JPS62102236A - Original illuminator for copying machine - Google Patents

Abstract

PURPOSE:To prevent the reduction of the quantity of light illuminating an original and the generation of a shadow on the leading edge of a copied substance by arranging a pair of concave submirrors for successively reflecting light obtained from a main condensing mirror to irradiate an original on a position opposed to the main condensing mirror in the horizontal direction and the upper position of the main condensing mirror. CONSTITUTION:Light X radiated from a halogen lamp 62 and reflected by the 1st (R1) area of the main condensing mirror 61 is irradiated to the illuminating area of an orignal D directly through a contact glass 14. On the other hand, light Y reflected by the 2nd (R2) area of the mirror 61 is reflected by the concave submirrors 63, 64 and irradiated to the illuminating area of the original D through the contact glass 14. Consequently, irradiation light to be irradiated to a part to be illuminated is prevented from interruption due to a white reflecting part 66 formed under the contact glass 14 and the generation of a shadow on the leading edge of a copied substance can be suppressed.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a document illumination device for a copying machine, and more specifically, it illuminates a document by effectively guiding light from a rod-shaped light emitting body to the document. The present invention relates to a document illumination device.

<Prior Art> Conventionally, in a copying machine, as shown in FIG. A sub-mirror (73) is installed facing the main condensing mirror (71) and the sub-mirror (73).
) is set so that light can be irradiated onto the original 1 (75) set on the contact glass (74) at opposite incident angles.

The reflected light from the original (75) is guided vertically downward, unnecessary portions are cut off by a slit (76), and the light is guided to an image processing section (not shown).

<Problems to be Solved by the Invention> With the document illumination device having the above configuration, in addition to illuminating the document (75) with the main light mirror (71), the document (75) can also be illuminated with the sub mirror (73). This has the advantage that the light emitted from the light emitter (72) can be efficiently used for illuminating the document.

However, in copying machines, it is common practice to form a margin of a predetermined width at the leading edge of the copy to improve the peeling performance of the copy paper from the photoreceptor drum and fixing roller. As a specific configuration, a configuration in which a white reflective portion (77) is formed on the lower surface of the contact glass (74) is adopted, so the sub-mirror (73
) to the original 1 (75), the original ( 75
), there is a problem that the amount of light irradiated on the paper differs significantly, resulting in so-called edge spots on the resulting copies. In addition, when the light irradiated from the sub-mirror (73) to the source 1 (75) is weakened, the light intensity of the light emitter (72) itself is increased in order to irradiate the source 1 (75) with a predetermined amount of light. The problem is that it needs to be done.

<Object of the invention> This invention was made in view of the above problems,
It is an object of the present invention to provide a document illuminating device that can prevent a reduction in the amount of light for illuminating a document and also prevent the occurrence of so-called blurred edges on the resulting copies.

Means for Solving Problems> In order to achieve the above object, the document illumination device of the present invention includes a main condensing mirror and a light emitting body, and has a main condensing mirror and a light emitting body substantially parallel to the main condensing mirror. position facing the direction,
and a sub-mirror positioned above the main condensing mirror, each of which sequentially reflects the light from the main condensing mirror and guides the light so as to irradiate the document in the same direction as the irradiation light from the main condensing mirror. It is something.

However, it is preferable that at least one of the sub-mirrors is a concave mirror, and both may be concave mirrors.

With the document illumination device configured as described above, a considerable portion of the light from the light emitter can be focused on the document set on the contact glass using the main condensing mirror, and the remaining light can be irradiated onto the document set on the contact glass. A predetermined portion of the light is guided from the main condensing mirror to a sub-mirror facing horizontally, and the light reflected by this sub-mirror is reflected by a sub-mirror located above the main condensing mirror, and the main condensing mirror The original can be irradiated in the same direction as the irradiation light from the mirror.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 2 is a schematic diagram showing the internal configuration of the copying machine.

(1) is the main body of the copying machine, the interior of which is divided into an upper chamber (12) and a lower chamber (13) by a partition plate (11), and an optical system for scanning and illuminating a document (D) in the upper chamber (12). (2), and a copy processing section (4) for forming a copy image on copy paper (P) and a copy paper transport section (8) are provided in the lower chamber (13).

