JP2001228430A - Data recorder using laser beam, and detection method of scanning locus deviation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that data of a main scanning direction are aslant recorded to the edge of a photosensitive film, and the quality of recording image quality deteriorates when the scanning locus of a laser beam deviates at the time of the data recording to the photosensitive film. SOLUTION: According to a detection state of the laser beam in photo-sensor 10-14, the existence of the scanning locus deviation of the laser beam is detected, when the scanning locus deviation of the laser beam is detected, the data recording operation of an optical system 6 is stopped, and an abnormal message to the periphery such as a monitor is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording apparatus for recording data by exposing a recording medium using a semiconductor laser or the like as a light source and a method for detecting a shift of a scanning locus of a laser beam.

[0002]

2. Description of the Related Art Conventionally, in a data recording apparatus for recording data on a recording medium such as a photosensitive film using a semiconductor laser or the like as a light source, a mechanism for detecting a shift of a scanning locus of a laser scanning light inside the apparatus is mounted. Did not. Since the laser recording device is composed of a combination of many optical components and mechanical components, even if the initial adjustment after assembly is performed, it is inevitable that a mechanical shift with time will occur after long-term operation. This causes a shift in the scanning trajectory of the laser beam, resulting in a decrease in the quality of a recorded image. FIGS. 8 to 10 show the configuration of a conventional laser recording apparatus. 8 is a main block configuration diagram of the entire apparatus, FIG. 9 is a plan configuration diagram of a data recording unit including a scanning mechanism and an optical system, and FIG. 10 is a side view thereof. As shown in FIG. 8, the main functional configuration includes a data receiving unit 101, a control unit 102, a monitor unit 103, and a data recording unit 104, and does not include a function of detecting a scanning locus. As shown in FIGS. 9 and 10, the data recording unit 104 also has no means for detecting the scanning trajectory of the laser beam. Therefore, in the conventional device,
After recording externally received data on a recording medium and visualizing the data, the human eye has found that the recording quality has deteriorated due to the deviation of the scanning locus of the laser beam. As a known example of a method of detecting a deviation of a scanning locus of a laser beam inside the apparatus, Japanese Patent Application Laid-Open No. HEI 8-29717 discloses a method in which a recording medium is mounted and a laser beam is scanned over the recording medium to perform recording. Describes a method of arranging a plurality of photosensors, calculating the amount of light received and the phase of each photosensor, and detecting the presence or absence of a scanning trajectory of the laser beam and the inclination of the deviation. More specifically, four photosensors are arranged horizontally in a line outside a recording area on a drum on which a recording medium is placed, and the light amount and phase of the laser detected by each of the four photosensors are set. The data is compared with the average value data prepared in advance by the arithmetic circuit, and the normal / abnormal of the laser light amount, the presence / absence of deviation of the scanning trajectory of the laser beam, and the inclination of the trajectory deviation are calculated.

[0003]

However, the above technique has the following problems. A first problem is that it is not possible to detect a scanning trajectory deviation of a laser beam smaller than the light receiving area size of each photosensor. The reason is that the width of one scanning of the laser beam is several tens of μm, and the light receiving size of the photo sensor is larger than the width. This is because no change occurs. As long as the scanning trajectory of the laser beam does not deviate from the light receiving area of the photosensor even a little, the laser light amount does not change.

[0004] The second problem is that a photosensor for detecting a laser beam is required to have high detection accuracy.
The reason is that in the above-described technology, since the shift of the scanning trajectory of the laser light is detected based on the light amount and the phase information, each photosensor must always maintain the same detection level of the laser light. That is, it is necessary to detect a minute change in the amount of laser light.

A third problem is that the photosensor may be erroneously detected due to dirt inside the apparatus. The reason is that when toner, dust, or the like adheres to the surface of the photosensor, the amount of laser light detected by the photosensor changes even if the scanning locus of the laser beam does not shift. The present invention has been made in view of the above-described disadvantages of the related art, and an object of the present invention is to detect a laser beam scanning trajectory deviation inside a device with higher accuracy than visual observation, without depending on human eyes. It is an object of the present invention to provide a method of detecting a deviation of a laser scanning trajectory, which enables an abnormality to be displayed when an abnormality is detected, and a data recording apparatus having the same.

