JP4807079B2 - Instrument device - Google Patents

Description

  The present invention relates to an instrument device, and is characterized by fixing a circuit board that forms an electric circuit portion of the instrument device.

  2. Description of the Related Art Conventionally, there is a vehicle instrument device that fixes a circuit board that forms an electric circuit portion of a meter device to a case without using a fixing screw. The case is divided into an upper case and a lower case, which sandwich the circuit board from its both plate surface sides at the outer periphery thereof, and fix the circuit board to these. The upper case and the lower case are fixed by hooking at the outer peripheral portions thereof, thereby fixing the circuit board to the case.

  However, in this circuit board, the center side is more susceptible to vibration than the outer periphery, and there is a risk of generating abnormal noise due to vehicle vibration or the like.

  In order to solve this problem, an instrument device is disclosed in which a pin formed on the lower case is configured to always press the circuit board toward the upper case side at the center side from the outer periphery (see Patent Document 1).

In this configuration, since the pins are formed longer, the lower case is bent and elastically deformed, and the pins always press the circuit board toward the upper case side using this elastic force. Thereby, it is intended to prevent the central portion of the circuit board from vibrating due to vehicle vibration or the like.
JP-A-11-72359

  In Patent Document 1, the holding amount of the circuit board by the pin varies as it becomes smaller or larger depending on the tolerance of the holding amount by the upper case and the lower case on the outer periphery of the circuit board. However, since the deflection of the lower case itself is generally small, it is difficult to secure the margin for holding the circuit board by the pins by the deflection of the lower case itself.

  For this reason, for example, when the pressing margin by this pin is small, the effect of preventing the center side of the circuit board from vibrating is reduced, and conversely, when this pressing margin is large, the assembly of the circuit board is deteriorated. For this reason, it is necessary to tune the pin length many times.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an instrument device that can easily and reliably fix a circuit board to a case and is hardly affected by vibration.

  In order to achieve the above object, the present invention employs the following technical means.

The instrument device according to claim 1 includes a circuit board that forms an electric circuit portion of the instrument apparatus, a first case and a second case that are fixed by sandwiching the circuit board from both sides of the circuit board, and a first case. and it is formed integrally with a plurality of elastic portion is elastically deformed with respect to the first case to the direction of pressing the one plate surface of the circuit board, and a plurality of supporting portion fixed to the second case, a plurality of The elastic portion is formed so as to press one plate surface at a portion not sandwiched between the first case and the second case in a state where the circuit board is sandwiched and fixed between the first case and the second case. The plurality of support portions are in contact with the other plate surface of the circuit board at positions facing each of the plurality of elastic portions in a state where the circuit board is sandwiched and fixed between the first case and the second case. It is set as the structure formed in .

In this configuration, a plurality of elastic portions that elastically deform with respect to the first case in a direction of pressing one plate surface of the circuit board are provided, and the plurality of elastic portions are sandwiched between the first case and the second case. In this state, it is formed so as to press one of the plate surfaces.

  Thereby, even if the holding allowance of the circuit board by the elastic portion varies due to the tolerance of the holding allowance of the circuit board by the first case and the second case, the holding allowance of the circuit board by the elastic portion is changed. It can be ensured by elastic deformation of the first case. That is, since the elastic portion is configured to be elastically deformed with respect to the first case, it is possible to ensure the amount of elastic deformation necessary for ensuring the holding amount of the circuit board by the elastic portion. For this reason, a circuit board can be fixed to a case simply and reliably, and the instrument apparatus which is hard to receive to the influence of a vibration can be provided.

In addition, in this configuration, since a plurality of support portions abutting each and the other plate surface of the circuit board at a position where the pair toward the plurality of elastic parts, that the circuit board is deformed by being pressed by an elastic section It can be regulated appropriately. Thereby, the above-mentioned effect can be acquired more reliably.

The instrument device according to claim 2 is configured such that the first case and the second case are fixed so as to sandwich the circuit board at the outer periphery of the circuit board, and the elastic portion has a part of the outer periphery on one plate surface. It is set as the structure currently formed so that at least one of the center side may be pressed from outer periphery.

