TWI436093B

TWI436093B - Lens assembly having liquid lens

Info

Publication number: TWI436093B
Application number: TW100130047A
Authority: TW
Inventors: Yi Chin Fang; Jung Hung Sun; Cheng Mu Tsai; Cheng Lun Chung
Original assignee: Univ Nat Kaohsiung 1St Univ Sc
Priority date: 2011-08-23
Filing date: 2011-08-23
Publication date: 2014-05-01
Also published as: TW201310063A

Description

具有液態鏡頭之鏡頭總成Lens assembly with liquid lens

本發明係關於一種鏡頭總成，特別是一種具有高折射玻璃之液態鏡頭之鏡頭總成。The present invention relates to a lens assembly, and more particularly to a lens assembly for a liquid lens having a high refractive glass.

由於科技之進步，具有照相功能之手機日漸普及且深受消費者喜愛。為了達到照相功能，手機內部必須附加一微型相機系統。目前應用於該微型相機系統之鏡頭總成通常僅能達到二倍變焦，而且其使用之透鏡數目較多，因此此種鏡頭之設計難度很高。Due to advances in technology, mobile phones with camera functions are becoming more popular and popular among consumers. In order to achieve the camera function, a miniature camera system must be attached to the inside of the phone. Currently, the lens assembly applied to the miniature camera system can only achieve double zoom, and the number of lenses used therein is large, so the design of such a lens is very difficult.

另外，習知應用於微型電子裝置(例如該微型相機系統)之鏡頭總成之缺點為，在變焦時需要伸長或縮短該鏡頭總成，亦即該鏡頭總成並無法固定在一個長度。再者，該習知之鏡頭總成通常具有一變焦鏡組，該變焦鏡組係利用一齒輪組而達到移動之功能，進而得到調整焦距之功效。由於必須轉動該齒輪組才能移動該變焦鏡組，因此該齒輪組會有磨損之問題。In addition, a conventional lens assembly applied to a microelectronic device (for example, the micro camera system) has the disadvantage that it is required to extend or shorten the lens assembly during zooming, that is, the lens assembly cannot be fixed at a length. Moreover, the conventional lens assembly usually has a zoom lens group that uses a gear set to achieve the function of moving, thereby obtaining the effect of adjusting the focal length. Since the gear set must be rotated to move the zoom lens set, the gear set has a problem of wear.

因此，有必要提供一創新且富進步性的液態鏡頭及具有液態鏡頭之鏡頭總成，以解決上述問題。Therefore, it is necessary to provide an innovative and progressive liquid lens and a lens assembly with a liquid lens to solve the above problems.

本發明係提供一種具有液態鏡頭之鏡頭總成，其依序包括一第一鏡組、一第一液態鏡頭、一第二液態鏡頭、一光柵、一第二鏡組、一數位訊號處理器及一傳動元件。該第一鏡組係為固定不動。該第一液態鏡頭係為固定不動，其依序包括一第一玻璃層、一第一液體層、一第二液體層及一第二玻璃層，該第一液態鏡頭係為正光焦度。該第二液態鏡頭係為固定不動，其依序包括一第三玻璃層、一第三液體層、一第四液體層及一第四玻璃層，該第二液態鏡頭係為負光焦度，該第三玻璃層之折射率係大於該第一玻璃層之折射率，該第四玻璃層之折射率係大於該第二玻璃層之折射率。該第一液態鏡頭及該第二液態鏡頭負擔70%以上的變焦功能。該光柵係為固定不動。該第二鏡組係可作不規則離散位移，該第二鏡組係為正光焦度。該傳動元件係連接至該數位訊號處理器及該第二鏡組，該數位訊號處理器利用該傳動元件以控制該第二鏡組之不規則離散位移。The present invention provides a lens assembly having a liquid lens, which includes a first lens group, a first liquid lens, a second liquid lens, a grating, a second lens group, and a digital signal processor. A transmission element. The first mirror is stationary. The first liquid lens is fixed, and includes a first glass layer, a first liquid layer, a second liquid layer and a second glass layer. The first liquid lens is positive power. The second liquid lens is fixed, and includes a third glass layer, a third liquid layer, a fourth liquid layer and a fourth glass layer. The second liquid lens is negative power. The refractive index of the third glass layer is greater than the refractive index of the first glass layer, and the refractive index of the fourth glass layer is greater than the refractive index of the second glass layer. The first liquid lens and the second liquid lens have a zoom function of 70% or more. The grating is stationary. The second mirror group can be an irregular discrete displacement, and the second mirror group is a positive power. The transmission component is coupled to the digital signal processor and the second mirror assembly, and the digital signal processor utilizes the transmission component to control irregular discrete displacements of the second mirror.

