JP2003288541A - Unit and mechanism for bar code read - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bar code read unit and a mechanism which are reducible in terms of occupation space and advantageously made small-sized and lightweight. <P>SOLUTION: The bar code read unit 16 has a single housing 18 formed in a rectangular plate shape having a thickness and this housing 18 is put in a storage recessed part 1204. In the housing 18, a light source 20, a projection lens 22, an aperture member 23, a condenser lens 24, a photodetecting element 26, etc., are placed. A die pad 1802 formed in a rectangular plate shape is placed inside the housing 18. A 1st cavity 1806 is formed of one surface of the die pad 1802 in the housing 18 and a 2nd cavity 1808 which is partitioned from the 1st cavity is formed of the other surface of the die pad 1802 in the housing 18. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar code reading mechanism which scans light emitted from a light source to irradiate the bar code and detects the reflected light by a light receiving element, and a bar code incorporated in the bar code reading mechanism. Regarding the reading unit.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing an example of a conventional bar code reading mechanism. Conventional barcode reading mechanism 100
Includes a light emitting element 1, a light projecting lens 2, a light scanning unit 3, a condensing lens 4, a bandpass filter 5, and a light receiving element 6. The optical scanning unit 3 is composed of a movable mirror 3A that is swingably supported by a swing shaft 3D, a magnet 3B attached to the movable mirror 3A, and a coil 3C that attracts and repels the magnet 3B. There is. The emitted light emitted from the light emitting element 1 is focused by the light projecting lens 2, hits the movable mirror 3, is reflected, and is irradiated on the barcode 7. The movable mirror 3A is swung by passing a current whose positive and negative polarities are reversed in the coil 3C, and the light reflected by the movable mirror 3 is also swung thereby to scan the barcode 7. The light applied to the bar code 7 becomes reflected light whose amount of light changes depending on the black and white of the bar code 7, is condensed by the condenser lens 4, and is passed through the band pass filter 5
Then, natural light other than the frequency of the emitted light is cut and received by the light receiving element 6. The light receiving element 6 outputs a change in the black and white light amount of the barcode 7 as a voltage signal.

Further, Japanese Patent Laid-Open No. 2001-351063 discloses a bar code reading device in which a laser diode, a rotating mirror and a photo sensor are attached to one holding member, and the rotating mirror serves to detect the laser diode. Scan the laser beam toward the bar code,
A configuration is disclosed in which the photo sensor detects reflected light from a barcode.

[0004]

However, in the former barcode reading mechanism, for example, the light emitting element 1 is housed in a can type package,
The light receiving element 6 is housed in a package independent of the light emitting element 1. Therefore, when arranging the light emitting element and the light receiving element, an occupying space considering the size of each package and the space between the packages of these two elements is required, and the weight of the package of these two elements also needs to be considered. There is a disadvantage in reducing the size and weight of the barcode reading mechanism.
Such a drawback similarly occurs in the latter bar code reader. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bar code reading unit and mechanism which are advantageous in reducing the occupied space and achieving size reduction and weight reduction. .

[0005]

In order to achieve the above object, the bar code reading unit of the present invention deflects the emitted light emitted from the light source by the optical scanning means to scan the bar code, and the bar code is used. A barcode reading unit used when detecting reflected light reflected by a light receiving element, comprising a single housing, the light source and a light receiving element housed and held in the single housing, A plate-shaped die pad is disposed inside the housing, a first cavity is formed inside the housing by one surface of the die pad, and a first cavity is partitioned by the other surface of the die pad. Two cavities are formed, the light source is disposed in the first cavity so that the emitted light is emitted to the outside of the housing, and the light receiving element can receive the reflected light from the outside of the housing. As described above, the housing is molded by using synthetic resin or ceramic, and the die pad is arranged by embedding the die pad around the housing during molding of the housing. It is characterized by being

