JPS63182963A - Led array light source - Google Patents

Abstract

PURPOSE:To emit light beams of plural kinds of color with one LED array by arraying plural light emitting elements whose wavelengths of emitted light beams are different from each other on the substrate of an LED array light source to impress voltages independently of each other. CONSTITUTION:The light emitting element 11 is an element(red) that emits red light, the same 12 is an element(blue) that emits blue light, and the same 13 is an element(green) that emits green light. To the respective light emitting elements 11-13 arrayed on the substrate 4, voltages can be independently impressed from the external. The beams of light emitted by the elements 11-13 are condensed by a condenser lens 2 fixed on the elements with a holder, and radiate the surface of an original located in front of the LED array light source. In such a way, the light emitting elements of different wavelengths of emission light are arrayed on the substrate, and voltages can be independently impressed to them, therefore, light beams of plural wavelengths can be emitted from one LED array light source.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical image reading device such as a facsimile machine or an OCR device, in which an LED illuminates the surface of a read document.
This invention relates to an array light source.

2. Description of the Related Art In recent years, there has been an increasing demand for high-intensity and compact LED array light sources as light sources for illuminating documents in image input devices and the like.

A conventional LED array light source will be described below with reference to the drawings.

Figure 2+a+, (bl shows the configuration of a conventional LED array light source, Figure 2(a) is a configuration diagram of the LED array light source, and Figures 2~) are diagrams showing an example of the configuration of the board. .

FIG. 3 shows an example of the configuration of an image reading section of an image reading device using a conventional LED array light source.

In Figure 2 (al), 5 is a light emitting element in the LED array light source, 2 is a condensing lens that functions to condense the light emitted from the light emitting element 5, 4 is a substrate on which the light emitting elements are arranged, and 3 is a light emitting element in the LED array light source. This is a holder that fixes the condensing lens onto the light emitting element.

In FIG. 2 (bl), 4 is a substrate on which light emitting elements 5 are arranged, and 5 is a light emitting element.

In FIG. 3, 8 is an LED array light source that illuminates the document surface, 9 is a lens system that collects the reflected light from the document surface illuminated by the 8 LED array light source, and 7 is the light that is focused by the lens system. It is a one-dimensional image sensor consisting of a plurality of photoelectric conversion elements that have the function of photoelectrically converting light, and 1o is a document.

The operation of the reading section configured as described above will be explained below.

Light emitted from the light emitting element by voltage application is collected by the lens system 9 and illuminates the surface of the document.

The reflected light from the document surface illuminated by the LED array light source has an intensity corresponding to the reflectance of the document surface, is focused by the lens system 9, and is converted into an electrical signal by the -dimensional image sensor, which converts the image information of the document. Can be read (
For example, Nikkei Electronics 1984.9.10
, pp. 161-194).

Problems to be Solved by the Invention Due to the characteristics of the light emitting elements, LED array light sources with a conventional configuration can only emit light of a single wavelength. ,
It is necessary to prepare three LED array light sources: red, blue, and green.

Means for Solving the Problems In order to solve the above problems, the LED array light source of the present invention arranges a plurality of types of light emitting elements with different emission wavelengths on the substrate of the LED array light source, and applies a voltage independently. By making this possible, a single LED array can emit light in multiple colors.

Effect of the present invention With the above-described configuration, it is possible to emit light of multiple types of colors with one LED array, and the LED
This makes it possible to downsize the array light source.

Example Below, regarding an LED array light source according to an example of the present invention,
This will be explained with reference to the drawings.

Figure 1 (al, (bl) shows the configuration diagram of the LED array light source of the present invention, Figure 1 +81 shows the LED array light source of the present invention.
FIG. 1 is a block diagram of the D-array light source (bl is the LED of the present invention)
FIG. 3 shows a diagram of a substrate on which light emitting elements of an array light source are arranged.

In Figure 1+81, 4 is a substrate on which light emitting elements are arranged;
Reference numeral 2 denotes a condensing lens that functions to condense light emitted by the light emitting element, 3 a holder that functions to fix the condensing lens on the light emitting element, and ■ the light emitting element.

In FIG. 1(b), 11 is a light emitting element that emits red light (red), and 12 is a light emitting element that emits blue light (blue).
, 13 is a light emitting element (green) that emits green light, and 4 is a substrate on which the light emitting elements 11, 12, and 13 are arranged.

The operation of the LED array light source configured as shown in FIGS. 1(al and bl) will be described below.

Each light emitting element 11, 12゜13 arranged on the substrate 4 is
Voltage can be applied to each independently from the outside.

The light emitted by the light emitting elements 11, 12, and 13 is focused by a condenser lens 2 fixed on the light emitting element by a holder, and illuminates the document surface of the document in front of the LED array light source.

In the case of a conventional LED array light source, all the light emitting elements on the substrate 4 are lined up with elements that only emit light of the same wavelength, and the LED array light source can only emit monochromatic light. Therefore, when performing color reading, it is necessary to use three red, blue, and green LED array light sources for illumination.

However, in the LED array light source of the present invention, multiple types of light emitting elements with different emission wavelengths are arranged on the substrate, and voltage can be applied to each independently. It is possible to emit a light of
Only one D-array light source is required.

Effects of the Invention As described above, the present invention provides an LED array light source in which a plurality of light emitting elements with different emission wavelengths are arranged on the substrate of the LED array light source and voltages can be applied independently. This allows the LED array to emit light of multiple colors.

[Brief explanation of the drawing]

FIG. 1+81 is a block diagram of an LED array light source according to an embodiment of the present invention, fbl is a block diagram of a substrate of the LED array light source of the present invention, FIG. 2 (al is a block diagram of a conventional LED array light source, (' b) is a configuration diagram of a board of a conventional LED array light source, and FIG. 3 is a configuration diagram of an image reading section. 1...Light emitting element group, 2...Condensing lens, 3 ...Holder, 4...Substrate, 5.
...Light emitting element group, 7...-dimensional image sensor, 8...12D array light source, 9...
...Lens system, 10...Manuscript, 11...
・Light emitting element (red), 12...Light emitting element (blue),
13... Light emitting element (green).

Claims (1)

[Claims] a substrate on which a plurality of light emitting elements are arranged; a condensing lens located on the plurality of light emitting elements and having a function of condensing light emitted by the light emitting elements; and fixing the condensing lens on the light emitting element. an LED array light source comprising a holder having the role of
Array light source.