JPS6188659A - Lighting device - Google Patents

Abstract

PURPOSE:To light the illuminance of an original face uniformly and efficiently by constituting the titled device with a rod-shaped solid-state light source, photoelectric converting elements arranged in a line and a focusing fiber array and incorporating the fiber array and a light guide for transmission original lighting. CONSTITUTION:The irradiated light by the rod solid-state light source 5 such as an LED is led through the transmission original lighting light guide 8 and irradiated onto the original face of a transmission original 1. The image of light irradiated on the original face is formed on a point B of the transmission original 1 and a point A of the photoelectric converting element group 7 through the focusing fiber array 6 and the contrast of a character or a graph on the original face is outputted as a time series signal by using the photoelectric converting element group 7. Since the light guide 8 has a structure adhered closely to the outside of the focusing fiber array 6 in this way, miniaturization is attained, the light is irradiated vertically to the original face and irradiated efficiently even if the focus of the focusing fiber array 6 is shortened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to a 4-scan reading system, a 4i copying machine, an O
The present invention relates to an illumination device that uses CR equal pressure and illuminates the surface of a document uniformly and efficiently.

[Conventional technology]

A conventional document reading system in this building is shown in FIG. 5. A tungsten lamp or a fluorescent lamp was often used as a light source for illuminating the document. In particular, fluorescent lamps are widely used because they generate little heat, can easily produce a linear light source that is as long as the width of the transmitted document, and have minute light emission characteristics close to human visibility. ing.

Illumination light emitted from a fluorescent lamp 2 is irradiated onto the transmission document 1,
The reflected illumination light is focused by a lens 3 and guided to a photoelectric conversion device 4, where electrical signals are output in time series according to the brightness of the image. The photoelectric conversion device 4 is a CCD
, MOS, etc. are used.

However, since the fluorescent lamp 2 has a phenomenon in which both ends of the tube become dark, attempting to uniformly illuminate the entire width of the 1N document 1 requires a fluorescent lamp approximately twice as long, making the device larger. There are drawbacks.

On the other hand, a rod-shaped LED light source is used as the illumination light source, and the transmitted original 1
FIG. 6 shows a conventional document reading system that corresponds to 1=1 and is miniaturized.

In this method, a transmission original 1 is illuminated by a rod-shaped solid-state light source 5 such as an LED, and the reflected light is transmitted to a focusing fiber array 6.
It is sent to the photoelectric converter group 1 through the photoelectric converter group 1, and the characters 9 and figures drawn on the surface of the document are outputted as strokes 1 and 1. The photoelectric conversion string group 7 uses thin film photoelectric conversion elements such as CdS-CdSe, or 81 elements such as CCD and M'O8.

[The problem that the invention attempts to solve]

According to the conventional method as described above, the rod-shaped solid-state light source 5 that illuminates the transmitted document 1 needs to illuminate at an angle of about 45 degrees with respect to the surface of the document. If the distance is short, the width with respect to the document surface becomes narrow, resulting in disadvantages such as the inability to effectively irradiate the illumination light source.

The present invention has been made in order to solve these conventional drawbacks, and provides an illumination device that can be miniaturized and can uniformly and efficiently illuminate the surface of a document. The purpose is to

[Means for solving problems]

The illumination device according to the present invention includes a rod-shaped solid-state light source, a group of photoelectric conversion elements arranged in a linear manner, and a focusing fiber array, and the focusing fiber array and a light guide path for illuminating a transmitted document are connected to each other. It is integrated.

[Effect]

In this invention, light from a rod-shaped solid-state light source passes through a light guide path and illuminates a transmission document, and the reflected light is incident on a group of photoelectric conversion elements via a focusing fiber array, where it is photoelectrically converted. At this time, the light guide path is integrated with the focusing fiber array to illuminate a desired portion of the transmitted document.

〔Example〕

FIG. 1 shows one embodiment of the present invention, and is a sectional view of a reading abrasion optical system. In this figure, 1 is a transmission document, 5 is a rod-shaped solid-state light source, 6 is a focusing fiber array, and 7 is a group of photoelectric conversion strings. 8 is a light guide path for illuminating the transmission document;
It consists of a transparent glass plate or a transparent plastic plate.

Reference numeral 9 denotes a light-shielding layer for preventing light from leaking to the outside, and is made of a black or vapor-deposited reflective film to effectively guide illumination light onto the document surface. The configuration of this optical system is such that a light guide path 8 for illuminating a transmitted document is arranged perpendicularly to the surface of the document, and a focusing fiber array 6 is provided inside the light guide path 8 .

