JPH10282441A - Light source device and multibeam scanning optical device provided same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device and a multibeam scanning optical device having the small height of the device and equivqlent scanning performance by all light beams and facilitating the adjustment of an optical axis. SOLUTION: In a multibeam scanning optical device, collimator lenses 3a, 3b, cylindrical lenses 4a, 4b, folding mirrors 5a, 5b, a prism-shaped mirror 6 and a cylindrical relay lens 7 are arranged between semiconductor laser elements 2a, 2b and a polygon mirror 8 in the direction almost parallel with the main scanning plane of light beams L1, L2. The cylindrical lenses 4a, 4b and the folding mirrors 5a, 5b are fixed to a movable holding member 12 and enable the positional adjustment in X direction and Y direction.

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 a multi-beam scanning optical device provided with the light source device, and more particularly, to a light source device used for a digital copier, a laser beam printer and the like, and a multi-beam provided with the light source device. The present invention relates to a scanning optical device.

[0002]

2. Description of the Related Art In a multi-beam scanning optical device, for example, when an optical element such as a laser diode is used as a light source and the light beam of this optical element is to be emitted in the same direction, the optical elements are arranged too close to each other. In this case, the optical axis interval between the light beams becomes too large. For this reason, a configuration is known in which light beams are emitted from optical elements in mutually different directions, and then the light beams are deflected at appropriate intervals using reflection surfaces such as prism type mirrors.

For example, Japanese Patent Application Laid-Open No. 62-8118 discloses an example in which the above configuration is adopted. A parallel light beam emitted from a plurality of independent laser light sources and condensed by a condensing lens for forming a light beam (a collimator lens or the like). The converted laser beams are condensed by cylindrical lenses each having a refracting power in the sub-scanning direction, and a beam waist of each laser beam is generated on the reflecting surface of the prism type mirror. There has been proposed a multi-beam scanning optical device that reflects light from a surface, makes the light incident on a common cylindrical lens, and then emits the light toward the deflector.

[0004]

However, in the conventional scanning optical device described in the above publication, a plurality of laser light sources and a light beam shaping condenser lens are arranged in the sub-scanning direction. There is a problem that the dimension in the direction becomes large. In addition, since a light source and a condensing lens for shaping the light beam are used for each light beam, adjustment of the incident position and angle of the light beam incident on the two reflecting surfaces of the prism type mirror (so-called optical axis adjustment) is complicated. Met. This optical axis adjustment can also be performed by moving the prism type mirror in the optical axis direction. However, the movement of the prism mirror breaks the symmetry of the arrangement of the light beam optical path with respect to the optical axis in the sub-scanning direction.
For this reason, for example, there is a difference in the scanning performance among the plurality of light beams, for example, the intervals of the plurality of light beams on the surface to be scanned become uneven.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light source device in which the height of the device is small, the optical axis can be easily adjusted, and all light beams have the same scanning performance, and a multi-beam device having the light source device. It is to provide a scanning optical device.

[0006]

In order to achieve the above object, a light source device according to the present invention comprises (a) a plurality of light sources and (b) respective light beams emitted from the plurality of light sources. An optical system for converging light in at least one direction via a plurality of optical elements, and (c) a reflecting surface is disposed near a condensing position where the light beam is condensed, and (D) a prism-type mirror that reflects each of the incident light beams in substantially the same direction and emits the reflected light beams;
And a holding mechanism for integrally holding the plurality of optical elements included in the optical system so as to be movable.

Here, as the optical element, for example,
A folding mirror for deflecting a plurality of light beams toward the reflecting surface of the prism type mirror or a lens element for condensing a plurality of light beams on the reflecting surface of the prism type mirror is used. . Further, the optical system includes a condenser lens for shaping the light beam emitted from the light source into either substantially parallel light or substantially convergent light, respectively.

With the above arrangement, the plurality of light sources, the plurality of optical elements, and the prism type mirror are arranged in a direction substantially parallel to the light beam scanning surface, and the height of the light source device can be reduced. Therefore, the height dimension of the multi-beam scanning optical device provided with this light source device is also reduced.

