JPH071372B2 - Optical scanning device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an optical scanning device, and more particularly to an optical scanning device applicable to a slit exposure type copying machine, a facsimile, and the like.

2. Description of the Related Art As a conventional optical device of this type, one shown in FIG. 1 is known. According to this, the code in the figure
Reference numerals 1 and 2 denote scanners, and mirrors (not shown) are attached to the scanners 1 and 2, respectively. The scanners 1 and 2 are arranged in parallel with each other at both ends and are arranged side by side in the axial direction of the guide rods 3 and 4 as “guide members” and are movable in that direction. Here, one of the scanners 1 is a bracket extending at both ends.
It is adapted to be connected to wires 9 and 10 via clamps 7 and 8 attached to 5 and 6, respectively. The other scanner 2 is connected to the wires 9 and 10 via a pulley 12 pivotally supported by a bracket 11 extending at one end and a pulley 14 pivotally supported by a guide portion 13. There is.

The wire 9 is a clamp whose one end is a fixing part of the apparatus main body.
The extension of one end of the tension pulley 22 is wound around the fixed pulleys 15, 16, 17, and 18 after the pulley 12 is wound around half and the tension pulley 22 is wound around the pulley 12 again after half wound around. The end of the wire, that is, the other end of the wire 9 is wound around the clamp 24 and forms a first fixing portion together with the clamp 23.
It is fixed to. Further, the other wire 10 has one end fixed to a clamp 28 which is a fixing portion of the apparatus main body, and an extension portion of this one end is wound around the pulley 14 half-turned and then wound around the fixed pulleys 16 and 17. At the same time, the pulley 14 is half-wound again and then wound around the tension pulley 27, and the terminal end thereof, that is, the other end of the wire 10 is fixed together with the clamp 28 to the clamp 29 which constitutes the second fixing portion. On the other hand, the wires 9 and 10 are wound around the shaft 19a of the drive motor 19 between the pulleys 16 and 17 by an appropriate number of times, and as a result, the wires 9 and 10 are transferred by the drive motor 19 in a predetermined direction. It is like this. Further, since the tension pulleys 22 and 27 are provided with springs 21 and 26, respectively, a predetermined tension is constantly applied to the wires 9 and 10.

In this way, the scanners 1 and 2 move synchronously in the axial direction of the guide rods 3 and 4, that is, in the direction orthogonal to the axes of the pulleys 12 and 14 by the rotation of the motor 19, and the moving speed of one of the scanners 1 is higher. The speed is twice as fast as that of the other scanner 2. In addition, reference numerals 30 and 31 denote rolling rollers rollingly contacting the guide rod 4, and the rolling rollers 30 and 31 are attached to the brackets 5 and 11, respectively.

However, according to such a conventional so-called double-sided drive type optical scanning device, the difference in tension acting on each wire 9 and 10, the variation in the length of each wire 9 and 10, each pulley 1
Each pulley 12,14 may be
Is likely to be displaced, and as a result, a twisting force is applied to the scanner 2. Therefore, the positional accuracy of the mirror surface attached to the scanner 2 is apparently deteriorated, and the optical axis of the slit exposure optical system is deviated, or the guide portion 13 which is inserted through the guide rod 3 interferes with the guide rod 3. However, there is a problem in that the so-called biting is caused to prevent smooth movement of the scanner 2.

Configuration An embodiment according to the first, second and third aspects of the present invention will be described below with reference to the drawings.

The same or equivalent components as those used in the description of the prior art are designated by the same reference numerals, and the duplicated description will be omitted. FIG. 2 shows an embodiment according to the first aspect of the present invention, in which a bracket 11 is provided with a slide member 32 as a “movable member” bent in a crank shape, and the pulley 12 is attached to the slide member 32. Is supported. Here, elongated holes 33, 34 are formed at both ends of the slide member 32, and screws 35, 36 are inserted into the elongated holes 33, 32 to attach the slide member 32 to the bracket 11 and slide member 32. Is slidable in the longitudinal direction of the long holes 33, 34, that is, in the moving direction of the scanner 2. Incidentally, such a slide member 32 may be attached to either one of the two pulleys 12 and 14.

With this structure, when the pulleys 12 and 14 are displaced after tension is applied to the pulleys 9 and 10 by the tension pulleys 22 and 27 during assembly of the device, the screws 35 and 36 should be tightened. By loosening, the slide member 32 is adjusted to correct its position and the screws 35 and 36 are tightened again.

FIG. 3 shows an embodiment according to the second invention of the present invention, in which both ends 9a, 9b of one wire 9 have a movable structure. That is, the shaft 37 is fixed to a predetermined position, the wire adjusting pulley 38 is attached to the shaft 37, and the boss 39 of the wire adjusting pulley 38 is connected to the shaft 37 so that the rotation angle position of the wire adjusting pulley 38 is increased. "Fixing means"
While providing the fastening screw 40 as a
Both ends 9a, 9b of the wire 9 are fixed to both ends of the diametrical direction 38, respectively. Other configurations are similar to those of the first invention.

