KR102156119B1 - Camera Module - Google Patents

Abstract

A camera module according to a first embodiment of the present invention includes a printed circuit board on which an image sensor is mounted; A lens holder installed on the upper side of the printed circuit board to form an optical path; A first actuator disposed above the lens holder to perform a camera shake correction function by moving one outermost lens; And a second actuator that performs an auto-focusing function by moving the lens holder.

Description

Camera Module

The present invention relates to a camera module.

Camera modules for ultra-compact and low power consumption are difficult to apply technologies such as VCM, which have been used in conventional camera modules, and related research has been actively conducted.

In the case of a camera module mounted on a small electronic product, the camera module may be frequently impacted during use, and the camera module may be slightly shaken due to the user's hand shake during shooting. In view of this point, in recent years, development of a camera module in which a means for preventing hand shake is additionally installed on the camera module is required.

An object of the present invention is to provide a camera module having an auto focusing function and a camera shake correction function.

A camera module according to a first embodiment of the present invention includes a printed circuit board on which an image sensor is mounted; A lens holder installed on the upper side of the printed circuit board to form an optical path; A first actuator disposed above the lens holder to perform a camera shake correction function by moving one outermost lens; And a second actuator that performs an auto-focusing function by moving the lens holder.

A camera module according to a second embodiment of the present invention includes a printed circuit board on which an image sensor is mounted; A lens holder installed on the upper side of the printed circuit board to form an optical path; A first actuator disposed below the lens holder to perform a camera shake correction function by moving one last lens; And a second actuator that performs an auto-focusing function by moving the lens holder.

In the first and second embodiments, it is preferable that the lens holder is installed inside the camera housing, and the second actuator moves the lens holder and the first actuator as a whole.

In addition, the first actuator may be provided as a single lens moving actuator.

In this case, the second actuator may include a plurality of magnets installed on the outer circumferential surface of the camera unit; And a plurality of coils installed on an inner surface of the camera housing facing the magnet; or a plurality of coils installed on an outer peripheral surface of the camera unit; And a plurality of magnets installed on an inner surface of the camera housing facing the magnet; a support member made of a shape memory alloy material that is installed on the inner peripheral surface of the camera housing and connects the sidewall surface of the lens holder; It can be configured.

The lens holder may include at least one lens; And an optical device disposed on an optical path formed by the lenses to control light passing therethrough.

In this case, the optical device may include an aperture and a shutter, and may be installed in a space between an outermost lens supported by the actuator and the lens facing the outermost lens, or facing the image sensor and the image sensor. It may be interposed in the space between the lenses, or may be interposed in the space formed between the plurality of lenses.

The present invention implements a camera shake correction function by controlling tilting and shifting of one lens using a first actuator, configuring a second actuator with a voice coil motor, etc., and controlling the entire lens module and the first actuator vertically and reciprocating. Since the auto focusing function is implemented, the camera shake correction function and the auto focusing function can be implemented at the same time.

In addition, since the height of the actuator for implementing the auto focusing function can be reduced, the camera module can be configured to be smaller.

1 and 2 are side cross-sectional views schematically showing a camera module according to a first embodiment of the present invention;
3 is a plan view of FIGS. 1 and 2, and,
4 and 5 are side cross-sectional views schematically showing a camera module according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 and 2 are a side cross-sectional view schematically showing a camera module according to a first embodiment of the present invention, FIG. 3 is a plan view of FIGS. 1 and 2, and FIGS. 4 and 5 are a preferred first embodiment of the present invention. 2 is a side cross-sectional view schematically showing a camera module according to an embodiment.

As shown, the camera module according to the present invention includes a camera housing 1, a printed circuit board 10 installed inside the camera housing 1, a lens holder 20, and first and second actuators 30. It includes (40).

The camera housing 1 may be provided in an approximately box shape, and may be provided with an opening at approximately the center thereof, and may be configured to transmit an image image to the printed circuit board 10.

The printed circuit board 10 has an image sensor 11 mounted on an upper surface thereof, and may be installed at a predetermined distance apart from the lower surface of the lens holder 20. An F-PCB (not shown) is connected to a surface opposite to the mounting surface of the image sensor 11 of the printed circuit board 10 so that power is supplied to the image sensor 11 and the image sensor 11 ) Can be output to a predetermined control unit.

Meanwhile, the F-PCB may be configured to supply a control signal and power to the first actuator 30.