[0009] Further, by using a holding mechanism for holding a plurality of optical elements included in the optical system so as to be movable integrally, the optical elements such as a folding mirror and a lens element are moved in parallel with respect to the scanning plane of the light beam. Accordingly, the incident points of the plurality of light beams incident on the prism mirror move by the same distance in the same direction along the optical path. Therefore, it becomes easy to adjust the interval between the plurality of light beams on the surface to be scanned. Further, by using the holding mechanism to move the optical element in a direction perpendicular to the light beam scanning surface, the optical path lengths of the plurality of light beams up to the prism mirror are increased or decreased by the same length. Accordingly, it is possible to correct the relative position interval between the cylinder lens and the cylinder relay lens disposed before and after the optical element and the prism type mirror, so that the scanning performance (for example, spot diameter) between a plurality of light beams becomes equal. It is adjusted to.

[0010] Further, by making the angle between the adjacent reflecting surfaces of the prism type mirror an acute angle, the angle of reflection on the reflecting surface of the prism type mirror is reduced, and the height of the light source device is further reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a light source device according to the present invention and a multi-beam scanning optical device provided with the light source device will be described with reference to the accompanying drawings. In each embodiment, the same components and the same portions are denoted by the same reference numerals.

[First Embodiment, FIG. 1] FIG. 1 shows an optical arrangement of a multi-beam scanning optical device 1 in a sub-scanning direction. As shown in FIG. 1, the multi-beam scanning optical device 1 includes two semiconductor laser elements 2a, 2b, two collimator lenses 3a, 3b, and two cylinder lenses 4a,
4b, two folding mirrors 5a, 5b, one prism-type mirror 6, and a cylinder relay lens 7, a single polygon mirror 8, a scanning lens 9,
And a movable holding member 12.

The two semiconductor laser elements 2a and 2b are juxtaposed at a predetermined distance in the sub-scanning direction. The semiconductor laser element 2a, the collimator lens 3a, the cylinder lens 4a, and the folding mirror 5a are arranged in the direction parallel to the optical axis C emitted from the prism type mirror 6 (hereinafter, referred to as X direction) and in FIG. It is arranged above the optical axis C. Similarly, the semiconductor laser element 2b, the collimator lens 3b, the cylinder lens 4b, and the folding mirror 5b are also arranged in the X direction in order and below the optical axis C in FIG. An arrangement from the semiconductor laser element 2a to the turning mirror 5a in accordance with the optical path of the light beam L1 emitted from the semiconductor laser element 2a;
The arrangement from the semiconductor laser element 2b to the turning mirror 5b in accordance with the optical path of the light beam L2 emitted from b.
Optically symmetric with respect to the prism type mirror 6.

The movable holding member 12, as shown in FIG.
It is composed of a first movable holding table 12a, a second movable holding table 12b, and a base 12c. The base 12c is fixed on the vertical reference plane 22 of the housing by screws or the like. First
The cylinder lenses 4a and 4b and the folding mirrors 5a and 5b are fixed on the movable holding table 12a. The first movable holder 12a has a pair of elongated holes 13 and is mounted on the second movable holder 12b by screws 14 so that the position can be adjusted in the X direction. Similarly, the second movable holding table 12b has a pair of elongated holes 15 so that the position can be adjusted on the base 12c in a direction orthogonal to the X direction on a horizontal plane (hereinafter, referred to as Y direction). It is attached by screws 16.

The prism type mirror 6 has a triangular cross section and a vertical angle of a right angle, and two surfaces 6a and 6b sandwiching the vertical angle are reflection surfaces. Further, a cylinder relay lens 7 is arranged between the prism type mirror 6 and the polygon mirror 8,
A scanning lens 9 is disposed between the polygon mirror 8 and the photosensitive drum 20. The cylinder relay lens 7 has a positive refractive power only in the sub-scanning direction, similarly to the cylinder lenses 4a and 4b. The cylinder relay lens 7 condenses the light beam near the reflection position of the prism mirror 6 and near the deflection position of the polygon mirror 8.

In the multi-beam scanning optical device 1, the light beams L1 and L2 emitted from the semiconductor laser elements 2a and 2b travel in the X direction parallel to the optical axis C, and in the main scanning direction and the sub scanning direction. Are shaped into parallel light (or convergent light) by the collimator lenses 3a and 3b both having a positive refractive power. The light beams L1 and L2 emitted from the collimator lenses 3a and 3b enter the return mirrors 5a and 5b via the cylinder lenses 4a and 4b having a positive refractive power only in the sub-scanning direction. The light beams L1 and L2 reflected by the folding mirrors 5a and 5b travel toward the optical axis C in a direction perpendicular to the optical axis C and gather near the reflection positions of the reflection surfaces 6a and 6b of the prism type mirror 6. Light. The light beams L1 and L2 reflected by the reflecting surfaces 6a and 6b of the prism type mirror 6 are combined in the same traveling direction (X direction), but come close to each other at intervals of several tens of μm in the sub-scanning direction. proceed.

