# US 12,216,265 B2 · Auto-focus night vision device

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- Number: US 12,216,265 B2
- Document ID: US12216265B2
- Status: Granted
- Kind: B2
- Application number: 18/505,934
- Filed: 2023-11-09
- Published: 2024-10-03
- Granted: 2025-02-04
- Earliest claimed: 2022-11-09
- Assignees: MATBOCK Origins, LLC
- Applicants: MATBOCK Origins, LLC
- Inventors: Sean Matson; Zach Steinbock
- Web page: https://patentgrep.com/patent/US12216265B2

## CPC

- G02B 23/12: with means for image conversion or intensification
- G02B 13/16: for use in conjunction with image converters or intensifiers {, or for use with projectors, e.g. objectives for projection TV}
- G02B 25/001: {Eyepieces}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A night vision device has an objective lens mounted on a housing, and arranged for receiving light from ambient into the housing. An image intensifier and an eyepiece lens are also mounted on the housing. An adjustable iris defining an iris opening is mounted on the housing on an end of the housing generally opposite to where the objective lens is mounted. A sensor for detecting light intensity is connected to the housing and located toward the second end of the housing. The sensor controls the size of an area of the iris opening in response to the light intensity detected for keeping the area of the iris small so as to maintain a depth of field of the night vision device.

## Claims

### Claim 1

A night vision device comprising:
a housing having a first end and a second send;
an objective lens mounted on the housing nearer to a first end than a second end, and arranged for receiving light from ambient into the housing;
an image intensifier mounted on the housing and located toward the second end of the housing from the objective lens;
an eyepiece lens mounted on the housing and located toward the second end of the housing from the image intensifier;
an adjustable iris defining an iris opening, the adjustable iris being mounted on the housing and located toward the second end of the housing from the objective lens;
a sensor for detecting light intensity connected to the housing and located toward the second end of the housing, the sensor being configured to control a size of an area of the iris opening in response to the light intensity detected for keeping the area of the iris small so as to maintain a depth of field of the night vision device.

### Claim 2 (depends on 1)

The night vision device as set forth in claim 1 wherein the sensor is configured to maintain the area of the iris opening so long as the light intensity detected remains in a range between an upper boundary and a lower boundary.

### Claim 3 (depends on 2)

The night vision device as set forth in claim 2 wherein the sensor is configured to cause the area of the iris opening to increase if the light intensity detected is below the lower boundary, and to cause the area of the iris opening to decrease when the light intensity detected is above the upper boundary.

### Claim 4 (depends on 3)

The night vision device as set forth in claim 3 wherein at least one of the upper and lower boundaries is adjustable.

### Claim 5 (depends on 1)

The night vision device as set forth in claim 1 further comprising a power switch operable to turn the night vision device on and off so that the night vision device can operate automatically when turned on or switched off to allow manual operation of both the objective lens focus and the size of the iris opening.

### Claim 6

A method of operating a night vision device comprising measuring at a location proximate the eye of the user the intensity of light reaching the user's eye, using the measured light intensity to maintain a depth of field of the night vision device large so long as the amount of light reaching the user's eye from the night vision device is sufficient to permit visual perception.

### Claim 7 (depends on 6)

The method of operating a night vision device as set forth in claim 6 wherein said step of using the measured light intensity comprises maintaining an adjustable opening of an iris only as large as required to permit visual perception.

### Claim 8 (depends on 7)

The method of operating a night vision device as set forth in claim 7 wherein said step of measuring the intensity of light reaching the user's eye comprises reading the level of light intensity using a sensor positioned in the night vision device proximate to the position at which the user positions the eye for using the night vision device.

### Claim 9 (depends on 8)

The method of operating a night vision device as set forth in claim 8 further comprising adjusting the sensor according to the visual acuity of the user.

### Claim 10 (depends on 6)

The method of operating a night vision device as set forth in claim 6 further comprising intensifying the light received from an objective lens at an input end of the night vision device.

### Claim 11 (depends on 6)

The method of operating a night vision device as set forth in claim 6 wherein measured light intensity can be used to automatically close the iris opening if by opening the iris opening the light intensity measured becomes larger than a maximum amount.