JP7744572B2 - Information reading device - Google Patents

Description

The technology disclosed in this specification relates to an information reading device that reads information.

The mobile terminal disclosed in Patent Document 1 comprises a main board, a button unit that accepts instructions from the user, a sub-board that transmits signals input from the button unit to the main board, and a bracket that holds the sub-board to the housing of the mobile terminal. The sub-board comprises a connection terminal portion that faces the main board, and an input board portion that faces the button unit. The tip of the connection terminal portion is formed with multiple pins that are electrically connected to the main board while being elastically pressed against it.

Special Publication No. 2013-541265

In the technology of Patent Document 1, the pins are elastically pressed against the main board. Therefore, if the mobile terminal is dropped, the pins may slide against the main board. For example, if the pins dig into the main board to a large extent, this sliding may accelerate wear on the surface of the main board.

For example, one possible method is to adjust the elastic force that applies elastic pressure to the pin against the main board to reduce the amount of biting. However, this method requires adjusting the length of the pin, the thickness of the main board, etc.

Another possible solution is to increase the cross-sectional area of the pin to reduce the amount of biting. However, this method also requires adjusting the pin thickness.

It is also conceivable to modify the configuration disclosed in Patent Document 1 so that a pin is provided on the main board and is elastically pressed against the sub-board. Even with this configuration, as with the above, the pin may slide against the sub-board, potentially accelerating wear on the surface of the sub-board.

This specification provides technology to prevent accelerated wear on the surface of the sub-board caused by dropping an information reading device.

The information reading device disclosed in this specification comprises a housing, a reading unit for reading information, a main board lying within the housing and controlling the reading unit, a sub-board including a first plate facing the main board and a second plate facing a side wall of the housing, a block supporting the sub-board within the housing, double-sided tape bonding the first plate of the sub-board to the block, and a button for receiving a command to read information, the button having its back surface facing the second plate and its front surface exposed to the outside through the side wall. The first plate has a pair of contacts formed thereon that contact a pair of terminals extending from the main board, and the second plate has a first pattern extending from one of the pair of contacts and a second pattern extending from the other of the pair of contacts. When the button is pressed and the back surface of the button comes into contact with the second plate, the first pattern and the second pattern are conductive, and the thickness of the double-sided tape is a predetermined thickness that determines the amount of penetration of the pair of terminals into the pair of contacts to be equal to or less than a specific amount.

One method for supporting a sub-board within a housing is to use double-sided tape to attach the first plate of the sub-board to the block. The inventor decided to adopt this method. In this method, the double-sided tape is compressed by the force of the terminals pressing against the first plate. The inventor discovered that when the double-sided tape is thick, the amount of compression of the double-sided tape increases, which in turn increases the amount by which the terminals dig into the first plate, accelerating wear on the surface of the first plate. The inventor then came up with the idea of reducing the thickness of the double-sided tape. Specifically, he came up with the idea of setting the thickness of the double-sided tape to a predetermined thickness that limits the amount of digging of the pair of terminals into the pair of contacts to a specific amount or less. Here, the predetermined thickness is, for example, equal to or less than the thickness of the first plate. The predetermined thickness is also, for example, 0.1 millimeters or less. This makes it possible to prevent accelerated wear on the pair of contacts on the first plate.

Another information reading device disclosed in this specification comprises a housing, a reading unit for reading information, a main board lying within the housing and controlling the reading unit, a sub-board including a first plate facing the main board and a second plate facing a side wall of the housing, a block supporting the sub-board within the housing, double-sided tape bonding the first plate of the sub-board to the block, and a button for receiving instructions to read information, the back surface of which faces the second plate and the front surface of which is exposed to the outside from the side wall, and the first plate includes A pair of contacts is formed that contacts a pair of terminals extending from the main board, and the second plate is formed with a first pattern extending from one of the pair of contacts and a second pattern extending from the other of the pair of contacts. When the button is pressed and the back surface of the button contacts the second plate, the first pattern and the second pattern become conductive. When viewed from the contacts, the double-sided tape is arranged in a second area different from the first area in which the contacts are arranged, and the first plate and the block are in contact in the first area.

