JP2008192467A - Light emission device, display, and button device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to flexibly respond to change of positions in mounting on a printed board. <P>SOLUTION: The device is provided with a printed board 210, a light guide plate mounted on the printed board 210 for irradiating light toward front, LEDs 214 mounted on the printed board 210 for irradiating light on the light guide plate 212, and a plurality of silk-printed reflection areas 216 fitted to a part of the area of the printed board 210 on which the light guide plate 212 is mounted. With this light emission device, as well as the display device and the button device, the farther the reflection areas get away from the LEDs, the larger the density of the reflection areas 216 is. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light emitting device, a display device, and a button device, and more particularly to a light emitting device, a display device, and a button device that emit light emitted from a light emitting element to the front using a light guide plate.

  As a conventional navigation device, a simple portable portable device called a personal navigation device (hereinafter referred to as a portable navigation device), and a recess (DIN opening) formed in the dashboard of the vehicle A vehicle-mounted navigation device that is housed and fixed inside is widely known. A vehicle-mounted navigation device can provide highly accurate guidance based on information such as a vehicle speed from a vehicle, and a device equipped with an audio device has also been proposed.

  In recent years, a navigation device that combines the portability of a portable navigation device with the highly accurate guidance performance of an in-vehicle navigation device has been studied.

  Patent Documents 1 to 4 disclose a configuration in which a navigation unit can be detached from an in-vehicle device mounted on a vehicle. By removing the navigation unit from the in-vehicle device, the navigation unit can be used alone as a portable navigation. In Patent Document 5, it is possible to remove the navigation device from the vehicle and use the navigation device even during walking. Further, it is disclosed that the car navigation mode is set when the vehicle is mounted, and the man navigation mode is executed when the vehicle is detached from the vehicle.

In the operation unit of such an in-vehicle device, a display unit using liquid crystal or a light emitting device for illumination of operation buttons is used. The light emitting device makes light emitted from a light emitting element such as a light emitting diode (LED) uniform by a light guide plate and emits the light to the front.
JP-A-8-318792 JP 2002-328026 A JP 2005-524570 A JP 2001-239895 A JP 2003-166848 A

  For example, a light emitting device used for an operation unit of an in-vehicle device is small and is mounted on a printed board on which electronic components are mounted. Unlike a display device such as a display, such a light emitting device does not require luminance and is small. Therefore, a small number of LEDs are used as light emitting elements that emit light to the light guide plate. Furthermore, in the design stage of the printed circuit board of the operation unit, the arrangement of components related to operations such as operation buttons is given priority, and the arrangement of light emitting elements and light guide plates of the light emitting device is often determined last. Thus, since a small number of LEDs are used as light emitting elements, the luminance distribution of the light guide plate as viewed from the front tends to increase. Therefore, the shape of the light guide plate may be devised to suppress the luminance distribution of the light guide plate viewed from the front. However, the arrangement of the light emitting elements and the light guide plate may be changed after a mold for producing the light guide plate is formed. As described above, it is difficult for the conventional light emitting device to flexibly cope with a change in the mounting arrangement.

  The present invention has been made in view of the above problems, and an object thereof is to provide a light emitting device, a display device, and a button device that can flexibly cope with a change in arrangement to be mounted on a printed board.

  The present invention includes a printed circuit board, a light guide plate that is mounted on the printed circuit board and emits light to the front surface, a light emitting element that is mounted on the printed circuit board and emits light to the light guide plate, and the light guide plate. And a plurality of reflective areas silk-printed on a part of the printed circuit board area, and the density of the reflective area increases with distance from the light emitting element. . According to the present invention, the density of the reflection region increases as the distance from the light emitting element increases, so that the luminance distribution of the light guide plate can be reduced. In addition, since the reflective region can be easily formed by forming the reflective region using silk printing, it is possible to flexibly cope with a change in arrangement of the light guide plate and the light emitting element mounted on the printed board.

  The said structure WHEREIN: The shape seen from the said front of the said light-guide plate is a rectangle, the said light emitting element is provided in the side of the short side of the said light-guide plate, The said several reflective area is the length of the said light-guide plate. The light guide plate may be arranged in the direction and extend in the width direction of the light guide plate. According to this configuration, the luminance distribution viewed from the front can be easily adjusted.

