結像光学系および画像投射装置

Title:

結像光学系および画像投射装置

Document Type and Number:

Japanese Patent JP7154769

Kind Code:

B2

Abstract:

An imaging optical system includes, in order from an enlargement conjugate side to a reduction conjugate side, a first lens unit having a positive refractive power, a second lens unit having a positive refractive power, and a third lens unit. A distance between adjacent lens units varies in focusing from a far side to a near side. An intermediate image is formed inside the second lens unit. In focusing from the far side to the near side, the second lens unit moves to the reduction conjugate side, and the third lens unit moves to the enlargement conjugate side.

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Inventors:

Junya Ichimura

Application Number:

JP2018012817A

Publication Date:

October 18, 2022

Filing Date:

January 29, 2018

Export Citation:

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Assignee:

Canon Inc

International Classes:

G02B13/04; G02B13/18; G03B21/14

Domestic Patent References:

JP2015152764A
JP2017032927A
JP2015179270A
JP2014029392A
JP2018101103A

Attorney, Agent or Firm:

Ryosuke Fujimoto
Atsuya Mizumoto
Tomoya Hirayama

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