JPH11174351A - Optical operation device and optical path interval detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical operation device and optical path interval detecting device for accurately aligning a focus and an optical path. SOLUTION: Laser beams emitted by light sources 1A and 1B are reflected by collimator lenses 3A and 3B and further refracted by a half-mirror in one direction. A polygon scanner 7 makes fast scans with the laser beams. A horizontal-scanning-direction detecting element 11 has a slit 13 formed at right angles to a scanning direction. Each time two laser beams shifting in position in the scanning direction (horizontal scanning direction) pass through the slit 13, two waveform-shaped pulses are outputted from a converter. to is judged from the interval between the pulses how much the two laser beams shift in position in the scanning direction and on the basis of the deviation, a fine driving actuator 21A and a fine driving actuator 21B are driven.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical operating device and an optical path interval detecting device used for a laser beam printer or the like using a plurality of laser light sources, and more particularly to an optical operating device for accurately adjusting the focus and the optical path. And an optical path interval detecting device.

[0002]

2. Description of the Related Art Recently, the speeding up of a laser beam printer,
Higher resolution is in progress. For example, if you try to rotate the polygon mirror at high speed to increase the speed, the accuracy of the polygon mirror deteriorates, the laser light source is increased to secure the light amount, and polygon motors and circuits with strict measures against vibration and noise It was necessary to design. In addition, it has been necessary to increase the sensitivity of the photosensitive drum itself.
Therefore, recently, in order to speed up the laser beam printer without rotating the polygon mirror at high speed,
Examples of dividing the laser light source itself into a plurality are increasing. When the laser light source is divided into a plurality, it is necessary to accurately align the optical axes of each other. This is because if the positions of the optical axes are slightly different, the formed image is disturbed. As one method of aligning the optical axis, conventionally, for example, light from two laser light sources is projected on a half mirror, and the half mirror is finely adjusted using a swing motor to adjust the optical axis. Or matching. As another method, two laser light sources are fixed on the same plate and integrated. And by attaching this integrated plate to the housing of the laser scanning unit, even if the housing is deformed by temperature etc.,
The positions of the two lasers are kept unchanged.

[0003]

However, the method of finely adjusting the half mirror by using a swing motor has limitations on the accuracy of the swing motor itself and difficulties in control associated therewith. Further, the adjustment can be performed only in one direction in which the swing motor swings, and two-dimensional adjustment and focus direction adjustment cannot be performed. Further, only two optical axes can be aligned, but it is difficult to cope with a case where the number of laser light sources is plural. In addition, a tilt correction optical system is used for correction of tilt of the laser scanning unit as before, which leads to an increase in cost. On the other hand, when two laser light sources are integrated on the same plate, the resolution cannot be changed because the two laser light sources are fixed. Also, 1
Two laser light sources are fixed on one plate,
Since the positional relationship between the respective laser light sources is very difficult in terms of precision, the production yield is low. Further, conventionally, in the detection of the optical path positions of the two laser beams, the detection positions are necessarily separated into two points because dedicated optical detectors are provided independently for each of the two optical paths. Therefore, there is a possibility that the size of the apparatus is increased. The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an optical operation device and an optical path interval detecting device for accurately performing focus and optical path alignment.

[0004]

Accordingly, the present invention provides at least one light source, at least one optical lens for refracting light emitted from the light source, and images the light refracted by the optical lens. The image forming apparatus further includes an image forming surface, and a focus adjustment moving unit that minutely moves at least one of the optical lenses in a focal direction so that an image formed on the image forming surface is sharp. At least one of the optical lenses is slightly moved in the focus direction by using the focus adjusting moving means so that the image formed on the image forming plane becomes clear. The image is blurred if the optical lens is too close to or far from the image plane. The alignment in the focal direction is performed with an accuracy of several microns or less, or by coarsely moving a distance of several mm or less.