Further, in the bar code reading mechanism of the present invention, the emitted light emitted from the light source is deflected by the optical scanning means to scan the bar code, and the reflected light reflected by the bar code is detected by the light receiving element. A bar code reading mechanism comprising: a bar code reading unit having the light source and a light receiving element; the optical scanning means; and a case accommodating the bar code reading unit and the optical scanning means. The unit includes a single housing, the light source and the light receiving element housed and held in the single housing, a plate-shaped die pad is arranged inside the housing,
One surface of the die pad forms a first cavity inside the housing, and the other surface of the die pad forms a second cavity partitioned from the first cavity, and the light emitted from the light source is the housing. The light receiving element is arranged in the first cavity so as to be emitted to the outside of the body, the light receiving element is arranged in the second cavity so as to receive the reflected light from the outside of the housing, and the housing is composed. The die pad is molded by using resin or ceramic, and the die pad is disposed by embedding the periphery of the die pad in the casing at the time of molding the casing, and the barcode reading unit is provided in a housing recess provided in the case. The emitted light emitted from the light source in a state where the barcode reading unit is accommodated in the accommodation recess is guided to the optical scanning unit,
Light reflected from the outside of the housing is configured to be guided to the light receiving element.

Therefore, according to the present invention, a plate-shaped die pad is disposed inside a single housing, and one surface of this die pad forms a first cavity inside the housing, and A second cavity that is partitioned from the first cavity by the other surface is formed, and the light source is arranged in the first cavity so that the emitted light is emitted to the outside of the housing, and the light receiving element is provided. By arranging in the second cavity so that the reflected light can be received from the outside of the housing, the individual packages conventionally required for the light source and the light receiving element can be reduced, and the packages occupied by each package can be reduced. The space can be reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a bar code reading unit and a bar code reading mechanism according to the present invention will be described below in detail with reference to the drawings. 1 is a cross-sectional view showing a configuration of a bar code reading mechanism according to an embodiment of the present invention, FIG. 2 is a view as seen from an arrow A in FIG. 1, and FIG. 3 is a view as seen from an arrow B in FIG. As shown in FIGS. 1 to 3, the barcode reading mechanism 10 includes
Case 12 and optical scanning means 14 housed in case 12
And a barcode reading unit 16 are provided. The optical scanning unit 14 is housed in a housing recess 1202 formed in the case 12, and the bar code reading unit 16 is housed in the housing recess 1 formed in the case 12.
It is housed in 204. The accommodation recess 1202 and the accommodation recess 1204 are in communication with each other, and the accommodation recess 1
More specifically, 202 is formed by the wall portion of the case 12 and the housing 18 of the barcode reading unit 16, and is formed in an open state on the surface of the case 12 through the opening 1206. The optical scanning unit 14 swings a swing mirror 1402 arranged on the optical path of the emitted light emitted from the bar code reading unit 16, and swings the swing mirror 1402 around a support shaft 1404 by a predetermined laser. Corners (eg 90
A swing mechanism 1406 that deflects and scans the emitted light by swinging the emitted light in a range of 10 degrees) so that the deflected and scanned emitted light passes through the opening 1206 and is applied to the barcode. It is configured.

The bar code reading unit 16 is provided with a single housing 18 formed in the shape of a rectangular plate having a thickness, and the housing 18 is housed in the housing recess 1204.
4A is a cross-sectional view showing the structure of the barcode reading unit in this embodiment mode, and FIG. 4B is a cross-sectional view of FIG. 4A.
1 view, FIG. 5 (C) is a view taken along arrow X2 of FIG. 4 (A), FIG.
5D is a view taken in the direction of arrow Y1 of FIG. 5C, and FIG. 6 is a view taken in the direction of arrow Y2 of FIG. 5D. 4 (A), (B), FIG. 5 (C),
As shown in (D), the housing 18 includes a light source 20, a light projecting lens 22, an aperture member 23, a condenser lens 24,
A light receiving element 26 and the like are provided. The light projecting lens 22, the condenser lens 24, and the light receiving element 26 are the light source 20.
Light emitted from the projection lens 22 and the aperture member 2
It is configured so as to be guided to the optical scanning means 14 via 3. In addition, it is arranged so that the reflected light reflected from the barcode is condensed by the condenser lens 24 and guided to the light receiving element 26.

