JP2012004014A - Electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic equipment capable of determining the position of a light guide member and a light-emitting element and fixing the light guide member to a circuit board side with a relatively simple structure.SOLUTION: The electronic equipment 10 has a circuit board 2 on which a light-emitting diode 1 being a light emitting element is mounted and a light guide member 3 which is provided in the circuit board 2 and guides light emitted from the light-emitting diode 1 and emits in a direction different from the main light-emitting direction of the light-emitting diode 1, and the circuit board 2 and the light guide member 3 are housed in an inner space surrounded by a case 4 and a cover member 20 on which a display part 20a to display light from the light guide member 3 is arranged. The light guide member 3 has an engaging part 3a which penetrates and engages with a through-hole 2a provided in the circuit board 2, and the case 4 has a pressing member 4b that is in contact with the light guide member 3 and presses the light guide member 3 to the cover member 20 side installed on an inner side face 4a side of the case 4 that is oppositely arranged through the circuit board 2 and the light guide member 3.

Description

  The present invention relates to an electronic device in which a light guide member that guides light from a light emitting element in a desired direction is fixed to a circuit board on which the light emitting element is mounted.

  In recent years, in response to demands for energy saving, various sensors provided in lighting equipment and air conditioning equipment, a data logger that receives and records signals from the sensors, and a computer that processes data from the data logger In this way, power usage and temperature management are performed to improve the usage conditions.

  An electronic device such as a data logger used in this type of system has a plurality of light emitting elements (for example, light emitting diodes) for confirming the operation state such as input of signals from various sensors and output of data to a computer. ) Is provided. Since this type of electronic equipment is added to various types of equipment, it is preferable to make it as small as possible. Further, in order to make it easy for the user to check the operation state, the electronic device blinks a light emitting diode for checking the state on the front side of the electronic device that is easy to check.

  Therefore, for example, an electronic device has a circuit board on which electronic components are mounted upright with respect to the front surface of the electronic device, and transmits light from a light-emitting diode for operation state confirmation mounted on the circuit board. The light guide member guides the light to the front side of the electronic device and emits it to the outside.

  As this type of electronic apparatus, one using a light guide member 3 ′ shown in FIG. 5 is known (for example, Patent Document 1).

  In the light guide member 3 ′ shown in FIG. 5, for example, the incident surface 3 b of the light guide member 3 ′ faces the light emitting surface of a light emitting diode (not shown) mounted on a circuit board (not shown). Arranged in position. The light from the light emitting diode is guided inside the light guide member 3 ′ and emitted from the exit surface 3 d of the light guide member 3 ′. The light guide member 3 ′ can reflect the light incident from the incident surface 3 b in the predetermined direction by the reflecting surface 3 ca and emit the light from the emitting surface 3 d. The light guide member 3 ′ includes an incident surface 3b, a reflective surface 3ca, and an output surface 3d for each of the plurality of light emitting diodes, so that light from each light emitting diode can be respectively desired via the light guide member 3 ′. It is possible to emit from the position.

  In addition, in the light guide member 3 ′ shown in FIG. 5, in order to guide light from the plurality of light emitting diodes separately, a plurality of light guide units each including an incident surface 3b, a reflective surface 3ca, and an output surface 3d are provided. It connects with the connection part 3e. In addition, the light guide member 3 ′ is provided with attachment pieces 31 on both end sides (left and right in FIG. 5A) of the connecting portion 3 e, and a screw (not shown) is inserted through the screw insertion hole 31 a of the attachment piece 31. The circuit board side can be screwed.

  By using the light guide member 3 ′, the electronic device can take out light from the light emitting diode from the light exit surface 3 d of the light guide member 3 ′ separately from the position of the light emitting diode mounted on the circuit board.

  As a result, the electronic device can transmit light from the light-emitting diode even when the circuit board on which the light-emitting diode for operation state confirmation is mounted in the direction perpendicular to the front surface of the electronic device. Through 3 ', it can be efficiently emitted to the outside from the front side of the electronic device.

