TWI593998B - Periscope 8 million pixel 12x zoom phone lens - Google Patents

Description

Periscope eight million pixels 12 times zoom phone lens

The invention relates to the technical field of a mobile phone lens, in particular to a periscope eight-megapixel 12x zoom mobile phone lens.

Most of today's mobile phone lenses are fixed-focus lenses. Because fixed-focus lenses have the advantages of simple manufacturing and small size, although the mobile phone has the function of digital zoom, it has limited optical zoom ratio and sacrifices part of the image quality. Optical zoom requires the mirror group to move to change the focal length, so more space is needed, making it difficult to reduce the volume.

In 2007, K. Matsusaka et al. designed a 3 million-pixel 2.76-fold zoom phone lens consisting of five aspherical lenses with an aperture value (F/#) of 3.3 to 5.9 and a lens length of 20 mm. C.C.Liao invented a four-group six-lens 2.83x zoom lens with seven aspheric surfaces and a lens length of 20.5mm. C.W. Chang et al. proposed a three-million-pixel 2.40-fold zoom phone lens design consisting of five aspherical lenses with a zoom lens length of 16.5 mm. In 2012, H.C.Tang et al. proposed three groups of five-lens 1.37x zoom lenses, consisting of four aspherical surfaces and a spherical lens. The lens length is 29.327mm and the maximum diameter is 9mm.

The periscope design folds the optical path by a right angle ,, so that the moving part of the lens changes in the other direction, which can avoid the disadvantage that the thickness of the zoom lens is too thick, and this method is gradually applied to the mobile phone, the zoom lens Can be hidden in the mobile phone, to overcome the shortcomings of the zoom lens to greatly increase the body. In 2009, J.H.Chung et al. designed a periscope four-group 3x zoom. Five million pixel camera lens with focal length of 4.75mm to 14.25mm, aperture value (F/#) of 3.5 to 6.8, full viewing angle of 61.7° to 23.7°, lens length of 28mm, lens thickness of 9mm, and contrast ratio of 50 From % to 85%, the optical distortion is -4.5% to 1.0%.

In 2008, S.C. Park et al. designed a periscope four-group 2.9x zoom lens that does not require a right-angled front lens. The lens thickness is 7mm and the lens length is 37.56mm. In 2009, S.C. Park et al. proposed a periscope four-group 5x zoom lens with a lens thickness of 8mm and a lens length of 40mm.

In 2012, S.C.Chia designed a periscope three-group 2.55x zoom lens consisting of a right-angled cymbal and six lenses. The lens thickness is 8.23mm and the lens length is 35.83mm. However, the lens of these structures has a lens at the right angle of the front side of the lens to increase the thickness.

In 2013, SCPark et al. proposed a 9.5x zoom lens of the periscope four-mirror group. The first lens group of the zoom lens is fixed, the focal length is 4.2mm to 39.9mm, and the aperture value (F/#) is 3.5 to 4.5. It consists of a right-angled cymbal and ten lenses. The length of the right-angled cymbal is 12mm, which is the thickness of the lens. The length of the lens is 53mm.

In summary, the current difficulties and shortcomings in the development of mobile phone lens technology are as follows:

1. At present, the mobile phone lens on the market is limited by the installation space, and it is not possible to reduce the lens structure of the optical zoom to be installed in the structure of the mobile phone, and achieve the zoom function of 12 times.

2. Optical zoom requires the lens group to move to change the focal length, so more space is needed, and it is difficult to reduce the image quality in the design of the 12x zoom lens.

Therefore, how to deal with the difficulties faced by the development of the above-mentioned camera lens technology and The inventors who innovate and invent the shortcomings are the difficult points to solve in this case.

The main object of the present invention is to provide a periscope eight-megapixel 12x zoom mobile phone lens, which is placed at a right angle in front of the lens to make the optical path turn 90°, so that the lens thickness is equal to the length of the lens, and the lens is controlled. Both the thickness and the length can be hidden in the mobile phone, and the three mirror groups arranged by different concave and convex and curvature are changed in different arrangement in the lens length to achieve 12x optical zoom, and the optimized design makes the imaging quality have certain Requirements to achieve better use of the step.

