JPH08136849A - Optical scanner - Google Patents

Abstract

PURPOSE: To avert the occurrence of wind whistling and to enable deflection measurement and measurement of revolving shaft position with high accuracy with an optical scanner which executes image recording while rotating a laser beam over the entire circumference of a revolving shaft. CONSTITUTION: The outer periphery of a rotating body 5 in which a pentagonal prism and a condenser lens are housed is provided with a self cut face 21 cut by rotational driving of a motor 2 for rotational scanning. The deflection of the rotating body 5 is measured on the basis of this self-cut face 21. An exit part 12 for the light beam is opened on the cut face 16 dropped by cutting at the plane approximately parallel with the revolving shaft to suppress the wind whistling in this exit part 12. Further, a part where unbalance is adjusted by installation of a weight is covered by a hood 18 and is made flush with the outer peripheral surface of the rotating body 5. The occurrence of the wind whistling is averted by the ruggedness of the unbalance adjusting part.

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, and more particularly to an optical scanning device having a structure in which a deflection beam is rotated by a motor to deflect a light beam over the entire circumference of the rotating shaft.

[0002]

2. Description of the Related Art As an optical scanning device having a structure in which a light beam is deflected over the entire circumference of a rotary shaft, there is conventionally known an optical scanning device.
Some of them are disclosed in Japanese Patent No. 158580. The optical scanning device is configured, for example, as shown in FIG. In FIG. 1, a photosensitive material 1 is formed on the inner peripheral surface of a cylindrical drum (not shown), and a motor (spindle motor) 2 is arranged coaxially with the cylindrical axis of the photosensitive material 1.
A rotary body 5 holding a pentaprism 3 as a deflection element and a condenser lens (condenser element) 4 is attached to the end of the rotation axis of the.

On the other hand, the laser light emitted from the semiconductor laser 6 is irradiated through a lens 7 as a light beam parallel to the cylindrical axis to a pentaprism 3 in the rotating body 5 and is deflected by the pentaprism 3. After being received, the light is condensed by the condenser lens 4 to form an image on the photosensitive surface of the photosensitive material 1. Here, since the rotating body 5 is rotated by the motor 2, the laser light is imaged on the photosensitive surface while rotating around the cylinder axis, and the rotation center of the laser light is in the cylinder axis direction. By moving, two-dimensional image recording is performed on the photosensitive material 1.

In FIG. 1, reference numeral 8 is a control means for controlling laser light emission by the laser light emitting means 6. As shown in FIG. 13, the rotating body 5 has an entrance 11 for opening a laser beam to irradiate the pentaprism 3 at one end in the axial direction, and the outer surface is deflected by the pentaprism 3. An emission portion 12 for emitting the laser light focused by the condenser lens 4 toward the photosensitive material 1 is opened.

[0005]

By the way, in holding a deflecting element such as the pentaprism in a rotating body, conventionally, a holding member 15 (generally a metal) different from the material of the deflecting element (see FIG. 1) is used. ), When temperature fluctuations occur with respect to the ambient temperature at the time of fixation, thermal stress is generated in the deflection element due to the difference in thermal expansion coefficient between the deflection element and the holding member, and distortion occurs in the deflection element. There was something to do.

When the deflecting element is distorted, astigmatism of the laser beam is generated, and the beam diameter deviates from a desired value, resulting in deterioration of image quality. Further, conventionally, as shown in FIG. 13, the emitting portion is opened on the outer peripheral surface of the rotating body, and the opening causes a step corresponding to the thickness of the rotating body on the outer peripheral surface.

For this reason, when the rotating body is rotated, there is a problem in that wind noise is generated at the step portion, which deteriorates the rotational speed jitter and deteriorates the image quality of the image recorded on the photosensitive material. For example, if there is a 5 mm step in the direction of rotation on a cylinder with a diameter of 70 mm, the rotation speed jitter will be about 5.
There was also the fear that the product value would deteriorate significantly due to the generation of wind noise.

