Mirror positioning apparatus for use in beam switching

• US 7,982,935 B2
• Filed: 12/31/2008
• Issued: 07/19/2011
• Est. Priority Date: 12/31/2008
• Status: Active Grant

• Current Assignee: IPG Photonics Corporation
• Original Assignee: IPG Photonics Corporation
• Inventors: Digiantommaso, Michael, Jones, William D., Grapov, Yuri
• Primary Examiner(s): Cherry; Euncha P
• Application Number:
  US12/317,997
• Publication Number:
  US 20100165435A1
• Time in Patent Office: 930 Days
• Field of Search: 385/18, 359/212.1, 359/213.1, 359/214.1, 359/872
• US Class Current: 359/212.1
• CPC Class Codes: B23K 26/0676 into dependently operating sub-beams, e.g. an array of spots with fixed spatial relationship or for performing simultaneously identical operations
• CPC Class Codes: G02B 26/0816 by means of one or more reflecting elements
• CPC Class Codes: G02B 27/1073 characterized by manufacturing or alignment methods
• CPC Class Codes: G02B 27/144 using partially transparent surfaces without spectral selectivity G02B27/147 takes precedence
• CPC Class Codes: H01S 3/005 Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping shaping laser beam for working metal or other materials B23K26/06; optical elements, systems or apparatus in general G02B

Abstract

A mirror positioning assembly for use in beam switching is provided that employs a novel arrangement of the mirrors and the motors to selectively position the mirrors. The assembly is installed into the housing of an assembly for distributing laser energy where the mirrors are contained within the beam cavity and the remainder of the assembly is outside of the housing. The assembly is received in a port within the housing in a manner that allows 360° of rotational adjustment so that the mirror can be carefully aligned to insure near lossless distribution of the beam energy as it passes through the device. This arrangement keeps the electronics, motors, bearings and adjustments of the mirror switching external to the beam cavity herby reducing the number of potential contaminants contained therein.

Claims

1. A mirror apparatus for selectively distributing energy from at least one laser beam comprising:

a support plate with an aperture therethrough;

a rotatable shaft extending through said aperture;

a mirror affixed to a first end of said shaft;

a motor operative to apply a torque to the shaft; and

a flexible drive interface located between and coupled to said motor and a second end of said shaft, said flexible drive interface being configured to prevent vibrations of the motor to be transferred into the rotatable shaft.

3. The mirror apparatus of claim 1, wherein said motor is a stepper motor.

4. The mirror apparatus of claim 1, wherein said motor selectively moves the mirror between an in-beam position and an out-of beam position.

2. A mirror apparatus of for selectively distributing energy from at least one laser beam comprising:

a support plate with an aperture therethrough;

a rotatable shaft extending through said aperture;

a mirror affixed to a first end of said shaft;

a flexible drive interface affixed to a second end of said shaft; and

a bearing/bushing unit in said aperture and about said shaft to precisely guide rotation of said shaft.

5. A mirror apparatus of for selectively distributing energy from at least one laser beam comprising:

a support plate with an aperture therethrough;

a rotatable shaft extending through said aperture;

a mirror affixed to a first end of said shaft;

a flexible drive interface affixed to a second end of said shaft; and

a coolant path integrated within the apparatus.

6. The mirror apparatus of claim 5 further comprising:

a housing having a control port therein for receiving said mirror apparatus, said control port including a seat formed therein,

wherein the support plate of the mirror apparatus includes a rounded support shoulder extending around an outer surface thereof, said support shoulder contacting said seat when said mirror apparatus is received in said control port such that an angular position of said mirror apparatus can be adjusted relative to said housing.

7. The mirror apparatus of claim 6, wherein the support plate includes set screws therein to adjust the angular position of said mirror apparatus can be adjusted relative to said housing.

8. The mirror apparatus of claim 6, wherein said minor is releasably secured to said shaft.

9. The mirror apparatus of claim 8, wherein said mirror is secured to said shaft after the support plate is installed into said housing.

10. The mirror apparatus of claim 6, wherein said housing contains a beam cavity therein, said mirror being positioned within said beam cavity and said motor being external to said beam cavity.