JP2576910Y2 - Barcode reader sensor holding structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor holding structure incorporated in a bar code reader.

[0002]

2. Description of the Related Art As a conventional sensor holding structure of a bar code reader, the structure shown in FIG. 3 is generally known. The bar code reader 1 has a case body 11 on which a sensor 2 and a printed circuit board 3 for processing an electric signal from the sensor 2 are arranged. Sensor 2 is an elongated case 2 divided into two
An LED serving as a light emitting element, a phototransistor serving as a light receiving element, and the like are arranged in 1. A terminal 22 of the light emitting element is extended from a rear end face of the case 21 and a terminal 23 of the light receiving element is connected from both rear end side faces. Projecting. On the other hand, the case body 11 has a cylindrical shape, and the both side edges of the printed board 3 are fitted into the inner wall surface thereof by light press-fitting.
1a are provided facing each other.

A male screw 11b is formed on the outer peripheral surface of the tip of the case body 11, and a cap 12 is screwed to the male screw 11b. The cap 12 has a substantially conical outer shape. A hole 12b in which a ball lens 12a is attached, a hole 12c in which the tip 2a of the sensor 2 is fitted, and a male screw 11b of the case body 11 are provided at the axial center position. A hole 12e provided with a female screw 12d to be screwed into the hole 12e is formed from the tip side. Next, to incorporate the sensor 2 into the case main body 11, first, the terminals 23 of the light receiving elements of the sensor 2 are connected to the printed circuit board 3 by the lead wires 24, and the terminals 22 on the light emitting element side are directly connected to the printed circuit board 3. Solder to Therefore, the sensor 2 is attached to the printed circuit board 3 via the terminal 22.

Next, the printed circuit board 3 is mounted on the case body 11.
The sensor 2 is inserted from the rear end side first, and is pushed into the case main body 11 while both side edges are fitted into the grooves 11 a of the case main body 11 by light press-fitting. Then, the sensor 2 reaches the inside of the cap 12 screwed to the tip of the case main body 11, and the tip 2a is fitted into the hole 12c of the cap 12, and the step 2b is brought into contact with the step 12f of the cap 12. By doing so, positioning with the cap 12 is performed. At the same time, the tip of the sensor 2 is
2 and is held in the case body 11 by attaching the rear end side to the printed circuit board 3 via the terminal 22 of the light emitting element. When such a barcode reader scans by applying the ball lens 12a to a barcode surface (not shown), light of the light emitting element emitted from the tip of the sensor 2 is condensed by the ball lens 12a and irradiates the barcode surface. . Then, the reflected light is transmitted to the ball lens 12 again.
The bar code signal condensed at a and reaching the internal light receiving element from the tip of the sensor 2 is read.

[0005]

By the way, in order to obtain good optical characteristics in such a bar code sensor, the sensor 2 is designed so that the relative position between the tip of the sensor 2 and the ball lens 12a does not come around due to vibration or the like. Must be fixed to the step 12f of the cap 12 with a certain amount of force. However, in the above-described sensor holding structure, the terminal 22 for the light emitting element at one end of the sensor 2 is directly soldered to the printed circuit board 3 and the sensor 2 is pressed against the cap 12 by the printed circuit board 3 via the fragile terminal 22. It is what you do. Therefore, the pressing force against the cap 12 cannot be made sufficiently large, and the positioning and fixing of the sensor cannot be performed reliably. Therefore, the position of the sensor may fluctuate due to external force such as vibration, and the optical characteristics may be degraded due to the positional relationship of the optical system.
Further, there is a possibility that the terminal 22 may be broken due to a stress applied by vibration or the like, or a soldered portion with the printed circuit board 3 may be separated. Further, at the time of assembly, the cap 12 and the sensor 2
The reaction force from the cap 12 generated when the
Since the light-emitting element is constantly applied to the terminal 22 of the light-emitting element, the light-emitting element may move inside the sensor, and the positional relationship of the optical system may be affected. Therefore, it has been difficult to obtain reliable optical characteristics.

The present invention has been made to solve the above-mentioned drawbacks. By holding the sensor in the case body without passing through a printed circuit board, the optical characteristics of the sensor deteriorate due to external force such as vibration. Provided is a sensor holding structure of a bar code reader which is not likely to be generated.

[0007]

According to the present invention, there is provided a cylindrical case body, a rod-shaped sensor having a light-emitting element and a light-receiving element mounted inside the case body, and also mounted and fixed inside the case body. , bar code reader with a printed circuit board for processing electrical signals from the sensor, and the case body one end to a mounting fixed tapered conical cap and fixed ball lens mounted in the hole of the tip of the cap In the inner surface of the case body, the sensor can be moved in the axial direction to the case body.
A holding part for positioning and holding, and an elastic
And push one end of the sensor against the inner surface of the cap.
Rib for positioning and holding the sensor on the cap
Are provided integrally, and the terminals of the sensor and the printed circuit board are electrically connected by a soft lead wire. With the configuration described above, when the sensor is held by the case body, the sensor is positioned and held on the case body by the holding portion, and the tip of the sensor is held by the cap by the cap. , The positioning of the sensor with respect to the cap is ensured. Also, since the respective terminals of the light emitting element and the light receiving element extending from the sensor are connected to the printed circuit board via the lead wires, no excessive stress is applied to the terminals during assembly, and Is
A sensor holding structure for a bar code reader that does not have a risk of deteriorating the optical characteristics of the sensor even with external force such as vibration is obtained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B show a barcode reader having the sensor holding structure of the present invention. The bar code reader 4 has a vertically divided case body 5a,
5b, and one case body 5a has a ball lens 6a
6, sensor 7 and printed circuit board 8 with
a, 8b are provided. The side 51 of the case body 5a is provided with a hole 51a for exposing the operation part of the switch 9 mounted on the printed circuit board 8a to the outside. A support piece 51b for supporting the printed circuit board 8a is provided near the side portion 51. Also, the case body 5a
A groove 5 for inserting the cap 6 is
2a is formed. Further, a holding portion 54 having a rectangular cylindrical shape is provided on the bottom 53 of the case body 5a close to the tip 52.
Is erected. The front and rear walls 54a of the holding portion 54,
A concave portion 54c into which the sensor 7 is fitted is provided at an upper end portion of the concave portion 54b.
Are formed so that the axis is aligned with the central axis of the concave portion 52 a of the tip end portion 52. Also, both left and right walls 54d, 54 of the holding portion 54
As shown in FIG. 2 (b), a projection 54f protrudes from e. The lock plate 55 is engaged with the projection 54f, and holds the sensor 7 on the holding portion 54. The lock plate 55 is formed in a substantially U-shape.
5a is an engagement hole 55b that engages with the projection 54f of the holding portion 54.
Is provided. Further, from the bottom 53 of the case body 5a separated from the holding portion 54, a plate-like rib 56 having elasticity is provided upright so as to be located on an extension of the central axis of the concave portion 54c of the holding portion 54. I have. On the other hand, the case body 5a
The case main body 5b is provided with a concave groove 57a into which the cap 6 is fitted at the front end 57, and a support wall 58a is erected on the bottom 58 so as to correspond to the front wall 54a of the holding portion 54 of the case main body 5a. ing.

The tip parts 52 of the case main bodies 5a and 5b,
The cap 6 attached to the 57 has a cylindrical shape with a tapered portion 61 attached to the front end side so as to have a tapered shape, and a flange portion 62 protruding from the outer periphery of the rear end. At the axial center position of the cap 6, a hole 63 for mounting the ball lens 6a from the front end side, a hole 64 for fitting the front end of the sensor 7, and a hole 65 formed larger than the outer dimensions of the sensor 7 and opening to the rear end side. Is provided. The dimensions of the flange 62 are
When the cap 6 is attached to the case bodies 5a and 5b, a gap 52b formed by the front end portion 52 of the case body 5a and the front wall 54a of the holding portion 54, and a front end portion 57 of the case body 5b and the support wall 58a are formed. Flange 6 in gap 57b
2 is set so as to be fitted without play.
The sensor 7 is the same as that shown in the conventional example. A step 7b is provided on the front end 7a side, and a terminal 7c of the light emitting element and a terminal 7d of the light receiving element are extended on the rear end side. Next, in the above configuration, the sensor 7 is attached to the case main bodies 5a and 5b.
First, the terminal 7c of the light emitting element of the sensor 7
The terminal 7d of the light receiving element is connected to the printed board 8b by a flexible lead wire 7f cut to an appropriate length. Next, the sensor 7 is inserted into the case main body 5a together with the printed circuit board 8b in a state where the cap 6 is put on the tip side of the sensor 7 and the tip 7a is fitted into the hole 64. In this case, the cap 6 is connected to the tip 5 of the case body 5a.
The body portion is inserted into the second concave groove 52a, and the flange portion 62 is fitted into the gap 52b. The sensor 7 has a central portion fitted into the concave portion 54c of the holding portion 54 and a rear end portion 7e.
Is inserted into the case body 5a while abutting against the rib 56 to bend the rib 56 backward. For this reason, the sensor 7 is positioned with respect to the cap 6 by pressing the step 7 b on the distal end side against the step 66 of the cap 6 by the elastic return force of the rib 56.

