JPS6285568A - Light beam scan device - Google Patents

Abstract

PURPOSE:To accurately control the reading and recording start positions of the light beam by using the materials of different beam reflection factors to form a scan sheet and a holding surface and detecting the change of the reflected light by a photodetector. CONSTITUTION:When a recording medium 5 is stopped at a prescribed position on a holing surface 11a of a recording medium holding means 11, a recording device starts the 2-dimensional scan by a light beam 2. A photodetector 12 is provided above the edge of the medium 5 and in the secondary scan direction. While the surface of the medium 5 and the surface 11a have different beam reflection factors. Therefore the reflected light of the beam 2 has a change when the beam 2 moves toward the medium 5 in the secondary scan direction by the rotation of a secondary scan mirror 10 and reaches the edge of the medium 5. The detector 12 detects the change of the reflected light and delivers a detecting signal. Then a picture signal output circuit 8 starts output of the picture signal by said detecting signal. Thus it is possible to start accurately the substantial recording at a desired position, like an edge on the medium 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a light beam scanning device that scans a light beam using an optical deflector. The present invention relates to a scanning device.

(Technical Background and Prior Art of the Invention) Conventionally, a light beam scanning device that deflects a light beam using an optical deflector and scans a scanning sheet relatively two-dimensionally has been used for various types of scanning recording scanning, scanning reading Hf1f. It is widely used in etc. Two-dimensional scanning of the light beam in these light beam scanning devices involves deflecting the light beam with an optical deflector to cause it to main scan the scanning sheet, and also moving the light beam and the scanning sheet relative to each other in the main scanning direction. This is performed by moving in the OJ scanning direction substantially perpendicular to the .

However, in the conventional apparatus, a number of problems have arisen, such as the apparatus becoming larger due to the means for performing the sub-scanning, and the optical system becoming complicated and expensive. Hereinafter, problems with conventional light beam scanning devices will be explained with reference to FIGS. 5 and 6.

In the light beam scanning device shown in FIG.
The light beam 102 emitted from 01 enters the rotating polygon 1 [103] which is an optical deflector, and the rotating polygon mirror 103 moves in the direction of arrow A.
It is reflected and deflected as it rotates in this direction. The light beam 102 reflected by the rotating polygon mirror 103 passes through an fθ lens 104, which is an imaging lens, provided on the optical path E, and then main scans the scanning sheet 105 in the direction of arrow B. The scanning sheets 1 to 105 are sandwiched between a rotating drum 106 that rotates in the direction of arrow C and a pair of rollers 107A and 107B provided on the rotating drum 10G, and the scanning sheets 1 to 105 rotate as the rotating drum 106 rotates. Sub-scanning is performed by being conveyed in the direction indicated by the arrow, which is substantially perpendicular to the scanning direction.

Therefore, the light beam 102 is repeatedly main-scanned in the direction of the arrow B over the scanning sheet 105 that is conveyed (sub-scanned) in the direction of the arrow Dh.
is scanned two-dimensionally.

However, in the above-mentioned apparatus, sub-scanning is performed by moving the scanning sheet 105, but in order to suppress load fluctuations to the motor 108 during sub-scanning as much as possible to prevent iW1 scanning unevenness from occurring, as shown in FIG. Before and after the scanning position by the light beam, the scanning sheet
It is necessary to provide a space in which one scanning sheet can be placed on each of the scanning sheets, such as by arranging supporting stands 109 and 110 that support the scanning sheets 105. For this reason, the above-mentioned apparatus requires a space that is equal to or more than two scanning sheets in the sub-scanning direction, resulting in an increase in the size of the entire apparatus. Further, the rotating drum 106 that conveys the scanning sheet has a width larger than the width of the scanning sheet in order to stably convey the scanning sheet, and the motor 108 that rotates this rotating drum 106 further rotates. Since it is provided in the width direction of the drum, the above device is also large in the main scanning direction.

Furthermore, in order to perform highly accurate scanning on the scanning sheet while conveying the scanning sheet, it is necessary to strictly control the motor so that the scanning sheet can be conveyed with high precision in the correct direction at a constant speed. However, since a highly accurate motor that can be controlled as described above is expensive, there is also the problem that the cost of the entire device increases significantly. Also, scanning sea 1~
In order to stably convey the roller 105, the roller 107A is
, 1073 are essential, but these rollers 107
The provision of A and 107B also causes the inconvenience that scanning cannot be performed at both ends of the scanning sheet 105 in the sub-scanning direction.