  In this configuration, the first case and the second case sandwich and fix the circuit board at the outer periphery of the circuit board, and the elastic part is at least one of the outer periphery and at least one of the outer periphery on the center side of the circuit board. It is formed so as to press. When the elastic part is formed so as to press the center side from the outer periphery, the circuit board can be secured on the center side from the outer periphery and the outer periphery because the holding amount of the circuit board by the elastic part can be secured by elastic deformation of the elastic part. In this case, it can be easily and securely fixed to the case. As a result, an instrument device that is less susceptible to vibrations can be provided.

  In addition, when the elastic part is formed so as to press a part of the outer periphery, the circuit board can be secured to the case on the outer periphery because the elastic substrate can secure the holding allowance of the circuit board by the elastic part. Can be fixed easily and more reliably. As a result, an instrument device that is less susceptible to vibrations can be provided.

The instrument device according to claim 3 , wherein the elastic portion is formed so as to be elastically deformed in a pressing direction, and the pressure is formed on the arm portion and presses one plate surface by elastic deformation of the arm portion. And at least one end of each end of the arm portion is fixed to the first case.

  In this configuration, since the elastic portion uses the elastic deformation of the arm portion, the above-described effects can be obtained with a simple configuration.

The instrument device according to claim 4 is configured such that the pressing portion is formed in a rod shape so as to extend in a direction of pressing from the arm portion.

  In this configuration, the pressing portion is formed in a rod shape so as to extend in the pressing direction from the arm portion. Thereby, it becomes possible to form an arm part in the position away from the circuit board, and the above-mentioned effect can be acquired, obtaining the freedom degree in design.

The instrument device according to claim 5 is configured such that the pressing portion includes a protrusion at the tip of the pressing portion that presses one plate surface by elastic deformation of the arm portion.

  In this configuration, the pressing portion includes a protruding portion that presses one plate surface by elastic deformation of the arm portion at the tip of the pressing portion. Thereby, the position which presses a circuit board can be determined reliably, and it can fix to a case simply and reliably in a more suitable position. As a result, an instrument device that is less susceptible to vibrations can be provided.

The instrument device according to claim 6 is configured such that the first case includes a plate portion, and the arm portion is formed by providing a gap or an opening in the plate portion.

  In this configuration, since the arm portion is formed by providing a gap or an opening in the plate portion of the first case, the above-described effects can be obtained with a simpler configuration.

  Hereinafter, an example in which the pointer instrument according to the present invention is applied to a combination meter 1 mounted on an automobile will be described with reference to the drawings.

(Constitution)
FIG. 1 is a front view of a combination meter 1 which is an instrument device according to an embodiment of the present invention.

  2 is a cross-sectional view taken along the line II-II in FIG.

  FIG. 3 is a plan view of the lower case 8, which is the first case in FIG.

  FIG. 4 is an enlarged perspective view of a portion IV in FIG.

  FIG. 5 is a rear view of the combination meter 1 which is an instrument device according to an embodiment of the present invention.

  FIG. 6 is an enlarged perspective view of a portion VI in FIG.

  FIG. 7 is a circuit configuration diagram illustrating an electrical circuit configuration of the combination meter 1 according to one embodiment of the present invention.

  A combination meter 1 that is an instrument device is arranged in front of a driver's seat of an automobile and displays various information related to the automobile. As shown in FIG. 1, the combination meter 1 according to the present embodiment includes a speed display unit 2 that displays the traveling speed of the automobile, a warning indicator display unit 3 that displays various warning information and indicator information, And an odd trip display unit 4 for displaying trip information.

  The speed display unit 2 includes a dial 21 in which letters (including numerals), scales, and backgrounds thereof are formed on a translucent resin plate such as polycarbonate resin, and a front side on the viewing side of the dial 21 (upper side in FIG. 2). And a pointer 22 that rotates along the surface. A decorative ring 23 that forms an outer frame of the speed display unit 2 is provided on the front side of the dial 21 on the viewing side.

