JP5976283B2 - Optical information reader - Google Patents

Description

  The present invention relates to an optical information reading apparatus having an optical holder in which reading means capable of optically reading an information code is held.

  Conventionally, in an electronic apparatus such as an optical information reader, a board on which electronic components are mounted is generally accommodated in a state of being fixed to a housing using screws. However, when screws are used for assembling between parts or assembling to a housing, there is a problem that it is difficult to simplify the assembly process and reduce costs by reducing the number of parts.

  In view of this, the electronic device disclosed in Patent Document 1 below is configured as described below to achieve assembling with a reduced number of screws to be used. First, the power supply board and the I / O board are introduced into the rear case so that the respective circular holes penetrate the rear case side boss, and then the CPU board is further introduced into the rear case. Then, the front case is put on the rear case so that the front case side boss penetrates the circular hole of the CPU board. At this time, the front case side boss and the rear case side boss are in a butted state through a slight gap as a fastening allowance. In this state, by screwing the screw into the screw insertion hole of the rear case side boss, penetrating the rear case side boss, and further screwing into the front case side boss, both bosses are fastened, Assembly with the rear case is completed.

  In addition, the electronic device disclosed in Patent Document 2 below is configured as described below to achieve assembling with a reduced number of screws to be used. First, the printed circuit board is accommodated in the second half (lower case), and the mounting holes drilled in the four corners of the printed circuit board are fitted to the pin portions of the male stud formed in the second half. Let it be positioned. By covering the first half (upper case) from above the second half in this state, the outer peripheral walls of both halves are fitted together, and the top surface of the top wall of the first half is the second half. It is positioned so as to be flush with the upper end surface of the outer peripheral wall. At the same time, the engaging recesses and the engaging protrusions on both outer peripheral walls engage to lock the mutual positions of the halves, and the assembly of the case main body having the sealed space is completed.

JP 2008-171837 A Japanese Patent Laid-Open No. 06-021666

  However, in the case structure in which the number of screws to be used as disclosed in Patent Documents 1 and 2 is reduced, when applied to an optical information reading apparatus having a reading unit capable of optically reading an information code, Regarding the assembly of the optical holder holding the reading means to the substrate or the like, there is a problem in that it is difficult to keep high assembly accuracy because component displacement and disassembly are likely to occur. In this way, in the conventional housing structure, it is difficult to ensure high assembly accuracy without using screws, and it is necessary to use a small number of screws to ensure high assembly accuracy. After all, it is difficult to reduce the cost by simplifying the assembly process and reducing parts.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to use a screw for assembling an optical holder that holds reading means capable of optically reading an information code. It is an object of the present invention to provide an optical information reading apparatus that can suppress the positional displacement and disassembly of parts without fail and can keep high assembling accuracy.

In order to achieve the above object, in the optical information reading apparatus according to claim 1, the reading means (28, 21) capable of optically reading the information code and the reading means are held. An optical information reader (10) comprising an optical holder (60), a substrate (50) to which the optical holder is assembled, and a housing (11) in which the optical holder and the substrate are accommodated, The optical holder is formed with a plurality of engaging projections (62a, 62b, 63a, 63b) that are respectively inserted into a plurality of engaging holes (51 to 54) formed in the substrate when assembled to the substrate. Of the engaging protrusions, at least two (62a, 62b) are formed to be positionably engaged with the corresponding engaging holes, and at least one (63a, 63b) corresponds to the corresponding engaging hole. To fit an elastically closed state during and after insertion to the engagement hole, the outer diameter of the case where an external force a split pin shape formed by providing a slit in the cylinder does not act is the It is characterized by being formed to be slightly larger than the inner diameter of the engagement hole .
According to a second aspect of the present invention, in the optical information reading apparatus according to the first aspect, the optical holder is formed so that the four engagement protrusions are positioned at four corners of a rectangular region, and the four engagements Of the protrusions, two diagonally positioned are formed so as to be positionably engaged with the corresponding engaging holes, and the other two diagonally positioned are the corresponding engaging holes. In the case of a split pin shape formed by providing a slit in a cylinder so that it fits in an elastically closed state during and after insertion, the outer diameter when the external force does not act is the engagement hole It is formed so as to be slightly larger than the inner diameter .

According to a third aspect of the present invention, in the optical information reading device according to the first or second aspect , the optical holder is configured such that when each of the engagement protrusions is inserted into the corresponding engagement hole, the substrate of the substrate. An engagement piece (64) that is elastically engaged with the outer edge so as to draw the outer edge (50a) is formed.

