Scanning optical apparatus
First Claim
Patent Images
1. A scanning optical apparatus comprising:
- a semiconductor laser;
a deflecting element for deflecting a light beam emitted from said semiconductor laser; and
a scanning optical system for directing the light beam deflected by said deflecting element onto a surface to be scanned, said scanning optical system including a refracting portion and a diffracting portion,wherein the following condition is satisfied;
space="preserve" listing-type="equation">1.0≦
φ
L/φ
D≦
2.6where φ
L represents the power of the refracting portion of said scanning optical system and φ
D represents the power of the diffracting portion of said scanning optical system.
1 Assignment
0 Petitions
Accused Products
Abstract
A scanning optical apparatus includes a semiconductor laser as a light source, a deflector for deflecting a light beam emitted from the semiconductor laser, and optical element for directing the light beam emitted from the semiconductor laser to a surface to be scanned. The optical element includes a refracting porion and a diffracting portion, wherein changes in the focus in the main scanning direction, resulting from the environmental fluctuations, of the scanning optical apparatus are corrected by a characteristic of the optical element.
-
Citations
39 Claims
-
1. A scanning optical apparatus comprising:
-
a semiconductor laser; a deflecting element for deflecting a light beam emitted from said semiconductor laser; and a scanning optical system for directing the light beam deflected by said deflecting element onto a surface to be scanned, said scanning optical system including a refracting portion and a diffracting portion, wherein the following condition is satisfied;
space="preserve" listing-type="equation">1.0≦
φ
L/φ
D≦
2.6where φ
L represents the power of the refracting portion of said scanning optical system and φ
D represents the power of the diffracting portion of said scanning optical system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 38, 39)
-
-
12. A scanning optical apparatus comprising:
-
a semiconductor laser; a deflecting element for deflecting a light beam emitted from said semiconductor laser; and a scanning optical system for directing the light beam deflected by said deflecting element onto a surface to be scanned, said scanning optical system including a refracting portion and a diffracting portion, wherein said scanning optical system comprises a single lens, and a diffracting optical element is provided on at least one of a light incident surface and a light emergent surface of said single lens, and a change in the focus in a main scanning direction, resulting from environmental fluctuations, of said scanning optical apparatus is corrected by a characteristic of said scanning optical system. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A scanning optical apparatus comprising:
-
a semiconductor laser; a deflecting element for deflecting a light beam emitted from said semiconductor laser; and an anamorphic optical system for causing the light beam emitted from said semiconductor laser to be imaged in a linear shape elongated in a main scanning direction on a deflecting surface of said deflecting element, said anamorphic optical system having a diffracting portion; and a scanning optical system for directing the light beam deflected by said deflecting element onto a surface to be scanned, wherein said scanning optical system comprises a single lens which is composed of a plastic material, and a change in focus in the main scanning direction, resulting from environmental fluctuation, of said scanning optical apparatus is corrected by characteristics of said anamorphic optical system and said scanning optical system. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
-
-
29. A scanning optical apparatus comprising:
-
a semiconductor laser; a collimator lens for converting a light beam emitted from said semiconductor laser into a parallel beam, said collimator lens having a diffracting portion; a deflecting optical element for deflecting the light beam transmitted through said collimator lens; and a scanning optical system for directing the light beam deflected by said deflecting element onto a surface to be scanned, said scanning optical system having a refracting portion, wherein a change in focus in a main scanning direction, resulting from environmental fluctuation, of said scanning optical apparatus is corrected by characteristics of said collimator lens and said scanning optical system. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
-
Specification