  Behind the dial 21 (lower side in FIG. 2) are a movement 22a, light emitting diodes 24 and 31, a light guide 5, a printed circuit board 6 as a circuit board, and an upper case 7 as a second case. Is done. The printed circuit board 6 forms an electric circuit part of the combination meter 1, and the movement 22 a and the light emitting diodes 24 and 31 are mounted on the printed circuit board 6.

  The movement 22a is composed of, for example, a cross coil actuator or a stepping motor, and rotates the pointer 22 by an angle corresponding to an external electric signal (vehicle speed signal in the present embodiment).

  The light guide unit 5 is formed of a light-transmitting resin such as acrylic resin, guides the light from the light emitting diode 24 to the dial 21 and the pointer 22, illuminates the dial 21, and causes the pointer 22 to emit light. It is.

  The odd trip display unit 4 includes a liquid crystal panel disposed in the opening of the dial 21 and a light emitting diode (not shown) disposed behind and illuminating the liquid crystal panel. The od trip display unit 4 includes any one of an odometer indicating an accumulated distance (displaying the cumulative travel distance of the vehicle), a trip meter A indicating a section distance, and a trip meter B indicating a section distance different from the trip meter A. Is displayed.

  The changeover switch 42 performs this changeover, and the operation knob 41 operates the changeover switch 42.

  The warning indicator display unit 3 includes a plurality of warnings and a plurality of indicators. For example, it includes a seat bell warning that warns that a seat belt (not shown) is not attached, an ABS warning that informs the abnormality of an ABS (anti-lock brake system), and a fog lamp indicator that instructs the fog lamp to turn on.

  Each warning or each indicator (hereinafter referred to as each warning) of the warning indicator display unit 3 is a mark indicating information on the warning formed on the dial 21 (translucent resin plate), and behind it (in FIG. 2). And a light emitting diode 31 disposed on the lower side. In each warning, the light emitting diode 31 is turned on to cause the mark to emit light and display the warning information indicated by the mark to the driver.

  The upper case 7 includes a light leakage prevention unit 70 that prevents each light emitting diode 31 from leaking light to a warning mark adjacent thereto and causing it to emit light.

  The outer periphery of the printed circuit board 6 is fixed to the upper case 7 and the lower case 8 which is the first case shown in FIG. The upper case 7 and the lower case 8 are fixed to each other by hooking.

  Specifically, as shown in FIGS. 3, 5, and 6, six hooking portions 72 are formed on the outer periphery of the upper case 7, and the hooked portion 84 on which the hooking portion 72 is hooked is used as a lower case. The upper case 7 and the lower case 8 are fixed to each other by forming six pieces on the outer periphery of the plate 8 and hooking the hook portions 72 on the hook portions 84. However, the number of the hooking portions 72 and the hooked portions 84 is not limited to six, and the fixing of the upper case 7 and the lower case 8 is not limited to hooking.

  The lower case 8 is made of acrylonitrile / butadiene / styrene (ABS) resin having elasticity. The lower case 8 is formed with an elastic portion 80 that presses one plate surface (the lower surface in FIG. 2) of the printed circuit board 6.

  The elastic portion 80 is in a state where the printed circuit board 6 is sandwiched and fixed between the upper case 7 and the lower case 8 and the printed circuit board 6 is not sandwiched between the upper case 7 and the lower case 8. 2, the lower surface) is pressed. As shown in FIG. 3, the elastic portion 80 is formed in the plate portion 83 of the lower case 8 on the center side with respect to the outer peripheral portion 85 and on the outer side of the recessed end portion of the outer peripheral portion 85.

  The elastic part 80 on the center side includes an arm part 82 and a pressing part 81 as shown in FIG.

  The arm portion 82 is formed by providing a gap 82 a in the plate portion 83 of the lower case 8, and both ends of the arm portion 82 are integrated with the plate portion 83 of the lower case 8. Since the arm portion 82 is fixed to the plate portion 83 of the lower case 8 only at both ends of the arm portion 82, the arm portion 82 is elastically deformed in the direction in which the printed board 6 is pressed against the plate portion 83 (upward in FIG. 4). It becomes possible. For this reason, it is possible to secure a necessary elastic deformation amount described later.

