JP2008257672A - Optical information reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information reader, capable of attaining both the thinning of a protective plate and improvement in maintenance properties. <P>SOLUTION: A bar-code reader 1 comprises a light receiving optical system for receiving reflected light from optical information, a case 3 having a reading port 5, a fixing member 60 disposed between the reading port 5 and the receiving optical system, and the protective plate 70 fixed to the reading port 5 side of the fixing member 60. The protective plate 70 is adapted to transmit the reflected light in a fixed state, and to release the fixation to the fixing member 60 by distortion to be removable from the fixing member 60. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical information reader.

2. Description of the Related Art Conventionally, in the field of optical information reading devices, a configuration provided with a protective plate that prevents foreign matter from entering the inside of the device has been provided. For example, in the barcode reader disclosed in Patent Document 1, a dustproof cover integrally formed with a cylindrical lens is provided in the vicinity of the opening (reading port) of the case to prevent foreign matter from entering the apparatus.
Japanese Utility Model Publication No. 5-17760

  By the way, in the case of a configuration in which a protective plate is provided in the vicinity of the reading port as in Patent Document 1, although maintenance related to the protective plate is easy to perform, the protective plate is arranged to be easily subjected to external impacts and the like. The surface is required to have hardness in order to require high strength and prevent the protective plate from being damaged. Therefore, the protective plate is inevitably configured to be thick, and an optical loss is likely to occur.

  On the other hand, when considering a configuration in which the protective plate is provided on the far side away from the reading port, it is difficult to apply an external impact or the like, and thus it is easy to suppress the mechanical strength of the protective plate. Therefore, the protective plate can be made thin so that optical loss is less likely to occur. However, such an arrangement on the back side causes a problem that maintenance such as attachment / detachment and cleaning is difficult to perform.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical information reader capable of realizing both a reduction in thickness of the protective plate and an improvement in maintainability.

In order to achieve the above object, the invention of claim 1 is an optical information reading apparatus having a light receiving optical system for receiving reflected light from optical information, the case having a reading opening, and the reading opening; A fixing member disposed between the light receiving optical system and a fixing member fixed to the reading port side of the fixing member and configured to transmit the reflected light in the fixed state, and the fixing member by bending deformation And a protective plate that can be detached from the fixing member after being fixed to the fixing member.
In the present invention, “reading port side” means “position facing the reading port”, and is included in the concept of “reading port side” if the fixed position of the protective plate is the position facing the reading port. The
Further, the “configuration in which the fixing to the fixing member is released by the bending deformation” in the present invention means a configuration in which some bending deformation is required when releasing the fixation of the protective plate from the fixing member. "A configuration in which the fixation is released by releasing the engagement between the protection plate and the fixing member due to deformation" or "a configuration in which the fixation is released by moving the protection plate relative to the fixing member while being flexibly deformed" Etc.

  The invention of claim 2 is an optical information reading device having a light receiving optical system for receiving reflected light from optical information, and a case provided with a reading port, and between the reading port and the light receiving optical system. A fixing member disposed on the fixing member, a protective plate fixed to the fixing member, configured to transmit the reflected light in the fixed state, and removable from the fixing member. A hole for inserting and removing the protective plate is formed in a peripheral portion of the protective plate, and an opening / closing member for opening and closing the hole is provided, and the protective plate is connected to the case through the hole. It is possible to attach and detach inside, and the end portion is supported by the opening and closing member when fixed.

  According to a third aspect of the present invention, in the optical information reading apparatus according to the first aspect, a hole for inserting and removing the protective plate is formed in a peripheral portion of the protective plate in the case, and the hole is opened and closed. An opening / closing member is provided, and the protection plate is detachable from the case through the hole, and an end portion is supported by the opening / closing member when fixed.

  According to a fourth aspect of the present invention, in the optical information reading device according to the second or third aspect, the opening / closing member is made of a soft member softer than the case.

  According to a fifth aspect of the present invention, in the optical information reading device according to any one of the second to fourth aspects, the hole portions are respectively formed in a pair of opposing walls constituting a part of the case. Each opening is opened and closed by the two opening / closing members. When the protection plate is fixed, both ends of the protection plate are supported by both opening / closing members. A guide groove is provided for guiding the tip of the protective plate toward the opening / closing member attached to the other during the attachment operation to be inserted and attached from one of the two holes. And

  According to a sixth aspect of the present invention, in the optical information reading device according to any one of the second to fifth aspects, the opening / closing member sandwiches an end of the protective plate when the protective plate is fixed. It is provided with.

  According to a seventh aspect of the present invention, in the optical information reading device according to any one of the second to sixth aspects, the open / close member is formed in an open / close main body for opening / closing the hole and the case. A flexible connecting portion that engages with the engaging hole and connects the case and the opening / closing main body is provided.

  The invention according to claim 8 is the optical information reading apparatus according to claim 1, wherein the protective plate includes a plurality of inserted portions each having a hole or a notch, and the vicinity of opposing end portions of the protective plate facing each other. A plurality of projections that are respectively fitted to the plurality of inserted portions, and the tool engagement portion. A tool relief hole for releasing the tool inserted into the insertion portion, and a protrusion is formed on the inner edge of the inserted portion, and the protruding portion is formed between the convex portion and the inserted portion. The projection is elastically deformed according to the fitting, and the convex portion is pressed and held by a restoring force corresponding to the elastic deformation.

  According to a ninth aspect of the present invention, in the optical information reading device according to the eighth aspect, the tool engaging portion is formed in the vicinity of both end portions in the longitudinal direction of the protective plate.

  According to a tenth aspect of the present invention, in the optical information reading device according to the ninth aspect, the insertion portion is formed of a long hole extending in a longitudinal direction of the protective plate, and the convex portion is formed in accordance with a bending deformation of the protective plate. Can move relatively in the slot.

  An eleventh aspect of the present invention is the optical information reading device according to any one of the eighth to tenth aspects, wherein the fixing member holds a pair of opposed end portions of the protective plate. The holding groove is configured such that the groove width is gradually narrowed toward the bottom in the depth direction, and in the fixed state where the protective plate is fixed to the fixing member, the opposing end is the It is characterized by being sandwiched between the inner walls of the holding grooves.

  A twelfth aspect of the present invention is the optical information reader according to any one of the eighth to tenth aspects, wherein the fixing member holds a pair of opposed end portions of the protective plate. A groove is provided, and the opposing end portion branches into a first end portion whose tip is accommodated in the holding groove and a second end portion whose tip is accommodated in the holding groove in an elastically deformed state. The protection plate expands the tip of the first end and the tip of the second end in the groove width direction of the holding groove by a restoring force according to elastic deformation of the second end. And the fixing member holds the pair of opposing end portions by the pair of holding grooves in a state where the protective plate is elastically curved. To do.

  According to a thirteenth aspect of the present invention, in the optical information reading device according to any one of the first to twelfth aspects, the fixing member includes a condensing lens for condensing the illumination light. And the protective plate is attached to the lens member at a position that does not overlap the condensing lens.

  In the first aspect of the present invention, the fixing member is disposed between the reading port and the light receiving optical system, and the protective plate is fixed to the reading port side of the fixing member. Compared with, it is difficult for external impact to be applied to the protective plate. Therefore, it is easy to suppress the mechanical strength of the protective plate, and it is easy to reduce optical loss. In addition, the protection plate is configured so that it can be removed from the fixed member by being bent and deformed. Therefore, the protective plate can be attached and detached without performing complicated operations. Excellent in properties.