According to the present invention, in place of the focus adjustment moving means, at least one of the optical lenses is adjusted in a direction perpendicular to an optical axis to adjust an optical path of the light refracted by the optical lens. The apparatus is provided with an optical path adjusting moving means for minutely moving. The optical path of the light refracted by the optical lens may be slightly deviated from the design value due to a mismatch of the optical axis or aging. In this case, at least one of the optical lenses is slightly moved in a direction perpendicular to the optical axis by the optical path adjusting moving means. The optical path adjusting moving means can adjust the position of the optical path two-dimensionally. The position adjustment of the optical path is performed with an accuracy of several microns or less, or by coarsely moving a distance of several mm or less. This optical path adjusting moving means may be used in combination with the focus adjusting moving means described above. In this case, three-dimensional positioning can be performed.

Further, the present invention comprises an optical scanning means for scanning the light refracted by the optical lens between at least one of the optical lenses and the imaging surface.
The light is scanned by the light scanning means. In this case, the optical scanning means often causes surface tilting or processing errors, but in these cases, the optical path adjusting moving means or the focus adjusting moving means cannot adjust the focus direction or adjust the optical path. It becomes possible.

Further, according to the present invention, a plurality of the light sources are provided,
An optical axis combining means for refracting light emitted from the light source in the same direction is provided between the optical scanning means and at least one of the optical lens and the imaging surface or the optical lens. I do. There are a plurality of light sources. The optical axis combining means refracts light emitted from these light sources in the same direction. When the optical axis synthesizing means is provided, it is difficult to accurately match and hold the optical axes due to processing errors, aging, thermal expansion, and the like. Even in these cases, it is possible to adjust the position in the focus direction and the position of the optical path by the optical path adjusting moving means and the focus adjusting moving means.

Further, the present invention provides a plurality of light sources, at least one optical lens for refracting light emitted from the light source, and light for scanning light refracted by at least one of the optical lenses. Scanning means, a scanning direction optical path interval detecting element having a slit opened perpendicularly to the scanning direction of the optical scanning means for passing a part of the light scanned by the optical scanning means, and the scanning direction optical path interval detecting element And a waveform shaping unit that converts the light received by the light receiving unit into an electric signal. The present invention
This is to detect how far the optical paths of a plurality of light sources are separated or coincide with each other in the scanning direction.
At least one optical lens is provided. This optical lens may be disposed in front of the light scanning means, or may be disposed before or after the light scanning means, in addition to being disposed to face each light source in order to collect the light of each light source. May be. Part of the light scanned by the optical scanning means passes through a slit opened in a part of the scanning direction optical path interval detecting element. The slit is opened perpendicular to the scanning direction of the optical scanning means. Now, it is assumed that the optical paths of the plurality of light sources are shifted in the scanning direction. Each time the scanned light passes through the slit, the light is sensed by the light receiving unit, and an electric signal (pulse) shaped by the waveform shaping unit is generated. By detecting this pulse interval, the interval of the optical path can be determined. Since the plurality of optical paths are uniformly and simultaneously scanned by the optical scanning means, it is possible to detect the optical path intervals in the scanning direction.

Further, the present invention provides the optical scanning means for passing a part of the light scanned by the optical scanning means instead of, or together with, the scanning direction optical path spacing detecting element. And a vertical direction optical path interval detecting element having a slit opened at a predetermined inclination angle with respect to the scanning direction. The present invention uses a scanning direction optical path interval detecting element to detect how much the optical paths of a plurality of light sources aligned perpendicular to the scanning direction are separated or coincide with each other in a direction perpendicular to the scanning direction. Things. Part of the light scanned by the optical scanning means passes through a slit opened in a part of the vertical optical path interval detecting element. The slit is opened with a predetermined inclination angle with respect to the scanning direction of the optical scanning means. Now, it is assumed that the optical paths of the plurality of light sources are shifted in a direction perpendicular to the scanning direction. Each time the scanned light passes through the slit, the light is sensed by the light receiving unit, and an electric signal shaped by the waveform shaping unit is generated. Since the plurality of optical paths are uniformly and simultaneously scanned by the optical scanning means, it is possible to detect an optical path interval in a direction perpendicular to the scanning direction.

