Self-Aligning Lens Holder and Camera Assembly

Patent metadata

Field	Value
Publication number	US-2019293896-A1
Application number	US-201815934777-A
Country	US
Kind code	A1
Filing date	Mar 23, 2018
Priority date	Mar 23, 2018
Publication date	Sep 26, 2019
Grant date	—

Abstract

A self-aligning lens holder includes elements that register against an image sensor chip to align the holder and lens with the chip. The elements may deflect or deform. A corresponding method aligns the lens holder and a fisheye lens to the image sensor.

First claim

1 . A self-aligning camera assembly comprising:
a circuit board; a solid state image sensor mounted to a circuit board; a lens holder coupled to the circuit board, the lens holder including a base and a shaft, the lens holder base including registration elements that are adapted to register the lens holder relative to the image sensor upon engaging the lens holder with the image sensor, thereby aligning the lens holder with the image sensor; and a lens coupled to the lens holder.

2 . The camera assembly of claim 1 wherein each one of the registration elements engages a corresponding surface of the image sensor and is adapted for deflecting upon engagement with the surface of the image sensor.

3 . The camera assembly of claim 2 wherein the registration elements are at least two registration elements and the lens is a fisheye lens.

4 . The camera assembly of claim 2 wherein each one of the registration elements is an inboard-facing tab, each one of the tabs having a bevel surface that engages a corresponding side of the image sensor.

5 . The camera assembly of 4 wherein the bevel surface is an undercut.

6 . The camera assembly of claim 2 wherein each one of the registration elements is a cantilevered finger.

7 . The camera assembly of claim 6 wherein each one of the fingers is approximately vertical and has a distal, lower portion that engages a corresponding side of the image sensor.

8 . The camera assembly of claim 2 wherein the circuit board has a topside and an underside, the image sensor is a downwardly-facing, underside image sensor mounted on the circuit board topside, and the lens holder is an underside lens holder that is mounted to the circuit board underside, and wherein the camera assembly further comprises an upwardly-facing, a topside image sensor mounted to the circuit board topside and a topside lens holder that is mounted to the circuit board topside about the topside image sensor; wherein the topside lens holder and topside image sensor are offset relative to the underside lens holder and underside image sensor.

9 . The camera assembly of claim 8 wherein the topside lens holder is attached to the circuit board by screws from the circuit board underside and the underside lens holder is attached to the circuit board by screws from the circuit board topside.

10 . A method of assembling a camera to a circuit board, comprising the steps of:
(a) mounting a solid state image sensor to a circuit board; and (b) engaging the image sensor with a lens holder, including contacting the image sensor with registration elements of the lens holder to align the lens holder with the image sensor.

11 . The method of claim 10 wherein the engaging step (b) includes engaging an opposing pair of registration elements against opposing sides of the image sensor, thereby aligning the lens holder to the image sensor.

12 . The method of claim 11 further comprising the step of inserting screws through the circuit board into the lens holder after the engaging step (b) to anchor the lens holder to the circuit board.

13 . The method of claim 11 wherein the registration elements are four inboard-facing, beveled tabs, and wherein the engaging step (b) includes deflecting the tabs against side faces of the image sensor.

14 . The method of claim 11 wherein the registration elements are four cantilevered fingers, and wherein the engaging step (b) includes deflecting distal ends of the cantilevered fingers against side faces of the image sensor.

15 . The method of claim 11 wherein the lens holder holds a fisheye lens, such that the engaging step (b) includes aligning the fisheye lens with the image sensor.

16 . A camera assembly comprising:
a circuit board having at least a pair of though-holes; a solid state image sensor mounted to a circuit board between the through-holes; a lens holder including a base, a shaft extending upwardly from the base, and shoulders proximate the shaft; the lens holder base including registration elements that register the lens holder relative to the image sensor upon engaging the lens holder with the image sensor, thereby aligning the lens holder with the image sensor; a lens mounted in a bore of the shaft of the lens holder; and a spring bracket including:
a pair of opposing, resilient legs located in the through-holes in the circuit board;
v-spring portions extending inwardly from the legs and engaged with the shoulders of the lens holder; and
a top plate extending from the v-spring portions and adapted for transmitting an upward force from the v-spring portions to the lens.

17 . The camera assembly of claim 16 wherein the v-spring portions are (i) a first front v-spring and a first rear v-spring that extend from lateral sides of a first one of the pair of legs and (ii) a second front v-spring and a second rear v-spring that extend from lateral sides of a second one a second one of the pair of legs.

18 . The camera assembly of claim 16 wherein the v-spring portions bias against the shoulders to produce a downward force on the lens holder.

19 . The camera assembly of claim 16 wherein each one of the shoulders includes a slot into which a portion of the v-spring portions extend.

20 . The camera assembly of claim 16 wherein the legs provide an outwardly directed biasing force against the circuit board.

21 . The camera assembly of claim 16 wherein the bore is tapered.

Assignees

• Amazon Tech Inc

Inventors

• Bozkaya Dincer
• Brady Matthew Anthony
• Crow Douglas Scott
• Pajevic Dragan
• Savage Seth A

Classifications

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• H04N23/45

  for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images · CPC title

• H04N23/55 Primary

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G02B7/023 Primary

  permitting adjustment · CPC title