JPH0371835B2 - - Google Patents

Description

[Detailed Description of the Invention] Detailed Description of the Invention [Industrial Application Field] This invention optically records information while running and scanning a scanner on a recording medium on which information is recorded, such as a manuscript. This invention relates to an image input device that can read and carry images.

[Conventional technology]

In recent years, manual image input devices have been developed. For example, as shown in FIG. 9, this image input device is equipped with an illumination means 102, an optical system 103, a line sensor 104 using a CCD, etc. in a casing 101 of a scanner 100, and information is recorded. The scanner 100 is run on the recorded recording medium 105 while rotating the roller 106 attached to the casing 101 to perform sub-scanning, and the licensor 104 performs main scanning. In addition, information can be freely extracted from an area of any length.

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 there is a risk of causing
Usually, means (hereinafter referred to as synchronization means) for synchronizing the main scanning speed and the sub-scanning speed is provided.

That is, as this synchronization means, for example, as shown in FIG. 10, a rotary encoder in which grooves or black marks 107 for detecting the sub-scanning speed are formed at regular pitches d' is installed on the inner peripheral surface of the roller. and the mark 107 formed on the side surface of the roller, etc.
A device configured to optically detect the image using a photo interrupter 108 or the like is known.
If the detected sub-scanning speed exceeds the above-mentioned certain value, it is displayed with a red lamp or the like on the outside of the casing 101.

[Problem to be solved]

By the way, in the case of an image input device equipped with a synchronization means having such a configuration, a photo interrupter or the like is required for optical detection using a rotary encoder, which increases the space of the scanner and increases the , costs are increasing.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an image input device that is inexpensive to manufacture, lightweight, and suitable for downsizing.

[Means for solving problems]

That is, the present invention allows the scanner to travel and scan the recording medium while rotating a roller attached to the casing of the scanner, and to detect a line sensor from the recording medium on the traveling/scanning surface. In an image input device that optically reads information, a sub-scanning speed detection mark illuminated by light from an illumination means is installed inside the rotary in order to synchronize the main scanning of the line sensor with the sub-scanning of the scanner. The mark is formed on the circumferential surface, and the mark is read by an external line sensor that is not used for reading information on 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,
The illuminated mark is imaged on the external line sensor that is not used for reading information from the recording medium, and thereby the amount of movement in the sub-scanning direction at each fixed time during scanning, that is, the sub-scanning speed, is determined. It is something that can be detected.

〔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. This image input device includes components similar to conventional ones, that is, a roller 3 and an illumination device, in a casing 2 of a scanner 1. It includes means 4, an imaging lens 5, and a CCD line sensor 6,
In addition, the synchronizing means includes a mark 7 for detecting the sub-scanning speed formed on the inner circumferential surface of the roller, and a reading section 6a on the outside of the CCD line sensor 6 that reads this mark 7.
and an 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 . Each of these rollers 3 is formed into a substantially U-shaped cross section with the inner peripheral surface side cut.

The illumination means 4 is for irradiating the recording medium 9 with slit light through a slit hole (not shown) 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 and the like.

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 converts it into an electric signal to be sent to a predetermined signal processing system (Fig. (omitted) side. As shown in FIG. 3, this signal processing system 10 includes main scanning synchronizing pulse generating means 1.
1, a CCD 12, an amplifier 13, a comparator comparison voltage (hereinafter referred to as V _ref ) generation means 14, a comparator 15, a sub-scanning movement pulse detection means 16, a data storage line memory 17, and an analog switch 1.
8, a data memory 19, and a CRT 20.

The main scanning synchronizing pulse generating means 11 has an output side.
It is connected to the input side of the CCD 12, and is configured to generate main scanning operation pulses at predetermined time intervals, that is, at scanning time intervals Δt for one line of the CCD line sensor 6.

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

The amplifier 13, as shown in FIG.
The input side is connected to the output side of the CCD 12, and the output side is connected to the input side of the comparator 15.

The output side of the V _ref 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 _ref signal is output to the comparator 15 side. There is.

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 output from the amplifier 13 and the V _ref signal output from the V _ref generation means 14 and outputs an encoder output signal 15c as shown in FIG. The input side is connected to an amplifier 13 and to V _ref generating means 14 . On the other hand, the line data detection section 15b uses the output signal outputted from the amplifier 13 and the V _ref generation means 1.
In order to output a line data output signal 15d as shown in FIG. 5 by comparing the V _ref signal outputted from the encoder 4 with the V ref signal outputted from the encoder detection section 15a, the input side is connected to the amplifier 13 and the V _ref generation means 14 in the same manner as the encoder detection section 15a. ing.