Further, according to the present invention, an optical axis combining means for refracting light emitted from the light source in the same direction is provided between at least one of the optical lenses and the optical scanning means. I do. The optical axis combining means refracts light emitted from the plurality of light sources in the same direction. The degree of inconsistency between the optical axes due to an installation error of the optical axis combining means or the like can be detected by the scanning direction optical path interval detecting element or the vertical direction optical path interval detecting element.

Further, the present invention provides at least one light source, at least one optical lens for refracting light emitted from the light source, an imaging surface for imaging the light refracted by the optical lens, and Light intensity detection means for detecting the intensity of light at or near the imaging surface; and at least one of the optical lenses so that an image formed on the imaging surface is sharp. The apparatus is provided with a focus adjusting moving means for finely moving in the focus direction based on the light intensity detected by the intensity detecting means. The light intensity detecting means detects the light intensity in the image plane or in the vicinity of the image plane. Then, based on the intensity of the light detected by the light intensity detecting means, at least one of the optical lenses is moved in the focus direction by the focus adjusting moving means so that the image formed on the image forming surface becomes clear. Move slightly. The image is blurred if the optical lens is too close to or far from the image plane. The positioning in the focus direction is controlled in units of several microns or less while feeding back the light intensity detected by the light intensity detecting means. Coarse movement alignment of several mm or less is also possible. As a result, a clear image can always be projected on the imaging surface.

Further, the present invention provides a plurality of light sources, at least one optical lens for refracting light emitted from the light sources, and a device for transmitting light refracted by at least one of the optical lenses in the same direction. Optical axis combining means for refracting, optical scanning means for scanning the light refracted by the optical axis combining means, an imaging surface for imaging the light scanned by the optical scanning means, and scanning by the optical scanning means A scanning direction optical path interval detecting element having a slit opened perpendicularly to the scanning direction of the optical scanning means in order to allow a part of the light to pass therethrough; A waveform shaping unit that converts light received by the light receiving unit into an electric signal; and a light shaping unit that adjusts an optical path of light refracted by the optical lens based on the electric signal converted by the waveform shaping unit. At least one of the light Includes an optical path adjusting moving means for fine movement in a direction perpendicular to the scanning direction optical path interval detecting element and the light receiving unit is characterized in that disposed in the vicinity of the image plane.

There are a plurality of light sources. An optical lens refracts light emitted from the light source. This optical lens may be disposed in front of the light scanning means, or may be disposed before or after the light scanning means, in addition to being disposed to face each light source in order to collect the light of each light source. May be. The optical axis combining means refracts light refracted by at least one of the optical lenses in the same direction. The light scanning means scans the light refracted by the optical axis combining means. Part of the light scanned by the optical scanning means passes through a slit opened in a part of the scanning direction optical path interval detecting element. The slit is opened perpendicular to the scanning direction of the optical scanning means. Each time the scanned light passes through the slit, the light is sensed by the light receiving unit, and an electric signal shaped by the waveform shaping unit is generated. Multiple light paths are
Since the scanning is performed uniformly and simultaneously by the optical scanning means, it is possible to detect the optical path interval in the scanning direction. The optical path interval signal obtained by the waveform shaping section is fed back to the optical path adjusting moving means. In the optical path adjusting moving means, at least one of the optical lenses is controlled in units of several microns or less in a direction perpendicular to the optical axis. Coarse movement alignment of several mm or less is also possible. The reason why at least one of the optical lenses is used is that the optical lens facing the light source may be the control target, or another optical lens disposed along the optical path may be the control target. Thus, the optical paths in the scanning direction of the plurality of light sources can be matched. Also,
Even when a plurality of light sources are to be separated at equal intervals, highly accurate positioning can be performed. Therefore, even with a plurality of light sources, it is possible to provide a high-precision and clear image as if it were an image from one light source.

Further, the present invention provides the optical scanning means for passing a part of the light scanned by the optical scanning means instead of or together with the scanning direction optical path spacing detecting element. A vertical optical path interval detecting element having a slit opened with a predetermined inclination angle with respect to the scanning direction, and the vertical optical path interval detecting element and the light receiving section are arranged in the vicinity of the imaging plane. Features.
A vertical optical path interval detecting element detects an optical path interval in a direction perpendicular to the scanning direction by the optical scanning means. And
This optical path interval signal is fed back to the optical path adjusting moving means. Thereby, the optical paths in the vertical direction of the plurality of light sources can be matched.