Japanese Patent Laid-Open No. 10-142426

  By the way, in the light guide member 3 ′, the light from the light emitting diode leaks from the incident surface 3 b unless the relative position of the incident surface 3 b of the light guide member 3 ′ facing the light emitting surface of the light emitting diode is matched. The brightness of the light emitted from the exit surface 3d of the member 3 ′ decreases. However, it is difficult to accurately align the relative position between the light emitting surface of the light emitting diode and the incident surface 3b of the light guide member 3 'facing the light emitting surface. In recent years, with the miniaturization of electronic devices, there is an increasing tendency that it is difficult to accurately match the light emitting diode and the incident surface 3b of the light guide member 3 '.

  In the electronic device described above, if the light guide member 3 ′ is fixed on the circuit board with a screw, the position may be shifted when the screw is tightened. In addition, if the light guide member 3 ′ and the circuit board are not sufficiently fixed, the incident surface 3b of the light guide member 3 ′ facing the light emitting surface of the light emitting diode may be caused by an assembly process of electronic equipment or vibration during installation. The relative position of may be shifted.

  Therefore, when it is desired to further reduce the size of the electronic device, the structure of the electronic device described above is not sufficient, and further improvements are required.

  The present invention has been made in view of the above reasons, and its object is to determine the positions of the light guide member and the light emitting element with a relatively simple configuration and fix the light guide member to the circuit board side. It is to provide an electronic device capable of performing the above.

  An electronic apparatus according to the present invention guides light emitted from the light emitting element provided on the circuit board on which the light emitting element is mounted, and emits the light in a direction different from the main light emitting direction of the light emitting element. The circuit board and the light guide member are housed in an internal space surrounded by a housing and a cover member provided with a display unit for displaying light from the light guide member. In the electronic device, the light guide member is provided with an engaging part for being inserted into and engaged with a through hole formed in the circuit board, and the housing includes the circuit board and the A pressing member that contacts the light guide member and presses the light guide member toward the cover member is provided on the inner side surface of the casing facing the light guide member.

  The electronic device according to the present invention has a relatively simple structure, and can provide an electronic device that can determine the positions of the light guide member and the light emitting element and can fix the light guide member to the circuit board side. There is.

It is a decomposition explanatory view showing electronic equipment of an embodiment. It is a perspective view of an electronic device same as the above. The principal part of an electronic device same as the above is shown, (a) is a front view, (b) is a rear view. The other principal part of an electronic device same as the above is shown, (a) is a bottom view, (b) is a side view, (c) is a perspective view. The principal part of the conventional electronic device is shown, (a) is a bottom view, (b) is a side view.

  Hereinafter, the electronic device 10 of this embodiment will be described with reference to FIGS. 1 to 4.

  As shown in the exploded explanatory views of FIGS. 1A and 1B, the electronic device 10 of this embodiment includes a circuit board 2 on which a light emitting diode 1 as a light emitting element is mounted, and light emission provided on the circuit board 2. A light guide member 3 that guides light emitted by the diode 1 and emits the light in a direction different from the main light emitting direction of the light emitting diode 1, and the circuit board 2 and the light guide member 3 guide the housing 4. It is housed in an internal space surrounded by a cover member 20 provided with a display portion 20a for displaying light from the light member 3.

  In particular, in the electronic device 10 according to the present embodiment, the light guide member 3 is provided with an engaging portion 3a for being inserted into and engaged with a through hole 2a that is formed through the circuit board 2. Further, in the electronic device 10 of the present embodiment, the housing 4 contacts the light guide member 3 on the inner side surface 4a side of the housing 4 facing the circuit board 2 with the light guide member 3 interposed therebetween. A pressing member 4b that presses 3 toward the cover member 20 is provided.

  More specifically, in the electronic device 10 of the present embodiment, a plurality of (here, 11) surface-mounted light-emitting diodes 1 as light-emitting elements are predetermined on one surface 2 b of the flat circuit board 2. (See FIG. 1A). A light guide member 3 that emits light in a direction different from the main light emitting direction of the light emitting diode 1 is provided on one surface 2 b of the circuit board 2. The light guide member 3 directs light from the light emitting diode 1 that emits light in a direction perpendicular to the one surface 2b as a main light emitting direction of each light emitting diode 1 in a direction substantially parallel to the one surface 2b. The light guide member 3 is in a direction substantially parallel to the one surface 2b, and the display unit 20a of the cover member 20 (left side in FIG. 1A) of the electronic device 10 provided on the front side where the housing 4 is opened. To emit light from the light emitting diode 1 separately.

