JPS6251364A - Picture reader - Google Patents

Abstract

PURPOSE:To attain the reading of optional part of an original by applying the subscanning of reading manually so as to attain the miniaturization and light weight of the reader. CONSTITUTION:In reading an original 3, a semiconductor memory unit 2 is mounted onto the reader 1 and the reader 1 is set onto the original 3 (an image sensor 14 is made coincident with the transverse direction of the original 3). Then the power supply of the reader 1 is turned on and the reader 1 is moved slowly from the upper end to the lower end of the original 3 manually. The original image within the reading width of the image sensor 14 is formed onto the image sensor 14 via a lens array 12 and a mirror 13, and picture information subjected to photoelectric conversion is stored in the semiconductor memory unit 2. In desiring to read the specific part of the original 3, the reader has only to be moved to the part only. Since the width read by the image sensor 14 is limited to the read width of the sensor 14, it is required to make subscanning by moving the reader 1 itself and a position detection section is built in the reader 1 to decide the position of the subscanning.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image reading device that is small and lightweight and that is capable of reading any part of a document.

[Conventional technology]

A conventional image reading device includes, for example, a platen on which a document to be read is placed, a reading optical system (a light source for illumination, an optical lens that forms an image of light reflected from the surface of the document, and an image obtained through the optical lens). (composed of a photoelectric conversion element such as a COD that photoelectrically converts an image) is moved relatively and automatically (for example, moved at a constant speed in the longitudinal direction of the document), and the image is sequentially scanned in the width direction. However, there is a device that reads the image optically, converts it photoelectrically, and stores the image information in a memory built into the device. The image information stored in the memory can be read out at any time, and the image can be reproduced by supplying data to a printer unit integrated into the image reading device or an external printer and printing it.

[Problem that the invention seeks to solve]

However, conventional image reading devices require a drive mechanism to move the platen and optical system relative to each other, making the device large and heavy, making it difficult to handle. Since the entire surface of the document is scanned, it is not possible to scan and read only an arbitrary part.

[Means and effects for solving the problems] The present invention has been made in view of the above, and in order to reduce the size and weight of the document and to be able to read any part of the document, the sub-scanning for reading is manually performed. The present invention provides an image reading device that can perform the following operations.

〔Example〕

Hereinafter, an image reading device according to the present invention will be explained in detail.

1 and 2 show the appearance and the arrangement of the optical system of an embodiment of the present invention, in which a document 3 to be read is sequentially scanned and read in every predetermined width, and the image signal is decomposed into pixels and each A reading device 1 that outputs a binary signal according to a pixel and to which a semiconductor memory unit 2 can be detachably attached, and a reader device 1 that can be detachably attached to each of the device 1 and a printer as an external connection device (not shown). It is composed of a card-shaped semiconductor memory unit 2, into which image information is written when attached to a reading device 1, and only read when attached to a printer.

As shown in FIG. 2, the optical system built into the reading device 1 includes an illumination light source 11 using a fluorescent lamp, an LED array, etc. that illuminates the reading surface of the document 3, and a light source 11 that uses light reflected from the surface of the document 3 due to the illumination. a lens array 12 that forms an image on the light receiving surface of the image sensor 14; a mirror 13 that reflects the light from the lens array 12 onto the light receiving surface of the image sensor 14;
An image sensor 14 configured using a photodiode array such as a CCD or amorphous silicon that receives and photoelectrically converts a light image from 3, and outputs an electric signal by digitizing the received light image for each bit; The control circuit 15 displays the obtained image information on a liquid crystal display or the like and controls writing to the semiconductor memory unit 2.

Incidentally, a rubber roller is mounted on the bottom surface of the reading device 1 for driving a rotary encoder that constitutes a position detection section, which will be described later. Further, the semiconductor memory unit 2 is
Battery and CMOS static R for bank up
It is configured in combination with non-volatile memory such as AM or EEFROM, and is used in the form of a card. Writing to this semiconductor memory unit 2 is performed in synchronization with a clock signal (output from the position detection section), but the image information is
As shown in the figure, after the output signal of the image sensor 14 is amplified by the amplifier 16, only the signals in which the output signal of the amplifier 16 exceeds the reference voltage E are outputted from the comparator 17, and this comparator output is synchronized with the clock signal. and is written into the semiconductor memory unit 2.

