TWI617856B - Lens group correction method - Google Patents
Lens group correction method Download PDFInfo
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- TWI617856B TWI617856B TW104144022A TW104144022A TWI617856B TW I617856 B TWI617856 B TW I617856B TW 104144022 A TW104144022 A TW 104144022A TW 104144022 A TW104144022 A TW 104144022A TW I617856 B TWI617856 B TW I617856B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Abstract
本發明鏡頭組校正方法中,主要先讓光源的光線通過鏡頭利用,並對準投射到光感測器感測,而感測出投影圖案,接著基於標準投影圖案與所感測到的投影圖案之間的差距,調整鏡頭承載座中鏡頭的所在位置,直到標準投影圖案與所感測到的投影圖案之間的差距在預定範圍之內,讓每個鏡頭都與標準鏡頭具有相同的光學特性。其中,鏡頭組由鏡頭承載座與鏡頭所組成,而鏡頭承載座與鏡頭之間具有結合結構,使得鏡頭得以沿著結合結構在鏡頭承載座內被移動。 In the lens group correction method of the present invention, the light from the light source is mainly used through the lens, and is projected onto the light sensor to sense the projection pattern, and then based on the standard projection pattern and the detected projection pattern, Adjust the position of the lens in the lens carrier until the gap between the standard projection pattern and the sensed projection pattern is within a predetermined range, so that each lens has the same optical characteristics as the standard lens. The lens group is composed of a lens holder and a lens, and the lens holder has a coupling structure with the lens, so that the lens can be moved within the lens holder along the combination structure.
Description
本發明係關於一種音圈馬達;特別關於一種鏡頭組校正方法。 The invention relates to a voice coil motor; in particular, to a lens group correction method.
為了對鏡頭組或硬碟的磁頭臂做精密的定位控制,通常都會採用音圈馬達(Voice Coil Motor,VCM)來移動鏡頭組或硬碟的磁頭臂。音圈馬達的機構,主要是將線圈置放於含有永久磁鐵之磁路內。 In order to precisely control the head arm of the lens group or hard disk, a voice coil motor (VCM) is usually used to move the head arm of the lens group or hard disk. The mechanism of the voice coil motor is mainly to place the coil in a magnetic circuit containing a permanent magnet.
在光學系統中,當電流通過線圈時就會與永久磁鐵構成之磁場根據弗萊明左手定則產生交互作用之推進力,使得剛性連接永久磁鐵的承座被移動,同時帶動固定在鏡頭承載座上的鏡頭,而達到光學變焦、對焦的目的。 In the optical system, when the current passes through the coil, the magnetic field formed by the permanent magnet will generate an interactive propulsive force according to Fleming's left-hand rule, so that the holder rigidly connected to the permanent magnet is moved, and at the same time, it is fixed to the lens holder To achieve the purpose of optical zoom and focus.
只是,在量產過程中,難免會有公差,導致同一型號的每個鏡頭組的光學性能與外觀大小有落差,而需要依據標準鏡頭組進行校正。更具體來說,未經校正過的鏡頭組中,其鏡頭的初始位置若不一致的話,除了影響整體音圈馬達的外觀高度,還會導致音圈馬達間的焦段有差異。 However, in the process of mass production, tolerances will inevitably be caused, resulting in a difference in the optical performance and appearance of each lens group of the same model, which needs to be corrected according to the standard lens group. More specifically, if the initial positions of the lenses in the uncorrected lens group are inconsistent, in addition to affecting the overall height of the voice coil motor, it will also cause a difference in focal length between the voice coil motors.
習知的校正手段中,通常都是用目測鏡頭在鏡頭承載座之中的初始位置,比較鏡頭承載外部座頂部與鏡頭頂部之間的高低落差,然後再調整鏡頭的位置到與標準鏡頭相當的程度。然而,這種量測方式除了麻煩以外,也很容易因為鏡頭承載外部座頂部本身就有公差,導致校正結果不夠理想。 In the conventional correction methods, the initial position of the lens in the lens holder is usually measured by comparing the height difference between the top of the lens holder and the top of the lens, and then the position of the lens is adjusted to be equivalent to that of a standard lens. degree. However, in addition to the trouble of this measurement method, it is also easy because the lens itself has tolerances on the top of the external mount, which results in unsatisfactory correction results.