  In the invention of claim 2, since a fixing member is arranged between the reading port and the light receiving optical system, and a protective plate is fixed to the fixing member, compared with a case where a protective plate is arranged in the reading port. It is difficult for external shock to be applied to the protective plate. Further, a hole for inserting and removing the protective plate is formed in the case, and the protective plate can be attached to and detached from the case through the hole. Accordingly, it is possible to further facilitate the attachment / detachment of the protection plate while adopting a configuration in which the protection plate is disposed at a position recessed from the reading port to protect against the impact. In addition, since the opening / closing member that opens and closes the hole is also used as a member that supports the end of the protection plate, the protection plate can be stably held without increasing the number of parts.

  According to the third aspect of the present invention, a hole for inserting and removing the protective plate is formed in the case, and the protective plate can be attached to and detached from the case through the hole. Accordingly, it is possible to further facilitate the attachment / detachment of the protection plate while adopting a configuration in which the protection plate is disposed at a position recessed from the reading port to protect against the impact. In addition, since the opening / closing member that opens and closes the hole is also used as a member that supports the end of the protection plate, the protection plate can be stably held without increasing the number of parts.

  In the invention of claim 4, since the opening / closing member is made of a soft member softer than the case, when an impact is generated near the opening / closing member in the case of dropping or the like, this can be effectively absorbed, and as a result, component protection is achieved. Effectively.

  In the invention of claim 5, holes are respectively formed in the pair of opposing walls provided in the case, and each hole is opened and closed by two opening and closing members. Therefore, the attachment / detachment operation can be performed from any hole, and the attachment / detachment operation can be further facilitated. Further, when the protection plate is fixed, both ends of the protection plate are supported by the both opening and closing members, so that the holding of the protection plate is further stabilized. Furthermore, a guide groove is provided for guiding the front end of the protective plate toward the opening / closing member attached to the other during the mounting operation in which the protective plate is inserted and attached from one of the two holes. Therefore, the protective plate inserted from the hole can be smoothly guided to an appropriate position, which can contribute to improvement and speeding up of the mounting operation.

  In the invention of claim 6, since the opening / closing member is provided with a holding portion for holding the end portion of the protection plate when the protection plate is fixed, the displacement in the thickness direction of the protection plate can be restrained. Deviation can be effectively prevented.

  According to the invention of claim 7, in the opening / closing member, an opening / closing body part for opening / closing the hole part and a flexible connecting part for engaging the engagement hole formed in the case to connect the case and the opening / closing body part Since the opening / closing member can be engaged with the case when the hole is opened, loss of the opening / closing member can be effectively prevented.

  According to the invention of claim 8, the projection is elastically deformed according to the fitting between the convex and the inserted portion, and the convex is pressed and held by the restoring force according to the elastic deformation. A stable fixed state can be secured with a simple configuration. In addition, when removing the protective plate, the tool can be easily bent by simply engaging the tool with the tool engaging portion formed at the opposing end of the protective plate and operating the opposing end in the proximity direction. Can do.

  According to the ninth aspect of the present invention, since the tool engaging portions are formed in the vicinity of both ends in the longitudinal direction of the protective plate, the protective plate is more easily bent according to the operation applied to the tool engaging portion.

  In the invention of claim 10, the inserted portion is formed of a long hole extending in the longitudinal direction of the protective plate, and the convex portion can be relatively moved in the long hole in accordance with the bending deformation of the protective plate. . Accordingly, since the deformation is less likely to be hindered by the convex portion, the protective plate can be more easily bent at the time of removal.

  In the invention of claim 11, in the fixed state in which the protective plate is fixed to the fixing member, the opposing end is sandwiched between the inner walls of the holding grooves, so that the protective plate is not easily displaced in the thickness direction, and rattling is suppressed. Can stably hold the protective plate.

  In the invention of claim 12, the pair of opposing end portions of the protective plate are branched into the first end portion and the second end portion, and the first end is caused by the restoring force according to the elastic deformation of the second end portion. The urging force that expands the tip of the part and the tip of the second end in the groove width direction of the holding groove is generated. Accordingly, the protective plate is not easily displaced in the thickness direction, and the protective plate can be stably held while suppressing backlash and the like. Furthermore, since the fixing member is configured to hold the pair of opposed end portions by the pair of holding grooves in a state in which the protection plate is elastically curved, the elastic return force of the protection plate also prevents rattling. This contributes to synergistic stabilization of the fixed state.

  In the invention of claim 13, since the lens member is also used as a fixing member, it is not necessary to provide a special part, and the number of parts can be reduced. In addition, the protective plate is attached to the lens member at a position that does not overlap the condensing lens, and optical loss can be effectively suppressed for the reflected light that requires accuracy while also serving as the lens member.

[First embodiment]
A first embodiment in which an optical information reading device of the present invention is applied to a barcode reader will be described below with reference to the drawings. First, a configuration outline of the barcode reader 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view schematically illustrating an essential part of a barcode reader 1 according to a first embodiment of an optical information reading apparatus of the present invention. FIG. 2 is a block diagram schematically showing the electrical configuration of the barcode reader 1.

  The barcode reader 1 is configured by housing a circuit unit 20 inside a case 3, and the case 3 has a reading port 5 for conducting illumination light and reflected light described later. For example, the case 3 is generally formed in a substantially longitudinal shape. In the example of FIG. 1, the reading port 5 is provided so as to open at one end in the longitudinal direction. Further, the case 3 has a form in which the tip 3 a side where the reading port 5 is formed is bent with respect to the circuit housing 3 b side where the printed wiring board 25 is housed.

  As shown in FIG. 2, the 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, and a microcomputer such as a memory 35, a control circuit 40, and a trigger switch 50. And is mounted on the printed wiring board 25 described above or mounted on the case 3.

  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. For example, as shown in FIG. 1, a red LED 22 and a lens 23 provided on the emission side of the LED 22 are provided. It consists of and. In this embodiment, the illumination light Lf can be irradiated toward the reading object R through the reading port 5 of the case 3. Note that a barcode B as an example of optical information is affixed to the reading object R.

  The light receiving optical system includes a light receiving sensor 28, an imaging lens 27, and a reflecting mirror 7 (FIG. 1). The light receiving sensor 28 is configured to be able to receive the reflected light Lr irradiated and reflected on the reading object R and the barcode B. The light receiving sensor 28 is mounted on the printed wiring board 25 so as to be able to receive incident light incident through the imaging lens 27.

  The imaging lens 27 functions as an imaging optical system capable of condensing incident light incident from the outside via the reading port 5 and forming an image on the light receiving surface 28a of the light receiving sensor 28. In the present embodiment, the illumination light Lf emitted from the illumination light source 21 is reflected by the barcode B and then reflected by the reflecting mirror 7. The reflected light Lr is collected by the imaging lens 27 to form a code image on the light receiving surface 28a of the light receiving sensor 28.

  Next, a configuration outline of the microcomputer system will be described. 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 50, a buzzer 44, a communication interface 48, and the like.

  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 input to the memory 35, it is stored in a predetermined code image 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 control circuit 40 is a microcomputer that can control the entire barcode reader 10 and includes a CPU, a system bus, an input / output interface, and the like. The control circuit 40 can constitute an information processing apparatus together with the memory 35 and has an information processing function. The control circuit 40 is configured to be connectable to various input / output devices (peripheral devices) via a built-in input / output interface. In the case of this embodiment, the trigger switch 50, the buzzer 44, the communication interface 48, etc. Connected. Thereby, for example, monitoring and management of the trigger switch 50, on / off of the sound of the buzzer 44 capable of generating a beep sound and an alarm sound, communication control of the communication interface 48 with the code content of the read barcode B to an external device, etc. Is possible.