  The pressing portion 81 is formed in a rod shape so as to extend in the pressing direction from the arm portion 82, and includes a protruding portion 81 a that presses one plate surface by elastic deformation of the arm portion 82 at the tip. The pressing portion 81 is reinforced and integrated with respect to the arm portion 82 by the reinforcing portion 81b. Thus, the pressing portion 81 presses one plate surface (the lower surface in FIG. 2) of the printed circuit board 6 by elastic deformation of the plate portion 83 in the pressing direction of the arm portion 82.

  Since the elastic part 80 is configured as described above, the elastic part 80 can be formed at the same time when the lower case 8 is formed by resin molding.

  As described above, the upper case 7 and the lower case 8 are formed so that the printed circuit board 6 is sandwiched and fixed on the outer periphery thereof, and the elastic portion 80 is formed so as to press the center side from the outer periphery on one plate surface of the printed circuit board 6. . Thereby, the press margin of the printed circuit board 6 by the elastic part 80 can be ensured by the elastic deformation of the elastic part 80 in the vertical direction in FIG. That is, since the elastic portion 80 is configured to be elastically deformed with respect to the lower case 8, it is possible to secure an elastic deformation amount necessary for securing a pressing margin of the printed circuit board 6 by the elastic portion 8.

  As a result, the pressing margin of the printed circuit board 6 by the elastic portion 80 can be secured without being affected by the tolerance of the pressing margin by the upper case 7 and the lower case 8 on the outer periphery of the printed circuit board 6.

  For this reason, the printed circuit board 6 can be easily and reliably fixed to the cases 7 and 8 on both the outer periphery and the center side from the outer periphery. Thereby, the combination meter 1 which is hard to receive the influence of a vibration can be provided.

  Moreover, since the elastic part 80 utilizes the elastic deformation of the arm part 82, it can press one board surface of the printed circuit board 6 with a simple structure.

  Further, the pressing portion 81 is formed in a rod shape so as to extend in the pressing direction from the arm portion 82. Thereby, it becomes possible to form the arm part 82 in the position away from the printed circuit board 6, and the above-mentioned effect can be acquired, obtaining the freedom degree in design.

  Further, the pressing portion 81 includes a protruding portion 81 a that presses one plate surface of the printed circuit board 6 by elastic deformation of the arm portion 82 at the tip thereof. Thereby, the position which presses the printed circuit board 6 can be determined reliably, and the printed circuit board 6 can be simply and reliably fixed to the cases 7 and 8 at a more appropriate position.

  On the other hand, a part of the above-described light leakage prevention unit 70 is used as a support unit 71 that comes into contact with the other plate surface (the upper surface in FIG. 2) of the printed circuit board 6. The support portion 71 is formed so as to come into contact with the other plate surface of the printed circuit board 6 at a position substantially opposed to the elastic portion 80 in a state where the printed circuit board 6 is fixed between the upper case 7 and the lower case 8. The

  In FIG. 2, the right support portion 71 is formed so as to contact the other plate surface of the printed circuit board 6 at a position facing the elastic portion 80, but the left support portion 71 in FIG. Is formed so as to contact the other plate surface of the printed circuit board 6 at a position slightly deviated from the position opposed to the printed circuit board 6.

  The support part 71 appropriately restricts the printed circuit board 6 from being deformed by being pressed by the elastic part 80. Thereby, the printed circuit board 6 can be fixed to the cases 7 and 8 simply and more reliably, and the combination meter 1 which is less susceptible to vibration can be provided.

  In addition, it is also possible to adopt a configuration in which a part of the light leakage prevention part 70 is not used as the support part 71 but the support part 71 is newly provided.

  3, the outer elastic portion 80 is formed so as to press one part of the outer periphery on one plate surface (the lower surface in FIG. 6) of the printed circuit board 6 as shown in FIGS. 5 and 6. Is done.

  Specifically, a part of the outer periphery of the printed circuit board 6 (two places in FIG. 5) is configured not to be sandwiched between the upper case 7 and the lower case 8, and the elastic portion 80 is formed at this part. The elastic part 80 includes an arm part 82 and a pressing part 81, and one end of the arm part 82 is fixed to the side part of the lower case 8. The arm portion 82 is formed so as to be elastically deformed in the direction in which the printed circuit board 6 is pressed (the vertical direction in FIG. 6), and the pressing portion 81 is formed on the arm portion 82. The pressing portion 81 presses one plate surface of the printed circuit board 6 by elastic deformation in the pressing direction of the arm portion 82.