  Moreover, the said structure WHEREIN: The shape seen from the said front of the said light-guide plate can be set as the structure which is cyclic | annular.

  The said structure WHEREIN: The said light emitting element can be set as the structure which is LED. According to this configuration, it is easy to change the layout of the printed board by using LEDs as the light emitting elements.

  The present invention includes a display panel, a printed board, a light guide plate that is mounted on the printed board and emits light to the display panel, a light emitting element that is mounted on the printed board and emits light to the light guide plate, And a plurality of silk-printed reflective areas provided in a part of the printed board area on which the light guide plate is mounted, and the density of the reflective areas increases as the distance from the light emitting element increases. It is a display device. According to the present invention, the luminance distribution as viewed from the front is small, and it is possible to flexibly cope with a change in arrangement of the light guide plate and the light emitting element mounted on the printed board.

  The present invention provides a button main body, a printed circuit board on which a switch unit pressed by the button main body is mounted, a light guide plate mounted on the printed circuit board and emitting light to the button main body, and the printed circuit board A light-emitting element that emits light to the light guide plate, and a plurality of silk-printed reflection regions provided in a part of the region of the printed board on which the light guide plate is mounted, and the light emission The button device is characterized in that the density of the reflection region increases with distance from the element. According to the present invention, the luminance distribution as viewed from the front is small, and it is possible to flexibly cope with a change in arrangement of the light guide plate and the light emitting element mounted on the printed board.

  According to the present invention, the density of the reflection region increases as the distance from the light emitting element increases, so that the luminance distribution of the light guide plate can be reduced. In addition, since the reflective region can be easily formed by forming the reflective region using silk printing, it is possible to flexibly cope with a change in arrangement of the light guide plate and the light emitting element mounted on the printed board.

  Embodiments will be described below with reference to the drawings.

  FIGS. 1A and 1B show the appearance of the in-vehicle system 1. As shown in FIGS. 1A and 1B, the in-vehicle system 1 includes an in-vehicle device 100 (an in-vehicle electronic device) mounted on a vehicle and a portable device 10 (a portable navigation device) having a navigation function. The The portable device 10 can be used by being attached to the front surface portion 120 of the in-vehicle device 100 as shown in FIG. 1 (A), or can be used by being detached from the in-vehicle device 100 as shown in FIG. 1 (B). Thus, the portable device 10 is detachable from the in-vehicle device 100, and the portable device 10 can be attached to the in-vehicle device 100.

  The in-vehicle device 100 is a device capable of reproducing a radio broadcast reproduction function and music data written on a recording medium such as a CD (Compact Disc), and includes an in-vehicle device main body 110 having a CD reproduction unit and a CD insertion / extraction port. And a front surface portion 120 having a display portion 131 and an operation portion 132. The portable device 10 has a navigation function of searching for a guide route to a destination and displaying the searched guide route on a map.

  FIG. 2 shows a state where the portable device 10 is detached from the in-vehicle device 100. The front surface portion 120 of the in-vehicle device 100 is provided with an attaching / detaching portion 170 in which a recess for attaching the portable device 10 is formed. The detachable portion 170 is provided with a connector 150 for electrically connecting the in-vehicle device 100 and the portable device 10 and a lock mechanism (not shown) for fixing the portable device 10 to the front surface portion 120. . When the removal button 160 provided on the front surface portion 120 is operated, a lock mechanism (not shown) is released, and the portable device 10 can be detached from the in-vehicle device 100.

  FIG. 3 shows a state in which the front surface portion 120 is inclined with respect to the in-vehicle device main body 110 and the CD insertion / extraction port 180 is exposed. By driving the slider 181 shown in FIG. 3 by a drive mechanism (not shown), the front surface part 120 can be tilted with respect to the in-vehicle apparatus main body 110. By the tilting operation, the CD insertion / extraction port 180 provided in the in-vehicle apparatus main body 110 is exposed, and the CD can be inserted / extracted. An operation button (tilt / eject button 132a shown in FIG. 6) is provided on the front surface portion 120 of the in-vehicle device 110, and a tilt angle corresponding to the operation of this button can be set.

  FIG. 4 shows an example of mounting the in-vehicle system 1 on a vehicle. For example, as shown in FIG. 4, the in-vehicle system 1 is disposed in a dashboard portion at a substantially center between a driver seat 52 and a passenger seat 51. Although not shown, a GPS antenna of a GPS information receiving unit 133, which will be described later, is disposed on the dashboard or attached to the vehicle interior side of the windshield.

