JP2000249949A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device by which operation for exchanging a light source and operation for optical axes alignment of the light source with a coupling lens, etc., after the exchange can be facilitated and also the recycling characteristic of the light source and the coupling lens can be remarkably improved, so that cost can be reduced. SOLUTION: Two semiconductor lasers 10a and 10b are force-fitted into two force-fitting holes 14a and 14b respectively disposed on a supporting body 12 to be attachably/detachably held. Notches 18a and 18b are respectively disposed on the two holes 14a and 14b, and four canopy-shaped protruding parts 20a and 20b are respectively disposed at regular intervals around the holes 14a and 14b in a concentric circular state. The two coupling lenses 22a and 22b and the lasers 10a and 10b adjusted in optical axes by a collimator, and are respectively stuck and fixed to the one part 20a or 20b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device, and more particularly to a light source device of a multi-beam type optical scanning device used for a digital copying machine, a laser printer, and the like.

[0002]

2. Description of the Related Art A conventional optical scanning device generally scans a photosensitive member with a single light beam. However, in order to increase the recording speed as compared with the case of scanning with a single light beam. A multi-beam optical scanning device configured to simultaneously scan using a plurality of light beams has been put to practical use.

As such a multi-beam optical scanning device, there is, for example, a multi-beam optical scanning device described in Japanese Utility Model Application Laid-Open No. 62-109134. This actual opening 6
The multi-beam optical scanning device described in Japanese Patent Application Laid-Open No. 2-109134 has two semiconductor lasers, an optical system for performing beam shaping, and an optical system for making polarization directions of beams from the respective semiconductor lasers perpendicular to each other. A multi-beam optical scanning device that includes a polarizing beam splitter that combines these two beams and simultaneously scans two lines on a photoconductor via a polygon mirror and an imaging optical system, wherein the main scanning direction of the two beams is And a first unit having a pitch adjustment unit in the sub-scanning direction.
Unit including the imaging optical system after the polygon mirror
And a unit structure that can be separated and combined.

However, the above-mentioned Japanese Utility Model Application Laid-Open No.
In the conventional multi-beam type optical scanning device described in Japanese Patent Publication No. 134, a plurality of single beam light source devices in which a light source and a collimator lens are integrally supported are used, and a polarized light is provided in an optical scanning device housing. Since the beams are combined by being incident on the beam splitter from directions orthogonal to each other, there is a problem that the apparatus becomes large. Also,
Since the adjustment of the optical axis is performed while the light source devices are supported on different wall surfaces, when the light source device is replaced, adjustment work or the like for aligning the optical axis must be performed again. There is a problem that replacement work is troublesome and workability is poor.

In order to solve such a problem, a multi-beam type optical scanning device described in Japanese Patent Application Laid-Open No. 7-72407 has been proposed. This Japanese Unexamined Patent Publication No. 7
The multi-beam type optical scanning device proposed in Japanese Patent Application Laid-Open No. 72407/1990 has two semiconductor lasers, a collimator lens that converts light beams from these semiconductor lasers into parallel light beams, and emits these light beams in an overlapping manner. A multi-beam type optical scanning device having a beam synthesizing means for performing scanning by simultaneously repeating two light beams, wherein the two semiconductor lasers, the collimator lens, and the beam synthesizing means are substantially integrated. The optical scanning device is formed so as to be detachable from the optical scanning device housing.

As described above, the above-mentioned Japanese Patent Application Laid-Open No. 7-72407
In the conventional multi-beam type optical scanning device proposed in Japanese Patent Application Laid-Open Publication No. H10-209, it is possible to integrally support two semiconductor lasers, a collimator lens, and a beam synthesizing unit. Since it is possible to appropriately determine the arrangement of the beams, the size of the apparatus can be reduced, and the workability of aligning the optical axis after the replacement of the light source device is not required, thereby greatly improving the workability.