As described above, there are various problems with a light beam scanning device that performs constant scanning by conveying a scanning sheet.

In view of these problems, a device has been proposed that performs sub-scanning without moving the scanning sheet.Hereinafter, a light beam scanning device with a fixed scanning sheet will be described with reference to FIG. Note that the same parts as those in the apparatus shown in FIG. 5 are given the same numbers and their explanations will be omitted.

The apparatus shown in FIG. 6 includes a rotating polygon 1103 which rotates in the six directions of arrows to reflect and deflect the light beam 102, and performs main scanning on the scanning sheet 111 in the direction of arrow B.
At the same time, a sub-scanning galvanometer mirror 112 is provided which rotates at a low speed in the direction of arrow C and reflects and deflects the light beam 102 so that the main scanning line moves in the direction of the arrow on the scanning sheet 111 fixed at a predetermined position. It is being That is, the sub-scanning galvanometer mirror 112 rotates once in the direction of arrow C at a low speed while scanning one scanning sheet, and the light beam 102 is rotated once in the direction of arrow C when scanning one scanning sheet. Sub-scanning galvanometer mirror 11
2 allows the entire surface of the scanning sheet 111 to be scanned in two-dimensional directions. Sub-scanning galvanometer mirror 112
When scanning for one scanning sheet 111 is completed, it returns to its original position and prepares for scanning for the next scanning sheet. Further, an fθ lens 113 which is an imaging lens is provided between the sub-scanning galvanometer mirror 112 and the scanning sheet 111, and this fθ lens 113 is connected to the rotating polygon mirror 103 and the sub-scanning galvanometer mirror 1.
A light beam 102 is reflected and deflected by 12 at a substantially constant angular velocity.
is scanned in a straight line at a substantially constant speed on one surface of a flat scanning sheet 111.

By the way, in the above-mentioned apparatus, in order to make the light beam 102 deflected by the rotating polygon mirror 103 and take a wide optical path enter the reflecting surface of the relatively small Wl scanning galvanometer mirror 112, the optical path of the light beam 102 is temporarily changed. After converging and moving this converging position, the rotating polygon mirror 103
A relay lens 114 is provided for adjusting the optical path of the light beam 102 so as to reproduce and spread the deflection caused by the light beam 102. The sub-scanning galvanometer mirror 112 is arranged at a position where the optical path of the light beam 102 is focused by the relay lens 114.
4, all sub-scanning galvanometer mirrors 112
The beam is made incident on the beam and deflected. , WJj After being deflected by the galvanometer mirror 112 for scanning, the light beam 102 widens its optical path again at an angle corresponding to the deflection of the rotating polygon mirror 103, so that it has the required length on the scanning sheet 111. main scanning lines are obtained.

However, since the apparatus shown in FIG. 6 is provided with the relay lens 114 in addition to the imaging lens 113 as described above, the optical system becomes complicated, and it is difficult to achieve sufficient miniaturization of the apparatus. I can't.

There is also the problem that the provision of the relay lens 114 increases the number of optical elements, which increases manufacturing costs.

(Object of the Invention) The present invention has been made in view of the above problems, and sub-scanning is performed without moving the scanning sheet, and various problems such as an increase in the size of the device due to the movement of the scanning sheet. W? The purpose of the present invention is to provide a light beam scanning device that can further downsize the entire device and reduce manufacturing costs by performing scanning without using a complicated optical system equipped with expensive optical elements. That is.

(Structure of the Invention) A light beam scanning device of the present invention includes: a main scanning optical deflector that is provided on an optical path of a light beam emitted from a beam light source and deflects the light beam; an imaging lens provided on the optical path of the deflected light beam; a mirror provided on the optical path of the light beam passing through the imaging lens to reflect the light beam with a reflective surface; a sub-scanning mirror that rotates about a rotation axis approximately about the intersection of a plane containing the optical path of the light beam that has passed through the imaging lens or a plane parallel to the plane and a plane perpendicular to the optical axis of the imaging lens; A first feature of the present invention is that it includes a scanning sheet holding means that holds the scanning sheet in an arcuate shape having a central axis that substantially coincides with the drive axis of the sub-scanning mirror.

