JPH01149673A - Reader - Google Patents

Abstract

PURPOSE:To scale down a reader and to make the adjustment of it unnecessary by providing the array of LED three elements made to be colored red, blue and yellow, a microlens formed on the emitted part of the LED element of a transparent insulating film and a photodiode being at the lower direction of the LED array. CONSTITUTION:The LED 1 and the photodiode 19 are formed by a (p) layer 5, (n) and (p) layers 9 and a (n) layer 10, the electrodes 12 of them is connected to a three color LED driving circuit 13 or an analogue/digital data conversion circuit 14 and the output of the data conversion circuit 14 is inputted to a main data memory 15 for a display screen. Besides, the plural sets of the LED array 1 are arranged in a line by making a yellow LED 16, a blue LED 17 and a red LED 18 as one dot. The LED array 1 and the photodiode 19 are united in one body by the transparent insulating film 2 and the microlenses 4 and 5 are respectively formed on the front surface of the LED aray 1 and the photodiode 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reading device for reading image characters and the like of a document, and particularly to an image sensor thereof.

[Conventional technology]

Conventionally, this type of reading device uses an image sensor that integrates a light emitting section, a condensing lens that focuses light from the light emitting section onto a document, and a photoelectric conversion element that receives reflected light from the document. It consists of an analog-to-digital conversion circuit that digitizes and outputs the electric signal converted by the photoelectric conversion element, and a driving circuit for the light emitting part, and generally uses a SELFOC lens array as the lens.

Therefore, due to the size of this lens, it cannot be made compact, and it takes time to adjust the base point of the light emitting part and the lens. Another drawback is that the light emitting section is monochromatic, making it impossible to read color images.

[Problem that the invention seeks to solve]

The object of the present invention is to provide a reading device that solves the above-mentioned drawbacks, namely, the problem that the light emitting part and the condensing lens are combined, resulting in a large size and difficult adjustment, and also the problem that it is not possible to read color images. It is about providing.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an LED array in which a plurality of sets of three LED elements emitting red, blue, and yellow colors are arranged in a row, and each LED of this LED array is
A transparent insulating film is provided on the top surface of the device and has microlenses formed inside that correspond to the individual light emitting elements, a photodiode array is also formed in a row below the LED array, and the analog data of this photodiode is converted into n-bit digital data. This system employs a configuration consisting of an analog/digital data conversion circuit that converts the data into serial data and outputs it as serial data.

[Effect]

Since the present invention is configured as described above, the light from each set of three LED elements is focused on the same point on the document by the corresponding microlens. Therefore, L for red, blue, and yellow
By sequentially emitting light from the ED for scanning, the reflected light is detected by a photodiode and output as a serial digital signal by an analog/digital data conversion circuit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, which shows an embodiment of the present invention in a longitudinal cross-sectional view and a circuit configuration diagram, the reading device of the present invention includes an image sensor portion having an LED array 1 and a photodiode array 19, and a three-color LED driving circuit 13. , an analog/digital data conversion circuit 14, and the irradiated light from the LED array 1 is reflected by the document 7 and received by the photodiode 19.

In addition, the LEDI and photodiode 19 have nine layers 5, n
9 layers 9, n-layers IO, and each electrode 1
2 is 3i! It is connected to an ILED drive circuit 13 or an analog/digital data conversion circuit 14, and the output of this data conversion circuit 14 is input to a main data memory 15 for the screen.

Furthermore, the LED array 1 includes a yellow LED 16 as shown in FIG.
A plurality of sets are arranged in a line, with blue LED 17 and red LED 18 as one dot. Further, in parallel thereto, a photodiode 19 is formed for each dot. The LED array 1 and the photodiode 19 are integrally coupled by a transparent insulating film 2, and microlenses 4 and 3 are formed in front of the LED array 1 and the photodiode 19, respectively.

Figure 3 shows a red LED 18 and a blue LED 17 inside the transparent insulating film 2.
, microlenses 4 formed in front of the yellow LEDs 16 are shown.

Next, the operation of this embodiment will be explained.

By sequentially scanning each LED using the three-color LED drive circuit 13 as shown in FIG. 4, the reflected light is detected by the photodiode 19, and the detected analog signal is sent to the analog/digital data converter 14. The data is converted into a digital signal and stored in the screen main data memory 15 inside or outside the device.

Therefore, there is an advantage that the image sensor can be made small and that color images can also be read.

Note that the microlens 3 in front of the photodiode 19 may not be used.

〔Effect of the invention〕

As explained above, according to the present invention, there is a transparent insulating film on the front surface of the seven rays of the three LED elements that emit red, blue, and yellow colors, and the transparent insulating film is formed on the light emitting part of the LED element. The LED elements are sequentially scanned by having a microlens that is parallel to the LED array, and a photodiode located below the LED array, and the analog data of the photodiode that detects this reflected light is converted into digital data, which is then converted into n bits. The three-color digital image data has the effect of being able to be input into the main data memory for the screen to read a color image.

Furthermore, since the microlens is built into the transparent insulating layer, the size is small, and there is no need for adjustment for combining another lens.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view and a configuration diagram of an embodiment of the present invention, Fig. 2 is a partial front view of Fig. 1, Fig. 3 is a partial cross-sectional view of Fig. 1, and Fig. 4 is a sequential view of LEDs. FIG. 3 is a scanning timing diagram. 1...LED array, 2...Transparent insulating film, 3...Microlens, 4...Microlens, 5...P layer (LED), 6...
...n layer (LED), 7...manuscript, 8...
...Transparent insulating film, 6...P layer (photodiode), 10...N layer (photodiode), 1
1...Transparent insulating film, 12...Electrode, 1
3...3-color LED drive circuit, 14...
・Analog/digital conversion circuit, 15...Main data memory, 16...Yellow LED, 17.
...Blue LED, 18...Red LED, 19
・・・・・・Photodiode. Agent Patent Attorney Oto Uchihara ゛、／／
Do,, 2 To 2 Reading BF4 Zetsurou Puyaku 3 Diagram

Claims (1)

[Claims] An image sensor having a light emitting section, a condensing lens, and a photoelectric conversion element that receives reflected light from a document, an analog-to-digital conversion circuit that digitizes an output electrical signal of the photoelectric conversion element, and a drive circuit for the light emitting section. A reading device comprising: a light emitting section comprising an LED array in which a plurality of sets of three LED (light emitting diodes) elements are arranged in a row to cause the image sensor to emit red, blue, and yellow; A macro lens is formed at a position corresponding to each of the LED light emitting elements to form a transparent insulating film as a condensing lens, and a photoelectric conversion element array such as a photodiode is formed in parallel below the LED array. A reading device characterized by: