JP3670858B2 - Multi-beam light source device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to an optical writing scanning device of an image forming apparatus such as a digital copying machine or a laser printer, and in particular, a multi-beam used for simultaneously scanning a surface to be scanned such as a photosensitive member by a plurality of laser beams. The present invention relates to a light source device.
[0002]
[Prior art]
In general, as a technique for improving the recording speed in an optical scanning device used in an optical writing system, there is a method of increasing the rotational speed of a polygon mirror as a deflecting means. However, this method has problems such as durability of the polygon motor, noise, vibration, laser modulation speed, and the like, and there is a limit to improving the recording speed.
[0003]
Therefore, a multi-beam scanning device has been proposed in which a plurality of laser beams are scanned at a time to record a plurality of recording lines simultaneously. For example, as disclosed in Japanese Patent Laid-Open No. 56-42248, a semiconductor laser array in which a plurality of light emitting sources (light emitting points) are arranged in a monolithic array is used as a light source.
[0004]
Usually, the optical output of the semiconductor laser is detected by using the scanning time outside the image area for each scanning line, and the applied current amount is set by feedback control. In the semiconductor laser array as described in the above publication example, although there are a plurality of light sources (light emitting points), since the sensor for detecting the light output is common, the output setting from the light output to the feedback is not performed in time series. I do not get. Therefore, as the number of light sources in the semiconductor laser array increases, the time required for this processing increases, and there is a high possibility that the scanning time outside the image area for each scan will not be in time. If it is not in time, the above processing is performed using the scanning time between pages. However, in this case, the set applied current amount must be maintained for a long time, and the laser output fluctuates during that time. The image density may change.
[0005]
In this regard, according to Japanese Patent Laid-Open No. 7-72407, laser beams emitted from a plurality of light emitting sources of a plurality of semiconductor laser arrays are combined using beam combining means such as a prism, and a plurality of light sources are also generated from one light source. A multi-beam light source unit configured to emit a laser beam of a book has been proposed. According to this, since the number of light emitting points required for one semiconductor laser array can be halved, the processing time required for the light output setting processing by the detection of the light output of these light emitting points to the feedback control is also required. Can be halved. Therefore, it is possible to obtain a high-quality image while minimizing fluctuations in image density.
[0006]
[Problems to be solved by the invention]
Each of the plurality of semiconductor laser arrays has a configuration in which a single collimator lens is disposed for a plurality of light emitting points, and the laser light from each light emitting point is converted into a parallel beam and incident on the scanning optical system. Is done. Here, the adjacent pitch of the beam spot row is determined by the sub-scanning magnification of the entire scanning optical system.
[0007]
However, in the case of Japanese Patent Laid-Open No. 7-72407, a beam spot between each semiconductor laser array synthesized by a beam splitter in a prism in a combination of a plurality of semiconductor laser arrays, a corresponding collimator lens, and a beam synthesis means. In order to suppress the deviation of the relative position of the row within an allowable value, it depends only on the alignment accuracy of the emission axis and the angle accuracy of the beam splitter surface and the reflecting surface of the prism, and there is a problem in mass productivity.
[0008]
In view of this, the present invention is a system using two semiconductor laser arrays, in which the alignment of beam spot rows between the semiconductor laser arrays can be freely adjusted, and this adjustment can be performed easily and reliably, and the assembly efficiency can be improved. An object is to provide a beam light source device.
[0009]
The present invention also provides a multi-beam light source device that can achieve the above object with higher accuracy.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a first semiconductor laser array having a plurality of light emitting points on a straight line, a second semiconductor laser array having the same structure as the first semiconductor laser, and the first semiconductor laser. A first collimator lens for coupling laser light emitted from the array, a second collimator lens for coupling laser light emitted from the second semiconductor laser array, and a first emission axis The first semiconductor laser array and the first coupling lens arranged symmetrically so that a plurality of light emitting points are separated in the sub-scanning direction are arranged on the first emission axis and the first The second semiconductor laser array in which a plurality of light emitting points are arranged symmetrically so as to be spaced apart in the sub-scanning direction with respect to a second emission axis that is separated from the single emission axis by a predetermined angle in the main scanning direction. And the second coupling lens are arranged on the second emission axis, and the arrangement directions of the light emitting points are respectively set in the planes orthogonal to the first emission axis and the second emission axis. In a plane perpendicular to the center of rotation determined so as to pass through a support member that holds these members together and an intermediate position between the first injection shaft and the second injection shaft. A holder member that holds the support member so that the rotation can be freely adjusted, and the rotation center scans a plurality of laser beams emitted from the first and second semiconductor laser arrays. It is characterized in that it is determined so as to coincide with the optical axis of a scanning optical system for forming a beam spot on the surface to be scanned .
