TWI448801B - Camera module - Google Patents

Description

Camera module

The invention relates to a camera module, in particular to a camera module with simple structure and miniaturization.

The conventional camera module includes a lens module (Lens Module) and an image pickup sensor (Image Pick-up Sensor). A general lens module has a lens holder, a lens barrel housed in the lens holder, and optical elements such as optical lenses, filters, and the like housed in the lens barrel. The image sensor is disposed at the bottom of the lens holder of the lens module, and is optically coupled to the optical component in the lens barrel. The camera module is mostly used in various portable electronic devices to make it have a camera function. See, for example, Rastislav Lukac et al., IEEE Image on Consumer Electronics, Vol. 51, No. 3, AUGUST 2005, Digital Image Indexing Using Secret Sharing Schemes: A Unified Framework For Single-Sensor Consumer Electronics.

In order to improve the image quality, the camera module is generally equipped with a zoom mechanism and a focusing mechanism. Whether it is a zoom mechanism or a focusing mechanism, it is necessary to zoom or focus by pushing or rotating the lens through the drive mechanism. The existing driving mechanism usually adopts a driver to drive the gear mechanism. When the zoom lens structure of the camera module is in operation, the driver drives the gear to rotate, and at the same time drives the rack to make a linear motion, so that the lens is linearly transported along the optical axis thereof. The optical zoom is realized by changing the relative position between the optical lens and the image sensor. However, the zoom lens structure of the camera module occupies a large volume, and when the transmission is performed, the power loss is large and the driving speed is slow.

Therefore, it is necessary to provide a camera module that is simple in structure, small in size, and fast in driving speed.

A camera module includes: at least two sets of lenses, a lens barrel, a lens holder, an image sensor, and a substrate. The lens holder includes a top of the lens holder and a bottom of the lens holder, and the bottom of the lens holder and the image sensor are carried on the substrate. The lens barrel is placed on the top of the lens holder. The camera module further includes an actuator set including a first actuator and a second actuator. The at least two sets of lenses are respectively disposed in the two actuators. The two actuators are respectively fixedly disposed in the lens barrel. The first actuator is for zooming and the second actuator is for fine tuning focus.

Compared with the prior art, the camera module directly drives the at least two sets of lenses disposed in the actuator to linearly move in the two actuators through the first actuator and the second actuator, thereby Achieve zoom and focus. There is no need to set up another transmission mechanism, the drive unit is small, easy to miniaturize, and the zoom and focus drive speed is fast.

100‧‧‧ camera module

70‧‧‧ at least two sets of lenses

30‧‧‧Actuator group

10‧‧‧Mirror tube

20‧‧‧Mirror base

40‧‧‧Transparent board

50‧‧‧Image sensor

60‧‧‧Substrate

71‧‧‧First lens group

72‧‧‧second lens group

31‧‧‧First actuator

32‧‧‧Second actuator

12‧‧‧ Cover

102‧‧‧ external thread

202‧‧‧Mirror top

204‧‧‧Bottom of the mirror base

206‧‧‧ 容 部

63‧‧‧First Housing Department

64‧‧‧Second Accommodation Department

208‧‧‧ internal thread

310‧‧‧Fixed Department

312‧‧‧Magnetic magnet group

314‧‧‧First magnet

316‧‧‧movable department

318‧‧‧First coil set

3122‧‧‧Upper magnetic parts

3124‧‧‧ lower magnetic guide

320‧‧‧second coil set

322‧‧‧second magnet

324‧‧‧Shrap

501‧‧‧ wafer pads

61‧‧‧ bearing surface

62‧‧‧Bottom of the substrate

641‧‧‧step surface

631‧‧‧ bottom

601‧‧‧Substrate pad

80‧‧‧ wire

1 is a schematic cross-sectional view of a camera module according to an embodiment of the present invention; FIG. 2 is a schematic view of a first actuator of the camera module of FIG. 1; and FIG. 3 is a second actuator of the camera module of FIG. schematic diagram.

