LED linear light source and reading apparatus
A linear light source and rod-shaped technology, applied in the field of LED linear light source and reading device, can solve the problem that it is difficult to shorten the total length of the light guide, and achieve the effect of a compact linear light source
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Embodiment 1
[0053] figure 1 The first embodiment of the LED linear light source of the present invention is shown. The light guide body 1 is made of translucent acrylic resin and has a total length of 320 mm. figure 1 (a) shows a side view seen from the light incident portion 10 of the light guide 1 perpendicular to the optical axis direction, figure 1 (b) shows a measurement configuration diagram including the light receiving element 32, figure 1 (c) means figure 1 (b) A-A' sectional view.
[0054] The light guide 1 is composed of an upper surface 3 including an emission surface 2 , a lower surface 7 opposite to the upper surface 3 , and a side surface 8 connecting the upper surface 3 and the lower surface 7 . Reflecting surface 6 constituted by concave portion 4 and convex portion 5 is formed on lower surface 7 .
[0055] The light source 12 is composed of a light emitting diode 13 placed on a substrate; a hemispherical sealing body 14 sealing its outer periphery; and a reflec...
Embodiment 2
[0064] figure 2 It is the second embodiment of the LED linear light source of the present invention. The difference from the first embodiment is that a translucent diffusion sheet 37 is interposed between the lower surface 34 and the side surface 35 of the light guide body 33 and the diffusion reflection member 36 . As the translucent diffusion sheet 37, for example, 25MBC manufactured by Kimoto Co., Ltd. or the like can be used.
[0065] exist figure 2 In (a), the small rectangular member mounted on the glass 31 represents the light receiving element 32 . The light receiving element 32 can move in the Z direction, and the intensity distribution on the glass 31 can be measured.
[0066] figure 2 (b) shows the intensity distribution on the glass 31 . The vertical axis in this figure represents the relative intensity of light. Specifically, it shows that the measurement glass 31 on the original side is equivalent to and figure 1 (b) The intensity value of light at the...
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