A fourth aspect of the present invention is the optical information reading device according to any one of the first to third aspects, wherein the housing is provided with a holder-side guide provided in the optical holder when the optical holder is accommodated. (65a to 65d) are provided with case-side guides (14a to 14d), and the holder-side guide and the case-side guide are formed such that one guide holds the other guide when housed. Features.

According to a fifth aspect of the present invention, in the optical information reading device according to the fourth aspect of the present invention, the one guide is provided with a stopper that faces the end surface (66) of the other guide at the time of accommodation through a gap. 15) is formed.

A sixth aspect of the present invention is the optical information reader according to any one of the first to fifth aspects, wherein the casing is configured by assembling the one side case (11a) and the other side case (11b). The one side case and the other case are formed with engaging portions (16a, 16b) that engage with each other when the two cases are assembled.

A seventh aspect of the present invention is the optical information reading device according to any one of the first to sixth aspects, wherein the housing has the engagement hole (55 to 58) of any of the accommodated substrates. A housing-side engagement protrusion (18) that is inserted through the housing is formed.
In addition, the code | symbol in each said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

According to the first aspect of the present invention, in the optical holder that holds the reading means capable of optically reading the information code, the engagement protrusions that are respectively inserted into the plurality of engagement holes formed in the substrate when assembled to the substrate. Are formed, and at least two of the plurality of engaging protrusions are formed to be positionably engaged with the corresponding engaging holes, and at least one of the engaging protrusions is positioned with respect to the corresponding engaging holes. The outer diameter when the external force is not applied is the split pin shape formed by providing a slit in the cylinder so that it fits in an elastically closed state during and after insertion. Is formed to be slightly larger .

Accordingly, when the optical holder is assembled to the substrate, at least two engaging protrusions engage with the corresponding engaging holes so that the optical holder can be positioned, so that the optical holder can be easily placed in a predetermined position with respect to the substrate. Can be positioned. At the same time, at least one engagement projection, so fitted in the corresponding state of resiliently closed after medium insert and inserted into the engaging hole, the direction of relative along the substrate surface with respect to the substrate of the optical holder Movement (this is possible movement due to the engagement margin between the engagement protrusion and the engagement hole) is suppressed. At the same time, the elastically closed engagement protrusions increase the frictional force with the engagement holes of the substrate, so that the relative movement in the direction perpendicular to the substrate surface is slightly suppressed.
Therefore, regarding the assembly of the optical holder that holds the reading means capable of optically reading the information code, it is possible to suppress positional deviation without using a screw and to keep high assembly accuracy for the substrate. .

According to a third aspect of the present invention, the optical holder includes an engagement piece that elastically engages with the outer edge so as to draw the outer edge of the substrate when each engagement protrusion is inserted through the corresponding engagement hole. Is formed. For this reason, when the optical holder is assembled to the substrate, the engaging piece is elastically engaged with the outer edge so as to draw the outer edge of the substrate, so that the optical holder is orthogonal to the substrate surface with respect to the substrate. Relative movement in the direction is suppressed. Thereby, with respect to the assembly of the optical holder, it is possible to suppress positional deviation and disassembly without using screws, and to continue to ensure higher assembly accuracy for the substrate.

In the invention of claim 4 , the holder side guide of the optical holder and the case side guide of the housing are formed such that one guide sandwiches the other guide when housed. As a result, when the optical holder is accommodated in the housing, the other guide is sandwiched by the one guide, so that the positioning of the optical holder relative to the housing is facilitated by the guide function, and the optical The holder can be held with high assembling accuracy with respect to the housing.

According to the invention of claim 5 , a stopper is formed on one of the guides so as to face the end surface of the other guide at the time of accommodation through a gap. For this reason, even when the housing in which the optical holder is accommodated falls and the impact acts, the relative movement of both guides is restricted by the end surface of the other guide coming into contact with the stopper, and the optical holder is removed from the substrate. The movement to leave is suppressed. Thereby, the assembly holding function with respect to the board | substrate of the optical holder by both guides can be improved.

In the invention of claim 6 , since the engaging portion that engages with each other when the two cases are assembled is formed on the one side case and the other case constituting the casing, screws are used for assembling the optical holder. In addition to ensuring high assembly accuracy without the need for assembly, it is possible to ensure assembly accuracy without using screws for the assembly of both cases and to prevent the housing from being disassembled against impact.

According to the seventh aspect of the present invention, the housing is formed with a housing-side engagement protrusion that is inserted into any of the engagement holes of the accommodated substrate, so that the substrate can be easily positioned at a predetermined position with respect to the housing. can do.

