JPH06160748A - Optical scanner - Google Patents

Abstract

PURPOSE:To enable even a collimator lens which is required for high-density recording, whose diameter is comparatively large and whose focal distance is long to be fitted without deteriorating assemblability. CONSTITUTION:In an optical scanner provided with a laser light source 1 consisting of a semiconductor laser 2 and the collimator lens 3 converting the divergent luminous flux of the laser 2 to the collimated luminous flux, a laser supporting body 21 supporting the laser 2 and a lens supporting body 28 supporting the lens 3 are provided. Besides, a lens barrel 22 which is obtained by fitting the supporting bodies 21 and 28 to both ends thereof and which is freely fitted to the outside surface of a device housing in a vertical direction to the optical axis of the lens 3 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical scanning device used in a laser plotter, a printer section of a digital copying machine, or the like.

[0002]

2. Description of the Related Art In recent years, laser technology has been actively used in various fields, and as one of them, a laser light source such as a semiconductor laser has come to be used for optical writing for image recording. There is. That is, as disclosed in Japanese Unexamined Patent Publication No. 3-33712, a laser light source including a semiconductor laser and a collimator lens that converts a divergent light flux of this semiconductor laser into a parallel light flux is provided, and the light flux emitted from this laser light source is provided. The deflecting and reflecting surface of the deflector (polygon mirror) rotating at a high speed causes the deflective scanning in the main scanning direction.
While the deflected light flux is converged by a scanning lens system such as an fθ lens, a surface to be scanned such as a photoconductor is main-scanned at a constant speed to perform optical writing. However,
In this type of optical scanning device, the resolution is usually about 240 to 480 dots / inch (dpi), and there are various problems in achieving a resolution of 1000 dpi or more, which is comparable to electronic plate making.

[0003]

First, the beam diameter d incident on the scanning lens system including the fθ lens is approximately d.
≈ (4λf / π) × (dpi / 25.4) × k (where λ: wavelength of light source, f: focal length of scanning lens, k: coefficient) As (dpi increases), the beam diameter d also increases. Further, in order to obtain a uniform spot diameter on the surface to be scanned, it is necessary to flatten the image forming surface, that is, reduce the curvature of field, and the angle of view of the scanning lens must be reduced. As a result, the focal length f is increased.

By the way, for mounting the laser light source,
For example, as disclosed in Japanese Patent Laid-Open No. 61-175617, in a laser light source including a lens support for supporting a collimator lens and a laser support for positioning a semiconductor laser on the optical axis of the collimator lens, It is general that the support is formed in a flange shape and is positioned and fixed in the optical axis direction from the outside of the device housing (optical box).
As described above, the method of mounting and fixing the laser light source on the side surface of the apparatus housing is not applicable to the high-density optical scanning apparatus that requires a collimator lens, aperture, and focal length that are about 10 times those of the conventional method. Have difficulty.

Second, there is a problem that the smaller the beam spot diameter on the surface to be scanned, the shallower the beam depth, and the deviation of the optical path length due to the dimensional accuracy of the apparatus housing cannot be ignored.

Third, according to the above-mentioned Japanese Patent Laid-Open No. 3-33712, etc., between the scanning lens system and the surface to be scanned,
A long toroidal lens is provided in cooperation with the scanning lens system to substantially form the deflected light beam on the surface to be scanned and to correct the field curvature in the sub-scanning direction. Due to the eccentricity, there is a problem of scanning line bending such that the image forming position is not linear but curved.

Fourth, there is an adverse effect due to temperature. In general, the oscillation wavelength of a semiconductor laser changes depending on the temperature, and the imaging position changes with the wavelength change of the optical element. here,
If the scanning lens system is composed of a combination of a plurality of lenses, it can be designed as an achromatic type at the time of its design. Since the line image forming system for forming a line image long in the direction is composed of a single-lens cylinder lens, there is a problem that the focal length changes due to the wavelength change. Even in the laser light source itself, the distance between the semiconductor laser and the collimator lens changes due to thermal expansion, and the parallelism of the emitted light flux is deviated due to the change of the focal length due to the wavelength, and the imaging position changes. There is a problem that it will end up.

