JPH0543264U - Barcode reader - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the ambient brightness changes depending on the place of use, time, etc., the intensity of light emitted from the light source is changed depending on the brightness to ensure reliable reading. . [Structure] The changing means 3 is appropriately moved according to the place of use and the state of the bar code label, and when reading in a dim room, for example, the output of the light source 2 is increased to raise the light intensity to an appropriate value.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a barcode reader capable of optically reading a barcode described on a barcode label.

[0002]

[Prior Art]

 In a normal bar code reader, as shown in FIG. 3, for example, a light source 101 such as a light emitting diode (LED) and a reflected light emitted from the light source 101 and reflected by a bar code label 102 proceed inside a main body casing 100. The image forming lens 103 provided on the optical path, and the light receiving unit 104 such as a photo sensor for receiving and receiving the reflected light after passing through the image forming lens 103 are provided.

[0003]

[Problems to be solved by the device]

 By the way, in such a bar code reader, the intensity of the light emitted from the light source for reading the bar code is usually set to an appropriate constant value and cannot be changed. When the bar code label is thin or the ground part of the bar code label is dirty, the difference in reflectance between the black and white parts becomes small, which may cause problems such as inaccurate reading. Further, in the case of the bar code reader having such a configuration, if it is used in a place where it is dim or extremely bright due to the relation of lighting, there is a possibility that a reading error or unreadable will occur. In addition, the ambient brightness may fluctuate significantly when used in a place where the distance from the light source to the bar code fluctuates greatly, and the same problem occurs in such cases. Therefore, in consideration of the above-mentioned conventional problems, the present invention changes the light intensity emitted from the light source at any time according to the brightness even if the ambient brightness changes depending on the place of use or time. It is an object of the present invention to provide a bar code reader capable of reliable and reliable reading.

[0004]

[Means for Solving the Problems]

 That is, the present invention is a bar code reader that projects light emitted from a light source onto a bar code label, and causes light reflected by the bar code label to enter a light receiving section to read the bar code described on the bar code label. It is provided with a changing means for changing the light intensity of the emitted light emitted from the light source.

[0005]

[Action]

 The bar code reader of the present invention operates the changing means appropriately according to the place of use and the state of the bar code label, for example, when using the bar code label in a dim room or when reading a bar code label with stains or fading. It is possible to increase the output of the light source to emit light with the light intensity increased to an appropriate value.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a bar code reader according to the present invention. This bar code reader is provided with a changing means 3 between a power source 1 and a light source 2, and a light intensity is set by an operation switch 4. You can make changes. In this embodiment, an AC power source outside the main body casing 5 is used as the power source 1 via a cord. It should be noted that this power source may be configured such that a predetermined battery is provided inside the main body casing. Although the light source 2 uses a light emitting diode (LED) that emits light of a predetermined wavelength in this embodiment, it may be a semiconductor laser (LD) or the like.

The changing means 3 allows the user to judge the brightness of the room during use, the black-and-white state of the barcode label to be read, etc., from the light source 2 at the time of use in rainy weather or at night, for example. The light intensity of the emitted light is increased, and the electric power supplied from the power supply 1 is changed / increased. The changing means 3 of this embodiment is operated by an operation switch 4, and the operation switch 4 is located at a position where an operator can easily operate it with a finger or the like when holding the casing 5 by hand. It is set up. As the operation switch 4 of this embodiment, as shown in FIG. 2, a slide switch is used so that the light intensity can be changed and adjusted steplessly.

[0008]

[Effect of the device]

 As described above, according to the barcode reader of the present invention, the light / dark state of the place of use, the black and white density state of the barcode label, or the optical distance between the barcode label and the light source, etc. The intensity of the light emitted from the light source can be changed and adjusted at any time according to the magnitude of fluctuations in the light source, and it is possible to read in an optimal state, ensuring reliable and accurate reading. It is possible to provide a highly reliable device capable of reading.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing a bar code reader according to the present invention.

FIG. 2 is a side view showing a main body casing to which operation switches of the barcode reader according to the present invention are attached.

FIG. 3 is a schematic configuration diagram showing a conventional barcode reader.

[Explanation of symbols]

 2 light source 3 changing means

Claims (1)

[Scope of utility model registration request] 1. A bar code reader for projecting light emitted from a light source onto a bar code label, and causing light reflected by the bar code label to enter a light receiving portion to read the bar code described on the bar code label. A bar code reader comprising a changing means for changing the light intensity of emitted light emitted from a light source.