Method for orientating a grid mirror and grid mirror device

• US 9,383,575 B2
• Filed: 02/26/2013
• Issued: 07/05/2016
• Est. Priority Date: 04/24/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Fiess, Reinhold, Fischer, Frank, Pilard, Gael, Reiss, Sebastion
• Primary Examiner(s): LE, BAO-LUAN Q
• Application Number:
  US14/397,121
• Publication Number:
  US 20150138517A1
• Time in Patent Office: 1,225 Days
• US Class Current: 1/1
• CPC Class Codes: G02B 26/0816 by means of one or more reflecting elements
• CPC Class Codes: G02B 26/101 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 Class Codes: G02B 26/105 with one or more pivoting mirrors or galvano-mirrors G02B26/101 takes precedence
• CPC Class Codes: G02B 27/0031 for scanning purposes
• CPC Class Codes: G02B 7/182 for mirrors
• CPC Class Codes: G02B 7/1821 for rotating or oscillating mirrors
• CPC Class Codes: G02B 7/1822 comprising means for aligning the optical axis G02B7/1821 takes precedence
• CPC Class Codes: G02B 7/1824 Manual alignment
• CPC Class Codes: G02B 7/1825 made by screws, e.g. for laser mirrors
• CPC Class Codes: G02B 7/1827 Motorised alignment
• CPC Class Codes: G03B 21/2066 Reflectors in illumination beam in projection beam G03B21/28
• CPC Class Codes: H04N 9/3129 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

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.

Claims

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 first mirror element through the first compensation angle defined for the third deflection angle, and

the second mirror element is displaceable around the second mirror normal line of the second mirror element through the second compensation angle defined for the third deflection angle.

10. The mirror apparatus as recited in claim 8, further comprising:

a control device with which at least one of the first compensation angle and the second compensation angle can be stipulated at least in consideration of the third deflection angle.

11. The mirror apparatus as recited in claim 10, wherein the control device stipulates at least one of the first compensation angle and the second compensation angle additionally in consideration of at least one of the first deflection angle and the second deflection angle.

12. The mirror apparatus as recited in claim 8, wherein a horizontal compensation angle corresponding to one of a first compensation angle and a second compensation angle is one of defined and capable of being 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.

13. The mirror apparatus as recited in claim 8, wherein a vertical compensation angle corresponding to one of a first compensation angle and a second compensation angle is one of defined and capable of being 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.

14. The mirror apparatus as recited in claim 8, the mirror apparatus being embodied as at least one of a micromirror, a projector, and a scanner.

15. A mobile telephone, comprising:

a mirror apparatus, including;

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.

16. A personal digital assistant device, comprising:

a mirror apparatus, including;

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 having a mirror apparatus.