JPS6048014A - Image forming device - Google Patents

Abstract

PURPOSE:To improve image forming performance by using an effective reflecting surface having good flatness, and to improve the productivity of a multiple roof mirror array by forming ineffective reflecting surfaces as roof mirror surfaces positioned at both terminals of the multiple roof mirror array. CONSTITUTION:A couple of roof mirror surfaces 30a1 and 30a2 are formed at roof mirror parts 30a positioned at both terminals of the multiple roof mirror array 33, and the roof mirror surface 30a1 on the end part has a thickness variation structure, so the flatness deteriorates owing to a drop in molding. For the purpose, this part is regarded as an ineffective reflecting surface and not used; and aperture holes 35 at both terminals of an aperture plate 36 provided between a multiple lens array 34 and the multiple roof mirror array 33 are closed to form nonaperture parts 37, and an area which is close to the center and has the uniform quantity of light is used as an effective image formation area.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an imaging device, and more particularly to an imaging device used in a 1-magnification imaging optical system of an Enoki camera, a facsimile, and the like.

As a conventional imaging device, there are those shown in FIGS. 1 to 6.

1 to 4 schematically show the imaging optical system of the imaging device. This optical system includes a multi-lens array 1 formed into a plate shape by continuously arranging a large number of lenses in a straight line;
It includes a right-angle mirror 2 for optical path conversion arranged in front of the multi-lens array 1, and a multi-roof mirror array 3 arranged in the rear of the multi-lens array 1, in which a large number of roof mirrors are continuously arranged in a straight line. I'm here. The multi-lens array 1 and the multi-roof mirror array 3 are arranged such that the arrangement pitch of each lens is equal to the arrangement pitch of each roof mirror, and the ridgeline of the valley of each roof mirror is located at the center of each lens. In image formation by this imaging optical system, if we consider 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. In the vertical direction, an inverted real image is formed at the same position as shown in FIG. Therefore,
When arrayed in the horizontal direction as shown in FIG. 2, the images are connected. Next, considering 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 and passes through the lenses of the multi-lens array 1,
Next, it is reflected by the roof mirror of the multi-roof 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 concrete multi-roof mirror array I3 used in the imaging device.

This multi-roof mirror array 13 includes a multi-roof mirror array main body 10 formed into a plate shape by continuously forming a roof mirror part 10a with a uniform wall thickness at the peaks and valleys, and a rim 11 surrounding the multi-roof mirror array main body 10. Polymethyl methacrylate (hereinafter referred to as PM) is a synthetic resin consisting of
It is integrally molded by M^.

Each reflective surface of the Dahamira portion 10a is formed by aluminum vapor deposition or the like. In this way, since the multi-roof mirror array main body 10 is provided with the rim 11,
The multi-roof mirror array 13 is prevented from warping, and the perpendicularity of the roof mirror portion 10a is sufficiently maintained.

FIG. 7 shows an example of a recording device for a copying machine using an 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 a document table, 22 is an illumination device,
23 is a photosensitive drum which is a recording medium; 24 is a charging device;
25 is a cleaning device, 26 is a developing device, 27 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 24 for exposure. ,
After being imaged by the developing device 26, the transfer device 27 is transferred to the transfer paper 29.
The toner remaining after transfer is removed by the cleaning device 25, and the electric charge is removed by the static eliminator 28, thereby completing one copying cycle.

However, in such conventional imaging devices,
A multi-roof mirror array 13 arranged behind a multi-lens array I formed into a plate shape by arranging a large number of lenses in a straight line forms a continuous roof mirror part 10a with uniform wall thickness at the peaks and valleys. Since the multi-roof mirror array 13 was integrally molded from synthetic resin into a plate shape, when the multi-roof mirror array 13 was integrally molded from synthetic resin, the multi-roof mirror array 13
The roof mirror portions 10a located at both ends have an uneven thickness structure, and due to sink marks that occur during molding, the roof mirror portions 10a are
Since the flatness of the roof mirror surface is lower than the flatness of the roof mirror surface of the other roof mirror part 10a having a uniform thickness structure, there was a drawback that the imaging performance deteriorated.

1 - Shuko's invention was made in view of these drawbacks.
The purpose of this is to use some of the roof mirror surfaces located at both ends of the multi-roof mirror array as non-effective reflective surfaces, and to improve the imaging performance by using effective reflective surfaces with good flatness. An object of the present invention is to provide a multi-roof mirror array that improves productivity.

Yutaka - Ichiichiso The present invention will be explained below based on the drawings.

8 to 14 are diagrams showing a first embodiment of the present invention.

In the figure, reference numeral 33 is a multi-roof mirror array used in an imaging device, and the multi-roof mirror array main body 30 of the multi-roof mirror array 33 has a continuous roof mirror portion 30a with uniform wall thickness at the peaks and valleys. It is formed into a long and narrow plate shape. 31 is Multizino 1 mirror array main body 30
The rim surrounding the Multi roof mirror array body 3
The multi-roof mirror array 33 consisting of the mirror 0 and the rim 31 is integrally molded from PMMA, which is a synthetic resin.

