CN-122018109-A - Optical zoom camera module and corresponding portable terminal equipment

Abstract

The invention discloses an optical zoom module, which comprises a module shell, a plurality of lens groups, a plurality of carriers and a second track, wherein the lens groups are coaxially arranged along an axis, one lens group is installed in each carrier, at least two carriers in the plurality of carriers are movable carriers, the optical zoom module is arranged in the module shell, the upper surface of the second track and the lower surface of the movable carrier are supported by balls, the second track is provided with a magnetic conductive material, and a second magnet is installed on the movable carrier, so that the balls are clamped by magnetic force between the second magnet and the second track.

Inventors

• YUAN DONGLI
• WU ZHIHAN
• WANG HAITAO
• ZHOU ZHOU
• He Yanning
• YU WENKE
• QIU CHEN

Assignees

• 宁波舜宇光电信息有限公司

Dates

Publication Date

20260512

Application Date

20211206

Priority Date

20201218

Claims (18)

1. 1. An optical zoom module, comprising: The photosensitive assembly comprises a circuit board and a photosensitive chip arranged on the circuit board; A module housing; A plurality of lens groups coaxially arranged along an axis; a plurality of carriers, wherein each carrier is internally provided with one lens group, and at least two carriers in the plurality of carriers are movable carriers; A second rail disposed in the module case, the second rail being supported between an upper surface of the second rail and a lower surface of the movable carrier by balls, the second rail having a magnetically conductive material; The movable carrier is provided with a second magnet, so that the magnetic force between the second magnet and the second track clamps the balls.
2. 2. An optical zoom module according to claim 1, wherein the second rail is an elongated metal sheet, and the upper surface of the metal sheet and the lower surface of the movable carrier are supported by the balls therebetween.
3. 3. An optical zoom module according to claim 2, wherein the bottom surface of the movable carrier is provided with a recess opening downwards, the ball being received in the recess, the ball being clamped between the recess and the second rail.
4. 4. An optical zoom module according to claim 3, wherein the second magnet is mounted above the recess of the movable carrier, the second magnet being located directly above the balls.
5. 5. An optical zoom module according to claim 2, wherein the bottom surface of the movable carrier is provided with a recess opening downwards, said recess together with the metal sheet forming a receiving structure for receiving the ball.
6. 6. An optical zoom module according to any one of claims 2-5, wherein the second track is a unitary sheet metal, each movable carrier corresponding to a different section of the sheet metal.
7. 7. An optical zoom module according to any one of claims 2-5, wherein the second track segments are arranged, each second track segment corresponding to a movable carrier.
8. 8. The optical zoom module according to any one of claims 2-5, wherein the plurality of carriers comprises a fixed carrier and two movable carriers, wherein a fixed lens group is installed in the fixed carrier, and a zoom lens group and a compensation lens group are installed in the two movable carriers respectively, wherein the zoom lens group is suitable for adjusting the focal length of the whole imaging system, and the compensation lens group is used for focusing the imaging system so as to compensate the focus offset caused by the movement of the zoom lens group.
9. 9. The optical zoom module of claim 8, wherein the fixed lens group, the zoom lens group, and the compensation lens group are arranged in order from an object side to an image side.
10. 10. The optical zoom module of claim 9, wherein the side of the circuit board has a flexible connecting strap that is bent to either the first side or the second side of the module housing.
11. 11. The optical zoom module according to claim 1, wherein the movable carrier is driven by a magnet coil.
12. 12. The optical zoom module of claim 11, wherein the module housing comprises a housing bottom plate, a housing side wall, and a cover, wherein the magnet is disposed on an inner side of the housing side wall, and the coil is disposed on an outer side of the movable carrier.
13. 13. An optical zoom module according to claim 12, wherein the end face of the first slide mount of the movable carrier and/or the end face of the limit structure of the housing side wall is provided with a buffer layer.
14. 14. The optical zoom module of claim 1, further comprising a light turning element adapted to reflect incident light from an incident channel to an imaging channel, an optical center of the incident channel forming an incident optical axis, and an optical center of the imaging channel forming the primary optical axis, the incident optical axis being perpendicular to the primary optical axis.
15. 15. The optical zoom module of claim 1, wherein the movable carrier comprises a first slide mount on the first side, a second slide on the second side, and a carrier base plate connecting the first slide mount and the second slide, the first slide mount, the second slide, and the base plate forming a U-shaped channel, the mirror assembly being mounted in the U-shaped channel.
16. 16. The optical zoom module of claim 15, wherein the lens group is assembled by a lens barrel, an outer side of the lens barrel being fixed to an inner side of the U-shaped groove.
17. 17. The optical zoom module of claim 16, wherein the carrier base plate and the housing base plate have a spacing therebetween.
18. 18. A portable terminal device, characterized by comprising: the optical zoom module of any one of claims 1-17.

