CN102004390B - Lens module detection system and detection method thereof - Google Patents

Abstract

A lens module detection system, the detection system is used to detect the inclination between the lens barrel in the lens module and the movable barrel of the voice coil motor, the detection system includes a light source device and an analysis device. The light source device includes a light source and a position recording device. The light source is used to emit a laser beam, which is irradiated in the gap between the lens barrel and the movable barrel of the voice coil motor. The emitted laser beam is reflected to the position recording device through the outer wall of the lens barrel, and forms a light spot on the recording device. The position recording device records the position of the light spot. The analysis device is used to analyze whether the relative offset distance between the light spot and the position of the light beam emitted by the light source is within the allowable range of error. The lens barrel and the voice coil motor in the lens module use the lens module detection system to detect the inclination angle, so the product quality of the lens module can be improved.

Description

Lens module detection system and detection method thereof

technical field

The invention relates to a lens module detection system and a detection method thereof.

Background technique

In recent years, with the development of optical products, the scope of application of lens modules continues to expand, such as digital cameras, mobile phones with camera functions and other electronic products. For electronic products, especially consumer electronic products, the development trend is light weight and thinner, and the corresponding lens modules are getting smaller and smaller, and the requirements for precision are getting higher and higher, so The assembly process of lens modules also requires higher precision and stability to ensure production efficiency and yield. However, during the assembly process, due to misalignment or product tolerances, after the lens module is screwed into the movable barrel of the voice coil motor, there will be more or less gaps between the lens module and the movable barrel. There is a certain inclination angle, but the size of the inclination angle is difficult to measure with a conventional angle measuring device, and whether the inclination angle is within the allowable error range must be measured before judging. If the inclination angle is too large, the focus of the lens module will be inaccurate, which will affect the product quality. Therefore, how to simply and conveniently realize the inclination detection between the lens module and the voice coil motor has become an urgent problem to be solved in this field.

Contents of the invention

In view of this, it is necessary to provide a detection system capable of detecting lens modules and a detection method thereof.

A lens module detection system, the detection system is used to detect the tilt angle between the lens barrel in the lens module and the movable barrel of the voice coil motor, the detection system includes:

A light source device includes a light source and a position recording device, the light source is used to emit a laser beam, and irradiates the gap between the lens barrel and the movable barrel of the voice coil motor, and the emitted laser beam is reflected by the outer wall of the lens barrel to the A position recording device, and form a light spot on the recording device, the position recording device records the position of the light spot, and simultaneously calculates the distance between the light spot and the position where the light source emits a light beam;

An analysis device is used to analyze whether the relative offset distance between the spot of light and the position of the light beam emitted by the light source is within the allowable range of error.

Compared with the prior art, the lens barrel and the voice coil motor in the lens module use the lens module detection system to detect the inclination angle, so the product quality of the lens module can be improved.

Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a lens module detection system provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of the working state of the lens module detection system in FIG. 1 .

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

Please refer to FIG. 1 , which is a lens module detection system 100 according to an embodiment of the present invention, which is used to detect the tilt angle of the lens module 40 . The lens module 40 includes a voice coil motor 42 and a lens barrel 44 . The lens barrel 44 is sheathed in the movable barrel 420 of the voice coil motor 42 . The lens module inspection system 100 includes a carrying device 10 , a light source device 20 , and an analysis device 30 .

The bearing device 10 includes a bearing base 12 and an actuator 14 for driving the bearing base 12 to rotate. The carrying base 10 defines a quadrangular receiving groove 120 for receiving the lens module 40 to be tested during testing. It can be understood that the shape of the receiving groove 120 is not limited to a square, and it should be determined according to the shape of the lens module to be tested. In this embodiment, the actuator 14 is a rotating motor, which is used to drive the bearing seat 10 to rotate.

Generally, lenses (not shown) are disposed in the lens barrel 44 , so the optical axis of the lens module 40 in this embodiment is the central axis of the lens barrel 44 . The light source device 20 includes a light source 22 , a position recording device 23 and a supporting device 24 . The light source 22 is a laser. The position recording device 23 and the light source 22 are arranged adjacent to each other. The supporting device 24 is used to support the light source 22 and the position recording device 23, so that the light source 22 is located at one end of the lens module 40 and deviates from the optical axis of the lens module 40 by a certain distance, and the light emitted by the light source 22 The light rays are parallel to the central axis of the lens barrel 44 . The position recording device 23 is used to record the position of the light spot of the light emitted by the light source 22 and reflected by the lens module 40 to be inspected and projected on the recording device 23 . In this embodiment, the light beam emitted by the light source 22 just irradiates in the gap between the lens barrel 44 and the movable barrel 420 of the voice coil motor 42 . The position recording device 23 can be a photosensitive element, such as a charge coupled device (Charge Coupled Device, CCD).

