JP2837466B2 - Rotating polygon mirror manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Table of Contents] Overview Industrial application field Conventional technology (FIGS. 13 and 14) Problems to be Solved by the Invention Means for Solving the Problems (FIG. 1) Action Embodiment (A) Description of the drum-shaped polygon mirror (FIGS. 2 to 4)
(B) Description of one embodiment (FIGS. 5 to 11) (c) Description of another embodiment (FIG. 12) Effect of the Invention [Overview] Rotation Having Upper Reflection Unit and Lower Reflection Unit Regarding the manufacturing method of the polygon mirror, even if the reflection surface of the polygon mirror is formed by evaporation,
A method of manufacturing a rotary polygon mirror for manufacturing a rotary polygon mirror including an upper reflecting portion and a lower reflecting portion each having a plurality of reflecting surfaces around the object, so as to prevent a change in film thickness between the upper stage and the lower stage. In, the upper reflecting portion and the lower reflecting portion are formed separately, a reflecting material is deposited on each of the upper reflecting portion and the lower reflecting portion, and a reflecting surface is formed around each of the reflecting surfaces. The upper reflecting part and the lower reflecting part thus formed are combined to form the rotary polygon mirror.

[Industrial applications]

The present invention relates to a method for manufacturing a rotary polygon mirror having an upper reflecting section and a lower reflecting section.

Rotating polygon mirrors, so-called polygon mirrors, are widely used as means for forming scanning light, such as bar code readers and scanners such as laser printers.

As this polygon mirror, a mirror having a V-shape in which the reflection surface is constituted by an upper reflecting portion and a lower reflecting portion has been proposed.

It is desired that such a polygon mirror can be easily manufactured.

[Conventional technology]

 FIG. 13 and FIG. 14 are explanatory diagrams of the prior art.

As shown in FIG. 13, the polygon mirror 6 is
6b and a lower reflector 6a.

To apply to a barcode reader, a laser light source 1 and
A condenser lens 3 and a light receiving sensor 2 are provided, and a laser beam of the laser light source 1 is irradiated to a lower reflecting portion 6a of a polygon mirror 6;
The light is primary-reflected, guided to the upper reflecting part 6b, and secondary-reflected and emitted to the barcode symbol BS.

The polygon mirror 6 is rotated by a polygon motor (not shown) so that a laser beam is scanned on the barcode symbol BS.

The reflected light from the barcode symbol BS is reflected by the upper reflector 6b of the polygon mirror 6, guided to the lower reflector 6a, further reflected, collected by the condenser lens 3, and received by the light receiving sensor 2, The bar code is read after being converted into an electric signal.

A laser printer applied thereto is disclosed in Japanese Patent Application Laid-Open No. 24217/64.

Such a V-shaped polygon mirror (also referred to as a drum-shaped polygon mirror) 6 has a large number of reflection surfaces around it.

For this reason, if a glass mirror is attached around the base and manufactured, a large number of glass mirrors are required since the glass mirror has an upper stage and a lower stage, which increases the cost and raises a problem in reliability in bonding and the like.

For this reason, after the integral V-shaped polygon mirror 6 is molded in advance, as shown in FIG. 14, the reflective material is skipped from the evaporation source 4 and the reflective material is adhered around the polygon mirror 6 to be reflected. Forming a surface was done.

[Problems to be solved by the invention]

However, since the vapor deposition removes the reflective material from one point, in the V-shaped polygon mirror 6, the upper reflective portion 6b and the lower reflective portion 6a have significantly different attachment angles.

Therefore, there is a problem that the thickness of the deposited film differs between the upper reflecting portion 6b and the lower reflecting portion 6a of the polygon mirror 6, and the reflection characteristics and the like change.

Accordingly, an object of the present invention is to provide a method for manufacturing a rotating polygon mirror that can prevent a change in film thickness between an upper stage and a lower stage even when a reflection surface of a polygon mirror is formed by vapor deposition. .

