JPH04285906A - Scanner for information recorder - Google Patents

Abstract

PURPOSE:To reduced a distortion generated at the time of attaching a scanner main body, and also, to obtain the high vibration resistance by providing a fitting part of high regidity in three parts in the scanner main body, and also, providing a fitting part of low rigidity in at least one part. CONSTITUTION:A scanner main body 10 in which a laser oscillator 11, a polygon mirror 14 and other necessary optical system, etc., are assembled is formed of a synthetic resin material, and in three parts thereof. a fitting part 18 of high rigidity having a screw hole 18a is formed integrally, and in other at least one part, a fitting part 19 of low rigidity is provided. The fitting part 19 is connected by a lever-like supporting part 19c of small rigidity between the tip part 19b having a screw hole 19a and the scanner main body 10, and they are formed integrally with the scanner main body 10. The fitting parts 18, 19 of the scanner main body 10 are provided in total four parts and the vibration resistance is almost the same degree as a conventional example, and a distortion and a stress generated at the time of tightening the scanner 10 with a screw can be absorbed by the part of the fitting part 19 of low rigidity.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanner for an information recording device, such as a laser beam printer or a copying machine, which is used for scanning a laser beam.

0002

2. Description of the Related Art Laser scanners used in conventional information recording devices generally include a scanner body 1 made of die-cast aluminum, a laser oscillator 2, a polygon mirror 3, or other necessary components, as illustrated in FIG. 4 or 5. Optical members and the like are assembled into one unit and screwed onto the scanner mounting surface of the information recording device.

[0003] For this reason, it is known that the scanner body 1 is provided with mounting portions 4 at three locations as shown in FIG. 4, or at four locations as shown in FIG. In addition, due to the recent demand for smaller and lighter information storage devices and cost reductions, there is a trend to switch the material of the scanner body from conventional aluminum die-casting to synthetic resin, but it is more rigid than aluminum. When a synthetic resin material is used, the following problems arise.

0004

[Problems to be Solved by the Invention] When screwing the mounting parts 4 at three locations as in the conventional example shown in FIG. Self-excited vibrations are likely to occur, or they are susceptible to external vibrations. Therefore, it is often necessary to take measures such as pasting a viscoelastic material such as rubber on the back side of the scanner body.

On the other hand, when the four mounting parts 4 are screwed together as in the conventional example shown in FIG. Since there are three points, if it is attempted to fix it at four points, distortion and stress will occur in the scanner body 1. This stress causes a difference in the irradiation position of the laser beam, the timing of the BD signal, etc. between the scanner itself and when the scanner main body 1 is attached to an information recording device, which impairs reliability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a scanner for an information recording device that can reduce distortion that occurs when the scanner body is attached, has high vibration resistance, and has good reliability.

[0007]

[Means for Solving the Problems] A scanner for an information recording device according to the present invention to achieve the above-mentioned object includes a scanner body in which a laser oscillator, a polygon mirror, and other necessary optical systems are assembled, and a rigid This device is characterized in that three high mounting portions are provided, and at least one other mounting portion is provided with low rigidity.

[0008]

[Operation] The scanner for information recording device having the above-mentioned configuration has a total of four or more attachment points on the scanner body, so sufficient vibration resistance can be obtained, and all but three attachment points have low rigidity. Therefore, the distortion that occurs when tightening the scanner body with screws is absorbed by this mounting part with low rigidity.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail based on the embodiments shown in FIGS. 1 to 3.

FIG. 1 is a plan view of a first embodiment of the present invention, in which a laser oscillator 1 is mounted on a laser scanner body 10.
1, collimator lens 12, cylindrical lens 13
, a polygon mirror 14 rotated by a motor (not shown), a spherical lens 15, a toric lens 16, and a reflecting mirror 17 are attached. The scanner body 10 in which these parts are assembled is molded from a synthetic resin material, and highly rigid mounting portions 18 having screw holes 18a are integrally formed at three locations, and at least one other location is provided with highly rigid mounting portions 18. A low mounting portion 19 is provided. The end portion 19b of the mounting portion 19 having a screw hole 19a and the scanner body 10 are connected by a lever-shaped support portion 19c having low rigidity, and these are integrally molded with the scanner body 10.

As shown in FIG. 2, the scanner body 10 is fastened with screws 21 to a scanner mounting surface 20 in an information recording device, that is, a laser beam printer. As is well known, a laser beam from a laser oscillator 11 is collimated by a collimator lens 12, passed through a cylindrical lens 13, reflected by a polygon mirror 14, passed through a spherical lens 15, a toric lens 16,
The photosensitive drum 22 is deflected by the reflecting mirror 17.
is irradiated. At this time, by rotating the polygon mirror 14, the laser beam is scanned in the axial direction of the drum surface.

In this embodiment, since the scanner body 10 has a total of four mounting parts 18 and 19, the vibration resistance is approximately the same as that of the conventional example shown in FIG. The low mounting part 19 reduces distortion and stress caused when screwing the scanner body 10.
This can be absorbed by the mounting portion 19 having low rigidity.

FIG. 3 shows a second embodiment, in which the shape of the mounting portion 19 with low rigidity is approximately the same as that of the mounting portion 18 with high rigidity, and instead of the shape of the mounting portion 19 with low rigidity. An example is shown in which an elastic member 23 made of nylon or the like is fitted into a slightly larger hole, and a mounting screw is inserted into the screw hole provided in the elastic member 23. In this case as well, since the elastic member 23 is interposed between the scanner body 10 and the mounting screws, optimal vibration damping characteristics can be obtained, and the elastic member 23 can absorb the distortion and stress that occurs when the scanner body 10 is tightened with the screws. It can be absorbed by member 23.

[0014] In the embodiment, the case where only one mounting portion 19 with low rigidity is provided is illustrated, but it goes without saying that the mounting portion 19 may be provided at two or more locations. In addition, various modifications to the shape and configuration are possible in addition to the embodiments.

[0015]

[Effects of the Invention] As explained above, the scanner for an information recording device according to the present invention improves vibration resistance by providing three mounting parts of the scanner body with high rigidity and at least one mounting part with low rigidity. At the same time, distortion that occurs during installation can be reduced. Therefore, even when the scanner body is made of synthetic resin, it is possible to ensure the reliability of the laser scanner.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is a partial cross-sectional view.

FIG. 3 is a plan view of the second embodiment.

FIG. 4 is a plan view of a conventional example.

FIG. 5 is a plan view of a conventional example.

[Explanation of symbols]

10　Scanner body 11 Laser oscillator 13 Polygon mirror 18 Highly rigid mounting part 19. Mounting part with low rigidity 20 Scanner mounting surface 21 Mounting screw 23 Elastic member

Claims (2)

[Claims] [Claim 1] A scanner body assembled with a laser oscillator, a polygon mirror, and other necessary optical systems, etc.
A scanner for an information recording device, characterized in that three mounting parts with high rigidity are provided, and at least one other mounting part with low rigidity is provided. 2. The scanner for an information recording device according to claim 1, wherein the mounting portion with low rigidity includes a material different from the scanner main body.