JPH09126229A - Dynamic pressure bearing, light deflection device and recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To start a dynamic bearing smoothly when it starts rotating by setting one of the respective contact surfaces of a rotor with a radial bearing and the rotor with a thrust bearing to a smooth surface of surface roughness less than specified and the other contact surface to a rough surface of surface roughness of more than specified. SOLUTION: A rotor 107 is provided rotatably so as to have a little gap between a guide surface 106 on the outer circumference of a cylinder of a radial bearing 105 and an opposing surface 108 formed on the inner circumference of a rotor 107. Opposing surfaces 110, 111 formed on the upper part and lower part of the rotor 107, a guide surface 112 of a lower thrust bearing 103 and a guide surface 113 of an upper thrust bearing 109 are respectively provided to include gaps between them. One of the respective contact surfaces of the rotor 107 with the radial bearing 105 and the rotor 107 with the thrust bearings 103, 109 is made a smooth surface of surface roughness of less than Ra0.3 and the other contact surface made a rough surface of surface roughness of Ra0.3 or more. Thus cost for machining a dynamic bearing can be lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a dynamic pressure generating groove in one or both of a stationary body that constitutes a bearing and a rotating body facing the stationary body, and the dynamic pressure is generated by the rotation of the rotating body. A dynamic pressure bearing for a rotary machine that enables a high-speed rotation of the rotating body by forming a gap between the rotating body and a stationary body by the action of the groove for use, especially a dynamic pressure bearing that smoothes the rotation start of the rotating body. It is about.

[0002]

2. Description of the Related Art For example, in order to rotate a polygon mirror, which is an optical deflector used in an image forming apparatus, at high speed, the polygon mirror is attached to a shaft through a ball bearing provided in a high speed motor, and the polygon mirror is mounted on the shaft. It was rotating at high speed. The support by the ball bearings ensures reliable starting, but there is a limit to the number of rotations. In an image forming apparatus, especially a printer, in order to obtain high speed and high image quality, it is necessary to further increase the number of rotations, so that a dynamic pressure bearing capable of rotating a rotating body in an air gap is used. became. Generally, to install a rotating body using a dynamic pressure bearing, an air gap is formed to rotate the rotating body at a high speed.
It is basically installed horizontally. Further, in the dynamic pressure bearing, as described above, the wind generated by the high speed rotation of the rotating body is introduced into the dynamic pressure generating groove provided in the stationary body, and the wind generates a wind stronger than the dynamic pressure generating groove. Is applied to the surface of the rotating body to form an air gap of several μm unit between the surface of the stationary body and the surface of the rotating body, and the resistance between the non-rotating body and the rotating body is reduced to enable high-speed rotation of the rotating body. There is. A polygon mirror is known as a structure in which the above dynamic pressure bearing is used in an image forming apparatus (Japanese Utility Model Publication Nos. 4-38330 and 5-16574).

[0003]

As described above, when the polygon mirror supported by the dynamic pressure bearing is started and rotated, for example, the switch of the image forming apparatus is turned "on" and the power is input to the image forming apparatus. At the same time, power is also input to the plurality of stator coils. However, when the hydrodynamic bearing is stopped, the air gap is not formed by the weight of the rotating body and the polygon mirror, and the thrust bearing installed on the lower side and the lower surface of the rotating body are in contact with each other. When starting the rotation by the starting force of the plurality of stator coils and the magnet of the rotating body, the weight of the rotating body and the polygon mirror causes resistance on the bearing surface, which makes it difficult to start the rotation. Further, for example, after dew condensation occurs between the rotating parts of the dynamic pressure bearing due to cooling of the outside air, water droplets may be dried and become stuck between the rotating parts. Furthermore, if the rotor and the thrust bearing surface have low roughness, that is, they are formed in a state close to a mirror surface, a ringing action (adhesion phenomenon) works, and it becomes more difficult to start. In an extreme case, even if the switch of the image forming apparatus is turned “on”, the polygon mirror does not start and the image forming operation cannot be started.

The present invention has been conceived in particular in order to eliminate the above problems. That is, the object of the present invention is to configure the bearing of the polygon mirror used as the light deflecting device with a dynamic pressure bearing and to smoothly start the rotation of the dynamic pressure bearing.

