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                                                                                  長春佳福光電子有限公司致力于球面透鏡、棱鏡、窗口片、柱面鏡、反射鏡及相關產品高精度加工.

                                                                                  旺旺號:jiafuguangdian
                                                                                  設計
                                                                                  數碼相機
                                                                                   數碼相機系統
                                                                                  相機的鏡頭是相機成像的關鍵。數碼相機鏡頭的質量在一定程度上決定了其成像質量。   一、影響鏡頭質量的因素      目前,數字相機的鏡頭所采用的材質有磨光玻璃和透明塑料兩種。這兩種材質各有特點,磨光玻璃的透光程度略好,而透明塑料有重量輕的優勢。一般人可能都會認為選用玻璃材質作為鏡頭的數字相機一定會比透明塑料鏡頭的相機投影更清晰,性能更優良,其實不然,由于數字相機鏡頭的結構非常復雜,因此,所采用的透鏡組合、設計方案及制作工藝才是鏡頭質量優劣的關鍵。如果制作工藝考究,磨光玻璃和透明塑料在透光性方面不會有太大差別。     雖然從理論上講,數字相機的CCD只需要一片透鏡就可以,但在實際的應用中由于透鏡的球差、色差等諸多原因,嚴重影響成像的質量。為了提高圖像質量,在數字相機的鏡頭中需要設計有不同功能的透鏡組合,但如果透鏡過多勢必會影響景物投射到CCD時的清晰度。所以說,透鏡的制作工藝和透鏡組合的設計方案十分重要。除了材質方面的因素外,還要注意鏡頭其他方面的因素,例如焦距、變焦、光圈和快門等方面。 
                                                                                   1.焦距      焦距是鏡頭的另一項重點因素,首先,了解什么是焦距??梢园褦底窒鄼C的鏡頭看作是一組透鏡,當平行光線穿過透鏡時,將會聚到一點上,這個點叫做焦點,而焦點到透鏡中心的距離,稱為焦距。      焦距固定的鏡頭,即為定焦鏡頭;焦距可以調節變化的鏡頭,就是變焦鏡頭。在攝影領域中,焦距主要反映鏡頭視角的大小。對于傳統135相機而言,50mm左右的鏡頭的視角與人眼接近,拍攝時不變形,稱為標準鏡頭。一般涵蓋40mm-70mm的范圍,18mm-40mm.的鏡頭被稱為短焦鏡頭也叫廣角鏡頭, 70mm-135mm稱為中焦鏡頭,135mm-500mm稱為長焦鏡頭,500mm以上稱為望遠鏡頭,18 mm以下則稱為超廣角鏡頭或魚眼鏡頭。這種范圍的劃分只是人們的習慣,并沒有嚴格的定義。數碼相機的CCD一般比135膠片小得多,所以,相同視角,其鏡頭焦距也短很多,例如,使用0.33"CCD的數碼相機,使用約13 mm的鏡頭,其視角大概相當于135相機50mm的標準鏡頭。由于各數碼相機生產廠商所采用的CCD規格型號不同,所以,大家都采用“相當于35mm相機(即135相機)焦距”的說法。     通常,在數字相機的技術參數中會有F和f的表示,其中F代表最大光圈值,f則代表焦距長度。例如,標有f=8-24,相當于135mm相機的38mm-115mm。   
                                                                                  2.變焦      變焦能力也是數字相機鏡頭的設計重點。數字相機的變焦一般分為光學變焦和數字變焦兩種。光學變焦就是和傳統的光學成像相機一樣,通過鏡頭的伸縮組合來實現變焦,這也是真正意義上的變焦。     但光學變焦鏡頭的成本較高,而且非常復雜。復雜的變焦鏡頭體積一般都過于龐大,這一點對于體積趨于小型化的數字相機來說,并不適用。因此,目前市場上主流的數字相機的光學變焦大多為3倍左右。為企業提供專業的光學產品及技術解決方案。
                                                                                  光學成像系統設計:
                                                                                  數碼相機鏡頭、安防鏡頭、紅外成像鏡頭、望遠鏡、指紋儀成像鏡頭、車載鏡頭、汽車四輪定位鏡頭、激光擴束鏡、激光準直鏡頭、投影鏡頭、遠心鏡頭等等。
                                                                                  光學成像系統設計:
                                                                                  數碼相機鏡頭、安防鏡頭、紅外成像鏡頭、望遠鏡、指紋儀成像鏡頭、車載鏡頭、汽車四輪定位鏡頭、激光擴束鏡、激光準直鏡頭、投影鏡頭、遠心鏡頭等等。
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