[0011]
Therefore, the sub-scan relative position adjustment between the beam spot rows by the respective light emitting points of the first and second semiconductor laser arrays is performed by a simple operation of simply rotating the holder member about the optical axis of the scanning optical system. As a result, assembly efficiency is improved.
[0012]
According to a second aspect of the present invention, there is provided a first semiconductor laser array having a plurality of light emitting points on a straight line, a second semiconductor laser array having the same structure as the first semiconductor laser, and the first semiconductor laser. A first collimator lens for coupling laser light emitted from the array, a second collimator lens for coupling laser light emitted from the second semiconductor laser array, and a first emission axis The first semiconductor laser array and the first coupling lens, which are symmetrically arranged so that a plurality of light emitting points are separated in the sub-scanning direction, are arranged on the first emission axis and integrated with each other. The first support member that holds and forms the first light source unit, and the second light emitting points arranged symmetrically so as to be spaced apart from each other in the sub-scanning direction with respect to the second emission axis. With semiconductor laser array A second support member that forms a second light source unit by placing the second coupling lens on the second emission axis and holding the second coupling lens together; and the first and second semiconductor laser arrays. Beam synthesis in which a plurality of laser beams are emitted in the sub-scanning direction with respect to the optical axis of a scanning optical system for scanning a plurality of laser beams emitted from the laser beam to form a beam spot on a surface to be scanned And the light emission in each plane orthogonal to the first and second emission axes, with a predetermined angle between the first emission axis and the second emission axis with respect to the main scanning direction. and each defining a arrangement direction of the point, the first support member and the second supporting member and the holding and a beam combining means integrally together with the second injection shaft and the first injection shaft In a plane perpendicular to the center of rotation determined to pass the intermediate position between the axes Comprising a holder member having a freely Oite rotation adjustment, the rotation center, characterized in that determined to match the optical axis of the scanning optical system.
[0013]
Therefore, even in the system using the beam combining means, each light emitting point of the first and second semiconductor laser arrays can be simply operated by simply rotating the holder member around the optical axis of the scanning optical system. It is possible to adjust the sub-scanning relative position between the beam spot rows by improving the assembling efficiency.
[0014]
According to a third aspect of the present invention, in the multi-beam light source device according to the second aspect, the first and second support members can be freely adjusted to rotate about the corresponding first and second emission shafts. Is held by the holder member.
[0015]
Therefore, the sub-scanning pitches in the beam spot rows of the first and second semiconductor laser arrays can be individually adjusted, and high accuracy can be achieved, so that higher-quality image recording can be performed.
[0016]
According to a fourth aspect of the present invention, in the multi-beam light source device according to the first or second aspect, a plurality of light emitting points in the first and second semiconductor laser arrays are respectively arranged in the sub-scanning direction, and the scanned surface The distance between the first and second ejection axes is set to be twice or more the adjacent recording line pitch.
[0017]
Therefore, after adjusting the relative position in the sub-scanning direction between the beam spot columns of the semiconductor laser array, the change in the sub-scanning pitch in the beam spot column can be suppressed to an allowable value, and high accuracy can be achieved. Image recording is possible.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. First, as a premise of the present embodiment, an imaging relationship when a semiconductor laser array is used will be described with reference to FIGS. FIG. 1 is an explanatory diagram of an optical system showing the relationship between a light emitting point pitch Ps of a semiconductor laser array 1 having two light emitting points 1a and 1b and a sub-scanning pitch Ps' on a surface to be scanned (image surface such as a photoreceptor surface) 2. is there. f indicates the focal length of the collimator lens 3. A scanning optical system 4 has a sub-scanning magnification βs. Here, in order to obtain a predetermined sub-scanning pitch Ps ′ on the scanned surface 2, Ps = Ps ′ / βs on the light source surface of the semiconductor laser array 1, and the sub-scanning magnification βs is set according to the recording pitch. Become.