That is, in the light beam scanning device of the present invention, since the scanning sheet is fixed by the scanning sheet holding means, it is not necessary to make the device large in the sub-scanning direction, such as when carrying the scanning sheet and performing 01 scanning. There is no need to do this, and the entire device can be made more compact. In addition, the light beam reflected by the main-scanning optical deflector passes through the main-scanning imaging lens and is directly reflected by the sub-scanning mirror for sub-scanning, so there is no need to provide a relay lens, etc. The system becomes simple and inexpensive. Note that the light beam whose optical path has been expanded by being deflected by the main scanning optical deflector enters the sub-scanning mirror, so in terms of the design of the optical system,
Preferably, it is a long mirror extending in the main scanning direction.

Furthermore, in the apparatus of the present invention, the scanning sheet is held by the scanning sheet holding means as described above, and the light beam is
The scanning sheet stopped on the scanning sheet holding surface of the scanning sheet holding means is two-dimensionally scanned. Therefore, the light beam can start the actual scanning for reading or recording from a desired position in the sub-scanning direction, such as an edge in the sub-scanning direction, on the scanning sheet 1 to above.
For this purpose, it is necessary that the light beam be controlled so as to start substantial scanning from a predetermined position in the sub-scanning direction of the scanning sheet. Therefore, in the apparatus of the present invention, the surface of the scanning sheet and the holding surface of the scanning sheet holding means are formed of materials having different light beam reflectances, and the edge of the scanning sheet held on the holding surface in the sub-scanning direction A second feature is that a photodetector for detecting light reflected from the holding surface is provided above the holding surface.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an outline of a light beam recording device which is an embodiment of the light beam scanning device of the present invention.

The light beam 2 emitted from the laser light source 1 is the image 18
A main scanning optical deflector that rotates in the direction of the arrow after entering the modulator 6 and being modulated by the modulator drive circuit 7 based on the signal emitted from the image signal output circuit 8 that outputs the signal. The light enters a certain rotating polygon mirror 3 and is deflected. The laser light source 1 is a t-1e-N e laser, A
In addition to the r laser, a laser light source, etc., which is a combination of a semiconductor laser and a beam shaping optical system, is used. Mar
When using a laser light source capable of direct modulation such as a C1 semiconductor laser, the modulator 6 is not particularly provided in the optical path of the light beam 2, and the laser light source 1 is directly controlled to modulate the light beam 2. You can also do it. Further, as the main scanning optical deflector, in addition to the above-mentioned rotating polygon mirror, other types of optical deflectors such as a galvanometer mirror and an acousto-optic optical deflector (AOD) may be used.

Said rotating polygon &? ! The light beam 2 deflected by 3 passes through an imaging lens 4, such as an fθ lens, provided in the optical path (2), and then is driven by a motor 9 and moves at a low speed to arrow C.
The light is incident on the reflective surface 10a of a sub-scanning mirror 10 extending in the main-scanning direction and rotating in the main-scanning direction, and is reflected. Further, the sub-scanning mirror 1 below this sub-scanning mirror 10
On the optical path of the light beam 2 reflected by 0, there is a sheet-like recording material such as photographic film or photographic paper (scanning sheet).
5 is a recording medium holding means 1 having an arcuate holding surface 11a;
1, it is held in an arcuate shape. This holding means 11
is formed by, for example, bending a plate-like object or integrally molding a synthetic resin or the like. Further, the central axis of the circular arc surface formed by the recording body 5 is the above-mentioned r:t+
This almost corresponds to one rotation of the inspection mirror 10.