  FIG. 5 is a block diagram illustrating a schematic configuration of the in-vehicle system 1. The in-vehicle device 100 and the portable device 10 are electrically connected by a connector. A connector 150 is provided on the in-vehicle device 100 side, and a connector 30 is provided on the portable device 10. By connecting these connectors 150 and 30, various signals are transmitted and received between the in-vehicle device 100 and the portable device 10 and function as the in-vehicle system 1. In addition, the connectors 150 and 30 are provided with power supply terminals for supplying power from the vehicle battery to the portable device 10, and the in-vehicle device 100 is connected to the in-vehicle device 100. When power is supplied to the portable device 10, power is also supplied to the portable device 10 via the power supply terminal.

  The in-vehicle device 100 includes a display unit 131, an operation unit 132, a GPS information reception unit 133, a radio reception unit 134, a CD reproduction unit 135, an audio adjustment unit 136, a memory 137, a microphone 138, an external audio / video input unit 139, and a control unit. 140 and a connector 150 are provided. When the engine key is at the Acc or IG position, the in-vehicle device 100 operates by being supplied with electric power from the battery on the vehicle side.

  Details of the functions of the respective units will be described below. The display unit 131 includes a liquid crystal panel and a backlight, and displays a received broadcast frequency, a reproduction music track number, a reproduction music name, and the like by 13-segment display. The operation unit 132 is for performing an operation for switching the operation mode of the in-vehicle device 100 and an operation in the switched various modes. As shown in FIG. 6, the operation unit 132 includes a tilt / eject button 132a, a function (hereinafter referred to as FUNC) / AF button 132b, a TEXT button 132c, a SCREEN button 132d, a SOURCE / PWR button 132e, a MODE button 132f, A button group including a MUTE button 132g, a BAND switching button 132h, a rotary button 132i, and a cross key / enter key button 132j is provided.

  Here, switching of the display between the portable device 10 and the in-vehicle device 100 by operating the button group will be described. First, the in-vehicle device 100 is turned on by pressing the SOURCE / PWR button 132e of the in-vehicle device 100. Further, when the in-vehicle device 100 is turned on, a source such as CD playback or radio is shifted by pressing the SOURCE / PWR button 132e for a short time. At this time, information on the selected source is displayed on the display unit 131 of the in-vehicle device 100, and a navigation image is displayed on the display unit 11 of the portable device 10 regardless of the source. Next, when the SCREEN button 132d is pressed, the display on the display unit 11 of the portable device 10 can be switched from the navigation image to an image corresponding to the source selected by the in-vehicle device 100.

  FIG. 7A shows a state in which the portable device 10 is mounted while the in-vehicle device 100 is playing a CD, and the navigation image is displayed on the portable device 10. When the SOURCE / PWR button 132e is pressed from the state of FIG. 7A to switch from CD playback to a radio source, information on the radio source is displayed on the display unit 131 as shown in FIG. 7B. Is displayed. In addition, the navigation image remains displayed on the display unit 11 of the portable device 10. Next, when the user presses the SCREEN button 132d, an image corresponding to the source being processed by the in-vehicle device 100 is displayed on the display unit 11 of the portable device 10 as shown in FIG. (C) Radio image). The display unit 11 of the portable device 10 is provided with a touch panel, which will be described later, and the user operates the source currently being processed by selecting an operation button displayed on the display unit 11 via the touch panel. Can do.

  Further, when the SCREEN button 132d is pressed while the radio image is displayed on the display unit 11, the radio image can be returned to the navigation image as shown in FIG. 7D. When the portable device 10 is detached from the in-vehicle device 100, the operation of the SCREEN button 132d is invalid. Further, when a USB (Universal Serial Bus) or the like is connected to the external audio / video input unit 139 while the portable device 10 is detached from the in-vehicle device 100, the SOURCE / PWR button 132e can be pressed. It is also possible not to switch to the USB source.