The light beams L1 and L2 reach the polygon mirror 8 via the cylinder relay lens 7. The cylinder relay lens 7 condenses the light beams L1 and L2 in the vicinity of the reflection surface of the polygon mirror 8 in a long linear shape in the main scanning direction. The polygon mirror 8 is driven to rotate at a constant angular velocity. The light beams L1 and L2 are deflected and scanned at a constant angular velocity on each reflecting surface based on the rotation of the polygon mirror 8, and pass through the scanning lens 9. Thereafter, the light beams L1 and L2 are
The image is formed on the upper side, and scanning is performed in the main scanning direction. That is, in this optical system, two lines are simultaneously written in one scan.

The scanning lens 9 applies the light beams L1 and L2 deflected at an equal angular velocity by the polygon mirror 8 to the photosensitive drum 20.
It has a function of correcting the above main scanning speed to a constant speed (distortion aberration correction). The photoconductor drum 20 is driven to rotate at a constant speed in the direction of arrow c, and the main scanning in the direction perpendicular to the direction of arrow c by the polygon mirror 8 and the scanning lens 9 and the sub-scanning of the photoconductor drum 20 in the direction of arrow c. An image (electrostatic latent image) is written on the photosensitive drum 20 by scanning.

The multi-beam scanning optical device 1 having the above-described configuration includes the semiconductor laser element 2a to the folding mirror 5a.
Direction of arrangement and semiconductor laser element 2b to folding mirror 5
Since the arrangement direction of b is substantially parallel to the main scanning plane,
The height of the light source device can be reduced, and thereby the height of the multi-beam scanning optical device 1 can be reduced.

Further, the movable holding member 12 allows the cylinder lenses 4a, 4b and the return mirrors 5a, 5b to move without changing the mutual positional relationship, thereby facilitating the optical axis adjustment. For example, as shown in FIG.
By moving the first movable holding table 12a toward the polygon mirror 8 in a direction parallel to the optical axis C, the cylinder lens 4a,
The positions of the mirror 4b and the mirrors 5a and 5b are changed to the positions 4a ', 4b', 5a 'and 5b' indicated by dotted lines, respectively. Thereby, the incident points Pa and Pb of the light beams L1 and L2 incident on the prism mirror 6 move toward the polygon mirror 8 by the same distance in the same direction along the optical path. Therefore, the light beams L1 and L2 reflected by the reflecting surfaces 6a and 6b of the prism type mirror 6 have a narrow interval in the sub-scanning direction.

Conversely, when the first movable holding table 12a is moved toward the semiconductor laser elements 2a and 2b in a direction parallel to the optical axis C, the light beam L emitted from the prism type mirror 6 becomes
The distance between L1 and L2 in the sub-scanning direction can be increased.
Thus, the two light beams L on the photosensitive drum 20
The distance between L1 and L2 can be adjusted accurately and easily with little loss of light quantity.

Further, as shown in FIG. 4, the second movable holding table 12b is moved vertically downward in FIG. 4 so that the cylinder lenses 4a and 4b and the folding mirrors 5a and 5a are moved.
Positions 4a 'and 4 in which the position of 5b is indicated by dotted lines
b ', 5a', 5b '. Thus, the light beam L1 from the cylinder lens 4a to the prism type mirror 6
Becomes shorter by the length d, and conversely, the light path length of the light beam L2 from the cylinder lens 4b to the prism mirror 6 becomes longer by the length d. Therefore, the folding mirror 5
a, 5b and the relative positions of the cylinder lenses 4a, 4b and the cylinder relay lens 7 disposed before and after the prism mirror 6 can be corrected.
It is possible to precisely and easily adjust the scanning performance (for example, spot diameter) between L1 and L2 to be equal.

Although the optical axis can be adjusted by moving the prism type mirror 6, since the focal positions of the cylinder lenses 4a and 4b are shifted, the light beams L1 and L2 are shifted.
There is a problem that a difference in scanning performance easily occurs between L2. Further, there is a problem that the space between the semiconductor laser element 2a to the folding mirror 5a and the semiconductor laser element 2b to the folding mirror 5b is narrow, and it is difficult to install a mechanism for moving the prism type mirror 6 and to adjust the mechanism.