In order to achieve the above-mentioned purpose and effect, the present invention has an eight-megapixel 12x zoom mobile phone lens for imaging an object side object on an image side of the image side, including: a first mirror group, And disposed between the object side and the imaging surface and including a first lens, a first lens and a second lens disposed between the object side and the imaging surface, the first lens being a concave lens and disposed on the 稜鏡The second lens is a convex lens and is disposed between the first lens and the imaging surface; a second lens group is disposed between the first mirror group and the imaging surface and includes a third lens, a fourth lens and a first driving member, the third lens is a convex lens and is disposed between the first mirror group and the imaging surface, the fourth lens is a concave lens and is located between the third lens and the imaging surface, the first lens The driving member drives the second mirror group to move relative to the first mirror group; a third mirror group is disposed between the second mirror group and the imaging surface and includes a fifth lens and a second driving member, the fifth lens a convex lens, the second driving member drives the fifth lens to move relative to the first mirror group; and an image sense Positioned at a position of the imaging surface; wherein the second mirror group and the third mirror group move relative to the first mirror group to achieve zooming, the second mirror group is adjacent to the first mirror group and the third mirror group The five lenses are close to the imaging surface to form a telephoto focal length mode, the second mirror group being away from the first mirror group and adjacent to the fifth lens of the third mirror group to form a wide-angle focal length The mode, and the focal length of the telephoto focal length mode is 12 times the focal length of the wide-angle focal length mode.

A further technical feature of the present invention is that the minimum focal length of the wide-angle focal length mode is 4 mm, and the maximum focal length of the telephoto focal length mode is 48 mm.

A further technical feature of the present invention is that the length of the cymbal is 7 mm, and the diameters of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are both less than 7 mm, and the 稜鏡 to the imaging surface The distance is 60mm.

A further technical feature of the present invention is that the first lens is a biconcave lens and has a radius of curvature of (7.5804, -2.6258), the second lens is a lenticular lens and has a radius of curvature of (-6.8431, 24.1316).

A further technical feature of the present invention is that the first driving member of the second mirror group is a stepping motor, the third lens is a lenticular lens and has a radius of curvature of (-2.8586, 2.0899), and the fourth lens is a biconcave lens and has a curvature The radius is (1.7089, -15.7804).

A further technical feature of the present invention is that the second driving member of the third mirror group is a stepping motor, and the fifth lens is a lenticular lens and has a radius of curvature of (-7.6779, 7.0312).

A further technical feature of the present invention is that the image sensor has a resolution of eight million pixels and is further combined with a protective glass located on one side of the image sensor relative to the third mirror group.

A further technical feature of the present invention is that the image sensor further incorporates an infrared filter lens and is located between the cover glass and the third mirror group.

(200) ‧‧‧ Scenery

(100)‧‧‧ imaging surface

(1)‧‧‧First mirror group

(11)‧‧‧稜鏡

(12)‧‧‧First lens

(13)‧‧‧second lens

(2) ‧‧‧Second mirror group

(21)‧‧‧ Third lens

(22)‧‧‧Fourth lens

(23)‧‧‧First drive

(3) ‧‧‧ third mirror group

(31)‧‧‧ fifth lens

(32)‧‧‧second drive

(4)‧‧‧Image sensor

(41) ‧‧‧protective glass

(42)‧‧‧Infrared filter lenses

The first picture shows the structure of the periscope 8 million pixel 12x zoom mobile phone lens A schematic plan view of the angular focal length position.

The second figure is a schematic plan view of the position of the intermediate focal length of the periscope 8 million pixel 12x zoom mobile phone lens structure.

The third figure is a schematic plan view of the position of the telephoto segment of the telescope of the 8 million-pixel zoom camera of the present invention.

The fourth figure is a schematic diagram of the imaging quality evaluation of the periscope 8 million pixel 12x zoom mobile phone lens structure at a wide angle focal length position at 30°.

The fifth figure is a schematic diagram of the imaging quality evaluation of the periscope 8 million pixel 12x zoom mobile phone lens structure at the intermediate focal length position at 15°.

The sixth figure is a schematic diagram of the imaging quality evaluation of the periscope 8 million pixel 12x zoom mobile phone lens structure in the telephoto focal length position at 10°.

In the seventh figure, the lens of the present invention simulates the performance intention of the different focal lengths of the telephoto focal length, the intermediate focal length and the wide-angle focal length and the relative illumination of all the viewing angles.

In order to achieve the above objects and effects, and the technical means and configurations employed, the features and effects of the embodiments of the present invention are described in detail with reference to the accompanying drawings.