  The circuit board 2 is provided with two rectangular through holes 2 a penetrating in the thickness direction of the flat circuit board 2. The light guide member 3 has a plurality of light guide portions 3c connected by a connecting portion 3e. The light guide member 3 is provided with engaging portions 3a for inserting and engaging with the through holes 2a of the circuit board 2 at both ends of the plurality of light guide portions 3c connected by the connecting portions 3e. . The light guide member 3 is engaged with a pair of engaging portions 3 a inserted through the through holes 2 a of the circuit board 2. The light guide member 3 has three protruding portions 3f protruding at a predetermined distance from the circuit board 3 at substantially equal intervals in the connecting portion 3e. The light guide member 3 inserts the engaging portion 3a into the through hole 2a and engages the light guide member 3 so that the protruding portion 3f is brought into contact with the one surface 2b of the circuit board 2.

  The circuit board 2 and the light guide member 3 are housed in a box-shaped casing 4 whose outer shape is a rectangular parallelepiped and whose front surface is open. The housing 4 is brought into contact with the connecting portion 3e of the light guide member 3 on the inner surface 4a side of the housing 4 facing the circuit board 2 with the light guide member 3 interposed therebetween, so that the light guide member 3 is placed on the cover member 20 side. A pressing member 4b is provided to press (see FIG. 1B). The pressing member 4b provided on the inner side surface 4a side of the housing 4 is in a linear shape parallel to the light guide portion 3c so as not to come into contact with the light guide portion 3c and in contact with the connecting portion 3e of the light guide member 3. Forming. In addition, the light guide member 3 in FIG. 1B is illustrated by a broken line in order to explain a contact portion with the inner side surface 4 a side of the housing 4.

  Here, in the electronic device 10 of the present embodiment, the circuit board 2 on which the light emitting diode 1 and various electronic components are mounted and the light guide member 3 is engaged is placed in an internal space surrounded by the housing 4 and the cover member 20. By storing, the inner surface 4a side of the housing 4 and the light guide member 3 are brought into contact with each other, and the light guide member 3 is pressed toward the cover member 20 side.

  The electronic device 10 according to the present embodiment includes an engagement piece 20b provided on the vertically long side surface of the cover member 20 shown in FIG. 1A from the front side where the case 4 is opened, as shown in FIG. The data logger as the control device shown in FIG. 2 is obtained by fitting into the fitting portion 4d provided on the vertically long side surface of the four.

  Hereinafter, a data logger will be briefly described as the electronic device 10 of the present embodiment.

  For example, in a system for temperature management and power monitoring for the purpose of energy saving, the data logger that is the electronic device 10 uses the measured values of various sensors that measure the power consumption, temperature, and the like of facility equipment as electrical and voltage values and currents. It is used to convert to signal data and store data. Therefore, the data logger that is the electronic device 10 of the present embodiment includes a connection terminal unit connected to various sensors by serial communication, a record holding unit that stores data, and an external unit that performs data analysis, recording, and report generation And a communication unit for transferring data via a LAN (Local Area Network) or a WAN (Wide Area Network).

  Therefore, the data logger shown in FIG. 2 includes a first connection terminal portion 15 provided with a pair of a terminal for RC232C, which is a serial communication standard connectable to various sensors, and a terminal for RS485. Is provided on the cover member 20 side which is the front side of the. Further, the data logger is provided with a USB connector 13, a LAN connector 14, and a second connection terminal portion 19 for power connection on the cover member 20 side so that it can be connected to a computer via a LAN or WAN. The data logger is provided with an openable / closable cover 18 on the surface side of the cover member 20. In the data logger, when the openable cover 18 is opened, a slot portion (not shown) appears. By inserting a removable recording medium (for example, a small memory card) into the slot portion of the data logger, data of the data logger can be recorded on the recording medium.