It is sectional drawing which shows the structure outline | summary of the optical information reader which concerns on this embodiment. FIG. 2 is a block diagram schematically showing an electrical configuration of the optical information reading device in FIG. 1. It is explanatory drawing which shows the state which assembled | attached the optical holder to the board | substrate, FIG. 3 (A) is a side view, FIG.3 (B) is a rear view. 4A is an enlarged side view of the optical holder of FIG. 3A, and FIG. 4B is an enlarged rear view of the optical holder of FIG. 3B. FIG. 5 is an explanatory view showing the detailed shape of the optical holder 60, FIG. 5 (A) shows a rear view, FIG. 5 (B) shows a bottom view, and FIG. 5 (C) shows a side view. FIG. 6A is a perspective view showing a detailed shape of the split pin in FIG. 5, FIG. 6A shows a state where no external force is applied, and FIG. 6B shows a state where a radial external force is applied. FIG. 7A is an explanatory diagram for explaining the detailed shape of the upper case, and FIG. 7B is a cross-sectional view taken along the line 7B-7B shown in FIG. 7A. FIG. 8A is an explanatory view for explaining the detailed shape of the lower case, and FIG. 8B is a view of FIG. 8A viewed from the direction of the arrow 8B. It is sectional drawing which expands and shows the state which assembled | attached the optical holder to the housing | casing. It is explanatory drawing which shows the state which removed a part of upper side case from the optical information reader. It is explanatory drawing which shows the principal part of the optical information reader which concerns on the modification of this embodiment, FIG. 11 (A) is a perspective view which shows the split pin which has a cross-shaped slit, FIG.11 (B) is FIG. It is sectional drawing which shows the split pin which has a retaining function.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of an optical information reading device according to the invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of an optical information reading apparatus 10 according to the present embodiment. FIG. 2 is a block diagram schematically showing an electrical configuration of the optical information reading apparatus 10 of FIG.
The optical information reader 10 shown in FIG. 1 is portable information that optically reads an information code attached to an article, for example, a one-dimensional code such as a barcode or a two-dimensional code such as a QR code (registered trademark). It is configured as a terminal.

  The optical information reader 10 has an outer case formed by a gun-type housing 11 formed by assembling an upper case 11a and a lower case 11b formed of a synthetic resin material such as ABS resin. A cable 71 is provided that extends from the housing 11 to the outside and enables electrical connection with the host system. The casing 11 is formed with a reading port 12 that allows the reflected light from the information code to be incident by assembling both cases 11a and 11b. In the casing 11, an optical holder assembled to the substrate 50 is formed. 60 (described later) is disposed (accommodated) so as to face the reading port 12. The upper case 11a and the lower case 11b may correspond to examples of “one side case” and “other side case” recited in the claims.

  Further, there are a reading port chip 72 and a bottom piece 73 for alleviating the impact at the time of dropping on the periphery of the reading port 12 of the housing 11 and the periphery of the cable attachment portion 13 holding the cable 71 of the housing 11. Is assembled. The reading port chip 72 and the bottom piece 73 are formed of an annular elastic member not only for realizing a protective function but also for strengthening the assembly of the cases 11a and 11b.

Next, the electrical configuration of the optical information reader 10 will be described with reference to FIG.
As shown in FIG. 2, a circuit unit 20 is accommodated in the housing 11, and this circuit unit 20 mainly includes an optical system such as an illumination light source 21, a light receiving sensor 28, and an imaging lens 27. , A memory 35, a control circuit 40, a trigger switch 42, and other microcomputer (hereinafter referred to as “microcomputer”) systems.

  The optical system is divided into a light projecting optical system and a light receiving optical system. The illumination light source 21 constituting the light projecting optical system functions as an illumination light source capable of emitting the illumination light Lf, and includes, for example, a red LED and a lens provided on the emission side of the LED. FIG. 2 conceptually shows an example in which the illumination light Lf is irradiated toward the article R to which the information code C is attached.

  The light receiving optical system includes a light receiving sensor 28, an imaging lens 27, a reflecting mirror (not shown), and the like. The light receiving sensor 28 is configured to be able to receive the reflected light Lr irradiated and reflected by the information code C or the like. For example, a light receiving element which is a solid-state image pickup device such as a C-MOS or CCD is arranged in two dimensions. An area sensor corresponds to this.

  The imaging lens 27 functions as an imaging optical system capable of condensing incident light incident from the outside through the reading port 12 and forming an image on the light receiving surface 28a of the light receiving sensor 28. In the present embodiment, after the illumination light Lf emitted from the illumination light source 21 is reflected by the information code C, the reflected light Lr is condensed by the imaging lens 27, and a code image is formed on the light receiving surface 28 a of the light receiving sensor 28. The image is formed.