  Since the press margin of the printed circuit board 6 by the elastic part 80 can be ensured by elastic deformation of the elastic part 80 with respect to the lower case 8, the printed circuit board 6 can be secured by holding the cases 7 and 8 around the outer periphery and pressing the elastic part 80. Can be fixed easily and more reliably. Thereby, the combination meter 1 which is hard to receive the influence of a vibration can be provided.

  In the above example, in FIG. 3, the portion where the printed board 6 is sandwiched between the upper case 7 and the lower case 8 is the outer peripheral portion 85, and the portion where the printed board 6 is not sandwiched between the upper case 7 and the lower case 8 is They are the center side of the outer peripheral portion 85 and the outer side of the recessed end portion of the outer peripheral portion 85. Two elastic portions 80 are provided on each of the inner side of the outer peripheral portion 85 and the outer side of the recessed end portion of the outer peripheral portion 85.

  A design plate 9 that covers the end of the dial 21 is attached to the front side of the dial 21 (upper side in FIG. 2), and a transparent cover 10 is attached to the tip side of the design plate 9 (upper side in FIG. 2). .

  The electric circuit configuration of the combination meter 1 according to the present embodiment described above will be described with reference to FIG.

  The control device 11 composed of a microcomputer or the like is always supplied with electric power from the battery 14, and the ignition switch 13 is connected so as to be able to detect its operation position (off position, on position), and detects the traveling speed of the vehicle. A vehicle speed sensor 12 and a sensor, a switch, and the like (not shown) are connected so that these signals can be input.

  In addition, the movement 22 a, the light emitting diodes 24 and 31, the liquid crystal panel of the odd trip display unit 4, and the changeover switch 42 driven by the control device 11 according to the detection signal from the vehicle speed sensor 12 are also connected to the control device 11. .

(Operation)
The operation of the combination meter 1 configured as described above according to an embodiment of the present invention will be described.

  When the ignition switch 13 is turned on, in FIG. 7, the control device 11 detects it and starts operation. That is, based on the output signal from the speed sensor 12, the vehicle speed of the vehicle is calculated, and the movement 22a is driven so as to rotate the pointer 22 by an angle corresponding thereto.

  In addition, the control device 11 turns on the light emitting diode 24, and the pointer 22 is lit and displayed through the light guide unit 5, and the dial 21 is transmitted and illuminated.

  Moreover, the control apparatus 11 lights up the light emitting diode 31 arrange | positioned behind the required warning, and displays this warning.

  In addition, the control device 11 operates the liquid crystal panel in accordance with a signal from the changeover switch 42 and the like, and displays od trip information on the liquid crystal panel.

  The combination meter 1 that is the instrument device according to the embodiment of the present invention described above includes the printed circuit board 6 that is a circuit board that forms the electric circuit portion of the combination meter 1, and the printed circuit board 6 on both sides of the printed circuit board 6. A lower case 8 serving as a first case and an upper case 7 serving as a second case, and an elastic portion 80 that is elastically deformed with respect to the lower case 8 in a direction in which one plate surface of the printed circuit board 6 is pressed. The elastic portion 80 is formed so as to press one plate surface at a portion not sandwiched between the lower case 8 and the upper case 7 in a state where the printed circuit board 6 is sandwiched and fixed between the lower case 8 and the upper case 7. Has been.

  Thereby, a circuit board can be fixed to a case simply and reliably, and the instrument apparatus which is hard to receive to the influence of a vibration can be provided.

  FIG. 8 is an enlarged perspective view showing a modification of FIG.

  The elastic part 80 shown in FIG. 4 can be formed as shown in FIG. The elastic part 80 shown in FIG. 8A is formed so that the arm part 82 is curved in a wave shape so that it is more easily elastically deformed. The elastic part 80 shown in FIG. Only one end of 82 is fixed to the plate portion 83 of the lower case 8 so as to be easily elastically deformed. Further, the elastic portion 80 shown in FIG. 8C is obtained by forming an arm portion 82 by providing an opening 82b instead of the gap 82a.

