JPS6048013A - Multiple roof mirror array - Google Patents

Abstract

PURPOSE:To prevent deterioration in image forming performance by specifying the thickness of rims at both side parts of a multiple roof mirror array about a main body part, and then allowing the whole of the roof mirror part to receive moisture from a nonreflective surface uniformly and expand uniformly even if a high-humidity atmosphere is produced frequently. CONSTITUTION:The multiple roof mirror array body 30 is formed in a uniform, continuous, thin and long plate which has thickness (t) between top and bottom parts, and the main body 30 is molded out of synthetic resin integrally with surrounding rimbs 31. The thickness of the rims 31 is so set that W>=t/2-l, where lis the ineffective reflecting surface after the thickness W of the rims 31 and the effective reflecting surface S of the roof mirror part 30a are excluded, and then the whole of the roof mirror part 30 receives moisture uniformly from the nonreflective surface opposite to the reflecting surface, so the whole of the roof mirror part 30a expands uniformly to eliminate local strain, so that the flatness does not deteriorate.

Description

[Detailed Description of the Invention] This invention relates to a multi-roof mirror array, and more specifically to a multi-roof mirror array for an imaging device used in a same-magnification imaging optical system of a copying machine, a facsimile, etc. It is related to.

1 to 6 are examples of conventional imaging devices equipped with a multi-roof mirror array on the rear side.

1 and 4 schematically show the imaging optical system of the imaging device. This optical system includes a plate-shaped multi-lens array 1 in which a large number of lenses are consecutively arranged in a straight line, a right-angle mirror 2 for optical path conversion arranged in front of the multi-lens array 1, and a multi-lens array 1. The multi-roof mirror array 3 includes a multi-roof mirror array 3 which is arranged behind the roof mirror and has a large number of roof mirrors arranged in a continuous line. The arrangement pitch of each lens and the arrangement pitch of each roof mirror are equal, and the trough ridgeline of each roof mirror is located at the center of each lens.
A multi-lens array 1 and a multi-roof mirror array 3 are arranged. In the image formation by this imaging optical system, if we consider the image formation in the case where the optical path is not changed by the right-angle mirror 2, the object 4 is imaged in the horizontal direction as an erect real image 5 at the same position as shown in FIG. Then, in the vertical direction, an inverted real image 5 is formed at the same position as shown in FIG. Therefore, if arrayed in the horizontal direction shown in FIG. 2, the images will be connected.

Next, considering the image formation when the optical path is changed by the right-angle mirror 2, the light ray from the object 4 is reflected by one reflective surface of the right-angle mirror 2, passes through the lenses of the multi-lens array 1, and then passes through the multi-lens array 1. It is reflected by the roof mirror of the mirror array 3, passes through the lenses of the multi-lens array 1 again, is reflected by the other reflective surface of the right-angle mirror 2, and is formed as an erect real image 5. Therefore, the optical path length is much shorter than that of a transmission optical system.

FIG. 5 shows a conventional multi-roof mirror array used in the above-mentioned imaging device.

This multi-roof mirror array includes a multi-roof mirror array main body 10 formed into a plate shape by continuously extending a roof mirror portion 10a with uniform wall thickness at the peaks and valleys, and a rim 11 surrounding the multi-roof mirror array main body 10. It consists of polymethyl methacrylate (hereinafter referred to as PHMA), which is a synthetic resin.
) is integrally molded. lla is rim 1
This is a flange provided around the outer periphery of one end of 1. Dahamira part 1. Each reflective surface of Oa is formed by aluminum vapor deposition or the like.

In this way, the multi-roof mirror array main body 10 has a rim 1.
1, the multi-roof mirror array is prevented from warping, and the surface angle of the roof mirror surface of the roof mirror portion 10a is maintained sufficiently.

FIG. 7 shows an example of a recording device for a copying machine using the above-described imaging device. In the figure, reference numeral 20 is an imaging device incorporating a multi-lens array, a right-angle mirror, and a multi-roof mirror array in a housing, 21 is an original table, 22 is an illumination device, 23 is a photosensitive drum which is a recording medium, and 24 is a charging device. device, 25 is a cleaning device, 26 is a developing device, 2
7 is a transfer device, and 28 is a static eliminator. This recording device projects an image of a document on a document table 21 illuminated by an illumination device 22 through an imaging device 20 onto a photosensitive drum 23 that is uniformly charged to a predetermined polarity by a charging device w24 for exposure. After the development is performed by the developing device 26, the transfer is performed by the transfer device 27 onto the transfer paper 29, and the cleaning device 25
The remaining toner after transfer is removed, and the electric charge is removed by the static eliminator 28, thereby completing one copying cycle.

However, in such a conventional multi-roof mirror array, even if the multi-roof mirror array main body 10 is provided with the rim 11, the thickness of the rim 11 is determined to prevent warping. It is relatively thin and is formed by integral molding of synthetic resin, so it can be used when the multi-roof mirror array is stored alone or as part of an imaging device such as a copying machine or facsimile. Due to the moisture absorption that occurs under high humidity conditions when used in high humidity conditions, there was localized deterioration of flatness in some parts of the Dahamira. That is, under conditions of high humidity, moisture absorption progresses uniformly from the surface to the inside of the multi-roof mirror array, regardless of the shape.

In this case, the rim 11 and the multi-roof mirror array main body 10
If the wall thickness of the portions located on both sides of , that is, the side rims Ilb is thin, the moisture absorption of the side rims Ilb reaches the side portions of the dahamira portion 10a, and the side portions absorb moisture.