[0005]

For the above-mentioned purpose, the present invention provides a radial bearing, a thrust bearing provided at at least one end of the radial bearing, and a periphery of the radial bearing around the radial bearing. In a dynamic pressure bearing having a rotating body rotatably provided, contact surfaces of the rotating body and the radial bearing and between the rotating body and the thrust bearing, one of which has a surface roughness of less than Ra 0.3. Smooth surface of
On the other hand, a rough surface having a surface roughness of Ra 0.3 or more,
3. The rotating body according to claim 2, further comprising a radial bearing, a thrust bearing provided at at least one end of the radial bearing, and a rotating body rotatably provided around the radial bearing around the radial bearing. Each of the contact surfaces of the radial bearing and the rotating body and the thrust bearing has a contact surface of Ra.
A dynamic pressure bearing having a smooth surface with a surface roughness of less than 0.3 and the other with a surface roughness of Ra 0.3 or more, a polygonal mirror and a magnet integrally provided on the rotating body, and the magnet. 4. A polygonal mirror comprising a stator coil provided to face each other, and exciting the stator coil to rotate a polygonal mirror integrally provided on the rotating body. At least the radial bearing and the radial bearing according to claim 3. A thrust bearing provided at one end, and a rotating body provided around the radial bearing so as to be rotatable around the radial bearing. Contact portions of the rotating body and the radial bearing, and the contacting portions of the rotating body and the thrust bearing. A surface of one of which is a smooth surface with a surface roughness of less than Ra 0.3, and the other of which has a surface roughness of Ra 0.3 or more;
Light for rotating a polygonal mirror integrally provided on the rotating body by exciting the stator coil by a polygonal mirror and a magnet integrally provided on the rotating body and a stator coil provided so as to face the magnet. A deflecting device and irradiating a photoconductor with a light beam scanned by the optical deflecting device. In claim 4, the optical deflecting device comprises an optical deflecting device drive circuit, a semiconductor laser light emitting body, and a laser emitting light. This is achieved by including a control circuit, a laser shaping optical system, an fθ lens, a cylindrical lens, a synchronous detector, and a laser light reflecting mirror.

[0006]

1 is a perspective view showing an embodiment of a beam light scanning optical system unit 1 using a dynamic pressure bearing of the present invention and using a polygon mirror.

In the figure, 100 is a mounting base,
1A is a semiconductor laser light emitter, and the semiconductor laser light emitter 1
A laser control board A incorporating a laser emission control circuit is connected to A. 2 is a collimator lens (beam shaping optical system), 5 is a first cylindrical lens, 116
Is a polygon mirror, 7 is an fθ lens, 8 is a second cylindrical lens, 9 is a reflection mirror, and 10 is a photosensitive drum. Reference numeral 11 is a mirror for timing detection, 12 is a synchronization detector, and an index control board C is connected to the synchronization detector 12. Reference numeral 13 is a drive motor for the polygon mirror 116.
Is a drive motor control board B which is a light deflection device drive circuit.
Are connected, and the drive motor 116 is rotating accurately.
The beam emitted from the semiconductor laser light emitting body 1A is collimated by the collimator lens 2. The beam enters the polygon mirror 116 through the first cylindrical lens 5 of the first image forming optical system. The reflected light passes through the second imaging optical system including the fθ lens 7 and the second cylindrical lens 8 and passes through the reflection mirror 9 on the surface of the photosensitive drum 10 with a predetermined spot diameter in the sub-scanning direction. To scan. The main scanning direction has already been finely adjusted by an adjusting mechanism (not shown).

In the synchronization detection for each line, the light beam before the start of scanning is made incident on the synchronization detector 12 via the mirror 11.

