JP2000249953A - Laser scanner and receiving base for fixing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the inclination of a scanning line without impairing original optical performance even through the size of an optical box is large. SOLUTION: Fixing parts 10a to 10d are provided projectingly in the vicinity of the four corners of the optical box 10, and are fixed to a main body structure body 12 by a tapping screw 13. A wedge spacer 14 capable of adjusting height from an attaching bearing surface 12d is slidably provided along the surface 12d on the part 10d, the part 10d is fixed to the surface 12d through the spacer 14, and the remaining another parts 10a to 10c are directly fixed to the surfaces 12a to 12c of the body 12 by the screw 13. When the spacer 14 is moved in a (y) direction, the height of the part 10d from the surface 12d is changed to deform the box 10, so that the inclination of the scanning line can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser scanning device used for a laser printer, a digital copying machine, a facsimile machine, and the like. The present invention relates to a laser scanning device which is relatively long and is suitable for a case where an imaging element is elongated.

[0002]

2. Description of the Related Art Many laser scanners used in laser printers, digital copying machines, facsimile machines and the like are unitized in consideration of exchangeability and ease of maintenance. In mounting such a laser scanning device to the image forming apparatus main body, for example, it is common that a fixing portion provided in the laser scanning device is fixed to a mounting seat surface formed on a receiving stand, for example, with screws. .

[0003] Such a laser scanning device is manufactured so that predetermined performance can be obtained in a unit state by performing necessary adjustments by itself, but even after the laser scanning device is incorporated in an image forming apparatus main body. In order to maintain the same performance continuously, it is necessary to increase the component accuracy of both the laser scanning device and the image forming apparatus main body. For this reason, in some cases, the precision of parts is difficult to manufacture, and even if the precision of parts is obtained, the manufacturing cost may be extremely high.

In such a laser scanning device, it is particularly important to keep the positional relationship between the main scanning direction of the laser scanning device and the sub-scanning direction of the image forming section of the image forming apparatus main body at a right angle. Therefore, in many cases, the work of adjusting the inclination of the scanning line of the scan performed by the laser scanning device is performed with the laser scanning device attached. Hereinafter, a conventional mechanism capable of adjusting the inclination of the scanning line will be described.

For example, in an apparatus described in Japanese Patent Application Laid-Open No. 5-119276, screws for adjusting the height of the seating surface (adjusting feet) are provided at two of three fixed portions each having a mounting hole formed in the optical box. ) Are provided so that the height of the seating surface of the optical box can be adjusted by the screws. Also, in the device described in JP-A-8-11348,
A wedge-shaped plate is formed between the optical box (optical unit) and the apparatus main body, and the plate, the optical box, and the plate and the apparatus main body are mounted on respective planes. , Each of which is rotatable about each reference pin, so that a minute angle around the angle θ can be adjusted.

[0006]

However, the apparatus described in Japanese Patent Application Laid-Open No. 5-119276 has three fixing portions for fixing the optical box to the mounting plate, and reduces the distortion when fixing the optical box. By minimizing the size, the positional relationship between the various optical components in the optical box formed in a unit shape is prevented from being out of order. However, this sometimes causes a problem.

In other words, when the optical box is heavy due to the large number of various optical components disposed therein, the fixing of the optical box at only three places causes the optical box to bend or cause external vibration. In some cases, sufficient strength may not be obtained. Therefore, in such a case, the optical box needs to be made of aluminum die cast in order to increase the rigidity, so that there is a problem that the product weight increases and the cost becomes high. .

In the above-described apparatus, the adjusting screw is used for the mechanism for adjusting the height of the seating surface of the optical box. However, the screw can be repeatedly and stably adjusted in such a portion so that it can be stably and easily performed. When an adjusting screw is used, the screw is usually a metal screw, which is insert-molded into a resin material. However, in such a case, the metal screw may become an obstacle when recycling the resin, which has been activated in recent years. However, if the metal screw was manually separated from the resin material each time, it would be very time-consuming, resulting in poor efficiency.

On the other hand, in the case of the device described in Japanese Patent Application Laid-Open No. H8-11348, since the optical box is mounted on a flat surface, a large optical box is fixed by three or more fixing portions. Even though the optical box constituting the optical unit can be attached without distortion, it is necessary to form the plate slightly larger than the optical box and finish it to the high precision required as an adjusting member Therefore, there is a problem that the cost becomes high and the weight becomes heavy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and even if an optical box containing optical components is large, the original optical performance can be maintained with the optical box attached to the apparatus body. It is an object of the present invention to provide a laser scanning device that can adjust the inclination of a scanning line without impairing the scanning and that is not adversely affected by external vibration.

