JP3124309B2 - Scanner device and reading method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanner having a sensor section in which sensors are arranged in a row in a direction perpendicular to a moving direction of a carriage , and a reading method using the same. .

[0002]

2. Description of the Related Art Conventionally, a scanner device detects a deviation between an effective signal range and the origin of a document reading region by reading a test document placed in a document reading region, and detects the deviation so that the deviation amount becomes zero. The operator adjusted the mounting position of the part.

[0003]

However, in the conventional scanner device, the scanner device is disassembled and the signal is directly checked with a synchroscope in order to detect the deviation amount. However, there is a problem that it is not possible to correct the displacement of the sensor unit after shipment due to vibration or the like.

Accordingly, an object of the present invention is to provide a scanner device which does not require adjustment of the mounting position of the sensor unit.

[0005]

In order to solve the above-mentioned problems, according to the present invention, after receiving an HD signal, the sensors are sequentially arranged from the leftmost sensor.
A sensor unit that outputs a voltage level corresponding to the amount of light, an A / D conversion unit that converts the input voltage level into a digital value while the valid signal is valid, and stores the input digital value for one line; A readable / writable memory unit, a valid signal that changes according to a set value, a signal generation circuit that outputs an HD signal, a fluorescent lamp, and ON / OFF of the fluorescent lamp
It has a configuration that has a CPU that controls the signal generation circuit and the memory unit when it is OFF, so that adjustment of the mounting position of the sensor unit becomes unnecessary.

[0006]

In the scanner configured as described above, the CPU sets the pixel shift value and the effective pixel value in the signal generation circuit and turns on the fluorescent lamp. The signal generation circuit is 1
An HD signal indicating a line reading cycle is generated, and an effective pixel signal is generated according to the value set by the CPU unit. After receiving the HD signal, the sensor unit outputs a pixel voltage.

When the A / D converter receives the pixel voltage,
It converts to a digital value and outputs pixel data only while the valid signal is output. The memory unit receives and stores the pixel data. The CPU reads out the pixel data stored in the memory, calculates an accurate pixel shift value, and sets the pixel shift value in the signal generation circuit.

[0008]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The embodiment is as shown in the apparatus block diagram of FIG.
A sensor unit 1 for generating a pixel voltage 9 from a light amount, an A / D converter 2 for receiving the pixel voltage 9 and outputting pixel data 10, a memory unit 3 for storing one line of pixel data 10, The valid signal 5 is generated based on the HD signal 4, the pixel shift value 11 and the valid pixel value 12 repeatedly output to
A signal generating circuit 6 serving as a signal generating means for generating a fluorescent light 7
CPU unit that detects the end face of the housing from one-line data stored in the memory unit 3, controls ON / OFF of the fluorescent lamp 7, and sets the pixel shift value 11 and the effective pixel value 12 in the signal generation circuit 6. Consists of eight.

Next, the operation will be described. Before the scanner reads an original, the CPU 8 turns on the fluorescent lamp 7 and sets the pixel shift value = “0” and the effective pixel value = “3472” in the signal generation circuit 6. The signal generation circuit 6 synchronizes with the HD signal 4 and outputs a valid signal 5. This is shown in the timing chart of FIG. The sensor unit 1 outputs a pixel voltage 9 corresponding to the amount of light. The A / D converter 2 outputs a valid signal 5
The pixel voltage 9 is converted into an 8-bit digital value and output as pixel data 10 only during the section where is valid.

The memory unit 3 stores the pixel data 10 for one line. The CPU unit 8 reads one line of pixel data 10 from the memory unit 3, detects the number of pixels up to the end face of the housing, and adds the number of pixels up to the origin of the document reading area to a pixel shift value to generate a signal. Set in circuit 6. The effective signal waveform in this case is shown in FIG. After the end of this operation, the scanner enters a reading operation.
The CPU may be used as a signal generating means for generating an effective signal from the HD signal, the pixel shift value, and the number of effective pixels, or the effective pixels may be cut out only by the program control of the CPU.

[0011]

As described above, this operation is executed each time the scanner reads an original, so that the following effects are obtained. 1) Adjustment of the mounting position is not required when the mounting position of the sensor unit shifts due to vibration. 2) It does not require much mechanical precision of the mounting position of the sensor unit, and the mechanical design is easy. 3) There is no need to adjust the sensor mounting position at the time of shipment.

[Brief description of the drawings]

FIG. 1 is a block diagram of a scanner device according to the present invention.

FIG. 2 is a timing chart of the scanner device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sensor part 2 A / D conversion part 3 Memory part 4 HD signal 5 Effective signal 6 Signal generation circuit 7 Fluorescent lamp 8 CPU part 9 Pixel voltage 10 Pixel data 11 Pixel shift value 12 Effective pixel value

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 1/04-1/207

Claims (2)

(57) [Claims] 1. A sensor unit for converting a change in light amount into a pixel voltage according to an HD signal and outputting the pixel voltage, and an A unit for A / D converting the pixel voltage and outputting pixel data.
/ D conversion unit, and detects the number of pixels at a change point of pixel data from the pixel data
CPU section that outputs the number of pixels up to the document reading position
Indicates the effective range immediately after the HD signal before scanning the original.
A valid signal is output to the A / D converter and the original is read.
Sometimes, based on the number of pixels input from the CPU unit,
A signal for outputting the corrected effective signal to the A / D converter
Scanner apparatus characterized by comprising: a generating means. 2. A sensor unit for converting a change in the amount of light into a pixel voltage in accordance with an HD signal and outputting the pixel voltage, and an A / D converter for A / D converting the pixel voltage in accordance with an effective signal and outputting pixel data. A reading method using a scanner device comprising:
Thus, the sensor unit converts the change in light amount into a pixel voltage and outputs the pixel voltage.
Step and the A / D conversion unit synchronizes the image with the first valid signal.
A / D conversion of an elementary voltage to output pixel data
And detecting the number of pixels at the change point of the pixel data from the pixel data
And calculating the number of pixels up to the document reading position
And before the reading of the original, the sensor unit converts the light quantity change into a pixel voltage again and outputs
And a pixel shift according to the number of pixels up to the original reading position.
And a second validity signal formed based on the first validity signal
Outputting a valid signal; and outputting the valid signal by the sensor unit in synchronization with the second valid signal.
A / D conversion of pixel voltage to output pixel data
And a scanner for reading a document.
Reading method using a canner device .