FIG. 2 shows a first embodiment of the dynamic pressure bearing. 10
Reference numeral 1 is a cross-sectional view showing the entire structure of a dynamic pressure bearing, showing an apparatus used for a polygon mirror rotating at a high speed. The base 100
One end of a core shaft 102 for supporting and fixing the dynamic pressure bearing 101 is vertically fixed on the upper side. In the method of assembling the dynamic pressure bearing 101, first, a plate-shaped lower thrust bearing 103 is fixedly provided on the core shaft 102. Next, the radial bearing 105 is penetrated and fixed to the core shaft 102. The lower thrust bearing 103 and the radial bearing 105 may be integrally formed and fixed at the same time. Next, the radial bearing 10
The rotating body 107 is rotatably provided so that there is a slight gap (1 to 7 μm) between the guide surface 106 on the outer circumference of the cylinder and the facing surface 108 formed on the inner circumference of the rotating body 107. Next, the upper thrust bearing 109 is fixed by penetrating the core shaft 102. At this time, the facing surfaces 110 and 111 formed on the upper and lower portions of the rotating body 107 and the lower thrust bearing 103
Guide surface 112 of the upper thrust bearing 109
It is also provided so as to have a gap similar to the above between each of them. Next, on the outer periphery of the rotating body 107, a supporting portion 114 formed separately is integrally fixed, and a polygon mirror 116 having a large number of reflecting surfaces 115 is fixed by a fixing member 117 to the supporting portion 114. (The rotor and the support 114 may be integrated). After the assembly is completed in order as described above, the holding seat plate 118 is fixed to the core shaft 1 with the screw 119.
It is fixed to the other end of 02 and the assembly is completed.

The guide surface 1 of the lower thrust bearing 103
A dynamic pressure generating groove 121 is formed only on the groove 12.

As the structure of the drive motor 13 shown in FIG. 1, a stator coil 124 is provided on the base 100 via an insulating member 123, and a stator coil 124 is provided below the support portion 114 of the rotating body 107 in the rotating direction. A magnet 125 facing the stator coil 124 is provided, and by energizing the stator coil 124, the drive motor 13 of the polygon mirror 116 for inductively rotating the rotating body 107 at high speed is configured. By the rotation of the drive motor 13, the dynamic pressure action of the dynamic pressure generating groove 121 causes
An air gap is formed between the facing surfaces 110 of the rotating body to enable smooth high speed rotation. The dynamic pressure bearing 101 is configured as described above and is rotationally driven.

In this embodiment, when the rotating body 107 is stopped, the facing surface 110 of the rotating body 107 and the guide surface 112 of the lower thrust bearing 103 are in contact with each other, and the rotating body 1
07 starts rotating around the radial bearing 105, and the dynamic pressure generating groove 121 formed in the guide surface 112 forms an air gap between the guide surface 112 and the facing surface 110, enabling high speed rotation. And That is, when stopped, the facing surface 110 of the rotating body 107 and the guide surface 112 of the lower thrust bearing 103 are in contact with each other by the weight of the rotating body 107, and the air gap is formed as described above when the rotation starts. .

FIG. 3 and FIG. 4 are enlarged views of a part of the dynamic pressure bearing 101, in which the surface roughness of each contact portion is enlarged.

FIG. 3 shows the guide surface 112 of the lower thrust bearing 103 and the guide surface 113 of the upper thrust bearing 109.
The guide surface 106 formed on the radial bearing 105 is a smooth surface, and the facing surfaces 11A, 11B and 11C formed on the rotating body 107 provided so as to have an air gap between the guide surfaces 112, 113 and 106 are rough surfaces. Here is an example.

FIG. 4 shows a guide surface 10C of the lower thrust bearing 103, a guide surface 10A of the upper thrust bearing 109, and
The guide surface 10B formed on the radial bearing 105 is roughened, and the facing surfaces 108, 110, 111 of the rotating body 107, which are provided so as to have an air gap between the roughened guide surfaces 10A, 10B, 10C, An example of a smooth surface is shown.

As described above, according to the present invention, as shown in FIG. 3 and FIG. 4, the starting characteristics of the dynamic pressure bearing 101 can be made good by making the surface roughness of the opposing surfaces different from each other. . In the embodiment shown in FIG. 4, the guide surface 10C of the lower thrust bearing 103, the guide surface 10A of the upper thrust bearing 109, the guide surface 10B of the radial bearing 105,
In the embodiment of FIG. 3, the facing surface 11 of the rotating body 107
It is not necessary to make all the surfaces of A, 11B and 11C rough surfaces, but at least the lower part, preferably only the guide surface 10C of the lower thrust bearing 103 is made rough, or the guide surface 10C of the lower thrust bearing 103 is made rough. And radial bearing 105
Only the guide surface 10B may be roughened.

