JPH0238982B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] A sensor mounting mechanism in which an engagement protrusion on one surface of the outer circumference of a sensor holder holding an optical sensor is engaged with a groove of a set plate, and an engagement projection on the other surface is engaged with a groove on the set plate. The attachment of the optical sensor can be facilitated by pressing the mating projection with the pressure plate.

[Industrial application field]

The present invention provides point-of-sale management.
The present invention relates to an optical sensor mounting mechanism for a scanner that reads barcodes used in sales (hereinafter referred to as POS), etc., and particularly to a sensor mounting mechanism that can facilitate the installation work of optical sensors.

Recently, POS systems have been widely adopted in department stores, supermarkets, etc., and use reading devices (hereinafter referred to as scanners) that optically read product numbers and prices from labels, etc. There is a desire for a configuration in which the optical sensor incorporated in the optical unit of this scanner can be easily attached.

[Conventional technology]

A scanner used in a POS system will be described below with reference to FIGS. 3 to 5 as an example. FIG. 3 is an internal side view showing an outline of the scanner, FIG. 4 is a plan view showing the main parts of FIG. 3, and FIG. 5 is a side sectional view illustrating the conventional method. The same reference numerals indicate the same objects throughout the figures.

As shown in FIG. 3, the scanner 1 includes an optical unit 2 and a recognition section 3 inside, and the optical unit 2 includes a laser tube (not shown), a hologram disk 21 directly connected to a motor Mi, and mirrors 4a to 4.
d, lens 22, sensor (light receiving element of optical sensor)
23, etc., and a rotating hologram disk 21 is irradiated from a laser tube via a mirror 4a, and a laser beam is sent from a reading window 5 via mirrors 4b and 4c to scan a bar code on an object outside the device. It has a function of reading the reflected light indicated by the broken line in the figure.

That is, as shown in FIG.
The light is reflected in the right angle direction at point d, focused by the lens 22, and detected by the sensor 23. The detection signal is converted into an electrical signal and sent to the recognition section 3 shown in FIG. Further, the recognition unit 3 has a function of decoding input electrical signals and recognizing them as data.

Here, the mounting mechanism of the sensor 23 will be described in detail. As shown in FIG. 5, a sensor guide 25 having a guide hole 25a is positioned and fixed to the frame 24 of the optical unit 2 with a screw 26.

The sensor 23 is attached to a printed board 27, and a conversion circuit 28 for converting the detection signal of the sensor 23 into an electrical signal is mounted on the printed board 27.
Furthermore, a shield case 29 is attached to surround the sensor 23 and the conversion circuit 28 to prevent noise.

The sensor 23 is inserted into the guide hole 25 of the sensor guide 25.
a and is guided by the shield case 29, and is screwed to the frame 24 at a mounting portion provided at a position perpendicular to the figure of the shield case 29.

[Problem that the invention seeks to solve]

In the above conventional mechanism, the sensor 23 fixed to the printed board 27 is attached to the sensor guide 25.
The sensor 23 is fixed with a screw in alignment with the guide hole 25a of the sensor 23, and due to the play in the fit between the guide hole 25a and the sensor 23 and the state of the screw tightening, not only the mounting position accuracy cannot be obtained, but also the installation work is troublesome. There is a point.

[Means for solving the problem] In FIGS. 1 and 2, the sensor holder 30
holds the sensor 23 at one end of the guide hole 30a,
Engagement protrusions 30b are formed on at least two opposing surfaces of the outer peripheral portion of the other end.

The set plate 31 has a holding portion 31b that holds the sensor holder 30 inserted through the opening 31c, and a groove 31d into which the engagement protrusion 30b on the front surface of the held sensor holder 30 engages.

The pressure plate 32 is the set plate 31
It has a function of urging the engagement protrusion 30b on the rear surface of the sensor holder 30 held by the holding part 31b.

Therefore, the sensor holder 30 is attached to the set plate 3.
1 and insert it into the holding part 31b of the front engaging protrusion 3.
0b is engaged with the groove 31d, and the pressure plate 32 is configured to press the engagement protrusion 30b on the rear surface of the sensor holder 30.