The analyzing device 30 is electrically connected to the position recording device 23 via a cable 35 . In this embodiment, the analysis device 30 is a computer.

When in use, the position coordinates corresponding to the light source 22 on the position recording device 23 are set as the reference origin O and recorded in the position recording device 23 . The light source 22 emits a laser beam, and after irradiating the gap between the lens barrel 44 and the movable barrel 420 of the voice coil motor 42, the laser beam is reflected to the position recording device 23 through the outer wall of the lens barrel 44, and is recorded at the position recording device 23. A light spot O1 is formed on the device 23 . The position recording device 23 records the position of the light spot O1, and at the same time calculates the distance between the light spot O1 and the position of the light beam emitted by the light source 22, that is, the reference origin O. An acceptable predetermined range is preset in the analysis device 30. If the relative offset distance between the light spot O1 and the reference origin O is within the acceptable predetermined range, that is, the distance between the lens barrel 44 and the voice coil motor 42 When the inclination angle between them is within an acceptable predetermined range, the analysis device 30 indicates that the lens module 40 to be tested is qualified. When the offset distance between the light spot O1 and the reference origin O is greater than a predetermined value, that is, when the inclination angle between the lens barrel 44 and the voice coil motor 42 exceeds an acceptable predetermined range, the analysis device 30 displays the The lens module 40 is unqualified. It can be understood that the error tolerance range can be set according to customer requirements. In this embodiment, the allowable error range is between 0-0.2 mm.

In order to measure the lens module 40 more accurately, the user can perform multi-point detection. Specifically, the actuator 14 drives the bearing seat 12 so that the lens barrel 44 rotates around the optical axis of the lens module 40, the light source 22 continuously emits a laser beam, and the position recording device 23 records the position of each reflected light spot . The analysis device 30 analyzes whether the relative offset distance between the light spot position farthest from the reference origin O and the reference origin O is within the allowable range of error, and if the error exceeds the allowable range, the analysis device 30 displays the position to be detected. The lens module 40 is unqualified. Otherwise, pass is displayed.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Alterations and variations are within the scope of the claimed invention.

Claims (8)

1. A lens module detection system, the lens module detection system is used to detect the angle of inclination between the lens barrel in the lens module and the movable barrel of the voice coil motor, the lens module detection system includes: A light source device includes a light source and a position recording device, the position coordinates corresponding to the light source on the position recording device are set as the reference origin O and recorded in the position recording device, the light source is used to emit a laser beam, and After irradiating the gap between the lens barrel and the movable barrel of the voice coil motor, the emitted laser beam is reflected to the position recording device through the outer wall of the lens barrel, and forms a light spot O1 on the position recording device. The recording device records the position of the light spot O1, and simultaneously calculates the distance between the light spot O1 and the reference origin O; An analysis device is used to analyze whether the relative offset distance between the light spot O1 and the reference origin O is within an error tolerance range. 2. The lens module inspection system according to claim 1, wherein the light source device further comprises a supporting device for supporting the light source and the position recording device, so that the light source is located at one end of the lens module and The optical axis of the lens module deviates a certain distance, and makes the light emitted by the light source parallel to the central axis of the lens barrel. 3. The lens module inspection system according to claim 1, wherein the position recording device is a photosensitive element. 4. The lens module inspection system according to claim 1, wherein the analyzing device is electrically connected to the position recording device through a cable. 5. The lens module inspection system according to claim 1, further comprising a carrying device, the carrying device includes a bearing base, and the bearing base is provided with a receiving groove, and the receiving groove is used for testing Contains the lens module. 6. The lens module inspection system according to claim 5, wherein the carrying device further comprises an actuator for driving the carrying seat to rotate. 7. The lens module inspection system according to claim 1, wherein a predetermined range is preset in the analysis device, if the relative offset distance between the light spot and the position of the light beam emitted by the light source is within the predetermined range Within the range, the analysis device analyzes the lens module as qualified, otherwise, the lens module is unqualified. 8. The lens module inspection system according to claim 1, wherein the light source and the position recording device are arranged adjacent to each other.

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