# US 5,703,891 A · Pulse forming network assembly

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,703,891 A
- Document ID: US5703891A
- Status: Granted
- Kind: A
- Application number: 08/563,502
- Filed: 1995-11-28
- Granted: 1997-12-30
- Earliest claimed: 1995-11-28
- Assignees: Hughes Aircraft Company
- Inventors: Peter E. Phillips; Vikram D. Desai
- Web page: https://patentgrep.com/patent/US5703891A

## CPC

- H05B 41/34: to provide a sequence of flashes
- H05K 1/18: structurally associated with non-printed electric components (H05K1/16 takes precedence)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A unique pulse forming network assembly designed for use with a laser flashlamp. The inventive assembly includes a planar printed circuit board (14) to which a plurality of electrical energy storage elements (L1, C1) are mounted. The energy storage elements (L1, C1) are mounted on one side of the primed circuit board (14) so that the electrical contacts thereof extend therethrough. The contacts are wave soldered to complete the assembly. In a specific embodiment, the planar mounting of the energy storage elements (L1, C1) is enabled by the substitution of a conventional relay (K1) with a field effect transistor (Q1). The FET selectively connects the energy storage elements (L1, C1) to an output terminal of the network to activate the flashlamp. In a more specific embodiment, at least one of the energy storage elements is a capacitor (C1) which is connected to the housing (16) by a flange (18). The network is assembled by mounting a plurality of electrical components on one side of the printed circuit board (14) so that electrical terminals extend through the board. The terminals are then flow soldered to effect the electrical connection thereof.

## Claims

### Claim 1

A pulse forming network assembly for use with a laser flashlamp comprising:
a planar printed circuit board;
an electrical circuit, including a field effect transistor, mounted on a first side of the printed circuit board and having electrical contacts extending therethrough;
wave solder connected the electrical contacts of the electrical circuit on a second side of the printed circuit board; and
an energy storage element mounted on a second side of the printed circuit board, said energy storage element having terminals which are connected to said contacts of said electrical circuit.

### Claim 2 (depends on 1)

The invention of claim 1, wherein said energy storage element is a capacitor.

### Claim 3 (depends on 2)

The invention of claim 2, wherein said assembly is secured within a housing and said capacitor is secured to said housing by a flange.

### Claim 4 (depends on 2)

The invention of claim 2, wherein the capacitor has at least two leads and each of said leads extends from a single side of said capacitor.