Here, the optical system (2) includes a light source (21), a plane reflecting mirror (22) (23) (24), a lens (25),
and a plane reflecting mirror (26), and a light 11i (21)
, fl Yohi plane reflection v1. (22) (23) (24)
By moving in the direction shown by arrow A, the document (D) on the contact glass (14) can be scanned and illuminated. Then, the light source (21) and the plane reflecting mirror (22) move to a single plane, and the plane reflecting mirror (23N24)
) also move in one plane, and the moving speed of the former is set to be twice that of the latter. In the following explanation, the light source (21) and the plane reflector (22N23N
24) are collectively referred to as the optical section (2').

In addition, the copy paper conveyance section (8) includes a paper feed roller (81
), a paper feed path (83), a transport roller (85), a registration roller (86), a heat fixing roller (88), and an ejection roller (89), and by driving the paper feed roller, the paper feed cassette Take out a single sheet of copy paper (P) from (16), guide it to the copy processing section (4), transfer the toner image,
Although the configuration is such that the toner image is heated and fixed by the heating fixing roller (88) and then discharged onto the pedestal (18), the configuration is not limited to this configuration. It is also possible to use a copy paper conveyance section having other conventionally known configurations, such as a configuration in which the ejection sides are on the same side. The copy processing section (4) includes a charging unit (42), a blank lamp (B), a developing device (43), a transfer charger ( 44), separation member (45), and cleaner (46)
are arranged in this order, and an electrostatic latent image is formed by forming an original image on the outer surface of the photoreceptor drum (41), which is uniformly charged by a charging charger (42). After removing the static charge on the peripheral edge that has not been printed using a blank lamp (B), a developing device (43) develops it into a toner image, and a transfer charger (44) transfers the toner image onto copy paper (P). , residual toner cleaner (46
), but the present invention is not limited to this configuration, and it is also possible to use a copying processing section of other conventionally known configurations, such as one using a belt-shaped photoreceptor, for example.

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the document illumination device, which includes a main condensing mirror (61), a halogen lamp (62) as a light emitter, and a sub-mirror (θ3) (64). ing.

The main condensing mirror (61) is formed into a concave mirror shape as a whole, and a halogen lamp (62) is installed deep inside the main condensing mirror (61).
is installed. And the main condensing mirror (61)
The light X reflected by the first region (see R1 in the same figure) passes through the contact glass (14) as it is and reaches the document <
The main condensing mirror (
As shown in the figure, the light Y reflected by the second region (see R2 in the figure) of the contact glass (14)
) is oriented so that it is not directly irradiated. A sub-mirror (63) formed in a concave shape at the position where this light Y is irradiated
is attached, and the above light Y is sent to the main condensing mirror (6
1) A concave sub-mirror (64
), and the illumination area of the document (D) is irradiated through the contact glass (14).

Furthermore, direct light from a halogen lamp (62) also
Original placed on the contact glass (14) <D)
can be illuminated. Further, (65) is a slit formed between the main condensing mirror (61) and the sub-mirror (63), which can restrict the passage range of the reflected light from the source 1j (D). ing.

Also, regarding the so-called tip shadow, the source 4i (D) set on the contact glass (14) is illuminated by direct light from the halogen lamp (62) and the first light from the main condensing mirror (61). The contact glass (14 ) The white reflective portion (66) formed on the lower surface of the lamp does not block the irradiation light to the area that needs to be illuminated, and therefore, it is possible to completely prevent the occurrence of so-called tip shading.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, instead of using a curved reflecting mirror as the sub-mirror (63), it is possible to use a flat mirror J4.
It is possible to use a light emitting body other than a halogen lamp, and various other design changes can be made without departing from the gist of the invention.

<Effects of the Invention> As described above, the present invention can reliably prevent the occurrence of so-called tip shadowing by irradiating light from only one direction to a document set on a contact glass. Since the light from the main condensing mirror that does not directly illuminate the original is irradiated onto the original from almost the same direction as above, the light on the original surface can be maintained at a high level. center the effect of

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a document illumination device; FIG. 2 is a schematic diagram illustrating the internal mechanism of a copying machine; and FIG. 3 is a vertical cross-sectional view showing a conventional example. (14)...Contact glass, (61)...Main condensing mirror,

Claims (1)

[Claims] 1. It has a main condensing mirror and a light emitter. At the same time, the main condensing mirror and almost horizontally opposing positions, and main above each lens condenser mirror. The light from the in-focus mirror is reflected sequentially. , the same as the irradiation light from the main condensing mirror. A sub-mirror that guides light to illuminate the original in the direction Copy characterized by having a The machine's original illumination device. 2. At least one of the submirrors is a concave mirror According to claim 1 above, Copy machine document illumination device. 3. The above feature in which both submirrors are concave mirrors. Copying machine manuscript as set forth in claim 2 lighting equipment.