[Means for solving the problem]

 FIG. 1 is a diagram illustrating the principle of the present invention.

The present invention relates to a method for manufacturing a rotary polygon mirror for manufacturing a rotary polygon mirror 6 comprising an upper reflecting section 6b and a lower reflecting section 6a each having a plurality of reflecting surfaces around the periphery, as shown in FIG. The upper reflective portion 6b and the lower reflective portion 6a are formed separately, and a reflective material is deposited on each of the upper reflective portion 6b and the lower reflective portion 6a to form a reflective surface around each of them. Fig. 1 (B)
As shown in FIG. 7, the upper reflecting portion 6b and the lower reflecting portion 6a having the reflecting surfaces are combined to form the rotary polygon mirror 6.

[Action]

In the present invention, since the upper reflector 6b and the lower reflector 6a are divided and vapor-deposited on each, the adhesion angles of the reflectors 6a and 6b in vapor deposition can be made substantially the same as shown in FIG.

For this reason, even if the reflection surface is formed by vapor deposition, the film thickness of each of the reflection portions 6a and 6b becomes constant, and the reflection characteristics and the like are also made uniform.

〔Example〕

(A) Description of the drum-shaped polygon mirror FIG. 2 is a perspective view of the drum-shaped polygon mirror, FIG. 3 is a configuration diagram of the drum-shaped polygon mirror, and FIG. 4 is an explanatory diagram of a scanning pattern of the drum-shaped polygon mirror.

3 (A) is a side view of FIG. 2, and FIG. 3 (B) is a front view of FIG.

The drum-shaped polygon mirror 6 has an upper reflecting portion as shown in FIG.
6b and a lower reflecting portion 6a, and both reflecting portions 6b and 6a
And cross at crossing angle theta ₂ as a side view in FIG. (A),
It is inclined at the inclination angle theta ₁ relationship as the front view of FIG. 3 (B).

Scan pattern is changed by this crossing angle theta ₂ between the inclination angle theta _1.

When changing the cross angle theta _2, as in the FIG. 4 (A), parallel shift scan pattern S ₁₁ to S ₁₄ in accordance with the intersection angle theta _2.

Further, when changing the inclination angle theta _1, as in the FIG. 4 (B), the scan pattern S ₂₁ to S according to the inclination angle theta _{1 27} thereof tilts about one point (direction) are different.

Furthermore, when changes to both cross angle theta ₂ between the inclination angle theta _1,
As in FIG. 4 (C), the slope around the large number of points in accordance with the inclination angle theta ₁ to the cross angle theta ₂ (direction) draws a different scanning pattern S ₃₁ to S _34.

Using this, if the cross angle theta ₂ between the inclination angle theta ₁ between the upper reflective portion 6b and the lower reflection unit 6a of the polygon mirror 6 is constant around the surfaces, JP 64-24217 JP like,
Draw one scan pattern, be changed cross angle theta _2, draw a large number of scan pattern parallel.

Further, if changing the inclination angle theta _1, draw a multidirectional scan pattern as FIG. 4 (B), it is convenient to read the bar code.

Further, by changing the cross angle theta ₂ between the inclination angle theta ₁ between the upper reflective portion 6b and the lower reflection unit 6a of the hourglass polygon mirror 6 around the surfaces, diverse, such as FIG. 4 (C) A simple scanning pattern can be drawn, the degree of freedom of reading with respect to the direction of the barcode increases, and this is effective for improving operability.

(B) Description of one embodiment FIG. 5 is a configuration diagram of an upper reflection unit, FIG. 6 is a configuration diagram of a lower reflection unit, and FIG.

First, according to the present invention, the polygon mirror 6 is
a, 6b.

In this case, as described with reference to FIG.
6a, 6b because we have a predetermined inclination angle theta _1, Generally considered, FIG. 7 (A), divides the upper and lower reflective portions 6a, 6b combination line as shown in the upper portion of (B) Will be.

