JPH03130715A - Manufacture of rotary polygon mirror - Google Patents

Abstract

PURPOSE:To easily form a mirror which is not varied in film thickness in the upper stage and the lower stage by forming the upper and the lower reflecting parts of the polygon mirror as separated bodies, bring a reflecting material to vapor-deposition and forming the reflecting surface, and thereafter, coupling the upper and the lower reflecting parts. CONSTITUTION:The upper stage reflecting part 6b and the lower stage reflecting part 6a are formed as separated bodies, a reflecting material is brought to vapor-deposition to each of them and the reflecting surface is formed, and thereafter, by coupling them, a rotary polygon mirror 6 is assembled. In such a manner, the mirror is divided into the upper stage reflecting part 6b and the lower stage reflecting part 6a and each of them is brought to vapor- deposition, therefore, adhesion angles can be made almost the same, the film thickness becomes constant and the reflection characteristics is also equalized. At the time of assembling, the lower stage reflecting part 6a is fitted into the rotor 7a of a polygon motor 7, and subsequently, the upper stage reflecting part 6b is set thereon, and a plate spring 65 is clamped to a shaft 70 with a set screw 66 through a rubber seal 64, by which the upper and the lower reflecting parts 6a,6b are fixed to the rotor 7a.

Description

[Detailed Description of the Invention] [Table of Contents] Overview Industrial Field of Application Conventional Technology (Figures 13 and 14) Means for Solving the Problems to be Solved by the Invention (Figure 1) Working Examples (a) Description of the drum-shaped polygon mirror (Figs. 2 to 4) (9) Description of one embodiment (Figs. 5 to 11) (C) Description of another embodiment (Fig. 12) Invention Effects [Summary] Regarding the manufacturing method of a rotating polygon mirror having an upper reflective part and a lower reflective part, even if the reflective surface of the polygon mirror is formed by vapor deposition, there is no change in film thickness between the upper stage and the lower stage. In a method for manufacturing a rotating polygon mirror comprising an upper reflecting section and a lower reflecting section, each of which has a plurality of reflective surfaces around its periphery, the upper reflecting section and the lower reflecting section are separated. A reflective material is deposited on each of the upper reflective part and the lower reflective part to form a reflective surface around each, and the upper reflective part and the lower reflective part on which the reflective surfaces are formed are combined. to form the rotating polygon mirror.

[Industrial application field]

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

2. Description of the Related Art Rotating polygon mirrors, so-called polygon mirrors, are widely used as means for forming scanning light in scanners such as barcode readers and laser printers.

As this polygon mirror, a V-shaped reflecting surface has been proposed in which the reflecting surface is composed of an upper reflecting section and a lower reflecting section.

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

[Conventional technology] FIGS. 13 and 14 are explanatory diagrams of the prior art.

As shown in FIG. 13, the polygon mirror 6 is composed of an upper reflecting section 6b and a lower reflecting section 6a.

To apply it to a barcode reader, a laser light source 1, a condensing lens 3, and a light receiving sensor 2 are provided, and laser light #1 is irradiated onto the lower reflecting portion 6a of the polygon mirror 6.
The light is then reflected and guided to the upper reflector 6b, where it is secondarily reflected and output to the barcode symbol BS.

The polygon mirror 6 is rotated by a polygon mirror (not shown) to scan the barcode symbol BS with laser light.

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, condensed by the condenser lens 3, and received by the light receiving sensor 2. It is converted into an electrical signal and the barcode is read.

Further, a device applied to a laser printer is disclosed in Japanese Patent Application Publication No. 24217 of 1986.

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

For this reason, if a glass mirror is manufactured by pasting it around the base, it will have an upper stage and a lower stage, which will require a large number of glass mirrors, which will increase the price and cause problems in terms of reliability in bonding etc. .

For this purpose, after molding an integrated V-shaped polygon mirror 6 in advance, as shown in FIG. It was done to form a surface.

[Problem to be solved by the invention]

However, since vapor deposition sprays the reflective material from a single point,
In the V-shaped polygon mirror 6, the attachment angles of the upper reflecting section 6b and the lower reflecting section 6a are significantly different.

For this reason, there was a problem in that the deposited film thicknesses were different between the upper reflecting section 6b and the lower reflecting section 6a of the polygon mirror 6, resulting in changes in reflection characteristics and the like.

Therefore, an object of the present invention is to provide a method for manufacturing a rotating polygon mirror that can prevent the film thickness from changing between the upper and lower stages even when the reflective surface of the polygon mirror is formed by vapor deposition. .

