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    • 1. 发明授权
    • Light guide and image reading apparatus
    • US10536603B2
    • 2020-01-14
    • US16319527
    • 2018-01-17
    • Mitsubishi Electric Corporation
    • Taku MatsuzawaToru ShirakiHideki KunishioDaisuke Ohama
    • H04N1/04H04N1/028F21V8/00
    • An objective of the present disclosure is to obtain a light guide and an image reading apparatus capable of efficiently irradiating an object to be irradiated (1). The light guide and the image reading apparatus include a rod-shaped light guide main body (2) extending in the longitudinal direction, a first end face (3) that is an end face of the light guide main body (2) along the transverse direction, a light scattering pattern (5) that scatters light that enters from the first end face (3) and is guided inside the light guide main body (2), and a light emission surface portion (6) formed on the light guide main body along a longitudinal direction, the light emission surface portion (6) being a surface from which the light scattered at the light scattering pattern (5) is emitted to outside the light guide main body (2) after being reflected on a wall surface of the light guide main body (2).The light emission surface portion (6) includes a first light emission surface (6a) that is disposed near the first end face (3) in the longitudinal direction and a second light emission surface (6b) that is contiguous with the first light emission surface (6a) in the longitudinal direction. A width of the first light emission surface (6a) in the transverse direction is shorter than a width of the second light emission surface (6b) in the transverse direction.
    • 4. 发明申请
    • LIGHT GUIDE AND IMAGE READING APPARATUS
    • US20190379801A1
    • 2019-12-12
    • US16319527
    • 2018-01-17
    • Mitsubishi Electric Corporation
    • Taku MATSUZAWAToru ShirakiHideki KunishioDaisuke Ohama
    • H04N1/028F21V8/00H04N1/04
    • An objective of the present disclosure is to obtain a light guide and an image reading apparatus capable of efficiently irradiating an object to be irradiated (1). The light guide and the image reading apparatus include a rod-shaped light guide main body (2) extending in the longitudinal direction, a first end face (3) that is an end face of the light guide main body (2) along the transverse direction, a light scattering pattern (5) that scatters light that enters from the first end face (3) and is guided inside the light guide main body (2), and a light emission surface portion (6) formed on the light guide main body along a longitudinal direction, the light emission surface portion (6) being a surface from which the light scattered at the light scattering pattern (5) is emitted to outside the light guide main body (2) after being reflected on a wall surface of the light guide main body (2).The light emission surface portion (6) includes a first light emission surface (6a) that is disposed near the first end face (3) in the longitudinal direction and a second light emission surface (6b) that is contiguous with the first light emission surface (6a) in the longitudinal direction. A width of the first light emission surface (6a) in the transverse direction is shorter than a width of the second light emission surface (6b) in the transverse direction.