為此,本發明之主要目的在提供一種鏡頭組校正方法,其主要比較標準 鏡頭與待調整鏡頭之間的投影圖案中直徑的差異值,而將待調整鏡頭作向上或向下調整,直到上述差異值為可以接受的程度。 For this reason, the main purpose of the present invention is to provide a lens group correction method, which mainly compares the standard The difference in diameter in the projection pattern between the lens and the lens to be adjusted, and the lens to be adjusted is adjusted upward or downward until the difference is acceptable.
基於上述目的,本發明鏡頭組校正方法中,主要先讓光源的光線通過鏡頭,利用該光線並對準投射到光感測器感測,而感測出投影圖案,接著基於標準投影圖案與所感測到的投影圖案之間的差距,調整鏡頭承載座中鏡頭的所在位置,直到標準投影圖案與所感測到的投影圖案之間的差距在預定範圍之內,讓每個鏡頭都與標準鏡頭具有相同的光學特性。其中,鏡頭組由鏡頭承載座與鏡頭所組成,而鏡頭承載座與鏡頭之間具有結合結構,使得鏡頭得以沿著結合結構在鏡頭承載座內被移動。關於本創作之優點與精神可以藉由以下的新型詳述及所附圖式得到進一步的瞭解。 Based on the above purpose, in the lens group correction method of the present invention, the light from the light source is first passed through the lens, and the light is aligned and projected onto the light sensor to sense the projection pattern, and then based on the standard projection pattern and the sensed Adjust the gap between the measured projection patterns, and adjust the position of the lens in the lens carrier until the gap between the standard projection pattern and the sensed projection pattern is within a predetermined range, so that each lens has a standard lens. Same optical characteristics. The lens group is composed of a lens holder and a lens, and the lens holder has a coupling structure with the lens, so that the lens can be moved within the lens holder along the combination structure. The advantages and spirit of this creation can be further understood through the following new detailed description and attached drawings.
30‧‧‧底座 30‧‧‧ base
60a、60b‧‧‧光線 60a, 60b‧‧‧light
70‧‧‧鏡頭承載座 70‧‧‧ lens mount
701、702‧‧‧抵靠結構 701, 702‧‧‧Abutment structure
705‧‧‧開口 705‧‧‧ opening
706‧‧‧母螺紋 706‧‧‧female thread
80‧‧‧鏡頭 80‧‧‧ lens
801、802‧‧‧導引軸 801, 802‧‧‧guide shaft
803‧‧‧調整爪 803‧‧‧adjusting claw
90‧‧‧光源 90‧‧‧ light source
100‧‧‧光感測器 100‧‧‧light sensor
101‧‧‧標準投影圖案 101‧‧‧standard projection pattern
101a‧‧‧直徑線條 101a‧‧‧ diameter line
102‧‧‧投影圖案 102‧‧‧ Projection pattern
102a‧‧‧直徑線條 102a‧‧‧diameter line
103‧‧‧中心點 103‧‧‧center
第1A~1B圖係本發明音圈馬達之示意圖。 Figures 1A ~ 1B are schematic diagrams of the voice coil motor of the present invention.
第2圖係本發明鏡頭組校正方法之示意圖。 FIG. 2 is a schematic diagram of a lens group correction method of the present invention.
第3A~3B圖係本發明鏡頭組校正方法之另一示意圖。 3A ~ 3B are another schematic diagram of the lens group correction method of the present invention.
