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US5300956A
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Multibeam semiconductor laser array and multibeam laser printer
Assignee: Fujifilm Business Innovation Corp
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Filing: 1992-02-27
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Granted: 1994-04-05
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Expires: 2012-02-27
Abstract
Abstract A multibeam semiconductor laser array including n pieces of mutually independently drivable semiconductor laser elements which are arranged with a distance r between the elements in such a manner that light leaving centers of respective laser beams emitted from the semiconductor laser elements are aligned on a straight line. In the multibeam semiconductor laser array, the distance r is determined according to the following equation when a light emitting wave length of each of the semiconductor laser elements is expressed as (lambda) and a divergence angle of the laser beam in a direction of the straight line is expressed as (theta)1: (* CHEMICAL STRUCTURE *) where n is an integer equal to or more than 2, (pi) is a circle ratio, I is an interlacing period which is a natural number mutually prime to n, and k is a spot diameter correction coefficient which is a real number in the range of 1.4 <=k<=1.8.
Inventors
- 👤 Takeshi Ohta
- 👤 Masao Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:26
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/435; B41J2/47; B41J2/471; B41J2/473; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1238; G06K15/1257; G06K15/1261; H; H01; H01S; H01S5/00; H01S5/40; H01S5/4025; H01S5/4031; H04; H04N; H04N1/00; H04N1/04; H04N1/19; H04N1/191; H04N1/1911; H04N1/1912; G06K2215/00; G06K2215/111; H01S5/20; H01S5/2054; H01S5/2059; H01S5/4081
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
147 words
A multibeam semiconductor laser array comprising n independently addressable semiconductor lasers which are arranged with a distance r between the lasers, wherein laser beams emitted from centers of respective semiconductor lasers are aligned on a straight line and the distance r is determined according to the following equation when a light emitting wave length of each of the semiconductor lasers is expressed as λ and a divergence panel of the laser beams in a direction of the straight line is expressed as θ 1 : ##EQU7## such that r>(2* a laser width) and where n is an integer equal to or more than 2, π is a circle ratio, Θ 1 >0, I is an interlacing period of the lasers which is a natural number mutually prime to n, and k is a spot diameter correction coefficient which is a real number in a range of 1.4≦k≦1.8.
Claim 2
Dependent Claim
147 words
A multibeam semiconductor laser array comprising n independently addressable semiconductor lasers which are arranged with a distance r between the lasers, wherein laser beams emitted from centers of respective semiconductor lasers are aligned on a straight line and the distance r is determined according to the following equation when a light emitting wave length of each of the semiconductor lasers is expressed as λ and a divergence panel of the laser beams in a direction of the straight line is expressed as θ 1 : ##EQU7## such that r>(2* a laser width) and where n is an integer equal to or more than 2, π is a circle ratio, Θ 1 >0, I is an interlacing period of the lasers which is a natural number mutually prime to n, and k is a spot diameter correction coefficient which is a real number in a range of 1.4≦k≦1.8.
Claim 3
Dependent Claim
21 words
The multibeam semiconductor laser array according to claim 1, wherein n is an odd number and I is equal to 2.
Claim 4
Dependent Claim
15 words
The multibeam semiconductor laser array according to claim 2, wherein n is equal to 3.
Claim 5
Dependent Claim
27 words
The multibeam semiconductor laser array according to claim 1, wherein n is an even number and I is a natural number equal to or more than 3.
Claim 6
Dependent Claim
171 words
A multibeam semiconductor laser array comprising n independently addressable semiconductor lasers which are arranged with a distance r between the lasers, wherein the laser beams emitted from centers of respective semiconductor lasers are aligned on a straight line and the distance r is determined according to the following equation when a light emitting wave length of each of the semiconductor lasers is expressed as λ and a divergence angle of the laser beams in a direction of the straight line is expressed as Θ 1 : ##EQU8## such that r≦2 * a laser width and where n is an integer equal to or more than 2, π is a circle ratio, Θ 1 >0, I is an interlacing period of the lasers which is an integer mutually prime to n and in a range of 2≦I≦5, k is a spot diameter correction coefficient which si a real number in a range of 1.4≦k≦1.8, and A is a spot diameter enlargement coefficient which is a real number in a range of 1.34≦A≦1.97.
