CN100437333C - Lens module and electronic device thereof - Google Patents

Abstract

A lens module at least comprises a driving device, a rotating element and a lens device. The rotating element has a contact portion including a continuous curved surface and rotated by the driving device. The lens device has a lens and a guiding part, the guiding part is coupled and contacted with the contact part, and the lens moves along with the guiding part. The driving device drives the rotation element to rotate, and the lens device generates displacement along with the rotation of the rotation element through the guide part so as to perform focusing action.

Description

A kind of lens module and its electronic device

【Technical field】

The present invention relates to a lens module, and in particular to a lens module driven by a motor.

【Prior technology】

With the advancement of electronic technology, some electronic devices have replaced analog circuits with digital circuits. Among these electronic devices using digital circuits, a camera is a newly developed technological product. Compared with the manual focus method of some traditional cameras, the digital camera device is equipped with an automatic focus function.

The basic structure of a common lens module is a motor, a worm gear mechanism, a rotating element, a lens device, an image sensor and a photo interrupter sensor, wherein the motor and the worm gear mechanism are used to drive the lens device, and The photointerrupter is used to define the focus reference point.

Referring to FIG. 1A , FIG. 1A is a schematic plan view of a conventional lens module. The motor 100 drives the worm gear mechanism 120 to rotate, and the rotating element 122 connected with the worm gear mechanism 120 is also driven to rotate. The lens device 130 has an extension 132 that contacts the rotating element 122, so that the lens device 130 follows the movement of the rotating element 122. Rotate to generate movement for focusing action.

The lens device 130 also has a blocking portion 134 . When the light in the photointerrupter 150 is blocked by the blocking part 134, a reference point is set up as the starting point of autofocus, and a control system is used to make the lens device 130 start from the starting point and make a predetermined stroke on the surface of the rotating element 122. The image is searched and then analyzed by the image sensor 140 to achieve the purpose of focusing.

However, it is necessary to use the auto-focusing method of the photo-interrupter, so that the installation of the photo-interrupter must be considered in product design, and it is inevitable to consume additional power, and the isolation between the photo-interrupter and the sensor must be considered to avoid the photo-interrupter. The infrared rays interfere with the image sensor and cause flare.

In addition, referring to FIG. 1B , it shows a schematic diagram of the rotating element in the existing lens module. Since the existing rotating element has a one-stage differential structure 190, if the lens is damaged due to improper use or unstable signal of the overall device, or other abnormal conditions of the device When the device is positioned, the extension part crosses the level difference position, that is, exceeds the highest edge of the rotating element and suddenly falls to a lower position, which will cause damage to the lens device.

Therefore, an improved design is needed to allow the lens module to save space, power consumption and reduce image interference, so as to solve the above-mentioned difficulties encountered in the prior art.

【Content of invention】

The purpose of the present invention is to provide a lens module to eliminate the possibility of damage to the lens due to the level difference structure of the rotating element.

According to the above purpose of the present invention, a lens module is proposed. The lens module mainly includes a driving device, a rotating element, and a lens device. The rotating element has a contact portion, and the contact portion is a continuous curved surface, so that the rotating element presents a continuous structure without step difference in the circumferential direction, and is rotated by the driving device. The lens device has a lens and a guide part, the lens moves with the guide part, the guide part is coupled with the contact part, and the lens device moves with the continuous curved surface. The driving device, for example, uses a motor and a transmission part. The motor is connected to the transmission part to drive the transmission part to rotate, thereby driving the rotation of the entire transmission part and the rotating element. The displacement action that causes the mechanism to focus.

According to a preferred embodiment of the present invention, a worm and worm gear set is used in conjunction with the transmission part and the rotating element. When the system performs focusing action, the motor runs and drives the rotation of the worm, and the rotating element also rotates synchronously. Since the guide part is in contact with the wheel rotating element, the contact position changes with the rotation of the rotating element, and the entire lens device is also displaced at the same time to search for the analytical value. Moreover, the guide part and the rotating element can rotate a full circle without hindrance, that is, the search action of the analytical value allows the lens device to start at any position, which is different from the prior art that needs to find a common point in advance before proceeding. focus.