When the recording medium 5 is held by the recording medium holding means 11L as described above, the light beam 2 deflected by the rotating polygon mirror 3
performs main scanning on the recording medium 5 in the direction of arrow B. The imaging lens 4 converges the light beam 2 onto the recording medium 5 and directs the optical beam 2 deflected by the rotating polygon mirror 3 at a lattice angular velocity onto the recording medium 5 which is flat in the main scanning direction at a substantially constant velocity. This is a lens that allows scanning. Further, the sub-scanning mirror 1
0 is the direction of arrow C, with the intersection of a plane containing the optical path of the light beam 2 that has passed through the imaging lens 4 or a plane parallel to the plane and a plane perpendicular to the optical axis of the imaging lens 4 as the rotation axis. There is a device that rotates vJ at a low speed, preferably a reflective surface 1.
The reflection position of the light beam 2 on 0a coincides with the rotation axis. Note that the rotation axis of the sub-scanning mirror 10 may be located at a position slightly offset from the above-mentioned reflection position within a range that does not cause a problem with the scanning accuracy of the light beam, such as the center position in the thickness direction of the mirror. .

This sub-scanning mirror 10 has a predetermined angle that is sufficient for the light beam 2 to scan the entire recording medium 5 in the direction of the arrow C while recording image information on one recording medium 5. By rotating the DI scanning mirror 10, the main scanning line formed by the light beam 2 on the recording medium 5 is gradually moved in the direction of the arrow, thereby performing sub-scanning. It will be done. Therefore, the light beam 2 is caused to two-dimensionally scan the recording medium 5 by the rotating polygon mirror 3 and the sub-scanning mirror 10.

When the sub-scanning mirror 10 rotates GJ at a predetermined speed and a predetermined angle as described in -1-, and the necessary image information is recorded over the entire surface of the recording medium, the sub-scanning mirror 10 rotates at a predetermined angle. The recording medium is rotated in the opposite direction to the rotation direction, or further rotated in the rotation direction to complete one rotation, and returned to the initial position in preparation for recording on the next recording medium.

As described above, in the apparatus of the present invention, sub-scanning is performed by fixing the recording body 5 and moving the light beam 2 by rotating the n1 scanning mirror 10, so that the recording body 5 side is moved. The size of the apparatus in the sub-scanning direction can be reduced to half the size of the apparatus compared to the case where the apparatus is made smaller. Further, even in the case where the sub-scanning mirror 10 is a long one extending in the main scanning direction as in the actual M mode, the length of the sub-scanning mirror 10 in the main scanning direction is It is sufficient that the length is sufficient to correct the image, and it is sufficient that it is shorter than the length of one scanning line on the recording medium 5. Therefore, even if the scanning mirror 10 and the motor 9 are combined, It is fully possible to make the length shorter than the length of the recording medium holding means 11 in the main scanning direction, and the length of the present invention)! The i position is also compact in the main scanning direction. Note that the sub-scanning mirror 10 does not necessarily have to be long if it can be placed sufficiently close to the main-scanning optical deflector, and its shape can also be rotated around the above-mentioned rotation axis. It may have any shape as long as it moves and allows the light beam 2 to be incident without exception.

Furthermore, since the motor 9 that drives the sub-scanning mirror 10 does not undergo load fluctuations, it is easy to control, and a relatively inexpensive motor can be used. Note that due to the returning order of the recording bodies, the recording body 5 is placed on the holding surface 11a of the recording body holding means 11.
If it is difficult to maintain the recording medium 5 in an arcuate shape, a suction means may be provided in the recording medium holding means 11 to suction the recording medium 5 onto the holding surface 11a.

Furthermore, in the apparatus of the present invention, as described above, since the sub-scanning mirror 10 is provided which allows the entire optical beam 2 deflected by the rotating polygon mirror 3 to enter, a relay lens etc. for adjusting the optical path of the optical beam 2 is provided. There is no need to provide an optical system, which simplifies the optical system, making the device more compact and reducing its manufacturing cost.

By the way, in the apparatus of the actual M mode as described above, since the recording medium 5 is scanned by the light beam 2 while being held on the holding surface 11a''- of the recording medium holding means 11, the recording medium 5
It is possible to perform recording with the light beam 2 from a desired position in the sub-scanning direction, such as the edge in the DI scanning direction. However, in order to always perform accurate recording from the edge of the recording medium 5, for example, scanning by the light beam 2 modulated by the modulator 6 is required at the position where the light beam 2 enters the edge of the recording medium 5. , i.e. the substantive recording must begin strictly. Therefore, in the apparatus of the above embodiment, the holding surface t1a is formed of a material having a different reflectance of the light beam 2 from the surface of the recording medium 5, and the holding surface t1a is formed of a material that has a different reflectance for the light beam 2 from the surface of the recording medium 5. , holding surface 11a
A photodetector 12 is provided to detect the reflected light from the light beam 2, and the photodetector 12 detects the reflected light to control the start of recording by the light beam 2.Hereinafter, the first Control of a light beam using this photodetector 12 will be explained with reference to the drawings below.

