Apparatus to generate a laser beam detect signal

An apparatus to generate a laser beam detect signal, comprising:

• a reflective mirror arranged on a part of an optical path of a laser beam which forms an electrostatic latent image on a photosensitive body;
• a beam detect lens to focus the laser beam reflected from the reflective mirror;
• and
• a printed circuit board having a photo diode sensor to detect the laser beam passed through the beam detect lens, and to generate the laser beam detect signal to synchronize a starting point of an image formation of the electrostatic latent image;
• wherein the beam detect lens and the photo diode sensor are integrally formed with each other so that a center of an optical axis of the beam detect lens is aligned with a detection area of the photo diode sensor.

An apparatus to generate a laser beam detect signal, comprising:

• a reflective mirror arranged on a part of an optical path of a laser beam which forms an electrostatic latent image on a photosensitive body;
• a beam detect lens to focus the laser beam reflected from the reflective mirror;
• a photo diode sensor to detect the laser beam passed through the beam detect lens, and to generate the laser beam detect signal to synchronize a starting point of an image formation of the electrostatic latent image;
• and
• a printed circuit board to fix the photo diode sensor to the printed circuit board;
• wherein the beam detect lens and the photo diode sensor are integrally formed with each other and simultaneously secured on the printed circuit board so that a center of an optical axis of the beam detect lens is aligned with a detection area of the photo diode sensor.

An apparatus to generate a laser beam signal, comprising:

• a semiconductor laser to generate a laser beam which forms an electrostatic latent image on a photosensitive body;
• a reflective mirror arranged on a part of an optical path of the laser beam;
• a beam detect lens to focus the laser beam reflected from the reflective mirror;
• a photo diode sensor to detect the laser beam passed through the beam detect lens, and to generate the laser beam detect signal to synchronize a starting point of an image formation of the electrostatic latent image;
• a first printed circuit board to fix the semiconductor laser to the first printed circuit board;
• a second printed circuit board to fix the photo diode sensor to the second printed circuit board;
• and
• a fixing unit integrally formed with the beam detect lens, to secure the beam detect lens on the second printed circuit board so that a center of an optical axis of the beam detect lens is aligned with a detection area of the photo diode sensor.