[0011]

In order to achieve the above object, the present invention provides a laser emitting means for emitting a laser beam, a laser beam deflecting means using a rotating polygon mirror, and a laser beam emitting means for emitting a laser beam. First optical means for forming an image on the laser beam deflecting means, and second optical means for forming an image of the laser beam deflected by the laser beam deflecting means on a predetermined image plane are provided at predetermined positions in the optical box. A laser scanning device that holds and fixes the laser beam operating unit, and fixes the optical box to the receiving table,
The configuration is as follows.

That is, the laser scanning device is configured such that the optical box is fixed to the receiving table at four or more fixing portions,
At one position of the fixing portion, there is provided fixing portion height adjusting means for adjusting the height of the fixing portion from the mounting seat surface of the pedestal, and the fixing portion height adjusting means is provided through the fixing portion height adjusting means. The fixing portion is fixed to the pedestal, and the other remaining fixing portions are each directly fixed to the pedestal.

Preferably, the fixing portion height adjusting means is a wedge-shaped spacer member, and the spacer member is slidable along a guide surface formed on either the optical box or the receiving table. In addition, the optical box is divided into upper and lower two-layered rooms, and the upper and lower rooms penetrate by an opening formed substantially in the center thereof, and the laser emitting means and the laser are arranged so as to straddle the opening in one of the rooms. When the beam deflecting means is provided and the first optical means is provided, the fixed part height adjusting means is provided on the fixed part close to the laser beam deflecting means so that the height of the fixed part can be adjusted. Good. Further, the optical box and the spacer member may be formed of the same material as the receiving table.

Further, the fixing portions are provided at substantially four corners of the optical box, and the optical box is provided with a groove or a ridge in a predetermined range for engaging with the ridge or groove formed on the receiving table. The fixed part provided with the fixed part height adjusting means is adjusted to the maximum height position within the adjustment range by adjusting the fixed part height adjusting means so that the fixed part is the highest from the mounting seat surface of the receiving stand. It is preferable that the fixing portion is located at a position where the concave groove or the ridge on the optical box side continues to wrap with the ridge or the concave groove on the receiving table side at a certain position. The pedestal for fixing each of the laser scanning devices may be made of thermoplastic synthetic resin.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an optical box of a laser scanning apparatus according to an embodiment of the present invention, a receiving stand for mounting the optical box, and a spacer interposed therebetween, and FIG. 2 is also provided in the optical box. FIG. 3 is a longitudinal sectional view showing a state in which the laser scanning device is fixed to a receiving table.

In this laser scanning device, as shown in FIG. 2, a semiconductor laser and an aperture for shaping a beam by performing a predetermined adjustment of a collimator lens for converting divergent light of the semiconductor laser into parallel light are fixed to a holter. Laser unit 1 is provided. This laser unit 1
Functions as a laser emitting means for emitting a laser beam.

This laser scanning device comprises a polygon scanner 3 which is a laser beam deflecting means having a polygonal mirror 3a which is a rotary polygon mirror, and a polygon scanner 3 which outputs parallel light of a laser beam emitted by the laser unit 1. Also, a cylindrical lens 2 as first optical means for forming an image parallel and linearly on the deflection surface is provided.

Further, an fθ mirror 4 as second optical means for forming a laser beam deflected by the polygon scanner 3 on a predetermined image plane and scanning at a constant speed is provided. Then, the laser beam reflected by the fθ mirror 4 enters the synchronization detection plate 5. The synchronization detection plate 5 includes a sensor for receiving a laser beam and generating a pulse-like signal as a synchronization detection signal, and a signal processing circuit.

A folding mirror 6 is provided between the polygon scanner 3 and the long fθ mirror 4, and the laser beam is irradiated by the folding mirror 6 through the long imaging lens 7 and the dustproof glass 8. 9 surface. The imaging lens 7 corrects the inclination of the mirror surface of the polygon scanner 3. In addition, dustproof glass 8
Is dust-proof glass that closes the optical path opening 10e formed in the optical box 10 as shown in FIG. And
A laser beam scanning unit is configured by holding and fixing each of the above-described optical components (optical elements) at predetermined positions in the optical box 10.

