JPS62245857A - Picture input device - Google Patents

Abstract

PURPOSE:To detect the sub scanning speed at a low cost by forming a subscanning speed detection mark onto a roller inner circmferential face, and reading the mark by an outside line sensor not used for information reading of a recording medium among the line sensors. CONSTITUTION:A synchronizing means consists of a mark subscanning speed detection formed on the inner circumferential face of the roller 3, a read section 6a at the outside of the CCD line sensor 6 reading the mark 7 and a display lamp 8. The read section 6a is lighted in a line by a lighting means 4 to read optically the mark 7 formed by an image forming lens 5, converts it into an electric signal and outputs the result to a signal processing system. When the subscanning time is shorter than the main scanning time, that is, the CCD one line storage time, a subscanning moving pulse detection means 16 puts on the display lamp 8 to display a fault state as the gast sub scanning speed and fetches a line data stored by the main scanning to a data memory 19 when the subscanning speed is proper.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a method of optically reading information while running and scanning a recording medium such as a manuscript on which information is recorded. The present invention relates to an image input device that can be used as an image input device.

[Conventional technology]

In recent years, manual image input devices have been developed.

For example, as shown in FIG. 9, this image input device includes a line sensor 1 in which an illumination means 102, an optical system 103, a CCD, etc. are used in a casing 101 of a scanner 100.
04, etc., and a roller 10 attached to a casing 101 on a recording medium 105 on which information is recorded.
Sub-scanning is performed by running the scanner 100 while rotating the scanner 6, and main scanning is performed by the licensor 104, thereby making it possible to freely extract information from an area of a constant width and arbitrary length. be.

By the way, since the scanning speed per line by this line sensor 104, that is, the main scanning speed, cannot be increased unlimitedly and is limited to a constant value, if the sub-scanning speed is too fast, information may be skipped. Because of the tremors that occur,
This scanner 100 is usually provided with means (hereinafter referred to as synchronization means) for synchronizing the main scanning speed and the sub-scanning speed.

That is, as this synchronization means, for example, as shown in FIG.
A row encoder having a constant pitch d' is formed on the inner circumferential surface of the roller, the side surface of the roller, etc., and the mark 107 is optically detected by a photo ink printer 108 or the like. This configuration is known, and when the detected sub-scanning speed exceeds the above-mentioned fixed value, it is displayed with a red lamp or the like on the outside of the casing 101.

[Problems to be Solved] Incidentally, in an image input device equipped with a synchronization means having such a configuration, a photo incretor or the like is required for optical detection using a rotary encoder.
Accordingly, the space of the scanner becomes larger and the cost becomes higher.

Therefore, this invention has low manufacturing cost, lightweight,
It is also an object of the present invention to provide a human-powered image device suitable for miniaturization.

[Means for Solving the Problems] That is, in the present invention, a roller attached to a casing of a scanner is rotated above a recording medium, and the scanner travels and scans the recording medium, and the scanner runs and scans the recording medium. In a human-powered image device in which a line sensor optically reads information from a recording medium on a surface, the sub-scanning speed is illuminated by light from an illumination means in order to synchronize the main scanning of the line sensor and the sub-scanning by the scanner. A detection mark is formed on the inner circumferential surface of the rotor, and the mark is read by an external line sensor that is not used for reading information from the recording medium.

[Effect]

The image input device of the present invention illuminates the sub-scanning speed detection mark using light from the illumination means, and illuminates the illuminated mark on the external side of the line sensor that is not used for reading information from the recording medium. By forming an image, it is possible to detect the amount of movement in the sub-scanning direction at each fixed time during scanning, that is, the sub-scanning speed.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an image input device according to the present invention, and this image input device includes the same components as conventional ones, that is, a roller 3 in a casing 2 of a scanner 1.
, an illumination means 4 , an imaging lens 5 , and a CCD line sensor 6 , and the synchronization means includes a mark 7 for detecting the sub-scanning speed formed on the inner peripheral surface of the roller, and this mark 7 . The reading section 6 on the external side of the CCD line sensor 6 reads the
a and one indicator lamp 8.

The rollers 3 are located at the outermost region of the optical path α, and are attached to the casing 2 in pairs on the left and right sides by a support shaft rotatably attached to the casing 2 . and these rollers 3
are each formed into a U-shaped cross section with the inner circumferential surface side cut.