Inside the case 18, a die pad 1802 formed in a rectangular plate shape is arranged. A first cavity 1806 is formed inside the housing 18 by one surface of the die pad 1802, and a second cavity that is partitioned from the first cavity 1806 inside the housing 18 by the other surface of the die pad 1802. 1808
Are formed. The die pad 1802 is made of copper or the like, which is a conductive member similar to the IC lead frame. The first cavity 1806 is formed in an open shape on the outer surface of the housing 18 through the first opening 1810 on one surface side of the die pad 1802.
In other words, it is formed in an open shape on the outer surface of the case 12, and the first cavity 1806 is provided so as to communicate with the optical scanning means 14 via the notch 1811.
The first opening 1810 of the first cavity 1806 faces the bottom surface of the accommodation recess 1204. The light projecting lens 22 is fixed to an approximately central portion of one surface of the die pad 1802 with an adhesive in a state of being positioned so that its optical axis coincides with the central axis passing through the center of the notch 1811. .

The aperture member 23 is fixed on one surface of the die pad 1802 at an intermediate position between the notch 1811 and the light projecting lens 22 with an adhesive. The aperture member 28 is formed with an aperture 2302 that shapes the shape of the light beam emitted from the light source 20 via the light projecting lens 22. The central axis passing through the center of the aperture 2302 is the projection lens 22.
It is configured to match the optical axis of. Further, on the side of the die pad 1802 in the first cavity 1806,
Three wire bond pads 1804A to 1804C
Are provided side by side, and three lead terminals 1806A to 1806C connected to the wire bond pads 1804A to 1804C are provided on the outside of the housing 18.

The light source 20 comprises a monitor photodetector 2002 formed in a rectangular plate shape, and a light emitting element 2004 formed in the rectangular plate shape and provided in the monitor photodetector 2002. The monitor photodetector 2002 is attached to one surface of the die pad 1802 at a position away from the notch 1811 and the light projecting lens 22. The monitor photodetector 2002 and the die pad 1802
Are in a mutually conductive state by applying silver paste or the like between them. The die pad 1802 is connected to the wire bond pad 1804A by a wire as a common electrode, and the light emitting device 200
4 is connected to the wire bond pad 1804B by a wire, and the monitor photodetector 2002 is connected to the wire bond pad 1804C by a wire. The drive current is supplied to the light emitting element 2004, and the detection current is output from the monitor photodetector 2002.
6C.

The second cavity 1808 has a second opening 181 on the other surface side of the die pad 1802.
It is formed in an open shape on the outer surface of the housing 18 via 2, and in other words is formed on the outer surface of the case 12 in an open shape. The notch 1811 and the second opening 1812 are provided on two surfaces of the housing 18 that are orthogonal to each other, and the second opening 1812 is substantially the same as the opening 1206 of the case 12. It is provided on a plane. The light receiving lens 24 is attached to the second opening 1812. The light receiving element 26 is attached to the other surface side of the die pad 1802 on the second cavity 1808 side and is configured to detect the reflected light condensed by the light receiving lens 24. The light receiving element 26 and the die pad 1802 are electrically connected to each other by applying silver paste or the like between them. Also,
One wire bond pad 1804D is provided on the side of the die pad 1802 in the second cavity 1808, and the light receiving element 26 includes the wire bond pad 1802.
Wired to 4D. A lead terminal 1806D connected to the wire bond pad 1804D is provided outside the housing 18. Therefore, the detection current is output from the light receiving element 26 via the lead terminals 1806A and 1806D.

Next, the manufacture of the bar code reading unit 16 will be described in the order of molding the casing 18 and assembling the bar code reading unit 16. The housing 18 is manufactured by molding resin or ceramic. At this time, the die pad 1802 is incorporated into the housing 18, so that the first and second cavities 1806 and 1808 and the first opening portion 1 are formed at the same time as the molding.
810, the second opening 1812, and the cutout 1811 are formed, and the wire bond pads 1804A to 1804 are formed.
4D, the lead terminals 1806A to 1806D are the housing 18
It will be in the state of being incorporated into.

Next, the assembly of the bar code reading mechanism 10 and the bar code reading unit 16 will be described with reference to FIGS. As shown in FIGS. 4A and 4B, silver paste is applied to a portion on one surface of the die pad 1802 to which the light source 20 is attached, and the light source 20 is coated with the silver paste of the die pad 1802. Place it on the coated area for positioning. This positioning is performed by the light source 20.
The optical path of is aligned with the central axis passing through the center of the cutout 1811. Then, the light source 20 is attached to the die pad 1802 by curing the silver paste.