[0007]

However, in the conventional multi-beam type optical scanning device proposed in Japanese Patent Laid-Open No. 7-72407, as shown in the embodiment, two light sources as light sources are used. The semiconductor lasers are fixed to different supports, respectively, and are joined to the same base by using screws. The two collimator lenses are housed in a lens barrel, and are adhered and fixed to the same base. In the case where the two semiconductor lasers and the two bases in which the two collimator lenses contained in the lens barrel are integrally fixed are to be replaced, the optical axis after the replacement is certainly Although the alignment work becomes unnecessary and the workability is remarkably improved, if one semiconductor laser becomes unusable due to deterioration or failure, for example, it is continued from the viewpoint of effective use of resources. If you try to replace only the semiconductor laser becomes impossible use, there is a problem that replacement of the light source device is not easy.

That is, it is possible to replace only the semiconductor laser that has deteriorated or has failed, but since the two collimator lenses are housed in a lens barrel and are fixedly adhered to the base, they are replaced after replacement. The optical axis collimation of the new semiconductor laser and the corresponding collimator lens hardly coincide with each other, and it is almost impossible to correct the deviation of the optical axis collimator. As a result, even when only one semiconductor laser cannot be used continuously, it is extremely difficult to continuously use both collimator lenses. In addition, the semiconductor laser that has not deteriorated or failed can be used continuously as it is, but for that purpose, it is placed in a lens barrel and aligned with a new collimator lens that is adhered and fixed to the base, and then re-used. It becomes necessary to perform optical axis collimation adjustment. As described above, if it is attempted to replace only the semiconductor laser that has become unusable, the replacement of the light source device becomes extremely complicated.

Further, in the conventional multi-beam type optical scanning device proposed in the above-mentioned Japanese Patent Application Laid-Open No. 7-72407, compared with an optical scanning device which performs scanning with only one light source produced in large numbers. However, since there are few components that can be used in common, there is a problem that the manufacturing cost increases.

Further, not only the conventional multi-beam type optical scanning device proposed in the above-mentioned Japanese Patent Application Laid-Open No. 7-72407, but also in a general optical scanning device, the position accuracy of a semiconductor laser as a light source is reduced. In order to maintain and simplify the configuration, a semiconductor laser is often press-fitted into a hole opened in the support and fixed. In this case, from the viewpoint of recycling, even if the press-fitted semiconductor laser that has not deteriorated or failed is removed from the support and reused, it is extremely difficult to remove the semiconductor laser. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and simplifies the work of exchanging a light source and the operation of aligning an optical axis between a light source and a coupling lens after the exchange. An object of the present invention is to provide a light source device capable of remarkably improving the recyclability of lenses and realizing cost reduction.

[0012]

The above object is achieved by the following light source device according to the present invention. In other words, the light source device according to claim 1 is an optical scanning device that couples a plurality of light beams emitted from a plurality of light sources by a plurality of coupling lenses, and performs scanning using the plurality of light beams simultaneously. In the light source device, a plurality of light sources are press-fitted into a plurality of holes provided on the same support and are detachably held, and a plurality of coupling lenses are bonded to a projection member provided on the support. The light sources are fixed so as to coincide with the optical axes of a plurality of light beams emitted from the plurality of light sources, respectively.

As described above, in the light source device according to the first aspect, the plurality of light sources are press-fitted and held in the plurality of holes provided on the same support, and the plurality of coupling lenses are provided on the support. A plurality of light sources and a plurality of coupling lenses corresponding to these light sources can be easily and collectively held on the support by a simple structure with a small number of parts, by being adhered and fixed to the formed projection member. For,
The size of the device can be reduced, and the cost can be reduced.