The lens holder 20 may have a lens unit 21 installed therein to form an optical path. In the lens unit 21, at least one or more lenses may be sequentially disposed, and optical devices such as a shutter or a diaphragm may be interposed between the lenses as necessary.

For example, when a total of two lenses are disposed on the optical path formed between the first actuator 30 and the image sensor 11, the aperture and the shutter may be disposed in the space between the two lenses, It may be disposed in a space between the lenses and the first actuator 30 or a space between the lenses and the image sensor 11. This arrangement relationship may vary depending on the product design and the configuration of the camera unit.

In addition, the lens holder 20 may be installed to be spaced apart from the image sensor 11 by a predetermined distance, and may be installed to be reciprocated vertically by a second actuator 40 to be described later.

According to the first embodiment of the present invention, the first actuator 30 is an image stabilization device (OIS), which moves one outermost lens 31 in a shifting and tilting direction, so that the image sensor 11 It can be configured so that the focus of the incident image is not affected by the shake of the camera module.

At this time, the first and second actuators 30 and 40 are not shown, but the F-PCB is connected by using a separate connection means or an electronic circuit pattern layer integrally formed on the surface of the lens holder 20. Control signals and power can also be applied through. In this case, the shifting directions of the first lens 31 are vertical and horizontal directions with respect to a plane perpendicular to the incident optical axis direction. 1 and 2, the first actuator 30 may overlap the lens holder 20 in the optical axis direction. The second actuator 40 may overlap the lens holder 20 in a direction perpendicular to the optical axis direction.

For example, when the electronic circuit pattern layer is integrally formed on the surface of the lens holder 20, the first actuator 30 relatively far away from the printed circuit board 10 is Each of them can be connected so as to be energized only by mounting on the circuit pattern layer or bonding with the electronic circuit pattern layer.

In this way, the technology of integrally forming the electronic circuit pattern layer on the surface of the lens holder 20 is collectively referred to as the so-called MID technology (Molded Interconnect Device Technology), and this MID technology is the 2S method, which is a patterning method through double molding. ), LDS method (Laser Direct Structuring method), in which surface patterning is performed by laser exposure, etc. with impurities reacting to light and heat in the lens holder 20, or by etching non-circuit parts after metalizing the entire surface. It can be configured in any one of the MIPTEC methods.

According to the second embodiment of the present invention, the first actuator 30 is a camera shake correction device, which moves one rearmost lens 32 in a shifting and tilting direction, and is incident on the image sensor 11. It can be configured so that the focus of the image is not affected by the shake of the camera module. In this case, the first actuator 30 is the same as the first embodiment described above, and other configurations are the same as the first embodiment described above.

The second actuator 40 moves the lens holder 20 up and down from the first height H1 to the second height H2 as shown in the arrows of FIGS. 1, 2, 4 and 5, It may be provided as an auto focusing unit that automatically adjusts the focus of an image incident on the image sensor 11. According to an embodiment of the present invention, the second actuator 40 may be provided with a voice coil motor structure or a structure using a shape memory alloy.

As an example, the second actuator 40 provided with a voice coil motor structure may be installed at a position corresponding to the magnet 41 and a plurality of magnets 41 installed outside the lens holder 20. It may be composed of a coil 42, and vice versa.

In this case, other configurations except for the second actuator 40 are the same as those of the first embodiment described above.

On the other hand, the magnet 41 and the coil 42, as shown in Fig. 3, it is preferable to arrange two pairs on each side of the camera housing 1, it is also possible to install a pair if necessary.

In addition, in the case of the above-described embodiment, a case in which the camera housing 1 is in the shape of a quadrangular box is illustrated as an example, but is not limited thereto. When the camera housing 1 is provided in a cylindrical shape, the A plurality of coils 42 may be installed on the inner circumferential surface of the camera housing 1, and a magnet 41 may be installed on the outer circumferential surface of the lens holder 20 so as to correspond to the coil 42.

Further, although not shown, the second actuator 40 may be configured using a shape memory alloy (SMA). In this case, a support member composed of a plurality of shape memory alloys and capable of changing length is installed on the inner circumferential surface of the camera housing 1, and the side wall surface of the lens holder 20 is connected to the support member to store the shape. The lens holder 20 may be configured to perform an auto-focusing function while reciprocating in a direction parallel to the optical axis according to a change in the length of the alloy.

According to the present invention, since the outermost lens or one last lens is moved to perform an anti-shake operation (OIS), and the lens holder 20 is lifted and lowered to perform an auto-focusing operation, the size of the camera module is minimized. can do.

In addition, since the first actuator 30 used as the camera shake prevention unit and the lens holder 20 are formed as one module, and the entire module is controlled to reciprocate, the auto focusing function can be performed. While miniaturizing the module, it is possible to obtain high-quality images.

The first and second actuators 30 and 40 are not only MEMS actuators that move using electrostatic force, piezoelectric force, etc., but also MEMS Piezo actuators and MEMS bimorph actuators. , MEMS thermal actuator, MEMS magnetic actuator, MEMS liquid actuator, MEMS liquid actuator, non-MEMS actuator, silicon actuator, liquid lens, shape memory alloy actuator, voice coil motor ( VCM) or the like, and any possible actuator made of a combination thereof can be used in place of any. Lenses with variable focus such as liquid lenses may be referred to as variable focus lenses.

Embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those of ordinary skill in the technical field of the present invention can improve and change the technical idea of the present invention in various forms. Therefore, such improvements and changes will fall within the scope of the present invention as long as it is apparent to those of ordinary skill in the art.

One; Housing 10; Printed circuit board
11; Image sensor 20; Lens holder
21; Lens unit 30; Actuator
31; Outermost lens 32; The last lens
40; Image stabilization device

Claims (18)

Printed circuit board;
An image sensor disposed on the printed circuit board;
A lens holder disposed on the printed circuit board;
A lens disposed on the lens holder;
A first actuator disposed on the lens holder;
A second actuator including a coil disposed on the lens holder and a magnet facing the coil,
The first actuator includes a variable focus lens,
When power is applied to the coil of the second actuator, the first actuator moves together with the lens holder. Printed circuit board;
An image sensor disposed on the printed circuit board;
A lens holder disposed on the printed circuit board;
A lens disposed on the lens holder;
A first actuator disposed on the lens holder;
A second actuator including a magnet disposed on the lens holder and a coil facing the magnet,
The first actuator includes a variable focus lens,
When power is applied to the coil of the second actuator, the first actuator moves together with the lens holder. The method according to claim 1 or 2,
The variable focus lens is a camera module including a liquid lens. The method according to claim 1 or 2,
The variable focus lens performs a camera shake correction function,
The coil and the magnet are a camera module that performs an auto-focusing function. The method according to claim 1 or 2,
A camera module including a flexible printed circuit board (FPCB) electrically connecting the printed circuit board and the variable focus lens. The method according to claim 1 or 2,
Including an electronic circuit pattern layer formed on the surface of the lens holder,
The variable focus lens is a camera module electrically connected to the electronic circuit pattern layer. The method according to claim 1 or 2,
The variable focus lens is a camera module that overlaps the lens holder in the optical axis direction. The method according to claim 1 or 2,
A camera module in which a lower surface of the variable focus lens is in surface contact with an upper surface of the lens holder. The method according to claim 1 or 2,
A camera module in which an upper surface of the variable focus lens is in surface contact with a lower side of the lens holder. The method according to claim 1 or 2,
A camera module in which the coil and the magnet overlap in a direction perpendicular to the optical axis direction with the lens holder. The method according to claim 1 or 2,
And a camera housing disposed on the printed circuit board and covering the lens holder,
The magnet is a camera module disposed between the coil and the inner peripheral surface of the camera housing. The method according to claim 1 or 2,
A camera module including a shutter or aperture disposed on the optical axis of the lens. The method of claim 12,
The lens includes a plurality of lenses,
The shutter or aperture camera module is disposed between the plurality of lenses. The method of claim 12,
The shutter or aperture camera module is disposed between the lens and the variable focus lens. A portable electronic product comprising the camera module of claim 1 or 2. Printed circuit board;
An image sensor disposed on the printed circuit board;
A lens holder disposed on the printed circuit board;
A lens disposed on the lens holder;
A first actuator disposed on the lens holder and performing a camera shake correction function; And
Including a second actuator that performs an auto-focusing function by moving the lens holder,
When the lens holder is moved by the second actuator, the first actuator moves the lens holder together. The method of claim 16,
The first actuator includes a liquid lens,
The second actuator is a camera module including a coil and a magnet. The method of claim 16,
The first actuator includes a liquid lens,
The second actuator is a camera module including a shape memory alloy.

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