本發(fa)明涉及(ji)光學鏡頭，尤其涉及(ji)一種定焦鏡頭。

背景技術：

1、隨著互聯網(wang)技(ji)術的不斷升級發展(zhan)，對于定焦(jiao)鏡頭的品質追求也越來越高(gao)(gao)。在視(shi)(shi)頻(pin)(pin)會議、網(wang)絡視(shi)(shi)頻(pin)(pin)拍(pai)攝、車載鏡頭或(huo)監(jian)控(kong)器等領域均需要能拍(pai)攝清晰度高(gao)(gao)、成像品質好、畸變低(di)、總長短以及(ji)成本低(di)的定焦(jiao)鏡頭。

2、但目前的定焦鏡頭(tou)透鏡配置形式較難對系統像差(cha)做良(liang)好的補正，存在成像品質差(cha)、畸變(bian)高等問題，并且鏡頭(tou)光學(xue)總長一般都大于24mm，總長較長，使得鏡頭(tou)的體積過大，相應墊圈等尺寸也較大，增加了鏡頭(tou)的整體成本。

技術實現思路

1、本發明提供(gong)了(le)一種定焦鏡頭，采用4g4p組合，能夠很好的校正像差，減小(xiao)畸變，同時保證足夠好的像質，提高分辨(bian)率(lv)，光學總長小(xiao)于(yu)或等(deng)于(yu)15mm。

2、為(wei)(wei)實現上述(shu)(shu)(shu)目的(de)(de)，本(ben)發(fa)明實施例(li)提(ti)出了一(yi)(yi)種(zhong)定焦(jiao)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)頭(tou)，包括(kuo)：沿光(guang)(guang)軸從物方到像(xiang)方依次排列的(de)(de)光(guang)(guang)焦(jiao)度(du)(du)(du)為(wei)(wei)負(fu)的(de)(de)第(di)(di)(di)一(yi)(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、光(guang)(guang)焦(jiao)度(du)(du)(du)為(wei)(wei)負(fu)的(de)(de)第(di)(di)(di)二透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、光(guang)(guang)焦(jiao)度(du)(du)(du)為(wei)(wei)負(fu)的(de)(de)第(di)(di)(di)三透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、光(guang)(guang)闌、光(guang)(guang)焦(jiao)度(du)(du)(du)為(wei)(wei)正(zheng)的(de)(de)第(di)(di)(di)四透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、光(guang)(guang)焦(jiao)度(du)(du)(du)為(wei)(wei)負(fu)的(de)(de)第(di)(di)(di)五透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、光(guang)(guang)焦(jiao)度(du)(du)(du)為(wei)(wei)正(zheng)的(de)(de)第(di)(di)(di)六透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、光(guang)(guang)焦(jiao)度(du)(du)(du)為(wei)(wei)正(zheng)的(de)(de)第(di)(di)(di)七透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、光(guang)(guang)焦(jiao)度(du)(du)(du)為(wei)(wei)負(fu)的(de)(de)第(di)(di)(di)八透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)；其中，所(suo)述(shu)(shu)(shu)第(di)(di)(di)五透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)和(he)所(suo)述(shu)(shu)(shu)第(di)(di)(di)六透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)膠合(he)；所(suo)述(shu)(shu)(shu)第(di)(di)(di)一(yi)(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、所(suo)述(shu)(shu)(shu)第(di)(di)(di)四透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、所(suo)述(shu)(shu)(shu)第(di)(di)(di)五透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、所(suo)述(shu)(shu)(shu)第(di)(di)(di)六透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)均為(wei)(wei)玻璃球面(mian)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)，所(suo)述(shu)(shu)(shu)第(di)(di)(di)二透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、所(suo)述(shu)(shu)(shu)第(di)(di)(di)三透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)、所(suo)述(shu)(shu)(shu)第(di)(di)(di)七透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)和(he)所(suo)述(shu)(shu)(shu)第(di)(di)(di)八透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)均為(wei)(wei)塑膠非球面(mian)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)。

