Semiconductor laser and optical system having a collimator lens
AssigneeRohm Co., Ltd.
InventorsNaotaro Nakata, Akihisa Yoshida
Life of this patent
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Abstract
An optical system includes a semiconductor laser. The semiconductor laser is accommodated within a case. The case is formed with a window to pass through laser light emitted from the semiconductor laser. The laser light passed through the window comes to a collimator lens. Between semiconductor laser and the collimator lens is provided a light shield member having a pinhole to pass through the laser light having passed the window. Laser light made in a parallel luminous flux is outputted from the collimator lens. This laser light is deflected toward a main scanning direction by a deflector and further collected on a scanning surface by a light collector.
Claims3
An optical system, comprising:
- a semiconductor laser;
- a case accommodating said semiconductor laser and having a window to pass through laser light emitted from said semiconductor laser;
- a collimator lens for turning said laser light passed through said window into a parallel luminous flux;
- a deflector for reflecting said laser light in a parallel luminous flux toward a main scanning direction;
- a light collector for collecting the laser light onto a scanning surface;
- and
- a light shield member provided between said semiconductor laser and said collimator lens and having a pinhole to allow said laser light passed through said window to pass through, wherein said laser light reflected upon an inner surface of said pinhole and then directly delivered to said collimator lens is all given to said deflector.
Dependencies are inferred from the claim text.