JPS6292574A - Light beam scanning device - Google Patents

Abstract

PURPOSE:To miniaturize the titled device in the sub-scanning direction and to facilitate the control of a shifting motor by turning sheet holding means with use of a straight lien almost parallel to the main scanning line near the scanning sheet holding surface as the center. CONSTITUTION:A light beam 2 reflected and deflected by a rotating polygon mirror 3 is made incident on a mirror 10 for the sub-scanning through an image- forming lens 4, a reflecting light beam 2 by the mirror 10 is image-formed to an image-forming position P1 of the lens 4 and a conjugate position P2 and a scanning sheet 5 is held on the plane formed by the locus of the position P2. While the mirror 10 records the picture information to the sheet 5, the light beam 2 is linearly shifted to the scannable range S only in the light axis direction C of the lens 4, and the main scanning line formed on the sheet 5 by the beam 2 is shifted in the D direction and the sub-scanning is executed. The sheet 5 is supported by a holding means 11 having a holding surface 11a of the prescribed angle concerning the beam 2 made incident on by the special relation with the mirror 10, and the means 11 is turned by the turning means composed of a motor 18 and an engaging groove 21.

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, and more particularly, to miniaturization of the entire device,
The present invention relates to a light beam scanning device that can reduce costs.

(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 in various scanning recording devices and scanning reading devices. It is widely used in 33 countries. Two-dimensional scanning of the light beam in these light beam scanning devices involves deflecting the light beam with an optical deflector to perform main scanning on the scanning sheet, and moving the light beam and the scanning sheet relative to each other in the main scanning direction. This is done by moving in the sub-scanning direction which is substantially orthogonal to the .

However, in the conventional apparatus, a problem arises in that the means for performing the above-mentioned FXIJ scan makes the apparatus large and expensive. Hereinafter, the problems of the conventional light beam scanning device will be explained with reference to FIG.

In the light beam scanning device shown in FIG.
A light beam 102 emitted from 01 is incident on a rotating polygon mirror 103, which is an optical deflector, and is reflected and deflected as the rotating polygon mirror 103 rotates in the six directions of arrows. Rotating polygon &
? ! The light beam 102 reflected by the light beam 103 passes through an fθ lens 104, which is an imaging lens, provided on the optical path, and then main-scans the scanning sheet 105 in the direction of arrow B. The scanning sheet 105 is held in the main scanning direction as the rotating drum 106 rotates while being held between a rotating drum 106 rotating in the direction of arrow C and a pair of rollers 107A and 107B provided on the rotating drum 106. The sub-scanning is carried out by being conveyed in the direction of the arrow, which is substantially perpendicular to the arrow. Therefore, the light beam 102 is directed to the scanning sheet that is conveyed (sub-scanned) in the direction of the arrow.
The sheet 105 is two-dimensionally scanned by repeatedly main-scanning the sheet 105 in the direction of arrow B.
Image information is recorded over substantially the entire surface of 05.

However, in the above-mentioned apparatus, sub-scanning is performed by moving the scanning sheet 105, but in order to suppress load fluctuations on the motor 108 during sub-scanning as much as possible to prevent sub-scanning unevenness, as shown in the figure. It is necessary to provide a space in which one scanning sheet can be placed, such as by placing support stands 109 and 110 that support the scanning sheet 105 before and after the scanning position by the light beam 102, as shown in FIG. For this reason, the above-mentioned apparatus requires a space having a length of two or more 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 105 in order to stably convey the scanning sheet, and a motor 108 that rotates the rotating drum 106 is provided. is further provided in the width direction of the rotating drum 106, so the above-mentioned device also becomes large in the main scanning direction.

While roughly conveying the scanning sheet 105,
In order to perform high-precision scanning on 105, the scanning sheet
It is necessary to strictly control the motor 108 so that the motor 105 can be transported at a constant speed in the correct direction with high precision, and since a high-precision motor that can perform the above control is expensive, the entire device There is also the problem that the cost will increase significantly. Furthermore, the rollers 107A and 107B are essential in order to stably convey the scanning sheet 105;
3, it is not possible to scan both ends of the scanning sheet 105 in the sub-scanning direction, and when the apparatus is a light beam recording device, it is possible to meet the demand for black edges at both ends. There is also the inconvenience of not being able to do so.