As mentioned above, the reason the amount by which the terminal bites into the first plate increases is because the amount of compression of the double-sided tape increases. With the above configuration, even if the terminal presses against the first plate, the first plate is in contact with the block in the first area, so compression of the double-sided tape placed in the second area can be suppressed. By suppressing compression of the double-sided tape, the amount by which the terminal bites into the first plate is also suppressed. Accelerated wear of the pair of contact points on the first plate can be suppressed.

FIG. An exploded view of the trigger button is shown. FIG. 1 shows an exploded view of a sub-board assembly. FIG. 10 is a perspective view of the connection configuration between the sub-board assembly and the main board. 10 is an enlarged cross-sectional view of a connection configuration between a main board and a sub-board. FIG. A conceptual diagram showing the case where the terminal is deeply embedded in the contact point of the sub-board is shown. A conceptual diagram showing a case where the amount of penetration of the terminal into the contact point of the sub-board is small is shown. FIG. 10 is an exploded view of a sub-board assembly according to a second embodiment. FIG. 10 is a partial cross-sectional view of a sub-board assembly according to a second embodiment. FIG. 11 is an exploded view of a sub-board assembly according to a third embodiment. FIG. 10 is a partial cross-sectional view of a sub-board assembly according to a third embodiment.

(First Example)
(Configuration of information reading device 10; FIG. 1)
The information reading device 10 according to this embodiment, shown in FIG. 1, is a device for reading data recorded in an information code (e.g., a barcode). The information reading device 10 includes a display unit 12, a plurality of operation buttons 14, an imaging unit 16 that captures an image of the information code, a trigger button 18 exposed from the side of the information reading device 10, and a housing 20. As shown in FIG. 1, the components 12 to 18 are supported by the housing 20. In response to operation of the trigger button 18, the information reading device 10 activates the imaging unit 16 and captures an image of the information code. The information reading device 10 then reads the data recorded in the captured information code and outputs the data. For example, the information reading device 10 displays the read result (e.g., a character string) represented by the data on the display unit 12. The information reading device 10 also transmits the data to an external device (e.g., a server). In a modified example, the information reading device 10 may extract a character image from the image captured by the imaging unit 16, perform character recognition on the extracted character image, and read the data represented by the character image.

The imaging unit 16 is, for example, a camera such as a CCD image sensor. In a modified example, the imaging unit 16 may be a component including a laser light source and a light receiving unit.

(Button structure: Figures 2 to 5)
Fig. 2 shows an exploded perspective view of the button structure including the trigger button 18. Note that Fig. 2 only shows the main components, and does not show other components (e.g., the main board 40 described below). The internal shape of the housing 20 is also shown in a simplified form.

As shown in Figure 2, the button structure is composed of multiple parts, including a trigger button 18, rubber 22, and a sub-board assembly 30. The trigger button 18 is a resin component. The trigger button 18 is a button for receiving commands to read information. The front surface 18a of the trigger button 18 is exposed to the outside through a hole 20b formed in the side wall 20a of the housing 20. Multiple anti-slip protrusions are formed on the front surface 18a of the trigger button 18 (see Figure 1). The back surface 18b of the trigger button 18 faces the rubber 22.

The rubber 22 is a component made of an elastic material such as rubber. The front surface 22a of the rubber 22 faces the back surface 18b of the trigger button 18. The back surface 22b of the rubber 22 faces the sub-board assembly 30. A conductive member 22c is provided on the back surface 22b of the rubber 22. When the trigger button 18 is not pressed, the conductive member 22c is separated from the sub-board assembly 30. When the trigger button 18 is pressed, the rubber 22 is depressed toward the inside of the housing 20 due to the force pressing the trigger button 18. When the rubber 22 is depressed, the conductive member 22c comes into contact with the sub-board assembly 30. Furthermore, the restoring force of the rubber 22 causes the trigger button 18 to return from a depressed state to its pre-depressed state (i.e., a state in which the conductive member 22c is separated from the sub-board assembly 30).