在本發明中，該鏡頭總成可固定在總長度18mm內，同時該鏡頭總成在總長度固定的情況下可達到十倍以上之光學變焦。再者，該鏡頭總成之所有元件除該第二鏡組外，其餘元件皆為固定不動，不會有習知之鏡頭總成中齒輪磨損之問題。此外，利用該訊號處理器控制使得該第二鏡組以離散不規則方式位移可以提升該鏡頭總成之整體效能且達到最佳化。In the present invention, the lens assembly can be fixed within a total length of 18 mm, and the lens assembly can achieve optical zoom of more than ten times with a fixed total length. Moreover, all components of the lens assembly except the second mirror group are fixed, and there is no problem of gear wear in the conventional lens assembly. In addition, the use of the signal processor control to displace the second lens group in a discrete and irregular manner can improve the overall performance of the lens assembly and optimize it.

參考圖1，顯示本發明具有液態鏡頭之鏡頭總成之較佳實施例之示意圖。本發明具有液態鏡頭之鏡頭總成1可應用於微型電子裝置，例如應用於手機之微型相機系統。該鏡頭總成1依順序包括一第一鏡組10、一第一液態鏡頭20、一第二液態鏡頭30、一光柵40、一第二鏡組50、一數位訊號處理器(Digital Signal Processor,DSP)80及一傳動元件70。在本文之定義中，圖1之左側係為物端，圖1之右側係為像端，成像面60係位於圖中右側。Referring to Figure 1, there is shown a schematic view of a preferred embodiment of a lens assembly having a liquid lens of the present invention. The lens assembly 1 having a liquid lens of the present invention can be applied to a microelectronic device, such as a micro camera system applied to a mobile phone. The lens assembly 1 includes a first lens group 10, a first liquid lens 20, a second liquid lens 30, a grating 40, a second lens group 50, and a digital signal processor (Digital Signal Processor). DSP) 80 and a transmission component 70. In the definition herein, the left side of Figure 1 is the object end, the right side of Figure 1 is the image end, and the imaging surface 60 is located on the right side of the figure.

該第一鏡組10係為固定不動，其可以是正或負光焦度，而且其內之鏡片數目亦不限。在本實施例中，該第一鏡組10依序包括一第一透鏡11、一第二透鏡12及一第三透鏡13。該第一透鏡11係為正光焦度，該第二透鏡12係為負光焦度，該第三透鏡13係為正光焦度。較佳地，該第一透鏡11係為雙凸透鏡，該第二透鏡12係為雙凹透鏡，該第三透鏡13係為雙凸透鏡。The first lens group 10 is fixed, which may be positive or negative power, and the number of lenses therein is not limited. In this embodiment, the first lens group 10 sequentially includes a first lens 11 , a second lens 12 , and a third lens 13 . The first lens 11 is a positive power, the second lens 12 is a negative power, and the third lens 13 is a positive power. Preferably, the first lens 11 is a lenticular lens, the second lens 12 is a biconcave lens, and the third lens 13 is a lenticular lens.

該第一液態鏡頭20係為固定不動，且其係為正光焦度。該第一液態鏡頭20依序包括一第一玻璃層21、一第一液體層22、一第二液體層23及一第二玻璃層24。該第一液體層22及該第二液體層23係夾設於該第一玻璃層21及該第二玻璃層24之間。在本實施例中，該第一液體層22之材質係為油，該第二液體層23之材質係為水。該第一玻璃層21及該第二玻璃層24之材質相同(皆為BK7)，其折射率皆為1.51。The first liquid lens 20 is stationary and is of positive power. The first liquid lens 20 sequentially includes a first glass layer 21, a first liquid layer 22, a second liquid layer 23, and a second glass layer 24. The first liquid layer 22 and the second liquid layer 23 are interposed between the first glass layer 21 and the second glass layer 24 . In this embodiment, the material of the first liquid layer 22 is oil, and the material of the second liquid layer 23 is water. The first glass layer 21 and the second glass layer 24 are made of the same material (both BK7) and have a refractive index of 1.51.