  The trigger switch 50 is a switch configured to be capable of external operation (for example, pressing operation), and gives a signal corresponding to the external operation to the control circuit 40. In the barcode reader 10 according to the present embodiment, reading of the barcode is started with the operation of the trigger switch 50 as a trigger.

Next, the protection plate 70 and the fixing member 60 that fixes the protection plate 70 will be described. FIG. 3 is a view illustrating the protective plate attached to the fixing member, and is a cross-sectional view showing a cross section AA of FIG. 4. FIG. 4 is a view of the fixing member and the protective plate attached to the fixing member as viewed from the reading port side. FIG. 5 is a view of the protective plate as viewed from the reading port side. FIG. 6A is an enlarged view showing a part of the protective plate in an enlarged manner, and FIG. 6B is an enlarged view showing a part of the configuration in which the protective plate is fixed to the fixing member. is there. Further, FIG. 7 is an enlarged view showing a part of FIG. 3 in an enlarged manner, and FIG. 8 is an explanatory view for explaining the operation of attaching and detaching the protection plate. FIG. 9 is a view for explaining the operation of attaching the protection plate, and is a cross-sectional view showing a state in which the protection plate is removed from the configuration of the BB cross section of FIG.
The bar code reader 1 according to the present embodiment has a light receiving optical system that receives reflected light from optical information (bar code B) as described above, and includes a reading port 5 and a light receiving optical system of the case 3. A fixing member 60 shown in FIG. The fixing member 60 is made of, for example, a resin material, has transparency as a whole, and is disposed in the vicinity of the boundary between the tip 3a and the circuit housing 3b in the case 3.

  The fixing member 60 is fixed to the case 3 so as to be fitted to the inner wall of the case 3, and, as shown in FIGS. Has the function to hold. That is, it plays a role of holding the protective plate 70 at a predetermined position inside the case 3. Various methods can be adopted as a method of attaching the fixing member 60 to the case 3. For example, the fixing member 60 may be fixed to the case 3 by a fastening member such as a screw. You may make it hold | maintain by a part of 3 (for example, nail-like part etc.).

  As shown in FIG. 5, the protective plate 70 fixed to the fixing member 60 is configured in a plate shape and a rectangular shape by a resin material having transparency, for example. In addition to being fixed to the reading port 5 side, the light reflected from the reading port 5 is transmitted in the fixed state.

  Further, in the present embodiment, as shown in FIG. 4, a fixing member 60 configured as a substantially rectangular shape as a whole is employed, and the protection plate 70 is accommodated in a frame-shaped accommodation portion 65 formed inside. The protective plate 70 is held in a state where it is in contact. The accommodating portion 65 surrounds the entire periphery of the protection plate 70 and restricts the movement of the protection plate 70 in the longitudinal direction and the movement in the short direction. A light guide hole 66 that allows reflected light to pass is formed on the rear side of the housing portion 65, and the light guide hole 66 is configured to be blocked by the protection plate 70 in a fixed state of the protection plate 70. ing.

  As shown in FIG. 4, the protection plate 70 is formed with four inserted portions 73a, 73b, 73c, 73d made of elongated holes, and these four inserted portions 73a, 73b, 73c, 73d are The four protrusions 67a, 67b, 67c and 67d formed on the fixing member 60 are respectively fitted. As shown in FIG. 5, among the four inserted portions 73a, 73b, 73c, and 73d, the inserted portions 73a and 73c are formed in the vicinity of the first long side of the protective plate 70, and the inserted portion 73b. , 73d are formed in the vicinity of the second long side opposite to the first long side. The inserted portions 73a and 73b are respectively formed at positions closer to the first short side of the protective plate 70, and the inserted portions 73c and 73d are respectively positioned at positions closer to the second short side. Is formed. Since it is formed in this way, each of the four inserted parts 73a, 73b, 73c, 73d is positioned in a state of approaching the corner part of the protective plate 70, and is balanced in the fitted state shown in FIG. It will be held well and stably.

  As shown in FIGS. 5 and 6A, projections 74a, 74b, 74c, and 74d are formed on the inner edge portions of the inserted portions 73a, 73b, 73c, and 73d, respectively. The protrusions 74a, 74b, 74c, and 74d are configured to protrude toward the opening region side of the inserted portions 73a, 73b, 73c, and 73d, and as shown in FIG. 6B, the protrusions 67a, 67b, and 67c. , 67d and the inserted portions 73a, 73b, 73c, 73d are elastically deformed in accordance with the fitting, and the convex portions 67a, 67b, 67c, 67d are pressed and held by a restoring force corresponding to the elastic deformation. ing. More specifically, in the inserted portions 73a, 73b, 73c, and 73d, the width W1 (see FIG. 6A) of the portion where the protrusions 74a, 74b, 74c, and 74d in the natural state are formed is 67a and 67b. 67c, 67d is smaller than the width W2 (see FIG. 6B), and the convex portions 67a, 67b, 67c, 67d are inserted into the inserted portions 73a, 73b, 73c, 73d, respectively. The protrusions 74a, 74b, 74c, and 74d are pushed away and elastically deformed to press the protrusions 67a, 67b, 67c, and 67d.

  As shown in FIGS. 3 and 4, the fixing member 60 has a pair of holding grooves 63, each holding a pair of opposed end portions (specifically, both longitudinal end portions 75, 76) of the protective plate 70. 64 is provided. The pair of holding grooves 63 and 64 are formed to face each other at a deep position of the accommodating portion 65, and in the short direction of the fixing member 60 (when the lens 23 side is downward and the opposite side is upward) (Vertical direction). As shown in FIGS. 3 and 4, in the fixed state in which the protective plate 70 is fixed to the fixing member 60, both longitudinal end portions 75 and 76 of the protective plate 70 are fitted in the holding grooves 63 and 64, respectively. In addition to the fitting of the projections 67a, 67b, 67c, and 67d with the projections 67a, 73b, 73c, and 73d, the fixed state is maintained. Further, as shown in FIG. 7, the holding grooves 63 and 64 (the holding groove 63 side is shown in FIG. 7) are configured such that the groove width gradually becomes narrower toward the bottom in the depth direction, and the protective plate 70 is fixed. In a fixed state in which the member 60 is fixed, both longitudinal end portions 75 and 76 are sandwiched between inner walls of the holding grooves. For example, as shown in FIG. 7, in the fixed state where the protective plate 70 is fixed to the fixing member 60, the longitudinal end 75 is sandwiched between the inner walls 63 a and 63 b of the holding groove 63. In the present embodiment, the protective plate 70 is slightly bent in the fixed state, and a force is generated so that the end portion 75 is directed toward the bottom side of the holding groove 63 by the elastic return force.

  Further, as shown in FIGS. 4 and 5, tool engaging portions 71, which are holes, are provided in the vicinity of the opposing end portions (in the present embodiment, both longitudinal end portions 75, 76 in the present embodiment) of the protective plate 70. 72 is formed. The tool engaging portions 71 and 72 engage a tweezers P (see FIG. 8: described later) or a tool that can be operated in the same manner as the tweezers P, and are fixed with the protective plate 70 of the fixing member 60 fixed. In the state, it is arranged to be exposed to the outside in the vicinity of both end portions of the accommodating portion 65.