[0006]

According to a first aspect of the present invention, there is provided a data recording apparatus using laser light according to the first aspect of the present invention. A two-dimensional data recording apparatus using a laser beam that translates any of the main scanning unit or the recording medium in a direction orthogonal to the main scanning direction and uses this as a sub-scanning unit. On the holding table for holding, a means for detecting the inclination of the scanning line formed by the laser light in the scanning direction is provided. According to a second aspect of the present invention, there is provided a data recording apparatus using laser light according to the second aspect of the present invention, wherein the laser light is provided on a holding table for holding the recording medium according to the first aspect of the present invention. The means for detecting the inclination of the scanning line in the scanning direction is located before the sub-scanning start end of the recording medium in the sub-scanning direction. A third aspect of the present invention is a data recording apparatus using a laser beam according to the present invention, wherein the laser beam is provided on a holding table for holding the recording medium according to the first and second aspects of the present invention. Means for detecting the inclination of the scanning line formed in the scanning direction by the groove provided in the holding table along the desired scanning line direction and a first light receiving portion provided at the bottom of the groove and at the center point of the main scanning. An element, a second light receiving element provided near the start end of the main scanning, a third light receiving element provided near the end of the main scanning, and a light receiving element provided near the start end of the main scanning and provided at the groove bottom. A fourth light-receiving element disposed at a position shifted forward in the sub-scanning direction from the first light-receiving element, and a fifth light-receiving element disposed at a position shifted rearward from the first light receiving element. Further, a data recording apparatus using a laser beam according to the invention according to claim 4 of the present invention is characterized in that the laser beam provided on a holding table for holding the recording medium according to the invention according to claim 1 or 2. Means for detecting the inclination of the scanning line formed in the scanning direction by the groove provided in the holding table along the desired scanning line direction and a first light receiving portion provided at the bottom of the groove and at the center point of the main scanning. An element, a second light receiving element provided near the start end of the main scanning, a third light receiving element provided near the end of the main scanning, and a light receiving element provided near the end of the main scanning and provided at the groove bottom. A fourth light-receiving element disposed at a position shifted rearward in the sub-scanning direction from the second light-receiving element, and a fifth light-emitting element disposed at a position shifted forward.
And a light receiving element. Further, a data recording apparatus using a laser beam according to the invention according to claim 5 of the present invention is characterized in that the laser beam provided on a holding table for holding the recording medium according to the invention according to claim 1 or 2. Means for detecting the inclination of the scanning line formed in the scanning direction by the groove provided in the holding table along the desired scanning line direction and a first light receiving portion provided at the bottom of the groove and at the center point of the main scanning. An element, a second light receiving element provided near the start end of the main scanning, a third light receiving element provided near the end of the main scanning, and a light receiving element provided near the start end of the main scanning and provided at the groove bottom. A fourth light receiving element disposed at a position shifted forward in the sub-scanning direction from the second light receiving element, and a third light receiving element provided near the end of the main scanning and provided at the bottom of the groove. A fifth light receiving element disposed at a position further shifted forward in the sub-scanning direction. The features. Further, a data recording apparatus using a laser beam according to the invention according to claim 6 of the present invention, wherein the laser beam is provided on a holding table for holding the recording medium according to the invention according to claim 1 or 2. Means for detecting the inclination of the scanning line formed in the scanning direction by the groove provided in the holding table along the desired scanning line direction and a first light receiving portion provided at the bottom of the groove and at the center point of the main scanning. An element, a second light receiving element provided near the start end of the main scanning, a third light receiving element provided near the end of the main scanning, and a light receiving element provided near the end of the main scanning and provided at the groove bottom. A fourth light receiving element disposed at a position shifted rearward in the sub-scanning direction from the third light receiving element, and a second light receiving element provided near the start end of the main scanning and provided at the bottom of the groove. A fifth light receiving element disposed at a position shifted backward in the sub-scanning direction from the element. And wherein the Rukoto. Further, a data recording apparatus using the laser light according to the invention according to claim 7 of the present invention is characterized in that the laser light provided on a holding table for holding the recording medium according to the invention according to claim 1 or 2. Means for detecting the inclination of the scanning line in the scanning direction formed by the first light receiving element located at the center point of the main scanning of the holding table, and a large number of means arranged along a direction inclined positively and negatively from the desired scanning line direction. The first located at the center point
X-shaped upward-sloping and downward-sloping 2 with the light receiving element of the intersection as 2
It is characterized by comprising a set of light receiving element rows. Also, a data recording apparatus using a laser beam according to the invention according to claim 8 of the present invention provides a data recording apparatus using the laser beam according to the inventions according to claims 1 to 7. The recording apparatus further receives an output of a means for detecting the inclination of the scanning line in the scanning direction. From the output, a first determination that the trajectory of the scanning line is the desired scanning direction, and whether the trajectory of the scanning line is positive or negative from the desired scanning direction. Second and third determinations deviating at an oblique angle, determination means for outputting a result other than the first to third determinations as a fourth determination, and the first to fourth determinations based on the output of the determination means. And a display means for displaying at least the determination of. Further, a data recording apparatus using a laser beam according to the ninth aspect of the present invention,
The display means according to the invention according to claim 7 further comprises means for emitting an alarm sound at the time of displaying at least the second to fourth determinations. According to a tenth aspect of the present invention, there is provided a method for detecting a scan trajectory shift in a data recording apparatus using a laser beam, wherein the first determination output by the determination means according to the eighth aspect to the display device is: The case where outputs from only the first, second and third light receiving elements according to claim 3 to 6 are simultaneously received, and the second determination is based on claim 3 to claim 6. 7. The method according to claim 3, wherein only the output from the fourth light receiving element is received, or the outputs from the fourth light receiving element and the first light receiving element according to claim 3 to 6 are simultaneously received. Wherein the output from the fourth light receiving element and the output from the third light receiving element are simultaneously received, and the third determination is based on only the output from the fifth light receiving element according to any one of claims 3 to 6. Receiving or receiving the fifth one of claims 3 to 6 7. An output from the optical element and the first light receiving element at the same time, or an output from the fifth light receiving element and the third light receiving element according to claim 3 to 6 at the same time. And Also,
In the method for detecting a scanning trajectory shift in a data recording apparatus using a laser beam according to the present invention according to claim 11 of the present invention, the first determination output by the determining means to the display device according to claim 8 is the following. 8. The light receiving element according to claim 7, wherein the output is received only from the first light receiving element, and the second determination is any one of the light receiving elements constituting the light receiving element row of the lower right of the claim 7. And the third determination is a case where the third determination is made including an output from any of the light-receiving elements constituting the light-receiving element array of the lower right of claim 7. It is characterized by.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. As shown in the functional block diagram of FIG. 1, a data recording apparatus using a laser beam as a light source according to the present invention has a data receiving unit 1 for receiving data to be recorded from outside, and a control unit for controlling the operation of the entire apparatus. Unit 2, a monitor unit 3 for notifying the operating status of the apparatus to the outside, and a control unit 2.
It comprises a data recording unit 4 for recording the received data sent from the storage medium on a recording medium, and a scanning trajectory detecting unit 5 for detecting the deviation of the scanning trajectory of the laser beam.