Further, since a plurality of light sources are detachably held on the same support, even when a specific light source among the plurality of light sources needs to be replaced or repaired due to deterioration, failure or the like. Only the light source that has become unusable can be replaced with a new light source. Further, in this case, even after the replacement of the light source, even if it is necessary to perform the optical axis collimation adjustment of the coupling lens again so as to coincide with the optical axis of the light beam emitted from the new light source,
It becomes possible to remove the corresponding coupling lens from the projection member of the support and reuse it. Therefore, it is not necessary to discard a large unit including a light source and a coupling lens and replace it with a new unit as in the conventional case, and it is possible to continue using other normal components such as a light source and a coupling lens. Therefore, effective use of resources is realized from the viewpoint of recycling.

According to a second aspect of the present invention, in the light source device according to the first aspect, each of the plurality of holes provided in the support is provided with a notch. .

In the light source device according to the second aspect of the present invention, the plurality of light sources are press-fitted and each of the plurality of holes of the support is provided with a notch, thereby providing a plurality of light sources. Can be extremely easily attached to and detached from the same support. That is, when replacing a specific light source that has become unusable, when removing the light source from the hole in the support, the notch provided in the hole causes the hole diameter to change due to deformation within the elastic range of the support. Is temporarily expanded so that the light source can be easily removed without rendering the support unusable. The same applies when a new light source to be replaced is inserted into the hole of the support and attached. Thus,
Through the notches provided in each of the plurality of holes provided in the support, the attachment and detachment of the light source to and from the plurality of holes can be performed extremely easily.

According to a third aspect of the present invention, in the light source device according to the first or second aspect, a plurality of protrusion members are provided for each of the plurality of coupling lenses. And

As described above, in the light source device according to the third aspect, a plurality of protrusion members for bonding the plurality of coupling lenses to the support are provided for each of the plurality of coupling lenses. Therefore, after replacing a specific light source that has become unusable, if the optical axis collimation adjustment of the coupling lens is re-adjusted to match the optical axis of the light beam emitted from the new light source, Coupling lenses can be bonded using other unused projection members that are pre-maintained with precision without reusing used projection members that are likely to deform when removing the lens Therefore, the work of aligning the optical axis of the light source and the coupling lens after the replacement becomes extremely easy.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described. FIG. 1 is a schematic perspective view showing a light source device of a multi-beam optical scanning device according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a part of FIG. In FIG. 1, each component is illustrated separately in the drawing for easy understanding.

As shown in FIG. 1, two semiconductor lasers 10a and 10b as light sources are respectively supported by support members 12a and 10b.
Are press-fitted into two press-fitting holes 14a and 14b provided therein, and are detachably held. Notches 16a and 16b are provided in the two press-fit holes 14a and 14b provided in the support 12, respectively. Then, these two press-fit holes 14a, 14b and notches 16a, 1
The shape and arrangement position of 6 b are point-symmetric with respect to the center of the support 12. The two semiconductor lasers 10a and 10b held by the support 12 are connected to a control board 18 on which a drive circuit for the two semiconductor lasers 10a and 10b is formed.

The two press-fit holes 14a of the support 12
Four eave-shaped projections 20a and 20b are arranged around the periphery of 14b at equal intervals on a concentric circle, respectively. However, in FIG. 1, only one eave-shaped protrusion 20a, 20b is shown to avoid complication of the drawing. The two coupling lenses 22a and 22b for coupling the light beams emitted from the two semiconductor lasers 10a and 10b are connected to the optical axes of the light beams emitted from the two semiconductor lasers 10a and 10b, respectively. The support members 12 are aligned and adjusted in the optical axis direction, and are adhered and fixed to one eave-shaped protrusion 20a, 20b around the two press-fit holes 14a, 14b of the support 12.

In this manner, the support 12 has two press-fit holes 10a and 10b, each of which has two semiconductor lasers 10a and 10a.
10b is press-fitted and held, and two coupling lenses 22a,
22b are respectively adhered and fixed. In addition, a plurality of screw holes 24 are provided in the support 12.