[Second Embodiment, FIG. 5] As shown in FIG. 5, the multi-beam scanning optical device 31 has two light emitting points 3
A semiconductor laser element 32 having 2a, 32b, a collimator lens 33, and two prism mirrors 34, 38, 4
A light source device including a plurality of return mirrors 35a, 35b, 37a, 37b, two cylinder lenses 36a, 36b, and a cylinder relay lens 7, a polygon mirror 8,
It comprises a scanning lens 9 and a movable holding member 42.

The semiconductor laser element 32 has two light emitting points 3
2a and 32b are arranged so as to be separated by a predetermined distance in the sub-scanning direction. The semiconductor laser element 32, the collimator lens 33, the prism type mirrors 34 and 38, and the cylinder relay lens 7 are sequentially arranged in the direction of the optical axis C emitted from the prism type mirror 38. Similarly, folding mirror 35a, cylinder lens 36a, folding mirror 37
a are also arranged sequentially in the X direction and above the optical axis C in FIG. Further, the turning mirror 35b, the cylinder lens 36b, and the turning mirror 37b are also arranged in order in the X direction and below the optical axis C in FIG.
The arrangement from the light emitting point 32a to the turning mirror 37a along the optical path of the light beam L1 emitted from the light emitting point 32a, and the arrangement from the light emitting point 32b to the turning mirror 37b according to the optical path of the light beam L2 emitted from the light emitting point 32b. , Optically symmetric with respect to the prism mirror 38.

The movable holding member 42 includes a movable base 42b,
And a holding table 42a vertically fixed to the movable base 42b. The cylinder lenses 36a and 36b and the folding mirrors 37a and 37b are fixed on the holding table 42a. The movable base 42b has a pair of elongated holes 44, and the optical axis C is provided on the horizontal reference surface (floor surface) 23 of the housing.
Is attached by a screw 45 so that the position can be adjusted in the X direction parallel to. Note that the position of the movable holding member 42 can also be adjusted in a direction perpendicular to the optical axis C (the same applies to the following embodiments). The prism mirrors 34 and 38 have a right angle at the apex, and two surfaces sandwiching the apex are reflection surfaces.

In the multi-beam scanning optical device 31 having the above configuration, the light beams L1 and L2 emitted from the light emitting points 32a and 32b
Then, the light enters the prism type mirror 34 through the third mirror 3. The light beams L1 and L2 reflected by the prism type mirror 34 travel in a direction perpendicular to the optical axis C and in directions opposite to each other, and then are reflected by the folding mirrors 35a and 35b.
Travel in the X direction parallel to. Further, the light beam L
1 and L2 enter the return mirrors 37a and 37b via the cylinder lenses 36a and 36b.

The light beams L1 and L2 reflected by the folding mirrors 37a and 37b travel toward the optical axis in the Y direction perpendicular to the optical axis C, and are collected near the reflection position of the reflection surface of the prism mirror 38. Light. The light beams L1 and L2 reflected by the reflecting surface of the prism type mirror 38 are combined in the same traveling direction (X direction), but travel close to each other at intervals of several tens of μm in the sub-scanning direction. The multi-beam scanning optical device 31 having the above configuration has the same operation and effect as the multi-beam scanning optical device 1 of the first embodiment.

[Third Embodiment, FIG. 6] As shown in FIG. 6, a multi-beam scanning optical device 51 is substantially the same as the device 1 of the first embodiment except for a prism type mirror 52 and a movable holding member 53. belongs to. Prism mirror 52
Has two sharp reflecting surfaces 5 sandwiching the apex angle.
The reflection angles of the light beams L1 and L2 reflected by the light beams 2a and 52b can be reduced. Accordingly, the height of the light source device can be further reduced as compared with the light source device of the first embodiment, and the multi-beam scanning optical device 51 with a further reduced height can be obtained.

The movable holding member 53 has a set of long holes 54 and is attached to a vertical reference plane of the housing or the like by screws 56 so that the position can be adjusted in the X direction parallel to the optical axis C. On the movable holding member 53, a folding mirror 5 is provided.
a and 5b are attached so that the angle can be adjusted in the direction indicated by arrow Z in the figure. Thereby, the optical axis adjustment can be performed more easily and accurately.

[Fourth Embodiment, FIG. 7] As shown in FIG. 7, a multi-beam scanning optical device 61 is similar to the device 31 of the second embodiment except for prism type mirrors 62 and 63 and a movable holding member 64. It is almost the same. The prism type mirrors 62 and 63 have an acute apex angle,
The reflection angles of the light beams L1 and L2 reflected by the 63 reflection surfaces can be reduced. Therefore, the height of the light source device can be further reduced as compared with the light source device of the second embodiment, and the multi-beam scanning optical device 61 with a further reduced height can be obtained.