The data recording section 4 is a scanning mechanism and an optical system for scanning the inner surface of a laser cylinder.
This will be described with reference to FIG. As shown in the plan view of FIG. 2, the data recording unit irradiates a laser beam onto a photosensitive film 8 as a recording medium to record received data.
One scanning of the laser beam parallel to the edge of the drum 7 at the intermediate position between the lower end of the optical system 6 at the standby position 28 and the sub-scanning start end on the upper side of the photosensitive film 8 Grooves 9 open on the drum with a width of minutes
And photosensors 10 to 13 which are attached to the bottom of the groove 9 and detect the scanning trajectory of the laser beam. The laser beam rises rightward from the point A of the main scanning start end on the drum 7 to the point B of the main scanning end. FIG. 3 is a side view of a photosensor 10 for detecting laser light when scanning is performed, a photosensor 14 for detecting laser light when scanning rightward, and a data recording unit 4. As shown in FIG. 3, a sub-scanning motor 15 for moving the optical system 6 from the standby position 28 to the recording completion position 29, and a shaft connected to the sub-scanning motor 15 for supporting the movement of the optical system 6 in the sub-scanning direction. 16 and a shaft 17 for supporting the optical system 6 on the opposite side of the shaft 16
Consists of The width of the groove 9 is formed so that only one main scanning light for forming an image can be received. Although the photo sensor 10 for detecting the above-described upwardly traversing scanning locus is located near the main scanning start end in FIG. 2, it may be located near the main scanning end end. In addition, the photo sensor 14 for detecting the scanning locus of the lower right is also located near the main scanning start end in FIG. 2, but may be located near the main scanning end end.