[0019]
Here, with respect to the semiconductor laser array 1, a semiconductor laser array having a relatively narrow emission point pitch of Ps = P between the two emission points 1a and 1b is used, and this is arranged in the sub-scanning direction as shown in FIG. The arrangement method and the one having a relatively wide pitch Ps between the two light emitting points 1a and 1b are used, and this is angled around the optical axis C (center between the light emitting points 1a and 1b) as shown in FIG. There is a method of arranging so that P · sin θ = Ps by tilting θ. The present invention can be applied to any method, but here, in order to simplify the description, an example of application to the former method is used.
[0020]
Under such a premise, a configuration example of the present embodiment will be described with reference to FIGS. FIG. 3 is an exploded perspective view of the multi-beam light source device of the present embodiment, and FIG. 4 is a longitudinal side view of the assembled state. This embodiment is configured as a four-beam light source device using two semiconductor laser arrays 11 and 12 (first and second semiconductor laser arrays) each having two light emitting points. These semiconductor laser arrays 11 and 12 are formed with the same structure. There are also provided collimator lenses 13 and 14 (first and second collimator lenses) for making a pair with these semiconductor laser arrays 11 and 12 and coupling the emitted light as parallel light to the scanning optical system. Yes.
[0021]
Further, a support member 15 that holds these members (semiconductor laser arrays 11 and 12 and collimator lenses 13 and 14) together is provided. This support member 15 is made of aluminum die-cast, and on the back side thereof, there are two stepped fitting holes 16 for press-fitting and supporting the semiconductor laser arrays 11 and 12 in parallel in the main scanning direction at intervals of 8 mm. Is formed. Here, the semiconductor laser arrays 11 and 12 are attached to the fitting holes 16 so that the two light emitting points are aligned in the sub-scanning direction. In addition, U-shaped support portions 17a and 17b for supporting the lens are formed so as to protrude continuously from the fitting holes 16 at the center portion on the front surface side of the support member 15. Here, alignment in the sub-scanning direction is performed so that two light emitting points are arranged symmetrically with respect to each of the emission axes a1 and a2 (first and second emission axes = lens center axis), and The alignment in the optical axis direction is performed so that the emitted light becomes a parallel light beam, and the U-shaped support portions 17a and 17b are filled with an ultraviolet curing adhesive 18 and cured, thereby collimating lenses 13 and 14. Is fixed.
[0022]
At this time, as shown in FIG. 4 in particular, the two fitting holes 16 are formed at an angle in the main scanning direction, so that the semiconductor laser array 11 and the collimator lens 13, the semiconductor laser array 12 and the collimator lens 14 are formed. By tilting the entire system, the exit axes a1 and a2 are formed so as to intersect in the vicinity of a polygon mirror (not shown), so that the surface to be scanned is as shown in FIG. The beam spot rows are separately formed with an interval x in the main scanning direction. In FIG. 5, 11 a and 11 b indicate beam spots formed by two light emitting points of the semiconductor laser array 11, and 12 a and 12 b indicate beam spots formed by two light emitting points of the semiconductor laser array 12.
[0023]
In addition, a holder member 19 that holds a support member 15 that holds the semiconductor laser arrays 11 and 12 and the collimator lenses 13 and 14 together is provided. The holder member 19 has a cylindrical portion 20 at the center on the front side for positioning to a predetermined support portion with the optical axis C of the scanning optical system as a rotation center, and a U-shape on the back side. A relief opening 21 for inserting the support portions 17 a and 17 b and the collimator lenses 13 and 14 is formed, and the support member 15 is fixed by a screw 23 screwed into the screw hole 22. Here, the support member 15 is positioned and fixed to the holder member 19 so that the semiconductor laser arrays 11 and 12 and the collimator lenses 13 and 14 are arranged symmetrically with respect to the optical axis C.
[0024]
According to such a configuration, the beam spot of each of the semiconductor laser arrays 11 and 12 can be set by simply rotating and adjusting the holder member 19 with the optical axis C of the scanning optical system as the rotation center and appropriately setting the tilt amount γ. The relative positions of the 11a and 11b rows and the beam spots 12a and 12b rows in the sub-scanning direction can be easily and accurately adjusted to a predetermined value. Therefore, the assembly efficiency is improved.
