Light guide, line illumination apparatus, and image acquisition system

A light guide comprising:

• a transparent member in the shape of a bar;
• a scattering mark configured to scatter a light transmitted inside the transparent member substantially vertical to the longitudinal direction relative to the transparent member;
• a reflection surface, having a curved surface, configured to reflect a light scattered at the scattering mark inside the transparent member;
• a first light exit surface configured to enable a light reflected at the reflection surface to exit outside the transparent member therethrough;
• and
• a second light exit surface configured to enable a light scattered at the scattering mark to exit outside of the transparent member therethrough.

A line illumination apparatus comprising:

• a light guide including a transparent member in the shape of a bar;
• and
• a light source provided at the end of the light guide in the longitudinal direction relative to the light guide;
• wherein the light guide comprises
• a scattering mark configured to scatter a light transmitted inside the transparent member from the light source substantially vertical to the longitudinal direction relative to the transparent member;
• a reflection surface, having a curved surface, configured to reflect a light scattered at the scattering mark inside the transparent member;
• and
• a light exit surface configured to enable a light reflected at the reflection surface to exit outside the transparent member therethrough.

A line illumination apparatus comprising:

• a light guide including a transparent member in the shape of a bar;
• and
• a light source provided at the end of the light guide in the longitudinal direction relative to the light guide;
• wherein the light guide comprises
• a scattering mark configured to scatter a light transmitted inside the transparent member from the light source substantially vertical to the longitudinal direction relative to the transparent member;
• a reflection surface, having a curved surface, configured to reflect a light scattered at the scattering mark inside the transparent member;
• a first light exit surface configured to enable a light reflected at the reflection surface to exit outside the transparent member therethrough;
• and
• a second light exit surface configured to enable a light scattered at the scattering mark to exit outside of the transparent member therethrough.

An image acquisition system comprising:

• a light guide including a transparent member in the shape of a bar;
• a light source provided at the end of the light guide in the longitudinal direction relative to the light guide;
• an image forming optical device configured to form an image of a light from an illumination area illuminated by a light exiting from the light guide;
• and
• an image sensor configured to read a light of the image formed by the image forming optical device,
• wherein the light guide comprises
• a scattering mark configured to scatter a light transmitted inside the transparent member from the light source substantially vertical to the longitudinal direction relative to the transparent member;
• a reflection surface, having a curved surface, configured to reflect a light scattered at the scattering mark inside the transparent member;
• and
• a light exit surface configured to enable a light reflected at the reflection surface to exit outside the transparent member therethrough.

An image acquisition system comprising:

• a light guide including a transparent member in the shape of a bar;
• a light source provided at the end of the light guide in the longitudinal direction relative to the light guide;
• an image forming optical device configured to forming an image of a light from an illumination area illuminated by a light exiting from the light guide;
• and
• an image sensor configured to read a light of the image formed by the image forming optical device,
• wherein the light guide comprises
• a scattering mark configured to scatter a light transmitted inside the transparent member from the light source substantially vertical to the longitudinal direction relative to the transparent member;
• a reflection surface, having a curved surface, configured to reflect a light scattered at the scattering mark inside the transparent member;
• a first light exit surface configured to enable a light reflected at the reflection surface to exit outside the transparent member therethrough;
• and
• a second light exit surface configured to enable a light scattered at the scattering mark to exit outside of the transparent member therethrough.

A line illumination apparatus comprising:

• a light guide including of a transparent member in the shape of a bar;
• and
• a light source provided at a first end of the light guide in the longitudinal direction relative to the light guide;
• wherein the light guide comprises
• a scattering mark configured to scatter a light emitted by the light source;
• a light exit surface configured to enable a light scattered at the scattering mark to exit outside the transparent member therethrough;
• and
• a reflection portion, provided near the first end, configured to interrupt a light, which is emitted by the light source, to be transmitted to a second end facing to the first end and for reflecting the interrupted light so as to enable the interrupted light to exit from the light exit surface located near the light source.

An image acquisition system comprising:

• a light guide including a transparent member in the shape of a bar;
• a light source provided at the end of the light guide in the longitudinal direction relative to the light guide;
• an image forming optical device configured to form an image of a light from an illumination area illuminated by a light exiting from the light guide;
• and
• an image sensor configured to read a light of the image formed by the image forming optical device,
• wherein the light guide comprises
• a scattering mark configured to scatter a light emitted by the light source;
• a light exit surface configured to enable a light scattered at the scattering mark to exit outside the light guide therethrough;
• and
• a reflection portion, provided near the first end, configured to interrupt a light, which is emitted by the light source, to be transmitted to a second end facing to the first end and for reflecting the interrupted light so as to enable the interrupted light to exit from the light exit surface located near the light source.

A line illumination apparatus comprising:

• a light guide including of a transparent member in the shape of a bar;
• and
• a plurality of light sources provided along the longitudinal direction relative to the transparent member;
• wherein the light guide comprises
• a reflection surface, having a curved surface, configured to reflect a light emitted by the light source inside the transparent member;
• and
• a light exit surface configured to enable a light reflected at the reflection surface to exit outside the transparent member therethrough.

An image acquisition system comprising:

• a light guide including of a transparent member in the shape of a bar;
• a plurality of light sources provided along the longitudinal direction relative to the light guide;
• an image forming optical device configured to form an image of a light from an illumination area illuminated by a light exiting from the light guide;
• and
• an image sensor configured to read a light of the image formed by the image forming optical device,
• wherein the light guide comprises
• a reflection surface, having a curved surface, configured to reflect a light emitted by the light source inside the transparent member;
• and
• a light exit surface configured to enable a light reflected at the reflection surface to exit outside the transparent member therethrough.