In the above embodiment, the dynamic pressure generating groove 12 provided in the lower thrust bearing 103 when the rotating body 107 rotates.
Due to the dynamic pressure action of No. 1, an air gap is generated between the rotating body 107 and the lower thrust bearing 121, and the rotating body 107 is slightly lifted to enable smooth rotation, but the upper thrust bearing 109 is also provided on the upper portion. Therefore, a slight air gap is generated between the upper thrust bearing 109 and the rotating body 107. Therefore, the rotating body 107 can smoothly rotate around the radial bearing 105 without floating above the surface facing the lower thrust bearing 103 by a predetermined gap or more.

FIG. 5 shows a second embodiment of the present invention in which a part of the dynamic pressure bearing 101 is enlarged. (The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.) As shown, in this embodiment, the guide surface 112 formed on the lower thrust bearing 103 and the radial bearing 105 are formed. Guide surface 10
6 is provided, and a member 118 for preventing the rotating body 107 from coming off is provided on the upper portion, and the core shaft 102 is fixed with a screw 119 as in FIG.
To the other end of. The guide surface 112, the contact surface 118A between the guide surface 106 and the rotating body 107 of the slip-out preventing member 118 is a smooth surface, and the facing surfaces 11A, 11B, 11C of the rotating body 107 are rough surfaces. The same effect as that of the first embodiment can be obtained.

As described above, in the second embodiment, the rotating body 10
During rotation of No. 7, an air gap is generated between the rotating body 107 and the lower thrust bearing 121 due to the dynamic pressure action by the dynamic pressure generating groove 121 formed in the lower thrust bearing 103. Is not provided, the rotating body 107 rotates only by the guide of the radial bearing 105 when the rotating body 107 rotates, and the resistance of the slip-off preventing member 118 is extremely small, so that smooth rotation can be performed.

The lower thrust bearing 10 composed of the dynamic pressure bearing 101 in the first and second embodiments explained above.
3, the upper thrust bearing 109, and the radial bearing 10
5, the slip-out preventing member 118, and the material of the rotating body 107 are formed of either metal or preferably ceramic. Further, it can be formed of resin.

The ceramic is resistant to abrasion and galling generated during rotation, and is also excellent in heat resistance. However, since the ceramic is porous, dew condensation occurs especially in cold weather, and when the dew condensation dries, stains may occur on the dew condensation surface, and the stain portion may inhibit rotation. The problem was solved by making the surface roughness Ra of the rotating body 107 and, in particular, the guide surface 112 formed on the lower thrust bearing 103 different.

FIG. 6 shows the relationship between the dynamic pressure generating groove 121 and the rough guide surface 10C of the lower thrust bearing 103. In FIG. 4, the bottom of the dynamic pressure generating groove 121 formed on the rough guide surface 10C of the lower thrust bearing 103 and the bottom of the rough surface formed on the rough guide surface 10C. A good dynamic pressure effect is obtained by setting the interval to 3 to 10 μm.

In the first and second embodiments,
Although the dynamic pressure generating groove is provided only in the lower thrust bearing 103, it is formed in the radial bearing 105 and the lower thrust bearing 103, or in the radial bearing 105 and the lower thrust bearing 103 and the upper thrust bearing 109 (in this case, only the first embodiment). May be.

As described above, by making the guide surface and the facing surface of the dynamic pressure bearing 101 have the above-mentioned surface roughness, it is possible to reduce the ringing effect and to start smoothly.

Next, the guide surface 112 of the lower thrust bearing 103 of the dynamic pressure bearing of the first embodiment shown in FIG.
The guide surface 113 of the upper thrust bearing 109, the surface roughness A of the cylindrical guide surface 106 of the radial bearing 105, and the rotating body 10
Table 1 shows the surface roughness B of the facing surfaces 110, 111, and 108 of No. 7.
Table 1 shows the results of the start-up characteristics when the above-mentioned combinations and start-up experiments were performed.

Start-up characteristics 1 Start-up test of the optical deflector equipped with a dynamic pressure bearing in a normal environment.

Start-up characteristics 2 Left for 1 hour in an environment of -5 ° C,
After returning to the normal environment and allowing condensation to form on the bearing, a startup test was performed after 4 hours of natural drying.

The start condition is evaluated by applying a limiter of 1.5 A to the start current.

[0029]

[Table 1]

In Table 1 above, the steady rotation speed (20,000 rpm) is reached within 5 seconds.