  The microcomputer system includes an amplification circuit 31, an A / D conversion circuit 33, a memory 35, an address generation circuit 36, a synchronization signal generation circuit 38, a control circuit 40, a trigger switch 42, a light emitting unit 43, a buzzer 44, a vibrator 45, and a communication interface 48. Etc.

  The image signal (analog signal) output from the light receiving sensor 28 of the optical system is amplified by a predetermined gain by being input to the amplifier circuit 31, and then input from the analog signal when input to the A / D conversion circuit 33. Converted into a digital signal. When the digitized image signal, that is, image data (image information) is generated and input to the memory 35, it is stored in a predetermined code image information storage area. The synchronization signal generation circuit 38 is configured to generate a synchronization signal for the light receiving sensor 28 and the address generation circuit 36, and the address generation circuit 36 is based on the synchronization signal supplied from the synchronization signal generation circuit 38. Thus, the storage address of the image data stored in the memory 35 can be generated.

  The memory 35 is a semiconductor memory device, and corresponds to, for example, a RAM (DRAM, SRAM, etc.) or a ROM (EPROM, EEPROM, etc.). In addition to the above-described code image information storage area, the RAM of the memory 35 is configured to be able to secure a work area and a reading condition table used by the control circuit 40 in each processing such as arithmetic operation and logical operation. Yes. The ROM stores in advance a predetermined program that can execute reading processing, analysis processing, and the like, and a system program that can control each hardware such as the illumination light source 21 and the light receiving sensor 23.

  The control circuit 40 is configured by a microcomputer capable of controlling the entire optical information reading apparatus 10, has a CPU, a system bus, an input / output interface, and the like, and has an information processing function. Is configured. In the present embodiment, a trigger switch 42, a light emitting unit 43, a buzzer 44, a vibrator 45, a communication interface 48, and the like are connected to the control circuit 40.

  As a result, the control circuit 40 can, for example, turn on / off the light-emitting unit 43 that functions as an indicator for notifying information related to monitoring and management of the trigger switch 42 and reading of the information code C, and a buzzer that can generate a beep sound and an alarm sound. The communication interface 48 enables on / off of the ring 44, drive control of the vibrator 45 capable of generating vibration that can be transmitted to the user of the optical information reader 10, and serial communication with an external device via the cable 71. Communication control is possible.

  Each component constituting the optical system such as the illumination light source 21 and the light receiving sensor 28 is held in the optical holder 60, and a part of each component constituting the microcomputer system such as the control circuit 40 and the memory 35 is It is mounted on the substrate 50. The optical holder 60 is assembled to the substrate 50 as will be described later, so that the illumination light source 21, the light receiving sensor 28, etc., and the control circuit 40, etc. are electrically connected in a controllable manner. Each component constituting the optical system such as the illumination light source 21 and the light receiving sensor 28 may correspond to an example of a “reading unit” recited in the claims.

  Next, a characteristic configuration of the optical information reading apparatus 10 according to the present embodiment will be described with reference to FIGS. FIG. 3 is an explanatory view showing a state in which the optical holder 60 is assembled to the substrate 50, FIG. 3 (A) is a side view, and FIG. 3 (B) is a rear view. 4A is an enlarged side view of the optical holder 60 in FIG. 3A, and FIG. 4B is an enlarged rear view of the optical holder 60 in FIG. 3B. FIG. 5 is an explanatory view showing the detailed shape of the optical holder 60, FIG. 5 (A) shows a rear view, FIG. 5 (B) shows a bottom view, and FIG. 5 (C) shows a side view. 6 is a perspective view showing the detailed shape of the split pin of FIG. 5, FIG. 6 (A) shows a state where no external force is applied, and FIG. 6 (B) shows a state where a radial external force is applied. Show. FIG. 7A is an explanatory diagram for explaining the detailed shape of the upper case 11a, and FIG. 7B is a cross-sectional view taken along the line 7B-7B shown in FIG. 7A. . FIG. 8A is an explanatory view for explaining the detailed shape of the lower case 11b, and FIG. 8B is a view of FIG. 8A viewed from the direction of the arrow 8B.