As shown in Figures 2 and 3, the sub-board assembly 30 is composed of multiple components, including a sub-board 32, double-sided tape 34, and a block 36. The sub-board 32 is a flexible printed circuit board. The sub-board 32 includes a first plate 32a that faces the main board 40 (both not shown in Figures 2 and 3) and a second plate 32b that faces the back surface 22b of the rubber 22. A pair of contacts 32c is formed on the first plate 32a. A first pattern 32d connected to a lead extending from one of the pair of contacts 32c and a second pattern 32e connected to a lead extending from the other of the pair of contacts are formed on the second plate 32b. The first pattern 32d and the second pattern 32e are comb-shaped patterns. The combs of the first pattern 32d are spaced apart from the combs of the second pattern 32e. As described above, when the trigger button 18 is pressed, the conductive member 22c of the rubber 22 comes into contact with both the first pattern 32d and the second pattern 32e. This establishes electrical continuity between the first pattern 32d and the second pattern 32e. Note that the first pattern 32d and the second pattern 32e are not limited to being comb-shaped, and may have other shapes (such as simple lines) that are spaced apart from each other.

The double-sided tape 34 is used to bond the first plate 32a to the base 36a of the block 36. The block 36 is a resin component that is supported on the inner surface of the housing 20. The block 36 is a component that supports the sub-board 32 within the housing 20.

Figure 4 is an assembly diagram of the button structure. As shown in Figure 4, the rubber 22 is sandwiched between the block 36 and the side wall 20a of the housing 20. Also, although not visible in Figure 4, the flange 18c (see Figure 2) on the back surface 18b of the trigger button 18 is sandwiched between the rubber 22 and the side wall 20a. This allows the rubber 22 and trigger button 18 to be supported by the housing 20.

As shown in FIG. 4, a pair of terminals 40c are provided on the underside 40a of the main board 40. The main board 40 controls the imaging unit 16 and processes the information code captured by the imaging unit 16. The main board 40 lies within the housing 20. In other words, the main board 40 is disposed approximately parallel to the outer surface of the information reading device 10 on which the display unit 12 and operation buttons 14 are disposed (see FIG. 1). Note that the "underside" on the underside 40a merely refers to the bottom side in the drawing, and does not refer to the bottom side in the orientation of the information reading device 10. Please note that the term "underside" is used merely for convenience of explanation.

The pair of terminals 40c contact a pair of contacts 32c on the first plate 32a of the sub-board 32. This establishes electrical continuity between the main board 40 and the sub-board 32.

As described above, when the trigger button 18 is pressed, electrical continuity is established between the two patterns 32d, 32e on the second plate 32b of the sub-board 32. This establishes electrical continuity between the pair of terminals 40c on the main board 40 via the pair of contacts 32c on the first plate 32a of the sub-board 32. The main board 40 detects the continuity between the pair of terminals 40c and detects that the trigger button 18 has been pressed.

Figure 5 is an enlarged cross-sectional view of the pair of terminals 40c taken along a plane passing through the pair of terminals 40c, enlarging the area surrounding the pair of terminals 40c. As shown in Figure 5, the cross section of each terminal of the pair of terminals 40c is U-shaped. A predetermined elastic force is applied to the pair of terminals 40c, pressing the pair of terminals 40c against the first plate 32a of the sub-board 32. The predetermined elastic force maintains contact between the pair of terminals 40c and the pair of contacts 32c on the first plate 32a.

For example, the information reading device 10 is used in a variety of locations (e.g., warehouses, stores, outdoors). On-site workers may accidentally drop the information reading device 10. The frequency of tasks involving reading information codes using the information reading device 10 is relatively high. The frequency of dropping the information reading device 10 tends to increase in accordance with the frequency of the task.

