have forward contact parts lying in passages (18) of the connector insulator (16) and board-received contact parts lying in interference fit in holes (24) of the circuit board, which facilitates replacement of a single damaged contact. An installing tool (70, FIG. 3) has channels (80) that receive the forward contact parts (40) and leave the board-received contact parts (32) projecting therefrom. The installing tool with contacts therein is moved towards the circuit board to press the projecting board-received parts of the contacts into the circuit board holes (24). The installing tool is then removed, leaving the contacts behind with their forward parts projecting up from the circuit board. The connector insulator (16, FIG.