The focus adjusting moving means and the optical path adjusting moving means of the present invention can be constituted by a stepping motor or a linear motor. However, the present invention provides the focus adjusting moving means and / or the optical path adjusting moving means. As the means, an ultrasonic motor can be used. By using an ultrasonic motor,
Simplification, miniaturization, power saving, and cost reduction of the device can be realized. Also, since the required voltage is several volts to several tens of volts,
The power supply itself can be downsized.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. The embodiment of the present invention shows an example of application to a laser beam printer. FIG. 1 shows an overall configuration diagram of an embodiment of the present invention. In FIG. 1, the light sources 1A and 1B are, for example, laser diodes. Laser beams from the light sources 1A and 1B are focused by the collimator lenses 3A and 3B. The half mirror 5 receives the laser beams in two directions from the collimator lenses 3A and 3B and combines them in one direction. The half mirror 5 corresponds to an optical axis combining unit. The polygon scanner 7 is rotated at a high speed, and scans the laser light by sequentially reflecting the laser light from the half mirror 5 by a plurality of mirror surfaces. The polygon scanner 7 corresponds to an optical scanning unit.
lens 9 focuses the laser light from the polygon scanner 7 and forms an image on an imaging surface (photosensitive drum) (not shown). Collimator lenses 3A, 3B,
lens 9 and a cylindrical lens omitted for simplicity (the cylindrical lens is usually a polygon scanner 7).
Are provided at the front and rear stages of the optical system). The main scanning direction detecting element 11 is disposed in the vicinity of the photosensitive drum or at a position corresponding thereto, and a photodiode 27 (not shown) is fixed immediately behind the photosensitive drum.
The main scanning direction detecting element 11 has a slit 13 opened in a direction perpendicular to the scanning direction by the polygon scanner 7. On the other hand, the sub-scanning direction detecting element 15 is also disposed in the vicinity of the photosensitive drum or at a corresponding position, and a photodiode 29 (not shown) is fixed immediately behind the photosensitive drum. The sub-scanning direction detecting element 15 includes a polygon scanner 7
The slit 17 is opened so as to have a predetermined inclination angle with respect to the scanning direction. The main scanning direction detecting element 11
The sub-scanning direction detecting element 15 corresponds to a vertical direction optical path interval detecting element.

FIG. 2 shows a light intensity detecting section. FIG.
As shown in the figure, a slit 33 is opened in the light intensity detecting element 31. As the light intensity detecting element 31, the same element having the main scanning direction detecting element 11 or the sub-scanning direction detecting element 15 is used. A photodiode 35 is fixed to the back of the photodiode 35 to detect the intensity of the laser beam.
The light intensity detecting element 31 is also provided near the side of the photosensitive drum. The signal detected by the photodiode 35 is input to the control unit 37, and is calculated so that the amount of received light is maximized. The micro drive actuators 25A and 25B are controlled based on the calculation result. Light intensity detecting element 31 and photodiode 35
Corresponds to light intensity detecting means. Main scanning direction detecting element 1
1 and the sub-scanning direction detecting element 15 are, as shown in FIG.
Although set to OP and END, two may be mounted side by side on TOP.

Further, a minute drive actuator 21A is fixed to the collimator lens 3A so as to slightly move the collimator lens 3A in the X-axis direction. Similarly, a micro-drive actuator 23A for finely moving the collimator lens 3A in the Y-axis direction and a micro-drive actuator 25A for micro-movement in the Z-axis direction are fixed to the collimator lens 3A. On the other hand, a minute drive actuator 21B is fixed to the collimator lens 3B to minutely move the collimator lens 3B in the X-axis direction. Similarly, in order to move the collimator lens 3B minutely in the Y-axis direction, a minute drive actuator 23B
However, a minute drive actuator 25B is fixed to the collimator lens 3B for minute movement in the Z-axis direction. The signals detected by the photodiodes 27 and 29 are input to the control unit 37. Based on the calculation result, an output signal is output from the control unit 37 so that the two optical paths coincide or are separated at equal intervals. Then, the minute drive actuator 21A or the minute drive actuator 21
B is such that the minute drive actuator 23A or minute drive actuator 23B minutely moves the collimator lens 3A or 3B in the Y-axis direction. Micro drive actuator 21A, 21
B, 23A and 23B correspond to moving means for adjusting the optical path. In addition, the minute drive actuators 21A, 21B, 2
Each of 3A, 23B, 25A, and 25B is composed of, for example, an ultrasonic motor.