FIG. 7 is a view of the optical system 6 as viewed from the right side. As shown in FIG. 7, the optical system 6 includes a laser light source 18 for emitting laser light and a laser light emitted from the laser light source 18. FIG. 4 shows a condensing lens 20 for condensing, a deflecting mirror 21 for deflecting the laser light passing through the condensing lens 20 by 90 °, a deflecting mirror 22 for further deflecting the laser light from the deflecting mirror 21 by 90 °. A rotating prism 23 for causing the laser beam to scan in the main scanning direction on the photosensitive film 8,
Main scanning motor 24 for rotating rotating prism 23
And laser emission control of the laser light source 18 and the main scanning motor 2
4 comprises an optical system control circuit 19 for controlling the rotation.

FIG. 5 is a front view of the optical system and the drum viewed from the point C in the side view of FIG. 4. As shown in FIG. 5, the drum 7 is located at the points D, E, and F. In order to make the distance between the lens and the rotating prism the same, the concave prism has a semicircular shape.

Next, the operation of the embodiment of the present invention will be described. First, the image data of the dot pattern sent from the outside is received by the data receiving unit 1 shown in FIG. The image data received by the data receiving unit 1 is converted from analog data to digital data and transferred to the control unit 2. When one page of received data is stored in the control unit 2, the received data is transmitted from the control unit 2 to the optical system 6 which is a constituent device of the data recording unit 4 shown in FIG. The received data received by the optical system 6 is stored in an optical system control circuit 19 which is a component of the optical system 6 shown in FIG. When the storage of the received data in the optical system control circuit 19 is completed, the operation proceeds to the recording operation on the photosensitive film 8. The sub-scanning motor 15 in FIG.
Rotates, and moves in the sub-scanning direction shown in FIG. 2 while the optical system 6 is supported by the shafts 16 and 17. Optical system 6
At the point above the groove 9 shown in FIG. 3, the stop signal from the control unit 2 stops the rotation of the sub-scanning motor 15.
Thus, the movement of the optical system 6 stops.

Next, a rotation command of the main scanning motor 24 is transmitted from the control unit 2 to the optical system control circuit 19 shown in FIG.
In response to a rotation command from the control unit 2, a pulse signal is transmitted from the optical system control circuit 19 to the main scanning motor 24, the main scanning motor 24 rotates at a constant speed, and the rotating prism 23 connected to the main scanning motor 24 also rotates. It rotates at the same speed as the main scanning motor 24. Next, a laser beam is emitted from the laser light source 18 according to a command from the optical system control circuit 19. The laser light emitted from the laser light source 18 and condensed by the condensing lens 20 is 90 ° by the deflecting mirror 21 in FIG.
Be deflected. The laser light deflected by 90 ° by the deflection mirror 21 is further deflected by 90 ° by the deflection mirror 22. The laser light deflected by 90 ° by the deflecting mirror 22 is applied to the rotating prism 23 in FIG. As shown in FIG. 5, the laser beam applied to the rotating rotating prism 23 is, as shown in FIG.
Main scanning is performed in the direction of the point. The scanned laser beam passes over the groove 9 in FIGS. Assuming that the scanning trajectory of the laser beam is normal, the trajectory becomes the laser beam 26 shown in FIG.
Detected at 12,13. Photo sensors 11, 12, 1
3 is mounted parallel to the edge of the drum 7, the trajectory of the laser beam 26 detected only by the photosensors 11, 12, 13 is parallel to the edge of the drum 7, and the scanning trajectory of the laser beam Means normal. On the other hand, if the mounting positions of the deflecting mirrors 21 and 22 and the rotating prism 23 are shifted in the optical system 6 shown in FIG. 4, the scanning trajectory of the laser beam is not scanned in parallel with the edge of the drum 7. become. In the case of the locus of the laser beam 25 shown in FIG. 2, the photosensors 10 and 1 shown in FIG.
Since only 2 detects the laser beam, the trajectory of the laser beam 25 is not scanned in parallel with the edge of the drum 7,
Indicates that the trajectory is not normal. At this time, since the photo sensor 10 is attached to the bottom of the left end of the groove 9, when only the photo sensors 10 and 12 detect the laser light, the trajectory of the laser light 25 moves from the point A shown in FIG.
This indicates that the trajectory is rising to the right in the direction of the point. In the case of the laser beam 27, since only the photosensors 12 and 14 shown in FIG.
Similar to 5, it is downward-sloping, indicating that it is not normal.
At this time, the scanning trajectory of the laser light 27 indicates that the scanning trajectory is downwardly rightward from the point A to the point B as shown in FIG. The detection signals of the photosensors 10 to 14 when the laser light scans the groove 9 are transmitted to the scanning trajectory detection unit 5 shown in FIG. The scanning trajectory detecting section 5 compares the data shown in FIG. 6 held therein with the detection signals of the photosensors 10 to 14, and determines whether the scanning trajectory of the laser beam is normal / abnormal, the direction of the deviation at the time of abnormal scanning, and the apparatus. Determine the abnormality.