However, when divided by such a combination line, the shape of the combination line side of the upper and lower reflecting portions 6a and 6b becomes complicated, which is not preferable in forming by molding.

For this reason, as shown in the lower part of FIGS. 7 (A) and 7 (B), the upper and lower reflectors 6a and 6b are divided by a horizontal plane, and cuts are made in the hatched portions to simplify the shape. By this division, the mirror surface in the shaded portion is lost, but there is no problem in function because the area is small.

FIG. 5 (A) is a top view of the horizontally divided upper reflecting section 6b, and FIG. 5 (B) is a cross-sectional view of the horizontally divided upper reflecting section 6b.

Upper reflection unit 6b has around five sides of the A side to the E-plane, the engaging hole 61 of a diameter r ₁ to the center, and an engaging pin 60.

FIG. 6A is a top view of a horizontally divided lower reflecting section 6a, and FIG. 6B is a cross-sectional view of a horizontally divided lower reflecting section 6b, like the upper reflecting section 6b. The reflecting portion 6a also has five surfaces from the A surface to the E surface at the periphery, and the upper reflecting portion 6b in the center.
And the ring 63a of the outer diameter r ₁ to be fitted in the engaging hole 61, the hole 63 of the inner, the engaging pin 60 of the upper reflective portion 6b has an engaging hole 62 to be inserted.

The upper and lower reflecting portions 6a and 6b having such a configuration are formed by molding.

 According to the molding, each member can be made lightweight.

 Next, vapor deposition is performed to form a reflection surface.

 FIG. 8 is an explanatory view of a vapor deposition step.

The deposition is performed vertically on the rotation axis 5 as shown in the figure,
6b and the lower reflecting portion 6a are set, and the reflecting material is evaporated from the evaporation source 4 in a vacuum, and is scattered to each of the reflecting portions 6a and 6b.
This is performed by attaching a reflective material to each surface of 6a and 6b.

At this time, since each of the reflecting portions 6a and 6b is rotated by the rotating shaft 5, a reflecting material adheres to each surface around each of the reflecting portions 6a and 6b, and a reflecting surface is formed.

In this case, each reflecting portion 6a with respect to the attaching direction of the evaporation source 4
The attachment angle of 6b is substantially uniform, and a uniform reflection film is formed.

Of course, in this vapor deposition step, vapor deposition may be performed by first setting the upper reflecting portion 6b on the rotating shaft 5 and then performing vapor deposition by setting the lower reflecting portion 6a on the rotating shaft 5, and the order may be reversed. Is also good.

 Next, the assembly of the upper and lower reflectors 6a and 6b will be described.

FIG. 9 is an assembled sectional view of the upper and lower reflectors, and FIG. 10 is an assembled perspective view of the upper and lower reflectors.

As shown in FIG. 9, a rotating shaft 70 is provided at the center of the stator 7b of the polygon motor 7 via a bearing 71, and the rotor 7a is fixed to the rotating shaft 70.

The lower reflector 6a is inserted into the rotor 7a of the polygon motor 7 so that the hole 63 is fitted into the rotor 7a.

Next, the upper reflecting section 6b is set to the fitted lower reflecting section 6a.

At this time, the engaging pin 60 (see FIG. 5) of the upper reflecting portion 6b is aligned with the engaging hole 62 (see FIG. 6) of the lower reflecting portion 6a, and the engaging hole 61 of the upper reflecting portion 6b is connected to the lower reflecting portion. By fitting into the engagement ring 63a of 6a, the positioning and fixing of the upper and lower reflectors 6a, 6b can be performed.

Then, a rubber seal 64 is provided on the upper reflecting portion 6b,
By fixing the 65 to the rotating shaft 70 with the set screw 66, the upper and lower reflectors 6a, 6b are fixed and fixed to the stator 7a.

The pentahedral polygon mirror constructed in this way is
It has a shape as shown in Figure 10.