The base 26 is provided with two through holes 28a and 28b for penetrating the two coupling lenses 22a and 22b fixed to the support 12, and two types of through holes 28a and 28b. A plurality of screw holes 30, 32 are provided. Then, these two through holes 28a, 28
In a state where the coupling lenses 22a and 22b respectively penetrate through the support b, the support 12 is screwed to the base 26 by screws (not shown) penetrating the plurality of screw holes 24 and 30.

As shown in FIG. 2, the two semiconductor lasers 10a and 10b and the two coupling lenses 22a and 22b are fixed to the support 12 in a state where the optical axes are adjusted to collimate with each other. Body 12
Are screwed to the base 26.

As shown in FIG. 1, an aperture 34 is provided on the side of the base 26 opposite to the support 12. The aperture 34 has two shapings for shaping the light beams emitted from the two semiconductor lasers 10a and 10b on the extension of the optical axis of each of the two coupling lenses 22a and 22b. Slit 36a,
36b are provided respectively.

Also, these two shaping slits 36a,
The polarization plane of the light beam emitted from the semiconductor laser 10b is placed on one shaping slit 36b of the
A half-wave plate 38 for rotating by an angle is provided.

The two semiconductor lasers 10a and 10b
From the coupling lens 22a,
A beam combining means 40 for combining two light beams passing through 2b, the shaping slits 36a and 36b, and the half-wave plate 38 is fixed and installed in the flange portion 42. The flange 42 has a plurality of screw holes 44 and a cylindrical projection 46 for engaging with an optical scanning device housing (not shown).

Then, the base 26 has a plurality of screw holes 32,
A screw (not shown) penetrating through 44 is screwed to the flange 42 that houses the beam combining means 40. Therefore, the aperture 34 and the half-wave plate 38
Is sandwiched and fixed between the base 26 and the flange portion 42. The flange portion 42 is screwed to the optical scanning device housing engaged via the cylindrical projection 46 with the same screw.

As described above, the two semiconductor lasers 10 connected to the control board 18 on which the drive circuit is formed
a, 10b and two coupling lenses 22a, 22
b are fixed to the same support 12 with their optical axes aligned, and this support 12 is screwed to the base 26,
Is screwed to the flange 42 accommodating the beam combining means 40 through an aperture 34 provided with two shaping slits 36a and 36b and a half-wave plate 38, thereby forming a multi-beam type. The light source device of the optical scanning device is configured. Then, this light source device is engaged with the optical scanning device housing via the cylindrical projection 46, and is fixed by screwing.

Next, the operation of the light source device of the multi-beam optical scanning device shown in FIGS. 1 and 2 will be described. First, light beams are respectively emitted from the two semiconductor lasers 10a and 10b connected to the control board 18 on which the drive circuit is formed. These two semiconductor lasers 10a,
The two light beams emitted from 10b are coupled to two coupling lenses 22a, 22a whose optical axis is collimated.
2b are respectively incident and coupled.

Next, the two light beams coupled by the two coupling lenses 22a and 22b are respectively formed into a predetermined beam diameter by two shaping slits 36a and 36b provided in the aperture 34. Be shaped. And of these two light beams,
Only one light beam emitted from the semiconductor laser 10b is rotated by 90 ° in the polarization plane by the half-wave plate 38.

Next, two shaping slits 36a, 36
After being shaped into a predetermined beam diameter by b, one of the light beams as they are and the other light beam whose polarization plane has been rotated by 90 ° by the half-wave plate 38 both enter the beam combining means 40. And synthesized.

Next, the two light beams combined by the beam combining means 40 are sent to a scanning section of a multi-beam type optical scanning device, and are used as a plurality of light beams capable of simultaneous scanning.

Next, the two semiconductor lasers 10a and 10b
The following describes the procedure of replacement and repair in the event that continuous use becomes impossible due to deterioration, failure, or the like. First, the control board 18 to which the two semiconductor lasers 10a and 10b are connected is removed.