As described above, in a scanning optical system that uses many long optical components such as the fθ mirror 4, the imaging lens 7, and the dust-proof glass 8, the optical path of the reflected beam is reduced in order to reduce the size of the entire unit. Has an optical layout configuration in which the optical components are stacked with a slight angle difference from the horizontal optical axis, and the arrangement of the optical components becomes three-dimensional. That is, as shown in FIG. 3, since the fθ mirror 4, the imaging lens 7, and the dust-proof glass 8 are partially laminated, the optical box 10 is divided into upper and lower two-layered rooms and formed substantially in the center. The upper and lower rooms penetrate through the opened opening 11.

In this laser scanning apparatus, a laser unit 1 (FIG. 1) and a polygon scanner 3 are arranged so as to straddle an opening 11 in a room above the same, and a cylindrical lens 2 (FIG. 2) and the like are arranged. ing. Therefore, since the optical box 10 has the large opening 11 that is transverse to the main scanning direction, the optical box 10 tends to have a shape with low torsional rigidity.

The optical box 10 is made of glass fiber reinforced polycarbonate (PC) or polyphenylene oxide (PPHO) in order to increase the torsional rigidity as much as possible.
X (trade name: Noryl). Then, by fixing the portion of the optical box 10 to the main body structure 12 which is a receiving base by screwing with a tapping screw 13, the laser scanning device is connected to the main body structure 12.
To fix it. In the main body structure 12, ribs 16 of ridges are arranged in a U-shape in a range as shown in FIG. 1 and formed at a predetermined height, and the optical box 10 is formed corresponding to the ribs 16. A concave groove 17 as shown in FIG. 3 is formed in a predetermined range.

Hereinafter, the main body structure 1 of the laser scanning device will be described.
2 will be described. The optical box 10 has a polygonal scanner 3 inside, as shown in FIG.
Each of the optical components such as the fθ mirror 4, the reflection mirror 6, the imaging lens 7, and the dustproof glass 8 is formed in a size to hold and fix it at a predetermined position. In addition, since the fixing method of each of these optical components is not directly related to the present invention,
Detailed description is omitted.

The optical box 10 has a shape in which the top surface is entirely open, and the entire opening is covered with a cover 15. Then, as shown in FIG. 1, near the four corners,
Flange-shaped fixing portions 10a to 1 protruding from the respective side portions
Od (may be formed in five or more places) is formed, and each of the parts is fixed to the main body structure 12. Then, a spacer 14 is provided as a fixing portion height adjusting means for adjusting the height of the one fixing portion 10d from the mounting seat surface 12d of the main body structure 12, and the fixing portion 10d is provided via the spacer 14. To the body structure 12
Other fixing portions 10a to 1
0c are the mounting seat surfaces 12a to 12 of the main body structure 12, respectively.
c is directly fixed by a tapping screw 13.

The spacer 14 is attached to the main body structure 12.
It is formed in a wedge shape slidable along a mounting seat surface 12d serving as a guide surface formed to be inclined with respect to the upper surface 12e. A long hole 14a is formed in the spacer 14 along the longitudinal direction, and the tapping screw 13 inserted into the screw hole of the fixing portion 10d is passed through the long hole 14a.
The tapping screw 13 is attached to the mounting seat surface 1 of the main body structure 12.
The fixing portion 10d of the optical box 10 is screwed into a screw hole 18 formed in 2d so that the fixing portion 10d of the optical box 10 is attached to the mounting seat surface 1 of the main body structure 12.
2d is fixed via a spacer 14.

In this embodiment, the position where the optical box 10 is fixed to the main body structure 12 is defined by fixing portions 10a to 10d.
And three of the fixing portions 10a to 10c are directly fixed to the main body structure 12 by tapping screws 13 (the height cannot be adjusted). The number may be four or more to improve the vibration resistance of the laser scanning device. However, even in that case, one of the mounting seat surfaces on the main body structure 12 side needs to be configured to fix the optical box 10 to the main body structure 12 via the spacer 14 as described above.

As described above, when the number of mounting seat surfaces on the main body structure 12 side is increased, the position of the increased mounting seat surface is
It is necessary to set the position so as not to impair the effect of the spacer 14. Since the shape of the optical box is different from the position where the mounting seat surface is increased, it is preferable to experimentally determine the position. In particular, when resonance occurs by chance, at that time, only slightly shifting the natural frequency, without necessarily changing the static rigidity greatly, only by increasing the number of mounting seat surfaces, The situation may be visibly improved.

