KR-20260068032-A - Lens driving unit, camera module and optical apparatus

KR20260068032AKR 20260068032 AKR20260068032 AKR 20260068032AKR-20260068032-A

Abstract

The present invention relates to a lens driving unit comprising: a first actuator including a first driving unit and a bobbin on which the first driving unit is located; a second actuator including a second driving unit that moves the first driving unit through electromagnetic interaction with the first driving unit and a housing on which the second driving unit is located; a stator including a third driving unit that moves the second driving unit through electromagnetic interaction with the second driving unit; a first magnet located on one side of the bobbin; a sensor unit located in the housing and detecting the position of the first magnet; and a second magnet located on the other side of the bobbin. Through the present invention, a more precise autofocus function can be provided by providing an autofocus feedback function.

Inventors

이준택

Assignees

엘지이노텍 주식회사

Dates

Publication Date: 20260513
Application Date: 20260423

Claims (15)

A cover member including a top plate and a side plate; A bobbin disposed within the above-mentioned cover member; A coil placed on the above bobbin; A driving magnet disposed between the coil and the side plate of the cover member; A first magnet disposed on the above bobbin; and It includes a sensor configured to detect the first magnet, and The side plates of the above cover member include first and second side plates facing each other and third and fourth side plates facing each other, and The above driving magnet includes a first driving magnet disposed between the coil and the first side plate, a second driving magnet disposed between the coil and the third side plate, a third driving magnet disposed between the coil and the second side plate, and a fourth driving magnet disposed between the coil and the fourth side plate. The first driving magnet and the third driving magnet are symmetrically formed in shape and arrangement with respect to the optical axis, and the second driving magnet and the fourth driving magnet are symmetrically formed in shape and arrangement with respect to the optical axis. Each of the first to fourth driving magnets includes an inner surface facing the coil, and The horizontal width of the inner surface of the first driving magnet is smaller than the horizontal width of the inner surface of the second driving magnet, and The horizontal width of the inner surface of the first driving magnet is the length in the second direction perpendicular to the third side plate of the cover member, and The horizontal width of the inner surface of the second driving magnet is the length in the first direction perpendicular to the first side plate of the cover member, and The sensor overlaps with the third driving magnet in the first direction, and The first driving magnet and the third driving magnet are a lens driving device that does not overlap in the first direction.
In paragraph 1, It includes a circuit board disposed on the side plate of the above-mentioned cover member, and The above sensor is a lens driving device placed on the circuit board.
In paragraph 1, The sensor is positioned between the bobbin and the first side plate of the cover member, and The above cover member includes an inner yoke bent from a part of the inner edge of the top plate, and The above bobbin includes a groove formed concavely on its upper surface, and A lens driving device in which at least a portion of the inner yoke is inserted into the groove of the bobbin.
In paragraph 1, The above cover member includes a first corner portion disposed between the first side plate and the third side plate, a second corner portion disposed between the second side plate and the third side plate, a third corner portion disposed between the second side plate and the fourth side plate, and a fourth corner portion disposed between the first side plate and the fourth side plate. The second driving magnet is positioned closer to the first corner portion than to the second corner portion, and The first driving magnet is a lens driving device positioned closer to the first corner portion than to the fourth corner portion.
In paragraph 4, The sensor is a lens driving device positioned closer to the fourth corner than to the first corner.
In paragraph 4, The third driving magnet is positioned closer to the third corner than to the second corner, and The above-mentioned fourth driving magnet is a lens driving device positioned closer to the fourth corner portion than to the third corner portion.
In paragraph 2, It includes an elastic member coupled to the above bobbin, and The above elastic member includes a lower elastic member and an upper elastic member disposed on top of the lower elastic member, and The above lower elastic member includes two lower elastic members spaced apart from each other, and The above coil is a lens driving device electrically connected to the two lower elastic members.
In Paragraph 7, A lens driving device in which power supplied from the outside through the terminal portion of the circuit board is supplied to the coil through the two lower elastic members.
In paragraph 1, A lens driving device comprising a second magnet disposed on the bobbin and positioned symmetrically with respect to the first magnet with respect to the optical axis.
In Paragraph 9, The above bobbin includes a first groove and a second groove spaced apart from the first groove, and The first magnet is placed in the first groove, and The second magnet above is a lens driving device disposed in the second groove.
In paragraph 1, The sensor overlaps with the first magnet in the first direction, and The first magnet is a lens driving device that overlaps with the coil in the first direction.
In paragraph 1, The first magnet is positioned between the coil and the bobbin in the first direction, and The above coil is a lens driving device positioned between the first magnet and the sensor in the above first direction.
In paragraph 1, The above bobbin includes a drive unit coupling portion formed concavely from the outer surface and a first mounting portion formed concavely deeper than the drive unit coupling portion. The above coil is placed in the above drive unit coupling part, and The first magnet is a lens driving device disposed in the first mounting portion.
In paragraph 2, The above circuit board is a lens driving device comprising six terminals disposed on the outer surface.
Printed circuit board; An image sensor disposed on the above printed circuit board; Lens driving device according to claim 1; and A camera module comprising a lens coupled to a bobbin of the lens driving device and positioned at a location corresponding to the image sensor.