The lens module of the present invention adopts a continuous and non-step-difference rotating element structure, and uses the rotation of the motor to cause the lens device to generate a displacement action. Moreover, the rotation system can be in any direction and continuously, which avoids the existing design limitation, which requires positioning and searching for a starting point at the beginning of each focusing action. It also provides a safe design to prevent the lens from moving over the step difference of the rotating element if the device is abnormal during focusing, resulting in damage to the lens device.

The removal of the photo-interrupter in the lens module ensures that the operation of the image sensor will not be interfered by infrared rays, and saves space configuration, installation cost of the photo-interrupter, and power consumption. The present invention is applied to an electronic device such as a camera, and has the advantages of safe operation and low cost.

【Description of drawings】

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the detailed description of the accompanying drawings is as follows:

FIG. 1A is a schematic plan view of a conventional lens module.

FIG. 1B is a schematic diagram illustrating a rotating element in a conventional lens module.

FIG. 2A is a schematic plan view of a preferred embodiment of the lens module according to the present invention.

FIG. 2B is a schematic diagram of a rotating element according to a preferred embodiment of the present invention.

FIG. 3A is a perspective view of a preferred embodiment of the lens module according to the present invention.

FIG. 3B is a schematic diagram illustrating the meshing of the teeth in FIG. 3A .

【Detailed ways】

The lens module of the present invention achieves the purpose of auto-focusing through the rotating element, and does not need additionally installing a photo-interrupter. The following will clearly illustrate the spirit of the present invention with drawings and detailed descriptions. After those skilled in the art understand the preferred embodiments of the present invention, they can be changed and modified by the technology taught in the present invention without departing from it. scope of the invention.

Referring to FIGS. 2A and 3A , they respectively show a plan view and a perspective view of a preferred embodiment of the lens module according to the present invention. The lens module mainly includes a driving device 270 , a rotating element 222 , and a lens device 230 . The rotating element 222 is rotated by the driving device 270, and its top surface has a contact portion 222a, which includes a continuous curved surface. The lens device 230 has a lens 234 and a guide part 232 , the lens 234 moves with the guide part 232 , and the guide part 232 is in contact with the contact part 222 a. The lens device 230 moves with the rotation of the contact part 222a through the guide part 232 to perform a displacement action of focusing.

In a preferred embodiment, the lens module is mounted on a mobile phone or a camera, and the driving device 270 includes at least a motor 200 and a transmission part 220. The motor 200 is connected to the transmission part 220 to drive the transmission part 220 to rotate and drive the entire For the rotation of the transmission part 220 and the rotation element 222 , the motor 200 uses a servo motor to control the rotation speed.

At least a part of the transmission part 220 has a plurality of tooth lines 220a. The cooperation between the transmission part 220 and the rotating element 222 can use a transmission gear set, such as a worm gear set, that is, the transmission part 220 is a worm with a plurality of tooth lines 220a, and the rotating element 222 is a worm wheel with a plurality of corresponding tooth lines. The contact portion 222a is an annular slope with a continuous curvature of 360 degrees.

The motor 200 is connected to the transmission part 220, and the transmission part 220 engages with the rotating element 222 through the teeth 220a for transmission. When the system performs focusing action, the motor 200 runs and drives the transmission part 220 to rotate, and then drives the rotating element 222 engaged with the transmission part 220 to rotate synchronously.

The guide part 232 on the lens device 230 is in contact with the contact part 222a of the rotating element 222, and changes the contact position with the rotation of the rotating element 222, and the entire lens device 230 also produces a displacement in one direction at the same time, as shown in the first direction shown in the figure. Arrow with displacement 260a. Changing the rotation direction of the motor 200 results in a displacement in the opposite direction, as shown by the arrow of the second direction displacement 260b. And an image sensor 240 receives the optical signal passing through the lens device 230 to search for the resolution value. When the maximum resolution value is compared, the motor 200 is controlled to stop rotating, so as to achieve the purpose of focusing.