(Objective of the Invention) The present invention has been made in view of the above-mentioned problems, and solves the problems of increasing the size of Ejl and increasing manufacturing costs caused by moving the scanning sheet and performing sub-scanning. The object of the present invention is to provide a compact and inexpensive light beam scanning device.

(Structure of the Invention) The light beam scanning device of the present invention includes a main scanning optical deflector that is provided on the optical path of the light beam emitted from the beam light source and deflects the light beam, and the main scanning optical deflector. An imaging lens that is provided on the optical path of the light beam deflected by the device and is capable of focusing the light beam on a predetermined straight line; an elongated sub-scanning mirror that extends in the scanning direction, is provided at an angle with respect to the optical path of the light beam, and is movable in the optical axis direction of the imaging lens; and a mirror of the sub-scanning mirror. Holding the scanning sheet on a plane formed by a straight line trajectory located at a position conjugate with the straight line on which the light beam is imaged with respect to the sub-scanning mirror, which moves with the movement in the optical axis direction. The first feature of the present invention is that it includes a scanning sheet holding means for holding the scanning sheet.

That is, in the light beam scanning device of the present invention, the light beam deflected in the main scanning direction is reflected by the sub-scanning mirror and incident on the scanning sheet, and sub-scanning is performed by moving the sub-scanning mirror. Since the scanning sheet is fixed by the scanning sheet holding means, there is no need to make the device large in the sub-scanning direction, unlike when carrying the scanning sheet for sub-scanning, making the entire device compact. be able to. Further, the motor for moving the sub-scanning mirror for sub-scanning does not undergo load fluctuations unlike when conveying a scanning sheet, so it is easy to control, and a relatively inexpensive motor can be used.
The manufacturing cost of the device can be reduced.

By the way, in the light beam scanning device of the present invention, the scanning sheet is held on the above-mentioned specific plane by the scanning sheet holding means and is subjected to two-dimensional scanning by the light beam. Prior to scanning, the sheet needs to be carried onto the scanning sheet holding surface of the scanning sheet holding means, and it needs to be carried out from the sheet holding means before the scanning of the light beam is completed. The scanning sheets may be carried into the sheet holding means as described above by taking out the sheets as appropriate from a plurality of magazines each containing a plurality of scanning sheets of different sizes. The scanned sheets to be carried out are stored in different receive magazines depending on their size, or if the scanning device is a recording device, some scanned sheets are transported to an automated machine, and some scanned sheets are transported to an automated machine. Depending on the sheet, the treatment after unloading may differ, such as once being accumulated in a receive magazine. Therefore, if the scanning sheet holding means is movable so that it is easy to carry in and/or take out the scanning sheet depending on the type of scanning sheet, it is possible to arrange a plurality of magazines, receive magazines, etc. in the vicinity of the scanning sheet holding means at the same time. This makes it possible to efficiently carry in and/or carry out scanning sheets. Therefore, the second feature of the apparatus of the present invention is that it includes a rotating means for rotating the scanning sheet holding means about a straight line substantially parallel to the main scanning line near the scanning sheet 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.

A light beam 2 emitted from a laser light source 1 is modulated by a modulator 6 which is modulated by a modulator drive circuit 7 based on a signal emitted from an image signal output circuit 8 that outputs an image signal. , and is deflected by the rotating polygon mirror 3, which is a main scanning optical deflector that rotates in the direction of the arrow. As the laser light source 1, @e-Ne laser, ArL/-IJ
For e in W, a laser light source or the like is used, which is a combination of a semiconductor laser and a beam shaping optical system. Furthermore, when using a laser light source capable of direct modulation such as a 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. You can also do it. In addition to the rotating polygon mirror described above, other types of optical deflectors such as a galvanometer mirror and an acousto-optic optical deflector (AOD) may be used as the optical deflector for one scanning.

The light beam 2 deflected by the rotating polygon mirror 3 has an optical path -
After passing through an imaging lens 4 such as an fθ lens provided at
The light enters and is reflected by the reflective surface 10a of the elongated sub-scanning mirror 10 extending in the main scanning direction, which moves linearly in the direction of arrow C, which is the optical axis direction.

Further, below the sub-scanning mirror 10, on the optical path of the light beam reflected by the sub-scanning mirror 10, a sheet-like recording material (scanning sheet) 5 such as photographic film or photographic paper is placed. As will be described in detail, it is supported by a recording medium holding means 11 having a holding surface 11a that is inclined at a predetermined angle with respect to the incident light beam 2 so as to have a specific relationship with the sub-scanning mirror 10.