Further, in the prior art, in order to adjust the unbalance of the rotating body, a hole (or a screw hole) 31 or a groove 32 is formed on the outer peripheral surface or the axial end surface of the rotating body 5 as shown in FIG. 14 or 15. ,
It is configured to balance the rotation by installing weights on these, or by shaving on the correction surface.This also causes wind cutting during rotation, like the stepped portion of the emitting portion, and the rotation speed It was supposed to worsen the jitter.

Further, in measuring the rotational shake of the rotating body, if there is distortion or fine scratches on the rotating body, it is not possible to discriminate the change due to these and the rotational shake of the rotating body, so that high measurement accuracy can be ensured. It was difficult. Similarly, when measuring the distance between the rotation axis of the rotating body and the surface of the photosensitive material, the distortion and scratches of the rotating body may deteriorate the measurement accuracy.

Further, in the case where an abnormal vibration occurs due to an increase in the unbalanced amount of the rotating body for some reason or wear of the bearing of the motor, conventionally there is no means for detecting the abnormal vibration. In addition, the recording operation is performed while the abnormal vibration is generated, and in the worst case, there is a possibility that the motor may be damaged or the like. Further, in the past, since the deflecting element such as a pentaprism and the condensing lens are separately held in the rotating body, it is difficult to mount them in parallel, and high machining accuracy is required for mounting them in parallel. However, there was a problem that the cost was high.

Further, since a holding portion is required for each of them, the cost is correspondingly increased, and the diameter of the rotating body is increased to accommodate them, and the weight of the rotating body becomes heavy. As the size increases, it becomes necessary to use a large and heavy motor. Therefore, there is a problem that the weight of the entire apparatus is increased and the apparatus cost is significantly increased.

Further, conventionally, the mounting position of the motor is manually adjusted while measuring the distance between the drum holding the photosensitive material and the rotating body, and the mounting accuracy is several μ.
In an optical scanning device that requires a high precision of m or less, there is a problem that adjustment takes a long time. The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to suppress the occurrence of thermal stress in the deflection element due to temperature fluctuations.

It is another object of the present invention to prevent deterioration of rotation speed jitter due to wind cutting. Another object of the present invention is to make it possible to measure the shake of the rotating body and the position of the rotating body with high accuracy without being affected by distortion and scratches of the rotating body. Another object of the present invention is to make it possible to detect the occurrence of abnormal vibration and to avoid leaving the abnormal vibration as it is.

It is another object of the present invention to facilitate the attachment of the deflecting element and the condenser lens housed in the rotating body and to make the rotating body compact. Further, another object of the present invention is to enable efficient adjustment of the mounting position of the motor.

[0015]

Therefore, an optical scanning device according to the invention of claim 1 holds a deflecting element in a cylindrical rotating body, and rotates the rotating body around its cylindrical axis by a motor, A light beam parallel to the rotation axis, which is incident from an incident portion opened on the axial end face of the rotating body, is deflected at a right angle by the deflecting element and is emitted from an emitting portion opened on the peripheral wall of the rotating body. In the optical scanning device configured to deflect the beam over the entire circumference of the rotation axis, the deflection element is held in the rotating body by a holding member made of the same material as the deflection element.

In the optical scanning device according to the invention of claim 2,
The emitting portion is opened on a cut surface obtained by cutting the outer periphery of the rotating body with a surface substantially parallel to the rotation axis. In the optical scanning device according to the invention of claim 3, there is provided a configuration in which imbalance adjustment of the rotating body is performed in a concave portion formed on an outer peripheral wall or an axial end surface of the rotating body, and the concave portion is formed on the rotating body. A hood that is flush with the cylindrical outer periphery is attached.

In the optical scanning device according to the invention of claim 4,
A self-cut surface formed by rotational driving by the motor is provided on the outer periphery of the rotary body, and the rotational axis position of the rotary body or the shake of the rotary body is measured with the self-cut surface as a reference. In the optical scanning device according to the invention of claim 5, an acceleration sensor is provided in the motor or a holding portion of the motor, and the acceleration sensor detects abnormal vibration.