FIG. 11 is an explanatory diagram of a scanning pattern of such a polygon mirror.

The pentahedral polygon mirror 6 thus formed draws five scanning patterns having different scanning directions as shown in FIG. 11 by changing each inclination angle θ ₁ and intersection angle θ ₂ of each peripheral surface. be able to.

(C) Description of Another Embodiment FIG. 12 is an explanatory diagram of another embodiment of the present invention.

In the above-described embodiment, the division of the upper and lower reflectors 6a and 6b is performed on the horizontal plane. However, as in this embodiment, the upper and lower reflectors 6a and 6b are divided.
May be divided by a combination line along the inclination of.

 In this way, the mirror area can be used effectively.

Further, in the above-described embodiment, the pentahedron in which the tilt angle and the crossing angle change on each surface in order to generate a multi-directional scanning pattern has been described. However, even if these angles are constant or one of them changes. The shape is not limited to a pentahedron, but may be a hexahedron or the like.

Although the present invention has been described with reference to the embodiments, the present invention can be variously modified in accordance with the gist of the present invention, and these are not excluded from the present invention.

〔The invention's effect〕

As described above, according to the present invention, for a rotating polygon mirror having upper and lower reflecting portions, the upper and lower reflecting portions are divided and formed separately, and then each is deposited to form a reflecting film. This has the effect that a reflective film can be formed on the reflective portion by uniform vapor deposition, and the reflective surface of a rotating polygon mirror having a large number of reflective surfaces can be formed by vapor deposition, which is suitable for mass production.

[Brief description of the drawings]

1 is a principle view of the present invention, FIG. 2 is a perspective view of a drum-shaped polygon mirror according to the present invention, FIG. 3 is a configuration diagram of a drum-shaped polygon mirror having the configuration of FIG. 2, and FIG. 4 is FIG. FIG. 5 is an explanatory diagram of a scanning pattern of a drum-shaped polygon mirror having a configuration, FIG. 5 is a configuration diagram of an upper-stage reflector of one embodiment of the present invention, FIG. 6 is a configuration diagram of a lower-stage reflector of one embodiment of the present invention, and FIG. FIG. 8 is an explanatory view of a vapor deposition process of an embodiment of the present invention, FIG. 9 is an assembly sectional view of an upper and lower reflector of one embodiment of the present invention, FIG. FIG. 11 is an explanatory view of a scanning pattern of an embodiment of the present invention, FIG. 12 is an explanatory view of another embodiment of the present invention, FIG. 13 and FIG. It is explanatory drawing of a prior art. In the figure, 6: rotating polygon mirror (polygon mirror), 6a: lower reflecting section, 6b: upper reflecting section.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Kitamura 1015 Kamikodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Within Fujitsu Limited (72) Inventor Tamotsu Takahashi 2-16-20 Shimura, Itabashi-ku, Tokyo Within Copal Co., Ltd. (72) Inventor Biao Ishii 2-16-20 Shimura, Itabashi-ku, Tokyo Copal Corporation (72) Inventor Yoshihiro Oyama 2-16-20 Shimura, Itabashi-ku, Tokyo Copal Corporation (72) Inventor Sasaki Tatsuo 2-16-20 Shimura, Itabashi-ku, Tokyo Copal Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) G02B 26/10 G02B 5/08

Claims (1)

(57) [Claims] 1. A method for manufacturing a rotary polygon mirror, comprising: a rotary polygon mirror (6) comprising an upper reflecting section (6b) and a lower reflecting section (6a) each having a plurality of reflecting surfaces around the upper reflecting section. The reflecting part (6b) and the lower reflecting part (6a) are formed separately, a reflecting material is deposited on each of the upper reflecting part (6b) and the lower reflecting part (6a), and a reflecting surface is formed around each part. And forming the rotating polygon mirror (6) by combining the upper reflecting section (6b) with the reflecting surface and the lower reflecting section (6a).