Description

Optical zoom camera module and corresponding portable terminal equipment RELATED APPLICATIONS The present application claims priority from chinese patent application No. 20201111089555. X, filed on 18 months in 2020, and chinese patent application No. 2020111103973. X, filed on 18 months in 2020, and from optical zoom camera module and corresponding portable terminal device, filed on 18 months in 2020, and incorporated herein by reference in its entirety. Technical Field The invention relates to the technical field of camera modules, in particular to an optical zoom camera module. Background Along with the rise of living standard, the requirements of consumers on the camera shooting function of terminal equipment such as mobile phones, tablets and the like are higher and higher, the effects of background blurring, night shooting and the like are required to be realized, the requirements are also put forward on tele-shooting, and the consumers need the terminal equipment capable of clearly shooting far pictures. The optical zoom is an imaging module for realizing zoom shooting. The optical zoom is to change the focal length of the lens by changing the distance between the optical lenses of the lens so as to achieve the purpose of zooming, so that the object at a far distance can be photographed more clearly, and the imaging quality of the formed image is relatively high. Zoom here refers to changing the focal length so as to take scenes of different distances. Further, periscope modules are often used in terminal devices such as mobile phones at present to meet the requirement of tele, and how to enable periscope modules to have optical zoom capability in a limited space of the mobile phones is a great difficulty currently faced. The optical zoom camera module typically comprises at least two slidable lens carriers for moving the zoom lens group and the compensation lens group, respectively. The zoom lens group moves along the optical axis, so that the focal length of the whole imaging system can be adjusted. The compensation lens group also moves along the optical axis direction of the compensation lens group, so that the focusing function of the camera module is realized, and the focus offset caused by the movement of the zoom lens group is compensated, so that the imaging quality of the module is improved. To achieve the above-mentioned movement, one idea in the prior art is to provide a guide groove on the module housing, on which two (or more) lens carriers are fitted by means of balls and corresponding bearings, so that the zoom lens group and the compensation lens group can be moved along the optical axis along the guide groove. However, for an optical zoom module, especially an optical zoom module having a length Jiao Jiaoduan, the movement stroke of the lens carrier tends to be long, and the machining precision of the guide groove (especially the machining precision of the mass-produced product) manufactured in the module housing (or other similar fixing portion) is limited, and the manufacturing tolerance of the guide groove itself may cause insufficient collimation of the movement stroke of the two (or more) lens carriers, thereby causing degradation of the imaging quality of the module. To solve the above-mentioned problems, a solution for realizing the alignment sliding of a plurality of lens carriers based on the double guide bar guidance is proposed in the prior art. In such a solution, two parallel guide rods are usually mounted on two sides of the optical zoom module, two lens carriers are each mounted on two guide rods located on two sides, and each linear guide rod passes through the two lens carriers. Thus, during zooming, both lens carriers can slide along the guide rods. More specifically, a plurality of carriers provided with a lens structure are sequentially arranged from an object side surface to an image side surface, and in the shooting process, the carriers are driven to move so as to realize continuous zooming in the shooting process, and the imaging quality of the module is effectively improved. It should be noted that in this type of solution, more guide rods may be provided, and the above description is given by taking one guide rod on each side as an example. For example, patent application CN201980011002.1 discloses a camera module comprising a base, a plurality of guide bars coupled to the base, a first mover disposed in the base, the first mover including at least one lens disposed therein, and a second mover disposed in the base, the second mover including at least one lens disposed therein, wherein each of the first mover and the second mover includes a plurality of guide grooves formed therein to allow the guide bars to be disposed in the guide grooves, wherein each of the plurality of guide grooves includes a protruding portion formed to be in contact with a corresponding one of the guide bars. The first mover may correspond to the aforementioned one lens carrier (in w