  On the other hand, as shown in FIGS. 3, 4, 6, and 7, in the fixing member 60, the tool engaging portion is positioned on the far side of the tool engaging portion 75.76 in the fixed state of the protective plate 70. Tool escape holes 61 and 62 for releasing the tools inserted into 75 and 76 are formed. The tool relief holes 61 and 62 are formed so as to open to the arrangement side of the protective plate 70 and communicate with the fixed tool engaging portions 75 and 76, respectively. The size is larger than 76.

  The protective plate 70 that can be fixed to the fixing member 60 by such a configuration is released from the fixing member 60 by being fixed to the fixing member 60 by bending deformation. Specifically, in the fixed state shown in FIGS. 3 and 4, the tool is inserted into the tool engaging portions 76, 76, and both the tool engaging portions 75, 76 are displaced so as to be moved inward. For example, when the tool engaging portions 75 and 76 are sandwiched by tweezers-like tools P as shown in FIG. 8 and these tool engaging portions 75 and 76 are displaced in the directions of arrows F1 and F2 shown in FIGS. The central portion of the protective plate 70 is bent so as to protrude to the front side (reading port 5 side: see FIG. 1). As a result, both end portions 75 and 76 can be removed from the holding grooves 63 and 64, and the inserted portions 73a, 73b, 73c, and 73d are displaced from the convex portions 67a, 67b, 67c, and 67d by the displacement of the center portion. Displacement is relatively disengaged. Since the inserted portions 73a, 73b, 73c, and 73d are each formed by a long hole that extends in the longitudinal direction of the protective plate 70, the convex portions 67a, 67b, 67c, and 67d correspond to the bending deformation of the protective plate 70, respectively. It can move relatively in the long hole.

  When the fitting is released, the protective plate 70 can be taken out through the reading port 5 as shown in FIG. If a slight groove is provided at the tip of the tool P as indicated by the lower right arrow portion in FIG. 8, the tool P and the protective plate 70 can be easily engaged when the tool P is operated. Is easier to do.

  Moreover, what is necessary is just to perform operation reverse to removal at the time of attachment. That is, after the tool P is engaged with the tool engaging portions 71 and 72 as shown in FIG. 8, the tool engaging portions 71 and 72 are displaced in the directions of arrows F1 and F2 to bend the protective plate 70, In this state, the protective plate 70 is pushed into the accommodating portion 65 as shown in FIG. Since the inserted portions 73a, 73b, 73c, 73d are each formed by a long hole extending in the longitudinal direction of the protective plate 70, even if the tool engaging portions 71, 72 are displaced and slightly bent, the convex portions 67a, 67b, It can be easily aligned with 67c and 67d. Further, when the protection plate 70 is pushed into the housing 65 to release the bending, the protection plate 70 is elastically restored and both end portions 75 and 76 are accommodated in the holding grooves 63 and 64 as shown in FIG. Become.

  As shown in FIG. 1, the fixing member 60 of the present embodiment is configured as a lens member in which a lens 23 for condensing illumination light (the lens 23 corresponds to an example of a condensing lens) is formed in part. Has been. The protective plate 70 is attached to the fixing member 60 at a position that does not overlap the lens 23. In other words, in the fixed state, the lens 23 is not disposed on one side or the other side in the thickness direction of the protective plate 70. Note that the thickness of the protective plate 70 is smaller than the thickness of the lens 23 and smaller than the thickness of the portion other than the lens 23 in the fixing member 60.

  In the barcode reader 1 configured as described above, as shown in FIG. 1, the illumination light projected from the LED 22 is emitted from the reading port 5 through the lens 23, and is read by the barcode B (FIG. 2). Reflected. The reflected light passes through the protective plate 70, passes through the light guide hole 66 formed in the fixing member 60, is reflected by the reflecting mirror 7, and is received by the light receiving sensor 28.

  As described above, according to the present embodiment, the fixing member 60 is disposed between the reading port 5 and the light receiving optical system, and the protective plate 70 is fixed to the reading port 5 side of the fixing member 60. As compared with the case where the protective plate 70 is disposed in the reading port 5, it is difficult for the external shock to be applied to the protective plate 70. Therefore, it is easy to suppress the mechanical strength of the protective plate 70 and to reduce the optical loss. Further, since the protection plate 70 is configured to be released from the fixing member 60 by being fixed to the fixing member 60 by bending deformation, the protection plate 70 can be removed without performing a complicated operation. Detachable and easy to maintain.

  In addition, the protrusions 74a, 74b, 74c, and 74d are elastically deformed according to the fitting between the protrusions 67a, 67b, 67c, and 67d and the inserted portions 73a, 73b, 73c, and 73d, and the recovery is performed according to the elastic deformation. Since the projections 67a, 67b, 67c, and 67d are pressed and held by force, a stable fixed state can be secured with a simple configuration. When removing, the tool is engaged with the tool engaging portions 71 and 72 formed at the opposing ends 75 and 76 of the protective plate 70, and the opposing ends 75 and 76 are even operated in the proximity direction. In this case, the protective plate 70 can be easily bent.

  Furthermore, since the tool engaging portions 71 and 72 are formed in the vicinity of both ends in the longitudinal direction of the protective plate 70, the protective plate 70 is more easily bent in response to an operation applied to the tool engaging portions 71 and 72. .

  The inserted portions 73a, 73b, 73c, and 73d are long holes extending in the longitudinal direction of the protective plate 70, and the convex portions 67a, 67b, 67c, and 67d are disposed in the long holes according to the deformation of the protective plate 70. It has a structure that can move relatively. Accordingly, since the deformation is less likely to be hindered by the convex portion, the protective plate 70 can be more easily bent at the time of removal.

  Further, in the fixed state in which the protective plate 70 is fixed to the fixing member 60, the opposing end portions 75 and 76 are sandwiched between the inner walls of the holding grooves. Thus, the protective plate 70 can be stably held.

  Further, since the lens member is also used as the fixing member 60, it is not necessary to provide a special part, and the number of parts can be reduced. Further, the protective plate 70 is attached to the lens member at a position that does not overlap the condensing lens, and optical loss can be effectively suppressed for reflected light that requires accuracy while also using the lens member.

[Second Embodiment]
Next, a second embodiment will be described.
FIG. 10 is a view of the protective plate 170 used in the barcode reader according to the second embodiment as viewed from the reading port side, and FIG. 11A is an enlarged view of a part of the protective plate 170. is there. FIG. 11B is a view of the protective plate 170 viewed from the lens 23 side. In the present embodiment, only the protective plate 170 and the fixing member 160 are different from the first embodiment, and other than that is the same as the first embodiment. Therefore, components other than the protective plate 170 and the fixing member 160 will be described with reference to FIGS.

  The bar code reader according to the present embodiment also has a light receiving optical system that receives reflected light from optical information (the same light receiving optical system as that in the first embodiment). It is the structure accommodated in the case 3 provided. A fixing member 160 (see FIG. 12) slightly different from the fixing member 60 is disposed between the reading port 5 and the light receiving optical system, and the protective plate 70 and the fixing member 60 are provided on the reading port 5 side. A slightly different protective plate 170 (see FIGS. 10 and 12) is fixed. Hereinafter, the protection plate 170 and the fixing member 160 will be described mainly.