At this time, moisture is also absorbed from the non-reflective surface of the mirror part 30a on the opposite side to the aluminum-deposited reflective surface, and the central part of the mirror part 10a only absorbs moisture from the non-reflective surface. , in the side part of the dahamira part 10a, not only moisture is absorbed from the non-reflective surface, but also the side rim llb
Since it also absorbs moisture from the surrounding area, internal stress is generated when it expands due to moisture absorption, causing distortion in its side portions. When a high humidity situation occurs at 413, distortion accumulates in the side portions of the dahamira part 10a due to repeated expansion due to moisture absorption and subsequent contraction, resulting in the flatness of the reflective surface of the side parts of the dahamira part 10a. That is, there is a drawback that the flatness is locally degraded and the imaging performance is deteriorated.

Purpose This invention was made in view of these drawbacks.
The purpose of this is to ensure that even if high humidity conditions occur frequently, some side parts of the dahama receive only moisture absorption from the non-reflective surface, so that the flatness of the part of the dahama is locally degraded. The purpose of the present invention is to provide a multi-roof mirror array that does not cause problems.

Week - 1111 skin The present invention will be explained below based on the drawings.

FIGS. 8 to 11 are diagrams showing an embodiment of the present invention.

In the figure, numeral 30 is a multi-roof mirror array main body,
It is formed into an elongated plate shape by continuously forming a roof mirror portion 30a with uniform wall thickness at the peaks and valleys as shown in FIGS. 9 and 11. 31 is the multi-roof mirror array body 3
This is the rim surrounding 0. The multi-roof mirror array main body 30 and the rim 31 are integrally molded from PMMA, which is a synthetic resin. The reflective surface of each roof mirror portion 10a is formed by aluminum vapor deposition.

Further, the dimensions of the multi-roof mirror array main body 30 and the rim 31 are set to satisfy the following relationship.

In Figures 10 and 11, t is part of Dahamira 3Qa
, W is the thickness of both sides of the rim 31, α is the ineffective reflective surface of a part of the dahama mirror, and S is the effective reflective surface of the dahama mira part 3 (F).

w+g≧t/2 (1) :, W≧t/2−Q (2) In other words, if the dimensions of the multi-roof mirror array body 30 and the rim 31 are set to satisfy the above equation (2), Even if the roof mirror array is under high humidity conditions, moisture absorption progressing from the surface of the multi-roof mirror array will cause the rim 31 to absorb moisture.
The entire roof mirror part 30a passes through the parts located on both sides of the multi-roof mirror array main body 30, that is, the side legs 31a, and reaches the side parts of the roof mirror part 30a. Since moisture is evenly absorbed from the non-reflective surface on the opposite side, the entire dahamira portion 30a expands uniformly, and no local distortion occurs.

Furthermore, when using the entire reflective surface of the dahamira part 30a as an effective reflective surface, in the above equation (2), Q=
O, so W≧t/2.

In this case, the wall thickness of the side rim 31a is
It is sufficient that the thickness is 172 mm or more, which is the thickness of 0a. The wall thickness of the side rim 31a is 1/2 of the wall thickness of the dahamira part 30a.
Needless to say, any number above is not sufficient, and there are restrictions depending on the design and the components.

Of course - 1111 As explained above, according to the present invention, the structure is a multi-roof roof formed into a plate shape by connecting parts of the roof roof with uniform wall thickness at the peaks and valleys. In a multi-roof mirror array in which a mirror array main body and a rim surrounding the multi-roof mirror array main body are integrally molded from synthetic resin, the thickness of the portion of the rim located on both sides of the multi-roof mirror array main body is W. , where the thickness of a part of the roof mirror is t, and the ineffective reflection area of a part of the roof mirror is Q, the shape of the multi-roof mirror array body and the rim is expressed by the formula W≧t/2−Q. Because the settings are set to satisfy the requirements, even if high temperatures occur frequently when the multi-roof mirror array is stored alone or used as part of an imaging device in a copying machine, facsimile, etc. The whole portion absorbs moisture from the non-reflective surface evenly and expands evenly, so that the flatness of the side portion of the roof mirror does not deteriorate locally.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the imaging device, Fig. 2 is a schematic plan view showing the imaging optical system of the imaging device, Fig. 3 is a schematic side view similar to Fig. 2, and Fig. 4 is the imaging device. 5 is a perspective view of a conventional multi-roof mirror array, and FIG. 6 is a diagram of V in FIG. 5.
1-Vl line sectional view, FIG. 7 is a schematic side view showing a recording device of a copying machine incorporating an imaging device, and FIGS. 8 to 11 show an embodiment of a multi-roof mirror array of the present invention, FIG. 8 is a partially omitted plan view of the multi-roof mirror array, FIG. 9 is a partially omitted cross-sectional view of the multi-roof mirror array, FIG. 10 is a partially enlarged plan view of FIG. 8, and FIG. 11 is a partially enlarged sectional view of FIG. 9; 30...Multi roof mirror array body, 30a...
Part of the dahamira, 31...Rim, t...Thickness of part of the dahamira, W...Thickness of both sides of the rim. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 +IQ Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] A composite of a multi-roof mirror array main body formed into a plate shape by connecting parts of a roof mirror with uniform wall thicknesses at peaks and valleys, and a rim surrounding the multi-roof mirror array main body. In a multi-roof mirror array integrally molded from resin, the thickness of the portion of the rim located on both sides of the multi-roof mirror array body is W, the thickness of a portion of the roof mirror is 1,
The shape of the multi-roof mirror array body and the rim is set to satisfy the relationship W≧r/2-II, where the ineffective reflection area of a part of the roof mirror is Ω. Multi-roof mirror array.