Microelectromechanical apparatus with tiltable bodies including variable tilt-stop engaging portions and methods of operation and fabrication therefor

• US 6,491,404 B2
• Filed: 05/18/2001
• Issued: 12/10/2002
• Est. Priority Date: 02/23/2001
• Status: Expired due to Term

• Current Assignee: Lumentum Operations, LLC (Lumentum Holdings Inc.)
• Original Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Inventors: Hill, Edward A.
• Primary Examiner(s): Sikder, Mohammad
• Application Number:
  US09/860,855
• Publication Number:
  US 20020118472A1
• Time in Patent Office: 571 Days
• Field of Search: 359/872, 359/871, 359/296, 359/298, 359/233, 359/198, 359/223, 359/224
• US Class Current: 359/872
• CPC Class Codes: B81B 2201/042 Micromirrors, not used as optical switches
• CPC Class Codes: B81B 2203/0181 See-saws
• CPC Class Codes: B81B 2203/058 Rotation out of a plane parallel to the substrate
• CPC Class Codes: B81B 3/0051 For defining the movement, i.e. structures that guide or limit the movement of an element mechanical arrangements for preventing or damping vibration or shock H01H3/60
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means

Abstract

A micromechanical apparatus includes a microelectronic substrate and a tiltable body thereon. The tiltable body includes a plate configured to tilt about an axis parallel to the microelectronic substrate and a tilt stop engaging portion disposed axially adjacent the plate. A range of rotation of the plate about the axis is defined by contact of the tilt stop engaging portion with a tilt stop on the substrate. The microelectronic substrate may have an opening therein configured to receive the plate, and the tilt stop may include a surface of the microelectronic substrate adjacent the opening. An actuator, such as an electrostatic actuator, may tilt the tiltable body about the axis. Related operation and fabrication methods are also described.

Claims

1. An apparatus, comprising:

a microelectronic substrate; and

a tiltable body including a plate configured to tilt about an axis and a tilt stop engaging portion axially displaced along the axis with respect to the plate, wherein a range of rotation of the plate about the axis is defined by contact of the tilt stop engaging portion with a tilt stop on the substrate.

2. The apparatus of claim 1, wherein the axis is arranged substantially parallel to the microelectronic substrate.

3. The apparatus of claim 1, wherein the tilt stop comprises a surface of the microelectronic substrate.

4. An apparatus, comprising:

a microelectronic substrate; and

a tiltable body including a plate configured to tilt about an axis and a tilt stop engaging portion axially displaced with respect to the plate, wherein a range of rotation of the plate about the axis is defined by contact of the tilt stop engaging portion with a tilt stop on the substrate,

wherein the plate extends a first radial distance from the axis; and

wherein the tilt stop engaging portion extends a second radial distance from the axis that is different from the first distance.

7. The apparatus of claim 4, wherein the tiltable body is attached to the microelectronic substrate by first and second spaced apart supports.

8. The apparatus of claim 7, wherein the tiltable body comprises first and second beams attached to respective ones of the first and second spaced-apart supports.

9. The apparatus of claim 4, further comprising an optical device region on the plate.

10. The apparatus of claim 9, wherein the optical device region comprises at least one of a mirror, a lens, a prism, and an optical source.

11. The apparatus of claim 4, further comprising an actuator operative to tilt the tiltable body about the axis.

5. An apparatus, comprising:

a microelectronic substrate; and

a tiltable body including a plate configured to tilt about an axis and a tilt stop engaging portion axially displaced with respect to the plate, wherein a range of rotation of the plate about the axis is defined by contact of the tilt stop engaging portion with a tilt stop on the substrate,

wherein the microelectronic substrate has an opening therein configured to receive the plate; and

wherein the tilt stop comprises a surface of the microelectronic substrate adjacent the opening.

6. The apparatus of claim 5, wherein the opening extends through the microelectronic substrate.

12. An apparatus, comprising:

a microelectronic substrate; and

a first tiltable body including a first plate configured to tilt about a first axis and a first tilt stop engaging portion axially displaced with respect to the first plate, wherein a first range of rotation of the first plate about the first axis is defined by contact of the first tilt stop engaging portion with a first tilt stop on the substrate; and

a second tiltable body including a second plate configured to tilt about a second axis and a second tilt stop engaging portion axially displaced with respect to the second plate, wherein a second range of rotation of the second plate about the second axis is defined by contact of the second tilt stop engaging portion with a second tilt stop on the substrate.

13. The apparatus of claim 12, wherein the first and second plates each have the same radial extent with respect to the respective first and second axes, and wherein the first and second ranges of rotation are different.

14. The apparatus of claim 12, wherein the first and second plates have respective different radial extents with respect to the respective first and second axes, and wherein the first and second ranges of rotation are the same.

15. A micromechanical device, comprising:

a microelectronic substrate; and

a tiltable body on the microelectronic substrate, the tiltable body including an optical device region configured to tilt about an axis over an angular range defined by contact of an axially displaced tilt stop engaging portion of the tiltable body with a tilt stop on the substrate, wherein the tilt stop engaging portion is displaced from the optical device region along the axis.

16. The apparatus of claim 15, wherein the axis is substantially parallel to the microelectronic substrate.

17. The apparatus of claim 15, wherein the optical device region comprises at least one of a mirror, a lens, a prism and an optical source.

18. The apparatus of claim 15, wherein the microelectronic substrate has an opening therein configured to receive a portion of the tiltable body as it tilts about the axis.

19. The apparatus of claim 18, wherein the tilt stop comprises a surface of the microelectronic substrate adjacent the opening.

20. The apparatus of claim 15, wherein the tiltable body is attached to the microelectronic substrate by first and second spaced apart supports.

21. The apparatus of claim 20, wherein the tiltable body further comprises first and second beams attached to respective ones of the first and second supports.

22. The apparatus of claim 15, further comprising an actuator operative to tilt the tiltable body about the axis.