JP3769920B2 - Display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device such as a vehicle pointer device and other display devices used in various fields.
[0002]
[Prior art]
Conventionally, as an example of this type of display device, a speedometer shown in FIG. 3 has been proposed, and this speedometer is attached to an instrument panel in a vehicle cabin.
The speedometer includes a translucent dial plate 10, and a scale region 11 is formed in an annular and circular arc shape on the outer peripheral portion of the dial plate 10 as shown in FIG. The scale area 11 displays the scale by transmitting the light emitted from the light guide plate 20 described later.
[0003]
Further, the speedometer includes a light guide plate 20 made of a transparent light guide resin material such as an acrylic resin material. The light guide plate 20 introduces light of both lamps L, which will be described later, into the dial plate 10. The light is incident from the back side or condensed on the pointer 90.
A liquid crystal panel 30 that displays the travel distance of the vehicle as an odometer is mounted in a recess 21 formed in the front side portion of the light guide plate 20 shown in FIG. 3, and a plurality of terminals 31 of the liquid crystal panel 30 are provided. The light guide plate 20 extends downward along the extended plate portion 22, and extends downward through the lower part of the U-shaped protruding wall 22 a of the extended plate portion 22. The extension plate portion 22 extends downward from the front side end portion of the recess 21 shown in FIG.
[0004]
In addition, the light guide plate 20 includes a cylindrical body 20a for assembling a nulling adjustment knob 40 (hereinafter referred to as nulling knob 40) for displaying a travel distance as an odometer.
The cylindrical body 20a is formed so as to protrude from the right side portion of the light guide plate 20 in FIG. As shown in FIG. 3, the opening portion 23 of the cylindrical body 20 a is formed on the right side of the light guide plate 20, and the opening portion 23 is an area 12 (hereinafter referred to as a scale area 11) other than the scale area 11 on the dial 10. 3) of the scale area 11 in the vicinity of the right end portion shown in FIG.
[0005]
Further, as shown in FIG. 3, the opening portion 23 communicates with a longitudinal through hole portion 24 formed in the light guide plate 20 in the vicinity thereof at a part 23 a of the peripheral wall. The scale region 11 extends in the shape of a letter toward the lower side of the right end portion shown in FIG.
As shown in FIG. 3, the nulling knob 40 is formed of, for example, a white resin material so as to integrally include a rod 40 a and a knob 40 b.
[0006]
The rod 40a includes an annular portion 41, and the annular portion 41 is formed to project in an annular shape at an intermediate portion in the axial direction of the rod 40a. The knob 40b extends from the annular portion 41 of the rod 40a to the lower end side of the rod 40a in a crank shape.
Specifically, the knob 40b extends from a part of the outer peripheral surface of the annular portion 41 at a base portion 42 at a right angle to the axis of the rod 40a. The intermediate portion 43 of the knob 40b extends from the tip of the base portion 42 to the lower end side in parallel with the axis of the rod 40a.
[0007]
Further, the tip of the knob 40b extends as a knob 44 from the lower end of the intermediate portion 43 outward at a right angle to the axis of the rod 40a. The extending direction of the knob 44 from the intermediate portion 43 is as follows. With the intermediate portion 43 as a reference, the base portion 42 is formed in a square shape counterclockwise. Thereby, when the rod 40a is inserted into the cylindrical body 20a from the opening 23 in FIG. 3 from above, the knob 40b is inserted into the through hole 24.
[0008]
Further, the speedometer includes a circuit board 50, and a step motor 60 is mounted on the circuit board 50. Both lamps L are arranged on both sides of the circuit board 50.
In FIG. 3, reference numeral 70 denotes a coil spring into which the rod 40a is inserted, and reference numeral 80 denotes a nulling switch. The nulling switch 80 is provided on the circuit board 50 in the vicinity of the right side of the step motor 60 in FIG. 3, and the nulling switch 80 has a convex protrusion on the lower surface of the knob 40 b at its switching projection 81. It is located directly below the portion 44a.
[0009]
Based on the above configuration, the speedometer is assembled as follows.
The light guide plate 20 is supported on an appropriate support member on the circuit board 50 so as to be parallel to the light guide plate 20. At this time, each terminal 31 of the liquid crystal panel 30 is inserted and soldered into each land hole 51 of the circuit board 50.
[0010]
In the nulling knob 40, the rod 40 a is coaxially inserted from the opening 23 into the cylindrical body 20 a through the coil spring 70 and resists the elasticity of the coil spring 70 at the lower end split projection 45. The body 20a is inserted through the bottom wall annular portion 25 and is prevented from coming off.
Here, the coil spring 70 is sandwiched between the bottom wall annular portion 25 of the cylindrical body 20a and the annular portion 41 of the rod 40a, and is coaxially positioned in the cylindrical body 20a.
[0011]
In such a process, the knob 40 b is inserted into the through hole 24. The base portion 42 of the knob 40b is located in a part 23a (hereinafter referred to as the one side peripheral wall portion 23a) side portion 24a (hereinafter referred to as the opening side through hole portion 24a) of the opening portion 23 of the through hole portion 24. Engage. Further, the intermediate portion 43 of the knob 40b extends downward from the through-hole portion 24, and the knob portion 44 extends at the lower surface tip convex portion 44a directly below the longitudinal through-hole portion 24 and toward the tip thereof. It is positioned directly above the switching projection 81 of the return / zero return switch 80.
[0012]
Accordingly, when the zero return knob 40 is pushed, the knob 40b pushes the switching projection 81 of the zero return switch 80 at the knob portion 44 to turn on the zero return switch 80. Accordingly, the travel distance display on the liquid crystal panel 30 is reset.