First, the shape of the substrate 50 will be described.
As shown in FIGS. 3 (A) and 3 (B), the substrate 50 is formed so that the holder side portion to which the optical holder 60 is assembled is widened, and there are 4 near the outer edge 50a of the holder side portion. Two holder engagement holes 51 to 54 are provided at the four corners of the rectangular region. Of the four holder engagement holes 51 to 54, two holder engagement holes 51 and 53 positioned diagonally have two holder engagement holes 52 and 52 whose inner diameters are positioned at other diagonals. It is formed to be smaller than the inner diameter of 54. Further, four housing engagement holes 55 to 58 are provided in the cable side portion of the substrate 50 so as to be positioned at the four corners of the rectangular region.

Next, the shape of the optical holder 60 will be described.
The holder main body 61 that forms the outline of the optical holder 60 is formed in a box shape so that one of the holder main bodies 61 is opened, and the illumination light source 21 and the light receiving sensor 28 are read into the holder main body 61 through the openings. It is arranged at a predetermined place so as to function as a means. As shown in FIGS. 4 and 5, on the bottom wall 61 a of the holder main body 61, four engagement protrusions respectively inserted into the four holder engagement holes 51 to 54 of the substrate 50 are located at the four corners of the rectangular region. It is provided as follows.

  Of these four engagement protrusions, two diagonal engagement protrusions (hereinafter referred to as engagement pins 62a and 62b) engage with the holder engagement holes 51 and 53 of the substrate 50 so as to be positioned. Each is formed in a substantially cylindrical shape. That is, the outer diameters of both the engagement pins 62a and 62b are formed to be slightly smaller than the inner diameters of the holder engagement holes 51 and 53.

Of the four engaging protrusions described above, two engaging protrusions (hereinafter referred to as split pins 63 a and 63 b) located at other diagonal positions are inserted into the holder engaging holes 52 and 54 of the substrate 50. It is formed to fit in a state of elastically closed during and after insertion entrance. Specifically, as shown in FIG. 6 (A), the split pins 63a and 63b are formed such that a slit is provided in a cylinder. As shown in FIG. 6B, the split pins 63a and 63b are elastically deformed so that the outer diameter is reduced by narrowing the slit width when the radial external force is applied, and when the external force is not applied. The outer diameter is formed to be slightly larger than the inner diameter of the holder engagement holes 52 and 54, respectively.

  On both side walls 61b and 61c of the holder main body 61, a snap fit 64 extends along the side walls 61b and 61c as engaging pieces that elastically engage with the outer edge 50a so as to attract the outer edge 50a of the substrate 50. Each is provided so that it can be served. Both snap fits 64 are formed in a substantially U shape so as to be elastically deformed in the thickness direction, and a claw portion for engaging with the outer edge 50a is provided inside the tip end portion.

  The upper wall 61d and the lower wall 61e of the holder body 61 extend in the optical axis direction of the optical holder 60 (the horizontal direction in the drawing in FIG. 5C) as shown in FIGS. Two upper wall side ribs 65a and 65b and two lower wall side ribs 65c and 65d are provided. The upper wall side ribs 65a and 65b and the lower wall side ribs 65c and 65d may correspond to an example of a “holder side guide” described in the claims.

Next, the shapes of the upper case 11a and the lower case 11b constituting the housing 11 will be described.
As shown in FIGS. 7A and 7B, both upper walls formed on the upper wall 61 d when the optical holder 60 is housed in the housing 11 are formed on the inner wall surface of the upper case 11 a near the reading port 12. Two grooves 14a and 14b for guiding the side ribs 65a and 65b are provided. Both the groove portions 14a and 14b are formed so as to guide the upper wall side ribs 65a and 65b when the holder main body 61 is assembled to the upper case 11a, and to sandwich the upper wall side ribs 65a and 65b, respectively, when accommodated. Yes.

  Further, as shown in FIGS. 8A and 8B, the inner wall surface of the lower case 11 b near the reading port 12 is formed on the lower wall 61 e when the optical holder 60 is accommodated in the housing 11. Two groove portions 14c and 14d for guiding the lower wall side ribs 65c and 65d are provided. Both the groove portions 14c and 14d are formed so as to guide the lower wall side ribs 65c and 65d when the holder main body 61 is assembled to the lower case 11b, and to sandwich the lower wall side ribs 65c and 65d, respectively. ing.