Next, the operation of the scanning trajectory detecting section 5 will be described with reference to FIG. 6, the pattern of item No. 2 is a case where only the photo sensor 14 detects the laser light, and has a scanning locus close to the laser light 27 shown in FIG.
The trajectory is downward-sloping from the point to the point B. The pattern of item No. 4 is a case where only the photosensors 13 and 14 are detecting the laser light. Similar to the pattern of item No. 2, the scanning locus is close to the laser light 27, and the locus is lower right. Become. The pattern of item No. 6 is a case where only the photosensors 12 and 14 are detecting the laser light, and is a scanning locus of the laser light 27 shown in FIG. The pattern of item No. 15 is a case where only the photosensors 11, 12, and 13 are detecting laser light, and is a scanning locus of the laser light 26 shown in FIG. Indicates that there is. The pattern of item No. 17 is a case where only the photosensor 10 is detecting the laser light, and has a scanning locus close to the laser light 25 shown in FIG. Will be. The pattern of item No. 19 is a case where only the photosensors 10 and 13 are detecting laser light, and has a scanning locus close to the laser light 25 shown in FIG.
Similar to the pattern of item No. 17, the locus rises to the right. The pattern of item No. 21 is a case where only the photosensors 10 and 12 detect the laser light, and the laser light 2 shown in FIG.
5 is the scanning trajectory, and the trajectory is rising to the right. In FIG. 6, the above item numbers 2, 4, 6, 15, 17, 19, and 21
The other patterns are patterns that are not detected due to the accuracy of the product as long as there is no abnormality in the hardware or software of the device.

When the scanning trajectory detecting section 5 determines that the scanning trajectory of the laser beam is normal, the operation shifts to the recording operation of the received data stored in the optical system control circuit 19 shown in FIG. Upon completion, the optical system 6 returns to the standby position shown in FIG. 2, and the apparatus is also in a standby state.

When the scanning trajectory detecting unit 5 determines that the scanning trajectory of the laser beam is any of the patterns 2, 4, 6, 17, 19, and 21 in FIG. Is abnormal, the recording operation of the received data is not performed, the optical system 6 is returned to the standby position, and the fact that the scanning trajectory of the laser beam is abnormal and the inclination information of the deviation of the optical axis are transmitted to the monitor unit 3 shown in FIG. Display. First, the control unit 2 issues an instruction to stop the rotation of the main scanning motor 24 in FIG.
9, a rotation command for returning the optical system 6 to the standby position 28 shown in FIG. 2 is transmitted to the sub-scanning motor 15 shown in FIG. As a result, the optical system 6 returns to the standby position 28 shown in FIG. Next, the control unit 2 transfers to the monitor unit 3 an alarm for alarming the surroundings that the scanning trajectory of the laser beam is abnormal and a display instruction of the inclination information of the deviation of the optical axis. As a result, the monitor 3 displays the alarm and the inclination information of the deviation of the scanning trajectory.