Next, the semiconductor laser which has become unusable and needs to be replaced, for example, the semiconductor laser 10a,
2 is removed from the press-fit hole 14a. At this time, since the notch 16a is provided in the press-fit hole 14a, the hole diameter can be temporarily expanded by the deformation of the support 12 within the elastic range. Therefore, there is no need to remove the coupling lenses 22a and 22b and push out the semiconductor laser 10a from the opposite side as in the related art, so that the press-fitting hole 14a of the support 12 is plastically deformed and becomes large. The semiconductor laser 10a can be easily removed without making use impossible.

Next, the newly prepared semiconductor laser 10
a into the press-fitting hole 14 a of the support 12. At this time, since the notch 16a is provided in the press-fitting hole 14a, the hole diameter is temporarily expanded by deformation of the support 12 within the elastic range, similarly to the case of removal from the press-fitting hole 14a. , The semiconductor laser 10a can be easily
Into the press-fitting hole 14a.

The semiconductor lasers 10a, 10a
When replacing b, the shapes and arrangement positions of the two press-fit holes 14a, 14b and notches 16a, 16b provided in the support 12 are point-symmetric with respect to the center of the support 12. Therefore, the two semiconductor lasers 10a and 10b
When replacing any one of the semiconductor lasers, the same procedure can be used. In addition, since the harness position of the control board 18 can be rotated by 180 ° due to the point symmetry of the shapes and arrangement positions of the press-fit holes 14a and 14b and the like, the semiconductor laser unit is commonly used for each model. Even in this case, the harness distribution can be optimized so as not to be affected by noise or the like.

Next, the newly replaced semiconductor laser 10
It is checked whether the optical axis collimation between a and the corresponding coupling lens 22a is shifted. If there is no deviation in the optical axis collimation, it is only necessary to attach the control board 18 to the two semiconductor lasers 10a and 10b as they are, but in many cases, it is expected that the optical axis collimation is deviated. Is done. In this case, the semiconductor laser 10a and the coupling lens 22
It is necessary to redo the optical axis collimation adjustment with a.

In order to perform the optical axis collimation adjustment again, the coupling lens 22a must be once removed from one used eaves-like projection 20a provided around the press-fit hole 14a of the support 12. No. However, at the time of its removal, stress acts on the eaves-like projection 20a to which the coupling lens 22a is adhered,
Deformation is likely to occur. Therefore, even if the coupling lens 22a is re-adhered to the same eave-shaped projection 20a, it is difficult to perform optical axis collimation adjustment.

Therefore, when re-adhering the coupling lens 22a, of the four eaves-like projections 20a arranged at equal intervals on the concentric circle around the press-fitting hole 14a, three unused eaves-like projections 20a are used. One of the eave-shaped projections 20a is selected and the coupling lens 22a is bonded. In this case, since these three unused eaves-like projections 20a are all maintained in advance in accuracy, the semiconductor laser 10
The adjustment of the optical axis collimation between a and the coupling lens 22a becomes extremely easy.

Next, the newly replaced semiconductor laser 10
After performing the optical axis collimation adjustment between the laser diode a and the coupling lens 22a, the control substrate 18 is attached to the two semiconductor lasers 10a and 10b, and the semiconductor laser 10a and the new semiconductor laser 10a that cannot be used continuously are connected. Complete the replacement work.

As described above, according to the light source device of the multi-beam optical scanning device according to the present embodiment, the two semiconductor lasers 10a and 10b as light sources are press-fitted into the two press-fit holes 14a and 14b of the support 12, respectively. And the two coupling lenses 22a and 22b are bonded and fixed to one eave-shaped projection 20a and 20b around the two press-fit holes 14a and 14b, respectively. Accordingly, the two semiconductor lasers 10a and 10b and the two coupling lenses 22a and 22b corresponding thereto are collectively held on the same support 12 by a simple structure having a small number of parts, so that the apparatus can be downsized. Achieved, cost reduction can be realized.