The movable holding member 64 has a pair of elongated holes 65, and is attached to a vertical reference plane or the like of the housing by screws 66 so that the position can be adjusted in the X direction parallel to the optical axis C. On the movable holding member 64, the folding mirror 3
7a and 37b are attached so as to be adjustable in angle in the direction indicated by arrow Z in the figure. Thereby, the optical axis adjustment can be performed more easily and accurately.

A movable holding member 67 indicated by a dotted line is used in place of the movable holding member 64, and the cylinder lenses 36a and 36b are mounted on the movable holding member 67 in addition to the folding mirrors 37a and 37b. Is also good. Further, instead of the two prism-type mirrors 62 and 63, a single prism-type mirror having a rhombic cross section may be used.

[Fifth Embodiment, FIG. 8] In the fifth embodiment,
A multi-beam scanning optical device including a light source device using two semiconductor laser elements and one collimator lens will be described. As shown in FIG. 8, the two semiconductor laser elements 2a and 2b are juxtaposed at a predetermined distance in the sub-scanning direction. The collimator lens 72, the prism type mirror 73, and the cylinder relay lens 7
3 are arranged sequentially in a direction parallel to the optical axis C emitted from the optical axis C. On the other hand, the two cylinder lenses 4a and 4b are arranged so as to be inclined with respect to the optical axis C, and folding mirrors 5a and 5b are arranged behind the cylinder lenses 4a and 4b. The movable holding member 74 has a pair of elongated holes 75 and is attached to a vertical reference plane or the like of the housing by a screw 76 so that the position can be adjusted in the X direction. On the movable holding member 74, folding mirrors 5a and 5b are indicated by arrows Z in the figure.
It is mounted so that the angle can be adjusted in the direction indicated by.

The traveling directions of the light beams L1 and L2 emitted from the two semiconductor laser elements 2a and 2b are inclined with respect to the optical axis C in the plane in the sub-scanning direction.
After crossing at the position 2, the prism mirror 73 is passed through the cylinder lenses 4a and 4b and the return mirrors 5a and 5b.
Is condensed in the vicinity of the reflection position of the reflection surface. The light beams L1 and L2 reflected by the reflecting surface of the prism type mirror 73 travel in the same direction (X direction). The multi-beam scanning optical device 71 having the above configuration has the same operation and effect as the multi-beam scanning optical device 1 of the first embodiment.

[Sixth Embodiment, FIG. 9] As shown in FIG. 9, the multi-beam scanning optical device 81 has two light emitting points 3
A light source device including a semiconductor laser element 32 having 2a and 32b, a collimator lens 82, two cylinder lenses 4a and 4b, a triangular prism 83, an optical path shortening lens group 84, and a cylinder relay lens 85;
, A movable holding member 87, and a scanning lens (not shown).

The semiconductor laser device 32 has two light emitting points 3
2a and 32b are arranged so as to be separated by a predetermined distance in the sub-scanning direction. The semiconductor laser element 32, the collimator lens 82, the triangular prism 83, the optical path shortening lens group 84, and the cylinder relay lens 85 are sequentially arranged in the direction of the optical axis C emitted from the prism 83. The cylinder relay lens 85 has a positive refractive power only in the sub-scanning direction, and focuses a light beam near the refraction position of the triangular prism 83 and near the deflection position of the polygon mirror 8. On the other hand, the two cylinder lenses 4a and 4b are arranged so as to be inclined with respect to the optical axis C. The movable holding member 87 has a pair of elongated holes 88 and is attached to a vertical reference plane or the like of the housing by screws 89 so that the position can be adjusted in the X direction. A prism 83 is mounted on the movable holding member 87.

In this multi-beam scanning optical device 81, the light beam L emitted from the light emitting points 32a and 32b
1 and L2 are incident surfaces 83 of a triangular prism 83 via a collimator lens 82 and cylinder lenses 4a and 4b.
a, 83b. The light beams L1 and L2 that have passed through the triangular prism 83 are condensed in the form of a long line in the main scanning direction near the reflection surface of the polygon mirror 8 via the optical path shortening lens group 84 and the cylinder relay lens 85. The multi-beam scanning optical device 81 having the above configuration has the same operation and effect as the device 1 of the first embodiment, and does not need to use a folding mirror. Therefore, the number of parts can be reduced, and furthermore, the number of components of the device can be reduced. The size can be reduced.