The reflective surface, which is the roof mirror surface of each roof mirror portion 30a, is formed by aluminum vapor deposition.

A pair of roof mirror surfaces 30az of a roof mirror portion 30a located at both ends of the multi-roof mirror array main body 30.

30a2, the end side roof mirror surface 30a1 is the first
As shown in Figure 0, since the thickness is uneven, the flatness is reduced due to sink marks during molding.

FIG. 11 shows a first modification of the multi-roof mirror array 33 used in the first embodiment. The multi-roof mirror array 43 of this modification differs from the multi-roof mirror array 33 shown in FIG. 10 in the cross-sectional shape of both ends, but like the one of FIG. Part 40a is a pair of roof mirror surfaces 40a
1,40az, of which 4 parts are located on the end side of Dahamira.
0a1 has decreased flatness. 41 is a rim.

FIG. 12 shows a second modification of the multi-roof mirror array main body 30 shown in FIG. 10. The multi-roof mirror array 53 of this modification differs from that shown in FIG.
a has one roof mirror surface 50a1 with reduced flatness, and the roof mirror part 5 adjacent to the roof mirror part 50a
0a has a pair of roof mirror surfaces 5[)ax and 50a2. 51 is a rim.

FIG. 13 shows a third modification of the multi-roof mirror array main body 30 shown in FIG. 10. The multi-roof mirror array 63 of this modified example is the multi-roof mirror array 3 of the second modified example.
Although the cross-sectional shape of both ends is different from that of the second modification, the roof mirror portions 60a located at both ends of the multi-roof mirror array main body 60 have one roof mirror surface 60a1 with reduced flatness. 61 is a rim.

FIG. 14 shows the imaging light flux and light quantity distribution in the imaging device according to the first embodiment of the present invention and the imaging optical system using the multi-roof mirror array 33 shown in FIG.

Reference numeral 34 is a plate-shaped lens made by arranging a large number of lenses in a straight line.
Between the multi-lens array 34 and the multi-roof mirror array 33, there is a diaphragm plate 3 formed in a plate shape with a large number of diaphragm holes 35 arranged in a straight line.
6 is interposed. The aperture holes 35 located at both ends of the aperture plate 36 are closed and formed as non-opening portions 37 .

Next, the effect will be explained.

A, b, c, ... f shown in FIG. 14 are the imaging light flux and its light amount distribution on the roof mirror surface of each roof mirror portion 33a of the multi-roof mirror array 33, and their combined light amount is expressed as the distribution of a. can get. Also, a with diagonal lines
are a pair of mirror surfaces 30a1 and 30a of the roof mirror portion 30a located at both ends of the multi-roof mirror array 33.
The light amount distribution at a2 is shown. Therefore, a excluding a
The subsequent combined light amount is obtained as the distribution of the mouth. A portion of the roof mirror 30a located at both ends of the multi-roof mirror array 33
Since the imaging performance of the lens is degraded due to poor flatness, it is necessary to use the area excluding the area where this imaging light beam reaches, or to cut it. Therefore, as is clear from Figure 4, the imaging performance is good. Since the area with a large and uniform amount of light is located near the center after P, it is desirable to use this area as an effective imaging area. It is clear that it is desirable not to use the pair of roof mirror surfaces 30a1 and 30az of 30a as effective reflecting surfaces.

I'm tasting it. That is, the roof mirror part 30a, which is located at both ends of the multi-roof mirror array main body 30 and seals the roof mirror surface 30a1 whose flatness has decreased due to sink marks during molding and the roof mirror surface 30a2 whose flatness has not decreased, is also used. For example, an area with poor imaging performance will be used as an effective imaging area, and good imaging performance will not be obtained.

Therefore, in order not to use the dahama mirror portions 30a located at both ends of the multi-dahama mirror main body 30, that is, to make them non-effective reflective surfaces, the aperture holes 35 located at both ends of the aperture plate 36 are closed and used as non-aperture portions 37. There is.

Note that when molding a multi-roof mirror, if the required effective imaging area is known in advance, the number of roof mirror portions 30a that have sufficient flatness and serve as effective reflecting surfaces and the multi-roof mirror array main body 30 Dahamira part 30a at both ends of
The number of parts of the roof mirrors of the entire roof mirror array required, that is, the length, is determined by the total number of roof mirrors.

2. Since the roof mirror portions 30a located at both ends of the multi-roof mirror array main body 30 are not used, there is no need to consider the possibility of sink marks occurring at both end portions of the multi-roof mirror array main body 30, and the quality of the both end portions is eliminated. Since this is not a problem, the productivity of the multi-roof mirror array 33 is improved.

