Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PROJECTION OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JP2016151687
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a projection optical system that covers a wide variable range and is designed also for a high-definition image display element, in application to a proximity type projector.SOLUTION: A 1-2 lens group 42 comprises an aspherical resin lens L14 and L16 to enable correction effective to suppress a fluctuation in aberration, where a spherical glass lens L15 is arranged between the lens L14 and L16 to control the angle of a light beam entering the resin lens L16, and the power of the resin lens L14 and L16 is reduced to prevent a variation in shape of the resin lens L16. Thus, even when a second optical group 40b is constituted of one mirror MR, appropriate aberration is included in a primary image so as to provide a good image with less aberration, the image to be ultimately projected on a screen through the second optical group 40b.SELECTED DRAWING: Figure 3

Inventors:
MINEFUJI NOBUTAKA
Application Number:
JP2015029306A
Publication Date:
August 22, 2016
Filing Date:
February 18, 2015
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SEIKO EPSON CORP
International Classes:
G02B17/08; G02B19/00
Attorney, Agent or Firm:
Mikio Suzuno
Kazuaki Watanabe
Keisuke Nishida
Satoshi Nakai



 
Previous Patent: PROJECTION OPTICAL SYSTEM

Next Patent: PROJECTION OPTICAL SYSTEM