Next, as shown in FIGS. 4 (A) and 4 (B),
The die pad 1 to which the aperture member 23 is attached
A UV curable adhesive is applied to a location on one surface of 802, and the aperture member 23 is placed on the location to perform positioning. This positioning is performed by the aperture 230.
The central axis of 2 corresponds to the central axis of the notch 1811. Then, the ultraviolet light is applied to the aperture member 2
By irradiating the adhesive from above to cure the adhesive, the aperture member 23 is moved to the die pad 1802.
Attach to. Next, as shown in FIGS. 4 (A) and 4 (B),
The die pad 180 to which the light projecting lens 22 is attached
A UV-curable adhesive is applied to a location on one surface of No. 2 and the light projecting lens 22 is placed on the location and positioned. This positioning is performed so that the optical axis of the light projecting lens 22 coincides with the optical path of the light source 20 and the central axis of the aperture 2302. Then, by irradiating the adhesive with ultraviolet light from above the light projecting lens 22 to cure the adhesive, the light projecting lens 22 is attached to the die pad 1.
Attach to 802.

Next, as shown in FIGS. 4 (A) and 4 (B),
A silver paste is applied to a portion of the other surface of the die pad 1802 where the light receiving element 26 should be attached, and the light receiving element 26 is placed and cured at this position.
Are attached to the die pad 1802. And FIG.
As shown in (A), (B), FIG. 5 (C), and FIG. 6, one surface of the die pad 1802 and the wire bond pad 1804A are connected by a wire, and the light emitting element 2004 and the wire bond pad 1804B are connected. Are connected with a wire, the monitor photodetector 2002 and the wire bond pad 1804C are connected with a wire, and the light receiving element 26 and the wire bond pad 1804D are connected with a wire.

Next, FIGS. 4 (A), 4 (B), 5 (C),
(D), as shown in FIG. 6, after the ultraviolet curable adhesive is applied to the location of the second opening 1812, the condenser lens 24 is placed, and the ultraviolet light is directed above the condenser lens 24. The condensing lens 24 is attached to the housing 18 by irradiating the adhesive from the above to cure the adhesive. In this way, the barcode reading unit 16 is completed.

Then, as shown in FIGS. 1 and 9, the bar code reading unit 16 is housed in the housing recess 1202 of the case 12 to complete the assembly of the bar code reading mechanism 10. In this state, in the present embodiment, both the swing mirror 1402 and the light receiving lens 24 are oriented in the same direction. The swing mirror 1402 of the optical scanning unit 14 is the swing mirror 1
When 402 is located at the center position of the swing range, it forms an angle of about 45 degrees with respect to the optical path of the emitted light emitted from the notch 1811 of the barcode reading unit 16.

Next, a control circuit for controlling the bar code reading mechanism 10 thus assembled will be described. As shown in FIG. 7, the barcode reading unit 1
6 lead terminals 1804A to 1806D are control circuits 2
It is connected to 0. Thereby, the lead terminal 18
A drive current is supplied from the control circuit 20 to the light emitting element 2004 via 04A and 1804B, and a detection current from the monitor photodetector 2002 is transmitted via the lead terminals 1804A and 1804C to the control circuit 2.
0 to the lead terminals 1804A, 1804D
The detection current from the light receiving element 26 is output to the control circuit 20 via the.

The control circuit 20 controls the drive current to the light emitting element 2004 based on the detected current from the monitor photodetector 2002, and
The barcode is read based on the detected current from the detection element 26. Further, the control circuit 20 is configured to control the swing mechanism 1406 of the optical scanning means 14 to swing the swing mirror 1402.

Next, the operation of the bar code reading mechanism 10 will be described. As shown in FIG. 7, with the oscillating mirror 1402 and the condenser lens 24 facing the barcode 30, the light source 20 is operated under the control of the control circuit 20 to emit emitted light. The emitted light is collimated by the light projecting lens 22, shaped by the aperture 2302 of the aperture member 23, and reaches the swing mirror 1402 through the notch 23. When the swing mirror 1402 is swung by the swing mechanism 1406 within the range of the laser swing angle φ, the emitted light reflected by the swing mirror 1402 scans the barcode 30. The emitted light reflected by the barcode 30 enters the condenser lens 24 as return light and is condensed on the light receiving element 26. The light receiving element 26 detects the collected return light and outputs a detection current to the control circuit 20. The control circuit 20 reads the barcode 30 based on the detected current.