Prior to scanning with the light beam 2, the recording medium 5 is first carried onto the recording medium holding means 11, and then positioned at a predetermined position on the holding surface 11a. Figure 2 (a) to (e)
2 is a schematic diagram showing an example of loading/unloading of the recording medium.

A pair of carry-in rollers 13Δ and 13B for carrying in the record body 5 are provided near one end of the record body holding means 11. These carry-in rollers 13A, 13B are used to carry out recording bodies 5 after they are sucked one by one by the suction means 1G from a magazine 14 in which a plurality of recording bodies 5 are stored, as shown in FIG. , grips the recording medium 5 that falls while being guided by the guide plate 15, rotates in the direction of the arrow, and carries the recording medium 5 along the holding surface 11a.

The carry-in rollers 13A, 13B feed the recording medium 5 in the direction of arrow F1 by their rotation, and move the recording medium 5 to a predetermined position on the holding surface 11a where the recording medium 5 is to be held, as shown in FIG. 2(b). Transport it to the front.

The recording medium 5 thus conveyed to the front of the predetermined position is
The recording medium holding means 11 is moved to a predetermined position by a recording medium feeding plate 19 which is provided near one end and is fixed to a rotating shaft 18 which is rotationally driven by a motor 17 as shown in FIG. That is, when the recording medium 5 is being carried onto the holding surface 11a by the carrying-in rollers 13A and 13B as shown in FIG. However, the recording body 5 is held on the holding surface 11 by the carry-in rollers 13A, 133.
When it is carried in just before the predetermined position on the recording medium 5, it rotates in the direction of the arrow E1 and moves to a position where it comes into contact with the rear end of the recording medium 5, as shown in FIG. 2(b). Next, this recording medium feeding plate 19
further rotates in the direction of the force indicated by the arrow Ex as shown in FIG.
direction to the specified position.

The recording body holding means 11 is provided with a recording body detection N20 such as a reflective photointerrupter and a limit switch at a portion where the leading end of the recording body 5 is located at the predetermined position. The leading edge of the recording medium 5 pushed by the recording medium delivery plate 19 to a predetermined position is detected and a detection signal is generated. This detection signal is transmitted to the driving member of the recording medium sending-out plate 19, and the rotation of the recording medium sending-out plate 19 in the direction of arrow E2 is stopped. When the recording medium 5 is placed at a predetermined position on the holding surface 11a in this way,
As shown in FIG. 2(d), the recording medium sending plate 19 retreats slightly in the direction of arrow E3 to prepare for scanning by the light beam 2. Note that the position where the recording medium detection B20 is provided is limited to the above-mentioned position. Instead, for example, a detector is provided at a portion of the recording body holding means 11 where the rear end of the recording body 5 is located at a predetermined position where the recording body 5 is held. Alternatively, the stop 1 positioning of the recording body 5 at a predetermined position may be performed by detecting the following:
It is not necessarily necessary to use the recording body detector 20,
For example, the motor 1 that drives the recording medium delivery plate 19
The operating time of step 7 may be determined appropriately so that the recorder feed-out plate 19 is stopped at a position where the recorder 5 is moved to a predetermined position. In this case, if a pulse motor is used as the motor 17, control can be easily performed.

Furthermore, the means for avoiding the movement of the recording medium 5 is not limited to the recording medium sending plate 19 described above, and the holding surface 1 of the recording medium 5
Any means can be used as long as it can control movement on 1a and stop at a predetermined position.

As shown in FIG. 1, when the recording medium 5 is placed at a predetermined recording position, a guide plate 22 provided at the side end of the recording medium holding means 11 rotates in the direction of the arrow. By providing the width shifting plate 23 that presses the recording medium 5, the positioning of the recording medium 5 in the main scanning direction can also be performed with high precision.