The main body structure 12 and the spacer 14 are preferably formed of the same material as the optical box 10, for example, a synthetic resin.
Then, the main body structure 12, the spacer 14, and the optical box 1 are formed.
A value of 0 has the same thermal expansion coefficient. Therefore, even if the temperature inside the device in which the laser scanning device is provided rises, distortion due to thermal deformation accompanying the temperature change is less likely to occur.

The main body structure 12 for fixing the laser scanning device is preferably made of a thermoplastic synthetic resin. By doing so, the nut for fixing the screw to the body structure 12 is not insert-molded,
Can be directly screwed into and fixed to the mounting seat surfaces 12a to 12d of the main body structure 12, respectively. Therefore, when the main body structure 12 is recycled, it is necessary to remove insert-molded nuts each time. Since there is no recycling, efficient recycling is possible.

In the laser scanning device shown in FIG. 1, the optical box 10 is moved when the spacer 14 is moved along the y-direction with the spacer 14 being set on the mounting seat surface 12d serving as the inclined guide surface of the main body structure 12. It moves in the z direction (vertical direction) in accordance with the amount of movement of the spacer 14 around the fixed part 10d. At this time, the relationship between the amount of movement of the spacer 14 in the y direction and the amount of movement of the fixed portion 10d of the optical box 10 in the z direction is as follows.
It is determined by the wedge angle θ of the spacer 14, and by changing the wedge angle θ, the adjustment sensitivity for changing the position of the optical box 10 in the height direction can be freely selected.

For example, if θ = 5.7 degrees, the adjustment sensitivity becomes 1/10, so that the desired adjustment amount is, for example, ± 0.5.
mm, the amount of movement in the y direction is ± 5 mm
Becomes The wedge-shaped spacer 14
There is no problem in terms of precision when the is manufactured by molding resin.

By the way, the spacer 14 which performs the adjusting function
Is moved in the y direction of FIG.
The portion of the fixed portion 10d of 0 is displaced in the z direction (vertical direction). Therefore, the position of each optical component contained in the optical box 10 is shifted, so that the scanning line is inclined. Then, the degree of inclination of the scanning line is determined by the fixed portions 10a to 10a.
It depends on where the spacer 14 is provided in d.

FIG. 4 shows that the spacers 14 are sequentially attached to the fixing portions 10a to 10d in order (each is provided only at one place). At this time, the spacers 14 are moved in the y direction in FIG. 9 shows experimental data obtained by measuring the change in the inclination of the scanning line when the height of the portions 10a to 10d is changed. In this experiment, the inclination of the scanning line when the height of the spacer 14 is 0 mm (the state in which the fixing portions 10a to 10d are not lifted by the spacer 14) is set to 0. The sign of the inclination of the scanning line is such that the scanning line inclined in the z + direction in the y + direction is (+) plus the inclination.

The results of the experiment, as apparent from FIG.
When the spacer 14 is provided at any of the fixed portions 10a to 10d, the inclination of the scanning line changes when the position of each fixed portion is increased, but the inclination of the scanning line with respect to the amount of change in the height of the fixed portion. Varies in each case. However, the correlation between the amount of change in the height of the fixed portion due to the spacer 14 and the amount of change in the inclination of the scanning line is very good, and can be said to be a linear change. This indicates that this degree of deformation is minute deformation for the optical box 10.

The relationship between the amount of change in the height of the optical box fixing portion and the inclination of the scanning line is represented by f stored in the optical box 10.
It depends on the arrangement of each optical component such as the θ mirror 4, the imaging lens 7, the dustproof glass 8, etc., and the rigidity of the optical box 10 itself. That is, as is apparent from FIG. 2, the optical components such as the fθ mirror 4, the imaging lens 7, and the dustproof glass 8 have a long shape as in this laser scanning device, and the optical box 10 is relatively When the box is large and the torsional rigidity of the box itself is weak due to the opening 11 in the center thereof, local deformation by the spacer 14 does not reach far from the position where the spacer 14 operates.

Therefore, the deformation of the optical box 10 by the spacer 14 is a simple twist deformation, and the optical box 1 is deformed.
The optical components located in the vicinity of the long side of 0 are deformed to be inclined to each other. Therefore, the inclination of the scanning line and the deterioration of the aberration in this case are modeled as rotational eccentricity of the optical component (optical element) around the optical axis, and it is easy to make geometrical optical prediction.