After all, these problems cause variations in the beam spot diameter and the spot position on the surface to be scanned, which causes a deterioration in image quality.
Countermeasures for high-density and high-quality image formation are required.

[0009]

According to a first aspect of the present invention, there is provided an optical scanning device including a laser light source including a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux. An optical axis of the collimator lens with respect to the outer surface of the apparatus housing, the laser support and the lens support supporting the collimator lens are provided, and the laser support and the lens support are attached to both ends. A lens barrel that can be attached in a direction perpendicular to the.

In addition, in the invention described in claim 2, there is provided detection means for detecting the parallelism of the light beam emitted from the laser light source and transmitted through the collimator lens, and is interposed between the lens support and the lens barrel. A piezoelectric element whose expansion and contraction is controlled by the output of the detection means is provided.

According to the invention of claim 3, a laser light source comprising a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux, and a light flux from the laser light source side is deflected in the main scanning direction. A deflector having a deflecting / reflecting surface for scanning, and a line which is located near the deflecting / reflecting surface and forms a parallel light beam emitted from the laser light source into a long line image in the main scanning direction to enter the deflecting / reflecting surface. In an optical scanning device including an image forming system and a scanning lens system that converges a light beam deflected by the deflector while scanning the surface to be scanned at a uniform speed, the line image forming system is arranged in the sub-scanning direction. It is formed by a concave mirror having a curvature.

According to another aspect of the present invention, a laser light source including a semiconductor laser and a collimator lens that converts a divergent light flux of the semiconductor laser into a parallel light flux, and a light flux emitted from the laser light source is deflected and scanned in a main scanning direction. In a light scanning device including a deflector having a deflecting / reflecting surface for causing a deflected light beam to be converged by the deflector, and a scanning lens system for performing main scanning at a constant speed on a surface to be scanned, a light scanning device having 90
A roof-shaped reflecting means is provided which has two reflecting surfaces forming an angle and forms a folded optical path from the scanning lens system toward the surface to be scanned, and the position adjusting is such that the reflecting means is adjustable in the optical axis direction. Means were provided.

In a fifth aspect of the present invention, a laser light source including a semiconductor laser and a collimator lens that converts a divergent light flux of the semiconductor laser into a parallel light flux, and a light flux emitted from the laser light source is deflected and scanned in a main scanning direction. An optical scanning device comprising: a deflector having a deflecting / reflecting surface for causing a deflected light beam to be converged by the deflector; A long toroidal lens, which is positioned between the scanning surface and a shape that corrects the field curvature in the sub-scanning direction while forming a deflected light beam on the surface to be scanned by cooperation with the scanning lens system, An undulation adjusting means for adjusting the undulation in the sub-scanning direction of the long toroidal lens is provided.

[0014]

According to the first aspect of the present invention, with respect to the laser light source, a lens barrel is provided between the laser support and the lens support, the support being attached to both ends of the lens support. Since it can be mounted in the direction orthogonal to the optical axis, even a collimator lens with a relatively large aperture and a long focal length can be mounted without impairing the assemblability, and it can be used for high-density recording. It can be applied to a scanning device.

In this case, according to the invention of claim 2,
The parallelism of the emitted light of the semiconductor laser is monitored by the detecting means, and the piezoelectric element interposed in the laser light source is expanded and contracted according to the detection result of the detecting means, so that the thermal expansion of the lens barrel and the oscillation wavelength change of the semiconductor laser Even if the parallelism is deviated due to, for example, the correction can be properly performed, and the image formation position does not change due to the influence of the temperature, so that a high-density and high-quality image can be obtained.

Further, in the third aspect of the invention, since the line image forming system for forming the line image is formed by the concave mirror having the curvature in the sub-scanning direction, the influence of the change in the refractive index of the material is affected. Therefore, even if the light source wavelength changes, the image forming position does not change, and a high-density and high-quality image can be obtained.