This holding means 11 is formed, for example, by processing a plate-like object or by integrally molding a synthetic resin or the like.

When the recording medium 5 is held on the recording medium holding means 11 as described above, the light beam 2 is 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 causes the light beam deflected by the rotating polygon mirror 3 to scan at approximately constant angular velocity on the flat recording medium 5, L. It's a lens. Further, in the illustrated recording apparatus, sub-scanning is performed by moving a sub-scanning mirror 10 with respect to the recording medium 5. Next, referring to FIG. 2 which is a conceptual side view of the apparatus shown in FIG.
The relationship between 0 and the recording medium 5 and the mechanism of sub-scanning will be explained.

The light beam 2 reflected and deflected by the rotating polygon mirror 3 passes through the imaging lens 4 provided on the optical path, as described above. This imaging lens 4 is capable of focusing the incident light beam on a predetermined imaging position Pl located on a straight line perpendicular to the paper surface of FIG. As described above, a long sub-scanning mirror 10 is provided on the optical path of the light beam that has passed through the imaging lens 4, and this W1 scanning mirror 1
0 is provided to be inclined with respect to the optical path of the light beam 2 so that the light beam is incident on the reflecting surface 10a at an incident angle α, and the light beam 2 is reflected downward by the sub-scanning mirror 1o. The light beam 2 reflected by the sub-scanning mirror 10 forms an image at an imaging position 1iff P 2 that is conjugate with the imaging position PI with respect to the sub-scanning mirror 10 . The imaging position P2 of the optical beam 2 reflected by the D1 scanning mirror 10 is located at the arrow C of the sub-scanning mirror 10.
The image forming position L? of the recording medium 5 is located at a position conjugate with the image forming position P1 with respect to the 01 scanning mirror 10, which changes due to the movement of the sub-scanning mirror 10. It is held on the plane formed by the locus of j P 2.

That is, the recording body 5 includes the focal point P1 of the light beam 2, and is set at an angle α equal to the incident angle α of the light beam on the DI scanning mirror, or at a plane tilted with respect to the incident light beam 2. The recording medium 5 is placed on this plane at a position that allows the light beam 2 reflected by the sub-scanning mirror 10 to be incident thereon.

As described above, the sub-scanning mirror 10 moves along the arrow C while recording image information on one recording medium 5.
direction, the sub-scanning mirror 10 gradually moves linearly by a range S sufficient for the light beam 2 to scan the entire surface of the recording medium.
Due to this movement, 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.

Therefore, the light beam 2 is caused to two-dimensionally scan the entire surface of the recording medium by the rotating polygon mirror 3 and the sub-scanning mirror 10.

The movement of the sub-scanning mirror 10 is performed by a pair of pulleys 12A, 12B rotated by a motor 9, and a pair of driven pulleys 13Δ, as shown in FIG.
, 13B and moves along with the rotation of the pulleys 12A, 12B, a mirror support member 158 connected to the wires 14 provided at both ends of the sub-scanning mirror moves on the guide rail 15b. This is done by Note that the movement of the sub-scanning mirror 10 can be performed by various means depending on the requirements of the device configuration, such as movement using a linear motor, in addition to the drive of the WV as described above.

As described above, when the sub-scanning mirror 10 moves within a predetermined range at a predetermined speed and the necessary image information is recorded over the entire surface of the recording medium, the sub-scanning mirror 10 moves in the opposite direction to the moving direction. direction and returned to the initial position in preparation for recording on the next recording medium.

In this embodiment, as shown in FIG. 1, a photodetector 16 is mounted on the recording medium holding means 11, and this photodetector 16 is mounted on the recording medium holding means 11. ! The light beam 2 is detected by l116, and the image recording scan start position is determined.

At the same time, the sub-scanning mirror 10 is moved from the initial position in the direction of arrow C to detect that the light beam has reached the end of the recording medium 5, and at this point the light modulator 6 is activated based on the image signal. Then, the light beam 2 is modulated and image recording on the recording medium 5 is started.