When the recording medium 5 is stopped at a predetermined position on the holding surface 11a as described above, the recording apparatus starts two-dimensional scanning with the bias beam 2. As described above, the scanning position of the light beam 2 in the sub-scanning direction changes depending on the direction of the reflective surface 10a of the sub-scanning mirror 10.
>, the Y1 scanning mirror 10 scans the light beam 2.
However, the initial position is set so that scanning starts from the outer edge in the 01 scanning direction of the recording medium 5 placed at a predetermined position, and the light beam 2 is modulated by the modulator 6 described above. The recording medium 5 is moved in the sub-scanning direction toward the recording medium 5 by rotation of the sub-scanning mirror 10 while main-scanning on the holding surface 11a.

As mentioned above, f? of the recording body 5? A photodetector 12 for detecting the reflected light of the light beam 2 from the holding surface 11a is provided above the edge in the J scanning direction. While scanning the holding surface 11a without reaching the edge, a certain amount of reflected light enters the holding surface 11a and is reflected. On the other hand, as described above, the surface of the recording medium 5 and the holding surface 11a have different reflectances for the light beam, and as shown in FIG. 5, the reflected light of the light beam emitted from the holding surface 11a side changes.

The photodetector 12 detects a change in this reflected light and generates a detection signal S, which is sent to the image signal output circuit 8 as a recording start signal. The image signal output circuit 8 starts outputting an image signal in response to this recording start signal S. In this way, almost at the same time that the light beam 2 reaches the edge of the recording medium 5, the modulator 6 driven by the front variable wA device drive circuit 7 emits light based on the signal emitted from the image signal horn circuit 8. Since the beam 2 is modulated, the recording medium 5 starts to be substantially recorded by the modulated light beam 2 from its edge, and as shown in FIG. Recording is performed using a beam.

According to the recording apparatus equipped with the photodetector 12 as described above, in addition to being able to perform recording from the edge of the recording medium 5 without waste as described above, the light beam 2 emitted by the photodetector 12 can be
A certain time difference is set between detecting a change in the reflected light of the image signal output circuit 8 and driving the image signal output circuit 8.
An edge of a predetermined width is formed by scanning the unmodulated light beam 2, and then scanning the modulated light beam 2.
It is also possible to perform recording using The photodetector 12 is located at one of the edges of the recording medium 5 in the sub-scanning direction, and can detect changes in the reflected light of the light beam 2 that has reached the edge of the recording medium 5. It may be any position as long as it is a position. Furthermore, the recording medium 5 is always held on the holding surface 11.
It does not need to be located exactly at the same position on a,
As long as the photodetector 12 can detect changes in the reflected light when the light beam 2 approaches the edge of the recording medium 5, the holding position on the holding surface 11a for each recording medium is δ It doesn't matter if they are different. In any case, with the apparatus of the present invention, substantial recording can be accurately started from a desired position such as the edge of the recording medium, so that the recording medium can be efficiently and accurately positioned on the recording medium. You can get the image.

As described above, when the recording by the light beam 2 is completed, the recording medium delivery plate 19 rotates in the direction of the arrow E4 and pushes the leading end of the recording medium 5, as shown in FIG. is moved to the other end side of the recording medium holding means 11. Near the other end of the recording medium holding means 11, a pair of delivery rollers 21A is provided as a means for transporting the recording medium 5.

21B is provided, and the recording medium delivery plate 19 pushes and moves the rear end of the recording medium 5 until the leading end of the recording medium is gripped by the conveyance rollers 21A and 21B. The recording medium 5 gripped by the carry-out rollers 21A, 21B in this manner is moved in the direction of arrow F by the rotation of the carry-out rollers 21A, 21B, and is carried out to the outside of the recording apparatus. The recording medium 5 carried out from the apparatus is carried into, for example, an automatic developing machine or a receiving magazine, and the carrying out rollers 21A and 21B may also serve as entrance rollers of the automatic developing machine.

When the recording medium 5 is carried out of the apparatus in this way, the recording medium feeding plate 19 moves in the direction of the arrow E5, which is the opposite direction to the arrow E4 direction.
The second recording medium 5 is rotated in the direction and the second
Return to the position shown in the figure (a>).