3、可(ke)選地，沿光軸從(cong)物(wu)方(fang)到(dao)像(xiang)(xiang)方(fang)的(de)方(fang)向上，所(suo)述(shu)(shu)(shu)第(di)(di)(di)一透(tou)鏡(jing)的(de)物(wu)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，像(xiang)(xiang)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凹(ao)(ao)(ao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)；所(suo)述(shu)(shu)(shu)第(di)(di)(di)二透(tou)鏡(jing)的(de)物(wu)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凹(ao)(ao)(ao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，像(xiang)(xiang)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)；所(suo)述(shu)(shu)(shu)第(di)(di)(di)三(san)透(tou)鏡(jing)的(de)物(wu)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，像(xiang)(xiang)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凹(ao)(ao)(ao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)；所(suo)述(shu)(shu)(shu)第(di)(di)(di)四透(tou)鏡(jing)的(de)物(wu)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，像(xiang)(xiang)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)；所(suo)述(shu)(shu)(shu)第(di)(di)(di)五透(tou)鏡(jing)的(de)物(wu)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，像(xiang)(xiang)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凹(ao)(ao)(ao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)；所(suo)述(shu)(shu)(shu)第(di)(di)(di)六透(tou)鏡(jing)的(de)物(wu)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，像(xiang)(xiang)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)；所(suo)述(shu)(shu)(shu)第(di)(di)(di)七透(tou)鏡(jing)的(de)物(wu)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凹(ao)(ao)(ao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，像(xiang)(xiang)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)；所(suo)述(shu)(shu)(shu)第(di)(di)(di)八(ba)透(tou)鏡(jing)的(de)物(wu)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凸(tu)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，像(xiang)(xiang)側(ce)(ce)(ce)(ce)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)為(wei)(wei)(wei)(wei)凹(ao)(ao)(ao)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)。

4、可選地，所(suo)述第五(wu)透鏡的折射(she)率n5和(he)所(suo)述第六透鏡的折射(she)率n6滿足(zu)關(guan)系式：0.05≤|n5-n6|≤0.20。

5、可選地(di)，所(suo)述(shu)(shu)(shu)第一(yi)透(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)(de)阿(a)貝數v1、所(suo)述(shu)(shu)(shu)第二(er)透(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)(de)阿(a)貝數v2、所(suo)述(shu)(shu)(shu)第三透(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)(de)阿(a)貝數v3、所(suo)述(shu)(shu)(shu)第四透(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)(de)阿(a)貝數v4、所(suo)述(shu)(shu)(shu)第五透(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)(de)阿(a)貝數v5、所(suo)述(shu)(shu)(shu)第六(liu)透(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)(de)阿(a)貝數v6、所(suo)述(shu)(shu)(shu)第七(qi)透(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)(de)阿(a)貝數v7和所(suo)述(shu)(shu)(shu)第八透(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)(de)阿(a)貝數v8滿足以下(xia)關系式：v2+v3+v8≥70.000；|v3-v5|≥4.000；v4+v5+v6+v7≤230.000；v3+v5+v7≤150.000；v2+v3+v4+v5≤200.00；|v1-v8|≤50.000；|v2-v5|≤15.000；20.0≤|v5-v6|≤40.0。

6、可選(xuan)地，所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)一(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)至(zhi)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)八(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)滿足以下(xia)關(guan)系式(shi)：(t1+t8)/t3≥0.75；(t7+g78+t8)/(g45+t5+g67)≥0.9；(t1+g23)/(g12+g78)≥0.2；(t3+t6)/t8≤5.200；其中(zhong)，t1為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)一(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)中(zhong)心厚(hou)(hou)(hou)度；t3為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)三透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)中(zhong)心厚(hou)(hou)(hou)度；t5為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)五透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)中(zhong)心厚(hou)(hou)(hou)度；t6為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)六(liu)(liu)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)中(zhong)心厚(hou)(hou)(hou)度；t7為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)七(qi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)中(zhong)心厚(hou)(hou)(hou)度；t8為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)八(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)的(de)(de)中(zhong)心厚(hou)(hou)(hou)度；g12為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)一(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和(he)(he)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)二透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)之(zhi)間的(de)(de)空(kong)(kong)氣間隔；g23為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)二透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和(he)(he)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)三透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)之(zhi)間的(de)(de)空(kong)(kong)氣間隔；g45為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)四透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和(he)(he)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)五透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)之(zhi)間的(de)(de)空(kong)(kong)氣間隔；g67為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)六(liu)(liu)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和(he)(he)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)七(qi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)之(zhi)間的(de)(de)空(kong)(kong)氣間隔；g78為(wei)(wei)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)七(qi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和(he)(he)所(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)八(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)之(zhi)間的(de)(de)空(kong)(kong)氣間隔。