該第一液態鏡頭20更包括一第一電極26及一第二電極27。當通電後，該第二液體層23之表面張力會受到影響，進而改變該第一液體層22及該第二液體層23間之界面25之曲率，而達到變焦之功效。The first liquid lens 20 further includes a first electrode 26 and a second electrode 27. When the current is applied, the surface tension of the second liquid layer 23 is affected, thereby changing the curvature of the interface 25 between the first liquid layer 22 and the second liquid layer 23 to achieve the effect of zooming.

該第二液態鏡頭30係為固定不動，且其係為負光焦度。該第二液態鏡頭30依序包括一第三玻璃層31、一第三液體層32、一第四液體層33及一第四玻璃層34。該第三液體層32及該第四液體層33係夾設於該第三玻璃層31及該第四玻璃層34之間。在本實施例中，該第三液體層32之材質係為油，該第四液體層33之材質係為水。該第三玻璃層31之折射率係大於該第一玻璃層21之折射率，該第四玻璃層34之折射率係大於該第二玻璃層24之折射率。在本實施例中，該第三玻璃層31及該第四玻璃層34之材質相同，其係為高折射玻璃，較佳地，其折射率皆大於1.8。The second liquid lens 30 is stationary and is negatively charged. The second liquid lens 30 sequentially includes a third glass layer 31, a third liquid layer 32, a fourth liquid layer 33, and a fourth glass layer 34. The third liquid layer 32 and the fourth liquid layer 33 are interposed between the third glass layer 31 and the fourth glass layer 34. In this embodiment, the material of the third liquid layer 32 is oil, and the material of the fourth liquid layer 33 is water. The refractive index of the third glass layer 31 is greater than the refractive index of the first glass layer 21, and the refractive index of the fourth glass layer 34 is greater than the refractive index of the second glass layer 24. In this embodiment, the third glass layer 31 and the fourth glass layer 34 are made of the same material, which is a high refractive glass, and preferably has a refractive index of more than 1.8.

該第二液態鏡頭30更包括一第三電極36及一第四電極37。當通電後，該第四液體層33之表面張力會受到影響，進而改變該第三液體層32及該第四液體層33間之界面35之曲率，而達到變焦之功效。在本發明中，該第一液態鏡頭20及該第二液態鏡頭30負擔70%以上的變焦功能。The second liquid lens 30 further includes a third electrode 36 and a fourth electrode 37. When the current is applied, the surface tension of the fourth liquid layer 33 is affected, thereby changing the curvature of the interface 35 between the third liquid layer 32 and the fourth liquid layer 33 to achieve the effect of zooming. In the present invention, the first liquid lens 20 and the second liquid lens 30 are subjected to a zoom function of 70% or more.

該光柵40係為固定不動，其係位於該第二液態鏡頭30及該第二鏡組50之間。The grating 40 is stationary and is located between the second liquid lens 30 and the second mirror 50.

該第二鏡組50係係可作不規則離散位移，其係為正光焦度，且其內之鏡片數目沒有限制。在本實施例中，該第二鏡組50依序包括一第四透鏡51、一第五透鏡52及一第六透鏡53。該第四透鏡51係為負光焦度，該第五透鏡52係為正光焦度，該第六透鏡53係為正光焦度。在本實施例中，該第四透鏡51係為雙凹透鏡，該第五透鏡52係為雙凸透鏡，該第六透鏡53係為雙凸透鏡。The second lens group 50 can be used as an irregular discrete displacement, which is a positive power, and the number of lenses therein is not limited. In this embodiment, the second lens group 50 sequentially includes a fourth lens 51, a fifth lens 52, and a sixth lens 53. The fourth lens 51 is a negative refractive power, the fifth lens 52 is a positive refractive power, and the sixth lens 53 is a positive refractive power. In the present embodiment, the fourth lens 51 is a biconcave lens, the fifth lens 52 is a lenticular lens, and the sixth lens 53 is a lenticular lens.