As described above in detail, according to the present embodiment, the plate-shaped die pad 1802 is provided inside the single housing 18.
And one side of the die pad 1802 forms a first cavity 1806 inside the housing 18, and the other side of the die pad 1802 forms a second cavity 1808 partitioned from the first cavity 1806. Then, the light source 20 is arranged in the first cavity 1806 so that the emitted light is emitted to the outside of the housing 18, and the light receiving element 26 can receive the reflected light from the outside of the housing 18. Thus, the second cavity 1808 is arranged. As a result, it is possible to reduce the number of individual packages that the light source 20 and the light receiving element 26 have conventionally required, and to reduce the space occupied by each package, and to reduce the size of the bar code reading unit and thus the bar code reading mechanism. This is advantageous in achieving weight reduction and weight reduction.
Further, since the die pad 1802 is arranged by embedding the periphery of the die pad 1802 in the casing 18 when the casing 18 is molded, the casing 18 having the die pad 1802 can be easily obtained, and the bar code reading unit and thus the bar code reading unit. This is advantageous in reducing the cost of the barcode reading mechanism. Further, the light source 20 and the light receiving element 26 are connected to the die pad 18
First and second cavities 180 partitioned by 02
Since they are housed in Nos. 6 and 1808, there is no possibility that they will be adversely affected by stray light, which is advantageous in improving the stability of the reading operation.

[0024]

As described above, according to the bar code reading unit and the bar code reading mechanism of the present invention, the occupied space can be reduced, which is advantageous in terms of size reduction and weight reduction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a barcode reading mechanism according to an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a view on arrow B of FIG.

4A is a cross-sectional view showing the configuration of the barcode reading unit according to the present embodiment, and FIG. 4B is a view taken in the direction of arrow X1 of FIG.

5 (C) is a view on arrow X2 in FIG. 4 (A), and FIG. 5 (D) is a view on arrow Y1 in FIG. 4 (C).

FIG. 6 is a view on arrow Y2 in FIG.

FIG. 7 is a configuration diagram of a barcode reading mechanism in a completed state.

FIG. 8 is a configuration diagram showing an example of a conventional barcode reading mechanism.

[Explanation of symbols]

10 ... bar code reading mechanism, 16 ... bar code reading unit, 18 ... housing, 1802 ... die pad, 1
802A ... Lens mounting opening, 1806 ... First cavity, 1808 ... Second cavity, 1811 ... Notch, 1810 ... First opening, 1812 ... Second opening, 20 ... Light source, 22 ... ... Projecting lens, 23 ... Aperture member, 2302 ... Aperture, 24 ... Condensing lens, 26 ... Light receiving element.

Continued front page    (72) Inventor Hisataka Izawa             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Hiroyuki Miyahara             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Eiji Kato             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Satoru Komuro             3-53-2, Shiratori, Shiroishi, Miyagi Prefecture Sony             Shiraishi Semiconductor Co., Ltd. (72) Inventor Makoto Futaki             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F term (reference) 5B072 AA03 CC24 DD02 JJ09 LL04                       LL07 LL11 LL18                 5F089 BA10 BB03 BC25 CA20

Claims (21)