In a fourth aspect of the invention, a roof-shaped reflecting means for forming a folded optical path from the scanning lens system toward the surface to be scanned is provided, and the position adjusting means is capable of adjusting the reflecting means in the optical axis direction. Since the image forming light beam position can be aligned on the surface to be scanned, it is possible to cancel the dimensional error due to the processing accuracy of the apparatus housing, the variation in the focal position of the scanning lens system, and the like, and The parallelism of the beam can be reliably maintained before and after incidence, and a high-density and high-quality image can be obtained.

Further, in the invention according to claim 5,
A long toroidal lens having a shape that corrects the field curvature in the sub-scanning direction while forming an image of the deflected light beam on the surface to be scanned in cooperation with the scanning lens system, and the undulation in the sub-scanning direction can be adjusted by the undulation adjusting means. Since it is provided so that the influence of the inclination of the image forming light beam and the inclination due to the attachment of the scanning lens system can be canceled, the deterioration of the image due to the bending of the main scanning line can be prevented, and the high density and high quality can be achieved. The image will be obtained.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, the basic configuration of the optical system in the optical scanning device to which this embodiment is applied will be described with reference to FIGS. This is disclosed in, for example, Japanese Patent Laid-Open No. 3-33712. First, the semiconductor laser 2 that constitutes the laser light source 1 is described.
And a collimator lens 3 are provided. Therefore, the laser light source 1 converts the divergent light flux from the semiconductor laser 2 into a parallel light flux by the collimator lens 3 and emits it. A cylinder lens 5 into which a parallel light flux emitted from such a laser light source 1 is incident via an aperture 4 is provided. The cylinder lens 5 forms a parallel light beam from the laser light source 1 as a long line image in the main scanning direction. The cylinder lens 5 has a deflective reflection surface 6 in the vicinity of the image formation position and is rotationally driven. A polygon mirror (deflector) 7 is provided.

Therefore, the light beam is deflected and scanned in the main scanning direction as the polygon mirror 7 rotates at a high speed, and such a deflected light beam is scanned at a constant speed on the photosensitive member (scanned surface) 8. An fθ lens system (scanning lens system) 9 including a plurality of lenses is provided. Furthermore, this f
A long toroidal lens (barrel-shaped toroidal lens) 1 having a shape that corrects the field curvature in the sub-scanning direction while substantially forming an image of the deflected light flux on the photoconductor 8 in cooperation with the θ lens system 9.
0 is provided. 11 is a long toroidal lens 10
This is a mirror for deflecting the light flux that has passed through to the surface of the photoconductor 8 side.

Reference numeral 12 is a synchronization mirror located outside the effective image area in the main scanning direction.
A sync detector 13 is provided for receiving the reflected light from the device and generating a sync signal in the main scanning direction.

In this embodiment, however, it is made clear how the optical system capable of exhibiting the same function as that of the above structure is constructed and how the optical system is assembled. .

First, a polygon mirror 7 and its polygon motor 14 and an optical box (apparatus housing) 15 having a substantially rectangular shape and having an upper opening, in which the fθ lens system 9 is mounted at a predetermined position, are provided. The attachment portion of the polygon mirror 7 is partitioned by a cylindrical partition wall 16 having a middle height, and only the side facing the fθ lens system 9 is opened by an opening 16a.