Referring to the first to third figures, a periscope eight-megapixel 12x zoom mobile phone lens of the present invention is used to image an object side object (200) on an image side (100) on the image side, including a first mirror group (1) disposed between the object side and the imaging surface (100) and including a cymbal (11), a first lens (12) and a second lens (13), The first lens (11) is a concave lens and is disposed between the crucible (11) and the imaging surface (100), and the second lens (13) is disposed between the object side and the imaging surface (100). ) is a convex lens and is disposed on the first lens (12) Between the imaging surface (100).

a second mirror group (2) disposed between the first mirror group (1) and the imaging surface (100) and including a third lens (21), a fourth lens (22), and a first driving The third lens (21) is a convex lens and is disposed between the first mirror group (1) and the imaging surface (100), the fourth lens (22) is a concave lens and is located at the third lens (21) Between the imaging surface (10), the first driving member (23) drives the second mirror group (2) to move relative to the first mirror group (1).

a third mirror group (3) disposed between the second mirror group (2) and the imaging surface (100) and including a fifth lens (31) and a second driving member (32), the fifth The lens (31) is a convex lens, and the second driving member (32) drives the fifth lens (31) to move relative to the first mirror group (1).

And an image sensor (4) fixed to the position of the imaging surface (100).

The second mirror group (2) and the third mirror group (3) move relative to the first mirror group (1) to achieve zooming, and the second mirror group (2) is adjacent to the first mirror group (1) and the first The fifth lens (15) of the three-mirror group (3) is close to the imaging surface (100) to constitute a telephoto focal length mode, and the second mirror group (2) is away from the first mirror group (1) and close to the third mirror group (3) The fifth lens (15) is configured to form a wide-angle focal length mode, and the focal length of the telephoto focal length mode is 12 times the focal length of the wide-angle focal length mode.

The foregoing is a main technical feature of the main embodiment of the present invention, which corresponds to the content of the first item of the patent application scope of the present application, and the object and the implementation form of the present invention are known in detail, and the technical features described in the remaining subsidiary patent scopes are The detailed description or additional technical features of the first content of the patent application scope, and not to limit the scope of the first paragraph of the patent application scope, it should be noted that the first item of the patent application scope of the present application does not necessarily include the scope of the remaining subsidiary patents. Technical characteristics.

In the first to third figures, the minimum focal length of the wide-angle focal length mode is 4 mm, the maximum focal length of the telephoto focal length mode is 48 mm; secondly, the length of the cymbal (11) is 7 mm, and the first lens (12), the second lens (13), the third lens (21), The diameters of the fourth lens (22) and the fifth lens (31) are both less than 7 mm, and the distance from the 稜鏡 (11) to the imaging surface (100) (lens length) is 60 mm; further, the first lens (12) Is a biconcave lens and has a radius of curvature of (object side curvature radius 7.5804, image side curvature radius -2.6258), the second lens (13) is a lenticular lens and the radius of curvature is (object side curvature radius -6.8431, image side curvature radius 24.1316) Moreover, the first driving member (23) of the second mirror group (2) is a stepping motor, and the third lens (21) is a lenticular lens and has a radius of curvature of (object side curvature radius -2.8586, image side curvature) Radius 2.0899), the fourth lens (22) is a biconcave lens and the radius of curvature is (object side radius of curvature 1.7089, image side radius of curvature -15.7804); in addition, the second mirror group (3) of the second driver ( 32) is a stepping motor, the fifth lens (15) is a lenticular lens and has a radius of curvature of (object side curvature radius -7.6779, image side curvature radius 7.0312); in addition, the image sensing The resolution of the device (4) is eight million pixels and further combined with a protective glass (41) located on the side of the image sensor (4) opposite to the third mirror group (3); The image sensor (4) is further combined with an infrared filter lens (42) and located between the cover glass (41) and the third mirror group (3).

In the first figure, the first mirror group (1) is fixed by the combination of the three mirror groups arranged by the different concavities and curvatures, and the second mirror group (2) and the third mirror group (3) are combined. The first and second driving members (23, 32, that is, the stepping motor) can be driven by the digital setting (that is, the internal digital focus setting of the installed mobile phone), and the second mirror group (2) and the third mirror are driven. Group (3) moves relative to the first mirror group (1) for zooming; when the second mirror group (2) is away from the first mirror group (1) and is close to the fifth lens of the third mirror group (3) (15) The system constitutes a wide-angle focal length mode, and the focal length minimum in the wide-angle focal length mode operation is 4 mm.

