Illumination unit, image reading apparatus and forming apparatus using the illumination unit
A lighting unit and a technology of irradiating light, which are applied in lighting and heating equipment, equipment for electric recording technology using charge patterns, image communication, etc., can solve the problems of focus deviation, non-imaging, high power, etc., and achieve low power consumption , good image output, low power consumption effect
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no. 1 example
[0088] As described above, since white spots occur in conventional lighting units, the lighting unit of the present invention is characterized in that, in a virtual plane including the light source and the part to be illuminated, in the direction perpendicular to the part to be illuminated, Outside the vertical area, configure the light source.
[0089] here, Figure 5 It is a schematic diagram which shows the structure of the 1st Example of the lighting unit of this invention.
[0090] The lighting unit of this embodiment has a structure in which a plurality of LEDs 3A as light sources that irradiate light from a small area to the illuminated portion are arranged, and the light irradiated from the LEDs 3A is reflected by the mirror 7 to illuminate the irradiated portion.
[0091] In addition, the lighting unit in the first embodiment, the second embodiment and the third embodiment described later is configured to include the LED 3A and the mirror 7, however, in order to expl...
no. 2 example
[0105] Figure 12 is a schematic diagram showing the structure of the second embodiment of the lighting unit of the present invention, Figure 13 is a schematic diagram showing the structure of a modification of the second embodiment of the lighting unit of the present invention.
[0106] In the present embodiment, the arrangement of the LED 3A and the mirror 7 in the first embodiment is changed to irradiate light to the part to be illuminated. With the mirror 7, light can be collected on the part to be illuminated, so efficient lighting can be performed.
[0107] However, since if Figure 11 With mirror 7 configured as shown, white spots occur, therefore, if Figure 12 and Figure 13 As shown, it is necessary to make the virtual image of the light source caused by reflection outside the vertical line area.
[0108] Furthermore, a photoconductor may be provided instead of the mirror 7 . Here, the light guide is an optical element that guides light entering from one end to...
no. 3 example
[0110] The structure of the third embodiment is the same as that of the first embodiment except for the LED.
[0111]This embodiment can read color information required to obtain full-color image information by using white LEDs. Furthermore, when color information is read, color bleeding occurs, and deterioration due to white spots is conspicuous, but by using the lighting unit of the present invention, white spots can be reduced in the case of light of any wavelength.
[0112] Furthermore, by adopting light sources of multiple colors instead of white LEDs, and by adopting light sources of colors corresponding to the respective filters of red (R), green (G), and blue (B) of the photoelectric conversion element, light utilization efficiency is improved. , and can read full-color image information. Usually, since the LED 3A has a narrow wavelength band, it is not limited to three colors as a light source unit, and the reproducibility of the color information of document informa...
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