  Returning to FIG. 5, the GPS information receiving unit 133 includes a GPS antenna and a tuner unit, and receives a GPS signal from a satellite. The GPS signal received by the GPS information receiving unit 133 is output to the navigation unit 19 of the portable device 10 via the control unit 140, the connector 150, the connector 30, and the control unit 20, and the portable device 10 is stored based on the GPS signal. The position of the vehicle on which the in-vehicle device 100 is mounted is determined. Note that the GPS signal received by the GPS information receiving unit 133 may be output to the navigation unit of the portable device 10 via the control unit 20 instead of via the control unit 140. Further, the GPS information receiving unit 133 is configured only by a GPS antenna, and a GPS signal received by the GPS antenna is output to a tuner of the GPS information receiving unit 13 described later without passing through the control unit 140 and the control unit 20. Also good. Further, although the control unit 20 is interposed, the output may be made to the tuner of the GPS information receiving unit 13 without the control unit 140. Thus, it can be changed as appropriate.

  The radio receiving unit 134 includes an antenna and a tuner unit. The radio receiving unit 134 receives broadcast waves such as AM broadcast, FM broadcast, and multiplex broadcast, outputs audio signals, receives multiplex data, and demodulates signals. Is output to the control unit 140. The CD playback unit 135 plays back the data recorded on the CD and outputs a playback signal to the control unit 140. Note that the demodulated signal output from the radio receiving unit 134 may be output to the audio adjusting unit 136 described later without going through the control unit 140.

  The audio adjustment unit 136 performs signal processing such as volume adjustment and sound quality adjustment on the audio signal received and demodulated by the radio reception unit 134 and the audio signal reproduced by the CD reproduction unit 135 and outputs the result to the speaker 145. The memory 137 can be composed of a RAM (Random Access Memory) capable of reading and writing data, and information necessary for control (for example, FIG. 11A and FIG. 11B described later) And information on the current tilt angle of the front face 120) are temporarily stored. The microphone 138 is for making a hands-free call, and captures the voice of the user in the passenger compartment. The external audio / video input unit 139 (mounting unit) includes a connection terminal with an external device such as a USB memory or a portable audio device, inputs audio signals and data from the external device, and sends them to the control unit 140. The control signal from the control unit 140, an audio signal, data, and the like are output to the connected external device.

  The control unit 140 controls the radio reception unit 134, the CD playback unit 135, the audio adjustment unit 136, and the like according to the operation of the operation unit 132. Further, the control unit 140 outputs various signals to the portable device 10 via the connector 150 and controls the in-vehicle device 100 based on the various signals input from the portable device 10. For example, the control unit 140 outputs a GPS signal received by the GPS information receiving unit 133 and an audio signal input by the microphone 138 to the portable device 10 via the connector 150. Further, the control unit 140 inputs a call voice from a mobile phone connected to the portable device 10 via the connector 150 and outputs it to the speaker 145 via the voice adjustment unit 136. Further, the control unit 140 acquires operation signals for menu images in various modes displayed on the display unit 11 of the portable device 10 from the control unit 20 of the portable device 10, and controls the radio reception unit 134 and the CD playback unit 135. I do.

  In addition, the controller 140 receives power from a battery mounted on the vehicle. The control unit 140 outputs battery power to the portable device 10 when the portable device 10 is connected. The controller 140 receives a vehicle speed pulse and an illumination power signal from a vehicle connected via LAN. The control unit 140 transfers the input vehicle speed pulse to the control unit 20 of the portable device 10. In addition, the structure which a vehicle speed pulse is not input may be sufficient.

  Next, the portable device 10 will be described. The portable device 10 includes a display unit 11, an operation unit 12, a GPS information reception unit 13, a speaker 14, a storage battery 15, a charging circuit 16, a wireless communication transmission / reception unit 17, a memory 18, a navigation unit 19, a control unit 20, and a connector 30. ing.

  Details of the functions of the respective units will be described below. The display unit 11 includes a liquid crystal panel and a backlight, and includes map information generated by the navigation unit 19 and guidance route information to the destination, received broadcast frequency transferred from the in-vehicle device 100, playback music track No., playback The music name and the like can be displayed. As the display units 11 and 131, a flat panel display other than the liquid crystal panel, for example, an organic EL display panel, a plasma display panel, a cold cathode flat panel display, or the like can be used.

  The operation unit 12 includes a power button 55 (see FIG. 8A) for turning on / off the power of the touch panel and the portable device 10. For example, the touch panel is arranged on the display screen of the display unit 11. When the touch panel is touched with a finger or a dedicated pen, the touched position is detected and the presence or absence of an input operation is determined. It can be done. The power button 55 will be described later.