  Similarly to the first embodiment, the protective plate 170 is configured to transmit the reflected light in a fixed state fixed to the fixing member 160, and is fixed to the fixing member 160 by bending deformation and is released from the fixing member 160. Can be removed. In addition, since the tool engaging parts 71 and 72 in the protection plate 170 are the same arrangement | positioning and structure as 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. Further, the inserted portions 173a, 173b, 173c, and 173d are arranged in the same manner as the inserted portions 73a, 73b, 73c, and 73d in the first embodiment, and the same convex portions 67a and 67b as in the first embodiment. , 67c and 67d, except that the protrusions 74a, 74b, 74c and 74d are not provided as in the first embodiment.

  As shown in FIGS. 12 and 13, the fixing member 160 of the present embodiment includes a pair of holding grooves 163 and 164 that respectively hold a pair of opposed end portions (longitudinal ends 175 and 176) of the protective plate 170. ing. As shown in FIGS. 10 and 11, one end 175 in the longitudinal direction has a first end 177a whose tip is accommodated in a holding groove 163 (see FIGS. 12 and 13) and an elastic end as shown in FIG. In the deformed state, the tip branches to second end portions 177b and 177c accommodated in the holding groove 163. The end portion 175 of the protection plate 170 opens larger than the width of the holding groove 163 in the natural state as shown in FIG. 11B, and the first end portion 177a and the second end portion 177a are in the natural state as shown in FIG. In a state where both the end portions 177b and 177c are fitted in the holding groove 163, an elastic restoring force is generated to return to the state as shown in FIG. The same applies to the other end portion 176 in the longitudinal direction. As shown in FIG. 10, the tip end is held in the holding groove 164 (see FIG. 12), and the tip end is held in the elastically deformed state. When the first end 178a and the second end portions 178b and 178c are both fitted in the holding groove 164, the natural state (FIG. 11 (b An elastic return force is generated to return to the same state as in FIG. By such a restoring force according to the elastic deformation of the second ends 177b and 177c, the tip of the first end 177a and the tips of the second ends 177b and 177c are expanded in the groove width direction of the holding groove 163. Similarly, the biasing force is generated, and similarly, the restoring force corresponding to the elastic deformation of the second end portions 178b and 178c causes the tip end of the first end portion 178a and the tip end of the second end portions 178b and 178c to be the groove width of the holding groove 164. A biasing force that expands in the direction is generated.

  Furthermore, as shown in FIGS. 12 and 13, the fixing member 160 has a pair of opposing ends (longitudinal ends 175, 164) by a pair of holding grooves 163 and 164 in a state where the protective plate 170 is elastically curved. 176). That is, in a state where the fixing member 160 holds the protective plate 170, the protective plate 170 is elastically deformed, and an elastic return force is generated to return the bending.

  As shown in FIGS. 12 and 13, a part of the fixing member 160 of the present embodiment has the same configuration as that of the fixing member 60 of the first embodiment, and a tool relief hole 61 having the same configuration, 62, the light guide hole 66, the lens 23, and the convex portions 67a, 67b, 67c, 67d (only some of the convex portions are shown in FIGS. 12 and 13) are denoted by the same reference numerals. In the present embodiment, a plurality of protrusions 67a, 67b, 67c, and 67d are fitted into a plurality of inserted portions 173a, 173b, 173c, and 173d formed on the protection plate 170, respectively. Furthermore, tool escape holes 61 and 62 for releasing the tools inserted into the tool engaging portions 71 and 72 are provided. In addition, the fixing member 160 of the present embodiment is also a lens member in which the lens 23 that collects the illumination light is partially formed, and the protective plate 170 is attached to the fixing member 160 at a position that does not overlap the lens 23. It has become.

  In the configuration of the present embodiment, a pair of opposed end portions (end portions 175 and 176) of the protective plate 170 are branched into a first end portion and a second end portion, and according to elastic deformation of the second end portion. Due to the returning force, a biasing force is generated to expand the tip of the first end and the tip of the second end in the groove width direction of the holding groove. Therefore, the protective plate 170 is not easily displaced in the thickness direction with respect to the fixing member 160, and the protective plate 170 can be stably held while suppressing rattling and the like. Further, the fixing member 160 is configured to hold the pair of opposed end portions (end portions 175, 176) by the pair of holding grooves 163, 164 in a state where the protective plate 170 is elastically curved. The elastic return force that the protective plate 170 attempts to return from the curvature also contributes to the prevention of rattling and the like, and it is possible to synergistically stabilize the fixed state.

[Third embodiment]
Next, a third embodiment of the present invention will be described. FIG. 15 is a side view schematically illustrating the appearance of a barcode reader 300 according to the third embodiment of the present invention. FIG. 16 is an explanatory diagram for explaining a state in which the opening / closing member is removed, and FIG. 17 is an explanatory diagram for schematically explaining the internal configuration of the barcode reader 300. FIG. 18 is a sectional view schematically showing the vicinity of the position AA in FIG. FIG. 19 is a cross-sectional view partially and schematically showing the vicinity of the position BB in FIG. FIG. 20 is a cross-sectional view schematically showing the vicinity of the CC position in FIG. FIG. 21 is a cross-sectional view partially showing a sandwiching configuration of the protective plate by the opening / closing member, and is a cross-sectional view schematically showing the vicinity of the DD position in FIG. 20. The circuit unit of the barcode reader 300 of this embodiment uses the same circuit unit 20 (FIG. 2) as that of the first embodiment, and will be described with reference to FIG. 2 as appropriate.

  As shown in FIG. 15, the barcode reader 300 is configured such that the circuit unit 20 (FIG. 2) is accommodated in the case 303 as in the first embodiment. The case 303 has a reading port 305 for conducting illumination light and reflected light. The case 303 is generally formed in a substantially longitudinal shape, and the reading port 305 is provided so as to open at one end side in the longitudinal direction. Yes. In the example of FIG. 15, the case 303 is configured by combining the first case portion 303 a and the second case portion 303 b. As shown in FIGS. 15 and 17, the case 303 is configured such that the tip portion 301 side where the reading port 305 is formed is bent with respect to the circuit housing portion 302 side where the printed wiring board 25 is housed. .

  The circuit unit 20 is the same as that shown in FIG. 2, and mainly includes an optical system such as an illumination light source 21, a light receiving sensor 28, and an imaging lens 27, and a microcomputer (hereinafter referred to as “trigger switch 50”). These are mounted on a printed wiring board 25 (see FIG. 17) or mounted on a case 303. Since the reflecting mirror 7, the LED 22, and the lens 23 are the same as those in the first embodiment, the same reference numerals as those in FIG. Note that the specific configuration of the circuit unit 20 is as described above with reference to FIG.

Next, the protection plate 370 and the fixing member 360 that fixes the protection plate 370 will be described.
As shown in FIG. 17, in the barcode reader 300, a light receiving optical system is configured by the light receiving sensor 28, the imaging lens 27 (FIG. 2), and the reflecting mirror 7 similar to those in the first embodiment. A fixing member 360 shown in FIGS. 18 and 19 is disposed between the light receiving optical system and the reading port 305, and a protective plate 370 is detachably attached to the fixing member 360.

  As shown in FIGS. 18 and 19, the fixing member 360 includes a first fixing portion 361 that supports an upper end portion 371 (first long side portion) of the protective plate 370 and a lower end portion 372 (first long side portion). The second fixed portion 362 that supports the second long side portion on the opposite side of the protective plate 370, and a pair of plate surface support portions 313 and 314 that support the plate surface 373 on the reading port 305 side of the protection plate 370. The first fixing portion 361 is configured integrally with the case 303 or is a portion to which the case 303 is fixed as a separate member from the case 303, and a holding surface 361 a that holds the upper end 371 of the protection plate 370. A protrusion 361b that restricts the displacement of the protective plate 370 toward the reading port 305 is formed, and a taper surface 361c that follows the holding surface 361a is formed in a portion of the protrusion 361b on the protective plate 370 side. ing.

