CN101586948B - Method for measuring inclination angle of lens module - Google Patents

Abstract

The invention discloses a method for measuring an inclination angle of a lens module, which comprises the following steps: providing a measuring device; providing a standard fixture which comprises a cylinder provided with a reflecting surface capable of reflecting laser; aligning the measuring device to the reflecting surface, emitting laser to the reflecting surface, and regulating relative positions of the standard fixture and the measuring device until a reflection angle of the laser is zero; fixing the lens module onto the standard fixture and making the reflecting surface positioned on aplane reserved for mounting an image sensor in the lens module; providing a horizontal reflecting mirror, and placing the horizontal reflecting mirror on an end face of one end of a lens barrel of th e lens module, wherein the end is far away from the standard fixture; emitting the laser to the reflecting mirror to measure the reflection angle of the laser; and calculating the inclination angle ofthe lens module relative to the plane reserved for mounting the image sensor. The method for measuring the inclination angle of the lens module measures the inclination angle of the lens module relat ive to the plane reserved for mounting the image sensor by a geometric optical means.

Description

Method for Measuring Tilt Angle of Lens Module

technical field

The invention relates to a method for measuring an inclination angle of a lens module.

Background technique

Since the first day of its appearance, digital cameras have been loved by people because they can be directly digitized. The shooting process of digital cameras is to directly convert optical signals into electrical signals through image sensors for digital storage. (Please refer to "ABC of Digital Camera", China Audio-visual Education, 2002, 12.80-82)

However, the camera module manufacturing, maintenance and assembly process is easily affected by component manufacturing and assembly errors, resulting in the phenomenon that the optical axes of the image sensor and the lens module are not perpendicular. This situation will lead to uneven illuminance of the incident light received by the image sensor, resulting in out-of-focus of the imaging corner of the camera module, so that the obtained image will be uneven. Therefore, it is necessary to measure the inclination angle of the lens module relative to the image sensor, so as to provide feedback to the manufacturing parameters of the camera module.

However, when measuring the inclination angle of the lens module relative to the image sensor at present, it is usually to assemble the lens module and the image sensor in the camera module, take an image of a standard pattern, and analyze the The image obtains the inclination angle of the lens module relative to the image sensor. The measurement method is complex and the measurement period is long.

Contents of the invention

In view of this, it is necessary to provide a method for measuring the tilt angle of the lens module with a simple measurement method.

A method for measuring an inclination angle of a lens module. The lens module includes a lens seat and a lens barrel. The lens holder has an accommodating cavity, and the lens barrel is accommodated in the accommodating cavity. The method includes the following steps: providing a measuring device, which can calculate the reflection angle of the reflected laser light by emitting laser light and receiving the reflected laser light; providing a standard jig, the standard jig includes a cylinder , one end face of the cylinder is a reflective surface, and the reflective surface can reflect laser light; align the measuring device with the reflective surface of the standard fixture, emit laser light to the reflective surface, and adjust the standard fixture and measurement The relative position of the device is until the reflection angle of the laser light reflected by the reflective surface is zero; the lens module is fixed on the standard jig, and the reflective surface is located in the lens module to install the image sensor The plane of the device, which is attached to the end of the accommodating cavity of the lens holder away from the lens barrel; a horizontal mirror is provided and placed on the end surface of the lens barrel in the lens module away from the standard fixture ; emit laser light to the reflector and measure the reflection angle of the laser light after passing through the reflector; calculate the inclination angle of the lens module relative to the plane on which the image sensor is scheduled to be installed.

Compared with the prior art, the method for measuring the inclination angle of the lens module provided by the present invention, by providing a standard jig with a reflective surface and a mirror placed on one end surface of the lens barrel, can pass geometric optics The method measures the inclination angle of the lens module relative to the plane of the image sensor to be installed. The measurement method is simple and the measurement cycle is short.

Description of drawings

FIG. 1 is a schematic diagram of a method for measuring a tilt angle of a lens module according to an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of the tilt angle measurement method of the lens module provided by the embodiment of the present invention when measuring the tilt angle of a standard jig.

FIG. 3 is a schematic structural diagram of the method for measuring the inclination angle of the lens module provided in the embodiment of the present invention when measuring the inclination angle of the lens barrel.

FIG. 4 is a flow chart of a method for measuring an inclination angle of a lens module provided in an embodiment of the present invention.

Detailed ways

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

Please refer to Fig. 1, the method for measuring the inclination angle of the lens module provided by the embodiment of the present invention mainly applies the principle of optical reflection, and by measuring the reflection angles of the laser light passing through two planes respectively, the angle between the two planes can be obtained. Tilt angle. It can be understood that if the reflection angle of one of the planes is zero degrees and the reflection angle of the other plane is θ, then the inclination angle of the two planes is also θ.