  The GPS information receiving unit 13 includes an antenna and a tuner unit, and receives a GPS signal from a satellite. The received GPS signal is output to the navigation unit 19, and the vehicle position is determined based on the GPS signal. The in-vehicle device 100 is also provided with the GPS information receiving unit 133. However, when the portable device 10 is attached to the in-vehicle device 100, the vehicle position is determined using the GPS signal received by the GPS information receiving unit 133. When the portable device 10 is used alone, the position of the own device is specified using the GPS signal and the vehicle speed pulse received by the GPS information receiving unit 13.

  The speaker 14 is for outputting audio information from the navigation unit 19, and outputs audio information when the portable device 10 is detached from the in-vehicle device 100, that is, when used alone.

  The storage battery 15 supplies power to each part of the portable device 10. When the portable device 10 is attached to the in-vehicle device 100, power is supplied from the vehicle battery via the power supply terminal of the connector 30, and the storage battery 15 is charged by the charging circuit 16. Further, the charging circuit 16 can charge the storage battery 15 by receiving power supply from the connection terminal via the USB slot (see FIG. 8A).

  The wireless communication transmitting / receiving unit 17 transmits / receives call voice to / from a mobile phone or acquires information used for navigation via the mobile phone. For the wireless communication transmitter / receiver 17, for example, Bluetooth, which is a wireless transmission system of 2.4 GHz band, is used.

  The memory 18 is a readable / writable RAM, for example, and temporarily stores information read for each control.

  The navigation unit 19 includes a map information storage unit that acquires and stores the map information used for navigation from an SD card or a USB memory, which will be described later, and stores the map information according to the GPS signal from the GPS information reception unit 133 or 13. Determine the current position information and create an image for navigation. The created map can be displayed on the display unit 11. Further, when the in-vehicle device 100 and the portable device 10 are connected, the vehicle speed pulse can be acquired from the vehicle, and the accuracy of the position detection of the own vehicle can be improved. The map information may be held in the portable device 10.

  The control unit 20 controls each unit of the portable device 10. Further, the control unit 20 outputs various signals to the in-vehicle device 100 via the connector 30, and controls the portable device 10 based on the various signals input from the in-vehicle device 100. For example, the control unit 20 acquires the GPS signal and the vehicle speed pulse received by the GPS information receiving unit 133 of the in-vehicle device 100 from the control unit 140 of the in-vehicle device 100 and outputs them to the navigation unit 19. Moreover, the control part 20 acquires the audio | voice signal input with the microphone 138 of the vehicle equipment 100 from the control part 140 of the vehicle equipment 100, and controls the navigation part 19 according to an audio | voice signal. That is, the navigation unit 19 can be operated hands-free. In addition, the call voice from the mobile phone connected by the wireless communication transmitting / receiving unit 17 is output to the in-vehicle device side via the connector 30 and is output from the speaker 145 of the in-vehicle device 100. In addition, an operation signal for the menu screen and the content screen displayed on the display unit 11 is output to the control unit 140 of the in-vehicle device 100 via the connector 30. The control unit 140 controls the radio reception unit 134 and the CD playback unit 135 according to the operation signal sent from the control unit 20 of the portable device 10.

  8A shows a front view, a top view, a bottom view, a left side view, and a right side view of the portable device 10, and FIG. 8B shows a rear view of the portable device 10. A power button 55 for turning on / off the portable device is provided on the top surface of the portable device 10, and an SD (Secure Digital) memory card slot 56 and a USB slot 57 are provided on the bottom surface. By inserting an SD card or USB memory storing map information into these slots, the control unit 20 reads the map information from the SD card or USB memory and outputs the map information to the navigation unit 19.

  When the portable device 10 is mounted on the in-vehicle device 100, the power source of the portable device 10 is turned on / off under the control of the in-vehicle device 100. Further, when the portable device 10 is used alone after being detached from the in-vehicle device 100, the power is operated based on the on / off operation of the power button 55.

  Furthermore, on the back side of the portable device 10, a connector 30 for making an electrical connection with the in-vehicle device 100, and an engagement portion 58 that engages with a lock mechanism (not shown) provided on the in-vehicle device 100 side. Is provided.