The laser scanning device according to this embodiment is
From the experimental results shown in FIG. 4, it was determined that the spacer 14 was provided on the mounting seat surface 12 d of the main body structure 12.
Thus, when the spacer 14 is provided on the mounting seat surface 12d, the position of the fixing portion 10d of the optical box 10 in the height direction changes by adjusting the position of the spacer 14, so that
As a result, the polygon scanner 3 rotates around the optical axis, and scans the imaging lens 7 with a predetermined angle of light. As a result, the scanning line is tilted on the image plane.

As shown in FIG. 3, the polygon scanner 3 and the imaging lens 7 are separately disposed on the left and right sides of the optical box 10 with an opening 11 therebetween.
Since the polygon scanner 3 and the imaging lens 7 are integrated with the side wall surface and have relatively rigidity, the deformation of the fixed portion 10d by the spacer 14 is not It is considered that each mounting surface of the image lens 7 is hardly affected.

Considering how much the degree of inclination of the scanning line differs depending on the mounting seat surface on which the spacer 14 is provided, as shown in FIG. 4, for example, when the spacer 14 is provided on the mounting seat surface 12c (marked by x). ), The adjustment sensitivity (the degree of inclination of the scanning line with respect to the adjustment amount of the spacer 14) becomes less noticeable than when it is provided on the mounting seat surface 12d (diagram indicated by △). Therefore, as apparent from FIG. 4, it is preferable to provide the spacer 14 on the mounting seat surface 12d because the best adjustment sensitivity can be obtained. In FIG. 4, the line marked with a circle indicates the case where the spacer 14 is provided on the mounting seat surface 12a, and the line marked with a square indicates that the spacer 14 is mounted on the mounting seat surface 1a.
2b.

As described above, the adjustment sensitivity varies depending on the size and shape of the optical box 10 and the shapes and arrangement positions of various optical components housed therein. Spacer 14 at position 12d
Is not the most preferable.

However, in this laser scanning device, as described above, the rib 16 of the ridge is formed at a predetermined height in a U-shape in the range as shown in FIG. Since the concave groove 17 as shown in FIG. 3 is formed in a predetermined range on the optical box 10 side corresponding to 16, it is preferable to provide the spacer 14 at the position of the mounting seat surface 12 d.

That is, in this laser scanning device, dust in the optical box 10 is reduced by the concave groove 17 and the rib 1 on the main body structure 12 side.
6 and the mounting seat surface 12
If the spacer 14 is provided at the position c and the portion of the mounting seat surface 12c is moved up and down, the gap around the dustproof glass 8 changes. Therefore, dust or dirt or the like intrudes into the optical box 10 through the gaps as it is. To prevent such a situation, it is necessary to devise a layout, or a portion holding the dust-proof glass 8 has an elastic member or the like. Since it is necessary to provide a sealing member,
The structure becomes troublesome and the cost increases.

On the other hand, if the spacer 14 is provided at the position of the mounting seat surface 12d, even when the spacer 14 is adjusted to the maximum adjustment position where the fixing portion 10d is the highest from the mounting seat surface 12d, the rib 16 is recessed. If the dimensional relationship is maintained so that the dust-proof glass 8 is kept wrapped in the groove 17, dust-proof properties can be obtained without providing an elastic member or a seal member in a portion for holding the dust-proof glass 8.

The guide surface on which the spacer 14 slides may be provided on the optical box 10 side. Further, the rib 16 may be provided on the optical box 10 side, and the concave groove 17 may be provided on the main body structure 12 side.

[0045]

As described above, according to the present invention, the following effects can be obtained. According to the laser scanning device of the first aspect, the inclination of the scanning line can be easily adjusted to a desired inclination without impairing the original optical performance by deforming the optical box by the fixed portion height adjusting means. it can. Therefore, the inclination of the scanning line can be adjusted without using expensive parts or increasing the weight of the product. Also, there is no adverse effect on external vibration.

According to the laser scanning device of the second aspect, since the fixing portion height adjusting means is a wedge-shaped spacer member, fine adjustment can be performed even with relatively rough dimensional accuracy.

According to the laser scanning device of the third aspect, the entire device can be downsized by an optical layout in which the optical paths of the reflected beams are stacked with a slight angle difference from the horizontal optical axis. In addition, the opening formed substantially at the center prevents local deformation of the optical box by the fixed part height adjusting means from affecting the position far from the position where the fixed part height adjusting means operates. Therefore, it is possible to easily adjust the inclination of the scanning line. Since the fixed portion of the optical box on the side close to the laser beam deflecting means is adjusted in height by the fixed portion height adjusting means, the adjustment does not change the height of the laser emitting means side. Become like

According to the laser scanning device of the fourth aspect, since the optical box and the spacer member are formed of the same material as the main body structure, they all have the same coefficient of thermal expansion. Even if the internal temperature of the installed apparatus rises, distortion due to thermal deformation accompanying the temperature change is less likely to occur.

