E-pin Optical Industry Co., Ltd.

E-pin Optical Industrial Co., Ltd.

I-Lin Chu

Guo-Zen Chen

San-Woei Shyu

Ming-Hua Wen

Jau-Jan Deng

He-Pin Wong

An in-line laser scanning unit (LSU) with multiple light beams is disclosed. The LSU includes a minimized in-line mirror set composed by a plurality of vertically stacked Micro Electronic Mechanical System (MEMS) oscillatory mirrors and a linear corresponding scanning lens set formed by a plurality of F-Sin &#x3b8; lens stacked vertically so as to correct the variation of reflective angle of the oscillatory mirror that is sinusoidal in time. Thus the scanning speed of multiple laser beams on the image plane is constant. Therefore, the volume of color printers is effectively reduced and the scanning efficiency is improved when the LSU in accordance with the present invention is applied to the optical engines of color printers.

In-line laser scanning unit with multiple light beams

A laser device applied to a light source of laser scanning units (LSU) including a laser diode disposed on an accommodation hole of a flange. A collimator lens is arranged on one end of an inner tube part of a holder while the other end of the inner tube part faces the laser diode. The laser beam passes through the inner tube part of the holder and the collimator lens, then projects out. A lug extends radially from outer surface of the holder and a plurality of axial guide slots are disposed on the lug. A plurality of guide pins corresponding to the guide slots are arranged on the flange. An adhesive is located between the guide pins and the guide slots and spaced apart from the collimator lens.

Laser device

A laser scanning unit mainly includes a semiconductor laser, a collimator, a micro electronic mechanic system (MEMS) oscillatory mirror, and an f&#x3b8; lens or an f sin &#x3b8; lens. The MEMS oscillatory mirror is disposed between the collimator and the f&#x3b8; lens to replace a conventional rotary polygonal mirror for controlling a direction in which laser beams are projected from the oscillatory mirror to the f&#x3b8; lens. With the MEMS oscillatory mirror, the cylindrical lens may be omitted from the laser scanning unit and noises produced by the polygonal mirror rotating at high speed may be avoided. Moreover, the MEMS oscillatory mirror allows bi-directional scanning to therefore enable increased scanning frequency, simplified structure, and improved scanning efficiency.

Laser scanning unit

In measuring and assembling a transceiver optical sub-assembly that includes a one-piece or two-piece housing having two opposite apertures separately for an optical fiber and a functional element to assemble thereto, and a lens located between the fiber and the functional element, an image sensor is aligned with the fiber aperture to set a focus on a fiber coupling plane in the housing, and a light spot presented on the fiber coupling plane by a laser beam emitted from the functional element through the lens, or an image of a light-emitting area or a receiving area of the functional element presented on the fiber coupling plane via the lens, is measured to adjust size and/or position thereof, so as to precisely align and fix the functional element to the housing.

Growing community of inventors

Taipei, Taiwan

I-Lin Chu