  The second fixing portion 362 is made of a member including the lens 23 in a part thereof. A holding surface 362 a for holding the lower end portion 372 of the protection plate 370 and a reading of the protection plate 370 are formed on the upper portion of the second fixing portion 362. A protrusion 362b that restricts the displacement to the opposite side of the mouth 305 is formed. As shown in FIG. 18, the protrusion 362 b has one end in the width direction (the hole 307 side) in the case 303 in the longitudinal direction of the protection plate 370 (hereinafter, the longitudinal direction of the protection plate 370 is also referred to as the width direction). To the other end side (hole portion 308 side) and constitutes a part of a guide groove 380 described later.

  The plate surface support portions 313 and 314 are respectively provided at both ends in the width direction (more specifically, both sides of the lens 23) in the case 303, and support the plate surface 373 on the reading port 305 side of the protective plate 370. Yes. Further, FIG. 19 shows a guide groove 380 constituted by the plate surface support portion 314 and the projection portion 362b, and the same guide groove is also formed by the plate surface support portion 313 and the projection portion 362 (not shown). ). The guide groove 380 determines a moving direction when the protective plate 370 is attached / detached. When the mounting operation is performed, the leading end of the protective plate 370 inserted from one of the holes 307 and 308 is used. The protective plate 370 is guided to a proper mounting position by guiding it toward the opening / closing member attached to the other side, or the attached protective plate 370 is moved outside through one of the holes 307 and 308. Function to guide you to.

  The protective plate 370 is configured to be longitudinally and elastically deformable by a transparent resin material or the like. This protective plate 370 is fixed to the reading port 305 side of the fixing member 360 (position facing the reading port 305) and transmits reflected light in the fixed state. The protection plate 370 of the present embodiment is fixed to the fixing member 360 when the barcode reader 300 is used. On the other hand, when the bar code reader 300 is removed, the fixing to the fixing member 360 is released due to bending deformation, and can be detached from the fixing member 360. It is comprised so that.

  Specifically, when the protection plate 370 is fixed, the protection plate 370 is held in a curved state to some extent from a natural state (a state where the plate surface 373 is flat), and elastic recovery corresponding to the bending is performed. The protective plate 370 is pressed against any member in the case by force, and wobbling is prevented. Various configurations for such bending can be considered. For example, the protection plate 370 may be slightly curved by sandwiching the protection plate 370 with the opening and closing members 310 and 311 described later, and the protrusion 362b is a slightly curved rib. The protective plate 370 may be bent at the time of fixation by configuring the shape.

  In the present embodiment, the holes 307 and 308 for inserting and removing the protective plate 370 into and from the periphery of the protective plate 370 in the case 303 (specifically, a pair of opposing walls 303c and 303d constituting a part of the case 303). Are formed respectively. These holes 307 and 308 are respectively provided on both sides of the protection plate 370 in the width direction (that is, the longitudinal direction of the protection plate 370). When the opening and closing members 310 and 311 described later are removed, these holes 307 and 308 are provided. The protective plate 370 is configured to be visible through the portions 307 and 308.

  The opening and closing members 310 and 311 open and close the holes 307 and 308, respectively, and are made of a soft member that is softer than the case 303. In the present embodiment, the opening and closing members 310 and 311 are made of, for example, elastically deformable rubber members, and are configured to be in a substantially natural state when mounted as shown in FIGS. On the other hand, the opening and closing members 310 and 311 can be attached and detached by elastically deforming them so that the holes 307 and 308 can be taken in and out. For example, when the opening and closing members 310 and 311 are removed from the mounted state of FIGS. 18 and 20, the case housing portions 310b and 311b of the opening and closing members 310 and 311 are deformed to the extent that the holes 307 and 308 can pass (for example, By forcibly deforming the opening and closing members 310 and 311 by pulling, the opening and closing members 310 and 311 can be easily detached.

  As shown in FIGS. 20 and 21, the protective plate 370 is configured such that the end portions are supported by the opening and closing members 310 and 311 when fixed. Specifically, the opening / closing members 310 and 311 are provided with sandwiching portions 310a and 311a that sandwich the end portions of the protection plate 370, respectively, and the protection plate 370 is sandwiched in the thickness direction by the sandwiching portions 310a and 311a. Thus, the end of the protective plate 370 is positioned. Further, the protective plate 370 is sandwiched in the plate surface direction (that is, the direction in which the both sandwiching portions 310a and 311a approach each other) by the both sandwiching portions 310a and 311a. The sandwiching portions 310a and 311a are each configured as a hole that fits into an end portion of the protection plate 370, and the inner walls of the sandwiching portions 310a and 311a sandwich the protection plate 370 in the thickness direction, and each sandwiching portion 311a and 311a The bottom portions 310c and 311c of the 311b are positioned so as to contact the end portions of the protection plate 370. In this way, when the protective plate 370 is sandwiched between the clamping portions 310a and 311a, the protective plate 370 can be prevented from wobbling. As described above, when the protection plate 370 is sandwiched in the thickness direction by the sandwiching portions 310a and 311a, the protection plate 370 may be fixed to the fixing member 360 without being bent. However, wobbling can be suppressed and the protective plate can be stably held.

  Further, in the present embodiment, as shown in FIGS. 18 and 20, at the time of fixing the protective plate 370, at least a part of each end of the protective plate 370 is located in each hole 307, 308, When the opening and closing members 310 and 311 are removed, the removal-side end portion of the protection plate 370 is exposed to the outside at a position where the work is easy (that is, a position in the hole).

  As described above, according to the configuration of the present embodiment, the holes 307 and 308 for taking in and out the protective plate 370 are formed in the case 303, and the protective plate 370 is inserted into the case 303 through the holes 307 and 308. It is designed to be detachable. Accordingly, the protective plate 370 can be further easily attached and detached while the protective plate 370 is disposed at a position deeper from the reading port 305 and protected from impact. Further, since the opening and closing members 310 and 311 for opening and closing the holes 307 and 308 are also used as members for supporting the end portions of the protection plate 370, the protection plate 370 can be stably held without increasing the number of parts. .

  In addition, since the opening and closing members 310 and 311 are made of a softer material than the case 303, when an impact occurs near the opening and closing members 310 and 311 when dropped or the like, this can be effectively absorbed, and as a result Protection can be effectively achieved.

  Further, holes 307 and 308 are formed in a pair of opposing walls 303c and 303d provided in the case 303, and the holes 307 and 308 are opened and closed by two opening and closing members 310 and 311, respectively. . Therefore, the attachment / detachment operation can be performed from any hole, and the attachment / detachment operation can be further facilitated. In addition, when the protection plate 370 is fixed, both ends of the protection plate 370 are supported by the both opening and closing members 310 and 311, so that the holding of the protection plate 370 is further stabilized. Furthermore, during the mounting operation in which the protective plate 370 is inserted and attached from one of the two holes 307 and 308, the tip of the protective plate 370 is directed toward the opening and closing members 310 and 311 attached to the other. Since the guide groove 380 for guiding is provided, the protective plate 370 inserted from the holes 307 and 308 can be smoothly guided to an appropriate position, which can contribute to improvement and speeding up of the mounting operation. .

