# US 12,761,114 B2 · Lens loosening test system and lens loosening test method

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- Number: US 12,761,114 B2
- Document ID: US12761114B2
- Status: Granted
- Kind: B2
- Application number: 18/404,796
- Filed: 2024-01-04
- Published: 2024-10-10
- Granted: 2026-10-13
- Earliest claimed: 2023-04-10
- Assignees: AAG Optics (Suzhou) Co., Ltd.
- Applicants: AAC Optics (Suzhou) Co., Ltd.
- Inventors: Dasong Ge; Lei Zhao; Haopeng Zhou; Nan Qiao; Shaoshi Shen; Tianjia Liang
- Web page: https://patentgrep.com/patent/US12761114B2

## CPC

- G01M 11/081: {by using a contact-less detection method, i.e. with a camera}
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

## Abstract

The lens loosening test system includes a processing module, an acquisition module, a speaker, a microphone, and a fixing module. The fixing module is configured to place and fix the lens to be tested. The processing module is configured to send an excitation signal to the acquisition module. The acquisition module is configured to excite the speaker based on the excitation signal. The speaker is configured to generate vibration to drive the lens to be tested to vibrate and generate an audio signal. The microphone is configured to receive and transmit the audio signal to the acquisition module. The acquisition module is further configured to output the audio signal to the processing module. The processing module is further configured to determine whether the lens to be tested is loose or not based on the audio signal. The present application can accurately detect whether the lens is loose or not.

## Claims

### Claim 1

A lens loosening test system configured to detect whether a lens to be tested is loose or not, comprising a processing module, an acquisition module connected to the processing module, a speaker and a microphone connected to the acquisition module, and a fixing module installed on the speaker;
wherein the fixing module is configured to place and fix the lens to be tested;
the processing module is configured to send an excitation signal to the acquisition module;
the acquisition module is configured to excite the speaker based on the excitation signal;
the speaker is configured to generate vibration to drive the lens to be tested fixed on the fixing module to vibrate and generate an audio signal;
the microphone is configured to receive the audio signal and transmit the audio signal to the acquisition module;
the acquisition module is further configured to output the audio signal to the processing module; and
the processing module is further configured to determine whether the lens to be tested is loose or not based on the audio signal;
wherein the fixing module comprises a base fixed on a vibration plate of the speaker and a fixing member arranged on the base, and the fixing member is configured to fix the lens to be tested; and
a side of the base away from the speaker has a mounting surface that is partially recessed to inwardly form a groove for accommodating the lens to be tested, each of side walls of the groove is defined with a plurality of through holes, the fixing member is a fixing screw, and the fixing screw is threaded with each of the plurality of through holes: a side of the base facing the speaker has a bottom surface that is secured to the speaker, and the mounting surface is angled relative to the bottom surface so that the lens to be tested is installed at a tilt within the groove.

### Claim 2 (depends on 1)

The lens loosening test system according to claim 1, further comprising a sound insulation module, wherein a sound insulation detection environment is formed inside the sound insulation module, and the speaker, the fixing module, and the microphone are arranged inside the sound insulation module.

### Claim 3 (depends on 1)

The lens loosening test system according to claim 1, further comprising a power amplifier arranged between the acquisition module and the speaker, wherein the power amplifier is configured to amplify the excitation signal.

### Claim 4 (depends on 1)

The lens loosening test system according to claim 1, further comprising a preamplifier arranged between the microphone and the acquisition module, wherein the preamplifier is configured to amplify the audio signal received by the microphone.

### Claim 5 (depends on 1)

A lens loosening test method, wherein a lens to be tested is tested using a lens loosening test system according to claim 1, and the lens loosening test method comprising:
fixing the lens to be tested on a fixing module;
sending, by a processing module, an excitation signal to an acquisition module;
exciting, by the acquisition module, a speaker based on the excitation signal;
generating, by the speaker, vibration to drive the lens to be tested fixed on the fixing module to vibrate and generate an audio signal;
receiving, by the microphone, the audio signal, and transmitting, by the microphone, the audio signal to the acquisition module;
outputting, by the acquisition module, the audio signal to the processing module; and
determining, by the processing module, whether the lens to be tested is loose or not based on the audio signal.

### Claim 6 (depends on 2)

A lens loosening test method, wherein a lens to be tested is tested using a lens loosening test system according to claim 2, and the lens loosening test method comprising:
fixing the lens to be tested on a fixing module;
sending, by a processing module, an excitation signal to an acquisition module;
exciting, by the acquisition module, a speaker based on the excitation signal;
generating, by the speaker, vibration to drive the lens to be tested fixed on the fixing module to vibrate and generate an audio signal;
receiving, by the microphone, the audio signal, and transmitting, by the microphone, the audio signal to the acquisition module;
outputting, by the acquisition module, the audio signal to the processing module; and
determining, by the processing module, whether the lens to be tested is loose or not based on the audio signal.

### Claim 7 (depends on 3)

A lens loosening test method, wherein a lens to be tested is tested using a lens loosening test system according to claim 3, and the lens loosening test method comprising:
fixing the lens to be tested on a fixing module;
sending, by a processing module, an excitation signal to an acquisition module;
exciting, by the acquisition module, a speaker based on the excitation signal;
generating, by the speaker, vibration to drive the lens to be tested fixed on the fixing module to vibrate and generate an audio signal;
receiving, by the microphone, the audio signal, and transmitting, by the microphone, the audio signal to the acquisition module;
outputting, by the acquisition module, the audio signal to the processing module; and
determining, by the processing module, whether the lens to be tested is loose or not based on the audio signal.

### Claim 8 (depends on 4)

A lens loosening test method, wherein a lens to be tested is tested using a lens loosening test system according to claim 4, and the lens loosening test method comprising:
fixing the lens to be tested on a fixing module;
sending, by a processing module, an excitation signal to an acquisition module;
exciting, by the acquisition module, a speaker based on the excitation signal;
generating, by the speaker, vibration to drive the lens to be tested fixed on the fixing module to vibrate and generate an audio signal;
receiving, by the microphone, the audio signal, and transmitting, by the microphone, the audio signal to the acquisition module;
outputting, by the acquisition module, the audio signal to the processing module; and
determining, by the processing module, whether the lens to be tested is loose or not based on the audio signal.

### Claim 9 (depends on 5)

The lens loosening test method according to claim 5, wherein determining, by the processing module, whether the lens to be tested is loose or not based on the audio signal comprises:
processing, by the processing module, the audio signal to obtain a proportion of higher-order harmonics;
obtaining an excitation frequency of the excitation signal;
drawing an audio signal curve based on the proportion of higher-order harmonics and the excitation frequency;
determining whether a proportion of a part of higher-order harmonics within a preset excitation frequency range is greater than a preset threshold or not based on the audio signal curve; and
in response to the proportion of the part of higher-order harmonics within the preset excitation frequency range is greater than the preset threshold, determining that the lens to be tested is loose.

### Claim 10 (depends on 9)

The lens loosening test method according to claim 9, further comprising:
testing, by the lens loosening test system, a plurality of lenses that are not loose;
drawing a standard curve based on the proportion of higher-order harmonics and the excitation frequency obtained from the plurality of lenses that are not loose; and
obtaining the preset excitation frequency range and the preset threshold based on the standard curve.