JPH0337439U

JPH0337439U -

Info

Publication number: JPH0337439U
Application number: JP9742489U
Authority: JP
Priority date: 1989-08-23
Filing date: 1989-08-23
Publication date: 1991-04-11

Description

[Brief explanation of drawings]

第１図は、この考案に係る原稿照明装置の全体
構成を示す斜視図、第２図ａは、第１図に示す実
施例の屈折率分布型レンズの平面図、第２図ｂは
、第２図ａの正面図、第２図ｃは、上記屈折率分
布型レンズの屈折率を示す特性図、第３図は、従
来の原稿照明装置の全体構成を示す斜視図、第４
図ａは、第３図の原稿照明装置に用いられるフレ
ネルレンズの平面図、第４図ｂは、第４図ａの断
面図、第４図ｃは、第４図ａの正面図である。１１……光源、１２……原稿載置ガラス、１３
……屈折率分布型レンズ、１４……折り返しミラ
ー、１５……読取用レンズ、１６……イメージセ
ンサ。 FIG. 1 is a perspective view showing the overall configuration of the document illumination device according to the invention, FIG. 2a is a plan view of the gradient index lens according to the embodiment shown in FIG. FIG. 2a is a front view, FIG. 2c is a characteristic diagram showing the refractive index of the gradient index lens, FIG. 3 is a perspective view showing the overall configuration of a conventional document illumination device, and FIG.
FIG. 4a is a plan view of the Fresnel lens used in the document illumination device of FIG. 3, FIG. 4b is a sectional view of FIG. 4a, and FIG. 4c is a front view of FIG. 4a. 11...Light source, 12...Document placement glass, 13
...Gradient index lens, 14... Returning mirror, 15... Reading lens, 16... Image sensor.

Claims

[Scope of utility model registration request]

A document placing glass on which a document is placed, a light source that irradiates light in a band shape onto the illuminated portion of the document, and a light source disposed between the light source and the illuminated portion of the document that emits light emitted from the light source. A gradient index lens that converges in the sub-scanning direction with respect to the document; a folding mirror that changes the optical path of the reflected light from the illuminated portion of the document; and a folding mirror that changes the optical path of the reflected light from the illuminated portion of the document, and transmits the reflected light that has been changed in the optical path by the folding mirror to an image sensor. A document illumination device characterized by comprising a reading lens that forms an image.