As described above, in the apparatus J3 of the present invention, sub-scanning is performed by fixing the recording medium 5 and moving the sub-scanning mirror 10 to move the light beam 2, so that the recording medium side is Compared to the case where the device is moved, the size of the device in the sub-scanning direction can be reduced to less than half. Further, the length of the sub-scanning mirror 10 in the main scanning direction is sufficient as long as it is long enough to allow the incidence of the light beam, and it is sufficient that it is shorter than the length of the main scanning line on the recording medium. Therefore, even if the sub-scanning mirror 10 and the mirror moving means are busy, it is possible to make the length shorter than the length of the recording medium holding means 11 in the main scanning direction. It is also compact in the main scanning direction. In addition, m1 scanning mirror 1
Since the motor 9 that drives the motor 0 does not undergo load fluctuations, it is easy to control, and a relatively inexpensive motor can be used. Further, since the recording medium 5 held by the sheet holding means 11 can be irradiated with a light beam from the front end to the rear end in the sub-scanning direction to perform recording on the entire surface of the recording medium, both ends of the recording medium can be covered with a black edge. (to make it black)
It is also easy to do. Note that depending on the type of recording medium, if the recording medium 5 does not fit well on the holding surface 11a of the recording medium holding means 11 and it is difficult to maintain it in a flat state,
A suction means may be provided in the recording medium holding means 11 to suction the recording medium onto the holding surface 11a.

By the way, as mentioned above, in the device of this actual flow R,
The recording medium 5 is held at a predetermined position on the obliquely inclined holding surfaces 11a and 11h by the recording medium holding means 11, and is configured to be scanned by the light beam 2.
is carried onto the holding surface 11a prior to scanning. The recording bodies carried into the above-mentioned apparatus for recording may have a plurality of sizes, and the recording bodies before being carried into the apparatus are usually housed in a plurality of magazines for each size. Therefore, in the apparatus of this embodiment, a support shaft 17 extending in the sub-scanning direction is provided at the lower end portion of the recording medium holding means 11, and the recording medium holding means 11 is positioned at a position where scanning by the light beam 2 is performed as described above. It is rotatable about the support @ 17 so that it can assume a first position (not shown by a solid line in FIG. 1) and a second position (not shown by a dashed line in the figure), Its position is changed according to the size of the recording medium carried into the means 11. The rotation of the recording medium holding means and the loading of recording bodies of different sizes will be described below with reference to FIGS. 1 and 3.

As shown in FIG. 1, an engagement groove 21 is formed in the upper part of the side surface of the recording medium holding means 11, and a circular support that is rotated in the direction of the arrow by the Tanabata 18 is provided in the engagement groove 21. An eccentric pin 20 mounted vertically on the plate 19 engages. The eccentric pin 20 moves within the engagement groove 21 by rotation of the support plate 19, and the recording medium holding means 11 is moved from the first position to the second position.

A pair of carry-in rollers 22A are provided near the upper end when the recording medium holding means 11 is in the first position.

22F3 includes a pair of carry-in rollers 23Δ near the upper end when the recording medium holding means 11 is in the second position.

23B are provided respectively. Furthermore, Fig. 3 (a
) As shown in FIG. 1, a magazine 24 containing seeds 5' with a small noise is arranged near the carry-in rollers 22A, 22B, and
A magazine 2G containing large-sized sheets 5'' is arranged near B. When the sheet to be carried into the recording medium holding means 11 and recorded is a small-sized sheet 5', In this case, as shown in FIG. 3(a), the recording medium holding means 11 is in the first position, and the sheets 5' in the magazine 24 are sucked by the suction means 25.
The sheets are separated one by one and moved so that the leading ends thereof are gripped by the carry-in rollers 22A and 22B.

The carry-in rollers 22A and 22B send the recording medium in the direction of arrow FLh by their rotation, and carry the recording body 5 along the holding surface 11a to a position just before a predetermined position on the holding surface 11a. Further, the holding surface 11a allows the recording medium 5 to fall under its own weight along the holding surface 11a, and the recording medium 5' has its rear end in the carrying direction aligned with the carrying-in roller 22A.

When separated from 22B, it falls under its own weight along the holding surface 11a.