When the scanning trajectory detecting unit 5 determines that the scanning trajectory of the laser beam is a pattern other than the item numbers 2, 4, 6, 17, 19, and 21 in FIG. Is determined to be abnormal, the recording operation of the received data is not performed, and the rotation of the sub-scanning motor 15 in FIG. 3 and the main scanning motor 24 shown in FIG. Is displayed. First, in a state where the optical system 6 is at the position above the groove 9 shown in FIG. 3, the control unit 2 sends the optical system control circuit 1 shown in FIG.
9, a stop command for the main scanning motor 24 is transmitted. Thus, the main scanning motor 24 and the rotating prism 23 stop. Next, from the control unit 2, the sub-scanning motor 15 shown in FIG.
Is transmitted, and the rotation of the sub-scanning motor 15 is stopped. Next, the control unit 2 transmits a command to cause the monitor unit 3 shown in FIG. 1 to display that there is an abnormality inside the apparatus.
As a result, an alarm indicating a device internal abnormality is displayed on the monitor unit 3.

As described above, in the optical axis trajectory displacement detection method according to the present invention, after recording the conventional reception data on the recording medium, it is possible to confirm that a human has discovered an abnormality before recording the data. In the apparatus, the deviation of the scanning locus of the laser beam is detected beforehand, and when there is an abnormality, the abnormality is notified to the surroundings, so that the use of the recording medium can be reduced and the abnormality of the apparatus can be quickly detected.

Next, another embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. Photosensors 10 to 14 shown in FIG.
As shown in FIG. 7, a plurality of photosensors are arranged diagonally on the inner surface of the drum instead of the grooves 9 to detect the scanning trajectory of the laser beam. By arranging a plurality of photosensors on a diagonal line, in the first embodiment, in order to narrow the detection accuracy of the photosensors to a width corresponding to one scanning of the laser beam, the photosensors are provided on the drum 7 shown in FIG. The groove 9 becomes unnecessary.

Next, the operation of detecting the scanning locus of the laser beam in FIG. 7 will be described. First, in FIG. 10, n groups of photo sensors A and B are arranged on the diagonal with the photo sensor 30 at the center. The number of photo sensors to be arranged depends on the recording medium used in various products and the number of photo sensors shown in FIG.
Since it varies depending on the size of the drum 7 and the specifications of the photosensor to be used, the number is assumed to be n here.
Next, the optical system 6 is moved to the position of the photo sensor 30,
Stop. The moving means is the same as the method described in the embodiment. The laser is emitted to scan on the drum 7 shown in FIG. At this time, if the scanning locus of the laser beam is normal,
The scanning trajectory of the laser beam becomes the laser beam 2 shown in FIG.
Only the photo sensor 30 detects the laser light. On the other hand, when the scanning locus of the laser light shifts, any one of the n photo sensors in the photo sensors A and B shown in FIG. 7 detects the laser light.

From the above, the normal / abnormal of the scanning locus of the laser beam and the inclination of the scanning locus of the laser beam at the time of abnormality are analyzed based on the detection status of the laser beam in each of the n photosensors of the photosensors A and B. You can do it.

Such a plurality of photo sensor groups may be formed by combining individual light receiving elements, or may be formed integrally on a single chip.

In the above-described embodiment, a case has been described in which the main scanning optical system in which a reflection rotating mirror on one surface and a focusing lens are disposed in front of the rotating mirror is translated to perform sub-scanning. The scanning surface has a cylindrical inner surface structure because of the configuration of a so-called post-projection optical system in which a focusing lens is placed in front of the rotating mirror, but the present invention is not limited to only such a case. For example, fθ which is a focusing lens after a rotating mirror
This is also effective in a configuration in which a lens is provided to perform planar scanning. Further, the rotating mirror is not limited to one surface, and may be a polygon mirror. If there is a tilt between the surfaces, a toroidal lens may be placed between the fθ lens and the scanning surface. Also,
Instead of translating the main scanning optical system to perform sub-scanning, the main scanning optical system is fixed without translating, and instead, the scanning bed on which the photoconductor is placed is translated and sub-scanning is performed. Even so, the present invention is effective. In addition, although the case where the recording medium is a photosensitive film has been described, the present invention is not limited to this. For a recording apparatus using any photosensitive member that is exposed to laser light, such as an electrophotographic photosensitive plate or a resin plate for laser direct plate making, The present invention is effective.

[0023]

According to the present invention, the first effect is that, when a consumable type recording medium such as a photosensitive film is used as the recording medium, the amount of use can be reduced. The reason is that, in the prior art, after the received data was recorded on the recording medium, human eyes discovered that the recording quality was degraded due to the deviation of the scanning trajectory of the laser beam. Before recording on the recording medium, it detects whether there is any deviation of the scanning locus of the laser beam inside the device, and if there is any abnormality, does not record the data, displays an alarm on the monitor, and alerts the surroundings of abnormality. It is for performing.

