JPH06348876A - Bar code detector - Google Patents

Abstract

(57) [Summary] [Purpose] When detecting barcodes with different reading widths (maximum widths), the purpose is to enable proper reading with one or a few barcode detectors. [Structure] A plurality of lens fixtures 6a, 6b are provided in a case 7 of a barcode detector, and the condenser lens 4 can be fixed by selecting the lens fixtures 6a, 6b according to the reading width of the barcode 1. Make it possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar code detector used in production control, sales control and the like.

[0002]

2. Description of the Related Art Conventional bar code detectors, when reading bar codes having different reading widths (maximum widths) at optimum positions, use dedicated ones according to the size of the bar code.

FIG. 2 shows an example of a conventional bar code detector. In the figure, 1 is a bar code, and 7 is a case of a bar code detector. In the case 7, an LED light source 2 arranged near the tip, a reflecting mirror 3 for refracting the light reflected by the LED light source 2 upon hitting the barcode 1, and a light from the reflected light 3 are condensed. A condenser lens 4, a CCD sensor 5 for receiving the condensed light, and a processing circuit 8 are provided, and a communication cable is connected to the processing circuit 8.

In the above structure, the LED light emitted from the LED light source 2 is reflected by the surface of the bar code 1 and is reflected by the reflecting mirror 3.
Thus, the optical path is changed, and an image is formed on the CCD sensor 5 by the condenser lens 4. The formed optical signal is converted into an electric signal by the CCD sensor 5 and sent to the processing circuit 8. The processed data is exchanged with an external terminal or the like via the communication cable 9.

[0005]

In such a conventional bar code detector, when the bar code 1 having a different reading width (maximum width) is read at an optimum position,
Due to the characteristics of the condenser lens 4, it is necessary to always move the relative position between the condenser lens 4 and the CCD sensor according to the reading width (maximum width). Therefore, when detecting the barcodes 1 having different reading widths (maximum widths), dedicated barcode detectors having different fixing positions of the condenser lens 4 are used. Alternatively, a bar code detector having a large readable width is used to detect the bar code. However, the former method requires many bar code detectors, is expensive, and is difficult to manage. Further, in the latter method, when a barcode having a small reading width (maximum width) is detected, there is a problem that the reading performance is deteriorated because it is not the optimum position.

The present invention is intended to solve the above problems, and it is an object of the present invention to reduce the types of bar code detectors so as to be inexpensive and easy to manage without degrading the reading performance.

[0007]

In order to achieve the above object, the present invention provides two or more lens fixing portions in a case of a bar code detector, and selects the lens fixing portion to fix the lens. The configuration.

[0008]

According to the present invention, in the above structure, when a bar code having a different reading width (maximum width) is detected, the lens is fixed by selecting the lens fixing portion so that the lens can be read at an optimum position. Become.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same components as those in the conventional example are designated by the same reference numerals. In the figure, 1 is a bar code, 2 is an LED light source, 3 is a reflector, 4 is a condenser lens, 5 is a CCD sensor, 7 is a case,
Reference numeral 8 is a processing circuit, and 9 is a communication cable, which have the same configurations as those of the conventional one, and the description thereof will be omitted.

The characteristic feature of this embodiment is that a plurality of lens fixtures 6a and 6b are provided in the case 7.
In the above configuration, the LED light emitted from the LED light source 2 is reflected by the surface of the barcode 1, the optical path is changed by the reflecting mirror 3, and the condenser lens 4 at the position fixed by the lens fixing tool 6a or 6b causes the CCD sensor. 5 is imaged. The formed optical signal is converted into an electric signal by the CCD sensor 5 and sent to the processing circuit 8. The processed data is exchanged with an external terminal or the like via the communication cable 9.

When the condenser lens 4 is fixed at the position of the lens fixture 6a, a certain reading width (maximum width)
When the barcode 1 can be read at the optimum position and a barcode having a larger reading width (maximum width) than the barcode 1 is detected, it is closer to the CCD sensor 5 side than the fixed position of the lens fixture 6a. Optimum reading is possible by fixing the condenser lens 4 to the position of the lens fixing tool 6b. However, the positions of the lens fixtures 6a and 6b are relative, and the absolute position changes depending on the characteristics of the condenser lens 4.

In the embodiment, the number of lens fixtures is two.
However, the number may be more than that, and the fixing structure of the lens is not limited to that shown in the figure.

[0013]

As is clear from the description of the above embodiment,
According to the present invention, since the fixed position of the lens can be changed, it is possible to optimally read barcodes having different reading widths (maximum widths) using one barcode detector, and many barcodes can be read. It is not necessary to have a detector. As a result, it is easy to manage the equipment, does not require high cost, and has a great effect.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a bar code detector according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a conventional bar code detector.

[Explanation of symbols]

 1 Bar Code 2 LED Light Source 3 Reflector 4 Condenser Lens 5 CCD Sensor 6a Lens Fixing Tool 6b Lens Fixing Tool 7 Case 8 Processing Circuit 9 Communication Cable

Claims (1)

[Claims] 1. A light source for irradiating a bar code surface with light, a reflecting mirror for changing a reflection optical path of the irradiation light reflected on the bar code surface, a condenser lens for condensing the reflected light, and the collector. A bar code detection in which a sensor such as a CCD that receives light and converts it into an electric signal is provided in the case, a plurality of lens fixing parts are provided in the case, and the lens fixing parts can be selected to fix a condenser lens. vessel.