○ Within 7 seconds, the steady-state rotation speed (20,000
rpm) is reached.

Δ It takes 10 seconds or more to reach a steady rotation speed.

No rotation or steady rotation is not reached.

As described above, the guide surface 112 of the lower thrust bearing 103, the guide surface 113 of the upper thrust bearing 109,
In the combination of the rough guide surface 10A, the surface roughness A of the smooth surface of the guide surface 106 of the radial bearing 105, and the surface roughness B of the rough surfaces of the facing surfaces 11A, 11B, 11C of the rotating body 107. When the surface roughness A of the smooth surface is Ra 0.3 or less (preferably Ra 0.2 or less), the surface roughness B of the rough surface is Ra when the environment is harsh as shown in Table 1.
It has been found that 0.3 to 3 (preferably Ra 0.4 to 2.5, more preferably 0.5 or more and 2.0 or less) is particularly good. It was also found that the difference in Ra is preferably 0.1 to 2.8 (preferably 0.2 to 2.0).

When the surface roughness B of the rough surface is Ra 3.0 or more, the generation of dynamic pressure becomes insufficient and the starting characteristics deteriorate.

When the surface roughness A of the smooth surface is Ra 0.3 or more, the friction between the bearings becomes large and the starting characteristics deteriorate.

The above results are obtained when the second embodiment is carried out, or when the surface roughness 1 and the surface roughness 2 in Table 1 are interchanged, and further, the guide surface 10 of the lower thrust bearing 103.
When only C is a rough surface and the facing surface 112 of the rotating body 107 is a smooth surface, the guide surface 10C of the lower thrust bearing 103 and the guide surface 10B of the radial bearing 105 are rough surfaces, and the facing surface against them is a smooth surface. The same effect was obtained in the case.

The surface roughness Ra is determined according to JIS B06.
It is the center line average roughness (Ra) defined by 1-182, and was measured here using a surfuda SE-30H (manufactured by Kosaka Laboratory).

[0039]

According to the first aspect of the present invention, there is provided a dynamic bearing having a radial bearing, a thrust bearing provided at at least one end of the radial bearing, and a rotating body rotatably provided around the radial bearing. In the pressure bearing, contact surfaces of the rotating body and the radial bearing, and contact surfaces of the rotating body and the thrust bearing, one is a smooth surface having a surface roughness of less than Ra 0.3, and the other is a surface of Ra 0.3 or more. Since the surface is rough, it can be started smoothly even if dew condensation occurs on the facing surface of the rotor due to environmental changes due to temperature and humidity. Further, it has become possible to reduce the processing cost of the dynamic pressure bearing.

According to a second aspect of the present invention, a radial bearing and a thrust bearing provided at least at one end of the radial bearing,
A rotating body that is rotatably provided around the radial bearing as a center, and a contact surface of each of the rotating body and the radial bearing, the rotating body and the thrust bearing,
One is a smooth surface with a surface roughness of less than Ra 0.3, and the other is Ra.
The stator coil comprises a dynamic pressure bearing having a surface roughness of 0.3 or more, a polygonal mirror and a magnet integrally provided on the rotating body, and a stator coil provided so as to face the magnet. Since the polygon mirror provided integrally with the rotating body is rotated by exciting the rotating body, when the polygon mirror is used in an optical deflecting device provided with the dynamic pressure bearing, the environmental change due to temperature and humidity is particularly high. Even if dew condensation occurs on the facing surface of the rotating body,
It is possible to smoothly start the rotation of the rotating body by the stator coil provided so as to face the magnet. It was also possible to reduce the starting current.

According to a third aspect of the present invention, a radial bearing and a thrust bearing provided on at least one end of the radial bearing,
A rotary body provided around the radial bearing so as to be rotatable around the radial bearing, and the surface roughness of each contact portion of the rotary body and the radial bearing, or the rotary body and the thrust bearing, A dynamic pressure bearing having a surface roughness of less than Ra 0.3 and a surface roughness of Ra 0.3 or more, a polygonal mirror and a magnet integrally provided on the rotating body, and the magnet. An optical deflecting device, which comprises a stator coil provided facing each other, and rotates a polygon mirror integrally provided on the rotating body by exciting the stator coil, and a light beam scanned by the optical deflecting device as a photoconductor. Since the optical deflecting device provided with the dynamic pressure bearing for the rotation of the polygon mirror is built into the recording device, there is a change in the environment due to temperature and humidity at the place where the recording device is installed, Even if dew condensation occurs on the opposite surface, Since the rotation of the rotating body can be smoothly started by the stator coil provided in the opposite direction, the starting current is reduced, and even when the external signal is input to the recording device even when the environment changes, the optical deflection is immediately performed. When the device reaches a predetermined number of revolutions, the photosensitive member is irradiated with laser light accurately and smoothly, and a good image can be obtained when used in a recording device.