Next, the operation will be described. In FIG. 1, two light sources 1A and 1B are provided. Laser beams emitted from the light sources 1A and 1B are focused by the collimator lenses 3A and 3B. The laser beams that have passed through the collimator lenses 3A and 3B are input to the half mirror 5, where they are combined and then refracted in one direction. The multiplexed laser light enters the polygon scanner 7 and is reflected by the mirror surface of the polygon scanner 7. The polygon scanner 7 is rotating at high speed.
The laser light reflected by the polygon scanner 7 is fθ
The light is input to the lens 9 and focused. Then, the light is focused on the photosensitive drum. Note that, instead of the half mirror 5, a polarizing beam splitter may be used in addition to a glass plate and a prism. If the wavelengths of the laser beams of the light sources 1A and 1B are different, a band-pass mirror can be used.
When using R, G, and B light, a dichroic mirror may be used.

A part of the laser beam focused by the fθ lens 9 passes through the slit 13 of the main scanning direction detecting element 11 and the slit 17 of the sub-scanning direction detecting element 15. The laser light that has passed through the photodiode 27 and the photodiode 2
The light is received at 9 and is subjected to optical / electrical conversion by a converter (not shown), followed by waveform shaping. FIG. 3A shows a polygon scanner 7.
2 shows a case where two laser beams displaced in the scanning direction (main scanning direction) pass through the slit 13. At this time, 2
Each time this laser beam passes through the slit 13, two pulses whose waveforms are shaped are output from the converter. On the other hand, FIG.
FIG. 3B shows a case where two laser beams coincident with each other in the scanning direction pass through the slit 13. At this time, when two laser beams pass through the slit 13, only one pulse whose waveform is shaped is output from the converter. That is, if the interval between the detected pulses is wide, it can be confirmed that the two laser beams are separated in the scanning direction, and if the pulses overlap, the two laser beams are scanned. It can be seen that the directions match.

Next, FIG. 4A shows a polygon scanner 7.
2 shows a case where two laser beams that are displaced in a direction perpendicular to the scanning direction (sub-scanning direction) pass through the slit 17. At this time, each time two laser beams pass through the slit 17, two pulses whose waveforms are shaped are output from the converter. On the other hand, FIG. 4B shows a case where two laser beams that match in a direction perpendicular to the scanning direction pass through the slit 17. At this time, the two laser beams
After passing through 7, only one pulse whose waveform is shaped is output from the converter. That is, if the interval between the detected pulses is wide, it can be confirmed that the two laser beams are separated from each other in the vertical direction as viewed from the scanning direction, and if the pulses overlap, the two laser beams are two. It can be seen that the laser light coincides with the direction perpendicular to the scanning direction.

The output signal from the converter is input to the control unit 37. In the control section 37, for example, PID control is performed so that the pulses overlap one another. When the output signal is the displacement in the X-axis direction detected by the main scanning direction detecting element 11, the micro drive actuator 21A or the micro drive actuator 21B is driven. When the output signal is a displacement in the Y-axis direction detected by the sub-scanning direction detecting element 15, the micro drive actuator 23A or the micro drive actuator 23B is driven. Driven micro-drive actuators 21A, 21B, 23A and 23B
Moves minutely in units of several microns or less. Incidentally, the ultrasonic motor used in fine driving actuator, the piezoelectric material, a piezoelectric ceramic such as PZT, a piezoelectric crystal such as lithium crystal or tantalate, may be used a piezoelectric organic materials such as PVF _2.

