JPH0434504Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention relates to an optical deflection device that rotates a plate-shaped mirror and scans by reflecting a light beam on both sides of the mirror. The present invention relates to an optical deflection device capable of finely adjusting the inclination of a mirror surface.

[Prior Art] As shown in FIG. 2, this type of optical deflection device used in conventional laser printers and the like includes a plate-shaped mirror 1 whose front and back surfaces are both mirror surfaces 1A and 1B on a base 3. This base 3 is rotated in the direction of the arrow by a motor (not shown),
A light beam is reflected by mirror surfaces 1A and 1B of a rotating mirror 1, and the reflected light scans a photosensitive material 2 to record characters and images.

[Problems to be solved by the invention] In the above conventional example, since the light beam is reflected on the front and back surfaces of the mirror 1, it is necessary to ensure that the rotation axis of the motor and the mirror surfaces 1A and 1B are accurately parallel to each other. It is necessary to install it.

That is, if the rotation axis of the motor is not parallel to the mirror surfaces 1A and 1B, the positions on the photosensitive material scanned by the light beams reflected by the mirror 1A and the mirror 1B on the opposite side will be different, resulting in uneven scanning, etc. The problem arises.

As a means to solve this problem, a correction optical system is provided on the side of the photosensitive material behind the rotating mirror 1.
A possible method is to correct the scanning position of the light beam on the scanning surface.

However, the provision of such a correction optical system causes a problem of increased cost, so it is more effective to accurately adjust the rotation axis of the motor and the mirror surface, since it is possible to keep the cost low.

However, while the scanning line density of laser printers used for general office use is about 8 to 20 lines/mm, the scanning line density of laser phototypesetting machines, etc. that use the output as printing plates is is 50~
It has a high density of 120/mm. For this reason, especially when a correction optical system is not used in a light deflection device for a laser phototypesetting machine, the permissible range of inclination between the rotational axis of the motor and the mirror surface must be within a few seconds, and the angle can be adjusted in seconds. The problem was that an extremely precise adjustment mechanism was required.

[Means for Solving the Problems] An object of the present invention is to provide a light deflection device capable of precise and fine adjustment, which can also be used in laser phototypesetting machines.

In order to solve the above problems and achieve the purpose, the optical deflection device of the present invention has opposing grooves formed in the lower part of the base on which the mirror is fixed and the upper part of the holder on which the base is placed, and inside these grooves. A cylindrical roller is housed in the holder, and the base is placed on a holder using the roller as a fulcrum, and connected with an adjustment screw.

In particular, the groove is set to form an angle θ (θ = 45 to 85°) with respect to the longitudinal direction of the mirror fixed to the base, and by operating an adjustment screw, the groove can be adjusted to rotate relative to the base. The holder is tilted using the fulcrum as a fulcrum, thereby making it possible to finely adjust the angle of the mirror.

[Examples] Examples of the present invention will be described below based on the drawings.

1 to 3 are a plan view, a front view, and a side view of an optical deflection device according to an embodiment of the present invention, respectively, and FIG. 3 is an exploded perspective view of the optical deflection device shown in FIG. 1.

1 is a plate-shaped mirror whose front and back surfaces are mirror surfaces.

Reference numeral 3 denotes a base having a substantially cylindrical shape, and the mirror 1 is fixed to the upper part 3a. Further, in the lower part 3b of the base 3, a V-groove 4 is formed at a certain angle with respect to the reflective surface of the mirror 1, and on both sides of the V-groove 4, there are screw holes 11 that open toward the lower surface. It is formed.

A holder 5 is attached to the rotating shaft of the motor and has a substantially cylindrical shape. A V-groove 6 is formed in the upper part 5a of this holder 5 at a position opposite to the V-groove 4 of the base 3, and a mounting part 12 for attaching to the rotating shaft of the motor is formed in the lower part 5b.
is provided.

Further, the holder 5 is provided with through holes 10 communicating with the screw holes 11 of the base 3 at positions perpendicular to the V grooves on both sides of the V groove 6.

7 is a roller having a cylindrical shape, and the V-groove 4,
It is housed in the V-groove so as to be in contact with the inner surface of 6.

8 is an adjustment screw, and after passing through the spring washer 9,
It is screwed into a screw hole 11 of the base 3 through a through hole 10 of the holder 5.

In the optical deflection device having the above configuration, the base 3 is connected to the holder 5 by the adjusting screw 8 via the rollers 7.
By turning the two adjustment screws 8 as appropriate, the base 3 is tilted relative to the holder 5 using the rollers 7 as fulcrums.

As shown in FIG. 1, the V-grooves 4 and 6 in this embodiment form an angle θ (θ=
It is formed in a rotated position by 45 to 85 degrees).

If the V grooves 4 and 6 are formed in the longitudinal direction of the mirror 1, even a slight rotation of the adjustment screw 8 will cause the mirror 1 to
The camera tilts so much that it becomes impossible to make adjustments in seconds.

Therefore, in this embodiment, by forming the V grooves 4 and 6 at positions rotated by an angle θ with respect to the longitudinal direction of the mirror 1, even if the base 3 is tilted greatly using the rollers 7 as a fulcrum, the mirror 1 The slope is not large and can be finely adjusted.

That is, if the distance between the center of the roller 7 and the adjustment screw 8 is L, and the amount of movement of the adjustment screw 8 is P, then the mirror 1
The slope Δ can be expressed as Δ=tan(P/L×cosθ). For example, when θ=80°,
It can be confirmed that it is necessary to move the adjustment screw approximately 5.8 times in order to tilt the mirror by the same angle as when θ = 0°.

Therefore, it is possible to perform finer angle adjustment than when the V grooves 4 and 6 are formed in the longitudinal direction of the mirror 1 (θ=0°).

In this embodiment, only one roller 7 is inserted into the V-grooves 4 and 6, but this can be divided into two.
It is also possible to configure the rotary shaft of the motor to pass between the two rollers.

Further, in this embodiment, the groove into which the roller 7 is inserted is a V-shaped groove with a V-shaped cross section, but the groove is not limited to this, and any groove that can position the roller 7 can be used. It may have a shape like this, and is collectively referred to as a V-groove.

Furthermore, the adjustment screw 8 in this embodiment passes through the holder 5 and is screwed into the base 3;
It is obvious that the structure is substantially the same even if the structure is screwed onto the holder 5 from the base 3 side.

[Effects of the invention] According to the invention, the inclination of the mirror can be adjusted in seconds, and extremely minute adjustments are also possible.

In addition, since no special correction optical system is required,
Significant cost increases can be prevented.

[Brief explanation of drawings]

1 to 3 are respectively a plan view, a front view, and a side view of an optical deflection device according to an embodiment of the present invention, FIG. 2 is a diagram showing a conventional optical deflection device, and FIG. 3 is a diagram showing a conventional optical deflection device.
FIG. 2 is an exploded perspective view of the optical deflection device shown in the figure. 1... Mirror, 2... Photosensitive material, 3... Base, 4, 6... V groove, 5... Holder, 7... Roller, 8... Adjustment screw, 10... Through hole, 11...
screw hole.

Claims (1)

[Claims for Utility Model Registration] In an optical deflection device that rotates a plate-shaped mirror and scans by reflecting a light beam on both sides of the mirror, the lower part of a base fixing the mirror and the base are mounted. formed on the top of the holder,
Angle θ (θ=45~
A cylindrical roller is accommodated in a groove forming an angle of 85°, and a base is placed on a holder using the roller as a fulcrum,
An optical deflection device characterized in that the base and the holder are adjustable and connected by an adjustment screw.