  FIG. 9 is an actual external view corresponding to the schematic external view of the in-vehicle device 100 and the portable device 10 shown in FIG. The same components as those in FIG. 1B are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 10A is a schematic cross-sectional view of the display portion 131. A light guide plate 212 is mounted on the printed circuit board 210, and a display panel 220 is provided on the light guide plate 212. LEDs 214 (light emitting elements) are mounted on the printed circuit board 210 on both sides of the light guide plate 212. The light emitted from the LED 214 enters the light guide plate 212 from the side surface or the back surface of the light guide plate 212 (arrow 230 in FIG. 10A). In the light guide plate 212, the light spreads over the entire surface of the light guide plate 212 while being reflected from the front, back, and side surfaces of the light guide plate 212, and is emitted mainly from the front and back of the light guide plate 212. The display panel 220 is an LCD panel, and part of the light emitted from the front surface of the light guide plate 212 passes through the display panel 220 and is emitted from the front surface of the display panel 220 (arrow 232).

  FIG. 10B is a plan view of the printed circuit board 210 on which the display unit 131 is mounted. A reflection area 216 that is silk-printed in white is provided in a part of the area 212a of the printed circuit board 210 on which the light guide plate 212 is mounted. The reflection regions 216 are arranged in the longitudinal direction of the light guide plate 212 and extend in the width direction.

  The light emitted from the back surface of the light guide plate 212 and the light emitted from the LEDs 214 between the front surface of the printed circuit board 210 and the back surface of the light guide plate 212 are reflected by the surface of the printed circuit board 210 and enter the light guide plate 212. The reflective region 216 formed on the surface of the printed circuit board 210 reflects more light than the non-reflective region 218 where no reflective region is formed. Thereby, in the region where the density of the reflection region 216 is high, the light emitted from the upper surface of the light guide plate 212 becomes stronger than the region where the density of the reflection region 216 is low.

  When the reflection region 216 is not provided, the luminance of the light guide plate 212 viewed from the front of the region near the LED 214 is high, but the luminance viewed from the front of the region far from the LED 214 tends to be low. As described above, a luminance distribution is generated in the light guide plate 212. Therefore, as shown in FIG. 10B, silk printing is performed so that the density of the reflective region 216 increases as the distance from the LED 214 increases. Thereby, the luminance distribution of the light guide plate 212 can be reduced.

  In order to increase the density of the reflective region 216, the width L of the reflective region 216 may be the same and the width S of the non-reflective region 218 may be narrowed. The width L may be increased. Further, the width L of the reflective region 216 may be increased and the width S of the non-reflective region 218 may be decreased.

  The reflective region 216 is preferably formed by silk printing directly on the printed circuit board 210. Thereby, the reflective region 216 can be formed at the same time when characters or the like are silk-printed on the surface of the printed circuit board 210. Furthermore, since the arrangement of the reflection region 216 can be set flexibly, even if the mounting position of the LED 214 is changed after the light guide plate 212 is formed, the reflection region 216 can be arranged by changing the silk printing pattern. Can be changed. The reflection region 216 may be any color that easily reflects light, and may be yellow or the like in addition to white. The reflective region 216 can also be formed by wiring of the printed circuit board 210. In addition, the reflective region 216 is not limited to silk printing, and may be a paint or a seal with a highly reflective coating material.

  The arrangement of the LEDs 214 can be set as appropriate, but is preferably provided on the side of the short side of the light guide plate 212. A point light source such as the LED 214 changes in luminance concentrically from the light source. Therefore, by arranging the LED 214 on the side near the center of the short side of the light guide plate 212, the light incident on the light guide plate 212 becomes more uniform. Moreover, although the shape and arrangement | positioning of the reflective area | region 216 can be set suitably, it is preferable that the reflective area | region 216 is arranged in the longitudinal direction of the light-guide plate 212, and is extended in the width direction. When close to a point light source, the luminance varies depending on the distance from the light source. Therefore, by setting the reflection region 216 in the width direction of the light guide plate 212, the luminance viewed from the front can be adjusted by the width of the light guide plate 212. This facilitates adjustment of the luminance viewed from the front.