As described above, the pair of terminals 40c on the main board 40 and the pair of contacts 32c on the sub-board 32 are maintained in contact by a predetermined elastic force. Therefore, when dropped, the pair of terminals 40c slide against the pair of contacts 32c. The more frequently the device is dropped, the more frequently the sliding occurs. As the sliding frequency increases, the pair of contacts 32c wears out quickly, causing the plating on the surface of the pair of contacts 32c to peel off. As the plating peels off, the base material of the pair of contacts 32c becomes exposed. As oxidation of the exposed base material progresses, poor conductivity between the pair of terminals 40c and the pair of contacts 32c may occur.

(Drop test explanation)
In order to check the resistance to multiple drops, a 1-meter random drop test was conducted on the information reading device 10. Below, first to third tests in which various parameters were changed will be explained. Note that the materials of each part are the same in the first to third tests. Specifically, the tests are as follows:

The first plate 32a of the sub-substrate 32 is constructed by laminating, in order from the pair of contacts 32c side, an Au-plated layer, a Ni-plated layer, a copper base material layer, an adhesive, and a polyimide base layer. The second plate 32b has a similar construction to the first plate 32a.

The double-sided tape 34 is made by laminating an acrylic adhesive, a polyolefin foam, and another acrylic adhesive.

The pair of terminals 40c is formed from a metal plate. The material of the metal plate is a copper alloy coated with a Ni base and an Au surface. The area of each terminal of the pair of terminals 40c that comes into contact with each of the pair of contacts 32c is approximately 0.42 square millimeters. The specified elastic force that maintains contact between the pair of terminals 40c and the pair of contacts 32c is 0.7 to 1.1 Newtons.

The material of block 36 is polycarbonate resin.

(First test)
In this test, the thickness of the Au-plated layer of the first plate 32a was set to 5.0 micrometers, the thickness of the Ni-plated layer of the first plate 32a was set to 0.03 micrometers, and the thickness of the double-sided tape 34 was set to 0.2 millimeters. The thickness of the first plate 32a in this test was approximately 0.11 millimeters. In this test, the base material of the first plate 32a was exposed after approximately 500 drops.

(Second Test)
The parameters of this test were the same as those of the first test, except that the thickness of the Au plating layer of the first plate 32a was set to 9.0 micrometers and the thickness of the Ni plating layer of the first plate 32a was set to 3.0 micrometers. The thickness of the first plate 32a in this test was also approximately 0.11 millimeters. In this test, the base material of the first plate 32a was exposed after approximately 1,000 drops. The drop strength in this test was twice that of the first test, and the improvement in strength is believed to be due to the increased thickness of the plating layer.

(Third Test)
The parameters of this test were the same as those of the second test, except that the thickness of the double-sided tape 34 was set to 0.1 mm. The thickness of the first plate 32a in this test was also approximately 0.11 mm. In this test, the base material of the first plate 32a was exposed after approximately 4,000 drops. The drop strength of this test was eight times that of the first test and four times that of the second test.

(Concept of sliding due to dropping; Figures 6 and 7)
FIG. 6 shows a conceptual diagram of each part when the double-sided tape 34 has a thickness of 0.2 mm, i.e., in the first and second tests. The double-sided tape 34 is compressed by a predetermined elastic force. As a result, the first plate 32a in contact with the double-sided tape 34 is depressed, and each terminal of the pair of terminals 40c bites into the first plate 32a. The amount of compression of the double-sided tape 34 is approximately 60 percent of the thickness of the double-sided tape 34. When the thickness of the double-sided tape 34 is 0.2 mm, the absolute value of the compression of the double-sided tape 34 by the predetermined elastic force is 0.2 × 0.6 = 0.12 mm. Accordingly, the amount of bite of each terminal of the pair of terminals 40c into the first plate 32a is approximately 0.12 mm.