The illumination means 4 is for irradiating the recording medium 9 with slit light through a slit hole (circuit) provided on the bottom side of the casing 2, and is arranged linearly at a predetermined position away from the optical path α. It consists of light emitting diodes, etc.

The imaging lens 5 is for forming an image on the CCD line sensor 6 of image information linearly illuminated onto the recording medium 9 .

The CCD line sensor 6 optically reads image information linearly illuminated by the illumination means 4 and imaged by the imaging lens, converts it into an electric signal, and sends it to a predetermined signal processing system (
It is for output to the circuit) side. As shown in FIG. 3, this signal processing system 10 includes a main scanning synchronizing pulse generating means 11, a CCD 12, an amplifier 13, a comparison voltage (hereinafter referred to as V rsf) generating means 14 of a comparator,
The comparator 15, the sub-scanning movement pulse detection means 16, and the data
data storage line memory 17, analog switch 18,
It is composed of a data memory 19 and a CRT 20.

The main scanning synchronizing pulse generating means 11 has a CCD 12 on the output side.
is connected to the input side of the CCD line sensor 6, and generates main scanning operation pulses at predetermined time intervals, that is, the scanning time interval Δt of one line of the CCD line sensor 6.

As shown in FIG. 4, the CCD 12 has an encoder section that reads a triangular main scanning speed detection mark 7 and a recording medium 9.
The input side is connected to the output side of the main scanning synchronizing pulse generating means 11, and the output side is connected to the input side of the amplifier 13.

As shown in FIG. 3, the amplifier 13 is for amplifying the output signal output from the CCD 12, and its input side is connected to the output side of the CCD 12, and its output side is connected to the input side of the comparator 15. It is connected to the.

The output side of the V rat generating means 14 is connected to the input side of the comparator 15, and in order to perform signal processing of the output signal output from the amplifier 13, the V rat generating means 14 is connected to the input side of the comparator 15. The signal is output to the comparator 15 side.

The comparator 15 includes an encoder detection section 15a and a line data detection section 15b. Then, the encoder detection section 15a compares the output signal outputted from the amplifier 13 and the signals {circle around (2), ..., f} outputted from the Vraf generating means 14, and generates an encoder output signal 1 as shown in FIG.
In order to output 5c, the input side is connected to amplifier 13 and v92.
It is connected to the generating means 14. On the other hand, the line data detection section 15b uses the output signal output from the amplifier 13 and V r
By comparing the V ref signal output from the af generating means 14, a line data output signal 15d as shown in FIG.
In order to output , the input side is connected to the amplifier 13 and the V91 generating means I4 similarly to the encoder detecting section 15a.

The sub-scanning movement pulse detection signal 16 is a display lamp indicating that the sub-scanning speed is too fast (hereinafter referred to as an abnormal state) when the sub-scanning time is shorter than the main scanning time, that is, the C0D1 line accumulation time when performing the sub-scanning operation. 8 is turned on to indicate an abnormal state, and when the sub-scanning speed is appropriate (hereinafter referred to as a normal state), the line data accumulated by the sub-scanning operation is taken into the data memory 19 side. The sub-scanning movement pulse detection means 16 outputs a movement pulse signal to the analog switch 18 for a predetermined period of time in a normal state, and outputs an abnormality signal to the display lamp 8 side for a predetermined period of time in an abnormal state. It is designed to be output. That is, the sub-scanning movement pulse detection means 16 of this embodiment detects the CGD of the encoder section corresponding to the width β of the mark 7, as shown in FIG.
Assuming that the total number of pixels of the I-line sensor 6 is a dot, and the length of the mark 7 is d, encode output when sub-scanning is performed at the maximum scanning speed allowed during the main-scanning time of the C0D1 line. The number of dots corresponds to the number of pixels where the signal changes from H level (white) to L level (black). Then, the sub-scanning movement pulse detection means 16 counts the number n of pixels in which the signal of the encoded output signal changes from the H level to the L level for each main scanning synchronization pulse,
For example, when the main scanning operation is a sub-scanning from X to Y, that is, when the number of pixels k is n hills k<2n, a movement pulse signal is output to the analog switch 18 as a normal state, and the main scanning operation is When the number of pixels k reaches 2n, as in the sub-scanning from A to C, it is assumed that an abnormal state exists, and the output of the movement pulse signal is stopped, and an abnormal signal is output to the display lamp.