In the optical scanning device according to the invention of claim 6,
A condensing element is provided integrally with the deflecting element. In the optical scanning device according to the invention of claim 7, the distance between the mounting reference surface of the optical scanning device and the rotation axis of the rotating body is measured, and the motor is supported in the radial direction based on the measurement result. The central axis of the rotating body is adjusted by controlling the voltage applied to the piezoelectric element.

[0019]

According to the optical scanning device of the invention of claim 1,
Since the deflection element is held by the holding member made of the same material as the deflecting element, that is, the holding member made of the material having the same coefficient of thermal expansion, it is possible to prevent thermal stress from being generated in the deflecting element. According to the optical scanning device of the second aspect of the present invention, since the outer periphery of the rotating body is cut along a plane substantially parallel to the rotation axis and the light beam emitting portion is opened on the cut surface, a step in the emitting portion is formed. It can be made sufficiently small, and since the cut surface is continuous with the outer peripheral surface of the rotating body, the occurrence of wind cutting can be avoided, and thus the rotation speed jitter can be reduced.

According to the optical scanning device of the third aspect of the present invention, the hood that is flush with the outer peripheral surface of the rotating body is attached to the recess formed for adjusting the imbalance of the rotating body. , It is possible to install a weight for the concave portion and to adjust the imbalance by adjusting the size of the concave portion, and at the time of actual optical scanning, there is no step difference that causes wind cutting in the rotating body. , Rotation speed jitter can be reduced.

According to the optical scanning device of the fourth aspect of the present invention, the rotary body is provided with a self-cut surface formed by cutting in a state of being attached to the motor, and the shake and the rotational axis position are measured with the self-cut surface as a reference. Therefore, the measurement can be performed without being affected by the distortion and the scratch of the rotating body. According to the optical scanning device of the fifth aspect of the present invention, since the motor or the holding portion of the motor is provided with the acceleration sensor, when abnormal vibration occurs due to an increase in the amount of imbalance in the rotating body or wear of the motor bearing, it is possible Abnormal vibration is detected by the acceleration sensor, and fail-safe control such as stopping the motor drive can be executed.

According to the optical scanning device of the sixth aspect of the present invention, since the deflecting element and the condensing element are integrally provided in the rotating body, the processing is facilitated and the size of the rotating body can be reduced. As a result, the entire device can be made compact. According to the optical scanning device of the invention of claim 7,
By supporting the radial direction of the motor with a piezoelectric element and adjusting the voltage applied to the piezoelectric element based on the measurement result of the distance between the reference plane and the rotating shaft of the rotating body, the axes of the motor and the rotating body are made parallel. Then, the distance is adjusted to the reference value.

[0023]

Embodiments of the present invention will be described below. The system configuration of the optical scanning device in the following embodiments is the same as that shown in FIG. 1, and the same elements are designated by the same reference numerals for the description. First, in the present embodiment, as shown in FIG. 2, the pentaprism 3 serving as a deflection element and the condenser lens (condenser element) 4 housed in the rotating body 5 are integrated in advance, and It was configured to be housed in.

According to this structure, it is possible to omit the adjustment work for mounting the exit surface of the pentaprism 3 and the condenser lens 4 in parallel to the rotating body 5 with respect to the rotating body 5. Further, it is not necessary to provide a holding mechanism for each, and it suffices to provide one mechanism for holding the one in which the penta prism 3 and the condenser lens 4 are integrated, so that the diameter of the rotating body 5 can be reduced. Therefore, the entire device can be made compact.

Here, the penta prism 3 as a single unit,
Alternatively, the pentaprism 3 having the condenser lens 4 integrated therein
The holding member 15 for holding the inside of the rotating body 5 is made of the same material as the material of the pentaprism 3, that is, the material of the same coefficient of thermal expansion, and when the pentaprism 3 is fixed to the holding member 15. Even if there is a temperature change with respect to the ambient temperature,
The pentaprism 3 can be prevented from being thermally stressed. If the generation of thermal stress in the pentaprism 3 is suppressed in this way, it is possible to avoid distortion in the pentaprism 3 and thus prevent astigmatism.