7、可選地(di)，所(suo)(suo)(suo)述(shu)(shu)(shu)第一透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)至所(suo)(suo)(suo)述(shu)(shu)(shu)第八透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)滿足(zu)以下關系式(shi)：(g45+g78+efl)/(t3+t5)≥2.300；efl/(g12+t2+g45)≥1.20；其(qi)中(zhong)(zhong)，t2為(wei)所(suo)(suo)(suo)述(shu)(shu)(shu)第二(er)(er)透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)心厚(hou)(hou)度；t3為(wei)所(suo)(suo)(suo)述(shu)(shu)(shu)第三透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)心厚(hou)(hou)度；t5為(wei)所(suo)(suo)(suo)述(shu)(shu)(shu)第五(wu)透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)心厚(hou)(hou)度；g12為(wei)所(suo)(suo)(suo)述(shu)(shu)(shu)第一透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)和(he)所(suo)(suo)(suo)述(shu)(shu)(shu)第二(er)(er)透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)之(zhi)間(jian)(jian)的(de)(de)空氣(qi)間(jian)(jian)隔；g45為(wei)所(suo)(suo)(suo)述(shu)(shu)(shu)第四(si)透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)和(he)所(suo)(suo)(suo)述(shu)(shu)(shu)第五(wu)透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)之(zhi)間(jian)(jian)的(de)(de)空氣(qi)間(jian)(jian)隔；g78為(wei)所(suo)(suo)(suo)述(shu)(shu)(shu)第七透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)和(he)所(suo)(suo)(suo)述(shu)(shu)(shu)第八透(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)之(zhi)間(jian)(jian)的(de)(de)空氣(qi)間(jian)(jian)隔；efl為(wei)所(suo)(suo)(suo)述(shu)(shu)(shu)定焦鏡(jing)(jing)(jing)(jing)(jing)頭(tou)的(de)(de)前(qian)焦距。

8、可選地，所(suo)(suo)述(shu)第(di)一(yi)(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)、所(suo)(suo)述(shu)第(di)二透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)、所(suo)(suo)述(shu)第(di)七(qi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和所(suo)(suo)述(shu)第(di)八(ba)(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)滿(man)足以下(xia)關(guan)系式：alt/(t1+g12)≤4.400；alt/(g23+g78)≤90；其中(zhong)(zhong)，t1為(wei)所(suo)(suo)述(shu)第(di)一(yi)(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)的(de)中(zhong)(zhong)心厚度；g12為(wei)所(suo)(suo)述(shu)第(di)一(yi)(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和所(suo)(suo)述(shu)第(di)二透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)之(zhi)(zhi)間(jian)(jian)的(de)空(kong)氣(qi)間(jian)(jian)隔(ge)；g23為(wei)所(suo)(suo)述(shu)第(di)二透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和所(suo)(suo)述(shu)第(di)三透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)之(zhi)(zhi)間(jian)(jian)的(de)空(kong)氣(qi)間(jian)(jian)隔(ge)；g78為(wei)所(suo)(suo)述(shu)第(di)七(qi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)和所(suo)(suo)述(shu)第(di)八(ba)(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)之(zhi)(zhi)間(jian)(jian)的(de)空(kong)氣(qi)間(jian)(jian)隔(ge)；alt為(wei)所(suo)(suo)述(shu)第(di)一(yi)(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)至(zhi)所(suo)(suo)述(shu)第(di)八(ba)(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)中(zhong)(zhong)各透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)的(de)中(zhong)(zhong)心厚度之(zhi)(zhi)和。

9、可選地，所(suo)(suo)述(shu)(shu)(shu)第(di)二(er)透(tou)(tou)(tou)鏡(jing)(jing)至所(suo)(suo)述(shu)(shu)(shu)第(di)四(si)透(tou)(tou)(tou)鏡(jing)(jing)滿足以下關系式：tl/(g23+t3+g34+t4)≥3.0；tl/(g23+g34+t4)≤5.300；其中(zhong)，t3為(wei)所(suo)(suo)述(shu)(shu)(shu)第(di)三透(tou)(tou)(tou)鏡(jing)(jing)的中(zhong)心厚度；t4為(wei)所(suo)(suo)述(shu)(shu)(shu)第(di)四(si)透(tou)(tou)(tou)鏡(jing)(jing)的中(zhong)心厚度；g23為(wei)所(suo)(suo)述(shu)(shu)(shu)第(di)二(er)透(tou)(tou)(tou)鏡(jing)(jing)和(he)所(suo)(suo)述(shu)(shu)(shu)第(di)三透(tou)(tou)(tou)鏡(jing)(jing)之(zhi)(zhi)間的空氣(qi)間隔；g34為(wei)所(suo)(suo)述(shu)(shu)(shu)第(di)三透(tou)(tou)(tou)鏡(jing)(jing)和(he)所(suo)(suo)述(shu)(shu)(shu)第(di)四(si)透(tou)(tou)(tou)鏡(jing)(jing)之(zhi)(zhi)間的空氣(qi)間隔；tl為(wei)所(suo)(suo)述(shu)(shu)(shu)第(di)一(yi)透(tou)(tou)(tou)鏡(jing)(jing)的物側(ce)面(mian)至所(suo)(suo)述(shu)(shu)(shu)第(di)八透(tou)(tou)(tou)鏡(jing)(jing)的像(xiang)側(ce)面(mian)之(zhi)(zhi)間的間距。