Claim 7
Dependent Claim
171 words
A multibeam semiconductor laser array comprising n independently addressable semiconductor lasers which are arranged with a distance r between the lasers, wherein the laser beams emitted from centers of respective semiconductor lasers are aligned on a straight line and the distance r is determined according to the following equation when a light emitting wave length of each of the semiconductor lasers is expressed as λ and a divergence angle of the laser beams in a direction of the straight line is expressed as Θ 1 : ##EQU8## such that r≦2 * a laser width and where n is an integer equal to or more than 2, π is a circle ratio, Θ 1 >0, I is an interlacing period of the lasers which is an integer mutually prime to n and in a range of 2≦I≦5, k is a spot diameter correction coefficient which si a real number in a range of 1.4≦k≦1.8, and A is a spot diameter enlargement coefficient which is a real number in a range of 1.34≦A≦1.97.
Claim 8
Dependent Claim
21 words
The multibeam semiconductor laser array according to claim 5, wherein n is an odd number and I is equal to 2.
Claim 9
Dependent Claim
15 words
The multibeam semiconductor laser array according to claim 6, wherein n is equal to 3.
Claim 10
Dependent Claim
27 words
The multibeam semiconductor laser array according to claim 5, wherein n is an even number and I is a natural number equal to or more than 3.
Claim 11
Dependent Claim
234 words
A multibeam laser printer comprising: a multibeam semiconductor laser array including n mutually independently addressable semiconductor lasers which are arranged with a distance r between the lasers, wherein laser beams emitting from centers of respective lasers are aligned on a straight line and the distance r is determined according o the following equation when a light emitting wave length of each of the semiconductor lasers is expressed as λ and a divergence angle of the laser beams in a direction of the straight line is expressed as Θ 1 : ##EQU9## such that r>2 * a laser width and where n is an in the equal to or more than 2, π is a circle ratio, Θ 1 >0, I is an interlacing period of the lasers which is an integer mutually prime to n and in a range of 2≦I≦5, k is a spot diameter correction coefficient which is a real number in a range of 1.4≦k≦1.8, and A is a spot diameter enlargement coefficient which is a real number in a range of 1.34≦A≦1.97; and an optical stop for limiting a spread of the laser beams emitted from the multibeam semiconductor lasers in the direction of the straight line at a position of a beam diameter corresponding to between 1/e 2 and 1/2 of an intensity of the centers of the laser beams, where e is a base of a natural logarithm.
Claim 12
Dependent Claim
234 words
A multibeam laser printer comprising: a multibeam semiconductor laser array including n mutually independently addressable semiconductor lasers which are arranged with a distance r between the lasers, wherein laser beams emitting from centers of respective lasers are aligned on a straight line and the distance r is determined according o the following equation when a light emitting wave length of each of the semiconductor lasers is expressed as λ and a divergence angle of the laser beams in a direction of the straight line is expressed as Θ 1 : ##EQU9## such that r>2 * a laser width and where n is an in the equal to or more than 2, π is a circle ratio, Θ 1 >0, I is an interlacing period of the lasers which is an integer mutually prime to n and in a range of 2≦I≦5, k is a spot diameter correction coefficient which is a real number in a range of 1.4≦k≦1.8, and A is a spot diameter enlargement coefficient which is a real number in a range of 1.34≦A≦1.97; and an optical stop for limiting a spread of the laser beams emitted from the multibeam semiconductor lasers in the direction of the straight line at a position of a beam diameter corresponding to between 1/e 2 and 1/2 of an intensity of the centers of the laser beams, where e is a base of a natural logarithm.
Claim 13
Dependent Claim
20 words
The multibeam laser printer according to claim 9, wherein n is an odd number and I is equal to 2.
Claim 14
Dependent Claim
14 words
The multibeam laser printer according to claim 10, wherein n is equal to 3.
Claim 15
Dependent Claim
26 words
The multibeam laser printer according to claim 9, wherein n is an even number and I is a natural number equal to or more than 3.
Claim 16
Dependent Claim
23 words
The multibeam laser printer according to claim 9, further comprising a polygonal scanner for scanning the laser beams passed through the optical stop.
Claim 17
Dependent Claim
24 words
The multibeam laser printer according to claim 13, further comprising a lens for focusing the laser beams from the polygonal scanner on a photoreceptor.
References Cited (Backward Citations)
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