  In the data logger, for example, the signal value of the power consumption amount of lighting equipment or air conditioning equipment measured by a wattmeter as a sensor is input via a signal connection standardized by RS485 or RS2323C. The data logger is connected to a remote computer via a LAN. Thus, the remote computer can perform centralized management and monitoring of data via the data logger. Note that the data logger may transmit and receive data using a wireless unit (not shown) or the like when it is difficult to newly lay signal wiring of RS485 or RS2323C that is wired with existing equipment.

  The circuit board 2 with which the light guide member 3 as shown in FIG. 3A is engaged is accommodated in the housing 4 of the data logger which is the electronic apparatus 10 of this embodiment. In the circuit board 2, a light guide member 3 is provided on the one surface 2 b side of the circuit board 2, and an engaging portion 3 a of the light guide member 3 is inserted into the through hole 2 a of the circuit board 2. Various electronic components and connectors 16 (not shown) are mounted on one surface 2b of the circuit board 2.

  On the other surface 2c side of the circuit board 2, as shown in FIG. 3B, the engaging portion 3a of the light guide member 3 protruding from the through hole 2a of the circuit board 2 is between the rectangular openings in the through hole 2a. The circuit board 2 is engaged with a wider engaging protrusion 3aa. In addition, the electronic device 10 disposed toward the cover member 20 side of the electronic device 10 on the end surface side (the right side in FIG. 3B) of the circuit board 2 on which the light emitting surface 3 d of the light guide member 3 is disposed. A toggle switch 11 for turning on / off the power supply, a reset switch 12 for resetting driving of the electronic device 10, a USB connector 13, a LAN connector 14, and a first connection terminal portion 15 are mounted. Further, on the other surface 2c of the circuit board 2, various electronic components (not shown), a connector 16 and a dip switch 17 for communication setting are mounted.

  For example, when the data logger is formed in a vertically long rectangular parallelepiped shape in order to increase the degree of freedom of the installation location of the data logger, the circuit board 2 disposed inside the housing 4 is also disposed in the vertical direction. In such a vertically long electronic device 10, the circuit board 2 is set up substantially vertically. Therefore, if the light guide member 3 is simply mounted on the circuit board 2 without being fixed, the electronic device 10 can be When subjected to some vibration, a relative positional shift between the light guide member 3 and the circuit board 2 occurs. For this reason, in a data logger that simply mounts the light guide member 3 on the circuit board 2 without being fixed, the position of the incident surface 3b of the light guide member 3 facing the light emitting surface of the light emitting diode 1 is shifted, and the luminance of the display unit 20a. May be caused.

  In the electronic device 10 of the present embodiment, two engaging portions 3a are provided on the light guide member 3 so that the light guide member 3 is positioned on the circuit board 2 in a completed state of the electronic device 10, and the engagement is performed. The part 3 a is configured to be hooked in a through hole 2 a that is provided in the thickness direction of the circuit board 2. Further, in the electronic device 10 having a structure in which the engaging portion 3 a of the light guide member 3 is hooked in the through hole 2 a of the circuit board 2, the gap between the engaging portion 3 a of the light guide member 3 and the through hole 2 a of the circuit board 2 is set. A gap may occur.

  However, in the electronic device 10 of the present embodiment, the pressing member 4b is provided on the inner wall surface 4a side of the housing 4, and the light guide member 3 that contacts the pressing member 4b is pressed by the pressing member 4b. Thereby, the electronic device 10 can fix the light guide member 3 to the circuit board 3 side without the positional deviation of the light guide member 3 with respect to the light emitting diode 1 in the completed state of the electronic device 10. It becomes.

  Therefore, even when the electronic device 10 is subjected to vibration or the like with the circuit board 3 standing in the housing 4, the light emitting surface of the light emitting diode 1 and the incident surface 3 b of the light guide member 3 It is possible to suppress the occurrence of relative positional deviation.

  Next, each member used for the electronic device 10 of this embodiment will be described in detail.