[Other Embodiments] It should be noted that the light source device according to the present invention and the multi-beam scanning optical device provided with the light source device are not limited to the above-described embodiment, but may be variously modified within the scope of the invention. be able to. The movable holding base of the movable holding member, in addition to the method of moving using the elongated hole,
A method using a guide plate for movement may be used.

[0040]

As is apparent from the above description, according to the present invention, a plurality of light sources, a plurality of optical elements, and a prism type mirror are arranged in a direction substantially parallel to the light beam scanning surface. The height of the device can be reduced. Therefore, the height dimension of the multi-beam scanning optical device including the light source device can be reduced. In addition, the provision of the holding mechanism that integrally and movably holds the plurality of optical elements included in the optical system allows easy adjustment of the optical axis. For example, it is possible to easily adjust the intervals between a plurality of light beams on the surface to be scanned, and adjust the scanning performance between the plurality of beams to be equal.

Further, by making the angle formed between the adjacent reflecting surfaces of the prism type mirror an acute angle, the angle of reflection on the reflecting surface of the prism type mirror is reduced, and the height dimension of the light source device can be further suppressed.

[Brief description of the drawings]

FIG. 1 is an optical arrangement diagram in a sub-scanning direction showing a first embodiment of a light source device according to the present invention and a multi-beam scanning optical device including the light source device.

FIG. 2 is a front view of the movable holding member shown in FIG. 1;

FIG. 3 is an explanatory diagram of an optical axis adjustment performed by moving a movable holding member in an X direction.

FIG. 4 is an explanatory diagram of an optical axis adjustment performed by moving a movable holding member in a Y direction.

FIG. 5 is an optical arrangement diagram in a sub-scanning direction showing a second embodiment of a light source device and a multi-beam scanning optical device including the light source device according to the present invention.

FIG. 6 is an optical arrangement diagram in a sub-scanning direction showing a third embodiment of a light source device and a multi-beam scanning optical device including the light source device according to the present invention.

FIG. 7 is an optical arrangement diagram in a sub-scanning direction showing a fourth embodiment of a light source device according to the present invention and a multi-beam scanning optical device including the light source device.

FIG. 8 is an optical arrangement diagram in a sub-scanning direction showing a fifth embodiment of a light source device according to the present invention and a multi-beam scanning optical device including the light source device.

FIG. 9 is an optical arrangement diagram in a sub-scanning direction showing a sixth embodiment of a light source device according to the present invention and a multi-beam scanning optical device including the light source device.

[Explanation of symbols]

1, 31, 51, 61, 71, 81 multi-beam scanning optical device 2a, 2b, 32 semiconductor laser element 32a, 32b light emitting point 3a, 3b, 33, 72, 82 collimator lens 4a, 4b, 36a, 36b: cylinder lens 5a, 5b, 35a, 35b, 37a, 37b: folding mirror 6, 34, 38, 52, 62, 63, 73: prism type mirror 7, 85: cylinder relay lens 8: polygon mirror 9: scanning lens 12, 42, 53, 64, 74, 87: movable holding member L1, L2: light beam

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 1/113 H04N 1/04 104Z

Claims (6)

[Claims] 1. A plurality of light sources, and respective light beams emitted from the plurality of light sources,
An optical system for condensing light in at least one direction via a plurality of optical elements; and a reflecting surface arranged near a condensing position where the light beam is condensed, and each light incident on the reflecting surface. A light source device, comprising: a prism-type mirror that reflects a beam in substantially the same direction and emits the beam; and a holding mechanism that integrally and movably holds a plurality of optical elements included in the optical system. 2. The light source device according to claim 1, wherein the optical element is a folding mirror for deflecting the plurality of light beams toward a reflection surface of the prism type mirror. 3. The light source device according to claim 1, wherein the optical element is a lens element for condensing a plurality of light beams on a reflection surface of the prism type mirror. 4. The light source device according to claim 1, wherein the optical system includes a condenser lens for shaping a light beam emitted from the light source into substantially parallel light or substantially convergent light. . 5. The light source device according to claim 1, wherein an angle between adjacent reflection surfaces of the prism type mirror is an acute angle. 6. The light source device according to claim 1, wherein the light source device deflects a plurality of light beams emitted from the light source device. A multi-beam scanning optical device, comprising: a deflector;