Thereafter, as shown in FIG.
The lock plate 55 has an engagement hole 55b and a projection 54f.
The sensor 7 is held in the recess 54 c by the lock plate 55. Next, after attaching the printed circuit boards 8a and 8b to the case body 5a, as shown in FIG. 2A, the other case body 5b is assembled and fixed to the case body 5a. As described above, in the sensor holding structure of the present invention, when the cap 6, the sensor 7, and the printed circuit board 8b are assembled into the case main body 5a, the sensor 7 is compared in the arrow X direction (see FIG. 1) by the elastic return force of the rib 56. The stepped portion 7b is pressed by an extremely large force, and the stepped portion 7b is brought into contact with the stepped portion 66 of the cap 6, so that the positioning can be reliably performed.

When the sensor 7 is fitted into the concave portion 54c of the holding portion 54, the sensor 7 is positioned in the arrow Y direction perpendicular to the arrow X direction, and is also positioned in the arrow Z direction by the lock plate 55. Instead of the lock plate 55, a lock piece (not shown) is integrally provided from the inner wall surface on the case body 5b side toward the upper surface of the sensor 7 inserted into the holding portion 54, and the case body 5
By combining a and 5b, the design can be changed so that the sensor 7 is sandwiched between the lock piece and the holding portion 54, and the number of parts and the number of assembly steps can be reduced.

[0012]

As described above, in the sensor holding structure of the present invention, the case body is provided with a rib which elastically engages with the rear end of the sensor, thereby pressing the front end of the sensor against the cap. The pressing force of the sensor increases, and the positioning and fixing of the sensor can be ensured. In addition, since the sensor is elastically held between the cap and the rib and the terminal is connected to the printed board via a flexible lead wire, vibration of the board and the like is not directly transmitted to the sensor. In addition, the present invention provides a bar code reader sensor holding structure capable of obtaining stable optical characteristics with respect to external force such as vibration since no stress is applied to the sensor terminals.

[Brief description of the drawings]

FIG. 1A is a plan view of a main part of an embodiment, and FIG.
2 is a sectional side view of a main part of the embodiment.

[2] 2 (a) is a side sectional view showing the assembled state of the embodiment, FIG. (B) is A-A arrow view in FIG. 2 (a).

FIG. 3 is an explanatory view of a conventional type.

[Explanation of symbols]

 1,4 Barcode reader 11,5a, 5b Case body 12,6 Cap 2,7 Sensor 2a, 7a Tip 3,8a, 8b Printed circuit board 52,57 Tip 54 Holder 56 Rib 7c, 7d Terminal 7e Rear end 7f lead wire

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06K 7/10

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical case main body, a rod-shaped sensor having a light-emitting element and a light-receiving element mounted inside the case main body, and also mounted and fixed inside the case main body.
It is, fixedly attached to the hole of the tip of the the printed circuit board for processing electrical signals from the sensor, which fixed tapered conical cap and the cap attached to one end of the case body
A bar code reader provided with a ball lens provided with the sensor.
Holder for positioning and holding the base body so that it can move in the axial direction
And one end of the sensor elastically engaged with the other end of the sensor.
Press the end against the inner surface of the cap to attach the sensor to the key.
A sensor holding structure for a bar code reader , wherein a rib for positioning and holding the cap is integrally provided, and a terminal of the sensor and the printed circuit board are electrically connected by a soft lead wire.