As shown in the third figure, the second mirror group (2) and the third mirror group (3) are combined with the first and second driving members through the combination of the three mirror groups arranged by the different concave and convex and curvature lenses. 32, that is, the stepping motor), can be driven by the digital setting (ie, the internal digital focus setting of the installed mobile phone), and the second mirror group (2) and the third mirror group (3) are relatively opposed to the first mirror group ( 1) an operation of moving to zoom; when the second mirror group (2) is close to the first mirror group (1) and the fifth lens (15) of the third mirror group (3) is close to the imaging surface (100) The telephoto focal length mode is used, and the maximum focal length in the telephoto focal length mode operation is 48 mm (the minimum focal length of the wide-angle focal length mode is 12 times that of 4 mm).

As described above, the present invention allows the optical path to be turned by 90° through a right angle of 7 mm, so that the length of the 稜鏡 (11) is equal to the thickness of the lens, and the three mirror groups arranged by different concave and convex lenses can be used in the lens of 60 mm. The optical zoom is 12 times in the length of the different mirror groups, so that the thickness and length of the lens of the present invention can be assembled in the mobile phone.

As shown in the fourth figure, the schematic diagram of the imaging quality simulation evaluation of the different angles at the wide-angle focal length position of the present invention (30° is shown in the figure), the abscissa in the figure is the spatial frequency and the ordinate is the adjustment value of the imaging quality. The solid line in the figure represents the tangential direction (Y), and the broken line represents the radial direction (X). According to the ordinate corresponding to the horizontal dotted line in the figure, the minimum value of the imaging quality simulation evaluation is 0.486.

As shown in the fifth, the imaging quality evaluation diagram of the different angles of the intermediate focal length position of the present invention (15° is shown in the figure), according to the vertical coordinate corresponding to the horizontal dotted line in the figure, the minimum of the imaging quality simulation evaluation is as shown in the figure. The value is 0.548.

As shown in the sixth, the imaging quality evaluation diagram of the different angles of the wide-angle focal length position of the present invention (shown as 10° in the figure) corresponds to the horizontal dotted line in the figure. The ordinate of the image shows that the minimum value of the imaging quality simulation evaluation is 0.577.

Summarizing the results of the imaging quality simulation evaluations of the above four to six figures, it is understood that the minimum value of the imaging quality simulation evaluation of the present invention is 0.486.

As shown in the seventh figure, the relative focal lengths of the telephoto focal length, the intermediate focal length and the wide-angle focal length of the present invention are simulated and evaluated. The abscissa is the lens image height and the ordinate is the phase contrast value. In the figure, the solid line represents the telephoto focal length, the dotted line represents the intermediate focal length, and the dotted line represents the wide-angle focal length. The lowest point of the dotted line in the figure falls at 67.5965, and the minimum value of the contrast of the present invention is 67.5965%.

From the imaging quality of the top four to seven images and the simulation evaluation of the relative contrast, it can be seen that the optimized design of the periscope 8 million pixel 12x zoom mobile phone lens of the present invention can meet certain requirements in imaging quality and contrast performance (imaging The quality performance is greater than 0.486%, and the contrast performance is greater than 67.5965%), and the optical zoom method is used to surpass the current technical threshold without sacrificing image quality, and the zoom with 12 times is achieved.

The invention as described above can truly break through the difficulties and shortcomings faced in the development of the current mobile phone lens technology, and achieve the following advantages:

1. By placing a 7mm right angle in front of the lens, the optical path is turned 90°, the lens thickness is equal to the length of 稜鏡(11), and the three mirror groups arranged by different concave and convex lenses can be used in the lens of 60mm. The length is changed in different mirror groups to achieve a 12x optical zoom.

2, effectively control the thickness and length of the lens can be assembled in the mobile phone, and through the optimized design of the lens, the imaging quality has certain requirements, and in the operation of the 12-fold zoom can achieve without sacrificing the image quality. A certain image quality.

The above is only a preferred embodiment for explaining the present invention, and is not intended to limit the invention in any way, so that any modifications relating to the present invention are made in the spirit of the same invention. And the changer, other types that can be implemented and have the same effect, should still be included in the scope of the intention of the present invention.