該傳動元件70係連接至該數位訊號處理器(Digital Signal Processor,DSP)80及該第二鏡組50。該數位訊號處理器80利用該傳動元件70以控制該第二鏡組50之不規則離散位移。該傳動元件70可以是一馬達(例如一步進馬達)。The transmission component 70 is coupled to the digital signal processor (DSP) 80 and the second mirror assembly 50. The digital signal processor 80 utilizes the transmission element 70 to control the irregular discrete displacement of the second mirror assembly 50. The transmission element 70 can be a motor (eg, a stepper motor).

在本發明中，該鏡頭總成1可固定在總長度18mm內，同時該鏡頭總成1在總長度固定的情況下可達到十倍以上之光學變焦。再者，該鏡頭總成1之所有元件除該第二鏡組50外，其餘元件皆為固定不動，不會有習知之鏡頭總成中齒輪磨損之問題。此外，利用該訊號處理器80控制該傳動元件70使得該第二鏡組50可以以離散不規則方式位移，因而提升該鏡頭總成1之整體效能且達到最佳化。In the present invention, the lens assembly 1 can be fixed within a total length of 18 mm, while the lens assembly 1 can achieve optical zoom of more than ten times with a fixed total length. Moreover, all the components of the lens assembly 1 except the second lens group 50 are fixed, and there is no problem of gear wear in the conventional lens assembly. In addition, the transmission component 70 is controlled by the signal processor 80 such that the second mirror assembly 50 can be displaced in discrete irregularities, thereby improving the overall performance of the lens assembly 1 and optimizing it.

在習知鏡頭總成之變焦鏡組中之所有鏡片之曲率皆為固定，其係利用該變焦鏡組(亦即可移動鏡組)的位移來達到光學變焦之效果，而該變焦鏡組於各焦段之位移係為連續規則性位移。因此該變焦鏡組之變焦曲線為一維變焦曲線，因此係以一維方式來尋找該變焦曲線最佳解。該變焦曲線最佳解即為找出該變焦鏡組於各焦段之位移，使該鏡頭總成於各焦段皆擁有最佳影像品質。The curvature of all the lenses in the zoom lens assembly of the conventional lens assembly is fixed, and the displacement of the zoom lens group (that is, the movable lens group) is used to achieve the optical zoom effect, and the zoom lens group is The displacement of each focal length is a continuous regular displacement. Therefore, the zoom curve of the zoom lens group is a one-dimensional zoom curve, so the optimal solution of the zoom curve is sought in a one-dimensional manner. The best solution of the zoom curve is to find the displacement of the zoom lens group in each focal length, so that the lens assembly has the best image quality in each focal length.

在本發明中，係利用該第一液態鏡頭20及該第二液態鏡頭30完成變焦，且該第一液態鏡頭20及該第二液態鏡頭30之曲率不為固定。此外，該數位訊號處理器80可以控制該傳動元件70使得該第二鏡組50達到不規則離散位移，因此變焦曲線最佳解彼此間為非連續關係，而可拓展為二維方式搜尋之。亦即，係利用該第一液態鏡頭20及該第二液態鏡頭30之曲率與該第二鏡組50位移之相對關係。In the present invention, the first liquid lens 20 and the second liquid lens 30 are used for zooming, and the curvatures of the first liquid lens 20 and the second liquid lens 30 are not fixed. In addition, the digital signal processor 80 can control the transmission component 70 such that the second mirror group 50 reaches an irregular discrete displacement, so that the optimal solutions of the zoom curves are discontinuous with each other, and can be expanded into a two-dimensional search. That is, the relative relationship between the curvature of the first liquid lens 20 and the second liquid lens 30 and the displacement of the second lens group 50 is utilized.

上述實施例僅為說明本發明之原理及其功效，並非限制本發明，因此習於此技術之人士對上述實施例進行修改及變化仍不脫本發明之精神。本發明之權利範圍應如後述之申請專利範圍所列。The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims.