  In particular, stoppers 15 are formed in the grooves 14c and 14d so as to face the end surfaces on the reading port side of the lower wall side ribs 65c and 65d (hereinafter referred to as the reading port side end surface 66) at the time of accommodation through a gap. ing. Each of the grooves 14a to 14d corresponds to an example of a “housing side guide” recited in the claims, and the reading port side end surface 66 is an example of the “end surface of the other guide” recited in the claims. Can correspond to

  The upper case 11a and the lower case 11b are formed with engaging portions that engage with each other when the cases 11a and 11b are assembled. Specifically, as shown in FIGS. 7A and 7B, in the upper case 11a, the snap fit 16a as the engagement portion extends in the longitudinal direction toward the lower case. And two cable side portions. Each snap fit 16a is formed so as to be elastically deformable in the thickness direction, and a rectangular opening is provided at the tip thereof. As shown in FIG. 8A, the lower case 11b has a total of four convex portions 16b that can be engaged with the openings of the snap fits 16a as the engaging portions.

  Further, the upper case 11a is provided with a pedestal 17 having a cross-shaped cross section at a position facing the housing engagement holes 55 to 58 of the accommodated substrate 50, and each pedestal 17 has an end surface within the case 11 inside. The height of the substrate 50 is so high as to come into contact with the substrate surface of the substrate 50 accommodated therein. On the end face of each pedestal 17, housing side engaging projections 18 are formed to be inserted into the corresponding housing engaging holes 55 to 58 so as to be positioned.

Next, assembly of the optical holder 60, the substrate 50, and the housing 11 configured as described above will be described below. FIG. 9 is an enlarged cross-sectional view showing a state in which the optical holder 60 is assembled to the housing 11. FIG. 10 is an explanatory view showing a state in which a part of the upper case 11a is removed from the optical information reading device 10. As shown in FIG.
First, as shown in FIGS. 3A and 3B, the optical holder 60 holding the light receiving sensor 28 and the like is assembled to the substrate 50. Thereby, the illumination light source 21, the light receiving sensor 28, and the like are electrically connected to the control circuit 40 and the like in a controllable manner. At this time, as shown in FIGS. 4A and 4B, the engagement pins 62a and 62b of the optical holder 60 are inserted into and engaged with the holder engagement holes 51 and 53 of the substrate 50, respectively. The pins 63a and 63b are inserted into and fitted in the holder engagement holes 52 and 54 in an elastically closed state, and both snap fits 64 are elastic with respect to the outer edge 50a of the substrate 50 at the claw portions. Engage with. The optical holder 60 is assembled to the substrate 50 so that its optical axis forms a predetermined inclination angle θ with respect to the substrate surface of the substrate 50 (see FIG. 3A).

  Next, the optical holder 60 assembled to the substrate 50 is assembled to the lower case 11b so that the lower wall side ribs 65c and 65d are guided by the grooves 14c and 14d. At this time, both the lower wall side ribs 65c and 65d are sandwiched between the groove portions 14c and 14d so that the reading port side end surface 66 faces the stopper 15 provided in the both groove portions 14c and 14d through a predetermined gap. (See FIG. 9).

  Subsequently, the upper case 11a is assembled to the lower case 11b to which the substrate 50 and the optical holder 60 are assembled. At this time, the upper case 11a is guided in a state in which the upper wall side ribs 65a and 65b of the optical holder 60 are sandwiched by the grooves 14a and 14b (see FIG. 9), and each case side engagement protrusion 18 corresponds to the corresponding case. The upper case 11a and the substrate 50 are positioned by being inserted into the body engagement holes 55 to 58.

The upper case 11a and the lower case 11b are assembled by the snap fits 16a of the upper case 11a engaging the corresponding protrusions 16b of the lower case 11b in the state of being positioned as described above. (See FIG. 10). And both cases 11a and 11b are firmly assembled by assembling the reading port chip 72 and the bottom piece 73 with respect to the reading port 12 and the cable mounting part 13 constituted by assembling both cases 11a and 11b. .
Thereby, the assembly of the optical information reader 10 shown in FIG. 1 is completed without using a screw.

As described above, in the optical information reading apparatus 10 according to this embodiment, the optical holder 60 that holds the reading means such as the illumination light source 21 and the light receiving sensor 28 that can optically read the information code is provided on the substrate. Engagement pins 62a and 62b and split pins 63a and 63b that are inserted into the respective holder engagement holes 51 to 54 formed in the substrate 50 when assembled to the substrate 50 are formed. The engagement pins 62a and 62b are associated with each other. The split pins 63a and 63b are elastically inserted into and after insertion into the holder engagement holes 52 and 54, respectively. It is formed to fit in a closed state.