[0025]
In the example shown in FIG. 5, the image recording pitch p (= P / 2 = x · cosγ so that the beam spots 11a and 11b and the beam spots 12a and 12b are arranged in a staggered order in the order of 12a, 11a, 12b, and 11b. ) Is only shifted. At this time, the sub-scanning pitch p of the shortest spot of the beam spot row changes by δ = (n−1) P · (1−cosγ), where n is the number of beams, due to the tilt amount γ. Assuming that the sub-scanning relative position of the beam spot row is shifted by p as shown in FIG. 5, sinγ> p / x is obtained by the correction by the interval x. Therefore, in order to set the change amount δ of the sub-scanning pitch of the shortest spot to (n−1) P / 8 or less that does not affect the image quality, the interval x needs to be at least 2p.
[0026]
A second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is an exploded perspective view showing the multi-beam light source device of the present embodiment, and FIG. 7 is a longitudinal side view in the assembled state. This embodiment is applied to a multi-beam light source apparatus using beam combining means as in the case of the above-mentioned Japanese Patent Application Laid-Open No. 7-72407. Further, it is configured as a four-beam light source device using two semiconductor laser arrays 31 and 32 (first and second semiconductor laser arrays) each having two light emitting points. These semiconductor laser arrays 31 and 32 are formed with the same structure. There are also provided collimator lenses 33 and 34 (first and second collimator lenses) for making a pair with these semiconductor laser arrays 31 and 32 and coupling the emitted light as parallel light to the scanning optical system. Yes.
[0027]
In addition, a first holding member 35 that integrally holds the semiconductor laser array 31 and the collimator lens 33 and a second holding member 36 that integrally holds the semiconductor laser array 32 and the collimator lens 34 are provided. . These holding members 35 and 36 are both made of aluminum die cast and are formed in the same shape. Stepped fitting holes 37 for press-fitting and supporting the semiconductor laser arrays 31 and 32 are formed on the back surfaces of the holding members 35 and 36, respectively. The collimator lenses 33 and 34 each have a plurality of light emitting points of the semiconductor laser arrays 31 and 32 arranged in the sub-scanning direction and 2 with respect to the emission axes a1 and a2 (first and second emission axes = lens center axis). Alignment in the sub-scanning direction is performed so that the light emitting points are arranged symmetrically, and alignment in the optical axis direction is performed so that the emitted light becomes a parallel light flux, and the respective support members 35 and 36 are aligned. The U-shaped support portions 37 and 38 formed in the above are fixed by being filled with an ultraviolet curing adhesive 39 and cured. Thus, the semiconductor laser array 31, the collimator lens 33, and the support member 35 constitute the first light source unit 40, and the semiconductor laser array 32, the collimator lens 34, and the support member 36 constitute the second light source unit 41. ing.
[0028]
Further, there is provided beam combining means by a prism 42 combining a parallelogram column part 42a and a triangular column part 42b as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-72407. The prism 42 emits a plurality of laser beams emitted from the light emitting points of the first and second semiconductor laser arrays 31 and 32 in the vicinity of the optical axis C of the scanning optical system in the sub-scanning direction. A half-wave plate 43 is provided at an incident portion from the second semiconductor laser array 32 side. That is, the light emitted from the second semiconductor laser array 32 side is reflected by the hypotenuse of the parallelogram post 42a and then further reflected by the boundary surface with the triangular post 42b. The light is emitted from the prism 42 in a state close to the transmitted light from the first semiconductor laser array 31 side in the sub-scanning direction.
[0029]
Further, the holder member 4 4 for holding the light source unit 40, 41 and prism 42 of the first and second of these that have been unitized is provided. Here, the holder member 44 has a cylindrical portion 45 at the center on the front surface side, which is positioned so as to be rotatable and adjustable on a predetermined support portion with the optical axis C of the scanning optical system as the rotation center. A relief opening 47 for inserting the U-shaped support portions 37 and 38 and the collimator lenses 33 and 34 is formed continuously with the prism housing portion 46 into which the prism 42 enters, and is screwed into the screw hole 48. Support members 35 and 36 are fixed by screws 49. At this time, the mounting surfaces 42a and 42b of the holder member 42 to which the first and second support members 35 and 36 are mounted are angled in the main scanning direction as shown in FIG. Is formed so as to gradually spread toward the scanned surface. Therefore, on the surface to be scanned, as shown in FIG. 8, the beam spot rows are separately formed with an interval x in the main scanning direction. In FIG. 8, 31 a and 31 b indicate beam spots formed by two light emitting points of the semiconductor laser array 31, and 32 a and 32 b indicate beam spots formed by two light emitting points of the semiconductor laser array 32.
