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新型数字相机正以不断提高分辨率、缩小尺寸和降低价格的稳定发展潮流冲击着胶片相机在摄影消费品市场中的统治地位.在专利文献中,数字式照相物镜的数量在不断地增加足以反映这种发展趋势.这些设计的共同特点是:很小的图像尺寸、远心或近似远心出(?),以及整个系统长度对图像画幅对角线长度之比值远比胶片相机的要大得多.最新设计的物镜示于图1,其数据列于表1.这是一个2.8:1变焦距物镜,设计用在1/4 in(对角线长度4.5mm)的传感器上.该系统是一个两组负一正型结构,负型前组透镜是由两组负透镜后续接一块正透镜构成的.该设计与具有相近性能的最新一些其他设计相类似,但是有一个明显不同的特点,它是用一块凹的非球形二次曲面来控制畸变,
New digital cameras are battling the growth of film cameras in the consumer photographic market with steadily increasing trends in resolution, size reduction and price reduction. In the patent literature, the number of digital photographic objectives is constantly increasing enough to reflect this A common characteristic of these designs is the small image size, telecentric or near telecentric (?), And the ratio of the length of the entire system to the diagonal of the image frame far greater than the film camera The newly designed objective lens is shown in Figure 1 and its data is given in Table 1. This is a 2.8: 1 variable objective lens designed for use on a 1/4 in. Sensor with a diagonal length of 4.5 mm. The system is a The negative and positive front lenses are composed of two negative lenses followed by a positive lens.The design is similar to some of the newest other designs with similar properties but with a distinctly different feature, Is to use a concave non-spherical quadric surface to control distortion,