The sub-scanning movement pulse detection signal 16 indicates that when performing sub-scanning operation, the sub-scanning time is the main scanning time, that is, CCD1
When the sub-scanning speed is shorter than the line accumulation time (hereinafter referred to as an abnormal state), the display lamp 8 is lit to indicate that the sub-scanning speed is too fast, and when the sub-scanning speed is appropriate (hereinafter referred to as a normal state), the sub-scanning speed is too fast (hereinafter referred to as a normal state). , for taking in the line data accumulated by the sub-scanning operation into the data memory 19 side. This sub-scanning movement pulse detection means 16
is designed to output a movement pulse signal to the analog switch 18 for a predetermined time in a normal state, and output an abnormal signal to the display lamp 8 side for a predetermined time in an abnormal state. That is, the sub-scanning movement pulse detection means 16 of this embodiment assumes that the total number of pixels of the CCD1 line sensor 6 of the encoder section corresponding to the width of the mark 7 is a dot, as shown in FIG. When the length of mark 7 is d, CCD1
The number of pixel elements whose encoder output signal changes from H level (white) to L level (black) when sub-scanning is performed at the maximum scanning speed allowed during the main scanning time of a line is configured into k dots. Then, the sub-scan 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 scan synchronization pulse, and for example, the main scan operation changes from X to Y. Like sub-scanning,
That is, when the number of pixel elements k is n<k2n, it is assumed to be in a normal state and a movement pulse signal is output to the analog switch 18. In some cases, 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 indicator lamp.

Analog switch 18 is for switching the output of data storage line memory 17 using a movement pulse signal.

The data memory 19 captures and stores data for each line stored in the line memory 17, and has an input side 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 has a seventh mark so as to perform sub-scanning while maintaining the main scanning time, that is, the time interval Δt for reading and capturing information per line. As shown in the figure, it consists of a transparent sheet with black marks printed at regular intervals d or a mark sheet with a large contrast difference such as black and white, which is attached to the edge side of the inner peripheral surface of one of the rollers 3. It is becoming. It is also possible to configure this mark to be formed on either of the rollers and read by the reading sections on both outer sides of the CCD line sensor. It is also possible to simultaneously detect the occurrence of scanning blur or directional deviation in the scanning direction. In addition to the triangular shape shown in FIG. 8a used in this embodiment, the shape of the mark may be a pattern of parallel lines at regular intervals as shown in FIG. 8b, for example. Of course, it is also possible to use a diagonal line pattern as shown in FIG. 8c, 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 indicator 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 is in a state where the circumferential speed v is expressed by the following equation, v=d/Δt, or a speed slower than this. When performing sub-scanning, the display lamp 8 does not light up,
Thereby, it can be confirmed by the display lamp 8 that scanning for information reading is being performed synchronously.

〔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 it is structured as follows, the number of partial points can be reduced accordingly.
Therefore, it is possible to reduce the manufacturing cost and the failure rate, and it is also possible to reduce the weight and size, which is 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. This invention depends on
FIG. 5 is a waveform diagram showing the output signal output from the CCD, FIG. 5 is a waveform diagram showing the output signal output from the comparator according to the present invention, FIG. 6 is an explanatory diagram showing the mark according to the present invention, and FIG. 8a to 8c are explanatory diagrams showing the shapes of various marks according to the present invention, and FIG. 9 is a schematic front view showing a scanner of a conventional image input device. 10 are explanatory diagrams showing conventional sub-scanning speed detection marks. 1...Scanner, 2...Casing, 3...Roller,
4... Illumination means, 9... Recording medium, 6... CCD line sensor, 7... Mark for sub-scanning speed detection.

Claims (1)

[Scope of Claims] 1. A roller attached to a casing of a scanner is rotated above the recording medium, and the scanner runs/scans the recording medium, and the recording medium on the running/scanning surface is removed from the recording medium. In an image input device in which a solid-state image sensor including a line sensor formed by a line array of a plurality of photoelectric conversion elements reads information optically, the main scanning of the solid-state image sensor and the sub-scanning by running a scanner are synchronized. In order to achieve this, 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 outside of the solid-state image sensor that is not used for reading information from the recording medium. An image input device characterized in that the image input device is configured to be read by a device on the side.