1．．．本發明之鏡頭總成1. . . Lens assembly of the present invention

10．．．第一鏡組10. . . First mirror

11．．．第一透鏡11. . . First lens

12．．．第二透鏡12. . . Second lens

13．．．第三透鏡13. . . Third lens

20．．．第一液態鏡頭20. . . First liquid lens

21．．．第一玻璃層twenty one. . . First glass layer

22．．．第一液體層twenty two. . . First liquid layer

23．．．第二液體層twenty three. . . Second liquid layer

24．．．第二玻璃層twenty four. . . Second glass layer

25．．．界面25. . . interface

26．．．第一電極26. . . First electrode

27．．．第二電極27. . . Second electrode

30．．．第二液態鏡頭30. . . Second liquid lens

31．．．第三玻璃層31. . . Third glass layer

32．．．第三液體層32. . . Third liquid layer

33．．．第四液體層33. . . Fourth liquid layer

34．．．第四玻璃層34. . . Fourth glass layer

35．．．界面35. . . interface

36．．．第三電極36. . . Third electrode

37．．．第四電極37. . . Fourth electrode

40．．．光柵40. . . Grating

50．．．第二鏡組50. . . Second mirror

51．．．第四透鏡51. . . Fourth lens

52．．．第五透鏡52. . . Fifth lens

53．．．第六透鏡53. . . Sixth lens

60．．．成像面60. . . Imaging surface

70．．．傳動元件70. . . Transmission component

80．．．數位訊號處理器80. . . Digital signal processor

圖1顯示本發明具有液態鏡頭之鏡頭總成之較佳實施例之示意圖。BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing a preferred embodiment of a lens assembly having a liquid lens of the present invention.