In summary, the "peep-looking eight-megapixel 12-time zoom mobile phone lens" of the present invention is practically and cost-effectively and fully meets the needs of industrial development, and the disclosed structural invention also has The unprecedented innovative structure, so its "novelty" should be undoubted, and the invention can be more effective than the conventional structure, so it is also "progressive", which fully complies with the application requirements of the invention patents of the Chinese Patent Law. The stipulation is to file a patent application in accordance with the law, and I would like to ask the bureau to review it as soon as possible and give it affirmation.

(200) ‧‧‧ Scenery

(100)‧‧‧ imaging surface

(1)‧‧‧First mirror group

(11)‧‧‧稜鏡

(12)‧‧‧First lens

(13)‧‧‧second lens

(2) ‧‧‧Second mirror group

(21)‧‧‧ Third lens

(22)‧‧‧Fourth lens

(23)‧‧‧First drive

(3) ‧‧‧ third mirror group

(31)‧‧‧ fifth lens

(32)‧‧‧second drive

(4)‧‧‧Image sensor

(41) ‧‧‧protective glass

(42)‧‧‧Infrared filter lenses

Claims (8)

A periscope eight-megapixel 12x zoom mobile phone lens for imaging an object side object on an image side of the image side, comprising: a first mirror group disposed on the object side and the image plane And comprising a first lens and a second lens disposed between the object side and the imaging surface, the first lens being a concave lens and disposed between the edge and the imaging surface, the first The second lens is a convex lens and is disposed between the first lens and the imaging surface; a second lens group is disposed between the first mirror group and the imaging surface and includes a third lens, a fourth lens and a first lens a driving member, the third lens is a convex lens and is disposed between the first mirror group and the imaging surface, the fourth lens is a concave lens and is located between the third lens and the imaging surface, the first driving component drives the first The second lens group is moved relative to the first mirror group; a third lens group is disposed between the second mirror group and the imaging surface and includes a fifth lens and a second driving member, wherein the fifth lens is a convex lens. The second driving member drives the fifth lens to move relative to the first mirror group; and an image sensor is fixedly disposed Position of the imaging surface; wherein the second mirror group and the third mirror group move relative to the first mirror group to achieve zooming, the second mirror group is adjacent to the first mirror group and the fifth lens of the third mirror group Close to the imaging surface to form a telephoto focal length mode, the second mirror group is away from the first mirror group and close to the fifth lens of the third mirror group to form a wide-angle focal length mode, and the focal length of the telephoto focal length mode is the wide-angle focal length mode 12 times the focal length. The peri-expective eight-megapixel 12x zoom mobile phone lens according to claim 1, wherein the focal length of the wide-angle focal length mode has a minimum value of 4 mm, and the maximum focal length of the telephoto focal length mode is 48 mm. The periscope eight million pixel 12x zoom mobile phone lens as claimed in claim 1 The length of the crucible is 7 mm, and the diameters of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all less than 7 mm, and the distance from the crucible to the imaging surface is 60 mm. The peri-expective eight-megapixel 12x zoom mobile phone lens according to claim 1, wherein the first lens is a biconcave lens and the radius of curvature is (object side curvature radius 7.5804, image side curvature radius -2.6258), the first The two lenses are lenticular lenses and have a radius of curvature of (object side radius of curvature - 6.8431, image side radius of curvature 24.1316). The peri-expective eight-megapixel 12x zoom mobile phone lens according to claim 1, wherein the first driving member of the second mirror group is a stepping motor, the third lens is a lenticular lens and the radius of curvature is The side curvature radius is -2.8586, and the image side curvature radius is 2.0899. The fourth lens is a biconcave lens and the radius of curvature is (object side curvature radius 1.7089, image side curvature radius -15.7804). The peri-expective eight-megapixel 12x zoom mobile phone lens according to claim 1, wherein the second driving member of the third lens group is a stepping motor, the fifth lens is a lenticular lens and has a radius of curvature Side radius of curvature -7.6779, image side curvature radius 7.0312). The periscope eight-megapixel 12x zoom mobile phone lens according to any one of claims 1 to 6, wherein the image sensor has a resolution of eight million pixels and further combined with a protective glass, the protection The glass is located on a side of the image sensor opposite the third mirror group. The peri-expective eight-megapixel 12x zoom mobile phone lens of claim 7, wherein the image sensor further incorporates an infrared filter lens and is located between the protective glass and the third mirror group.