[0030]
According to such a configuration, the beam spot of each of the semiconductor laser arrays 31 and 32 can be simply set by appropriately adjusting the tilt amount γ by rotating the holder member 44 about the optical axis C of the scanning optical system. The relative positions of the 31a and 31b rows and the beam spots 32a and 32b rows in the sub-scanning direction can be easily and accurately adjusted to a predetermined value. Therefore, the assembly efficiency is improved.
[0031]
Further, in the present embodiment, cylindrical portions 35a and 36a are formed on the mounting surface of the holder member 44 with respect to the support members 35 and 36, and the cylindrical portions 35a and 36a that can be positioned with the respective injection axes a1 and a2 as the rotation centers are formed. Rotation adjustment can be made independently of each other. Thus, the sub-scanning magnification βs of the scanning optical system is set in advance so that the adjacent pitch P in each of the beam spots 31a and 31b and the beam spots 32a and 32b is P> 2p, so that the emission axes a1 and a2 are set. It is possible to accurately match the distance d (= P / 2 = P · cos α) in the sub-scanning direction between the beam spots 31a and 31b and the beam spots 32a and 32b by adjusting the tilt amount α with the rotation center as a center. It becomes. Furthermore, the beam spots 31a and 31b and the beam spots 32a and 32b can always be maintained in a constant posture depending on the tilt amount γ, and the sub-scanning pitch can be accurately maintained.
[0032]
The four laser beams emitted from the four-beam light source unit 48 configured in this way are deflected and scanned by the polygon mirror 50 via the cylinder lens 49 as shown in FIG. 4-line simultaneous recording is performed by forming an image on the surface of the photoconductor 54 that is a surface to be scanned by the fθ lens 52 and the toroidal lens 53 constituting the head 51. Reference numeral 55 denotes a reflection mirror. Reference numeral 56 denotes a synchronization detection sensor that receives laser light reflected by the detection mirror 57 outside the image area and synchronizes in the main scanning line direction.
[0033]
In these embodiments, the semiconductor laser array having two light emitting points is used as an example. However, the semiconductor laser array is not limited to two light emitting points, and a semiconductor laser array having three or more light emitting points is used. May be. In short, it is sufficient that a plurality of light emitting points are arranged on the same straight line at an equal pitch. Further, regarding the setting of the first and second emission axes a1 and a2, the second embodiment gradually spreads toward the scanned surface so that it intersects in the vicinity of the polygon mirror in the first embodiment. However, the present invention is not limited to this, and it is only necessary that the main scanning direction be separated by a predetermined angle.
[0034]
【The invention's effect】
According to the first aspect of the present invention, the beam spot array formed by the respective light emitting points of the first and second semiconductor laser arrays can be simply performed by simply rotating the holder member about the optical axis of the scanning optical system as the rotation center. It is possible to adjust the sub-scanning relative position between them, and to improve the assembly efficiency.
[0035]
According to the second aspect of the present invention, even in the system using the beam combining means, the first and second operations are simply performed by simply rotating the holder member around the optical axis of the scanning optical system. The relative position of sub-scanning between the beam spot rows by the respective light emitting points of the semiconductor laser array can be adjusted, and the assembling efficiency can be improved.
[0036]
According to a third aspect of the present invention, in the multi-beam light source device according to the second aspect of the present invention using beam combining means, the sub-scanning pitches in the beam spot columns of the first and second semiconductor laser arrays can be individually adjusted, Since accuracy can be improved, higher-quality image recording can be performed.
[0037]
According to a fourth aspect of the invention, in the multi-beam light source device according to the first or second aspect, the sub-scanning pitch in the beam spot row is adjusted after adjusting the relative position in the sub-scanning direction between the beam spot rows of the semiconductor laser array. Can be suppressed to an allowable value, and high accuracy can be achieved, so that high-quality image recording is possible.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an optical system showing a relationship between a light emitting point pitch Ps of a semiconductor laser array having two light emitting points and a sub-scanning pitch Ps ′ on a scanned surface as a premise of the present invention.
FIG. 2 is an explanatory diagram showing an arrangement method of a plurality of light emitting points.
FIG. 3 is an exploded perspective view showing the multi-beam light source device according to the first embodiment of the present invention.