Since the rotating element 222 has no step difference and has a continuous curved surface structure, the guiding part 232 and the rotating element 222 can rotate a full circle without hindrance, or even keep in contact with multiple turns. By controlling the rotation direction of the motor 200, the rotation element 222 can also change the rotation direction at any time, and rotate in a reverse direction to search for the analytical value in the reverse direction. And when it stops at any position, it will directly use any direction as the initial search direction for the next start-up to search for the analytical value, without the need to find a predetermined search starting point for positioning.

Referring to FIG. 2B , it shows a schematic diagram of a rotating element according to a preferred embodiment of the present invention. As shown in the figure, the rotating element 222 is a continuous structure without step difference, and the contact portion 222a has a continuous curved surface. In this embodiment, preferably, the rotating element 222 is a symmetrical structure, so that the analysis value searching action is faster.

FIG. 3B is a schematic diagram illustrating the meshing of the teeth in FIG. 3A . The figure clearly shows the meshing situation of the teeth grooves 220 a of the transmission part 220 and the teeth grooves of the rotating element 222 in this example.

It can be known from the above preferred embodiments of the present invention that the application of the present invention has the following advantages. Through the continuous curved surface design of the rotating element, the lens module can search for the analytical value of the whole stroke. The lens device can start the search action of the analytical value at any position, and there is no necessary positioning step, thus eliminating the need for a positioning device, such as a photointerrupter, not only saving considerable space in the entire module, but also The installation cost of this positioning device is eliminated.

Especially in the automatic focusing process, the power consumption of the positioning device is reduced, which is an advantage that cannot be ignored for the application of small electronic equipment. Therefore, there is no photo-interrupter to generate infrared rays, causing interference to the image sensor. The feature of full-stroke movement also eliminates the possibility of damage caused by the sudden drop of the step structure when the lens device passes over the highest point of the rotating element, which is hidden in the prior art.

The above description only represents a preferred embodiment. The present invention is not limited to the use of the above-mentioned transmission part, and other forms of transmission combinations can also be used. Any effective transmission mechanism can be used in the lens module of the present invention. without departing from the spirit and scope of the present invention.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore The scope of protection of the present invention should be defined by the scope of the appended patent application.

Claims (8)

1. camera lens module comprises at least:

One drive unit;

One rotating element rotates by this drive unit, and an end face of this rotating element is continuous and 360 annular slopes of spending of a curvature, and this end face rotates with this drive unit; And

One lens assembly has a camera lens and a guidance part, and this camera lens moves with this guidance part, and this guidance part contacts with this end face, and this lens assembly moves with the rotation of this end face.

2. camera lens module according to claim 1 is characterized in that, this drive unit comprises a motor and a driving section at least, it is characterized in that, this driving section is with this revolution, and this driving section drives this rotating element rotation.

3. camera lens module according to claim 2 is characterized in that this driving section is connected in this motor, and at least one part of this driving section has a plurality of grooves, is meshed with this rotating element.

4. camera lens module according to claim 2 is characterized in that, this driving section is a worm screw, and this rotating element is a worm gear.

5. electronic installation comprises at least:

One drive unit;

One rotating element rotates this rotating element by this drive unit, and an end face of this rotating element is continuous and 360 annular slopes of spending of a curvature, and this end face rotates with this drive unit; And

One lens assembly has a camera lens and a guidance part, and this camera lens moves with this guidance part, and this guidance part contacts with this end face, and this guidance part moves with the rotation of this end face; And

One image sensor, in order to the light signal of reception by this lens assembly,

Wherein this lens assembly rotates with one of this rotating element by this guidance part and produces a displacement, makes this image sensor receive this light signal.

6. electronic installation according to claim 5 is characterized in that, this drive unit comprises a motor and a driving section at least, and wherein this driving section is with this revolution, and this driving section drives this rotating element and rotates.

7. electronic installation according to claim 6 is characterized in that this driving section is connected in this motor, and at least one part of this driving section has a plurality of grooves, is meshed with this rotating element.

8. electronic installation according to claim 6 is characterized in that, this driving section is a worm screw, and this rotating element is a worm gear.

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