JPH06138561A - Reflecting mirror for illuminating original for copying machine - Google Patents

Abstract

PURPOSE:To enhance the illuminating efficiency of a light source by irradiating an original illumination part with light leaking from an opening part installed behind a light source for a reflecting mirror and also light reflected on the other part of the reflecting mirror through a plane mirror and a 3rd elliptical mirror. CONSTITUTION:In the case of designing the mirror so that the reflection light of the light source 2 may be converged on one point of the original illumination part 3, the opening part 10 is installed behind the light source 2 for the reflecting mirror 1 (connecting part of a 1st elliptical mirror part 4 and a 2nd elliptical mirror part 6), and the 2nd plane mirror 11 is installed behind the opening part 10. And the mirror image of the light source 2 made by the 2nd plane mirror 11 is a 1st focus and the original illumination part 3 is a 2nd focus, and then, a 3rd ellipse is formed. A part of the 3rd ellipse becomes a 3rd elliptical mirror 13, and then, the light emitted from the light source 2 and leaking from the opening part 10 is guided to the 3rd elliptical mirror 13 through the 2nd plane mirror 11 so as to be converged on the original illumination part 3. Thus, the illuminating efficiency can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector for illuminating an original in a copying machine, which can improve the effect of irradiating the original illuminating section with reflected light from a light source.

[0002]

2. Description of the Related Art A reflector for illuminating an original in a copying machine is
The property of an ellipse that light emitted from the first focus is focused on the second focus is used. FIG. 1 shows a conventional reflecting mirror 1. The reflecting mirror 1 reflects the reflected light of the light source 2 from one side to the original illuminating unit 3 in the direction connecting the light source 2 of the copying machine and the original illuminating unit 3. It comprises a first elliptical mirror portion 4 for guiding and a second elliptic mirror portion 6 for guiding the reflected light from the other side to the original illuminating section 3 via the first plane mirror 5 (or curved mirror). Reference numeral 7 is a document placing glass.

[0003]

In the conventional reflecting mirror 1, the light effectively condensed by the reflecting mirror 1 is α ° + β °, and the rear portion of the light source 2 is the original illuminating section. It is a blind spot for 3 and is not being effectively used. The light directed to the rear portion, which is the blind spot, is reflected in the reflecting mirror 1 and absorbed / diffused by the light source 2 so that it is not effectively focused on the document illumination unit 3. As described above, the above-mentioned conventional example has a limit in illumination efficiency.

The present invention has been made in view of the above points, and an object of the present invention is to provide a reflecting mirror for illuminating an original in a copying machine, which can improve the illumination efficiency of a light source.

[0005]

In order to achieve the above object, a reflecting mirror for illuminating a document in a copying machine according to the present invention is provided on one side with respect to a direction connecting a light source of the copying machine and a document illuminating section. Document illumination in a copying machine including a first elliptical mirror portion that guides the reflected light from the light source to the document illumination portion and a second elliptical mirror portion that guides the reflected light from the other side to the document illumination portion via a flat mirror or a curved mirror. And a third elliptical mirror for guiding the reflected light to the original illuminating section through the plane mirror, and the plane mirror is provided for the opening in the rear of the light source of the reflector. Has become. And again, in the reflecting mirror for illuminating the original in the copying machine,
A reflecting mirror such as a curved mirror or a plane mirror is further provided above the reflecting mirror such as a plane mirror or a curved mirror forming a pair with the second elliptical mirror.

[0006]

[Operation] The light from the opening provided behind the light source of the reflecting mirror is radiated to the original illuminating section through the plane mirror and the third elliptical mirror together with the light reflected by the other part of the reflecting mirror. .

[0007]

EXAMPLE An example of the present invention will be described with reference to FIGS. In this embodiment, the same members as those of the conventional example shown in FIG. FIG. 2 shows the first embodiment of the present invention. As in the conventional example shown in FIG.
The case where it is designed to be focused on one point is shown.

An opening 10 is provided in a portion of the reflecting mirror 1 behind the light source 2 (a continuous portion of the first elliptical mirror portion 4 and the second elliptic mirror portion 6), and a second plane mirror 11 is provided behind the opening 10. Set up. Then, the mirror image of the light source 2 formed by the second plane mirror 11 can be used as the first focal point, and the document illumination unit 3 can be used as the second focal point to form the third ellipse 12. A part of the third ellipse 12 is used as a third ellipse mirror 13, and the light of the light source 2 leaked from the opening 10 is guided to the third ellipse mirror 13 through the second plane mirror 11 and condensed on the original illumination unit 3. Let

FIG. 3 shows a second embodiment of the present invention. When the reflected light from the third elliptic mirror 13 is focused on the document illumination section 3 when the incident angle is small, the document placing glass is placed. 7
Is reflected by the curved mirror 14 on the upper side of the first plane mirror 5.
Is provided, and the reflected light from the original placing glass 7 is condensed again on the original irradiating section 3 by the curved mirror 14. The curved mirror 14 may be formed by extending the first plane mirror 5, and a plane mirror may be used although the light collection efficiency is reduced.

[0010]

The reflection area in each of the above embodiments is α ° + β ° + γ ° by adding the reflection area γ ° of the second plane mirror 11 to α ° and β ° of the conventional example, and the amount of light behind the light source is also effectively used. I can do it now. When the numerical values are verified according to the above embodiment, α = 100 °, β = 115 °, γ =
It became 30 °, and the light amount increased by about 14%. Although the amount of increase in the amount of light varies depending on the shape of the reflecting mirror, the present invention can improve the illumination efficiency. When the brightness of the document illumination unit is the same, the brightness of the light source can be reduced and power consumption can be saved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a conventional example.

FIG. 2 is a vertical sectional view showing an embodiment of the present invention.

FIG. 3 is a vertical sectional view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reflective mirror, 2 ... Light source, 3 ... Original illuminating section, 4, 6 ... First and second elliptical mirror sections, 5, 11 ... First and second plane mirrors, 7 ... Original placing glass, 13 ... 3 elliptical mirrors, 14
… Curved mirror.

Claims (2)

[Claims] 1. A first elliptical mirror portion that guides the reflected light of the light source to the original illumination unit from one side with respect to the direction connecting the light source of the copying machine and the original illumination unit, and a plane mirror that reflects the reflected light from the other side. In a reflecting mirror for illuminating a document in a copying machine, which comprises a second elliptical mirror portion guided to a document illuminating section via a curved mirror, an opening is provided in the rear of the light source of the reflecting mirror, and a plane mirror is provided for the opening. A reflecting mirror for illuminating a document in a copying machine, comprising a third elliptical mirror for guiding reflected light to the document illuminating section via the plane mirror. 2. A copying machine according to claim 1, wherein a reflecting mirror such as a curved mirror or a flat mirror is further provided above the reflecting mirror such as a flat mirror or a curved mirror forming a pair with the second elliptical mirror portion. A reflector for illuminating documents.