Also, two semiconductor lasers 10a, 10b
Are press-fitted into the two press-fit holes 14a, 14b of the support 12 and are detachably held, so that one of the two semiconductor lasers 10a, 10b, for example, the semiconductor laser 10a is deteriorated or malfunctioned. Even when replacement and repair are required, only the semiconductor laser 10a that has become unusable can be replaced with a new light source. Also, in that case, after replacing the semiconductor laser 10a,
Even if the optical axis collimation between the new semiconductor laser 10a and the corresponding coupling lens 22a needs to be adjusted again, the coupling lens 22a can be removed from the eaves-like projection 20a of the support 12 and reused. Become. For this reason, the semiconductor lasers 10a, 10a, 1
There is no need to discard the entire unit including the Ob and the coupling lens 22a, 22b and replace it with a new unit, and the other semiconductor laser 10b and the normal parts of the coupling lens 22a, 22b can be used as they are. Therefore, effective utilization of resources can be realized from the viewpoint of recycling.

The two semiconductor lasers 10a and 10b
Press-fit holes 14a, 14
Since the notches 16a and 16b are provided in the b, for example, the semiconductor laser 10a which has become unusable and needs to be replaced can be removed from the press-fit hole 14a,
When a new semiconductor laser 10a is press-fitted into the press-fitting hole 14a, the hole diameter can be temporarily expanded by deformation of the support 12 within the elastic range. 14a.

Further, the two press-fit holes 14a, 14b and the notches 16a, 16b provided in the support 12 are point-symmetric with respect to the center of the support 12 because the shapes and the positions of the notches 16a, 16b are symmetrical. When replacing any one of the two semiconductor lasers 10a and 10b, the same procedure can be used, and the harness position of the control board 18 can be rotated by 180 °. Even when the laser unit is commonly used for each model, the harness distribution can be optimized so as not to be affected by noise or the like.

The two press-fit holes 14a of the support 12
14b, two coupling lenses 22a, 2
Eave-like projections 20 for bonding and fixing the respective 2b
a, 20b are arranged at equal intervals on the concentric circle, that is, four eaves-like projections 20a, 20b actually used in addition to each other, each of which is previously held with precision as a spare Since the three eave-shaped protrusions 20a and 20b are provided, the newly exchanged semiconductor laser 10a
When re-adjusting the optical axis collimation with the corresponding coupling lens 22a, when the coupling lens 22a is once removed from the used eaves-like projection 20a, even if the eaves-like projection 20a is deformed, Since it is sufficient to select one of the three unused eaves-like projections 20a which are maintained in advance in precision and adhere the coupling lens 22a, the semiconductor laser 10
The adjustment of the optical axis collimation between a and the coupling lens 22a can be performed very easily.

In the light source device of the multi-beam optical scanning device according to the above embodiment, a case has been described where two semiconductor lasers emitting one light beam are used in one package as the light source. The number of semiconductor lasers to be used is not limited to two, and a laser array in which more semiconductor lasers are arranged in one package may be used as a light source. In addition to the case where one laser array is used as a light source, a plurality of laser arrays, that is, a plurality of packages having one laser array may be arranged and used as a light source.

In the light source device of the multi-beam optical scanning device according to the above embodiment, two coupling lenses 22a and 22b are directly adhered to the eave-shaped projections 20a and 20b of the support 12, respectively. Although fixed, for example, two coupling lenses 22a, 22b
May be fixed to the support 12 via other components such as enclosing them in a lens barrel.

Further, in the light source device of the multi-beam type optical scanning device according to the above embodiment, two semiconductor lasers 10a and 10b and two coupling lenses 22a,
The support 12 to which the base 22b is fixed is screwed to the base 26, and the base 26 is screwed to the flange 42 accommodating the beam synthesizing means 40, so that the light source device of the multi-beam optical scanning device is The light source device is assembled into an optical scanning device housing, and the support 12 to which the two semiconductor lasers 10a and 10b and the two coupling lenses 22a and 22b are fixed is formed as one unit. The unit may be directly assembled to the optical scanning device housing.