A first position is provided at the lower end of the recording medium holding means 11, one end of which protrudes above the holding surface 11a and comes into contact with the tip of the recording medium 5' falling under its own weight, stopping the recording medium 5' at a predetermined position. For example, two sheet stop plates 28 are provided, which take the second position 1q and retreat from the holding surface 11a. Then, as shown in FIG. 3(b), the recording medium 5', which is in the first position and falls under its own weight, is stopped at a predetermined position. a3. If the recording medium 5' falls due to its own weight and becomes unstable due to the angle of the recording medium holding surface 11a with respect to the horizontal plane or wear of the holding surface +1a and the recording medium 5', there is a roller in the recording medium holding means, a recording medium feeding mechanism, etc. It is sufficient to provide a recording body moving means such as a plate to move the recording body 5' to a predetermined position.

When the recording medium 5' is held at a predetermined position on the holding surface 11a as described above, two-dimensional scanning by the light beam 2 is performed in this state as shown in FIG. 3(b').

When recording by the light beam is completed, the sheet stop plate 28 rotates in the direction of arrow G, retreats from the holding surface 11a, and moves to the second position, as shown in FIG. 3(C). 5 again falls in the direction of arrow F2 along the holding surface Ha due to its own weight. Near the lower end of the recording medium holding means 11, a pair of carry-out rollers 29△ and 29B are provided, which grip and carry out the leading edge of the recording medium 5' which falls under its own weight as described above.
The recording material that has fallen from a predetermined position due to its own weight is transferred to this unloading roller 29.
A and 29B, and as shown in FIG. 3(C), by rotating these delivery rollers 29A and 29B in the direction of the arrow, the paper is delivered to the outside of the recording apparatus. When the recording medium is carried out of the apparatus in this way, the sheet stop plate 28 moves in the direction indicated by the arrow G.
It rotates in the opposite direction and returns to the first position in preparation for carrying in a new recording medium.

When recording is to be performed on a large size recording medium 5'' after the recording on the small size recording medium 5' is completed as described above, the recording medium holding means 11 is operated by the motor 18 as described above. As shown in FIG. 3(d), the eccentric bin 20, which is displaced by the drive of The large-sized recording bodies 5'' in the magazine 2G are sucked by the suction means 27 and fed one by one, and the carry-in roller 23A rotates in the direction of the arrow in the figure.
It is moved so that it is held by 23B. The carry-in rollers 23A, 23B carry the recording medium 5'' to a position δ in front of the predetermined position on the holding surface 11a, and when the rear end of the recording body 5'' leaves the carry-in rollers 23A, 23B, the position shown in FIG.
), the seat stop plate 2 is dropped by the vehicle and the seat stop plate 2
8 and stops at a predetermined position. In this way, the recording body 5
'', the recording medium holding means 11 moves to the third position.
As shown in Figure (f), the first
The recording medium 5'' is scanned by the light beam 2 at this first position.The recording medium 5'' held on the recording medium holding means 11 at the second position is scanned by the optical beam 2. If the direction of the sub-scanning mirror 1o is changed so that the beam 2 is focused, the recording medium holding means 1
It is also possible to perform recording with No. 1 placed in the second position.

When the recording by the light beam is completed, as shown in FIG. 3 (9), the sheet stop plate 28 rotates in the direction of arrow G and reaches the second position, allowing the recording medium 5'' to fall under its own weight. The leading end of the recording body 5'' is held by the carry-out rollers 29A', 2'lB;
It is carried out of the apparatus by the rotation at 913'.

As described above, in the apparatus of this embodiment, the recording medium holding means 11 is rotatable around the support shaft 17 so that its upper end moves, so that it is difficult to carry the recording medium into the recording medium holding means 11. This can be done efficiently depending on the size of the recording medium. Note that in the above embodiment J3, the first position of the recording body holding means 11 into which the small-sized recording body is carried is the same as the position where the light beam scans.
The loading position of the small size J3 and large size recording bodies is set to a position different from the scanning position by the light beam, and after the recording bodies are loaded, the recording body holding means 11 is always moved to the scanning position to perform recording. It's okay. Also Honji 1M
In this embodiment, the rotating means for rotating the recording medium holding means 11 includes the motor 18, the support plate 19, the eccentric bin 201 and the engagement groove 2.
1, but the rotating means can also be formed using various other members. Furthermore, it goes without saying that the number of positions that the recording medium holding means can take can be arbitrarily set depending on the size of the recording medium.