Figure 7 shows a conceptual diagram of each part when the double-sided tape 34 is 0.1 millimeters thick, i.e., in the third test. When the double-sided tape 34 is 0.1 millimeters thick, the absolute value by which the double-sided tape 34 is compressed by a predetermined elastic force is 0.1 x 0.6 = 0.06 millimeters. Accordingly, the amount by which each terminal of the pair of terminals 40c bites into the first plate 32a is approximately 0.06 millimeters.

As shown in Figures 6 and 7, when the thickness of the double-sided tape 34 is 0.1 millimeters, the amount of penetration is a specific thickness, namely, 0.06 millimeters or less. In other words, as the thickness of the double-sided tape 34 decreases, the amount of penetration decreases, and the contact area of each terminal of the pair of terminals 40c with the first plate 32a decreases. As the contact area of each terminal decreases, the amount of plating worn off by one sliding stroke decreases. This is thought to be the reason why the drop resistance improved in the third test, where the double-sided tape 34 was thinner.

Based on the above test results and concepts, the inventors came up with the idea of reducing the thickness of the double-sided tape 34. Specifically, they came up with the idea of setting the thickness of the double-sided tape 34 to a predetermined thickness of "0.1 millimeters," which sets the amount of penetration of the pair of terminals 40c into the pair of contacts 32c to a specific amount (e.g., 0.06 millimeters) or less. Here, the predetermined thickness of "0.1 millimeters" is equal to or less than the thickness of the first plate 32a, "0.11 millimeters." This makes it possible to prevent accelerated wear of the pair of contacts 32c.

Note that the above drop test conditions are merely an example. A feature of the technology disclosed in this specification is that the thickness of the double-sided tape is set to a predetermined thickness that sets the amount of penetration of a pair of terminals into a pair of contacts to a specific amount or less. This feature makes it possible to prevent accelerated wear on the surface of the sub-board when the information reading device is dropped.

(Correspondence)
The information reading device 10, the housing 20, and the imaging unit 16 are examples of an "information reading device," a "housing," and a "reading unit," respectively. The combination of the trigger button 18 and the rubber 22 is an example of a "button." The sub-substrate 32, the first plate 32a, the second plate 32b, the pair of contacts 32c, the first pattern 32d, and the second pattern 32e are examples of a "sub-substrate," a "first plate," a "second plate," a "pair of contacts," a "first pattern," and a "second pattern," respectively. The double-sided tape 34 is an example of a "double-sided tape." The block 36 is an example of a "block." The main substrate 40 and the pair of terminals 40c are examples of a "main substrate" and a "pair of terminals," respectively.

(Second Example)
(Sub-board assembly 130; Figures 8 and 9)
The information reading device 10 of this embodiment is similar to that of the first embodiment, except for the configuration of the sub-board assembly 130. Figure 8 is an exploded view of the sub-board assembly 130 of this embodiment, and Figure 9 is a partial cross-sectional view taken along line IX-IX in Figure 8.

As shown in Figures 8 and 9, the sub-substrate assembly 130 includes, in addition to the sub-substrate 32 and block 36, adhesive 134a, reinforcing plate 134b, and double-sided tape 134c. The adhesive 134a is applied to the surface of the reinforcing plate 134b or the first plate 32a, and bonds the first plate 32a and reinforcing plate 134b. The double-sided tape 134c is a tape that bonds the reinforcing plate 134b to the base 36a of the block 36. The hardness of the reinforcing plate 134b is higher than that of the block 36. The "hardness" is measured, for example, by a test such as Vickers hardness. The material of the reinforcing plate 134b is resin. In a modified example, the material of the reinforcing plate 134b may be metal. The total thickness of the adhesive 134a and double-sided tape 134c is 0.1 mm or less. As shown in Figure 9, the second plate 32b is adhered to the base 36a with double-sided tape 134d.

For example, in the first embodiment, if the predetermined elastic force pressing the pair of terminals 40c against the first plate 32a of the sub-board 32 is increased, the pressure applied to the first plate 32a, double-sided tape 34, and block 36 increases. In this case, the high pressure may deform not only the first plate 32a and double-sided tape 34, but also the block 36. When the block 36 deforms, the double-sided tape 34 and first plate 32a are recessed along with the deformation of the block 36, causing each terminal of the pair of terminals 40c to bite into the first plate 32a.