Referring to FIG. 1 to FIG. 3 , the camera module 100 of the present invention includes at least two sets of lenses 70 , an actuator set 30 , a lens barrel 10 , a lens holder 20 , a light transmissive plate 40 , and a sense of image. The detector 50 and a substrate 60.

In this embodiment, the at least two sets of lenses 70 include a first lens set 71 and a second lens set 72. The first lens set 71 includes two optical lenses, and the second lens set 72 includes three optical lenses.

The actuator set 30 includes a first actuator 31 and a second actuator 32. The first lens group 71 and the second lens group 72 are respectively disposed in the first actuator 31 and the second actuator 32 and can be axially respectively disposed on the first actuator 31 and the second actuator 32. Linear motion. The first lens group 71 and the second lens group 72 have a common optical axis. In the present embodiment, the first actuator 31 and the second actuator 32 are both voice coil motors, and the first actuator 31 is used for zooming. The second actuator 32 is used for fine adjustment to achieve focus.

The lens barrel 10 has a hollow cylindrical shape, and the first actuator 31 and the second actuator 32 are respectively embedded in the lens barrel 10 by being adhesively or screwed. The top cover of the lens barrel 10 is provided with a transparent cover 12, which can pass light, and can block impurities such as dust from entering the camera module 100 to contaminate the two sets of lenses 70. An outer thread 102 is provided on the outer side of the lens barrel 10.

The lens holder 20 has a hollow truncated cone shape. The lens holder 20 includes a lens holder top portion 202 and a lens holder bottom portion 204. The top portion 202 of the lens holder is a cylinder, and the bottom portion 204 of the lens holder has a one-piece structure. The bottom portion 204 of the lens holder 204 is provided with a receiving portion 206 that penetrates the top portion 202 of the lens holder. The outer diameter of the receiving portion 206 is larger than the outer diameter of the top portion 202 of the lens holder, and a step is formed at the junction of the two. The mirror mount 20 is provided with internal threads 208. The lens barrel 10 passes through its outer snail The pattern 102 is screwed to the internal thread 202 of the lens holder 20 and disposed on the top portion 202 of the lens holder.

In practical applications, the camera module 100 may directly embed the first and second actuators 31 and 32 in the lens holder top 202 without providing the lens barrel 10, and is not limited to the embodiment.

The first actuator 31 includes a fixing portion 310, a magnetic component group 312, two first magnets 314, a movable portion 316 and a first coil group 318. The magnetic component group 312 , the two first magnets 314 , the movable portion 316 , and the first coil assembly 318 are received in the fixing portion 310 , and the movable portion 316 is axially movable relative to the fixing portion 310 . The two first magnets 314 and the movable portion 316 are both annular structures, and the first magnets 314 are fixedly disposed on the movable actuator 316. In this embodiment, the magnetic component group 312 includes two oppositely disposed upper magnetic conductive members 3122 and two oppositely disposed lower magnetic conductive members 3124. The two upper magnetic conductive members 3122 and the two lower magnetic conductive members 3124 are respectively disposed at two ends of the fixing portion 310 at intervals. The first coil group 318 is wound around the fixing portion 310. The first lens group 71 is fixed in the movable portion 316. In use, the first coil set 318 is energized, and the first coil set 318 generates a magnetic field that causes a Lorentz force between the first magnets 314 on the movable portion 316 to push the movable portion 316 relative to each other. The fixing portion 310 performs axial linear motion. The first lens group 71 is fixed between the two movable portions 316 and moves with the movement of the movable portion 316, thereby changing the distance between the first lens group 71 and the second lens group 72 and the image sensor 50. Achieve zoom. For example, when the first coil group 318 is connected to the polarity current as shown in FIG. 2, the Lorentz force generated between the first coil group 318 and the first magnet 314 causes the movable portion 316 to be moved from the upper magnetic member 3122. The lower magnetic member 3124 is axially linearly moved until the first magnet 314 is adsorbed and positioned by the lower magnetic member 3124. When the first coil group 318 is again connected to a current of opposite polarity, When the Lorentz force generated between the first magnet 314 and the first coil group 318 is greater than the suction force between the lower magnetic member 3124 and the first magnet 314, the Lorentz force causes the first magnet 314 to be guided by the lower magnet. The piece 3124 makes an axial linear motion in the direction of the upper magnetic conductive member 3122 until the first magnet 314 is adsorbed and positioned by the upper magnetic conductive member 3122.