As described above, the two optical paths correspond to the X-axis direction and the Y-axis direction.
The control can be performed so that they coincide with each other in the axial direction. However,
It is also possible to perform adjustment only in the X-axis direction or the Y-axis direction using either the main scanning direction detecting element 11 or the sub-scanning direction detecting element 15. Further, by adjusting the interval between the pulse outputs from the sub-scanning direction detecting element 15, it is possible to control the two optical paths so as to be equally spaced in the Y-axis direction. By doing so, the resolution can be doubled. At this time, it is only necessary to first combine all the laser lights into one, and then move each laser light by a designated amount. In this way, even if the number of laser light sources is increased, only a pair of vertical slits and a light receiving portion having oblique slits are required. There is no need to increase the number of light receiving elements in accordance with the number of light sources as in the conventional case. In this way, the resolution can be changed step by step. In contrast to the conventional optical path position detection in which dedicated optical detectors are provided independently for each of the two optical paths, in the present embodiment, the detection of the two optical paths can be performed simultaneously by one slit 13 or 17. It became so. Therefore, the size can be reduced as compared with the conventional device.

FIG. 2 shows how the laser light passes through the slit 33 of the light intensity detecting element 31. Laser light is focused on the photodiode 35. As shown in FIG. 2, the laser beam is condensed at a focal length of the photodiode 3.
5 shows the maximum light intensity when matched on top. The intensity of the light received by the photodiode 35 decreases regardless of whether the focal length is short or long. The received laser light is subjected to optical / electrical conversion by a converter (not shown). After that, the converted electric signal is input to the control unit 37. Then, calculation such as PID control is performed so that the amount of light received by the control unit 37 is maximized. Based on the calculation result, the micro-drive actuator 2
5A and 25B are controlled. As a result, it is possible to accurately perform focus position adjustment (correction of the laser spot diameter). Further, the minute drive actuators 21A, 2A,
Since 1B, 23A, 23B, 25A, and 25B can be controlled independently, the three axes (X, Y, and Z directions) can be aligned independently. Although the optical axis is corrected by moving the collimator lenses 3A and 3B directly, a method of moving other optical lenses may be used.

The coincidence of the two optical paths and the alignment of the focal point described above can be used not only for the initial adjustment, but also for correcting the tilt of the mirror surface provided around the polygon scanner 7. . This is polygon scanner 7
This is because a processing inclination error of about 0.1 μm at the maximum is expected between the mirror surfaces. The surface tilt correction and the position correction using a plurality of laser light sources can be adjusted simultaneously. This alignment is also effective against thermal expansion and aging. Further, in the conventional optical parts, the fθ lens 9 has to be designed so that the margin is large even for the defocus. For this reason, the fθ lens 9 is composed of a combination of a plurality of lenses. On the other hand,
In the present invention, the fθ lens 9 can be constituted by a single single lens because focus correction can be performed.

[0026]

As described above, according to the present invention, even if the number of light sources increases, the position of the optical path from each light source and the alignment of the focal point can be adjusted by one optical path interval detecting element in the scanning direction and one vertical axis. It can be realized by a simple detecting device such as a direction optical path interval detecting element, a light intensity detecting unit, a light receiving unit, a focus adjusting moving unit, and an optical path adjusting moving unit. Therefore, the size of the device can be reduced. In addition, the number of optical components can be reduced, for example, the number of optical components can be reduced to one, and the cost can be reduced.

[0027]

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a light intensity detection unit.

FIG. 3 is a diagram illustrating a state in which two laser beams displaced in the main scanning direction pass through a slit (vertical opening).

FIG. 4 is a diagram showing a state in which two laser beams displaced in the sub-scanning direction pass through a slit (inclined opening).