10、可選地，所(suo)述(shu)(shu)(shu)第(di)二(er)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)至(zhi)所(suo)述(shu)(shu)(shu)第(di)八(ba)(ba)(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)滿足以下關(guan)系式：alt/(t2+bfl)≥2.0；hfov/(t6+t7+t8)≤10.00；ttl/(g34+g45+g78)≤25.00；aag/(t3+g45)≤3.0；其中(zhong)(zhong)(zhong)，t2為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)二(er)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)(zhong)心(xin)(xin)(xin)厚(hou)度；t3為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)三(san)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)(zhong)心(xin)(xin)(xin)厚(hou)度；t6為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)六(liu)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)(zhong)心(xin)(xin)(xin)厚(hou)度；t7為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)七(qi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)(zhong)心(xin)(xin)(xin)厚(hou)度；t8為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)八(ba)(ba)(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)(zhong)心(xin)(xin)(xin)厚(hou)度；alt為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)一(yi)(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)至(zhi)所(suo)述(shu)(shu)(shu)第(di)八(ba)(ba)(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)中(zhong)(zhong)(zhong)各透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)的(de)(de)中(zhong)(zhong)(zhong)心(xin)(xin)(xin)厚(hou)度之(zhi)和(he)；aag為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)一(yi)(yi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)至(zhi)所(suo)述(shu)(shu)(shu)第(di)八(ba)(ba)(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)中(zhong)(zhong)(zhong)各透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)之(zhi)間(jian)(jian)(jian)的(de)(de)空(kong)(kong)氣(qi)間(jian)(jian)(jian)隔(ge)之(zhi)和(he)；hfov為(wei)(wei)對(dui)角(jiao)線像高(gao)所(suo)對(dui)應的(de)(de)視場角(jiao)的(de)(de)一(yi)(yi)半；ttl為(wei)(wei)所(suo)述(shu)(shu)(shu)定(ding)焦(jiao)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)頭(tou)的(de)(de)總長；bfl為(wei)(wei)所(suo)述(shu)(shu)(shu)定(ding)焦(jiao)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)頭(tou)的(de)(de)后焦(jiao)距；g34為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)三(san)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)和(he)所(suo)述(shu)(shu)(shu)第(di)四(si)(si)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)之(zhi)間(jian)(jian)(jian)的(de)(de)空(kong)(kong)氣(qi)間(jian)(jian)(jian)隔(ge)；g45為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)四(si)(si)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)和(he)所(suo)述(shu)(shu)(shu)第(di)五透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)之(zhi)間(jian)(jian)(jian)的(de)(de)空(kong)(kong)氣(qi)間(jian)(jian)(jian)隔(ge)；g78為(wei)(wei)所(suo)述(shu)(shu)(shu)第(di)七(qi)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)和(he)所(suo)述(shu)(shu)(shu)第(di)八(ba)(ba)(ba)透(tou)(tou)(tou)(tou)鏡(jing)(jing)(jing)(jing)(jing)(jing)(jing)之(zhi)間(jian)(jian)(jian)的(de)(de)空(kong)(kong)氣(qi)間(jian)(jian)(jian)隔(ge)。

11、可(ke)選地，所述(shu)定焦(jiao)(jiao)鏡(jing)(jing)頭的后焦(jiao)(jiao)距bfl、所述(shu)定焦(jiao)(jiao)鏡(jing)(jing)頭的前(qian)焦(jiao)(jiao)距efl、所述(shu)定焦(jiao)(jiao)鏡(jing)(jing)頭的光(guang)圈fno滿足以下關系式：(efl+bfl)/fno≥3.50。