  The light emitting element used in the electronic apparatus 10 of the present embodiment is exemplified by using the surface mount type light emitting diode 1 mounted on the one surface 2b side of the circuit board 2, but on the other surface 2c side of the circuit board 2. The light emitting diode 1 may be mounted. In this case, in order to allow the light from the light emitting diode 1 to enter the incident surface 3b of the light guide 3, a through hole (not shown) that can emit the light of the light emitting diode 1 may be provided in the circuit board 2. . The light emitting diode 1 may have a lens on the surface in order to increase the light utilization efficiency, or may have a smooth surface in order to improve the optical coupling property with the incident surface 3 b of the light guide member 3. Further, the light emitting element is not limited to the light emitting diode 1 and various semiconductor light emitting elements may be used.

  The light-emitting diode 1 as a light-emitting element can display various states such as the driving state of the electronic device 10, the connection state with the LAN, and the connection state in the RC232C or RS485. In the electronic device 10 of this embodiment, the surface-mounted light-emitting diode 1 is soldered relatively easily by a reflow soldering method on a wiring pattern (not shown) formed on the one surface 2b side of the circuit board 2. be able to.

  The circuit board 2 used in the electronic apparatus 10 of the present embodiment is provided with a wiring pattern (not shown) on the one surface 2b side and the other surface 2c side, and the circuit wiring is configured by the wiring pattern. The plurality of surface-mounted light-emitting diodes 1 are configured to be able to supply power to each of the wiring patterns. Similarly, the toggle switch 11, reset switch 12, USB connector 13, first connection terminal portion 15, connector 16, dip switch 17 and various electronic components mounted on the circuit board 2 are electrically connected by a wiring pattern. I am letting. Such a circuit board 2 can be configured using, for example, a glass epoxy resin substrate or a ceramic substrate on which a wiring pattern made of copper foil or the like for configuring a circuit is formed.

  The light guide member 3 used in the electronic apparatus 10 of the present embodiment can be formed into an appropriate shape by, for example, an injection molding technique using an acrylic resin as a translucent resin.

  The light guide member 3 is emitted from the light guide member 3 to the display unit 20a made of a translucent resin or the like provided on the cover member 20 so that the light of the light emitting diode 1 can be viewed from the front side of the electronic device 10. The light emitting member 3 may be configured to emit light, or the light exit surface 3c of the light guide member 3 may be directly inserted into a penetrating portion provided in the cover member 20 of the electronic device 10 to form the display unit 20a.

  The light guide member 3 efficiently guides light from the light emitting diode 1 even if the position of the light emitting diode 1 mounted on the circuit board 2 is different from the position of the display unit 20 a provided on the cover member 20. The light can be emitted to the outside from the display unit 20 a of the electronic device 10 through the member 3.

  The light guide member 3 shown in FIG. 4 includes eleven light guide portions 3c that allow light from the respective light emitting diodes 1 to be incident from the incident surface 3b, reflected by the reflective surface 3ca, and emitted from the output surface 3d. . Each light guide portion 3c is connected by a connecting portion 3e on the incident surface 3b side and the exit slope 3d side. Further, the light guide member 3 is protruded from the incident surface 3b of the light guide part 3c on both ends (see FIGS. 4A and 4C) where the light guide part 3c is connected by the connection part 3e. A joint portion 3a is provided.

  The light guide member 3 is disposed at a position where the incident surface 3 b faces the light emitting surface of the light emitting diode 1 mounted on the circuit board 2, and the light from the light emitting diode 1 that guided the inside of the light guiding member 3 is guided. The light exits from the exit surface 3d of the optical member 3. The light guide member 3 appropriately sets the light guide path until the light incident from the incident surface 3b is emitted from the output surface 3d, thereby allowing the light from the light emitting diode 1 to be transmitted through the light guide member 3 to a desired state. The light can be emitted from the position. The light guide member 3 can freely design the position of the exit surface 3d and the mounting position of the light emitting diode 1 optically coupled to the entrance surface 3b by appropriately providing the reflection surface 3ca on the light guide 3c. it can.