FIG. 4 is a longitudinal side view in the assembled state.
FIG. 5 is an explanatory diagram showing a beam spot arrangement on a surface to be scanned.
FIG. 6 is an exploded perspective view showing a multi-beam light source device according to a second embodiment of the present invention.
FIG. 7 is a longitudinal side view in the assembled state.
FIG. 8 is an explanatory diagram showing a beam spot arrangement on a surface to be scanned.
FIG. 9 is a perspective view illustrating a configuration example of a laser printer.
[Explanation of symbols]
11 First semiconductor laser array 12 Second semiconductor laser array 13 First collimator lens 14 Second collimator lens 15 Support member 19 Holder member 31 First semiconductor laser array 32 Second semiconductor laser array 33 First Collimator lens 34 Second collimator lens 35 First support member 36 Second support member 40 First light source part 41 Second light source part 42 Beam combining means 44 Holder member

Claims (4)

A first semiconductor laser array having a plurality of light emitting points on a straight line;
A second semiconductor laser array having the same structure as the first semiconductor laser;
A first collimator lens for coupling laser light emitted from the first semiconductor laser array;
A second collimator lens for coupling laser light emitted from the second semiconductor laser array;
The first emission of the first semiconductor laser array and the first coupling lens in which a plurality of light emitting points are arranged symmetrically with respect to the first emission axis so as to be separated in the sub-scanning direction. A plurality of light emitting points are arranged symmetrically so as to be spaced apart in the sub-scanning direction with respect to the second emission axis that is arranged on the axis and spaced apart from the first emission axis by a predetermined angle in the main scanning direction. Further, the second semiconductor laser array and the second coupling lens are arranged on the second emission axis, and the first emission axis and the plane perpendicular to the second emission axis are within the planes. A support member for determining the arrangement direction of the light emitting points and holding these members together;
A holder for holding the support member so as to be adjustable in rotation within a plane orthogonal to a rotation center determined so as to pass through an intermediate position between the first injection shaft and the second injection shaft. comprising a member,
The rotation center coincides with the optical axis of a scanning optical system for scanning a plurality of laser beams emitted from the first and second semiconductor laser arrays to form a beam spot on the surface to be scanned. Multi-beam light source device defined in A first semiconductor laser array having a plurality of light emitting points on a straight line;
A second semiconductor laser array having the same structure as the first semiconductor laser;
A first collimator lens for coupling laser light emitted from the first semiconductor laser array;
A second collimator lens for coupling laser light emitted from the second semiconductor laser array;
The first emission of the first semiconductor laser array and the first coupling lens in which a plurality of light emitting points are arranged symmetrically with respect to the first emission axis so as to be separated in the sub-scanning direction. A first support member disposed on the shaft and integrally held to form a first light source unit;
The second emission is caused by the second semiconductor laser array and the second coupling lens arranged symmetrically so that a plurality of light emitting points are separated in the sub-scanning direction with respect to the second emission axis. A second support member disposed on the shaft and integrally held to form a second light source unit;
The plurality of laser beams are sub-scanned with respect to the optical axis of a scanning optical system for scanning a plurality of laser beams emitted from the first and second semiconductor laser arrays to form a beam spot on the surface to be scanned. Beam synthesizing means for emitting in the vicinity of the scanning direction ;
Spaced a predetermined angle and the front Symbol first injection shaft the second injection axis with respect to the main scanning direction, the first injection shaft, of the light emitting points in each plane perpendicular to the second injection shaft defining each array direction, inter-axis between the first both the support member and the second supporting member and the beam combining means and the holding together, the first injection shaft and the second injection shaft Bei example and a holder member having a rotatable adjustment in a plane orthogonal to the so-determined rotation center so as to pass through the intermediate position,
A multi-beam light source device in which the rotation center is determined to coincide with the optical axis of the scanning optical system .   3. The multi-beam light source device according to claim 2, wherein the first and second support members are held by the holder member so that the first and second support members can be adjusted to rotate about the corresponding first and second emission shafts. 4.   A plurality of light emitting points in the first and second semiconductor laser arrays are respectively arranged in the sub-scanning direction, and the interval between the first and second emission axes on the surface to be scanned is 2 adjacent to the recording line pitch. The multi-beam light source device according to claim 1 or 2, wherein the multi-beam light source device is set to be double or more.

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