Light detecting device
AssigneeDenso Corporation
InventorsKazuhisa Onda, Sakito Miki
Life of this patent
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Abstract
A light detecting device includes a reception optical system that guides a reflected beam along a reception optical axis and a light receiver that outputs a detection signal by receiving the reflected beam. The light receiver forms a reception surface having a reception aspect ratio in which a long side extends along a first reference axis orthogonal to the reception optical axis. The reception surface is inclined around the first reference axis with respect to a second reference axis orthogonal to the reception optical axis and the first reference axis.
Claims9
A light detecting device configured to scan a projection beam toward a detection area and detect a reflected beam from the detection area, the light detecting device comprising:
- a reception optical system configured to guide the reflected beam along a reception optical axis;
- a light receiver configured to output a detection signal by receiving the reflected beam through the reception optical system;
- and
- a reception prism configured to refract the reflected beam in front of the light receiver, wherein
- the light receiver forms a reception surface having a reception aspect ratio in which a long side extends along a first reference axis orthogonal to the reception optical axis,
- the reception surface is disposed in a posture inclined around the first reference axis with respect to a second reference axis orthogonal to the reception optical axis and the first reference axis,
- the reception prism has an optical surface disposed in a posture inclined around the first reference axis with respect to the second reference axis, and the optical surface is formed by an incident surface or/and an emission surface of the reception prism,
- the reception optical system includes a reception lens configured to focus the reflected beam on the light receiver,
- the reception optical system includes a lens barrel housing the reception lens, and
- the lens barrel forms a light absorbing surface around an exit port of the lens barrel adjacent to the light receiver so as to absorb a retroreflection component of the reflected beam.
A light detecting device configured to scan a projection beam toward a detection area and detect a reflected beam from the detection area, the light detecting device comprising:
- a reception optical system configured to guide the reflected beam along a reception optical axis;
- a light receiver configured to output a detection signal by receiving the reflected beam through the reception optical system;
- and
- a reception prism configured to refract the reflected beam in front of the light receiver, wherein
- the light receiver forms a reception surface having a reception aspect ratio in which a long side extends along a first reference axis orthogonal to the reception optical axis,
- the reception prism has an optical surface disposed in a posture inclined around the first reference axis with respect to a second reference axis orthogonal to the reception optical axis and the first reference axis, and the optical surface is formed by an incident surface or/and an emission surface of the reception prism,
- the reception optical system includes a reception lens configured to focus the reflected beam on the light receiver,
- the reception optical system includes a lens barrel housing the reception lens, and
- the lens barrel forms a light absorbing surface around an exit port of the lens barrel adjacent to the light receiver so as to absorb a retroreflection component of the reflected beam.
A light detecting device configured to scan a projection beam toward a detection area and detect a reflected beam from the detection area, the light detecting device comprising:
- a reception optical system configured to guide the reflected beam along a reception optical axis;
- a light receiver configured to output a detection signal by receiving the reflected beam through the reception optical system;
- and
- a reception prism configured to refract the reflected beam in front of the light receiver, wherein
- the light receiver forms a reception surface having a reception aspect ratio in which a long side extends along a first reference axis orthogonal to the reception optical axis,
- the reception surface is disposed in a posture inclined around the first reference axis with respect to a second reference axis orthogonal to the reception optical axis and the first reference axis,
- the reception prism has an optical surface disposed in a posture inclined around the first reference axis with respect to the second reference axis, and the optical surface is formed by an incident surface or/and an emission surface of the reception prism,
- the reception optical system includes a reception lens configured to focus the reflected beam on the light receiver,
- the reception optical system includes a lens barrel housing the reception lens, and
- the lens barrel forms an aperture stop to narrow an exit port adjacent to the light receiver.
A light detecting device configured to scan a projection beam toward a detection area and detect a reflected beam from the detection area, the light detecting device comprising:
- a reception optical system configured to guide the reflected beam along a reception optical axis;
- a light receiver configured to output a detection signal by receiving the reflected beam through the reception optical system;
- and
- a reception prism configured to refract the reflected beam in front of the light receiver, wherein
- the light receiver forms a reception surface having a reception aspect ratio in which a long side extends along a first reference axis orthogonal to the reception optical axis,
- the reception prism has an optical surface disposed in a posture inclined around the first reference axis with respect to a second reference axis orthogonal to the reception optical axis and the first reference axis, and the optical surface is formed by an incident surface or/and an emission surface of the reception prism,
- the reception optical system includes a reception lens configured to focus the reflected beam on the light receiver,
- the reception optical system includes a lens barrel housing the reception lens, and
- the lens barrel forms an aperture stop to narrow an exit port adjacent to the light receiver.
Dependencies are inferred from the claim text.