  In the light guide member 3, the engaging portions 3a of the light guide member 3 are inserted from the one surface 2a side of the circuit board 2 into a plurality of (two in this case) through holes 2a penetrating the flat circuit board 2. Let The engaging portions 3a protruding from the light guide member 3 of the present embodiment are provided on both ends of the connecting piece 3e of the light guide member 3, and the engaging protrusions 3aa are provided at the distal ends of the engaging portions 3a. ing. In order to engage the light guide member 3 and the circuit board 2, the engaging portion 3 a of the light guide member 3 may be pushed into the through hole 2 a of the circuit board 2.

  Thereby, the engagement protrusion 3aa of the light guide member 3 bends in the direction in which the pair of engagement protrusions 3aa approach each other in the through hole 2a. When the engaging protrusion 3aa of the light guide member 3 protrudes from the through hole 2a to the other surface 2c side of the circuit board 2, the pair of engaging protrusions 3aa expands in a direction away from each other by the elastic force of the engaging portion 3a ( (Refer FIG.3 (b)). The engaging protrusion 3aa in the engaging portion 3a of the light guide member 3 is hooked on the other surface 2c of the circuit board 2.

  The housing 4 used in the electronic apparatus 10 of the present embodiment is in contact with the light guide member 3 on the inner side surface 4a side facing the circuit board 2 via the light guide member 3, and the light guide member 3 on the cover member 20 side. What is necessary is just to provide the pressing member 4b which can press. Therefore, in the electronic device 10 according to the present embodiment, the light guide member 3 and the pressing member 4b do not necessarily need to directly contact each other.

  The housing | casing 4 can be comprised with various resin materials and metal materials. When the circuit board 2 and the light guide member 3 are inserted from the front side where the housing 4 is opened, the insertion of the light guide member 3 is guided on the inner surface 4a side of the housing 4 when the resin material is used. The hollow part 4c to be able to be provided can be provided (refer FIG.1 (b)). When the recess 4c is provided on the inner surface 4a side of the housing 4, it is preferable to provide a rib that increases the strength of the recess 4c. In this case, the housing 4 may be configured as a pressing member 4b that presses and fixes the light guide member 3 using a rib that increases the strength of the inner side surface 4a. That is, the rib provided on the inner side surface 4 of the housing 4 becomes the pressing member 4b. Further, when the light guide member 3 is inserted into the housing 4, the recess 4 c of the housing 4 does not come into contact with the end portion 3 ab of the engaging portion 3 a of the light guide member 3 so as to be inserted too much. A function as a proper stopper may be provided (see FIG. 1B).

  In the electronic device 10 of the present embodiment, the fitting portion 4d provided on the inner side surface 4a of the housing 4 is engaged with the engagement piece 20b of the cover member 20 by fitting the cover member 20 to the housing 4. Data logger.

  The electronic apparatus 10 of the present embodiment configured as described above inserts the engaging portion 3a of the light guide member 3 into the through hole 2a of the circuit board 2 and presses the light guide member 3 with the pressing member 4b of the housing 4. With the relatively simple configuration, the positions of the light guide member 3 and the light emitting diode 1 as the light emitting element can be determined and fixed. Therefore, the electronic device 10 according to the present embodiment can suppress a decrease in luminance due to the positional deviation between the light emitting diode 1 and the light guide member 3.

1 Light-emitting diode (light-emitting element)
2 Circuit board 2a Through hole 3 Light guide member 3a Engagement part 4 Housing 4a Inner side face 4b Press member 10 Electronic device 20 Cover member 20a Display part

Claims (1)

A circuit board on which the light emitting element is mounted; and a light guide member that is provided on the circuit board and guides light emitted from the light emitting element to emit in a direction different from a main light emitting direction of the light emitting element. The circuit board and the light guide member are electronic devices housed in an internal space surrounded by a casing and a cover member provided with a display unit for displaying light from the light guide member,
The light guide member is provided with an engaging portion for being inserted into and engaged with a through-hole penetrating the circuit board, and the housing is interposed between the circuit board and the light guide member. An electronic apparatus, comprising: a pressing member that contacts the light guide member and presses the light guide member toward the cover member on an inner surface side of the opposite housing.

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