[Means to solve the problem]

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

The present invention provides a method for manufacturing a rotating polygon mirror 6 that includes an upper reflecting section 6b and a lower reflecting section 6a, each of which has a plurality of reflective surfaces around it, as shown in FIG. 1(A). , the upper reflective part 6b and the lower reflective part 6a are formed separately, a reflective material is deposited on each of the upper reflective part 6b and the lower reflective part 6a, and a reflective surface is formed around each of them. 1
As shown in Figure (B), the rotating polygon mirror 6 is formed by combining an upper reflecting section 6b and a lower reflecting section 6a, each of which has a reflecting surface formed thereon.

[Effect]

In the present invention, since the upper reflecting section 6b and the lower reflecting section 6a are divided and each is vapor-deposited, the deposition angles of the reflecting sections 6a and 6b can be made almost the same as shown in FIG. 1(A).

Therefore, even if a reflective surface is formed by vapor deposition, the film thickness of each reflective part 6a, 6b is constant, and the reflective characteristics etc. 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 the 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. 2.

The drum-shaped polygon mirror 6 has an upper reflecting section 6 as shown in FIG.
b and a lower reflecting section 6a, both reflecting sections 6b and 6a.
intersect at an intersection angle θ2 as shown in the side view of FIG. 3(A), and are inclined at an inclination angle θ1 as shown in the front view of FIG. 3(B).

The scanning pattern changes depending on the intersection angle θ2 and the inclination angle θ1.

When the crossing angle θ2 is changed, the scanning patterns S, to S14 are shifted in parallel according to the crossing angle θ2, as shown in FIG. 4(A).

Also, when the inclination angle θ1 is changed, as shown in Fig. 4 (B),
The scanning patterns SKI to SZ7 have different inclinations (directions) around one point depending on the inclination angle θl.

Furthermore, if both the intersection angle θ2 and the inclination angle θ are changed, as shown in FIG. Draw patterns 5ffl to S34.

Utilizing this, if the intersection angle θ2 and the inclination angle θ1 between the upper reflecting portion 6b and the lower reflecting portion 6a of the polygon mirror 6 are made constant on each surrounding surface, the One scanning pattern can be drawn, and by changing the intersection angle θ2, many parallel scanning patterns can be drawn.

Furthermore, by changing the inclination angle θl, a scanning pattern in multiple directions can be drawn as shown in FIG. 4(B), which is convenient for reading barcodes.

Furthermore, if the intersection angle θ2 and the inclination angle θl between the upper reflector 6b and the lower reflector 6a of the drum-shaped polygon mirror 6 are changed on each surrounding surface, various scanning operations as shown in FIG. 4(C) can be achieved. It is possible to draw a pattern, and the degree of freedom in reading is increased depending on the direction of the barcode, which is effective for improving operability.

(b) Description of one embodiment FIG. 5 is a block diagram of the upper reflector, FIG. 6 is a block diagram of the lower reflector, and FIG. 7 is a diagram showing the division of the upper and lower reflectors.

First, in the present invention, the polygon mirror 6 is connected to the upper and lower reflecting portions 6a.
, 6b.

In this case, as explained in FIG. 3(B), the upper and lower reflecting portions 6
Since a and 6b have a predetermined inclination angle θ1, - considering boat fishing, they are divided by the combination line of the upper and lower reflective parts 6a and 6b as shown in the upper part of Fig. 7 (A) and (B). It turns out.

However, when divided along such a combination line, the shape of the upper and lower reflective portions 6a, 6b on the combination line side becomes complicated, which is not preferable when producing by molding.

For this reason, as shown in the lower portions of FIGS. 7(A) and 7(B), the upper and lower reflective parts 6a and 6b were divided along the horizontal plane, and cuts were made in the hatched areas to simplify the shape.

By dividing in this way, the mirror surface in the shaded area is lost, but since the area is small, there is no functional problem.

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 dividing upper reflecting section 6b.

The upper reflector 6b has five peripheral surfaces from surface A to surface E, and has an engagement hole 61 with a diameter of "1" and an engagement pin 60 in the center.

FIG. 6(A) is a top view of the horizontally divided lower reflecting section 6a, and FIG. 6(B) is a cross-sectional view of the horizontally dividing lower reflecting section 6b. Reflector 6a
The ring 63a has an outer diameter r1 that is fitted into the retaining hole 61 of the upper reflective section 6b in the center, the hole 63 inside the ring 63a, and the ring 63a of the upper reflective section 6b. It has an engagement hole 62 into which an engagement pin 60 is inserted.

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

According to molding, each member can be made lightweight.

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

FIG. 8 is an explanatory diagram of the vapor deposition process.

The vapor deposition is carried out by placing the upper reflecting section 6 vertically on the rotating shaft 5 as shown in the figure.
b and the lower reflective section 6a are set, and the reflective material from the vapor deposition fQ4 is evaporated in a vacuum and sprayed onto each of the reflective sections 6a and 6b.
This is done by attaching a reflective material to each surface of each reflective section 6a, 6b.

