Title:
PHOTOGRAPHIC LENS SYSTEM
Document Type and Number:
Japanese Patent JPH01107227
Kind Code:
A
Abstract:
PURPOSE:To simplify a constitution by forming one photographic lens system by integrating 1st or 2nd photographic lens part system which constitutes a part of the photographic lens with a common part system. CONSTITUTION:The common part system X of a lens barrel is provided with a focusing lens F having a negative refractive power as a hole, a driving device for moving the focusing lens F, for example, an oscillatory wave motor, and a diaphragm S. And the 1st and 2nd photographic lens part systems A and B are designed so that they become in an excellent aberration state by being integrated with the common part system X because the sufficient correction of the aberration is not executed to the respective and individual systems, and they have a positive refractive power as a whole. Since the excellent correction of the aberration can be obtained by integrating the common lens barrel equipped with the focusing lens F and a front group which can be loaded and unloaded, the common barrel, of course, is used in common. It will do that the front group has a comparatively simple lens constitution, so that the device can be produced at low cost.
Inventors:
TANAKA TSUNEFUMI
Application Number:
JP26570287A
Publication Date:
April 25, 1989
Filing Date:
October 20, 1987
Export Citation:
Assignee:
CANON KK
International Classes:
G02B15/02; G03B17/14; (IPC1-7): G02B15/02
Attorney, Agent or Firm:
Marushima Giichi