Description

Lens driving unit, camera module and optical apparatus The present embodiment relates to a lens driving unit, a camera module, and an optical device. As the distribution of various mobile devices has become widespread and wireless internet services have been commercialized, consumer demands related to mobile devices are also diversifying, leading to the installation of various types of accessory devices on mobile devices. Among them, a representative example is a camera module that captures subjects as photos or videos. Meanwhile, camera modules equipped with autofocus functions are being used recently, and autofocus feedback needs to be used for more precise autofocus control. However, when applying autofocus feedback to a conventional camera module, there is a problem in that the sensing structure for detecting the position of the bobbin affects the attitude of the bobbin, causing static tilt and dynamic tilt. FIG. 1 is a perspective view of a lens driving unit according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of a lens driving unit according to one embodiment of the present invention. FIG. 3 is a plan view illustrating a part of a lens driving unit according to one embodiment of the present invention. FIG. 4 is a plan view of the lens driving unit of FIG. 3 with the housing omitted. Figure 5 is a cross-sectional view taken from L1-L2 of Figure 1. FIG. 6 is a conceptual diagram illustrating a lens driving unit according to one embodiment and a variation of the present invention. Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component. As used below, "PCB" is an abbreviation for Printed Circuit Board and refers to a printed circuit board. Additionally, as used below, "FPCB" is an abbreviation for Flexible Printed Circuit Board and refers to a flexible printed circuit board. Hereinafter, the configuration of an optical device according to one embodiment of the present invention will be described. An optical device according to one embodiment of the present invention may be a mobile phone, smartphone, portable smart device, digital camera, laptop computer, digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), navigation device, etc., but is not limited thereto, and any device for capturing images or photographs is possible. An optical device according to one embodiment of the present invention may include a main body (not shown), a display unit (not shown) disposed on one surface of the main body for displaying information, and a camera (not shown) installed on the main body for capturing images or photographs and having a camera module (not shown). The configuration of the above camera module is described below. The camera module may further include a lens driving unit (10), a lens module (not shown), an infrared blocking filter (not shown), a printed circuit board (not shown), an image sensor (not shown), and a control unit (not shown). The lens module may include one or more lenses (not shown) and a lens barrel that accommodates the one or more lenses. However, the configuration of the lens module is not limited to a lens barrel, and any holder structure capable of supporting one or more lenses is possible. The lens module may be coupled to a lens driving unit (10) and move together with the lens driving unit (10). The lens module may be screw-coupled to the lens driving unit (10) as an example. The lens module may be coupled to the inside of the lens driving unit (10) as an example. Meanwhile, light passing through the lens module may be irradiated onto an image sensor. An infrared blocking filter can block light in the infrared region from being incident on an image sensor. As an example, the infrared blocking filter may be located between a lens module and an image