On the other hand, in this embodiment, in the rotating body 5, the emitting portion 12 is opened as shown in FIGS. 3 (A) and 3 (B). That is, instead of opening the emitting portion 12 on the outer peripheral surface of the rotating body 5, the emitting portion 12 is opened on a surface (cut surface) 16 which is cut and cut by a surface substantially parallel to the cylindrical axis of the rotating body 5. I am allowed. The cut surface 16 may be a curved surface having a sufficiently large curvature with respect to the outer diameter of the rotating body 5.

According to this structure, when the rotating body 5 is rotated around its cylindrical axis, it is possible to eliminate a step in the rotating direction of the emitting portion 12 and to suppress the occurrence of wind cuts. It is possible to prevent the deterioration of the rotation speed jitter. That is, when the emitting portion 12 is opened on the outer peripheral surface of the rotating body 5, a step corresponding to the wall thickness of the rotating body 5 is generated in the rotation direction, and wind-cutting occurs at the step portion. However, if the emitting portion 12 is opened in the cut surface 16 as shown in FIG.
From the outer peripheral surface of the cut surface 16 is continuous without a step, and,
Since the thickness of the cut surface is thin, the step generated by the emitting portion 12 can be made sufficiently small, so that the occurrence of wind cutting can be suppressed. If the generation of wind noise is suppressed, it is possible to prevent the rotation speed jitter from being deteriorated due to the wind noise, and to prevent the generation of wind noise.

By the way, if the rotating body 5 is unbalanced, vibration (vibration) will occur when it is rotationally driven, so it is necessary to adjust the unbalance. In this embodiment, as shown in FIG. 4, a reduced diameter portion 5a is formed at the axial end portion of the outer peripheral surface of the rotating body 5, and the unbalanced portions are provided on the outer periphery of the reduced diameter portion 5a at substantially equal intervals. An unbalance adjustment is performed by forming a hole (or screw hole) 17 (recessed portion) as an adjusting portion and installing a weight in the hole 17.
Then, after the unbalance adjustment, as shown in FIG. 5, by attaching a ring-shaped (may be a two-divided configuration) hood 18 that fills the step of the reduced diameter portion 5a, the outer periphery of the rotating body 5 The imbalance adjusting unit made the surface flush with each other without unevenness.

Therefore, even if the hole 17 is formed in the outer circumference of the rotating body 5 for adjusting the imbalance, the hole (or screw hole) 17 becomes an unevenness that causes wind cutting during beam scanning. Therefore, it is possible to avoid the deterioration of the rotation speed jitter and the generation of wind noise due to the wind noise. Further, as shown in FIG. 6 and FIG. 7, a recessed portion as an unbalanced adjustment portion is provided as an annular groove 19 formed on the axial end surface of the rotating body 5, and an unbalanced adjustment is made by installing a weight to the groove 19. In this case, a disk having an opening for the incident portion 11 is used as the hood 20, and the hood 20 is attached so as to cover the groove 19 after the unbalance adjustment. Eliminates unevenness on the end face. Also in this case, the outer surface of the rotating body 5 does not become uneven due to the imbalance adjusting unit, and it is possible to avoid the occurrence of wind cutting by making the surface flush.

Although a structure for adjusting the imbalance by installing a weight in the hole 17 or the groove 19 has been shown, the rotary member 5 is previously prepared.
The unbalance adjustment may be performed by scraping off the correction surface (recessed portion) set on the outer surface of the rotary body 5. Also in this case, the correction surface can be covered to be flush with the outer peripheral surface of the rotating body 5. By attaching the hood, it is possible to avoid the occurrence of wind cutting due to the imbalance adjusting unit.

By the way, if the rotating body 5 is shaken during optical scanning, the image quality is deteriorated, and the central axis of the photosensitive material 1 is adjusted by adjusting the distance between the rotating shaft of the rotating body 5 and the photosensitive material 1. It is required that the rotation axes of the rotating body 5 are correctly aligned with each other. Therefore, the shake of the rotating body 5 can be measured,
Alternatively, it is necessary to measure the distance between the rotating body 5 and the surface of the photosensitive material. However, if the rotating body 5 is distorted or scratched, the accuracy of measuring the shake and the distance will be deteriorated.

