# US 8,783,221 B2 · Laser-induced spark ignition for an internal combustion engine

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- Number: US 8,783,221 B2
- Document ID: US8783221B2
- Status: Granted
- Kind: B2
- Application number: 13/129,052
- Filed: 2009-11-18
- Published: 2011-10-27
- Granted: 2014-07-22
- Earliest claimed: 2008-11-21
- Assignees: Robert Bosch GmbH
- Applicants: Pascal Woerner; Manfred Vogel; Juergen Raimann
- Inventors: Pascal Woerner; Manfred Vogel; Juergen Raimann
- Web page: https://patentgrep.com/patent/US8783221B2

## CPC

- F02P 23/04: Other physical ignition means, e.g. using laser rays
- F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00)

## Abstract

A laser ignition device is provided for an internal combustion engine, having an ignition laser in which a combustion chamber window has an orifice plate arranged in front of it.

## Claims

### Claim 1

A laser ignition device for an internal combustion engine, comprising:
an ignition laser having a laser-active solid, a combustion chamber window having a surface, and a housing, the combustion window being situated at an end of the housing and connected in a sealing manner;
wherein an orifice plate is situated at an outer end of the housing at which the combustion chamber window is situated inside the housing, creating a dead space between the orifice plate and the combustion chamber window;
wherein the orifice plate has a conical opening, the diameter of the conical opening of the orifice plate increasing in a direction of the combustion chamber window, and a cone angle of the orifice plate corresponds to an exit angle of the laser pulse.

### Claim 2 (depends on 1)

The laser ignition device as recited in claim 1 wherein a diameter of the orifice plate is dimensioned so that a laser pulse of the ignition laser is able to pass the orifice plate unhindered.

### Claim 3 (depends on 1)

The laser ignition device as recited in claim 1, wherein the orifice plate is a separate component, and is fastened to a shoulder of the housing.

### Claim 4 (depends on 1)

The laser ignition device as recited in claim 1, wherein the orifice plate is one piece with the housing.

### Claim 5 (depends on 4)

The laser ignition device as recited in claim 4, wherein the orifice plate is one piece with a shoulder of the housing.

### Claim 6 (depends on 1)

The laser ignition device as recited in claim 1, wherein the housing includes an inner sleeve and an outer sleeve.

### Claim 7 (depends on 1)

The laser ignition device as recited in claim 1, wherein, in an inserted state of the ignition laser, the orifice plate closes flush with a combustion chamber wall of the internal combustion engine.

### Claim 8 (depends on 1)

The laser ignition device as recited in claim 1, wherein the orifice plate screens the ignition laser only partially, and, in an inserted state of the ignition laser, the orifice plate is situated upstream of the ignition laser with reference to a main flow direction of exhaust gases in the combustion chamber.

### Claim 9 (depends on 1)

The laser ignition device as recited in claim 1, wherein the orifice plate screens the ignition laser over a circumferential angle of a maximum of 200°.

### Claim 10 (depends on 9)

The laser ignition device as recited in claim 9, wherein the orifice plate screens the ignition laser over a circumferential angle of 160° to 180°.