Thus, when the optical holder 60 is assembled to the substrate 50, the engaging pins 62a and 62b engage with the corresponding holder engaging holes 51 and 53 so that the optical holder 60 can be positioned. Can be easily positioned at a predetermined position. At the same time, split pins 63a, 63b are so fitted in a state of resiliently closed after medium insert and inserted into the corresponding holder for engagement hole 52 and 54, the substrate relative to the substrate 50 of the optical holder 60 Relative movement in the direction along the surface (movement that can occur due to a fitting margin between the engagement pins 62a and 62b and the holder engagement holes 51 and 53) is suppressed. At the same time, the elastically closed split pins 63a and 63b increase the frictional force with the holder engagement holes 52 and 54, so that the relative movement in the direction perpendicular to the substrate surface is slightly suppressed.
Therefore, regarding the assembly of the optical holder 60 that holds the reading means capable of optically reading the information code, the positional deviation is suppressed without using a screw, and high assembling accuracy for the substrate 50 is continuously maintained. Can do.

  Further, when the engaging pins 62a and 62b and the split pins 63a and 63b are inserted into the corresponding holder engaging holes 51 to 54, respectively, the outer edge 50a of the substrate 50 is drawn into the optical holder 60 so as to draw the outer edge 50a. A snap fit 64 is formed that is elastically engaged with the. For this reason, when the optical holder 60 is assembled to the substrate 50, the snap fit 64 is further elastically engaged with the outer edge 50a so as to attract the outer edge 50a of the substrate 50. The relative movement in the direction perpendicular to the substrate surface with respect to 50 is suppressed. Thereby, with respect to the assembly of the optical holder 60, it is possible to suppress misalignment / disassembly without using a screw, and to keep higher assembly accuracy for the substrate 50.

  Instead of the snap fit 64, an engagement piece that elastically engages with the outer edge 50a so as to attract the outer edge 50a of the substrate 50 may be employed.

  Furthermore, the ribs 65a to 65d of the optical holder 60 and the groove portions 14a to 14d of the housing 11 are formed such that the groove portions 14a to 14d sandwich the ribs 65a to 65d when housed. Accordingly, when the optical holder 60 is accommodated in the housing 11, the ribs 65a to 65d are sandwiched by the groove portions 14a to 14d, so that the positioning of the optical holder 60 with respect to the housing 11 is only facilitated by the guide function. Instead, the optical holder 60 after being accommodated can be continuously held with high assembling accuracy with respect to the housing 11.

  In particular, the stoppers 15 are formed in the grooves 14c and 14d provided in the lower case 11b so as to face the reading port side end surfaces 66 of the lower wall side ribs 65c and 65d when accommodated through a gap. For this reason, even when the casing 11 in which the optical holder 60 is housed falls and receives an impact, the reading port side end surface 66 abuts against the stopper 15 so that the lower wall side ribs 65c and 65d and the groove portion 14c, The relative movement with respect to 14d is restricted, and the movement of the optical holder 60 away from the substrate 50 is suppressed. Thereby, the assembly | attachment holding | maintenance function with respect to the board | substrate 50 of the optical holder 60 by the lower wall side ribs 65c and 65d and the groove parts 14c and 14d can be improved. The stopper 15 is not limited to being formed in the grooves 14c and 14d provided in the lower case 11b, and may be provided in at least one of the grooves 14a to 14d.

  In the optical holder 60, a groove portion formed like the groove portions 14a to 14d is adopted instead of the ribs 65a to 65d, and a rib formed like the ribs 65a to 65d instead of the groove portions 14a to 14d in the housing 11 is adopted. May be adopted. Further, instead of the ribs 65a to 65d and the groove portions 14a to 14d, a relatively guideable holder side guide and housing side guide may be adopted, and one guide may be formed so as to sandwich the other guide during housing. Good.

  Further, the upper case 11a and the lower case 11b constituting the housing 11 are respectively formed with a snap fit 16a and a convex portion 16b that are engaged with each other when the cases 11a and 11b are assembled. In addition to ensuring high assembly accuracy without using screws, the assembly of both cases 11a and 11b ensures high assembly accuracy without using screws and the housing disassembles against impact. This can be suppressed.

  Instead of the snap fit 16a and the convex portion 16b, an engaging portion that engages with each other when the cases 11a and 11b are assembled may be employed.

  Further, since the housing 11 is formed with housing-side engagement protrusions 18 that pass through the housing engagement holes 55 to 58 of the accommodated substrate 50, the substrate 50 is placed at a predetermined position with respect to the housing 11. It can be easily positioned.

