Method for orientating a grid mirror and grid mirror device

Patent metadata

Field	Value
Publication number	US-9383575-B2
Application number	US-201314397121-A
Country	US
Kind code	B2
Filing date	Feb 26, 2013
Priority date	Apr 24, 2012
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A method is described for aligning a light beam, having the steps of: deflecting the light beam by way of a first mirror element and a second mirror element, the first mirror element being displaced through a first deflection angle around a first rotation axis, and the second mirror element being displaced through a second deflection angle around a second rotation axis inclined with respect to the first rotation axis, and the second mirror element being additionally displaced through a third deflection angle around a third rotation axis that is inclined with respect to the second rotation axis, and the first mirror element being displaced around a first mirror normal line of the first mirror element through a first compensation angle defined for the third deflection angle, and/or the second mirror element being displaced around a second mirror normal line of the second mirror element through a second compensation angle defined for the third deflection angle.

First claim

What is claimed is:

1. A method for aligning a light beam, comprising:
deflecting the light beam by way of a first mirror element and a second mirror element, the first mirror element and the second mirror element being aligned with one another in such a way that one of:
a reflection of the first mirror element is incident onto the second mirror element, and
a reflection of the second mirror element is incident onto the first mirror element,

wherein the first mirror element is displaced through a first deflection angle around a first rotation axis, wherein the second mirror element is displaced through a second deflection angle around a second rotation axis inclined with respect to the first rotation axis;
during a displacement of the first mirror element through the first deflection angle around the first rotation axis and of the second mirror element through the second deflection angle around the second rotation axis, additionally displacing the second mirror element through a third deflection angle around a third rotation axis that is aligned with an inclination with respect to the second rotation axis; and
during a displacement of the second mirror element additionally through the third deflection angle around the third rotation axis, at least one of:
displacing the first mirror element around a first mirror normal line of the first mirror element through a first compensation angle defined for the third deflection angle, and
displacing the second mirror element around a second mirror normal line of the second mirror element through a second compensation angle defined for the third deflection angle.

2. The method as recited in claim 1 , further comprising:
during the displacement of the second mirror element additionally through the third deflection angle around the third rotation axis:
displacing the first mirror element around the first mirror normal line of the first mirror element through the first compensation angle defined for the third deflection angle, and
displacing the second mirror element around the second mirror normal line of the second mirror element through the second compensation angle defined for the third deflection angle.

3. The method as recited in claim 1 , wherein at least one of the first compensation angle and the second compensation angle is stipulated at least in consideration of the third deflection angle.

4. The method as recited in claim 3 , wherein at least one of the first compensation angle and the second compensation angle is stipulated additionally in consideration of at least one of the first deflection angle and the second deflection angle.

5. The method as recited in claim 1 , wherein a horizontal compensation angle corresponding to one of a first compensation angle and a second compensation angle is one of defined and stipulated in such a way that a vertical deformation D vert of two adjacent and horizontally aligned lines made up of light spots of the aligned light beam on a light impingement surface is reduced, the vertical deformation D vert being defined as
D vert =( y max −y min )/ y max ,

where y max is a maximum distance component in a vertical spatial direction of the light spots of the first horizontally aligned line from the light spots of the second horizontally aligned line, and y min is a minimum distance component in a vertical spatial direction of the light spots of the first horizontally aligned line from the light spots of the second horizontally aligned line.

6. The method as recited in claim 1 , wherein a vertical compensation angle corresponding to one of a first compensation angle and a second compensation angle is one of defined and stipulated in such a way that a horizontal deformation D hor of two adjacent and vertically aligned lines made up of light spots of the aligned light beam on a light impingement surface is reduced, the horizontal deformation D hor being defined as
D hor =( x max −x min )/ x max ,

where x max is a maximum distance component in a horizontal spatial direction of the light spots of the first vertically aligned line from the light spots of the second vertically aligned line, and x min is a minimum distance component in a horizontal spatial direction of the light spots of the first vertically aligned line from the light spots of the second vertically aligned line.

7. A method for projecting an image, comprising:
aligning a light beam by:
deflecting the light beam by way of a first mirror element and a second mirror element, the first mirror element and the second mirror element being aligned with one another in such a way that one of:
a reflection of the first mirror element is incident onto the second mirror element, and
a reflection of the second mirror element is incident onto the first mirror element,

wherein the first mirror element is displaced through a first deflection angle around a first rotation axis, wherein the second mirror element is displaced through a second deflection angle around a second rotation axis inclined with respect to the first rotation axis;
during a displacement of the first mirror element through the first deflection angle around the first rotation axis and of the second mirror element through the second deflection angle around the second rotation axis, additionally displacing the second mirror element through a third deflection angle around a third rotation axis that is aligned with an inclination with respect to the second rotation axis; and
during a displacement of the second mirror element additionally through the third deflection angle around the third rotation axis, at least one of:
displacing the first mirror element around a first mirror normal line of the first mirror element through a first compensation angle defined for the third deflection angle, and
displacing the second mirror element around a second mirror normal line of the second mirror element through a second compensation angle defined for the third deflection angle.

8. A mirror apparatus, comprising:
a first mirror element displaceable around a first rotation axis; and
a second mirror element displaceable around a second rotation axis inclined with respect to the first rotation axis, wherein the first mirror element and the second mirror element are alignable with one another in such a way that one of:
a reflection of the first mirror element is incident onto the second mirror element, and
a reflection of the second mirror element is incident onto the first mirror element,

wherein during a displacement of the first mirror element through a first deflection angle around the first rotation axis and of the second mirror element through a second deflection angle around the second rotation axis, the second mirror element is additionally displaceable through a third deflection angle around a third rotation axis is aligned with an inclination with respect to the second rotation axis, and
wherein during a displacement of the second mirror element additionally through the third deflection angle around the third rotation axis, at least one of:
the first mirror element is displaceable around a first mirror normal line of the first mirror element through a first compensation angle defined for the third deflection angle, and
the second mirror element is displaceable around a second mirror normal line of the second mirror element through a second compensation angle defined for the third deflection angle.

9. The mirror apparatus as recited in claim 8 , wherein during the displacement of the second mirror element additionally through the third deflection angle around the third rotation axis:
the first mirror element is displaceable around the first mirror normal line of the fir

Assignees

• Bosch Gmbh Robert

Inventors

• Fiess Reinhold
• Fischer Frank
• Pilard Gael
• Reiss Sebastion

Classifications

• H04N9/3129

  scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161) · CPC title

• G02B26/101 Primary

  with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129) · CPC title

• G02B7/1824

  Manual alignment · CPC title

• G02B7/1821

  for rotating or oscillating mirrors · CPC title

• G02B26/105

  with one or more pivoting mirrors or galvano-mirrors (G02B26/101 takes precedence) · CPC title