In view of this, in the present embodiment, the rotating body 5 is attached to the motor 2 and is rotated, and a bit is applied to the outer peripheral surface of the rotating body 5. Band-shaped cutting surface (hereinafter referred to as self-cut surface)
21 is formed, and the shake and the rotational axis position are measured with the self-cut surface 21 as a reference. For example, when the shake (surface shake) of the rotating body 5 is measured, as shown in FIG. 9, when the probe 22 of the micro displacement gauge is brought into contact with the self-cutting surface 21 and the rotating body 5 is rotated. Measure the runout of the. According to this configuration, even if the rotating body 5 is distorted or has small scratches, the reference for measurement is based on the self-cut surface 21 that is not affected by the distortion or scratches, so that highly accurate measurement is possible. Becomes

Even when the position of the rotary shaft of the rotary body 5 is measured, if the distance from the self-cutting surface 21 to the formation position of the photosensitive material 1 is measured, a high measurement accuracy can be secured. The accuracy of adjusting the position of the rotary shaft can be increased.
Here, in the work of measuring the rotational axis position of the rotating body 5 and adjusting the mounting position of the rotating body 5 (motor 2) as described above, adjustment accuracy of several μm or less is required.
Manual adjustment requires a long time.

Therefore, in this embodiment, the adjustment work is performed by the configuration shown in FIG. FIG.
22 is a holding member for the motor 2 and is formed so as to surround the motor 2. The holding member 22 is connected to the motor 2 via a biasing member 23 and a piezoelectric element 24 (piezoelectric element). Holds in non-contact.

The urging member 23a urges the motor 2 in a downward direction in the figure passing through the rotating shaft. The piezo element is located at a position facing the urging member 23a across the rotating shaft. 24 a supports the motor 2. Similarly, the biasing member 23b and the piezo element 24b are
The biasing member 23b is arranged so as to have a positional relationship at right angles to the radial direction connecting the 23a and the piezo element 24a.
Urges the motor 2 to the right in the figure.

Here, the piezo elements 24a and 24b are configured to extend in the radial direction of the motor 2 according to the applied voltage, and when a voltage is applied to the piezo elements 24a and 24b,
The position of the motor 2 is moved in the radial direction against the biasing force of the biasing members 23a and 23b. As the urging member 23, rubber, coil spring, leaf spring, or the like can be used.

On the other hand, a drum on which the self-cutting surface 21 of the rotating body 5 and the photosensitive material 1 are formed by the inner diameter measuring device 25.
The distance between the inner surface (mounting reference surface) of 26 is measured as corresponding to the distance between the rotation axis and the drum surface 26, and the operator can store the memory of the measuring device 25. In the case shown in FIG. 10, the voltage applied to the piezo element 24a is adjusted to adjust the position in the vertical direction of the motor 2 (rotating shaft) depending on whether or not the distance read by the target value matches the target value. So that the distance matches the target value. Similarly, when adjusting the position of the motor 2 (rotating shaft) in the left-right direction in the figure, the voltage applied to the piezo element 24b is adjusted.

According to this structure, the piezoelectric elements 24a, 24a
Since the position of the motor 2 (rotating shaft) can be finely adjusted by the voltage applied to b, it is possible to perform highly accurate position adjustment in a short time as compared with the case where the motor position is manually moved. The applied voltage of the piezo element 24 can be automatically adjusted based on the output of the inner diameter measuring device 25.

By the way, when the weight installed in the imbalance adjustment is disengaged and the imbalance amount is increased or the bearing of the motor 2 is worn, abnormal vibration occurs and the image quality is deteriorated. , There is a fear that the rotating body 5 will blow away. Therefore, as shown in FIG. 11 or 12, an acceleration sensor 27 is attached to the holding member 22 of the motor 2 or the motor 2 itself, and when abnormal vibration is detected by the acceleration sensor 27 during operation, the motor is immediately turned on. It is recommended to perform a fail-safe such as stopping and warning the user.

