JPS61277252A - Contact type image sensor - Google Patents

Abstract

PURPOSE:To make a contact type image sensor small-sized and light-weight by providing a pair of optical fiber parts which irradiate the rays of light, which are emitted in point sequence from an LED array having plural LED elements, onto an original to be read and allow a photoelectric transducer to absorb the reflected light from this original successively. CONSTITUTION:LED elements 2, 2- of an LED array 1 are allowed to emit the rays of light in point sequence, and this light L1 is made incident on an optical fiber array 3 for illumination and is irradiated to an original 7 to be read in a spot. A reflected light L2 from the original 7 is made incident on an optical fiber array 4 for light reception and is absorbed successively by a photoelectric transducer 6. In this case, information on the original 7 is read by the reflected light L2. Since LED elements 2, 2- of the LED array 1 are used as the light source for the photoelectric transducer 6, the photoelectric transducer 6, circuit patterns of wiring and sensor driving IC, electric connection to the external, etc. are simplified, and the image sensor is made inexpensive, small-sized, and light-weight.

Description

Detailed Description of the Invention - Industrial Application Field The present invention relates to a contact type image sensor used in facsimile machines, image scanners, etc., and in particular uses a light emitting diode array (hereinafter referred to as an LED array) as a light source. The present invention relates to a contact type image sensor.

・Conventional technology A conventional contact image sensor irradiates a document with light emitted from a light source such as an LED, a fluorescent display tube, or a fluorescent lamp, and passes the reflected light from the document through a rod lens array. The photoelectric transducer array is configured to absorb the information into the photoelectric conversion element array and read the information on the document.

-Problems to be Solved by the Invention However, with this configuration, a rod lens array is used as a means for absorbing reflected light from the original into the photoelectric conversion element, and the focal length of the rod lens array is usually 5. ~101 m, it is necessary to place the original and the photoelectric conversion element array at the upper and lower parts of the rod lens array at positions separated by 5 to 10 mm, which has the disadvantage of increasing the size of the device housing. there were.

Furthermore, since a photoelectric conversion element array is used, the photoelectric conversion element array, circuit patterns such as wiring and sensor driving IC, and electrical connections with the outside are complicated and expensive.

In view of the above-mentioned conventional problems, the present invention has been made with the object of providing a contact type image sensor that is inexpensive, small and lightweight.

・Means for solving the problem The contact type image sensor of the present invention uses an LED array as a light source and guides the light using an optical fiber), and has a plurality of light sources for the photoelectric conversion element. By the way, LE
The D array is dot-sequentially emitted to read the surface of the document.

That is, an LED array having a plurality of LED elements and light emitted point by point from the LED array are irradiated onto a document to be read, and light reflected from the document to be read is sequentially absorbed by a photoelectric conversion element. It is equipped with a pair of optical fiber sections.

・Function The contact image sensor with the above configuration causes the LED array to emit light in a dot-sequential manner, irradiates the light onto a spot on the document using a pair of optical fiber sections, and transmits the reflected light from the document to a photoelectric conversion element. By sequentially absorbing the light, information on the document can be read based on the amount of reflected light. Then, by changing the irradiation position on the document depending on the position of the LED element that emits light, it is possible to read a partial area on the document surface.

Therefore, it is possible to eliminate the conventional Rondo lens array and photoelectric conversion element array.

·Example Embodiments of the present invention will be described below based on the drawings.

1 and 2 are diagrams showing one embodiment of the present invention, FIG. 1 is an explanatory diagram of a contact type image sensor, and FIG. 2 is an illustration of an L
3A and 3B each show a schematic perspective view of an ED array.

In FIGS. 1 and 2, 1 is a LIED array, 2
・-・-2 is an LED element arranged in the LED array 1 at an interval of, for example, 0.06 squares, and 3 is one end of the LED array 1.
An illumination optical fiber array 4 corresponds to the LED element 2---2 and has its other end placed on the original 7 to be read; A light-receiving optical fiber array 5 corresponds to the photoelectric conversion element 6 and has the other end arranged on the photoelectric conversion element 6, and 5 has the illumination optical fiber array 3 and the light-receiving optical fiber array 4 fixed by welding or adhesive, and also connects the LED array 1 and the photoelectric conversion element. Fig. 6 shows fiber plates arranged in close contact with each other.

In such a configuration, as shown in FIG. 1, the LED elements 2 .
(in a direction perpendicular to the drawing), the tip L1 enters the illumination optical fiber array 3 and illuminates the original to be read 7 as a spot. Then, the reflected light L2 on the original to be read 7 is allowed to enter the light-receiving optical fiber plate 4 and is sequentially absorbed by the photoelectric conversion element 6. At this time, information on the original to be read 7 can be read based on the amount of reflected light L2.

According to such a configuration, the LE
Since the LED elements 2- and -2 of D array 1 were used as the light source,
The circuit patterns of the photoelectric conversion element 6, wiring, sensor driving IC, etc., and electrical connections with the outside can be simplified. By guiding light through the optical fiber 3.4, the conventional Rondo lens array can be abolished, and the sensor device can be made smaller and lighter.

・Effects of the Invention As explained in detail above, the contact image sensor of the present invention causes the LED array to emit light in a dot-sequential manner, irradiates the light to a spot on the document using a pair of optical fiber sections, and The reflected light above is absorbed by a photoelectric conversion element, and the information on the document can be read based on the amount of reflected light.

Then, it is possible to read a partial area of the document surface by changing the irradiation position on the document depending on the position of the LED element that emits light. Therefore, the conventional Rondo lens array and photoelectric conversion element array can be eliminated, making it possible to reduce the size and weight at low cost.

[Brief explanation of the drawing]

1 and 2 are diagrams showing one embodiment of the present invention, FIG. 1 is an explanatory diagram of a contact type image sensor, and FIG. 2 is an illustration of an L
FIG. 2 is a schematic perspective view of an ED array. 1--1--LED array, 2--LED element, 3-- Optical fiber array for illumination, 4--
--- Optical fiber array for light reception, 5 --- fiber plate, 6 --- one photoelectric conversion element, 7.-
---One original to be read. l-LED a5. Fiber 6: Photoelectric conversion 7: #L Hirotohara Figure 1 Figure 2 Reiko fiber array 72 Ivar array 1 Great element

Claims (1)

[Claims] (1) A light-emitting diode array having a plurality of light-emitting diode elements, the light emitted from the light-emitting diode array dot-sequentially illuminates the document to be read, and the light reflected from the document to be read is transmitted to a photoelectric conversion element. A close-contact image sensor equipped with a pair of optical fiber sections that sequentially absorb light.