1．．．本發明之鏡頭總成1. . . Lens assembly of the present invention

10．．．第一鏡組10. . . First mirror

11．．．第一透鏡11. . . First lens

12．．．第二透鏡12. . . Second lens

13．．．第三透鏡13. . . Third lens

20．．．第一液態鏡頭20. . . First liquid lens

21．．．第一玻璃層twenty one. . . First glass layer

22．．．第一液體層twenty two. . . First liquid layer

23．．．第二液體層twenty three. . . Second liquid layer

24．．．第二玻璃層twenty four. . . Second glass layer

25．．．界面25. . . interface

26．．．第一電極26. . . First electrode

27．．．第二電極27. . . Second electrode

30．．．第二液態鏡頭30. . . Second liquid lens

31．．．第三玻璃層31. . . Third glass layer

32．．．第三液體層32. . . Third liquid layer

33．．．第四液體層33. . . Fourth liquid layer

34．．．第四玻璃層34. . . Fourth glass layer

35．．．界面35. . . interface

40．．．光柵40. . . Grating

50．．．第二鏡組50. . . Second mirror

51．．．第四透鏡51. . . Fourth lens

52．．．第五透鏡52. . . Fifth lens

53．．．第六透鏡53. . . Sixth lens

60．．．成像面60. . . Imaging surface

70．．．傳動元件70. . . Transmission component

80．．．數位訊號處理器80. . . Digital signal processor

Claims

一種具有液態鏡頭之鏡頭總成，依序包括：一第一鏡組，係為固定不動；一第一液態鏡頭，係為固定不動，其依序包括一第一玻璃層、一第一液體層、一第二液體層及一第二玻璃層，該第一液態鏡頭係為正光焦度；一第二液態鏡頭，係為固定不動，其依序包括一第三玻璃層、一第三液體層、一第四液體層及一第四玻璃層，該第二液態鏡頭係為負光焦度，該第三玻璃層之折射率係大於該第一玻璃層之折射率，該第四玻璃層之折射率係大於該第二玻璃層之折射率，其中該第一液態鏡頭及該第二液態鏡頭負擔70%以上的變焦功能；一光柵，係為固定不動；一第二鏡組，係可作不規則離散位移，該第二鏡組係為正光焦度；一數位訊號處理器(Digital Signal Processor,DSP)；及一傳動元件，連接至該數位訊號處理器及該第二鏡組，該數位訊號處理器利用該傳動元件以控制該第二鏡組之不規則離散位移。A lens assembly having a liquid lens, comprising: a first mirror group, which is fixed; a first liquid lens, which is fixed, including a first glass layer and a first liquid layer in sequence a second liquid layer and a second glass layer, the first liquid lens is a positive power; a second liquid lens is fixed, and includes a third glass layer and a third liquid layer in sequence a fourth liquid layer and a fourth glass layer, wherein the second liquid lens is a negative refractive power, the third glass layer has a refractive index greater than a refractive index of the first glass layer, and the fourth glass layer The refractive index is greater than the refractive index of the second glass layer, wherein the first liquid lens and the second liquid lens bear a zoom function of 70% or more; a grating is fixed; a second lens group can be used Irregular discrete displacement, the second mirror is positive power; a digital signal processor (DSP); and a transmission component connected to the digital signal processor and the second mirror, the digit The signal processor uses the transmission component to control Irregular discrete displacement of the second lens group.

如請求項1之鏡頭總成，其中該第一鏡組係為正光焦度，其依序包括一第一透鏡、一第二透鏡及一第三透鏡，該第一透鏡係為正光焦度，該第二透鏡係為負光焦度，該第三透鏡係為正光焦度。The lens assembly of claim 1, wherein the first lens group is a positive power, and the sequence includes a first lens, a second lens and a third lens, wherein the first lens is a positive power. The second lens is a negative power, and the third lens is a positive power.

如請求項2之鏡頭總成，其中該第一透鏡係為雙凸透鏡，該第二透鏡係為雙凹透鏡，該第三透鏡係為雙凸透鏡。The lens assembly of claim 2, wherein the first lens is a lenticular lens and the second lens is a biconcave lens, the third lens being a lenticular lens.

如請求項1之鏡頭總成，其中該第一液體層之材質係為油，該第二液體層之材質係為水，該第三液體層之材質係為油，該第四液體層之材質係為水。The lens assembly of claim 1, wherein the material of the first liquid layer is oil, the material of the second liquid layer is water, the material of the third liquid layer is oil, and the material of the fourth liquid layer It is water.

如請求項1之鏡頭總成，其中該第一玻璃層及該第二玻璃層之材質相同，其折射率皆為1.51，該第三玻璃層及該第四玻璃層之材質相同，其折射率皆大於1.8。The lens assembly of claim 1, wherein the first glass layer and the second glass layer are made of the same material, and the refractive index thereof is 1.51, and the third glass layer and the fourth glass layer are made of the same material, and the refractive index thereof is the same. Both are greater than 1.8.

如請求項1之鏡頭總成，其中該第一液態鏡頭更包括一第一電極及一第二電極，使得當通電後，該第一電極及該第二電極可以改變該第一液體層及該第二液體層間之界面之曲率。The lens assembly of claim 1, wherein the first liquid lens further comprises a first electrode and a second electrode, such that when energized, the first electrode and the second electrode can change the first liquid layer and the The curvature of the interface between the second liquid layers.

如請求項1之鏡頭總成，其中該第二液態鏡頭更包括一第三電極及一第四電極，使得當通電後，該第三電極及該第四電極可以改變該第三液體層及該第四液體層間之界面之曲率。The lens assembly of claim 1, wherein the second liquid lens further comprises a third electrode and a fourth electrode, such that when energized, the third electrode and the fourth electrode can change the third liquid layer and the The curvature of the interface between the fourth liquid layers.

如請求項1之鏡頭總成，其中該第二鏡組依序包括一第四透鏡、一第五透鏡及一第六透鏡，該第四透鏡係為負光焦度，該第五透鏡係為正光焦度，該第六透鏡係為正光焦度。The lens assembly of claim 1, wherein the second lens group sequentially includes a fourth lens, a fifth lens and a sixth lens, wherein the fourth lens is a negative optical power, and the fifth lens is Positive power, the sixth lens is positive power.

如請求項1之鏡頭總成，其中該傳動元件係為一馬達。The lens assembly of claim 1, wherein the transmission element is a motor.