If the acceleration sensor 27 is attached, the unbalanced adjustment of the rotating body 5 can be performed on an actual machine. Generally, when the holding method of the motor changes, the shake of the rotating body 5 changes, so if the unbalance adjustment can be performed on an actual machine, the unbalance adjustment can be performed with high accuracy.
Although the optical scanning device is configured to include only one light source (semiconductor laser), it may be configured to include a plurality of light sources and simultaneously record a plurality of lines.

Further, it is clear that the deflecting element is not limited to the structure using the penta prism, and a right angle prism or the like may be used as the deflecting element.

[0042]

As described above, according to the optical scanning device of the first aspect of the present invention, it is possible to prevent the deflection element from being thermally stressed even if the ambient temperature changes.
There is an effect that the beam diameter can be set to a desired value by avoiding the generation of astigmatism in the deflecting element.

According to the optical scanning device of the second aspect of the present invention, it is possible to avoid the occurrence of a step in the rotation direction at the light beam emitting portion, and thus to prevent the deterioration of the rotation speed jitter and the generation of the wind noise due to the wind noise. The effect is that you can do it.
According to the optical scanning device of the third aspect of the present invention, the hood is attached so as to cover the concave portion for adjusting the unbalance of the rotating body so as to be flush with the outer peripheral surface of the rotating body. Thus, it is possible to prevent the deterioration of the rotation speed jitter and the generation of wind noise.

According to the optical scanning device of the fourth aspect of the present invention, by providing the rotating body with the self-cutting surface, the measurement of the surface deviation and the measurement of the rotational axis position are not affected by the distortion and the scratch of the rotating body. The effect is that it can be performed with high accuracy. According to the optical scanning device of the fifth aspect of the present invention, it is possible to detect the occurrence of abnormal vibration and execute fail-safe, and thus it is possible to reliably avoid the worst situation such as the motor being destroyed. There is.

According to the optical scanning device of the sixth aspect of the present invention, since the deflecting element and the condensing element are integrally provided in the rotating body, processing is facilitated and the size of the rotating body can be reduced. Therefore, there is an effect that the entire apparatus can be made compact. According to the optical scanning device of the seventh aspect, the position of the rotary shaft can be adjusted by adjusting the voltage applied to the piezoelectric element, so that there is an effect that highly accurate position adjustment can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an optical scanning device according to the present invention.

FIG. 2 is a diagram showing a deflecting element and a condenser lens according to an embodiment.

FIG. 3 is a diagram showing an emission part in the embodiment, (A)
Is a front perspective view, and (B) is a side view.

FIG. 4 is an exploded perspective view showing an imbalance adjusting unit in the embodiment.

FIG. 5 is a perspective view showing how the hood is attached in the embodiment.

FIG. 6 is an exploded perspective view showing an imbalance adjusting unit in the embodiment.

FIG. 7 is a perspective view showing how the hood is attached in the embodiment.

FIG. 8 is a side view showing a self-cut surface in the example.

FIG. 9 is a perspective view showing a state of blur measurement using a self-cut surface in an example.

FIG. 10 is a front view showing a configuration for adjusting the rotational axis position in the embodiment.

FIG. 11 is a perspective view showing an embodiment including an acceleration sensor.

FIG. 12 is a perspective view showing an embodiment including an acceleration sensor.

FIG. 13 is a perspective view showing a conventional rotating body.

FIG. 14 is a perspective view showing a conventional imbalance adjusting unit.

FIG. 15 is a perspective view showing a conventional unbalance adjusting unit. 1
Photosensitive material 2 Motor 3 Penta prism (deflecting element) 4 Condensing lens (condensing element) 5 Rotating body 11 Incident part 12 Emitting part 15 Holding member 16 Cut surface 17 Hole 18, 20 Hood 19 Groove 21 Self-cut surface 23 Energizing Member 24 Piezo element (Piezoelectric element) 25 Inner diameter measuring device 26 Drum 27 Accelerometer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03G 15/04 21/00 502 H04N 1/19

Claims (7)

