Fresnel lens with variable-angle translation edges

Patent metadata

Field	Value
Publication number	US-12313861-B1
Application number	US-202217990200-A
Country	US
Kind code	B1
Filing date	Nov 18, 2022
Priority date	Oct 25, 2022
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

A lens assembly includes a lens housing and a Fresnel lens array. The lens housing includes a first portion that defines an exterior surface and an interior surface, and a second portion. The second portion defines a cavity, where the interior surface is disposed within the cavity. The Fresnel lens array is disposed within the cavity and coupled to the interior surface. The Fresnel lens array includes a first lens element and a second lens element. The first lens element has first concentric grooves defined by first translation edges and first facets. The first translation edges are disposed at thirty degrees relative to a first center point of the first concentric grooves. The second lens element has second concentric grooves defined by second translation edges and second facets. The second translation edges are disposed at one degree relative to a second center point of the second concentric grooves.

First claim

What is claimed is:

1. A device, comprising:
a camera;
a wireless interface;
a passive infrared (PIR) sensor;
a lens assembly including:
a lens housing having:
an exterior surface,
an interior surface, and
a cavity; and
a Fresnel lens array including:
a first surface facing an exterior of the electronic device, and
a second surface facing an interior of the electronic device, the second surface having:
a plurality of lens facets, each lens facet comprising a curved face, and
a plurality of concentric grooves defined at least in part by translation edges and facets, and wherein a first portion of the plurality of concentric grooves includes first translation edges disposed at a first angle relative to a first plane, wherein the first plane is generally perpendicular to the first surface, and second portion of the plurality of concentric grooves includes second translation edges disposed at a second angle relative to a second plane, the first angle being substantially greater than zero, and the second angle being substantially less than the first angle.

2. The device of claim 1 , wherein:
the first angle is approximately thirty degrees;
the second angle is approximately one degree;
a first translation edge of the first translation edges has a width of approximately 5 micrometers,
the second translation edges are located proximate a center of the lens array; and
the first translation edges are located proximate a perimeter of the lens array.

3. The device of claim 1 , wherein the device comprises one or more computer readable media containing computer executable instructions for performing operations comprising:
receiving, at a controller of the device from an integrated circuit of the PIR sensor, a signal; and
based on the signal, powering up the camera.

4. A device, comprising:
a passive infrared (PIR) sensor;
a lens array including:
a first surface facing an exterior of the electronic device, and
a second surface facing an interior of the electronic device, the second surface having:
lens facets, and
translation edges, each translation edge extending between two lens facets;
wherein, for each respective translation edge of a first plurality of the translation edges, a cross-sectional profile of the respective translation edge of the first plurality of the translation edges is angled at a first angle relative to a first plane, and
wherein, for each respective translation edge of a second plurality of the translation edges, a cross-sectional profile of the respective translation edge of the second plurality of the translation edges is angled at a second angle relative to a second plane, the second angle being less than the first angle.

5. The device of claim 4 , wherein:
each lens face comprises a curved surface; and
each translation edge comprises a flat surface.

6. The device of claim 4 , wherein the first plane is generally perpendicular to the first surface.

7. The device of claim 4 , wherein the first plane intersects the first surface or the second surface.

8. The device of claim 4 , wherein the device further comprises a second PIR sensor, and a lens assembly including a lens housing having an exterior surface, an interior surface, and a cavity.

9. The device of claim 4 , wherein the second angle is approximately one degree.

10. The device of claim 4 , wherein the first angle is approximately thirty degrees.

11. The device of claim 4 , wherein the second plurality of translation edges are located proximate a center of the lens array.

12. The device of claim 4 , wherein the first plurality of translation edges are located proximate a perimeter of the lens array.

13. The device of claim 4 , wherein
the second plurality of the translation edges are located proximate a center of the lens array; and
the first plurality of the translation edges are located proximate a perimeter of the lens array along a first side of the lens array.

14. The device of claim 4 , wherein the first angle is substantially greater than zero.

15. The device of claim 4 , wherein the device comprises a video doorbell.

16. The device of claim 4 , wherein the device comprises a radar sensor.

17. The device of claim 4 , wherein the device comprises one or more computer readable media containing computer executable instructions for performing operations comprising:
receiving, at a controller of the device from an integrated circuit of the PIR sensor, a signal; and
based on the signal, powering up a camera of the device.

18. The device of claim 4 , wherein the device comprises one or more computer readable media containing computer executable instructions for performing operations comprising:
initiating recording by a camera of the device based on data generated by the PIR sensor.

19. The device of claim 4 , wherein:
each lens face includes a curved surface; and
each translation edge comprises a flat surface.

20. The device of claim 4 , wherein the first plane is generally perpendicular to the first surface.

21. The device of claim 4 , wherein the first plane extends between opposite lengthwise edges of the second surface.

22. The device of claim 4 , wherein the first plane intersects the first surface or the second surface.

23. A lens array, comprising:
a first surface, and
a second surface including:
lens facets, and
translation edges, each translation edge extending between two lens facets,
wherein, for each respective translation edge of a first plurality of the translation edges, a cross-sectional profile of the respective translation edge of the first plurality of the translation edges is angled at a first angle relative to a first plane, and
wherein, for each respective translation edge of a second plurality of the translation edges, a cross-sectional profile of the respective translation edge of the second plurality of the translation edges is angled at a second angle relative to a second plane, the second angle being less than the first angle, wherein the first plane and the second plane are perpendicular to the first surface.

24. The lens array of claim 23 , wherein the second angle is approximately one degree.

25. The lens array of claim 23 , wherein the first angle is approximately thirty degrees.

26. The lens array of claim 23 , wherein the second plurality of the translation edges are located proximate a center of the lens array.

27. The lens array of claim 23 , wherein the first plurality of the translation edges are located proximate a perimeter of the lens array.

Assignees

• Amazon Tech Inc

Inventors

• Micko Eric S
• Rasmussen Sonny Windstrup

Classifications

• G02B3/005

  arranged along a single direction only, e.g. lenticular sheets (G02B3/0043 takes precedence) · CPC title

• G02B3/0043

  Inhomogeneous or irregular arrays, e.g. varying shape, size, height · CPC title

• G02B3/0037

  characterized by the distribution or form of lenses · CPC title

• G02B3/08 Primary

  with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} · CPC title