In the configuration of this embodiment, a reinforcing plate 134b, which is harder than the block 36, is located between the first plate 32a and the block 36. The reinforcing plate 134b does not deform even under high pressure caused by a predetermined elastic force, preventing the first plate 32a from being dented. Even when the predetermined elastic force is high, the amount of engagement of the first plate 32a is kept below a specific amount, preventing accelerated wear of the pair of contact points 32c of the first plate 32a.

(Correspondence)
The adhesive 134a, the reinforcing plate 134b, and the double-sided tape 134c are examples of an "adhesive member," a "reinforcing plate," and a "double-sided tape," respectively. Note that in a modified example, the "adhesive member" may be a double-sided tape.

(Third Example)
(Sub-board assembly 230; Figures 10 and 11)
The information reading device 10 of this embodiment is similar to that of the first embodiment, except for the configuration of the sub-substrate assembly 230. Figure 10 is an exploded view of the sub-substrate assembly 230 of this embodiment, and Figure 11 is a partial cross-sectional view taken along line XI-XI in Figure 10.

As shown in Figures 10 and 11, the sub-board assembly 230 includes, in addition to the sub-board 32, double-sided tape 234a and a block 236. The double-sided tape 234a has a notch 234b formed in it.

The block 236 is similar to that of the first embodiment, except for the difference in the base structure. In this embodiment, the base 236a has a step 236b formed on the surface facing the first plate 32a. The step 236b is received in the notch 234b of the double-sided tape 234a. The height of the step 236b is equal to or less than the thickness of the double-sided tape 234a.

The notch 234b in the double-sided tape 234a and the step 236b in the block 236 are formed in the area where the pair of contacts 32c is located when viewed from the pair of contacts 32c on the first plate 32a. As a result, when viewed from the pair of contacts 32c, the portion of the double-sided tape 234a other than the notch 234b is located in an area different from the area where the pair of contacts 32c is located. Furthermore, the area of the first plate 32a where the pair of contacts 32c is located is in contact with the step 236b.

The first plate 32a is adhered to the block 236 by the double-sided tape 234a except for the notch 234b. As shown in Figure 11, the second plate 32b is adhered to the base 236a by the double-sided tape 234d.

As described above, the reason why the amount by which the terminal 40c bites into the first plate 32a increases is because the amount of compression of the double-sided tape increases. According to the configuration of this embodiment, even if the terminal 40c presses against the first plate 32a, the first plate 32a is in contact with the step 236b of the block 236 in the area where the pair of contacts 32c are located, so compression of the double-sided tape 234a arranged around the step 236b can be suppressed. By suppressing compression of the double-sided tape 234a, the amount by which the terminal 40c bites into the first plate 32a is also suppressed. This can suppress accelerated wear of the pair of contacts 32c on the first plate 32a.

Also, consider a comparative example in which the double-sided tape 234a is a simple rectangle and the step 236b extends to both widthwise edges 236e of the base 236a. That is, no notch 234b is formed in the double-sided tape 234a. In this modified example, the area where the first plate 32a is not adhered to the block 236 may be relatively large. If the area where the adhesion is not sufficient is large, there is a possibility that the first plate 32a may peel off from the block 236. According to the configuration of this embodiment, the notch 234b is formed and the double-sided tape 234a can be placed on both widthwise edges 234e of the step 236b. Compared to the comparative example, the area where the adhesion is not sufficient can be narrowed. Peeling of the first plate 32a from the block 236 can be prevented. Note that the configuration of the comparative example described above may also be adopted in the modified example.

(Correspondence)
The region where the step 236b exists and the region around the step 236b are examples of the "first region" and the "second region", respectively.

The above describes specific examples of the technology disclosed in this specification, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. For example, the following modifications may be adopted.

