JPS62132470A - System for correcting carrier error value storage of optical reader - Google Patents

Abstract

PURPOSE:To make correction on the carrier error of an optical reader, by providing a mechanism which calculates the correcting value of the carrier error from the optically read results of marks provided on a medium at standard distances and a storage section which stores the correcting value. CONSTITUTION:By depressing a correcting value storage switch 107, a medium 200 for storing correcting value is carried in the direction of the arrow 105 and optically read. Marks 201 and 202 are printed on the medium 200 with a fixed distance between them and an optical reading section 106 carries out reading operations along a reading center line 203. The read results of the section 106 are processed at a control processing section 101. The processing section 101 calculates the optically read number of times until detecting the mark 202 by using the mark 201 in the leading edge section of the medium as a reference position for reading and calculates the carrier error correcting value of this carrier system from the difference between the calculated number of times and a previously calculated standard optically read number of times containing no carrier error. The correcting value thus calculated is stored in a nonvolatile storage section 108 and a carrier error is corrected. Therefore, the accuracy of the optically reading position of this carrier system can be improved without improving its mechanical accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a conveyance mechanism, and particularly relates to a conveyance error correction of an optical reading device, which is suitable for correcting a conveyance error of an optical reader that reads a medium while conveying it. .

[Background of the invention]

The conventional device requires a detection sensor as described in Japanese Patent Laid-Open No. 59-87063. But -1f
No consideration was given to the fact that it would be expensive due to the presence of a sensor.

[Purpose of the invention]

An object of the present invention is to optically read marks on the medium separated by a predetermined distance in an optical reading device that reads a medium while transporting it, and to calculate a correction value for transport error from the result. It is an object of the present invention to provide a correction method that stores this correction value in an optical reading device and corrects a conveyance error of the optical reading device using this correction value.

[Summary of the invention]

In an optical reading device that optically reads a pattern on a medium while transporting the medium at a constant speed, in order to improve the reading position accuracy, it is necessary to improve the accuracy of the transport mechanism and the speed accuracy. However, part dimensional changes due to environmental temperature1
Mechanical Machining Accuracy 1 Considering assembly accuracy, aging, etc., it is difficult to improve the accuracy of the conveyance mechanism, and the price of the device also increases. The present invention provides marks on the medium at standard distances, calculates a correction value for conveyance error based on the optical reading result, stores this correction value in an optical reading device, and stores the correction value in the optical reading device. By correcting the transport error of the optical reading device, without improving the mechanical accuracy.

This makes it possible to improve optical reading position accuracy.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Fig. 1 shows an overview of the optical reading device.
01 drives and rotates the motor 102 at a constant speed to rotate the conveyance roller 103, whereby the medium 104 is conveyed at a constant speed in the direction of an arrow 105. The optical reading section 106 is.

The figure on the medium, indicated by arrow 107, continues to be read at constant time intervals sufficient to read the figure on the medium.

In order to store the conveyance error correction value, press the correction value storage switch 107 to notify the control processing unit 101 that it is in the correction value storage mode.

Thereafter, move the correction value storage medium 200 shown in FIG.
05 direction and read optically. On the correction value storage medium 200, marks 201,
202 is printed, the optical reading unit 106 continues reading along the reading center line 203, and the reading result is sent to the control processing unit 101 for processing. When the control processing unit 101 detects the mark 201 printed at the top of the medium, it uses this as the reading reference position and calculates the number of optical readings until the mark 202 is detected, which is calculated in advance. A conveyance error correction value for this conveyance system is calculated based on the difference from the number of optical readings of the symbol that does not include conveyance errors, and is stored in the non-volatile storage unit 108.
to be memorized. Once the correction value is stored, the correction value storage switch 107 is pulled up to notify the control unit 101 that it is the normal reading mode. Thereafter, the normal reading medium 210 shown in FIG. 2 is conveyed in the direction of arrow 105 and optically read. A leading mark 211 is preprinted on the normal medium,
After that, there are marks 212 written at random, but the optical reading section 106 continues reading along the reading center line 213, and the reading result is sent to the control processing section 101. The control processing unit 101 is.

Random marks 212 after the media head mark 211 are detected, and the transport error is corrected according to the transport error correction value stored in the non-volatile storage unit 108, so that the accurate position from the mark 211 can be determined. Note that FIG. 3 shows a schematic flow diagram of this process.

According to this embodiment, there is an effect that reading processing can be performed efficiently using correction values stored in advance.

In this embodiment, the correction value is calculated by reading the mark on the medium, but it is also possible to optically detect the edge of the medium and perform correction based on the length of the medium.

〔Effect of the invention〕

According to the present invention, it is possible to obtain reading position accuracy even when mechanical transport accuracy is not high, and it is possible to provide an optical reading device that transports a medium that requires position accuracy at a low cost. .

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an apparatus according to an embodiment of the present invention, 101...
- Control processing unit, 200...Correction value storage medium, 102
...Motor, 201, 202...Mark, 103...
- Conveyance roller, 210... Normal reading medium, 104...
・Medium, 211...Medium head mark, 106...Optical reading section, 212...Random entry mark, 107...
- Correction value storage switch, 108... non-volatile storage section. Fig. 2 Fig. 3 (Kado No. 3 Shiritsu 1 1 Sutra (ES set missing 4 + 1 person mark - or 7 ES *L place IS ni. 1 Mi ear kuu X'? ] (b) 〉 ! ] 〉 ] □ 〉

Claims (1)

[Claims] 1. In an optical reading device consisting of a transport section, an optical reading section, and a control processing section, a mechanism for calculating a correction value for a transport error from the result of optical reading of a mark on a medium having a standard distance, and a storage section for storing this correction value. A conveyance error value storage correction method for an optical reading device, characterized in that it is provided with: