Title:
Image projection device
Document Type and Number:
Japanese Patent JP5975012
Kind Code:
B2
Abstract:
An image projection apparatus which enlarges and projects an image displayed on an image display element as a projection image on a screen, comprising the image display element displaying an image, a refracting optical system including a free-curved lens; a reflecting optical system including at least one concave mirror, and a light-blocking member including an aperture. On a sectional surface of a total light flux being introduced into the refracting optical system and is imaged on the screen after the concave mirror, when a direction A corresponds to a long side and a direction B corresponds to a short side of the projection image, the light-blocking member includes the aperture between a position in which a diameter of the total light flux in the direction A is the smallest and a position, those in the direction B is the smallest.
Inventors:
Hibiki Tatsuno
Application Number:
JP2013239255A
Publication Date:
August 23, 2016
Filing Date:
November 19, 2013
Export Citation:
Assignee:
株式会社リコー
International Classes:
G03B21/14; G02B13/18; G02B13/24; G02B17/08; G03B21/00
Domestic Patent References:
| JP2011033738A | ||||
| JP2008165202A | ||||
| JP2011033737A | ||||
| JP2008522229A | ||||
| JP2008107801A | ||||
| JP2004258620A | ||||
| JP2011150029A | ||||
| JP2011150030A |
Attorney, Agent or Firm:
Shuichi Kudo
Toru Kabayama
Shogo Honda
Toru Kabayama
Shogo Honda
Previous Patent: A manufacturing method of a multilayer printed wiring board
Next Patent: HOUSE INSTALLATION APPARATUS
Next Patent: HOUSE INSTALLATION APPARATUS