When the recording medium holding means 11 is made rotatable as described above, one of the advantages is that the recording medium can be carried in efficiently, but as shown in FIG. A pivot shaft 17 for rotating the recording body holding means 11 is provided at the upper end portion of the recording body holding means 11, and the recording body holding means 11 is rotated so that the lower end of the recording body holding means 11 moves around this support shaft 17. By moving the recording medium 5, it becomes possible to carry out the recording medium 5 efficiently in accordance with the treatment to be performed after the recording medium 5 is conveyed. That is, the recording medium after recording is stored in the receive magazine 32 or sent to the automatic developing machine 33. 3OA, 30B
If it is rotated so that it can take a first position in communication with the rollers 31A and 31B that carry the recording medium 5 into the automatic developing machine 33, a specific recording medium can be preferentially developed. The recording bodies 5 can be sorted out according to the treatment to be taken after the recording is completed, and can be carried out efficiently.

Furthermore, as shown in FIG. 5, a rotating support shaft 17 may be provided in the center of the recording medium holding means 11 so that both the upper and lower ends of the recording medium holding means are movable. In this case, the position of the recording medium holding means 11 shown by the solid line in the figure is used as a reference position, and this position is used as the position for recording with the light beam 2. It may be possible to freely select the size of the recording medium to be used, the treatment of the recording medium after being carried out, etc. Note that, even if the position of the support shaft 17 is not the position shown in each of the embodiments described above, if it is on a straight line substantially parallel to the main scanning line near the recording medium holding surface 11a, the rotation of the recording medium holding means 11 can be controlled by υj. It can be set at any suitable position.

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. 56-11395.

It can also be applied to various light beam reading devices such as the radiation image information reading device used in Japanese Patent No. 56-11397, etc.), and the above-mentioned effects can be achieved in the same way in light beam reading devices. It is possible. In this case, in conjunction with the movement of the sub-scanning mirror, a reading means having a photodetector for detecting reflected light, transmitted light, 1 emitted light, etc. from the scanning sheet is placed opposite to the scanning line on the scanning sheet. Just move it.

(Effects of the Invention) As explained above, according to the light beam scanning device of the present invention, by performing sub-scanning with the scanning sheet fixed,
The entire device can be downsized, especially in the sub-scanning direction.

In addition, the motor that moves the sub-scanning mirror in the sub-scanning direction is easy to control because there is no load fluctuation, and is cheaper than the motor used to move the scanning sheet side. Can the whole device 'IJ 7
5 Costs are reduced.

In general, the apparatus of the present invention has the scanning sheet holding means rotatable, so that the scanning sheets are carried into and/or out of the recording medium holding means in a manner that is divided according to the scanning sheet. Loading/unloading can be carried out efficiently.

[Brief explanation of drawings]

Figure 1 is a fruit of the present invention/Il! FIG. 2 is a conceptual side view of FIG. 1 illustrating sub-scanning in the above device; FIGS. 3(a) to 3(g) are 5A shown in FIG. 1; 4 and 5 are schematic diagrams illustrating the rotation of the recording body holding means in another embodiment of the present invention, and FIG. 6 is a schematic diagram illustrating the rotation of the recording body holding means in another embodiment of the present invention. FIG. 2 is a perspective view without showing the outline of a light beam scanning device. 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 11a... Holding surface 17... Support
Shaft 18...Motor 20...Eccentric bin
21...Engagement groove Fig. 2

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. In the light beam scanning device that moves the light beam to two-dimensionally scan the light beam on the scanning sheet, the main scanning device is provided on the optical path of the light beam emitted from the beam source and deflects the light beam. a light deflector; an imaging lens that is provided on the optical path of the light beam deflected by the main scanning light deflector and is capable of focusing the light beam on a predetermined straight line; a light beam that passes through the imaging lens; an elongated sub-scan that is disposed on the optical path of the light beam, extends in the main scanning direction, is inclined with respect to the optical path of the light beam, and is movable in the optical axis direction of the imaging lens; and a linear locus that moves as the sub-scanning mirror moves in the optical axis direction and is located at a position conjugate with the straight line on which the light beam is imaged with respect to the sub-scanning mirror. A scanning sheet holding means capable of holding the scanning sheet is provided on a plane, and the scanning sheet holding means is rotated about a straight line substantially parallel to the main scanning line near the scanning sheet holding surface of the scanning sheet holding means. A light beam scanning device characterized by having a rotating means for moving the light beam.