An outer surface portion of the optical box 15 adjacent to the partition wall 16 has a step shape and serves as a mounting portion 17 for the laser light source 1. Here, in the laser light source 1, as shown in FIG. 1, first, the semiconductor laser 2 is press-fitted into the hole of the laser supporting body 21, and the end surface 22 a of the lens barrel 22 having a square cylindrical shape is inserted through the laser supporting body 21. It is fixed by screwing to the screw 23. At this time, the laser support 21
On the inner surface side of the, a projection 21a is formed to enter the lens barrel 22. A drive circuit board 24 for the semiconductor laser 2 is attached to the lower surface of the lens barrel 22 with a screw 25, and a flexible printed cable 26 pulled out from one end of the drive circuit board 24 in a bent state makes electrical connection with the semiconductor laser 2. Has been secured. On the other hand, the collimator lens 3 housed in a lens cell 27 having an external thread formed on the outer periphery is supported via the lens cell 27 in a lens support body 28 having an internal thread. The lens support 28 has a protrusion 28a that is inserted into the lens barrel 22 on the inner surface side.
The lens barrel 22 is aligned with the other end surface 22b of the lens barrel 22, and is fixed to the lens barrel 22 by screws 29 and washers 30. In this embodiment, the lens barrel 2
A piezoelectric element 31, which has a rectangular frame shape and expands and contracts in the optical axis direction, is interposed between 2 and the lens support 28.

Here, the lens barrel 22 is attached to the lower surface of the mounting portion 17 of the optical box 15 by a screw 32 in a direction perpendicular to the optical axis direction of the collimator lens 3 (upward direction). Reference surfaces 22c that come into contact with the mounting portion 17 are bent and formed at four corners on the upper surface side.

Therefore, in the laser light source 1 as described above, the semiconductor laser 2 and the collimator lens 3 are arranged on the optical axis of the collimator lens 3 with respect to the lens barrel 22 via the supports 21 and 28, respectively. After being assembled so as to be positioned in the optical box 1, the cylindrical portion 28b of the lens support 28 is attached to the optical box 1.
It is inserted into the optical box 15 through the hole 33 on the back side of the optical disc 5, and is fixed to the mounting portion 17 with the screw 32. At this time, the gap between the laser light source 1 and the hole 33 of the optical box 15 is shielded by the shield member 34.

Further, the polygon mirror 7 is assumed to have, for example, six deflection reflecting surfaces 6, and the polygon motor 1
As shown in FIG. 5, 4 is screwed and fixed to the optical box 15 from below by screws 35 as in the laser light source 1 described above.

By the way, in the optical box 15, there is provided a half mirror 41 which is positioned on the optical axis of the laser light source 1 and has a deflection angle of 45 °, and a scanning light beam 42 and a parallelism detecting light beam 43 are provided. It is configured to be divided into two.
On the optical axis of the scanning light beam 42 reflected by the half mirror 41, instead of the cylinder lens 5, a concave mirror 44 forming a linear image forming system is fixed by a leaf spring 45 and a screw 46. Here, the concave mirror 44 has a curvature in the sub-scanning direction as shown in FIG. 6, is located in the vicinity of the deflecting / reflecting surface 6 of the polygon mirror 7, and deflects the scanning light beam 42 to deflect and reflect these. The light is reflected in a state of forming a line image toward the surface 6.

An fθ lens system 9 arranged at a position where a light beam deflected by the deflecting / reflecting surface 6 of the polygon mirror 7 is incident.
4 is positioned on each lens by screwing a fixing member 47 formed to cover these fθ lens system 9 to a boss 49 on the optical box 15 side with a screw 48, as shown in FIG. It is set so as to be pressed and fixed by the leaf spring portion 50.

Further, in the optical box 15, there are two reflecting surfaces 51a and 51b which form 90 ° in the sub-scanning direction on the exit side of the fθ lens system 9 so as to reflect the light flux emitted from the fθ lens system 9. A roof-shaped mirror (reflecting means) 51 that forms a folding optical path toward the photoconductor 8 is provided with different heights corresponding to the folding heights of 51a and 51b. Such a mirror 51 is attached to the end portion of the optical box 15 by a supporting member 52, but as shown in FIG. 7, the fixing portion 52a of the supporting member 52 is different from the pin 53 erected from the bottom surface of the optical box 15. A long hole 52b is formed so as to be freely slidable in the optical axis direction, and a long hole 52c into which the screw 54 is inserted is also formed. This allows the mirror 51
Position adjusting means 55 is configured to attach and fix the optical axis in the optical axis direction so that the position can be adjusted. Therefore, by adjusting the position of the mirror 51 in the optical axis direction by the position adjusting means 55, the optical path length can be adjusted, and the convergent position can be set / adjusted so as to be on the surface of the photoconductor 8. The two reflecting surfaces 51a and 51b are supported by the support member 52 by a leaf spring 56.