[Explanation of symbols]

 1A, 1B Light source 3A, 3B Collimator lens 5 Half mirror 7 Polygon scanner 9 fθ lens 11 Main scanning direction detecting element 13, 17, 33 Slit 15 Sub-scanning direction detecting element 21A, 21B Micro drive actuator (X-axis direction) 23A, 23B Micro-drive actuator (Y-axis direction) 25A, 25B Micro-drive actuator (Z-axis direction) 27, 29, 35 Photodiode 31 Light intensity detection element 37 Control unit

Claims (11)

[Claims] At least one light source, at least one optical lens for refracting light emitted from the light source, and an imaging surface for imaging the light refracted by the optical lens,
An optical operation device comprising: a focus adjustment moving unit that minutely moves at least one of the optical lenses in a focal direction so that an image formed on the image forming surface is sharp. 2. An optical path for finely moving at least one of the optical lenses in a direction perpendicular to an optical axis in order to adjust an optical path of light refracted by the optical lens, instead of the focus adjusting moving means. 2. The optical operating device according to claim 1, further comprising an adjustment moving unit. 3. The apparatus according to claim 1, further comprising: a light scanning unit that scans the light refracted by the optical lens between at least one of the optical lenses and the image forming surface.
Or the optical operation device according to claim 2. 4. A light source comprising: a plurality of light sources; an optical axis combining means for refracting light emitted from the light sources in the same direction; and at least one of the optical lens and the imaging surface or the optical lens and the light source. 4. The optical operation device according to claim 1, wherein the optical operation device is disposed between the scanning means. 5. A plurality of light sources, at least one optical lens for refracting light emitted from the light source, and optical scanning means for scanning light refracted by at least one of the optical lenses. A scanning direction optical path interval detecting element having a slit opened perpendicularly to the scanning direction of the optical scanning means for passing a part of the light scanned by the optical scanning means,
An optical path interval detecting device, comprising: a light receiving section that receives light that has passed through the scanning direction optical path interval detecting element; and a waveform shaping section that converts the light received by the light receiving section into an electric signal. 6. The scanning direction of the optical scanning means in order to pass a part of the light scanned by the optical scanning means instead of or together with the scanning direction optical path spacing detecting element. 6. The optical path interval detecting device according to claim 5, further comprising a vertical optical path interval detecting element having a slit opened at a predetermined inclination angle. 7. An optical axis combining means for refracting light emitted from said light source in the same direction is provided between at least one of said optical lenses and said optical scanning means. Or an optical operation device according to claim 6. 8. At least one light source, at least one optical lens for refracting light emitted from the light source, and an imaging surface for imaging the light refracted by the optical lens;
Light intensity detecting means for detecting the intensity of light in the vicinity of the imaging surface or the imaging surface, and at least one of the optical lenses so that an image formed on the imaging surface is sharp; An optical operation device comprising: a focus adjustment moving unit that minutely moves in a focal direction based on light intensity detected by a light intensity detection unit. 9. A plurality of light sources, at least one optical lens for refracting light emitted from the light source, and an optical axis for refracting light refracted by at least one of the optical lenses in the same direction. Synthesizing means, optical scanning means for scanning the light refracted by the optical axis synthesizing means, an image forming surface for imaging the light scanned by the optical scanning means, and light scanning by the optical scanning means. A scanning direction optical path interval detecting element having a slit opened perpendicularly to the scanning direction of the optical scanning means for passing a part thereof, a light receiving section for receiving light passing through the scanning direction optical path interval detecting element, and the light receiving section A waveform shaping unit for converting the light received by the optical lens into an electric signal; and at least one of the optical lenses for adjusting an optical path of the light refracted by the optical lens based on the electric signal converted by the waveform shaping unit. Perpendicular to the optical axis A light path adjusting movement means for finely moving the light path adjustment means, and the scanning direction light path interval detecting element and the light receiving section are arranged near the image forming plane. 10. A scanning direction of said optical scanning means for passing a part of light scanned by said optical scanning means instead of said scanning direction optical path spacing detecting element or together with said scanning direction optical path spacing detecting element. A vertical direction optical path interval detecting element having a slit opened at a predetermined inclination angle, and the vertical direction optical path interval detecting element and the light receiving section are arranged near the image plane. Item 10. An optical operation device according to Item 9. 11. The apparatus according to claim 1, wherein an ultrasonic motor is used as the focus adjusting moving means and / or the optical path adjusting moving means. Light operation device.