According to a fourth aspect of the present invention, the optical deflector comprises an optical deflector drive circuit, a semiconductor laser light emitter, a laser emission control circuit, a laser shaping optical system, and an fθ lens.
Since it consists of a cylindrical lens, a synchronous detector, and a laser light reflection mirror, when an external signal is input to the recording device, the optical deflector immediately reaches a predetermined number of rotations and a good image can be obtained. At the same time, it is possible to irradiate the photosensitive member with laser light accurately and smoothly and obtain a good image when used in a recording apparatus.

[Brief description of the drawings]

FIG. 1 is a perspective view of a light beam scanning optical system provided with an optical deflecting device using a dynamic pressure bearing of the present invention.

FIG. 2 is a sectional view showing an optical deflecting device using a dynamic pressure bearing.

FIG. 3 is an enlarged sectional view showing a dynamic pressure bearing of the present invention.

FIG. 4 is an enlarged sectional view showing another dynamic pressure bearing of the present invention.

FIG. 5 is a sectional view showing an optical deflecting device using another dynamic pressure bearing of the present invention.

FIG. 6 is an enlarged sectional view showing a thrust bearing of the dynamic pressure bearing of the present invention.

[Explanation of symbols]

1 Optical Scanning Optical Unit 116 Polygon Mirror 103 Lower Thrust Bearing 109 Upper Thrust Bearing 105 Radial Bearing 102 Core Shaft 121 Grooves for Dynamic Pressure Generation 108, 110, 111 Opposing Faces of Rotating Body 106, 112, 113 Bearing Guide Face 100 Base 11A, 11B, 11C Roughened body facing surfaces 10A, 10B, 10C Roughened radial and thrust bearing guide surfaces

Claims (4)

[Claims] 1. A dynamic pressure bearing having a radial bearing, a thrust bearing provided at at least one end of the radial bearing, and a rotating body rotatably provided around the radial bearing. The contact surface of each of the rotating body and the radial bearing, and the rotating body and the thrust bearing, one is a smooth surface having a surface roughness of less than Ra 0.3, and the other is a rough surface having a surface roughness of Ra 0.3 or more. A dynamic pressure bearing characterized in that 2. A radial bearing, a thrust bearing provided at at least one end of the radial bearing, and a rotating body provided so as to be rotatable around the radial bearing, the rotating body and the radial bearing. The contact surface of each of the bearing, the rotating body and the thrust bearing is Ra0.3
A smooth surface having a surface roughness of less than, and the other surface having a surface roughness of Ra 0.3 or more, a dynamic pressure bearing, a polygonal mirror and a magnet provided integrally with the rotating body, and facing the magnet. An optical deflecting device comprising a stator coil provided, wherein a polygon mirror provided integrally with the rotating body is rotated by exciting the stator coil. 3. A radial bearing, a thrust bearing provided at at least one end of the radial bearing, and a rotating body provided so as to be rotatable around the radial bearing, the rotating body and the radial bearing. The surface roughness of each contact portion of the bearing, the rotating body and the thrust bearing is set such that one surface roughness is a smooth surface with Ra less than 0.3 and the other surface roughness is Ra0.3 or more. A hydrodynamic bearing, a polygon mirror and a magnet that are integrally provided on the rotating body, and a stator coil that is provided so as to face the magnet, and a polyhedral surface that is integrally provided on the rotating body by exciting the stator coil. An optical deflecting device that rotates a mirror and a recording device that irradiates a photoconductor with a light beam scanned by the optical deflecting device. 4. The optical deflector comprises an optical deflector drive circuit, a semiconductor laser emitter, a laser emission control circuit, a laser shaping optical system, an fθ lens, a cylindrical lens, and a synchronization detector. The recording apparatus according to claim 3, comprising a laser light reflecting mirror.