請參考第1A~1B圖,第1A~1B圖係本發明音圈馬達之示意圖。如第1A~1B圖所示,本發明音圈馬達包含底座30、固定在底座30上的一組導引軸801與802、固定電路部件(未描繪;主要由線圈所構成)、鏡頭承載座70(包含有感磁元件(未描繪)且剛性連接有鏡頭80(如第2圖))。為了讓鏡頭承載座70可以沿著該組導引軸801與802作上下的垂直移動,鏡頭承載座70的外部具有第一抵靠結構701與第二抵靠結構702,而第一抵靠結構701與第二抵靠 結構702在位置設置上有對稱性。其中,鏡頭承載座70的開口705可安裝鏡頭80,並且在鏡頭承載座70與鏡頭80之間具有結合結構,使得鏡頭80得以沿著結合結構在鏡頭承載座70內被微幅上下移動。舉例來說,該結合結構為公母螺紋時,鏡頭承載座70的內側壁面具有母螺紋706,而鏡頭80則有相對的公螺紋,因此只要順著公母螺紋而旋轉鏡頭80,即可鏡頭80讓被微幅上下移動。 Please refer to FIGS. 1A to 1B, which are schematic diagrams of the voice coil motor of the present invention. As shown in FIGS. 1A to 1B, the voice coil motor of the present invention includes a base 30, a set of guide shafts 801 and 802 fixed on the base 30, fixed circuit components (not shown; mainly composed of a coil), and a lens bearing base. 70 (including a magnetic sensor (not shown) and a lens 80 rigidly connected (as shown in FIG. 2)). In order to allow the lens carrier 70 to vertically move up and down along the guide shafts 801 and 802, the lens carrier 70 has a first abutment structure 701 and a second abutment structure 702 outside the first abutment structure. 701 and second abut The structure 702 is symmetrical in position setting. The opening 705 of the lens carrier 70 can be used to mount the lens 80 and has a coupling structure between the lens carrier 70 and the lens 80, so that the lens 80 can be slightly moved up and down in the lens carrier 70 along the coupling structure. For example, when the coupling structure is a male-female thread, the inner wall surface of the lens carrier 70 has a female thread 706, and the lens 80 has a corresponding male thread, so as long as the lens 80 is rotated along the male-female thread, the lens can be 80 let the quilt move up and down slightly.
請參考第2圖,第2圖係本發明鏡頭組校正方法之示意圖。如第2圖所示,為了實施本發明鏡頭組校正方法,需要先準備有光源90、額外安裝在鏡頭80的調整爪803、以及光感測器100(例如CCD或CMOS)。其中,只要手指抓著調整爪803,就能順著公母螺紋而旋轉鏡頭80,即可鏡頭80讓被微幅上下移動。 Please refer to FIG. 2, which is a schematic diagram of the lens group correction method of the present invention. As shown in FIG. 2, in order to implement the lens group correction method of the present invention, a light source 90, an adjustment claw 803 additionally mounted on the lens 80, and a light sensor 100 (such as a CCD or CMOS) need to be prepared. Among them, as long as the fingers hold the adjusting claw 803, the lens 80 can be rotated along the male and female threads, and the lens 80 can be moved up and down slightly.
在實施校正方法之前,需要將光源90的光線60a平行於鏡頭80射入,並且在鏡頭80的正下方放置光感測器100,以便感測光線60b通過鏡頭80後所投射出的投影圖案102(如第3A或3B圖)。最後,在利用標準投影圖案101作為基礎,比較所投射出的投影圖案102的偏差程度,再調整鏡頭80的所在位置,而讓每個待檢測的鏡頭80都具有相同的光學性能。 Before implementing the correction method, the light 60a of the light source 90 needs to be incident parallel to the lens 80, and a light sensor 100 is placed directly below the lens 80 to sense the projection pattern 102 projected by the light 60b after passing through the lens 80. (As in Figure 3A or 3B). Finally, the standard projection pattern 101 is used as a basis, the degree of deviation of the projected projection pattern 102 is compared, and the position of the lens 80 is adjusted, so that each lens 80 to be detected has the same optical performance.
在實際進行檢測之前,需要先提供標準投影圖案,意即先將特定鏡頭以傳統的手段調出符合規格的光學性能,然後再以如第2圖所示的架構下,以光感測器100取得相對的投影圖案,並將之定義成標準投影圖案101。底下,將更具體的說明調整原則。 Before the actual detection, a standard projection pattern needs to be provided, which means that a specific lens is first adjusted to meet the optical performance in accordance with the specifications by traditional means, and then the light sensor 100 is used with the architecture shown in Figure 2 Obtain the relative projection pattern and define it as the standard projection pattern 101. Below, the principle of adjustment will be explained in more detail.