As shown in FIG. 8, the folding optical path by the mirror 51 is set so as to pass through the upper portion of the partition wall 16 in the optical box 15, and the exit for the photoconductor 8 is sufficiently large in the main scanning direction. A slit-shaped exit window 61 having a wide opening width is formed. Such an exit window 61
Long toroidal lens 10 on the return optical path just before
Is provided. As shown in FIG. 9, the long toroidal lens 10 is formed by integrally molding a lens portion 10a and a rib portion 10b surrounding the lens portion 10a with a resin. Optical box 15
10 is formed with a U-shaped recess 62 formed at a predetermined position on the inner wall of the base plate, and has a lower end arc-shaped projection 10c that is engaged with the recess 62.
As shown in FIG. 5, the protrusion 10c is set to be pressed and fixed by the leaf spring 64 attached to the optical box 15 by the screw 63. Therefore, long toroidal lens 1
0 is oscillating around the protrusion 10c engaged with the recess 62. On the other hand, in the lower rib portion 10b,
A groove 10d is formed in the center of the left and right sides of the groove 1d.
For 0d, stepped screw 65, optical box 15, rib 1
0b and a bent leaf spring 66 are provided so as to constitute the undulation adjusting means 67. That is, by adjusting the tightening amount of the stepped screw 65, the rotational eccentricity of the long toroidal lens 10, that is, the undulation in the sub-scanning direction can be adjusted. This is to correct the scan line bend 68 on the photoconductor 8. The long toroidal lens 10 and the exit window 6 of the optical box 15
1 and a shield member 6 for shielding the gap
9 is interposed.

By the way, in this embodiment, the optical box 1
5, the parallelism detection light beam 4 by the half mirror 41
A transmission window 71 is formed on the optical axis of 3, and a detection means 72 is attached to the outside of the transmission window 71 with a screw 73. As shown in FIGS. 11 and 12, the detecting means 72 is provided with a toric lens 74 and a four-division photodiode 75, and detects the parallelism of the light flux by the collimator lens 3.

The operation principle will be described with reference to FIGS. 11 and 12. First, the light flux from the laser light source 1 is made incident on the toric lens 74 as the parallelism detection light flux 43 through the half mirror 41. In FIG. 11, the solid line indicates the main scanning light flux, and the broken line indicates the sub-scanning light flux. At this time, when the parallelism detection light beam 43 is in the parallel state, the four-division photodiode is placed at a position (circular position) where the beam diameter after passing through the toric lens 74 becomes equal between the main scanning light beam and the sub-scanning light beam. When 75 is arranged, each element part of the four-division photodiode 75 receives light equally in the parallel state as shown in FIGS. 11B and 12B.
The output of the error amplifier 76 becomes zero. On the other hand, if the parallelism detection light flux 43 is likely to converge, FIG. 11A and FIG.
As shown in (a), the main-scanning light beam side is in a flat light receiving state, and the output of the error amplifier 76 becomes -V. On the other hand, if the parallelism detection light flux 43 is diverging, FIG.
As shown in (c) and FIG. 12 (c), the sub-scanning light flux side is in a predominant flat light receiving state, and the output of the error amplifier 76 becomes + V. As described above, since the error voltage corresponding to the convergence state of the parallelism detection light beam 43 is output from the error amplifier 76, the error voltage is fed back to the piezoelectric element 31 and contracted / expanded in the optical axis direction, thereby collimator. The position of the lens 3 in the optical axis direction can be adjusted so that a parallel light flux is secured. As a result, the parallelism of the light flux can always be maintained.

