Illumination unit, image read apparatus and image forming apparatus
An image reading device and a technology for an illuminating unit, which are applied in the equipment, image communication, and electric recording process applying a charge pattern, etc. The effects of specular reflection, undisclosed specular reflection effects, etc.
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no. 1 example
[0054] The reflected light from the illuminated part of the original document 2 is reflected by the first reflective mirror 3C provided in the first scanning body 3, and then sequentially reflected by the second reflective mirror 4A and the third reflective mirror 4B in the second scanning body 4, A reduced image of the original document image is thus formed on the imaging plane of the light receiving element 6 through the focusing lens 5 . The first reflection mirror 3 , the second reflection mirror 4A, and the third reflection mirror 4B constitute an optical reflection system.
[0055] The first scanning body 3 and the second scanning body 4 are respectively driven in the direction of the arrow (to the right in the figure) by a driving unit not shown. Let the moving speed of the first scanning body 3 be V, and the moving speed of the second scanning body 4 be V / 2. The first scanning body 3 and the second scanning body 4 are displaced to figure 1 The position shown by the ...
no. 2 example
[0095] Figure 11 is a schematic side view of the image reading apparatus 101 of this embodiment. In the image reading apparatus 101, an original document 2 having an image to be read is placed flat on a contact glass 1 as a document platen. On the underside of the contact glass 1 is provided a later-described lighting unit 20 for thereby obliquely illuminating the bottom surface of the original document 2 . In the lighting unit 20, a plurality of light source units 21 ( FIG. 13 ) are arranged on the normal direction of the drawing, wherein point light sources such as LEDs with a small area emit light in a slit-like manner in the normal direction. Illumination of the original document 2 is performed.
[0096] The reflected light from the illuminated part of the original document 2 is reflected by the first reflective mirror 3C provided in the first scanning body 3, and then sequentially reflected by the second reflective mirror 4A and the third reflective mirror 4B in the se...
no. 3 example
[0129] Figure 20A A lighting unit 30 including a plurality of light source units 31 arranged in a row on a single substrate 34 is shown. As shown, the light source units 31 are reflection type light source units, each of which emits light from a light source body 31 a and reflects light from a reflective portion 32 , thereby illuminating the surface of the document with light. In this embodiment, the light source body 31a uses LEDs. In the lighting unit 30, the reflective portion 32 has a surface in the shape of a parabola, and the light source body 31a is placed at the focal point of the reflective portion 32, thereby allowing the light emitted from the focal point of the paraboloid to flow in a substantially parallel direction toward the document, i.e. Emit in a direction substantially perpendicular to the surface of the document. Therefore, even Lambert diffused light emitted in a substantially vertical direction by the light source unit 31a of a small size can illuminat...
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