JP2578909Y2 - Light source position adjustment mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source position adjusting mechanism capable of adjusting a light emitting position after a light source is mounted in a housing of a bar code reader.

[0002]

2. Description of the Related Art In a housing of a stationary bar code reader, for example, a semiconductor laser (LD) or the like is installed as a light source for emitting reading light toward a bar code label. Since a semiconductor laser or the like used as the light source has higher directivity than a light emitting diode (LED) or the like, it is necessary to correctly adjust the position and the direction at the time of mounting. Therefore, conventionally, for example, as shown in FIG. 3, two types of mirrors 10 for finely adjusting the emission direction of the laser beam for each direction component are provided.
0, 101, and using these, a semiconductor laser 102
The initial setting of is done.

[0003]

However, when the adjustment is performed using such a mechanism, the mounting area becomes large, and the housing tends to be inevitably increased in size. Moreover, in such a mechanism, since the laser beam light is attenuated by the reflection on the mirror, there is a possibility that the reading power is reduced. In view of the above-mentioned conventional disadvantages, the present invention has an object to provide a light source position adjusting mechanism which is suitable for miniaturization and has little attenuation of light intensity (light quantity).

[0004]

That is, the present invention provides a light emitting optical system of a bar code reader for projecting and scanning illumination light emitted from a light source in a bar width direction of a bar code label.
The light source position adjusting mechanism for adjusting the emitted light projection position after attaching the light source to the bar code reader body, bar
Ball holder against the holder provided in the code reader housing
The face is rotatably fitted and the front and rear of this spherical
Portion has a protruding portion, which penetrates the inside of the spherical body, and protrudes forward and backward.
Provide a through hole to the protrusion, and insert a light source into the through hole of the rear protrusion
Are provided with convergent lenses in the through holes of the front protruding portions, respectively .

[0005]

In the present invention, instead of using two types of mirrors, a spherical body that directly rotates the light source side up, down, left and right is used as a holder.
And the projections provided before and after this spherical body
The light source and the converging lens are integrated inside the unit , so that the initial setting of the light source can be performed without using a mirror.
In addition, the light source and the converging lens are one unit and simple.
Can be summarized . Further, according to the present invention, it is possible to prevent the spectral intensity from being attenuated without being reflected by the mirror.

[0006]

An embodiment of the present invention will be described below with reference to the accompanying drawings. Figure 1 shows a light source position adjusting mechanism according to the invention, the light source position adjusting mechanism accommodates the light source 1 and the converging lens 5 as one unit
The casing 2 provided with the spherical body 21 and the spherical body 21 are rotated.
And a holder 31 provided on the housing 3 of the bar code reader provided with a holder 31 for supporting the bar code reader. Note that reference numeral 4 in the drawing denotes a polygon mirror. Casing 2, the central portion is cylindrical protrusions 22 on both sides of the facing is formed with a spherical body 21 of spherical internal as shown in Figure 2 through which bored into a substantially cylindrical shape hole 23 forms a, a semiconductor laser (LD) 1 as a light source and a converging lens 5 is attached to both <br/> end of the through hole 23. The spherical body 21 is fitted in the concave hole 31A of the holder 31 as shown in FIG. 2 , and when the spherical body 21 is pushed around by a certain force, that is, a force larger than a frictional force for holding the spherical body 21 in an immobile state. , The hole 31A
It turns up, down, left and right along the inner surface of the. The outer peripheral surface 21A of the spherical body 21 is formed of a material having a relatively large coefficient of friction so that the spherical body 21 does not rotate unless pushed by a hand or the like.

[0007]

As described above, according to the light source position adjusting mechanism of the present invention, instead of using two kinds of mirrors, a spherical body for directly rotating the light source and the converging lens up, down, left and right is used. Since the holder is rotatably provided, it is possible to initialize the light source itself without using a mirror, and it is possible to reduce the size of the bar code reader by eliminating the need for the mirror and the optical path area before and after the mirror. (Light intensity)
Can be prevented from attenuating. Furthermore, the light source position according to the present invention
According to the adjustment mechanism, a through hole is provided inside the
Since the light source and the converging lens are installed inside the projection,
The source and the converging lens can be combined into one unit,
Adjust the distance and position between the light source and the light source in advance.
If it is mounted, there is no need to adjust the lens position afterwards.
After that, adjusting the projection direction is as simple as rotating the spherical body.
It is and this easily performed in a very simple operation.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a bar code reader provided with a light source position adjusting mechanism according to the present invention.

FIG. 2 is a sectional view of the light source position adjusting mechanism shown in FIG.

FIG. 3 is an explanatory view showing a conventional light source position adjusting mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Light source (semiconductor laser) 2 Casing 21 Spherical body 22 Projecting part 23 Through-hole 3 Housing (of barcode reader) 31 Holder 5 Convergent lens

Claims (1)

(57) [Scope of request for utility model registration] In a light projection optical system of a bar code reader for projecting and scanning illumination light emitted from a light source (1) in a bar width direction of a bar code label, the light source (1) is mounted in a bar code reader main body. A light source position adjusting mechanism for adjusting the light emitting position of the light source , the holder being provided in a housing (3) of the bar code reader.
The spherical body (21) is rotatably fitted to (31).
In addition, a protrusion (22) is provided at the front and rear portions of the spherical body (21), and the front and rear protrusions (2) penetrate through the inside of the spherical body (21).
A through hole (23) leading to 2) is provided, and the light source (1) is inserted into the through hole (23) of the rear protruding portion (22).
Convergent lens in through hole (23) of front projection (22)
(5) A light source position adjusting mechanism provided with each of the above .