According to the laser scanning device of the present invention, dust in the optical box is protected by wrapping the ridge and the groove.
Even if the amount of wrap between the ridge and the groove changes due to the adjustment of the fixing portion height adjusting means, the dustproofness of the optical box can be maintained. Therefore, it is not necessary to provide a special dust-proof seal or the like, so that the configuration can be simplified and the device can be manufactured at low cost.

According to the pedestal for fixing the laser scanning device of the sixth aspect, since it is formed of a thermoplastic synthetic resin, the tapping screw is not inserted into the pedestal without inserting a nut. Since the pedestal can be screwed and fixed directly to the pedestal, it is not necessary to remove the insert-molded nuts when recycling the pedestal. Therefore, efficient recycling is possible.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an optical box of a laser scanning device according to an embodiment of the present invention, a receiving stand for mounting the optical box, and a spacer interposed therebetween.

FIG. 2 is a perspective view showing each optical component constituting a scanning optical system provided in the optical box.

FIG. 3 is a longitudinal sectional view showing a state where the laser scanning device is fixed to a receiving table.

FIG. 4 is a diagram showing a relationship between a change in height of each fixed portion and a change in the amount of inclination of a scanning line when spacers are sequentially attached to four fixed portions provided in four places in the optical box of FIG. 1; is there.

[Explanation of symbols]

 1: laser unit (laser emitting means) 2: cylindrical lens (first optical means) 3: polygon scanner (laser beam deflecting means) 4: fθ mirror (second optical means) 9: photosensitive drum 10: optical box 10a to 10d: fixing portion 11: opening 12: main body structure (receiving stand) 12a to 12d: mounting seat surface 14: spacer (fixing portion height adjusting means) 16: rib (protrusion) 17: concave groove

Claims (6)

[Claims] 1. A laser emitting means for emitting a laser beam, a laser beam deflecting means using a rotating polygon mirror, and a first optical device for forming an image of the laser beam emitted by the laser emitting means on the laser beam deflecting means. Means and a second optical means for forming a laser beam deflected by the laser beam deflecting means on a predetermined image plane are respectively held and fixed at predetermined positions in an optical box to constitute a laser beam operation unit. A laser scanning device configured to fix the optical box to a receiving table, wherein the optical box is fixed to the receiving table by four or more fixing portions, and the fixing portion is fixed to one of the fixing portions. A fixing portion height adjusting means for adjusting the height of the receiving stand from the mounting seat surface is provided, and the one fixed portion is fixed to the receiving stand via the fixing portion height adjusting means, and the remaining The fixed part of it Is the laser scanning apparatus is characterized in that so as to directly fixed to the cradle. 2. The fixing portion height adjusting means is a wedge-shaped spacer member, and the spacer member is slidable along a guide surface formed on either the optical box or the receiving table. The laser scanning device according to claim 1, wherein: 3. The optical box is formed so as to be divided into upper and lower two-layered rooms, and an opening formed substantially in the center penetrates the upper and lower rooms so that one side of the room straddles the opening. The laser emitting means and the laser beam deflecting means are provided, and the first optical means is provided. The fixing part height adjusting means is attached to the fixing part on the side close to the laser beam deflecting means. The laser scanning device according to claim 1, wherein the laser scanning device is provided so as to be adjustable. 4. The laser scanning device according to claim 2, wherein the optical box and the spacer member are formed of the same material as the pedestal. 5. The fixing portion is provided at approximately four corners of the optical box, and the optical box has a groove or a protrusion which engages with a protrusion or a groove formed on the receiving table. The fixed part provided in the range of the above and provided with the fixed part height adjusting means, the fixed part height adjusting means is adjusted to the maximum height position within the adjustment range, and the fixed part is The fixing portion at a position where the concave groove or the ridge on the optical box side keeps wrapping with the ridge or the concave groove on the receiving table side when it is located at the highest position from the mounting seat surface. 1 to 4
The laser scanning device according to claim 1. 6. A pedestal for fixing the laser scanning device according to claim 1, wherein the pedestal is made of a thermoplastic synthetic resin.