  In the above example, the elastic portion 80 is formed in the lower case 8, but it can also be formed in the upper case 7. In this case, the support portion 71 is formed on the lower case 8.

  Further, the above-described effects can be obtained without providing the support portion 71.

  In the above-described example, two elastic portions 80 are provided on each of the center side from the outer peripheral portion 85 and the outer side of the recessed end portion of the outer peripheral portion 85. However, one or three or more elastic portions 80 are provided on each. Is also possible.

  In the above example, the portion where the printed circuit board 6 is sandwiched between the upper case 7 and the lower case 8 need not be limited to the position of the outer peripheral portion 85 shown in FIG. It is.

  Moreover, not only the above-mentioned example but the combination of these and other various modifications can be considered.

FIG. 1 is a front view of a combination meter 1 which is an instrument device according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a plan view of the lower case 8, which is the first case in FIG. FIG. 4 is an enlarged perspective view of a portion IV in FIG. FIG. 5 is a rear view of the combination meter 1 which is an instrument device according to an embodiment of the present invention. FIG. 6 is an enlarged perspective view of a portion VI in FIG. FIG. 7 is a circuit configuration diagram illustrating an electrical circuit configuration of the combination meter 1 according to one embodiment of the present invention. FIG. 8 is an enlarged perspective view showing a modification of FIG.

Explanation of symbols

1 Combination meter (instrument equipment)
2 Speed display section, 21 Dial, 22 Pointer, 22a Movement 23 Decoration ring, 24, 31 Light emitting diode 3 Warning indicator display section 4 Odo trip display section, 41 Operation knob, 42 Changeover switch 5 Light guide section, 6 Printed circuit board (circuit board)
7 Upper case (second case), 70 Light leakage prevention part, 71 Support part, 72 Hook part 8 Lower case (first case), 80 Elastic part, 81 Press part, 81a Projection part 81b Reinforcement part, 82 Arm part, 82a Clearance, 82b Opening 83 Plate part, 84 Covered part, 85 Outer peripheral part 9 Design board, 10 Transparent cover 11 Control device, 12 Vehicle speed sensor, 13 Ignition switch, 14 Battery

Claims (6)

A circuit board forming an electric circuit part of the instrument device;
A first case and a second case for fixing the circuit board by sandwiching the circuit board from both sides of the circuit board;
A plurality of elastic portions formed integrally with the first case and elastically deformed with respect to the first case in a direction of pressing one plate surface of the circuit board ;
A plurality of support portions fixed to the second case ;
The plurality of elastic portions may be configured such that the one of the circuit boards is not sandwiched between the first case and the second case in a state where the circuit board is sandwiched and fixed between the first case and the second case. Formed to press the plate surface ,
The plurality of support portions are arranged on the other plate surface of the circuit board at positions facing each of the plurality of elastic portions in a state where the circuit board is sandwiched and fixed between the first case and the second case. It is formed so that it may contact | abut . The first case and the second case are configured so as to sandwich and fix the circuit board at an outer periphery of the circuit board,
2. The instrument device according to claim 1, wherein the elastic portion is formed so as to press a part of the outer periphery and at least one of a central side from the outer periphery on the one plate surface . The elastic part includes an arm part formed to be elastically deformed in the pressing direction, and a pressing part that is formed on the arm part and presses the one plate surface by elastic deformation of the arm part,
The instrument device according to claim 1, wherein at least one end of both ends of the arm portion is fixed to the first case . The instrument device according to claim 3, wherein the pressing portion is formed in a bar shape so as to extend from the arm portion in the pressing direction . The pressing unit, the meter device according to claim 4, characterized in Rukoto provided at the tip of the pressing portion of the projecting portion for pressing the one plate surface by the elastic deformation of the arm portion. The first case includes a plate portion,
The arm portion to claims 3, characterized that you have been formed by providing a gap or opening in the plate portion meter device according to any one of claims 5.

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