Further, the positioning of the recording medium on the holding surface 11a in the sub-scanning direction can also be performed using a member other than the aforementioned recording medium feeding plate 19. For example, as shown in FIG. a first position extending in the scanning direction, the top end of which is on the holding surface; and a second position, the top end of which is retracted from the holding surface.
It is also possible to provide a recording body feed roller 25 that can take the position , and to position the recording body 5 by this feed roller 25 .

The light beam scanning device of the present invention has been described above using a light beam recording device as an example. Information recording and reproducing system (Unexamined Japanese Patent Publication No. 55-1
No. 2429, No. 5G-11395.

5G-11397, etc.), it can be applied to various light beam reading devices such as radiographic image information reading neck devices, etc., and the above-mentioned effects can be achieved in the same way in light beam reading devices. It is something that can be done. In this case, the reading means may be moved on the scanning sheet opposite to the scanning line in conjunction with the rotation of the sub-scanning mirror.

Here, the signal emitted from the photodetector 12 becomes a reading start signal and is sent to a photodetector such as a photomultiplier that constitutes a part of the reading means, and the reading start signal activates the photodetector. The start of reading the image information may be controlled by starting the image information. Furthermore, without separately providing the photodetector 12, the photodetector of the reading means may be activated at the same time as the light beam scan starts, and the edge of the sheet may be detected by this detector.

(Effect of Screaming) As explained in detail above, according to the light beam scanning device of the present invention, by fixing the scanning sheet and performing 111 scans, the entire am can be downsized, especially in the sub-scanning direction. I can do it. Furthermore, by performing sub-scanning with a sub-scanning reflection mirror and by making the scanning sheet into an arcuate shape, the S
The optical system in the i-station can be simplified, and the entire device can be further miniaturized. In addition, the number of optical elements used can be reduced and the need for expensive optical elements can be eliminated, and the sub-scanning motor can be made inexpensive, so the manufacturing cost of the device can be greatly reduced. .

Further, in the apparatus of the present invention, the scanning sheet 1- and the holding surface are made of materials having different light beam reflectances, and a photodetector detects changes in the reflected light to read or record information.
71 By emitting a start signal, it is possible to accurately control the reading or recording start position of the light beam on the scanning sheet, and it is possible to perform regular scanning in which substantial scanning can be performed from the beginning of the scanning sheet. The scanning position vJ on the sheet can be raised.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an outline of a light beam recording device according to an embodiment of the present invention, and FIGS. 2(a) to (e) show loading of a recording medium into the device,
A schematic diagram illustrating an example of unloading and positioning; Figures 3(a) to (C) are schematic diagrams illustrating the function of the photodetector of the arrangement device; FIGS. 5 and 6 are perspective views showing an outline of a conventional light beam scanning device. FIGS. 1... Beam light source 2... Light beam 3...
Rotating polygon mirror 4... Imaging lens 5... Recording body 10... Sub-scanning mirror 11... Recording body holding means 12... Photodetector 3

Claims (1)

[Claims] A light beam emitted from a beam source is caused to scan a scanning sheet in a main scanning direction, and the light beam and the scanning sheet are relatively moved in a sub-scanning direction substantially orthogonal to the main scanning direction. A light beam scanning device that performs reading or recording by scanning the light beam two-dimensionally on the scanning sheet by moving the light beam, the light beam scanning device being provided on the optical path of the light beam emitted from the beam light source, an imaging lens provided on the optical path of the light beam deflected by the main scanning optical deflector; an imaging lens provided on the optical path of the light beam that passed through the imaging lens; A mirror that reflects the light beam with a reflective surface, which has a plane containing the optical path of the light beam that has passed through the imaging lens or a plane parallel to the plane, and a plane perpendicular to the optical axis of the imaging lens. A sub-scanning mirror that rotates about an intersection line as a rotation axis, and a scanning sheet holding means that holds the scanning sheet in an arcuate shape having a central axis that substantially coincides with the rotation axis of the sub-scanning mirror. , the surface of the scanning sheet and the scanning sheet holding surface of the scanning sheet holding means are formed of materials having different reflectances for the light beam, and the edge of the scanning sheet held on the holding surface in the sub-scanning direction is A light beam scanning device characterized in that a photodetector is provided above to detect light reflected from the holding surface.