  In addition, since the opening / closing members 310 and 311 are provided with the clamping portions 310a and 311a that sandwich the end portions of the protection plate 370 when the protection plate 370 is fixed, the displacement in the thickness direction of the protection plate 370 can be restrained. The displacement of the protective plate 370 can be effectively prevented.

[Fourth embodiment]
Next, a fourth embodiment will be described.
FIG. 22 is an explanatory view illustrating a state where the opening / closing member is removed from the barcode reader of the fourth embodiment. FIG. 23 is an explanatory view showing a state in which an opening / closing member is attached to the barcode reader of FIG. 24 is a cross-sectional view schematically showing the vicinity of the position EE in FIG. In the fourth embodiment, a part of the case 403 (engagement hole 406 and recess 408) is different from the case 303 (FIG. 15 and the like) and the configuration of the opening and closing member 410 is different from the opening and closing member 310 (FIG. 15 and the like). Only the point is different from the third embodiment, and other parts are the same as those of the third embodiment. Therefore, different portions will be described in detail, and the same portions will be denoted by the same reference numerals and detailed description thereof will be omitted, and will be described with reference to the third embodiment as appropriate.

  Similar to the third embodiment, the barcode reader 400 of the present embodiment has a light receiving optical system that receives reflected light from optical information (the same light receiving optical system as that of the third embodiment). The case 403 is housed. The case 403 is provided with the reading port 305 shown in FIGS. 15 to 17, and the same fixing member 360 (see FIGS. 15 to 17) as the third embodiment is connected to the reading port 305 in the case 403. The protective plate 370 identical to that of the third embodiment is attached to and detached from the fixing member 360. Similarly to the third embodiment, the protective plate 370 is fixed to the reading port 305 side of the fixing member 360 and transmits reflected light in the fixed state, and is fixed to the fixing member 360 by bending deformation. Is released and can be detached from the fixing member 360.

  On the other hand, as shown in FIG. 22, there are two holes for inserting and removing the protective plate 370 (the opposite side provided on the opposite side of the hole 407 and the hole 407) in the periphery of the protective plate 370 in the case 403. As shown in FIG. 23, two opening / closing members (opening / closing member 410 for opening / closing the hole 407 and an opening / closing member for opening / closing the opposite hole) are formed. (Not shown)) is provided. The protective plate 370 can be attached to and detached from the case 403 through the hole 407 or the opposite side hole, and is fixed by two opening and closing members (the opening and closing member 410 and the opening and closing member that opens and closes the opposite side hole). Both ends are supported. The open / close member 410 that opens and closes the hole 407 and the open / close member that opens and closes the opposite hole are also formed of a soft member softer than the case 403 as in the third embodiment.

  Furthermore, the opening / closing member 410 that opens and closes the hole 407 and the opening / closing member that opens and closes the opposite-side hole include an opening / closing main body that opens and closes the hole and a connecting portion that extends from the opening / closing main body. For example, the opening / closing member 410 shown in FIGS. 23 and 24 includes an opening / closing body 411 that opens and closes the hole 407 and a flexible connecting portion 412 that extends from the opening / closing body 411. Is configured to be easily bent and deformed, and is configured to engage the engagement hole 406 formed in the case 403 to connect the case 403 and the opening / closing main body 411. The opening / closing member that opens and closes the opposite side hole has the same configuration as the opening / closing member 410.

  Further, as shown in FIG. 24, the case 403 includes a cover area P covered by the opening / closing member 410 and a non-cover area (area other than the cover area P) that is not covered. A recess 408 is formed so as to straddle the non-cover region. Due to the presence of the recess 408, an entry path 409 that reaches the back side of the opening / closing member 410 is formed, and a fingertip or a tool for removal is made to enter the back side of the opening / closing member 410 via the entry path 409 to engage with the opening / closing member 410. (That is, it is easy to hook a fingertip or the like on the opening / closing member 410). Therefore, the opening / closing member 410 can be removed smoothly.

  Also in the present embodiment, the holes (the hole 407 and the opposite hole) have a pair of opposing walls (opposing walls 303c and 303d of the third embodiment (FIGS. 15 and 18) constituting a part of the case 403. Each of the holes (the hole 407 and the opposite hole) are opened and closed by two opening / closing members (opening / closing members 410 and an opening / closing member that opens and closes the opposite hole). The structure is made. When the protection plate 370 is fixed, both ends of the protection plate 370 are supported by both opening and closing members (opening and closing members that open and close the opening and closing member 410 and the opposite side hole). A guide groove (similar to the guide groove 380 in FIG. 19) that guides the tip of the protective plate 370 toward the opening / closing member attached to the other during the attachment operation to be inserted and attached from one of the two holes. Guide grooves) are provided.

  In addition, the opening / closing member (opening / closing member 410 and opening / closing member not shown) of the present embodiment also includes a clamping portion that sandwiches the end of the protection plate 370 when the protection plate 370 is fixed. One opening / closing member 410 shown in FIG. 24 is provided with a clamping portion 410a that fits into an end portion of the protective plate 370 and sandwiches the end portion. The clamping part 410a has a position holding function similar to the clamping parts 310a and 311a (see FIGS. 20 and 21) of the third embodiment.

  In the present embodiment, in the opening / closing member, an opening / closing main body for opening / closing the hole, and a flexible connecting portion for engaging the engagement hole formed in the case 403 to connect the case 403 and the opening / closing main body. In addition to the effects of the third embodiment, the opening / closing member can be engaged with the case 403 when the hole is opened, and loss of the opening / closing member can be effectively prevented. An effect is obtained.

[Other Embodiments]
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  The fixing member 160 of the second embodiment is configured to hold the pair of opposed end portions (end portions 175, 176) by the pair of holding grooves 163, 164 in a state where the protective plate 170 is elastically curved. 14, the protective plate 170 is held by a pair of holding grooves (only one holding groove 263 is shown in FIG. 14) without elastically bending the protective plate 170 as in the fixing member 260 shown in FIG. Also good. In addition, the holding groove of the fixing member 260 in FIG. 14 is configured so that the groove width gradually becomes narrower toward the bottom in the depth direction as shown in FIG. It is good also as a structure by which an edge part (edge part 175,176) is clamped by the inner wall of a holding groove.

  In the first embodiment, as shown in FIG. 5, the configuration in which the protrusions 74a, 74b, 74c, and 74d are formed on the inner edge portions of the inserted portions 73a, 73b, 73c, and 73d is illustrated. You may make it fit an insertion part and a convex part, without forming a projection part. On the contrary, in the second embodiment, the configuration in which the protrusions as in the first embodiment are not provided on the inner edge portions of the inserted portions 173a, 173b, 173c, and 173d is illustrated. However, in the configuration of the second embodiment, Protruding portions as in the first embodiment (that is, protruding portions 74a, 74b, 74c, and 74d) may be provided on the inner edge portions of the inserting portions 173a, 173b, 173c, and 173d.

  In the above embodiment, the barcode reader 1 is exemplified as the optical information reading device. However, the barcode reader 1 is not limited thereto, and may be configured as a two-dimensional code reader that reads a two-dimensional code as optical information.