By the way, the spot diameter on the photoconductor 8 can be changed by intentionally changing the image forming position, and it can be applied to change the recording density.

Reference numeral 77 is an optical cover for covering the optical box 15, and 78 is a sync detector 13 formed in the optical box 15.
It is an opening for mounting.

[0036]

According to the first aspect of the present invention, the semiconductor laser is supported in an optical scanning device provided with a laser light source including a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux. A laser support body and a lens support body that supports the collimator lens, and the laser support body and the lens support body are attached to both ends of the laser support body and are perpendicular to the optical axis of the collimator lens with respect to the outer surface of the apparatus housing. Since a lens barrel that can be attached in any direction is provided, even a collimator lens with a relatively large aperture and a long focal length can be attached without impairing the assemblability, and therefore, it is possible to use it for high-density recording. A laser light source compatible with a scanning device can be provided.

In addition, according to the second aspect of the present invention, there is provided detection means for detecting the parallelism of the light beam emitted from the laser light source and transmitted through the collimator lens, and is interposed between the lens support and the lens barrel. A piezoelectric element is provided which is expanded and contracted by the output of the detection means to monitor the parallelism of the emitted light of the semiconductor laser by the detection means, and which is interposed in the laser light source according to the detection result of the detection means. Since the expansion and contraction are controlled, even if the parallelism is deviated due to the thermal expansion of the lens barrel, the change in the oscillation wavelength of the semiconductor laser, etc., the correction can be properly performed, and the image formation position changes due to the influence of temperature. Therefore, a high-density and high-quality image can be obtained.

According to the invention described in claim 3, a laser light source comprising a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux, and a light flux from the laser light source side is deflected in the main scanning direction. A deflector having a deflecting / reflecting surface for scanning, and a line which is located near the deflecting / reflecting surface and forms a parallel light beam emitted from the laser light source into a long line image in the main scanning direction to enter the deflecting / reflecting surface. In an optical scanning device including an image forming system and a scanning lens system that converges a light beam deflected by the deflector while scanning the surface to be scanned at a uniform speed, the line image forming system is arranged in the sub-scanning direction. Since it is formed by a concave mirror having a curvature, it is not affected by changes in the refractive index of the material, etc. Therefore, even if the wavelength of the light source changes, the imaging position does not change, and therefore the high It is possible to obtain a high quality image in degrees.

According to the invention described in claim 4, a laser light source including a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux, and a light flux emitted from the laser light source in the main scanning direction. An optical scanning device including a deflector having a deflecting / reflecting surface for deflecting and scanning, and a scanning lens system for converging a deflected light beam by the deflector and performing main scanning at a uniform speed on a surface to be scanned, is provided with 90 in the sub-scanning direction. A roof-shaped reflecting means is provided which has two reflecting surfaces forming an angle and forms a folded optical path from the scanning lens system toward the surface to be scanned, and the position adjusting is such that the reflecting means is adjustable in the optical axis direction. Since the means is provided, it is possible to align the image forming light beam position on the surface to be scanned, thus canceling the dimensional error due to the processing accuracy of the device housing and the variation of the focus position of the scanning lens system. Rukoto also, and incident back and forth can reliably maintain parallelism of the beams, it is possible to obtain a high-quality image at high density.

According to the invention described in claim 5, a laser light source including a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux, and a light flux emitted from the laser light source in the main scanning direction. An optical scanning device comprising: a deflector having a deflecting / reflecting surface for deflecting and scanning; and a scanning lens system for main-scanning a surface to be scanned at a constant speed while converging a light beam deflected by the deflector. A long toroidal lens positioned between the surface to be scanned and having a shape for correcting the field curvature in the sub-scanning direction while forming an image of a deflected light beam on the surface to be scanned by cooperation with the scanning lens system. By providing the undulation adjusting means for adjusting the undulation of the long toroidal lens in the sub-scanning direction,
It is possible to cancel the influence of the inclination of the image-forming light beam, the inclination due to the attachment of the scanning lens system, and the like. Therefore, it is possible to prevent the deterioration of the image due to the bending of the main scanning line and obtain a high-density and high-quality image.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a laser light source showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a basic configuration of an optical scanning device.