Referring to Fig. 2, Fig. 3 and Fig. 4, the lens module 10 to be tested includes a lens mount 11 and a lens barrel 12, the lens mount 11 has an accommodating cavity 111, and the lens barrel 12 is housed in the accommodating cavity 111 . The method for measuring the inclination angle of the lens module comprises the following steps:

In step S202, a measuring device 20 is provided, and the measuring device 20 can calculate the reflection angle of the reflected laser light by emitting the laser light and receiving the reflected laser light.

In step S204 , a standard jig 30 is provided, and the standard jig 30 includes a cylinder 31 and a carrier 32 . One end surface of the cylinder 31 is a reflective surface 311 , and the carrying platform 32 extends from an end of the cylinder 31 away from the reflective surface 311 . The reflective surface 311 can reflect laser light. The reflective surface 311 may be a mirror-finished plane. It is also possible to fix a reflecting mirror at one end of the cylinder 31 , and the reflecting surface 311 of the standard jig 30 is the mirror surface of the reflecting mirror.

Step S206 , align the measuring device 20 with the reflective surface 311 of the standard jig 30 . Laser light is emitted to the reflective surface 311 , and the relative position of the standard jig 30 and the measuring device 20 is adjusted until the reflection angle of the laser light reflected by the reflective surface 311 is zero degrees. It can be understood that if the inclination angle of the lens module 10 needs to be measured in batches, the adjusted measuring device 20 and the standard fixture 30 can be fixed in position, and the reflective surface 311 can be regarded as a standard surface.

Step S208, fixing the lens module 10 on the standard jig 30, and making the reflective surface 311 located in the plane of the lens module 10 where the image sensor is scheduled to be installed, and the plane is attached to the lens The accommodating cavity 111 of the seat 11 is far from the end of the lens barrel 12 .

Step S210 , providing a horizontal mirror 40 and placing it on the end surface of the lens barrel 12 in the lens module 10 away from the standard jig 30 .

Step S212 , emitting laser light to the reflective mirror 40 to measure the reflection angle θ of the laser light passing through the reflective mirror 40 .

Step S214 , calculating the inclination angle β of the lens module 10 relative to the plane on which the image sensor is intended to be installed. In this embodiment, the reflection angle θ is equal to the inclination angle β.

In the method for measuring the tilt angle of the lens module, the step S204 may be before the step S202.

Compared with the prior art, the method for measuring the inclination angle of the lens module provided by the present invention, by providing a standard jig with a reflective surface and a mirror placed on one end surface of the lens barrel, can pass geometric optics The method measures the inclination angle of the lens module relative to the plane of the image sensor to be installed. The measurement method is simple and the measurement cycle is short.

It can be understood that those skilled in the art can make various other corresponding changes and deformations according to the technical concept of the present invention, and all these changes and deformations should belong to the protection scope of the claims of the present invention.

Claims (4)

1. the method for measuring inclination angle of a camera lens module, said camera lens module comprises a lens mount and a lens barrel, and said lens mount has a containing cavity, and said lens barrel is placed in this containing cavity, it is characterized in that, and this method comprises the steps:

One measurement mechanism is provided, and said measurement mechanism can calculate the reflection angle of the laser that is reflected through the be reflected laser of returning of emission laser and reception;

A standard tool is provided, and said standard tool comprises a right cylinder, and a said cylindrical end face is a reflecting surface, and said reflecting surface can reflector laser;

Make the reflecting surface of said measurement mechanism alignment criteria tool, to said reflection surface-emission laser, the relative position of adjusting said standard tool and measurement mechanism is till the reflection angle of said reflecting surface laser light reflected is zero degree;

Said camera lens module is fixed on the said standard tool, and makes said reflecting surface be positioned at the predetermined plane that image sensor is installed of camera lens module, this plane is fitted in the end of the containing cavity of said lens mount away from lens barrel;

One horizontal reflection mirror is provided and places it on the end face of lens barrel in the said camera lens module away from standard tool one end;

Measure the reflection angle of said laser after to said catoptron emission Laser Measuring via this catoptron;

Calculate the predetermined relatively pitch angle that the plane of image sensor is installed of camera lens module.

2. the method for measuring inclination angle of camera lens module as claimed in claim 1 is characterized in that, said reflecting surface is the plane through mirror finish.

3. the method for measuring inclination angle of camera lens module as claimed in claim 1 is characterized in that, an end of said standard tool is fixed with a catoptron, and the reflecting surface of said standard tool is the minute surface of this catoptron.

4. the method for measuring inclination angle of camera lens module as claimed in claim 1 is characterized in that, said standard tool also comprises the plummer that extends out away from an end of reflecting surface from said right cylinder.

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