The second effect is early detection of deviation of the scanning trajectory of the laser beam. The reason is that, in the prior art, the deterioration of the recording quality was detected by the human eye, so that the scanning locus deviation of the laser beam at a level that cannot be confirmed by the human eye could not be detected early, According to the present invention, it is possible to detect the deviation of the trajectory at the initial stage by detecting the deviation of the scanning trajectory of the laser beam at a level that cannot be confirmed by human eyes.

A third effect is that the adjustment of the scanning trajectory of the laser beam is facilitated. The reason is that in the prior art, when the LD light source, the condenser lens, and the return mirror in the optical system were replaced, a dedicated adjustment jig was used to adjust and confirm the scanning locus of the laser beam. This is because, according to the present invention, it is possible to determine whether or not the scanning trajectory of the laser light inside the apparatus is good.

[Brief description of the drawings]

FIG. 1 is a diagram showing a functional block diagram of a data recording apparatus using a laser beam as a light source according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a configuration of a data recording unit of the data recording apparatus using a laser beam as a light source according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a side surface of a sub-scanning mechanism of a data recording unit of the data recording apparatus using a laser beam as a light source according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a side surface of a main scanning optical system of a data recording unit of the data recording apparatus using a laser beam as a light source according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating a front side of a main scanning optical system and a scanning drum of a data recording unit of the data recording apparatus using a laser beam as a light source according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating a data table of a scanning trajectory detection unit of the data recording apparatus using a laser beam as a light source according to the first embodiment of the present invention.

FIG. 7 is a diagram illustrating a part of a plane of a data recording unit of a data recording apparatus using a laser beam as a light source according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a block configuration diagram of a conventional laser scanning data recording device.

FIG. 9 is a plan view of a data recording unit of a conventional laser scanning data recording device.

FIG. 10 is a side view of a data recording unit of a conventional laser scanning data recording device.

[Explanation of symbols]

 Reference Signs List 1 data receiving unit 2 control unit 3 monitoring unit 4 data recording unit 5 scanning locus detection unit 6 optical system 7 drum 8 photosensitive film 9 groove 11 photo sensor 12 photo sensor 13 photo sensor 14 photo sensor 15 sub-scanning motor 16 shaft 17 shaft 18 Laser light source 19 Optical system control circuit 20 Condensing lens 21 Deflection mirror 22 Deflection mirror 23 Rotating prism 24 Main scanning motor 25 Laser light 26 Laser light 27 Laser light 28 Standby position 29 Recording completion position 30 Photosensor 101 Data receiving unit 102 Control unit 103 monitor unit 104 data recording unit

Claims (11)