With this configuration, when the tension is applied to the wire 9 by the tension pulley 22 during the assembly of the device and the pulleys 12 and 14 are displaced, the fastening screw 40
By loosening, the connection between the shaft 37 and the wire adjusting pulley 38 is released, and the wire adjusting pulley 38 is rotated to a predetermined balanced state. In other words, this wire adjustment pulley 38
The rotation of the wire 9 moves the wire 9 in the extension direction of the wire 9 (the direction of arrow P in FIG. 1), and the twisted state of the scanner 2 is avoided. In this way, when the balance state is secured, the fastening screw 40 is tightened again to connect the wire adjusting pulley 38 to the shaft 37.

FIG. 4 shows an embodiment of the third invention, and similarly to the above-mentioned case, the wire 9 is attached to one end of the movable plate 41 as the “dwarf and adjusting member” which constitutes the first fixed portion. One end 9a of the wire 9 is fixed, and the other end 9b of the wire 9 is fixed to the other end of the movable plate 41 via a fixed pulley 42 pivotally supported at a predetermined position. Movable plate here
An elongated hole 43 having a lengthwise direction extending in the extension direction of the wire 9 is bored in a substantially central portion of the 41, and two fastening screws are formed in the elongated hole 43.
44 and 45 are inserted so that the movable plate 41 can be fixed at an appropriate position. Other configurations are similar to those of the first invention.

With this configuration, if the pulleys 12 and 14 are displaced after tension is applied to the wires 9 and 10 by the tension pulleys 22 and 27 during assembly of the device, the fastening screws 44 and 45 should be tightened. By loosening, the movable plate 41 is balanced at an appropriate position, and then the fastening screws 44, 45 are tightened again. That is, the movement of the movable plate 41 causes the wire 9 to move in the extension direction of the wire 9, and the twisted state of the scanner 2 is avoided.

Effect As described above, according to the first, second and third aspects of the present invention, the optical scanning device is arranged so that pulleys are arranged at both ends of the scanner and a wire is rolled on the pulleys to move the scanner. In the above, since the unbalanced force applied to one end of the scanner can be removed after the device is assembled, it is possible to eliminate the twist of the scanner and keep the position accuracy of the mirror surface constant at all times. It will be able to greatly contribute to the improvement of performance. Further, since the twist of the scanner is corrected, the guide lot and the scanner are prevented from being galled, and the smooth movement of the scanner can be ensured.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a conventional optical scanning device, FIG. 2 is a perspective view for explaining an embodiment of the first invention of the present invention, and FIG. 3 is for a second invention of the present invention. FIG. 4 is a perspective view of a main part for explaining the embodiment, and FIG. 4 is a perspective view of the main part for explaining the embodiment of the third invention. 2 ... Scanner, 9 ... Wire, 12 ... Pulley, 32 ...
Sliding member (movable member), 38 ... Wire adjusting pulley, 40 ... Fastening screw (fixing means) 41 ... Moving plate (wire adjusting member)

Claims (3)

[Claims] 1. A scanner having a mirror mounted thereon has pulleys attached to both ends thereof, and wires are respectively brought into contact with the respective pulleys so that the scanner is movably arranged in a direction orthogonal to an axial direction of the respective pulleys. An optical scanning device for performing slit exposure with reflected light from the mirror, wherein a movable member having an attachment position adjustable in a moving direction of the scanner is provided at at least one end of the scanner. An optical scanning device, wherein the pulley is attached to the optical scanning device. 2. A guide member extending in a fixed direction is provided on the apparatus main body, and a scanner having a mirror attached thereto is attached to the guide member in a direction substantially orthogonal to the guide member so that the scanner is moved in parallel along the guide member. If possible, attach a pulley having an axis in a direction substantially orthogonal to the guide member to both ends of the scanner, wind a wire around each of the pulleys, and attach both ends of the wire to the apparatus main body. An optical scanning device for performing slit exposure by reflected light from the mirror by moving the scanner in parallel through the wire, wherein the wire is provided on at least one of the wires. A wire adjusting pulley that is rotatable in the extension direction of the wire adjusting pulley is attached to the apparatus main body, and fixing means for fixing the rotation angle position of the wire adjusting pulley is provided. And fixing both ends of the wire to the wire adjusting pulley so that, when the wire adjusting pulley is rotated, one end of the wire is wound and the other end is unwound. An optical scanning device characterized by. 3. A guide member extending in a fixed direction is provided on the main body of the apparatus, and a scanner equipped with a mirror is attached to the guide member in a direction substantially perpendicular to the guide member so that the scanner is translated along the guide member. If possible, attach a pulley having an axis in a direction substantially orthogonal to the guide member to both ends of the scanner, wind a wire around each of the pulleys, and attach both ends of the wire to the apparatus main body. An optical scanning device for performing slit exposure by reflected light from the mirror by moving the scanner in parallel through the wire, wherein the wire is provided on at least one of the wires. A wire adjusting member whose attachment position is adjustable in the extension direction of the wire, is attached to the main body of the apparatus, and both ends of the wire are attached from the front and rear in the extension direction of the wire. And an optical scanning device fixed to the wire adjusting member, respectively.