請參閱第3A~3B圖,第3A~3B圖係本發明鏡頭組校正方法之另一示意圖。如第1A~1B圖所示,在本發明鏡頭組校正方法中,主要是基於標準投 影圖案101與所感測到的投影圖案102之間的差距,調整鏡頭承載座70中鏡頭80的所在位置,直到標準投影圖案101與所感測到的投影圖案102之間的差距在預定範圍之內。 Please refer to FIGS. 3A to 3B, which are another schematic diagram of the lens group correction method of the present invention. As shown in Figures 1A ~ 1B, in the lens group correction method of the present invention, it is mainly based on the standard projection The gap between the shadow pattern 101 and the sensed projection pattern 102, adjust the position of the lens 80 in the lens carrier 70 until the gap between the standard projection pattern 101 and the sensed projection pattern 102 is within a predetermined range .
具體來說如第3A圖所示,所感測到的該投影圖案102大於標準投影圖案101時,鏡頭承載座102中鏡頭80被調整成朝向光感測器100所在位置移動(也就是向下移動),直到標準投影圖案101與所感測到的投影圖案102之間的差距在預定範圍之內。如第3B圖所示,所感測到的該投影圖案102大於標準投影圖案101時,鏡頭承載座102中鏡頭80被調整成朝向提供光線60a之光源90所在位置移動(也就是向上移動),直到標準投影圖案101與所感測到的投影圖案102之間的差距在預定範圍之內。 Specifically, as shown in FIG. 3A, when the sensed projection pattern 102 is larger than the standard projection pattern 101, the lens 80 in the lens holder 102 is adjusted to move toward the position of the light sensor 100 (that is, move downward). ) Until the gap between the standard projection pattern 101 and the sensed projection pattern 102 is within a predetermined range. As shown in FIG. 3B, when the sensed projection pattern 102 is larger than the standard projection pattern 101, the lens 80 in the lens carrier 102 is adjusted to move toward the position of the light source 90 that provides the light 60a (that is, moves upward) until The gap between the standard projection pattern 101 and the sensed projection pattern 102 is within a predetermined range.
投影圖案102與標準投影圖案101之間的大小比較方式會有很多種,例如比較面積,但為了簡化比較手段,可以只比較投影圖案102與標準投影圖案101的直徑,意即只比較單一條通過中心點103的直徑線條101a、102a。如果考慮到光感測器100解析度不夠精密所導致的誤差,導致投影圖案102與標準投影圖案101的邊緣不夠圓滑,不見得能呈現完美的正圓形(每條通過中心點103的直徑線條101a、102a的長度均為相同),可以同時比較數條直徑線條101a、102a。也就是,數條直徑線條101a、102a的長度都一致時,則將該長度視為投影圖案102與標準投影圖案101的直徑長度。如果數條直徑線條101a、102a中,有少數幾條長度有落差時,則剔除有偏差的部分,以數量上較多者作為投影圖案102與標準投影圖案101的直徑長度。 There are many ways to compare the size of the projection pattern 102 and the standard projection pattern 101, such as comparing the area. However, in order to simplify the comparison method, only the diameters of the projection pattern 102 and the standard projection pattern 101 can be compared, which means that only a single pass is compared. The center point 103 has diameter lines 101a and 102a. If the error caused by the insufficient resolution of the light sensor 100 is taken into account, the edges of the projection pattern 102 and the standard projection pattern 101 are not smooth enough, and it may not be able to present a perfect perfect circle (each diameter line passing through the center point 103) The lengths of 101a and 102a are the same), and several diameter lines 101a and 102a can be compared at the same time. That is, when the lengths of the plurality of diameter lines 101a and 102a are the same, the length is regarded as the diameter length of the projection pattern 102 and the standard projection pattern 101. If a few of the diameter lines 101a and 102a have a difference in length, the deviation is eliminated, and the larger number is used as the diameter length of the projection pattern 102 and the standard projection pattern 101.