The rubber 22 may be omitted. For example, the trigger button 18 may return from a pressed state to its original state due to the restoring force of a spring. The spring does not have to face the second plate 32b. In this modified example, the trigger button 18 is an example of a "button."

The "reading unit" is not limited to the imaging unit 16, but may be, for example, a reader for reading information stored in an RFID tag, a reader for reading information stored in an NFC tag, etc.

The technical elements described in this specification or drawings may exhibit technical utility either alone or in various combinations, and are not limited to the combinations set forth in the claims at the time of filing. Furthermore, the technologies illustrated in this specification or drawings simultaneously achieve multiple objectives, and achieving any one of those objectives is itself technically useful.

10: Information reading device 12: Display unit 14: Operation button 16: Imaging unit 18: Trigger button 18a: Front surface 18b: Back surface 18c: Flange 20: Housing 20a: Side wall 20b: Hole 22: Rubber 22a: Front surface 22b: Back surface 22c: Conductive member 30: Sub-board assembly 32: Sub-board 32a: First plate 32b: Second plate 32c: Pair of contacts 32d: First pattern 32e: Second pattern 34: Double-sided tape 36: Block 40: Main board 40a: Bottom surface 40c: Pair of terminals 130: Sub-board assembly 134a: Adhesive 134b: Reinforcing plate 134c: Double-sided tape 134d: Double-sided tape 230: Sub-board assembly 234a: Double-sided tape 234b: Notch 234d : Double-sided tape 234e : Edge 236 : Block 236a : Base 236b : Step 236e : Edge

Claims (6)

The housing and
a reading unit for reading information;
a main board that is disposed within the housing and controls the reading unit;
a sub-board including a first plate facing the main board and a second plate facing a side wall of the housing;
a block that supports the sub-board within the housing;
a double-sided tape that bonds the first plate of the sub-board and the block;
a button for receiving an instruction to read information, the button having a back surface facing the second plate and a front surface exposed to the outside from the side wall;
Equipped with
a pair of contacts that contact a pair of terminals extending from the main board are formed on the first plate;
a first pattern extending from one of the pair of contacts and a second pattern extending from the other of the pair of contacts are formed on the second plate;
When the button is pressed and the back surface of the button comes into contact with the second plate, the first pattern and the second pattern are electrically connected;
The double-sided tape has a predetermined thickness that sets the amount of penetration of the pair of terminals into the pair of contacts to a specific amount or less. The information reading device of claim 1, wherein the predetermined thickness is equal to or less than the thickness of the first plate. An information reading device as described in claim 1 or 2, wherein the predetermined thickness is 0.1 millimeters or less. the first plate of the sub-substrate is adhered to the block by an adhesive structure including the double-sided tape,
The adhesive structure further includes an adhesive member and a reinforcing plate,
the adhesive member bonds the first plate and the reinforcing plate together,
the double-sided tape bonds the reinforcing plate and the block together;
The information reading device according to claim 1 , wherein the reinforcing plate has a hardness greater than that of the block. The information reading device described in claim 4, wherein the total thickness of the adhesive member and the double-sided tape is 0.1 millimeters or less. The housing and
a reading unit for reading information;
a main board that is disposed within the housing and controls the reading unit;
a sub-board including a first plate facing the main board and a second plate facing a side wall of the housing;
a block that supports the sub-board within the housing;
a double-sided tape that bonds the first plate of the sub-board and the block;
a button for receiving an instruction to read information, the button having a back surface facing the second plate and a front surface exposed to the outside from the side wall;
Equipped with
a pair of contacts that contact a pair of terminals extending from the main board are formed on the first plate;
a first pattern extending from one of the pair of contacts and a second pattern extending from the other of the pair of contacts are formed on the second plate;
When the button is pressed and the back surface of the button comes into contact with the second plate, the first pattern and the second pattern are electrically connected;
When viewed from the contact point, the double-sided tape is arranged in a second region different from a first region in which the contact point is arranged,
an information reading device, wherein the first plate and the block are in contact with each other in the first region;