[Effect]

According to the present invention, the sensor holder 30 is inserted through the opening 31c of the set plate 31, the front engagement protrusion 30b is engaged with the groove, and the rear engagement protrusion 30b is pressed by the pressure plate 32. By doing this, the positioning of the optical sensor 23 can be made accurate.
And it can be done easily.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a front view showing the main parts of FIG. 1. The same reference numerals indicate the same objects throughout the figures.

As shown in FIGS. 1 and 2, the sensor holder 30 has a guide hole 30a through which reflected light passes and holds the sensor 23, an engaging protrusion 30b at one end of the outer periphery, and a flange 30c at the other end. It is formed.

The printed board 27a has a hole 27b that is larger in diameter than the guide hole 30a and smaller in diameter than the flange 30c.
is provided, and the printed board 27a is connected to the flange 30c.
A sensor holder 30 is slidably attached to the surface of the printed board 27a within the distance between the hole 27b and the connecting pin 30d, sandwiching it between the sensor holder 30 and the plate 31 connected thereto by a connecting pin 30d.

Therefore, the sensor 23 and the conversion circuit 28 are connected by a flexible conductive wire (not shown).

The sensor plate 31 has holes 3 through which reflected light passes.
1a, and a holding portion 31b are formed. The holding portion 31b is provided with an opening 31c into which the sensor holder 30 is inserted and a groove 31d into which the engagement protrusion 30b of the inserted sensor holder 30 engages. Also, the sensor plate 31 is attached to the frame 24.
The accuracy is fixed to suit the mounting of the sensor 23.

The pressure plate 32 has one end connected to the frame 2.
4, and the other end is biased in the direction of the opening 31c by a spring 33, and presses the rear engaging protrusion 30b of the inserted sensor holder 30 in the direction of arrow A. It is configured as follows.

With such a configuration, the pressure plate 32 can be moved in the direction indicated by the arrow B against the elasticity of the spring 33.
the opening 3 of the sensor plate 31.
When the sensor holder 30 is inserted from 1c, the front engagement protrusion 30b engages with the groove 31d and the holding part 3
1b.

Then, when the pressure plate 32 is released, the tip of the pressure plate 32 presses the rear engagement protrusion 30b of the sensor holder 30, and the sensor holder 30 is moved to the holding part 3 of the sensor plate 31.
1b. At this time, the printed board 27a
Since the sensor holder 30 and the sensor holder 30 are slidable, the printed board 27a can be fixed regardless of the mounting accuracy of the sensor 23.

In this way, the sensor 23 can be easily attached with high precision.

〔Effect of the invention〕

As explained above, according to the present invention, there is an effect that the sensor can be attached with high precision and with a simple operation.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a front view showing the main parts of Fig. 1, Fig. 3 is an internal side view showing an overview of the scanner, and Fig. 4 is the same as Fig. FIG. 5 is a plan view showing the main parts, and a side sectional view illustrating the conventional method. In the figure, 1 is a scanner, 2 is an optical unit, 23 is a sensor, 24 is a frame, 25 is a sensor guide, 25a, 30a are guide holes, 27, 2
7a is a printed board, 27b and 31a are holes, 28 is a conversion circuit, 29 is a shield case, 30 is a sensor holder, 30b is an engaging protrusion, 30c is a flange, 31 is a sensor plate, 31b is a holding part, 3
1c is an opening, 31d is a groove, 32 is a pressure plate, and 33 is a spring.

Claims (1)

[Scope of Claims] 1. A sensor holder 30 that holds the sensor 23 at one end of the guide hole 30a and has engagement protrusions 31b formed on at least two opposing surfaces of the outer periphery of the other end is inserted through the opening 31c. Sensor holder 30
a set plate 31 having a groove 31d in which the engagement protrusion 30b on the front surface of the held sensor holder 30 engages; and the engagement protrusion 30b on the rear surface of the held sensor holder 30. The sensor holder 30 is inserted into the holding part 31b of the set plate 31, and the engagement protrusion 30b on the front surface is engaged with the groove 31d. 30. A sensor mounting mechanism characterized by having a configuration for pressing an engagement protrusion 30b on the rear surface of the sensor mounting mechanism 30.