舉例來說,如第1A~1B圖所示,標準投影圖案101與所感測到的投影圖案102均被定義有中心點103、以及通過中心點103之直徑線條101a、102a。 其中,直徑線條101a、102a的兩端碰觸均到標準投影圖案101與所感測到的投影圖案102的兩個邊緣,因此從這兩端的座標可以推算出直徑線條101a、102a的長度。因此,為了讓每個鏡頭80都具有相同光學性能,標準投影圖案101的直徑線條101a與所感測到的投影圖案102的直徑線條102a之間的差距必須在預定範圍之內。其中,預定範圍為-0.02mm~0.02mm,而最佳為-0.01mm~0.01mm。如果這個差距沒在上述預定範圍之內就需要調整鏡頭80在鏡頭承載座70內的所在位置。 For example, as shown in FIGS. 1A to 1B, the standard projection pattern 101 and the sensed projection pattern 102 are each defined with a center point 103 and diameter lines 101 a and 102 a passing through the center point 103. Wherein, both ends of the diameter lines 101a and 102a touch both edges of the standard projection pattern 101 and the sensed projection pattern 102. Therefore, the lengths of the diameter lines 101a and 102a can be calculated from the coordinates of the two ends. Therefore, in order for each lens 80 to have the same optical performance, the gap between the diameter line 101a of the standard projection pattern 101 and the diameter line 102a of the sensed projection pattern 102 must be within a predetermined range. Among them, the predetermined range is -0.02mm ~ 0.02mm, and the most preferable range is -0.01mm ~ 0.01mm. If the difference is not within the predetermined range, the position of the lens 80 in the lens bearing base 70 needs to be adjusted.
具體來說,具體來說如第3A圖所示,所感測到的該投影圖案102的直徑線條102a大於標準投影圖案101的直徑線條101a時,鏡頭承載座102中鏡頭80被調整成朝向光感測器100所在位置移動(也就是向下移動),直到標準投影圖案101的直徑線條101a與所感測到的投影圖案102的直徑線條102a之間的差距在預定範圍之內。如第3B圖所示,所感測到的該投影圖案102的直徑線條102a大於標準投影圖案101的直徑線條101a時,鏡頭承載座102中鏡頭80被調整成朝向提供光線60a之光源90所在位置移動(也就是向上移動),直到標準投影圖案101的直徑線條101a與所感測到的投影圖案102的直徑線條102a之間的差距在預定範圍之內。 Specifically, as shown in FIG. 3A, when the sensed diameter line 102 a of the projection pattern 102 is larger than the diameter line 101 a of the standard projection pattern 101, the lens 80 in the lens carrier 102 is adjusted to face the light. The position of the detector 100 is moved (that is, moved downward) until the gap between the diameter line 101a of the standard projection pattern 101 and the diameter line 102a of the sensed projection pattern 102 is within a predetermined range. As shown in FIG. 3B, when the sensed diameter line 102a of the projection pattern 102 is larger than the diameter line 101a of the standard projection pattern 101, the lens 80 in the lens mount 102 is adjusted to move toward the position of the light source 90 providing the light 60a. (Ie, moving upward) until the gap between the diameter line 101a of the standard projection pattern 101 and the sensed diameter line 102a of the projection pattern 102 is within a predetermined range.
藉由以上較佳具體實施例之詳述,係希望能更加清楚描述本創作之特徵與精神,而並非以上述所揭露的較佳具體實施例來對本創作之範疇加以限制。相反地,其目的是希望能涵蓋各種改變及具相等性的安排於本創作所欲申請之專利範圍的範疇內。 With the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the creation can be described more clearly, rather than limiting the scope of the creation with the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equitable arrangements within the scope of the patents that this creation intends to apply for.
60a、60b‧‧‧光線 60a, 60b‧‧‧light
70‧‧‧鏡頭承載座 70‧‧‧ lens mount
80‧‧‧鏡頭 80‧‧‧ lens
803‧‧‧調整爪 803‧‧‧adjusting claw
90‧‧‧光源 90‧‧‧ light source
100‧‧‧光感測器 100‧‧‧light sensor
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CN107728421B (en) * | 2017-11-05 | 2020-08-25 | 信利光电股份有限公司 | Multispectral calibration method and calibration system for multi-camera module |
CN109188836B (en) * | 2018-09-19 | 2021-01-29 | 深圳睿晟自动化技术有限公司 | Method for correcting center point of light source pattern to central axis of projection optical device |
US11070709B2 (en) * | 2019-04-12 | 2021-07-20 | Asm Technology Singapore Pte Ltd | Aligning an image sensor relative to a lens module |
CN111399166B (en) * | 2020-06-05 | 2020-09-08 | 苏州微影激光技术有限公司 | Pre-adjustment apparatus, pre-adjustment method, and exposure apparatus assembly method |
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