The second actuator 32 includes a second coil set 320, a second magnet 322, and two spring pieces 324. The second magnet 322 and the second coil group 320 have a ring structure. The second lens group 72 is disposed in the second coil group 320 , and the second magnet 322 is disposed at the periphery of the second coil group 320 . In this embodiment, the second coil set 320 is movable relative to the second magnet 322. A spring piece 324 is fixed to each side of the second coil group 320. The distance between the two elastic pieces 324 is slightly larger than the length of the second magnet 322. In use, the second coil set 320 is energized, and the second coil set 320 and the second magnet 322 generate a Lorentz force to push the second coil set 320 to move, thereby driving the second lens set 72 together to make an axial straight line. motion. At the same time, the second coil set 320 resists the elastic piece 324 during the energization movement, and the elastic piece 324 is deformed. The elastic piece 324 inhibits the second coil set 320 from moving the second lens set 72 until the second coil set 320 and the first coil set 320 When the Lorentz force generated by the two magnets 322 is balanced with the elastic force generated by the elastic piece 324, the second coil group 320 stops moving, so that the second coil group 320 drives the second lens group 72 to be slightly opposite to the image sensor 50. Displacement to achieve precise focus. When the second coil set 320 is powered off, the elastic piece 324 provides an elastic force to the second coil set 320 to bounce the second lens set 72.

The image sensor 50 can be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), which is used to convert the optical signal. Turned into a telecommunication signal. The image sensor 50 is provided with a plurality of wafer pads 501.

The substrate 60 can be made of a material such as glass fiber, reinforced plastic or ceramic. The substrate 60 includes a bearing surface 61 and a substrate bottom surface 62 opposite to the bearing surface 61. The mirror base 204 is carried on the bearing surface 61 of the substrate 60. In this embodiment, the substrate 60 has a recessed surface in the direction of the bottom surface 62 of the substrate. In the embodiment, the recess is a stepped structure, and the recess of the stepped structure includes a first receiving portion 63 and a second accommodating portion 64, the first accommodating portion 63 is in communication with the second accommodating portion 64, and the second accommodating portion 64 is larger in size than the second accommodating portion 63, and is connected to the two A stepped surface 641 is formed. The second receiving portion 63 has a bottom surface 631. The bottom surface 631 is provided with a plurality of substrate pads 601 corresponding to the plurality of wafer pads 501. The image sensor 50 is received in the second receiving portion 63 and carried on the bottom surface 631 of the second receiving portion 63. The camera module 100 further includes a plurality of wires 80. The plurality of wires 501 are respectively connected to the substrate pads 601 through the plurality of wires 80 to electrically connect the image sensor 50 to the substrate 60.

In practical applications, the image sensor 50 can be mechanically and electrically connected to the substrate 60 by flip chip, inner pin bonding, automatic tape bonding, flip chip bonding or thermocompression bonding. It is not limited to this embodiment.

Preferably, the camera module 100 further includes a light transmissive plate 40. The light transmissive plate 40 is received in the first receiving portion 64 and is fixed on the step surface 641 to protect the image sensor 50. Dust water vapor contaminates the image sensor 50. The light-transmitting plate 40 is a light-transmissive glass, and one surface thereof may be coated with an IR-cut coating to filter out infrared rays from the reflected light of the object, thereby further improving the image quality.