At this time, since each of the reflective parts 6a and 6b is rotated by the rotation shaft 5, a reflective material is attached to each surface around each of the reflective parts 6a and 6b, thereby forming a reflective surface.

In this case, each reflection part 6a with respect to the adhesion direction of the vapor deposition source 4,
The adhesion angle of 6b is almost uniform, and a uniform reflective film is formed.

Of course, in this vapor deposition step, the upper reflecting section 6b may be set on the rotating shaft 5 to perform vapor deposition, and then the lower reflecting section 6a may be set on the rotating shaft 5 and vapor deposition may be performed, or the order may be reversed. Good too.

Next, the assembly of the upper and lower reflecting sections 6a and 6b will be explained.

FIG. 9 is an assembled perspective 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 through a bearing 71.
The rotor 7a is fixed at zero.

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

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

At this time, the engagement bin 60 of the upper reflector 6b (see FIG. 5)
by aligning the upper and lower reflectors 6a with the retaining holes 62 (see FIG. 6) of the lower reflector 6a and fitting the engagement holes 61 of the upper reflector 6b into the engagement rings 63a of the lower reflector 6a.
, 6b can be aligned and fixed.

By providing a rubber seal 64 on the upper reflecting section 6b and fixing the plate spring 65 to the rotating shaft 70 with a set screw 66, the upper and lower reflecting sections 6a and 6b are fixed, and the stator 7a is fixed.
It will be fixed at

The pentahedral polygon mirror constructed in this way is the 10th
It has the shape shown in the figure.

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

The pentahedral polygon mirror 6 formed in this way can be made by changing the inclination angle θ1 and the intersection angle θ7 of each surrounding surface.
Five scanning patterns with mutually different scanning directions as shown in FIG. 11 can be drawn.

(C) Description of other embodiments The t2H is an explanatory diagram of another embodiment of the present invention.

In the above-mentioned embodiment, the upper and lower reflective parts 6a and 6b are divided on the horizontal plane, but as in this embodiment, the upper and lower reflective parts 6a and 6b are
, 6b may be divided along a combination line along the slope.

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

Furthermore, in the above embodiment, a pentahedron is used in which the inclination angle and the intersecting angle change on each face in order to generate a multidirectional scanning pattern, but 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 above using examples, the present invention can be modified in various ways according to the gist of the present invention, and these are not excluded from the present invention.

(Effects of the Invention) As explained above, according to the present invention, in a rotating polygon mirror having upper and lower reflective parts, the upper and lower reflective parts are divided and formed separately, and each is vapor-deposited to form a reflective film. Because of this, it is possible to form opposite films on the upper and lower reflective parts by uniform vapor deposition, and the reflective surfaces of a rotating polygon mirror having a large number of reflective surfaces can be formed by vapor deposition, making it suitable for mass production.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a perspective view of an hourglass-shaped polygon mirror according to the present invention, Fig. 3 is a block diagram of the hourglass-shaped polygon mirror having the configuration shown in Fig. 2, and Fig. 4 is a diagram of the arrangement shown in Fig. 2. FIG. 5 is a diagram illustrating the scanning pattern of a drum-shaped polygon mirror, FIG. 5 is a configuration diagram of an upper reflection section according to an embodiment of the present invention, FIG. 6 is a construction diagram of a lower reflection section according to an embodiment of the invention, and FIG. FIG. 8 is an explanatory diagram of the vapor deposition process of one embodiment of the present invention, FIG. 9 is an assembled sectional view of the upper and lower reflective sections of one embodiment of the present invention, and FIG. FIG. 11 is an explanatory diagram of the scanning pattern of one embodiment of the present invention; FIG. 12 is an explanatory diagram of another embodiment of the present invention; FIGS. 13 and 14 are FIG. 2 is an explanatory diagram of a prior art. In the figure, 6-rotating polygon mirror (polygon mirror), 6a-lower reflecting section, 6b-upper reflecting section.

Claims (1)

[Claims] A method for manufacturing a rotating polygon mirror (6) comprising an upper reflecting section (6b) and a lower reflecting section (6a) each having a plurality of reflective surfaces around the periphery, comprising: A reflective part (6b) and a lower reflective part (6a) are formed separately, a reflective material is deposited on each of the upper reflective part (6b) and the lower reflective part (6a), and a reflective surface is formed around each. A method for manufacturing a rotating polygon mirror, characterized in that the rotating polygon mirror (6) is formed by combining an upper reflecting section (6b) on which the reflecting surface is formed and a lower reflecting section (6a). .