[Claims] 1. A laser beam is one-dimensionally scanned on a recording medium and used as a main scanning means, and either the main scanning means or the recording medium is translated in a direction orthogonal to the main scanning direction. Using laser light with this as a sub-scanning means 2
A two-dimensional data recording apparatus, comprising: means for detecting, on a holding table for holding the recording medium, a tilt of a scanning line formed by the laser light in a scanning direction, the data recording using the laser light. apparatus. And means for detecting the inclination of a scanning line formed by the laser beam in the scanning direction, provided on a holding table for holding the recording medium, in a sub-scanning direction, before a sub-scanning start end of the recording medium. 2. A data recording apparatus using a laser beam according to claim 1, wherein 3. A groove, provided on a holding table for holding the recording medium, for detecting the inclination of the scanning line formed by the laser light in the scanning direction, the groove being provided along the desired scanning line direction on the holding table. A first light receiving element provided at the bottom of the groove at the center of the main scanning, a second light receiving element provided near the start end of the main scanning, and a second light receiving element provided near the end of the main scanning. The third light-receiving element and the fourth light-receiving element are located near the start end of the main scanning and are located at positions shifted forward in the sub-scanning direction from the first light-receiving element provided at the bottom of the groove. 3. The data recording apparatus using a laser beam according to claim 1, further comprising a fifth light receiving element disposed. 4. A groove, provided on a holding table for holding the recording medium, for detecting a tilt of a scanning line formed by the laser light in a scanning direction, the groove being provided along the desired scanning line direction on the holding table. A first light receiving element provided at the bottom of the groove at the center of the main scanning, a second light receiving element provided near the start end of the main scanning, and a second light receiving element provided near the end of the main scanning. The third light-receiving element and the fourth and front-shifted positions near the end of the main scanning, which are arranged at positions shifted rearward in the sub-scanning direction from the second light-receiving element provided at the groove bottom. 3. The data recording apparatus using a laser beam according to claim 1, further comprising a fifth light receiving element disposed. 5. A groove provided on a holding table for holding the recording medium, wherein the means for detecting the inclination of the scanning line formed by the laser light in the scanning direction is provided along the desired scanning line direction on the holding table. A first light receiving element provided at the bottom of the groove at the center of the main scanning, a second light receiving element provided near the start end of the main scanning, and a second light receiving element provided near the end of the main scanning. A third light-receiving element and a fourth light-receiving element which are disposed near the start end of the main scanning and are shifted forward in the sub-scanning direction from the second light-receiving element provided at the bottom of the groove. Fifth, which is located near the end of scanning and located at a position shifted forward in the sub-scanning direction from the third light receiving element provided at the bottom of the groove.
3. A data recording apparatus using laser light according to claim 1, further comprising: a light receiving element. 6. A groove provided on a holding table for holding the recording medium, wherein the means for detecting the inclination of the scanning line formed by the laser light in the scanning direction is provided along the desired scanning line direction on the holding table. A first light receiving element provided at the bottom of the groove at the center of the main scanning, a second light receiving element provided near the start end of the main scanning, and a second light receiving element provided near the end of the main scanning. A third light-receiving element and a fourth light-receiving element disposed near the end of the main scanning and shifted rearward in the sub-scanning direction from the third light-receiving element provided at the groove bottom; In the vicinity of the start end of the main scan, the second
3. The data recording apparatus using laser light according to claim 1, further comprising a fifth light receiving element disposed at a position shifted rearward in the sub-scanning direction from the light receiving element. 7. A means for detecting the inclination of a scanning line formed by the laser beam in the scanning direction provided on a holding table for holding the recording medium, wherein the first means is located at a center point of the main scanning of the holding table. And two sets of X-shaped light-receiving elements arranged in an X-shape with the first light-receiving element located at the center point intersecting the first light-receiving element arranged at a plurality of points along a direction inclined positively and negatively from the desired scanning line direction. The data recording apparatus using a laser beam according to claim 1 or 2, further comprising: 8. A data recording apparatus using a laser beam according to claim 1, further comprising an output of a means for detecting an inclination of the scanning line in a scanning direction, and receiving the output of the scanning line from the output. The first determination that the trajectory is the desired scanning direction, the second and third determinations in which the trajectory deviates from the desired scanning direction by positive and negative oblique angles, and the fourth determination other than the first through third determinations The data using laser light according to claim 1, further comprising: a determination unit that outputs a determination, and a display unit that displays at least the first to fourth determinations based on an output of the determination unit. Recording device. 9. The apparatus according to claim 7, wherein said display means further comprises means for issuing an alarm sound at least when displaying said second to fourth determinations. Data recording device. 10. The first determination output by the determination means to the display device includes the step of simultaneously receiving outputs only from the first, second and third light receiving elements according to claim 3 to 6. The second determination is made by receiving only the output from the fourth light receiving element according to any one of claims 3 to 6, or performing the second determination with the fourth light receiving element according to any one of claims 3 to 6. The third light receiving element may receive the output from the first light receiving element at the same time, or the fourth light receiving element and the third light receiving element may simultaneously receive the output from the third light receiving element.
Is determined by receiving only the output from the fifth light receiving element according to any one of claims 3 to 6, or by determining the output from the fifth light receiving element and the first light receiving element according to any one of claims 3 to 6. Or at the same time, receiving the fifth
9. The method according to claim 8, wherein the outputs from the light receiving element and the third light receiving element are simultaneously received. 11. The first judgment output by the judging means to the display device is a case where an output from only the first light receiving element according to claim 7 is received, and the second judgment is made. And receiving an output from any one of the light receiving elements constituting the light receiving element row of the downward-sloping light-receiving element according to claim 7; 9. The method for detecting a scanning trajectory shift in a data recording apparatus using a laser beam according to claim 8, wherein the method includes receiving an output from any of the light receiving elements constituting the light receiving element row.