Minolta Company, Ltd.

Tomoo Doi

Tetsuo Kohno

Kazuhiko Ishimaru

Hiromu Mukai

Hiroyuki Matsumoto

Masashi Isono

A lens holding structure in a lens block forming all or part of an optical system, the lens holding structure capable of attaining a compact lens block of inexpensive and simple construction by using a holding barrel having an outer diameter smaller than an outer diameter of the largest lens element to be included in the lens block. The largest lens element is fixed to another lens element to be included in the lens block or the holding barrel by a face thereof having a predetermined angle with respect to an optical axis of the lens block.

Lens holding structure in a lens block forming all or part of an optical system and method of assembling the lens block

A zoom lens system has a first lens unit and a second lens unit from the object side. The first lens unit has a negative optical power. The second lens unit has a positive optical power. The second lens unit is arranged on the image side of the first lens unit. An air space between the first and second units is variable for zooming. The second lens unit has a doublet lens element composed of a positive lens element and a negative lens element cemented together.

Growing community of inventors

Wakayama-Ken, Japan

Tomoo Doi