Next, the operation will be explained.

Illumination light emitted by a rod-shaped solid-state light source 5 such as an LED is guided by a light guide path 8 for illuminating the transmitted document in the direction shown by the arrow, and is irradiated onto the document surface of the sent 4N document 1. The source irradiated onto the document surface is imaged by the focusing fiber array 6 to point B of the transmission document 1 and point A of the photoelectric conversion element group 7, and the brightness and darkness of the character 0 figure etc. on the document surface is converted to the photoelectric conversion element group. Output as No. 46, which is more chronological than IK. Since the light guide path 8 for illuminating the transmitted document is closely attached to the outside of the focusing fiber array 6, its advantages include miniaturization, the ability to irradiate perpendicular to the document surface, and the ability to focus Even if the focal length of the optical fiber array 6 is shortened, effective illumination can be achieved.

FIG. 2 shows a sectional view of another embodiment of the invention.

In this figure, the same or corresponding parts as in FIG. 1 are designated by the same reference numerals. The embodiment shown in FIG. 2 has a configuration in which a light guide path 8 for illuminating a transmission document is provided in the center of a focusing fiber array 6. However, 11 is a side plate that supports the focusing fiber array 6.

This reading optical system is applied to a method of reading two lines, and points B on the transmission document 1 and photoelectric conversion element group 1.
A point A is imaged by a focusing fiber array 6. Further, the photoelectric conversion element #1 is distributed to both sides by a mirror 10. Light emitted by a bar-shaped solid-state light source 5 such as LIitD passes through a light guide path 8 for illuminating the transmission original in the direction shown by the arrow, and illuminates point B of the transmission original 1. The reading method is performed in the same manner as shown in #l311.

FIG. 3 is a sectional view showing still another embodiment of the invention. In this embodiment, the tip portion 8-1 of the light guide path 8 for illuminating the transmitted document is made into a lens shape, and the transmitted document 1 (J,) is formed into a lens shape.
Condensing light at point B: J: There is only one sea urchin.

This also makes it possible to increase the illumination intensity of the illumination light that illuminates the document surface, and also to increase the intensity of the illumination light that illuminates the document surface.
It is possible to reduce the size by integrating with the ζ).

FIG. 4 shows another embodiment of the light guide path 8 for illuminating the transmitted document.
A perspective view is shown. End surface 8-2 of light guide path 8 for illuminating transmitted document
A solid-state light source such as a chip-shaped L IHD is mounted on a glass plate.
1 are arranged in a line to form a rod-shaped solid-state light source, and are integrated with a light guide path 8 for illuminating a transmission document.

〔Effect of the invention〕

As explained above, this invention integrates the light guide path for illuminating the 1D manuscript and the focusing 7-ray, so that the illumination light can be applied perpendicularly to the document surface, and the leakage light can also be illuminated. It is possible to reduce the illuminance on the document surface by 1000 yen and effectively reduce the illumination. Further, it has many advantages, such as miniaturization and uniform illuminance on the surface of the document.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIGS. 2 and 3 are sectional views showing still other embodiments of the invention, and FIG. 4 is a sectional view of a light guide path for illuminating a transmitted document. FIG. 5 is an external perspective view showing another embodiment. FIG. 6 is a diagram for explaining the conventional reading method. In the figure, 1 is a transmission document, 5 is a bar-shaped solid-state light source, 5-1 is a solid-state light source such as a chip-shaped LED, 6 is a focusing fiber array, 7 is a group of photoelectric conversion elements, and 8 is a light guide path for illuminating the transmission document ,
8-1 is a tip, 8-2 is an end surface, 9 is a light shielding layer, 10 is a mirror, and 11 is an 1I4o plate. Figure 1 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) A rod-shaped solid-state light source that illuminates the transmission document, a group of photoelectric conversion elements arranged in a linear manner, and a focusing fiber array that forms an image of the transmission document to be read on the light receiving part of the photoelectric conversion element group. An illumination device configured to be used in a photoelectric conversion device that receives reflected light of illumination light from the rod-shaped solid-state light source and photoelectrically converts the reflected light from the rod-shaped solid-state light source in close proximity to the transmission document, the illumination device being integrated with the focusing fiber array to detect the transmission document. A lighting device characterized by providing a light guide path for lighting. (2) The tip of the light guide path is curved so that the light passing through the light guide path for illuminating the sent document is focused on the reading position. lighting equipment. (3) The illumination device according to claim (1), characterized in that a rod-shaped solid-state light source is arranged on an end face of a light guide path for illuminating a transmission document, and is integrated with the light guide path for illuminating a transmission document. .