[Claims] 1. Rotation in which a deflecting element is held in a cylindrical rotating body, and the rotating body is rotated around its cylindrical axis by a motor, and is incident from an incident portion opened at an axial end surface of the rotating body. In an optical scanning device having a configuration in which a light beam parallel to an axis is deflected at a right angle by the deflecting element and emitted from an emission part opened in a peripheral wall of the rotating body, and the light beam is deflected over the entire circumference of the rotation axis. An optical scanning device, wherein the deflection element is held in the rotating body by a holding member made of the same material as the deflection element. 2. A rotation which holds a deflection element in a cylindrical rotating body, rotates the rotating body around its cylindrical axis by a motor, and is incident from an incident portion opened on an axial end face of the rotating body. In an optical scanning device having a configuration in which a light beam parallel to an axis is deflected at a right angle by the deflecting element and emitted from an emission part opened in a peripheral wall of the rotating body, and the light beam is deflected over the entire circumference of the rotation axis. The optical scanning device is characterized in that the emitting portion is opened in a cut surface obtained by cutting the outer periphery of the rotating body with a surface substantially parallel to the rotation axis. 3. A rotating member which holds a deflecting element in a cylindrical rotating body, rotates the rotating body around its cylindrical axis by a motor, and is incident from an incident portion opened on an axial end face of the rotating body. In an optical scanning device having a configuration in which a light beam parallel to an axis is deflected at a right angle by the deflecting element and emitted from an emission part opened in a peripheral wall of the rotating body, and the light beam is deflected over the entire circumference of the rotation axis. And a hood having a concave portion formed on an outer peripheral wall or an axial end surface of the rotating body for adjusting the unbalance of the rotating body, wherein a hood having the concave portion flush with the cylindrical outer periphery of the rotating body is attached. An optical scanning device characterized in that 4. A rotation which holds a deflection element in a cylindrical rotating body, rotates the rotating body around its cylindrical axis by a motor, and is made incident from an incident portion opened at an axial end face of the rotating body. In an optical scanning device having a configuration in which a light beam parallel to an axis is deflected at a right angle by the deflecting element and emitted from an emission part opened in a peripheral wall of the rotating body, and the light beam is deflected over the entire circumference of the rotation axis. A self-cut surface formed by rotational driving by the motor is provided on the outer circumference of the rotating body, and the rotational axis position of the rotating body or the shake of the rotating body is measured with the self-cut surface as a reference. Optical scanning device. 5. A rotation, in which a deflection element is held in a cylindrical rotating body, the rotating body is rotated around its cylindrical axis by a motor, and is incident from an incident portion opened on an axial end face of the rotating body. In an optical scanning device having a configuration in which a light beam parallel to an axis is deflected at a right angle by the deflecting element and emitted from an emission part opened in a peripheral wall of the rotating body, and the light beam is deflected over the entire circumference of the rotation axis. An optical scanning device, wherein an acceleration sensor is provided in the motor or a holding portion of the motor, and abnormal vibration is detected by the acceleration sensor. 6. Rotation in which a deflecting element is held in a cylindrical rotating body, and the rotating body is rotated around its cylindrical axis by a motor so that light is incident from an incident portion opened on an axial end face of the rotating body. In an optical scanning device having a configuration in which a light beam parallel to an axis is deflected at a right angle by the deflecting element and emitted from an emission part opened in a peripheral wall of the rotating body, and the light beam is deflected over the entire circumference of the rotation axis. An optical scanning device characterized in that a condensing element is provided integrally with the deflecting element. 7. A rotation which holds a deflection element in a cylindrical rotating body, rotates the rotating body around its cylindrical axis by a motor, and is made incident from an incident portion opened at an axial end face of the rotating body. In an optical scanning device having a configuration in which a light beam parallel to an axis is deflected at a right angle by the deflecting element and emitted from an emission part opened in a peripheral wall of the rotating body, and the light beam is deflected over the entire circumference of the rotation axis. The distance between the mounting reference surface of the optical scanning device and the rotation axis of the rotating body is measured, and the rotating body is controlled by controlling the voltage applied to the piezoelectric element that supports the motor in the radial direction based on the measurement result. An optical scanning device characterized by adjusting the central axis of the.