The analog switch 18 is connected to the data storage line memory 17.
This is for switching the output of the motor using a moving pulse signal.

The data memory 19 stores l stored in the line memory 17.
It is for capturing and accumulating data for each life, and the input side is connected to the analog switch 18.

The CRT 20 is provided to display information stored in the data memory 19 on a screen.

In this embodiment, the detection mark 7 performs sub-scanning while maintaining the main-scanning time, that is, the time interval Δ[12] for reading and capturing information per line.
As shown in Fig. 7, it consists of a transparent sheet on which black marks are printed at a constant pitch d or a mark sheet with a large difference in contrast, such as black and white, and is pasted on the edge side of the inner circumferential surface of one of the rollers 3. The structure is as follows. Note that this mark may be formed, for example, on both rollers and
It is also possible to configure the CD line sensor to be read by the reading sections on both outer sides, and in this configuration, it is possible to simultaneously detect the occurrence of scanning blur or directional deviation in the sub-scanning direction. You can also do it. Regarding the shape of this mark, for example, see Fig. 8 <a> used in this example.
In addition to the triangular shape shown in Figure 8 (b), for example,
Of course, it is also possible to use a parallel line pattern at regular intervals as shown in FIG. 8(c), a diagonal line pattern as shown in FIG. 8(c), or a combination thereof.

The indicator lamp 8 has the same structure as the conventional one, that is, it is composed of a red light emitting diode lamp, and when the sub-scanning is performed at a speed higher than the main scanning speed, the indicator lamp 8 is turned on to notify the operator that it is in an asynchronous state. The display lamp 8 is turned on.

Therefore, according to the image input device according to this embodiment, the roller 3 that formed the previous mark 7 has a circumferential velocity v expressed by the following equation.
d ■ When performing a sub-operation at a speed of △ or slower than this, the indicator lamp 8 does not light up, and thereby scanning for information reading is performed synchronously. can be confirmed by the display lamp 8.

〔effect〕

As described above, according to the image input device according to the present invention, the synchronization means for synchronizing the main scanning speed and the sub-scanning speed is utilized as part of the conventionally used structural members. Because of this structure, the number of parts can be reduced accordingly, and therefore, it is possible to reduce manufacturing costs as well as reduce the failure rate.
Furthermore, it can be made lightweight and compact, making it extremely practical.

[Brief explanation of drawings]

1 and 2 are respectively a schematic front view and a schematic side view showing a scanner of an image input device according to the present invention, FIG. 3 is a block diagram showing the configuration of a signal processing system according to the present invention, and FIG.
The figure is a waveform diagram showing the output signal output from the COD according to the present invention, FIG. 5 is a waveform diagram showing the output signal output from the comparator according to the present invention, and FIG. 6 is an explanation showing the mark according to the present invention. 7 is an explanatory diagram showing the sub-scanning speed detection mark according to the present invention, FIG. 8(a) to (C) is an explanatory diagram showing the shapes of various marks according to the present invention, and FIG. A schematic front view showing the scanner of the type image input C device, and FIG. γ is an explanatory diagram showing a conventional sub-scanning speed detection mark. 1...Scanner. 2...Casing. 3... Laura. 4...Lighting means. 9...Recording medium. 6...CCD line sensor. 7... Mark for sub-scanning speed detection. Patent Applicant NEC Home Electronics Co., Ltd. Agent Patent Attorney Masu 1) Mei Takeo

Claims (1)

[Scope of Claims] 1. The roller attached to the casing of the scanner is rotated on the recording medium and the recording medium is run and scanned by the scanner, and a plurality of recording media are detected from the recording medium on the running/scanning surface. In an image input device in which a solid-state image sensor including a line sensor formed of a line array of photoelectric conversion elements reads information optically, main scanning of the solid-state image sensor and sub-scanning by a running scanner are synchronized. Therefore, a sub-scanning speed detection mark that is illuminated by light from the illumination means is formed on the inner peripheral surface of the roller, and the mark is placed on the outer side of the solid-state image sensor that is not used for reading information from the recording medium. An image input device characterized in that it is configured to be read by.