3A and 3B are exploded views of the optical scanning device, in which FIG. 3A is a side view and FIG. 3B is a plan view.

FIG. 4 is a perspective view mainly showing an optical box.

FIG. 5 is a perspective view showing the vicinity of a polygon mirror.

FIG. 6 is an exploded perspective view showing the vicinity of a concave mirror.

FIG. 7 is a perspective view showing the vicinity of position adjusting means.

FIG. 8 is a vertical sectional side view mainly showing an optical path state.

FIG. 9 is an exploded perspective view showing the vicinity of a long toroidal lens.

FIG. 10 is a side view showing the vicinity of undulation adjusting means.

FIG. 11 is a plan view showing the operation of the detection means.

FIG. 12 is an explanatory diagram showing a light receiving state of a four-division photodiode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 laser light source 2 semiconductor laser 3 collimator lens 6 deflection reflection surface 7 deflector 8 scanned surface 9 scanning lens system 10 long toroidal lens 15 device housing 21 laser support 22 lens barrel 28 lens support 31 piezoelectric element 44 concave mirror = Line image forming system 51 Reflecting means 51a, 51b Reflecting surface 55 Position adjusting means 67 Rough adjusting means 72 Detection means

Claims (5)

[Claims] 1. An optical scanning device provided with a laser light source comprising a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux, wherein a laser support for supporting the semiconductor laser and the collimator lens are supported. And a lens support that is attached to both ends of the laser support and the lens support, and a lens barrel that is attachable to the outer surface of the apparatus housing in a direction perpendicular to the optical axis of the collimator lens. An optical scanning device characterized in that 2. A detection means for detecting the parallelism of the light beam emitted from the laser light source and transmitted through the collimator lens is provided, and the expansion / contraction control is provided by the output of the detection means interposed between the lens support and the lens barrel. The optical scanning device according to claim 1, further comprising a piezoelectric element. 3. A laser light source comprising a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux, and a deflection having a deflection reflection surface for deflecting and scanning the light flux from the laser light source side in a main scanning direction. A linear image forming system for forming a parallel light beam emitted from the laser light source near the deflecting / reflecting surface into a long line image in the main scanning direction and entering the linear image into the deflecting / reflecting surface; In a light scanning device having a scanning lens system for converging a light beam deflected by a mirror and performing a main scan at a constant speed on a surface to be scanned, the linear image forming system is formed by a concave mirror having a curvature in the sub-scanning direction. An optical scanning device characterized by the above. 4. A laser light source comprising a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux, and a deflecting / reflecting surface for deflecting and scanning the light flux emitted from the laser light source in a main scanning direction. In an optical scanning device including a deflector and a scanning lens system that converges a light beam deflected by the deflector and main-scans a surface to be scanned at a constant speed, two reflecting surfaces forming 90 ° in the sub-scanning direction are provided. A roof-shaped reflecting means for forming a folded optical path from the scanning lens system toward the surface to be scanned is provided, and position adjusting means for adjusting the reflecting means in the optical axis direction is provided. Optical scanning device. 5. A laser light source comprising a semiconductor laser and a collimator lens for converting a divergent light flux of the semiconductor laser into a parallel light flux, and a deflection reflection surface for deflecting and scanning the light flux emitted from the laser light source in the main scanning direction. In an optical scanning device including a deflector and a scanning lens system that converges a light beam deflected by the deflector and performs main scanning at a uniform speed on a surface to be scanned, a scanning lens system is provided between the scanning lens system and the surface to be scanned. A long toroidal lens having a shape that corrects the field curvature in the sub-scanning direction while forming a deflected light beam on the surface to be scanned by cooperation with the scanning lens system is provided. An optical scanning device comprising undulation adjusting means for adjusting the undulation in the sub-scanning direction.