The camera module directly drives the at least two sets of lenses disposed in the actuator to perform axial linear movement in the two actuators by the first actuator and the second actuator to achieve zooming and focusing. There is no need to set up another transmission mechanism, the drive unit is small, easy to miniaturize, and the zoom and focus drive speed is fast.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧ camera module

70‧‧‧ at least two sets of lenses

30‧‧‧Actuator group

10‧‧‧Mirror tube

20‧‧‧Mirror base

40‧‧‧Transparent board

50‧‧‧Image sensor

60‧‧‧Substrate

71‧‧‧First lens group

72‧‧‧second lens group

31‧‧‧First actuator

32‧‧‧Second actuator

12‧‧‧ Cover

102‧‧‧ external thread

202‧‧‧Mirror top

204‧‧‧Bottom of the mirror base

206‧‧‧ 容 部

63‧‧‧First Housing Department

64‧‧‧Second Accommodation Department

208‧‧‧ internal thread

501‧‧‧ wafer pads

61‧‧‧ bearing surface

62‧‧‧Bottom of the substrate

641‧‧‧step surface

631‧‧‧ bottom

601‧‧‧Substrate pad

80‧‧‧ wire

Claims (9)

A camera module includes: two sets of lenses, a lens barrel, a lens holder, an image sensor and a substrate, the lens holder including a top of the lens holder and a bottom of the lens holder, the bottom of the lens holder and the image sense The detector is carried on the substrate, and the lens barrel is disposed on the top of the lens holder. The improvement is that the camera module further includes an actuator group, and the actuator group includes a first actuator and a second actuator. The two sets of lenses are respectively disposed in the two actuators, the two actuators are respectively fixedly disposed in the lens barrel, the first actuator is used for zooming, and the second actuator is used for fine-tuning the focus, The substrate includes a bearing surface for carrying the lens holder and a bottom surface of the substrate opposite to the bearing surface, and the substrate has a stepped groove formed by the bearing surface facing the bottom surface of the substrate, the groove including the first receiving portion And a second accommodating portion, the image sensor is received in the second accommodating portion and is carried on the bottom surface of the second accommodating portion, and the first accommodating portion is connected to the second accommodating portion Forming a step surface, the camera module further includes a light transmissive plate Plate fixed to the stepped surface. The camera module of claim 1, wherein the first actuator and the second actuator are both voice coil motors. The camera module of claim 1, wherein the two sets of lenses comprise a first lens group and a second lens group, wherein the first lens group and the second lens group are respectively disposed on the first actuator And axially linearly movable within the second actuator and within the first actuator and the second actuator, respectively. The camera module of claim 1, wherein the first actuator comprises a fixing portion, a magnetic guiding member group, two first magnets, a movable portion and a first coil The upper magnetic conductive member and the lower magnetic conductive member are disposed at two ends of the fixed portion, and the two first magnets and the movable portion are respectively disposed. The first coil group is fixed in the movable portion, and the two first magnets are respectively disposed at two ends of the movable portion, and the movable portion is disposed on the annular portion. The fixed portion is axially movable relative to the fixed portion. The camera module of claim 3, wherein the second actuator comprises a second coil set, a second magnet and two elastic pieces, the second coil set and the second magnet are both rings The second lens group is disposed in the second coil group, and the second magnet is disposed on the periphery of the second coil group, and a spring piece is respectively fixed on both sides of the second coil group. The camera module of claim 5, wherein the distance between the two elastic pieces is slightly larger than the length of the second magnet. The camera module of claim 1, wherein: the image sensor is provided with a plurality of wafer pads, and the bottom surface of the second receiving portion is provided with a plurality of substrate pads corresponding to the plurality of wafer pads The camera module further includes a plurality of wires, and the plurality of wires are respectively connected to the substrate pads through the plurality of wires to electrically connect the image sensor to the substrate. The camera module of claim 1, wherein: the light-transmitting plate is a light-transmissive glass, and a surface thereof is coated with an infrared cut filter to filter infrared rays from the reflected light of the object. . The camera module of claim 1, wherein the camera module further comprises a transparent cover, the transparent cover being disposed at a top end of the lens barrel.