[Claims] 1. A bar code reading unit used when light emitted from a light source is deflected by an optical scanning means to scan a bar code, and reflected light reflected by the bar code is detected by a light receiving element. A single housing, and the light source and the light receiving element housed and held in the single housing, and a plate-shaped die pad is disposed inside the housing, and one of the die pads Surface of the die pad forms a first cavity inside the housing, and the other surface of the die pad forms the first cavity.
A second cavity separated from the cavity is formed, the light source is disposed in the first cavity so that the emitted light is emitted to the outside of the housing, and the light receiving element is provided from the outside of the housing. The housing is disposed in the second cavity so as to receive reflected light, the housing is molded using a synthetic resin or ceramic, and the die pad has its periphery embedded in the housing during molding of the housing. The barcode reading unit is characterized in that it is arranged in. 2. The bar code reading unit according to claim 1, wherein the light source is attached to one surface of the die pad. 3. A light projecting lens for collimating light emitted from the light source into parallel light is attached to one surface of the die pad in the first cavity.
Bar code reading unit described. 4. The bar code reader according to claim 3, wherein an aperture member that shapes the spot shape of the emitted light that has passed through the light projecting lens is attached to one surface of the die pad. unit. 5. The bar according to claim 1, wherein the housing is provided with a notch that guides light emitted from the light source to the outside of the housing after passing through the aperture member. Code reading unit. 6. The bar code reading unit according to claim 1, wherein the light receiving element is attached to the other surface of the die pad. 7. A first opening for opening the first cavity to the outside of the housing is formed at a housing portion facing one surface of the die pad.
Bar code reading unit described. 8. The second opening for opening the second cavity to the outside of the housing is formed at a housing location facing the other surface of the die pad.
Bar code reading unit described. 9. The bar code reading unit according to claim 8, wherein a condenser lens is attached to the second opening. 10. The housing is provided with a notch that guides light emitted from the light source to the outside of the housing after passing through the aperture member, and is provided at a housing portion facing the other surface of the die pad. Has a second opening for opening the second cavity to the outside of the housing, the housing is formed in a rectangular plate shape having a thickness, and the notch and the second opening are orthogonal to each other in the housing. The barcode reading unit according to claim 1, wherein the barcode reading unit is provided on two surfaces of the barcode reading unit. 11. A bar code reading mechanism for deflecting emitted light emitted from a light source by an optical scanning means to scan on a barcode and detecting reflected light reflected by the barcode by a light receiving element. A bar code reading unit having the light source and the light receiving element, the optical scanning unit, and a case accommodating the bar code reading unit and the optical scanning unit are provided, and the bar code reading unit is a single housing. The light source and the light receiving element housed and held in the single housing are provided, and a plate-shaped die pad is disposed inside the housing, and one surface of the die pad provides a first inside of the housing. A cavity is formed, and a second cavity that is partitioned from the first cavity by the other surface of the die pad is formed, and the emitted light of the light source is emitted to the outside of the housing. Is disposed in the first cavity, the light receiving element is disposed in the second cavity so as to receive the reflected light from the outside of the housing, and the housing is made of synthetic resin or ceramic. The die pad is disposed by surrounding the periphery of the die pad when the die is molded, and the barcode reading unit is housed in a housing recess provided in the case. The emitted light emitted from the light source with the unit housed in the housing recess is guided to the optical scanning unit, and the reflected light from the outside of the housing is guided to the light receiving element. A bar code reading mechanism characterized by the above. 12. The bar code reading mechanism according to claim 11, wherein the light source is attached to one surface of the die pad. 13. A light projecting lens for collimating light emitted from the light source into parallel light is attached to one surface of the die pad in the first cavity. Bar code reading mechanism. 14. The bar code reader according to claim 13, wherein an aperture member that shapes the spot shape of the emitted light that has passed through the light projecting lens is attached to one surface of the die pad. mechanism. 15. The bar according to claim 11, wherein the housing is provided with a notch that guides light emitted from the light source to the outside of the housing after passing through the aperture member. Code reading mechanism. 16. The bar code reading mechanism according to claim 11, wherein the light receiving element is attached to the other surface of the die pad. 17. The first opening for opening the first cavity to the outside of the housing is formed at a housing portion facing one surface of the die pad. Bar code reading mechanism. 18. The second opening for opening the second cavity to the outside of the housing is formed at a housing portion facing the other surface of the die pad. Bar code reading mechanism. 19. The bar code reading mechanism according to claim 18, wherein a condenser lens is attached to the second opening. 20. The casing is provided with a notch that guides light emitted from the light source to the outside of the casing after passing through the aperture member, and is provided at a portion of the casing facing the other surface of the die pad. Has a second opening for opening the second cavity to the outside of the housing, the housing is formed in a rectangular plate shape having a thickness, and the notch and the second opening are orthogonal to each other in the housing. The bar code reading mechanism according to claim 11, wherein the bar code reading mechanism is provided on two surfaces of the bar code reader. 21. A housing opening facing the other surface of the die pad is formed with a second opening for opening the second cavity to the outside of the housing, and the housing emits light from the optical scanning means. 12. The bar code reading mechanism according to claim 11, wherein the bar code reading mechanism has an opening that emits light, and the opening and the second opening are provided on substantially the same plane.