12、可選地，所(suo)述(shu)定(ding)焦鏡(jing)頭(tou)的(de)后焦距bfl、所(suo)述(shu)定(ding)焦鏡(jing)頭(tou)中所(suo)述(shu)第一透(tou)鏡(jing)至所(suo)述(shu)第八透(tou)鏡(jing)中各透(tou)鏡(jing)之間的(de)空氣間隔之和aag滿足(zu)以下關系(xi)式：aag/bfl≥0.8。

13、可選(xuan)地(di)，所(suo)述定焦鏡頭(tou)的(de)后焦距bfl、所(suo)述定焦鏡頭(tou)的(de)半(ban)像高的(de)imgh滿足以下(xia)關系式：imgh/bfl≥1。

14、可選(xuan)地，所述(shu)定焦鏡頭的(de)總長ttl、所述(shu)定焦鏡頭的(de)半視場角hfov滿足以下關系式(shi)：hfov/ttl≤2.2。

15、可選地(di)，所述定焦鏡頭(tou)的(de)總(zong)長ttl≤15.000mm。

16、根(gen)據本發(fa)明實施例提出的(de)定(ding)焦(jiao)(jiao)鏡(jing)(jing)(jing)頭(tou)，包括：沿光(guang)(guang)(guang)軸從物方到像(xiang)方依次排列的(de)光(guang)(guang)(guang)焦(jiao)(jiao)度(du)為負的(de)第(di)(di)一透(tou)(tou)鏡(jing)(jing)(jing)、光(guang)(guang)(guang)焦(jiao)(jiao)度(du)為負的(de)第(di)(di)二(er)透(tou)(tou)鏡(jing)(jing)(jing)、光(guang)(guang)(guang)焦(jiao)(jiao)度(du)為負的(de)第(di)(di)三(san)透(tou)(tou)鏡(jing)(jing)(jing)、光(guang)(guang)(guang)闌、光(guang)(guang)(guang)焦(jiao)(jiao)度(du)為正(zheng)的(de)第(di)(di)四透(tou)(tou)鏡(jing)(jing)(jing)、光(guang)(guang)(guang)焦(jiao)(jiao)度(du)為負的(de)第(di)(di)五(wu)透(tou)(tou)鏡(jing)(jing)(jing)、光(guang)(guang)(guang)焦(jiao)(jiao)度(du)為正(zheng)的(de)第(di)(di)六(liu)透(tou)(tou)鏡(jing)(jing)(jing)、光(guang)(guang)(guang)焦(jiao)(jiao)度(du)為正(zheng)的(de)第(di)(di)七透(tou)(tou)鏡(jing)(jing)(jing)、光(guang)(guang)(guang)焦(jiao)(jiao)度(du)為負的(de)第(di)(di)八透(tou)(tou)鏡(jing)(jing)(jing)；其中，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)五(wu)透(tou)(tou)鏡(jing)(jing)(jing)和(he)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)六(liu)透(tou)(tou)鏡(jing)(jing)(jing)膠合；所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)一透(tou)(tou)鏡(jing)(jing)(jing)、所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)四透(tou)(tou)鏡(jing)(jing)(jing)、所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)五(wu)透(tou)(tou)鏡(jing)(jing)(jing)、所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)六(liu)透(tou)(tou)鏡(jing)(jing)(jing)均為玻璃(li)球面鏡(jing)(jing)(jing)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)二(er)透(tou)(tou)鏡(jing)(jing)(jing)、所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)三(san)透(tou)(tou)鏡(jing)(jing)(jing)、所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)七透(tou)(tou)鏡(jing)(jing)(jing)和(he)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)第(di)(di)八透(tou)(tou)鏡(jing)(jing)(jing)均為塑膠非(fei)球面鏡(jing)(jing)(jing)。采用4g4p組合，能夠很好的(de)校正(zheng)像(xiang)差，減小畸變，同時保證(zheng)足夠好的(de)像(xiang)質，提高分辨(bian)率，光(guang)(guang)(guang)學總長小于(yu)或等于(yu)15mm。

17、應(ying)當理(li)解(jie)，本(ben)部分所描述(shu)的(de)內容并(bing)非旨在標識本(ben)發(fa)明(ming)的(de)實(shi)施例的(de)關鍵或重要(yao)特征，也(ye)不用于限制(zhi)本(ben)發(fa)明(ming)的(de)范圍。本(ben)發(fa)明(ming)的(de)其它特征將(jiang)通過以(yi)下的(de)說明(ming)書而(er)變得容易理(li)解(jie)。