In the above configuration, when reading the original 3, the semiconductor memory unit 2 is attached to the reading device 1, and the reading device 1 is placed over the original 3 (the image sensor 14 is aligned in the width direction of the original 3).

Next, the power of the reading device 1 is turned on, and the reading device 1 is manually moved slowly from the upper end to the lower end of the document 3. The document image within the reading width of the image sensor 14 is transmitted to the lens array 12. Image sensor 1 via mirror 13
4 and photoelectrically converted image information is stored in the semiconductor memory unit 2.

Note that if it is desired to read a specific part of the document 3, the reading device may be moved only to that part.

Since the width read by the image sensor 14 is limited to the reading width of the sensor 14, it is necessary to move the reading device 1 itself to perform sub-scanning. A position detection section is built into the reading device 1 to determine the position of this sub-scanning.

FIG. 4 shows the configuration of the position detection unit, which is rotated by the driving force transmitted via the rubber roller 5 that presses against the three surfaces of the document via the rubber belt 7 and the rubber belt 7, and generates a pulse signal in accordance with the rotation. a rotary encoder 6,
It is composed of a rubber belt 7 that is loaded between the encoder 6 and the rubber roller 5 and rotates as the reading device 1 moves on the document surface.

In the above configuration, when the reading device 1 set on the original 3 is moved, the rubber belt 7 rotates due to the friction between the rubber belt 7 and the original 3.

The rotational force of the comheld 7 is transmitted to the rotary encoder 6, and the rotary encoder 6 rotates. The rotary encoder 6 generates pulse signals at intervals depending on the rotation speed. This pulse signal serves to determine the resolution of the reading device 1.

That is, when the resolution is high, the number of pulses per moving distance increases, and when the resolution is low, there are fewer pulses.

The image information stored in the semiconductor memory unit 2 can be monitored bit by bit using a liquid crystal display or the like (not shown) attached to the reading device 1.

Furthermore, the image can be reproduced by removing the semiconductor memory unit 2 from the reading device 1, inserting it into a printer or the like (or connecting it via an adapter), reading it out, and printing it.

In FIG. 2, the light exiting the lens array 12 is reflected by the mirror 13, but the mirror 13 can be removed as shown in FIG.

In this case, the image sensor 14 is of a contact type and is placed close to the lens array 12.

Further, for the lens array 12, optical lenses other than the array type can also be used. Furthermore, although a rotary encoder is used as the position detection section, any other device can be used as long as it is capable of emitting electrical pulses in accordance with the moving distance.

〔Effect of the invention〕

As described above, according to the image reading apparatus of the present invention, sub-scanning is performed manually, so that the apparatus can be made smaller and lighter, and it is also possible to read any part of a document.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIG. 3 is a block diagram showing an example of a signal processing system according to the present invention; FIG. 4 shows a schematic configuration of a position detection section applied to the embodiment shown in FIG. 1. FIG. 5 is a front view and a layout diagram showing another example of the optical system. Explanation of symbols 1--Reading device, 2-----m-Semiconductor memory unit, 3--
-----One original, 5-...Rubber roller,
6---------Rotary encoder, 7 ---
--------Rubber belt, 11...Light source, 12
-・-11111 lens array, 13...-mirror, 14...-image sensor. Patent applicant: Fuji Xerox Co., Ltd. Agent: Patent attorney Shin Matsubara 2 Same: Kiyoshi Muraki Reversed
Same as above Jun Shima - Same as above
Hiroshi Sakai Figure 1 Figure 2

Claims (1)

[Scope of Claims] An image reading device that is placed on a document or the like, optically reads the image, converts it into an electrical signal corresponding to each pixel, and stores the converted image information in a nonvolatile memory, An image reading device comprising: a position detecting section that generates a pulse signal of a predetermined period in conjunction with manual sub-scanning; and controlling writing to the nonvolatile memory in synchronization with the pulse signal output from the position detecting section.