Mr. Nobuyoshi Mori Profile

Nobuyoshi Mori

at Konica Minolta Inc

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Proceedings Article | 19 August 2005 Paper

Recent technology and usage of plastic lenses in image taking objectives

Susumu Yamaguchi, Hiroshi Sato, Nobuyoshi Mori, Toshihiko Kiriki

Proceedings Volume 5872, 58720E (2005) https://doi.org/10.1117/12.614056

KEYWORDS: Objectives, Cameras, Plastic lenses, Zoom lenses, Modulation transfer functions, Lenses, Digital cameras, CMOS sensors, Image sensors, Cell phones

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Recently, plastic lenses produced by injection molding are widely used in image taking objectives for digital cameras, camcorders, and mobile phone cameras, because of their suitability for volume production and ease of obtaining an advantage of aspherical surfaces. For digital camera and camcorder objectives, it is desirable that there is no image point variation with the temperature change in spite of employing several plastic lenses. At the same time, due to the shrinking pixel size of solid-state image sensor, there is now a requirement to assemble lenses with high accuracy. In order to satisfy these requirements, we have developed 16 times compact zoom objective for camcorder and 3 times class folded zoom objectives for digital camera, incorporating cemented plastic doublet consisting of a positive lens and a negative lens. Over the last few years, production volumes of camera-equipped mobile phones have increased substantially. Therefore, for mobile phone cameras, the consideration of productivity is more important than ever. For this application, we have developed a 1.3-mega pixels compact camera module with macro function utilizing the advantage of a plastic lens that can be given mechanically functional shape to outer flange part. Its objective consists of three plastic lenses and all critical dimensions related to optical performance can be determined by high precise optical elements. Therefore this camera module is manufactured without optical adjustment in automatic assembling line, and achieves both high productivity and high performance. Reported here are the constructions and the technical topics of image taking objectives described above.

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