  FIG. 11A is a schematic cross-sectional view of a light emitting device for illuminating the rotary button 132i. An LED 214, a light guide plate 213, and a rotary button 132i are mounted on the printed circuit board 210. The rotary button 132 i includes a button main body portion 250 and a switch portion 252 that is pressed by the button main body portion 250. A light guide plate 213 having an annular shape when viewed from the front is provided on the LED 214. The light emitted from the LED 214 enters the light guide plate 213 mainly from the back surface of the light guide plate 213. Light (arrow 242) emitted from the front surface of the light guide plate 213 passes through the button main body 250 of the rotary button 132i and is emitted to the front surface.

  FIG. 11B is a plan view of the printed circuit board 210. A reflection area 216 that is silk-printed in white is provided on a part of the area 213a of the printed circuit board 210 on which the light guide plate 213 is mounted. The density of the reflective region 216 increases as the distance from the LED 214 increases. Thereby, as described in the display unit 131, the luminance distribution of the light guide plate 213 can be suppressed.

  Although the example of LED was shown as a light emitting element, a fluorescent tube etc. may be sufficient as a light emitting element. However, since the LED is small, if the LED is used as a light emitting element, the luminance distribution of the waveguide plate is likely to occur. Therefore, when the light emitting element is an LED, it is particularly effective to provide a reflective region on the printed board. Furthermore, since the LED is small, the arrangement on the printed board can be easily changed. As described above, by using the LED as the light emitting element and providing the reflective region on the printed board by silk printing, the arrangement on the printed board can be easily changed and the luminance distribution of the waveguide can be suppressed.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims.・ Change is possible.

1A and 1B are schematic diagrams illustrating an appearance of an in-vehicle system according to the first embodiment. FIG. 2 is a schematic diagram showing a state in which the portable device is detached from the in-vehicle device. FIG. 3 is a schematic diagram showing a state in which the front surface portion is inclined with respect to the in-vehicle device main body and the CD insertion / extraction opening is exposed. FIG. 4 is a schematic diagram showing an example of mounting an in-vehicle system on a vehicle. FIG. 5 is a block diagram showing a schematic configuration of the in-vehicle system. FIG. 6 is a schematic front view of the main body. FIGS. 7A to 7D are schematic views showing display of a portable device attached to the main body. FIG. 8A is a front schematic diagram, a top schematic diagram, a bottom schematic diagram, a left side schematic diagram, and a right side schematic diagram of a portable device, and FIG. 8B is a rear schematic diagram of the portable device. FIG. 9 is a diagram illustrating an appearance of the in-vehicle system according to the first embodiment. FIG. 10A and FIG. 10B are diagrams showing a display portion. FIG. 11A and FIG. 11B are diagrams illustrating a light-emitting device for illuminating a rotary button.

Explanation of symbols

210 Printed circuit board 212, 213 Light guide plate 214 LED
216 Reflective area 218 Non-reflective area 220 Display panel 250 Button body 252 Switch part

Claims (6)

A printed circuit board,
A light guide plate mounted on the printed circuit board and emitting light to the front;
A light emitting element mounted on the printed circuit board and emitting light to the light guide plate;
A plurality of reflective areas silk-printed and provided in a part of the area of the printed board on which the light guide plate is mounted;
The light-emitting device, wherein the density of the reflection region increases with distance from the light-emitting element. The shape seen from the front of the light guide plate is a rectangle,
The light emitting element portion is provided on the side of the short side of the light guide plate,
The light emitting device according to claim 1, wherein the plurality of reflection regions are arranged in a longitudinal direction of the light guide plate and extend in a width direction of the light guide plate.   The light-emitting device according to claim 1, wherein the light guide plate has a ring shape when viewed from the front.   The light emitting device according to any one of claims 1 to 3, wherein the light emitting element is an LED. A display panel;
A printed circuit board,
A light guide plate mounted on the printed circuit board and emitting light to the display panel;
A light emitting element mounted on the printed circuit board and emitting light to the light guide plate;
A plurality of reflective areas silk-printed and provided in a part of the area of the printed board on which the light guide plate is mounted;
The display device, wherein the density of the reflection region increases with distance from the light emitting element. Button body,
A printed circuit board on which a switch portion pressed by the button body portion is mounted;
A light guide plate mounted on the printed circuit board and emitting light to the button body,
A light emitting element mounted on the printed circuit board and emitting light to the light guide plate;
A plurality of reflective areas silk-printed and provided in a part of the area of the printed board on which the light guide plate is mounted;
The button device according to claim 1, wherein the density of the reflection region increases with distance from the light emitting element.

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