The above example uses the multi-roof mirror array 33 shown in FIG. 10 as an imaging device, but the multi-roof mirror array 4 of the first to third modified examples shown in FIGS. 11 to 13
3, 53, and 63 is used in an imaging device, the operation is the same, so a description of the operation will be omitted.

FIG. 15 shows an imaging light flux and a light quantity distribution in an imaging device according to a second embodiment of the present invention and an imaging optical system using the multi-roof mirror array 33 shown in FIG.

In the figures, parts or parts that are the same or equivalent to those in the first embodiment are denoted by the same reference numerals and redundant explanations will be omitted.

A large number of aperture holes 38 are provided in the front part of the multi-lens array 34.
A diaphragm hood 3B is provided which is formed into a plate shape by arranging the apertures a in a row. The aperture holes 38a provided at both ends of the aperture hood 38 are closed and formed as non-opening portions 39.

The combined light amount distribution in the imaging optical system using the multi-roof mirror array 33 shown in FIG. 15 is similar to that shown in FIG. It is desirable to use the roof mirror as an effective imaging area, and if the roof mirror portions 30a located at both ends of the multi-roof mirror array body 30 are used together, good imaging performance will not be obtained.

Therefore, in this embodiment, the multi-roof mirror array main body 3
In order not to use the dahama mirror portions 30a located at both ends of the diaphragm hood 38, that is, to make them non-effective reflective surfaces, the aperture holes 38a located at both ends of the aperture hood 38 are closed to form non-opening portions 39.

As explained above, according to the present invention, the structure is composed of a multi-lens array in which a large number of lenses are arranged in a straight line and formed into a plate shape, and a thin film at the peaks and valleys. In an imaging device equipped with a multi-roof mirror array in which a part of the multi-roof mirrors with uniform thickness is formed in a continuous plate shape, the roof mirror surfaces located at both ends of the multi-roof mirror array are made into ineffective reflective surfaces. The roof mirror surfaces having low flatness, which are part of the roof mirrors located at both ends of the multi-roof mirror array, are not used, and this has the effect that good imaging performance can be obtained over the entire effective imaging area.

In addition, since parts of the roof mirrors located at both ends of the multi-roof mirror array are not used, there is no need to consider the quality of both ends of the multi-roof mirror array.
It is also possible to obtain the effect of improving the productivity of the multi-roof mirror array.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional 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 a perspective view of a conventional imaging device. Imaging ray diagram of the imaging device, FIG. 5 is a perspective view of the multi-roof mirror array, and FIG. 6 is the V of FIG. 5.
7 is a schematic side view showing a recording device of a copying machine incorporating an imaging device, and FIGS. 8 to 14 show a first embodiment of the imaging device of the present invention, FIG. 8 is a partially omitted plan view of the multi-roof mirror array of the imaging device;
9 is a sectional view similar to FIG. 8, FIG. 10 is a partially enlarged sectional view of FIG. 9, FIG. 11 is a partially enlarged sectional view of the first modification of the multi-roof mirror array, and FIG. 13 is a cross-sectional view of a third modification of the multi-roof mirror array; FIG. 14 is a diagram showing the combined light amount distribution in the imaging device and its imaging optical system;
FIG. 15 is a diagram showing a second embodiment of the imaging device of the present invention and the combined light amount distribution in its imaging optical system. 30a, 40a, 50a, 60a...part of Dahamira,
33, 43, 53.63...Multi roof mirror array, 34...Multi lens array, 35...Aperture hole,
36... Aperture plate, 37... Non-opening section, 38...
Light-shielding hood, 38a° aperture hole - Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 0 Fig. 10 Fig. 11 Fig. 14 Fig. 15

Claims (3)

[Claims] (1) A multi-lens array in which a large number of lenses are arranged in a straight line and formed into a plate shape, and a multi-roof mirror in which a part of the roof mirror with uniform thickness at the peaks and valleys is connected and formed into a plate shape. What is claimed is: 1. An imaging device comprising a multi-roof mirror array, characterized in that a portion of the roof mirror surfaces located at both ends of the multi-roof mirror array are made into ineffective reflective surfaces. (2) The roof mirrors located at both ends of the multi-roof mirror array Some of the roof mirror surfaces are provided between the multi-lens array and the multi-roof mirror array, and are formed into a plate shape with a large number of aperture holes arranged in a straight line. The imaging device according to claim 1, characterized in that the diaphragm holes located at both ends of the diaphragm plate are closed and non-opening portions are provided to form non-effective reflective surfaces. . (3) The roof mirrors located at both ends of the multi-roof mirror array Some of the roof mirror surfaces are provided at the front of the multi-lens array, and are located at both ends of the aperture hood, which is formed into a plate shape by arranging a large number of aperture hexes in a straight line. 2. The imaging device according to claim 1, wherein the aperture hole located at the diaphragm hole is closed to provide a non-opening portion, thereby forming an ineffective reflective surface.