FIG. 11 is an explanatory view showing a main part of the optical information reading apparatus 10 according to a modification of the present embodiment, and FIG. 11 (A) is a perspective view showing a split pin 63c having a cross-shaped slit, FIG. 11B is a cross-sectional view showing a split pin 63d having a retaining function.
As a modification of the present embodiment, in the optical holder 60, the split pins 63 a and 63 b are not limited to being formed as a cylinder provided with slits, but with respect to the holder engagement holes 52 and 54 of the substrate 50. may be formed as an engaging projection to be fitted in a state of resiliently closed after medium insertion and insertion. Specifically, as shown in FIG. 11A, a split pin 63c formed as if a circular slit was provided in a cylinder may be employed. Further, as shown in FIG. 11B, a split pin 63d formed so that the tip end portion of each split pin has a larger diameter than the root portion may be employed as a retaining prevention.

In addition, the number of engagement protrusions formed in this way is not limited to two, and may be one or three or more. In this case, the holder for the engagement hole of the substrate 50, corresponding to the aforementioned engaging projections are formed to fit in a state of resiliently closed after medium insert and insert.

In addition, this invention is not limited to the said embodiment and modification, You may actualize as follows.
(1) The present invention is not limited to the use of screws in all the assemblies, but only by assembling the main parts, for example, the optical holder 60 and the substrate 50, by adopting the characteristic configuration of the present invention. High assembly accuracy may be secured without using screws.

(2) In the present embodiment, the upper case 11a is assembled after the optical holder 60 assembled to the substrate 50 is assembled to the lower case 11b. However, the present invention is not limited to this, and the optical holder 60 assembled to the substrate 50 is used as the upper case. After assembling to 11a, lower case 11b may be assembled.

DESCRIPTION OF SYMBOLS 10 ... Optical information reader 11 ... Housing 11a ... Upper case (one side case)
11b ... Lower case (other side case)
14a-14d ... Groove (housing side guide)
15 ... Stopper 16a ... Snap fit (engagement part)
16b ... convex part (engagement part)
18 ... Housing side engaging protrusion 50 ... Substrate 50a ... Outer edge 51-54 ... Holder engaging hole (engaging hole)
55-58 ... Engagement hole for housing (engagement hole)
60 ... Optical holder 61 ... Holder body 62a, 62b ... Engaging pin (engaging protrusion)
63a, 63b ... split pins (engagement protrusions)
64 ... snap fit (engagement piece)
65a, 65b ... upper wall side rib (holder side guide)
65c, 65d ... lower wall side rib (holder side guide)
66: Reading port side end face (end face)

Claims (7)

Reading means capable of optically reading the information code;
An optical holder for holding the reading means;
A substrate on which the optical holder is assembled;
A housing for housing the optical holder and the substrate;
An optical information reader comprising:
The optical holder is formed with a plurality of engaging projections that are respectively inserted into a plurality of engaging holes formed in the substrate when assembled to the substrate.
At least two of the plurality of engagement protrusions are formed to be positionably engaged with the corresponding engagement holes, and at least one is being inserted into the corresponding engagement holes. In addition, the outer diameter when the external force is not applied is slightly smaller than the inner diameter of the engagement hole. An optical information reading device formed to be large . The optical holder is formed so that the four engagement protrusions are located at the four corners of the rectangular region,
Of the four engagement protrusions, two diagonally positioned are formed to be positionably engaged with the corresponding engagement holes, and the other two diagonally positioned are corresponding The outer diameter in the case of a split pin shape formed by providing a slit in a cylinder so that the engaging hole fits in an elastically closed state during and after insertion into the engagement hole, and no external force is applied. The optical information reading device according to claim 1, wherein the optical information reading device is formed to be slightly larger than an inner diameter of the engagement hole .   The optical holder is formed with an engagement piece that elastically engages with the outer edge so as to draw the outer edge of the substrate when each of the engagement protrusions is inserted into the corresponding engagement hole. The optical information reading apparatus according to claim 1, wherein the optical information reading apparatus is an optical information reading apparatus. The housing is provided with a housing-side guide that guides a holder-side guide provided in the optical holder when the optical holder is accommodated.
The optical information reading according to claim 1, wherein the holder-side guide and the housing-side guide are formed such that one guide sandwiches the other guide when housed. apparatus.   The optical information reading apparatus according to claim 4, wherein the one guide is formed with a stopper facing the end surface of the other guide at the time of accommodation through a gap. The housing is configured by assembling one side case and the other side case,
The optical information according to any one of claims 1 to 5, wherein the one-side case and the other-side case are formed with engaging portions that engage with each other when the two cases are assembled. Reader.   The optical housing according to any one of claims 1 to 6, wherein a housing-side engagement protrusion is formed on the housing to be inserted into the engagement hole of any of the accommodated substrates. Information reader.

Images