[0050]

As described above, according to the light source device of the present invention, the following effects can be obtained. That is, according to the light source device of the first aspect, the plurality of light sources are press-fitted and held in the plurality of holes provided on the same support, and the plurality of coupling lenses are provided on the support. Since the plurality of light sources and the plurality of corresponding coupling lenses can be easily and collectively held on the same support by a simple structure with a small number of parts by being adhered to the projection member, the apparatus , And cost reduction can be realized.

Further, since a plurality of light sources are detachably held on the same support, even if a specific light source among the plurality of light sources requires replacement and repair, it cannot be used continuously. It is possible to replace only the light source that became possible with a new light source, in which case the optical axis collimation of the coupling lens so that it matches the optical axis of the light beam emitted from the new light source after replacement Even when it is necessary to redo the adjustment, the corresponding coupling lens can be removed from the projection of the support and reused, so that each large unit including the light source and the coupling lens as in the related art can be used. There is no need to discard and replace with a new unit, and normal parts such as other light sources and coupling lenses can be used as they are. It is possible to realize the effective use of resources from.

According to the light source device of the second aspect,
The notch is provided in each of the plurality of holes of the support in which the plurality of light sources are press-fitted and held, so that when exchanging the light source, the light source can be removed from the holes of the support or the holes can be removed. When the light source is inserted into the hole, the hole diameter can be temporarily expanded by deformation within the elastic range of the support, so that the light source can be easily attached to and detached from the hole.

Further, according to the light source device of the third aspect,
By providing a plurality of projection members for adhering the plurality of coupling lenses to the support for each of the plurality of coupling lenses, a light beam emitted from a new light source after replacement is provided. When re-adjusting the optical axis collimation of the coupling lens so that it coincides with the optical axis, it is possible to maintain the precision in advance without reusing the used projection member that is likely to deform when removing the coupling lens. Because it is possible to bond the coupling lens using other unused protrusion members,
The optical axis alignment work between the light source and the coupling lens after the replacement can be performed extremely easily.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a light source device of a multi-beam optical scanning device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a part of a light source device of the multi-beam optical scanning device of FIG.

[Explanation of symbols]

 10a, 10b Semiconductor laser 12 Support 14a, 14b Press-fit hole 16a, 16b Notch 18 Control board 20a, 20b Eave-shaped protrusion 22a, 22b Coupling lens 24 Screw hole 26 Base 28a, 28b Through hole 30, 32 Screw hole 34 Aperture 36a, 36b Shaping slit 38 1/2 wavelength plate 40 Beam combining means 42 Flange 44 Screw hole 46 Cylindrical projection

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Kojima 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company (72) Inventor Hiroyuki Suhara 1-3-6 Nakamagome, Ota-ku, Tokyo Share Inside Ricoh Company (72) Inventor Tomoya Osugi 1-3-6 Nakamagome, Ota-ku, Tokyo F-term in Ricoh Company (reference) 2H045 BA22 BA23 BA32 BA41 BA42 CB24

Claims (3)

[Claims] 1. A light source device of an optical scanning device, wherein after a plurality of light beams emitted from a plurality of light sources are respectively coupled by a plurality of coupling lenses, scanning is performed simultaneously using the plurality of light beams. A plurality of light sources are press-fitted into a plurality of holes provided on the same support and are detachably held, and the plurality of coupling lenses are adhered to a projection member provided on the support. A light source device, wherein the light sources are fixed so as to coincide with optical axes of the plurality of light beams emitted from the plurality of light sources, respectively. 2. The light source device according to claim 1, wherein a notch is provided in each of the plurality of holes provided in the support. 3. The light source device according to claim 1, wherein a plurality of the protrusion members are provided for each of the plurality of coupling lenses.