投とう射しゃ

と

う

しゃ

Common wordJLPTN1Freq.FrequencyTop 50,000

投射する · noun or participle which takes 'suru'

Meanings

Technical term for projecting an image, light, or shadow onto a surface. Often used in optics, photography, and display technology.

〈物もの〉を〈場ば所しょ〉に投とう射しゃするto project something onto a surface
プロジェクターで画が像ぞうをスクリーンに投とう射しゃした。
We projected the image onto the screen with a projector.
光ひかりを投とう射しゃするto project light (onto something)
レンズを通とおして光ひかりを壁かべに投とう射しゃする実じっ験けんを行おこなった。
We carried out an experiment projecting light onto the wall through a lens.

投とう影えいN1
投影 is the everyday word for projecting an image or shadow (and also psychological projection), while 投射 is the more technical term used mainly in optics and physics.
映えい写しゃN1
映写 refers specifically to projecting a film or slide onto a screen, whereas 投射 is a broader technical term for projecting light or images in general.

謄とう写しゃ
謄写 (とうしゃ) is a same-sounding word meaning to copy or duplicate a document (as with a mimeograph), completely unrelated to 投射's meaning of projecting light or an image.

From 投 (throw, cast) + 射 (shoot, emit). The combination conveys casting light or an image onto a surface.