FIG. 1 is a cross-sectional view schematically illustrating a main part of a bar code reader according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating an electrical configuration of the barcode reader according to the first embodiment. FIG. 3 is a view illustrating the protective plate attached to the fixing member, and is a cross-sectional view showing a cross section AA of FIG. 4. FIG. 4 is a view of the fixing member and the protective plate attached to the fixing member as viewed from the reading port side. FIG. 5 is a view of the protective plate as viewed from the reading port side. FIG. 6A is an enlarged view showing a part of the protection plate in an enlarged manner, and FIG. 6B is an enlarged view showing a part of the configuration in which the protection plate is fixed to the fixing member. FIG. 7 is an enlarged view showing a part of FIG. FIG. 8 is an explanatory diagram for explaining the operation of attaching and detaching the protective plate. FIG. 9 is a view for explaining the operation of attaching the protection plate, and is a cross-sectional view showing a state in which the protection plate is removed from the configuration of the BB cross section of FIG. FIG. 10 is a view of the protective plate used in the barcode reader of the second embodiment as seen from the reading port side. FIG. 11A is an enlarged view showing a part of the protection plate of FIG. 10, and FIG. 11B is a view of the part of FIG. 11A viewed from the lens side. FIG. 12 shows a modified configuration of FIG. 3, and is a cross-sectional view showing a fixing member and a protective plate attached to the fixing member in the barcode reader of the second embodiment. FIG. 13 is an enlarged view showing a part of FIG. FIG. 14 is a diagram showing a modification of FIG. FIG. 15 is a side view schematically illustrating the appearance of a barcode reader 300 according to the third embodiment of the present invention. FIG. 16 is an explanatory diagram for explaining a state in which the opening / closing member is removed from the barcode reader 300 of FIG. FIG. 17 is an explanatory diagram for schematically explaining the internal configuration of the barcode reader 300. FIG. 18 is a sectional view schematically showing the vicinity of the position AA in FIG. FIG. 19 is a cross-sectional view partially and schematically showing the vicinity of the position BB in FIG. FIG. 20 is a cross-sectional view schematically showing the vicinity of the CC position in FIG. FIG. 21 is a cross-sectional view partially showing a sandwiching configuration of the protective plate by the opening / closing member, and is a cross-sectional view schematically showing the vicinity of the DD position in FIG. 20. FIG. 22 is an explanatory view illustrating a state in which the opening / closing member is removed from the barcode reader 400 of the fourth embodiment. FIG. 23 is an explanatory view showing a state in which an opening / closing member is attached to the barcode reader of FIG. 24 is a cross-sectional view schematically showing the vicinity of the position EE in FIG.

Explanation of symbols

1,300,400 ... Bar code reader (optical information reader)
3,303,403 ... Case 5,305 ... Reading port 60,160,260,360 ... Fixing member 61,62 ... Tool escape hole 63,64,163,164 ... Holding groove 63a, 63b ... Holding groove inner wall 67a, 67b, 67c, 67d ... convex portions 70, 170, 270, 370 ... protective plates 71, 72 ... tool engaging portions 73a, 73b, 73c, 73d ... inserted portions 74a, 74b, 74c, 74d ... projections 75, 76 , 175, 176... End (opposite end)
177a, 178a ... first end 177b, 178b ... second end 303c, 303d ... opposite walls 307,308,407 ... holes 310,311,410 ... opening / closing members 310a, 311a ... clamping portion 380 ... guide groove 411 ... Opening / closing main body 412...

Claims (13)

An optical information reader having a light receiving optical system for receiving reflected light from optical information, a case having a reading port,
A fixing member disposed between the reading port and the light receiving optical system;
The fixing member is fixed to the reading port side, and is configured to transmit the reflected light in the fixing state, and is fixed to the fixing member by bending deformation and can be detached from the fixing member. A protective plate
An optical information reading apparatus comprising: An optical information reader having a light receiving optical system for receiving reflected light from optical information, a case having a reading port,
A fixing member disposed between the reading port and the light receiving optical system;
A protective plate that is fixed to the fixing member, transmits the reflected light in the fixed state, and is removable from the fixing member;
With
A hole for taking in and out the protection plate is formed in the periphery of the protection plate in the case,
An opening and closing member for opening and closing the hole is provided;
The optical information reading apparatus according to claim 1, wherein the protective plate is detachably attached to the case through the hole, and an end portion is supported by the opening / closing member when fixed. A hole for taking in and out the protection plate is formed in the periphery of the protection plate in the case,
An opening and closing member for opening and closing the hole is provided;
2. The optical information reader according to claim 1, wherein the protection plate is detachable from the case through the hole, and an end portion is supported by the opening / closing member when the protection plate is fixed.   The optical information reader according to claim 2, wherein the opening / closing member is made of a soft member softer than the case. The holes are respectively formed in a pair of opposing walls that constitute a part of the case,
Each hole is configured to be opened and closed by the two opening and closing members,
At the time of fixing the protection plate, both opening and closing members are configured to support both ends of the protection plate,
A guide groove is provided for guiding the front end of the protective plate toward the opening / closing member attached to the other during an attachment operation in which the protective plate is inserted and attached from one of the two holes. The optical information reader according to any one of claims 2 to 4, wherein the optical information reader is provided.   The optical information reader according to any one of claims 2 to 5, wherein the opening / closing member includes a holding portion that holds an end portion of the protection plate when the protection plate is fixed.   The opening / closing member includes an opening / closing body part that opens and closes the hole part, and a flexible connecting part that engages with an engagement hole formed in the case and connects the case and the opening / closing body part. The optical information reader according to any one of claims 2 to 6, further comprising: The protective plate is
A plurality of inserted portions consisting of holes or notches, and
In the protective plate, a tool engaging portion formed of a hole or a notch, each formed in the vicinity of opposing ends facing each other,
With
The fixing member is
A plurality of convex portions respectively fitting with the plurality of inserted portions;
A tool relief hole for escaping the tool inserted in the tool engaging portion;
With
A protrusion is formed on the inner edge of the inserted portion,
2. The protrusion according to claim 1, wherein the protrusion is elastically deformed according to the fitting between the protrusion and the inserted portion, and the protrusion is pressed and held by a restoring force corresponding to the elastic deformation. The optical information reading device described.   The optical information reading device according to claim 8, wherein the tool engaging portion is formed in the vicinity of both ends in the longitudinal direction of the protection plate. The inserted portion comprises a long hole extending in the longitudinal direction of the protective plate,
The optical information reading apparatus according to claim 9, wherein the convex portion can move relatively in the elongated hole in accordance with the bending deformation of the protective plate. The fixing member includes a pair of holding grooves that respectively hold the pair of opposed end portions of the protection plate,
The holding groove has a configuration in which the groove width gradually narrows in the depth direction bottom side,
11. The optical device according to claim 8, wherein the opposing end portion is sandwiched between inner walls of the holding grooves in a fixed state in which the protection plate is fixed to the fixing member. Information reader. The fixing member includes a pair of holding grooves that respectively hold the pair of opposed end portions of the protection plate,
The opposing end portion is branched into a first end portion whose tip is accommodated in the holding groove and a second end portion whose tip is accommodated in the holding groove in an elastically deformed state,
The protective plate has a biasing force for expanding the tip of the first end and the tip of the second end in the groove width direction of the holding groove by a restoring force according to elastic deformation of the second end. Is configured to occur,
The said fixing member hold | maintains a pair of said opposing edge part with a pair of said holding groove in the state which curved the said protection plate elastically, It is any one of Claims 8-10 characterized by the above-mentioned. The optical information reading device described in 1. The fixing member is a lens member in which a condensing lens that condenses the illumination light is formed in part.
The optical information reader according to any one of claims 1 to 12, wherein the protective plate is attached to the lens member at a position that does not overlap with the condenser lens.

Images