The dial plate 10 is assembled to the circuit board 50 via the light guide plate 20. Specifically, this assembly is performed by fastening each screw 14 to each flange portion 61 of the step motor 60 through each through hole portion 13 of the dial plate 10 and each through hole portion of the light guide plate 20. The liquid crystal panel 30 is visible from the opening 16 of the dial 10.
[0013]
Further, the pointer shaft 62 of the step motor 60 extends upward through the through-hole portion 27 of the light guide plate 20 and the through-hole portion 15 of the dial plate 10, and the boss of the pointer 90 is supported at the tip portion thereof.
[0014]
[Problems to be solved by the invention]
By the way, in the speedometer having the above-described configuration, as described above, the light guide plate 20 has a through hole having a shape along the shape of the knob 40b in order to position the knob portion 44 of the nulling knob 40 in the vicinity of the nulling switch 80. A portion 24 is formed. Moreover, since the through hole 24 extends in the shape of a letter toward the lower side of the right end portion of the scale region 11 shown in FIG. 3, the through hole 24 is viewed from the front side of the dial 10. At this time, the scale region 11 is located on the lower side of the right end portion of FIG.
[0015]
For this reason, when the light from both lamps L is incident on the light guide plate 20 and diffused or transmitted through the light guide plate 20 and enters the scale region 11, the through hole 24 interferes with the incident and passes through the scale region 11. Looks like a shadow. As a result, not only the uniform brightness of the dial plate 10 cannot be obtained, but also a problem that the scale area 11 is difficult to see due to the shadow is caused.
[0016]
Therefore, in order to cope with the above, the present invention affects the display plate as a shadow by the through hole portion of the light guide plate for assembling the operation knob adopted for display switching, nulling, etc. in the display device. The purpose is to secure the uniform brightness of the display panel by devising the assembly structure of the operation knob to the light guide plate.
[0017]
[Means for Solving the Problems]
In solving the above problem, according to the invention described in claim 1, the display device
A display board (10);
A light guide plate (20A) that is provided on the back side of the display plate and introduces light from the light source (L) and enters the display plate;
And an operation knob (40) for switching at least a part of the display on the display board.
[0018]
The light guide plate is a cylindrical body that protrudes from the end portion toward the back surface side, and has an opening portion (23a) that opens to the front surface side at the end portion, and the opening portion. And a through hole portion (24a) formed from one side peripheral wall portion (23a) toward the inside of the light guide plate.
Further, the cylindrical-side notch (29) is located on the other side of the opening located on the outer side of the light guide plate with respect to the one-side peripheral wall from the one-side peripheral wall of the opening through the peripheral wall intermediate portion of the cylinder. It is formed over the peripheral wall (23b).
[0019]
The operation knob
A rod (40a) inserted into the cylinder so as to be axially movable;
A base (42) extending radially from the axially intermediate portion of the rod and inserted into the one side peripheral wall portion and the through hole portion from the other side peripheral wall portion of the opening along the cylindrical side cutout portion; A knob portion (44) extending from the base portion in the radial direction of the rod.
[0020]
The light guide plate is formed at the end of the light guide plate so as to open outward from the other peripheral wall portion of the opening and move the knob portion in the insertion direction when the rod is inserted into the cylinder. A side cutout (29a) is provided.
Thus, since the light guide plate side cutout and the cylinder side cutout are formed in the light guide plate and the cylinder, respectively, the through hole is formed only corresponding to the base of the knob. The operation knob can be assembled to the light plate.
[0021]
For this reason, even if the knob portion of the operation knob is positioned to face the information display portion of the display board, the through-hole portion is only formed corresponding to only the base portion of the operation knob. There is no part corresponding to. Therefore, the conventional shadow does not appear on the information display section of the display board. As a result, the brightness of the display board can be made uniform as well as the information display section does not become difficult to see.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG.1 and FIG.2 has shown the principal part of one Embodiment of the speedometer for vehicles which concerns on this invention. This speedometer has a configuration in which a light guide plate 20A is employed instead of the light guide plate 20 in the speedometer of FIG.
[0023]
The light guide plate 20A has a configuration in which the assembly structure portion of the nulling knob 40 is changed as shown in FIGS. 1 and 2 in the light guide plate 20.
Specifically, in the light guide plate 20A, only the opening side through hole portion 24a among the through hole portions 24 of the light guide plate 20 is formed so as to communicate with the opening portion 23 through the one side peripheral wall portion 23a. (See FIG. 1).
[0024]
Further, the cylindrical body 20a includes a cutout portion 29 at the peripheral wall portion 28, and the cutout portion 29 extends from the one side peripheral wall portion 23a of the opening portion 23 as shown in FIG. 23 is formed in a U-shape through the peripheral wall 28 over the other portion 23b of the peripheral wall 23 (hereinafter referred to as the other-side peripheral wall portion 23b).
Here, the notch width of the notch 29 is set so that the base 42 of the knob 40 b passes through the notch 29.
[0025]
Further, as shown in FIGS. 1 and 2, the light guide plate 20A includes a notch 29a, and the notch 29a communicates with the opening 23 of the cylindrical body 20a on the other side peripheral wall 23b. To the end of the light guide plate 20A (the right end shown in FIG. 1).
In FIG. 2, reference numeral 29 b indicates a reinforcing wall portion, and this reinforcing wall portion 29 b extends downward from the position illustrated in FIG. 2 in the opening side through hole portion 24 a on the back surface of the light guide plate 20 </ b> A. Protrusions are formed. Other configurations are the same as those shown in FIG.
[0026]
In the present embodiment configured as described above, the nulling knob 40 is assembled to the cylindrical body 20a as follows.
The rod 40a is inserted coaxially from the opening 23 into the cylinder 20a through the coil spring 70 and resists the elasticity of the coil spring 70, so that the bottom wall annular portion of the cylinder 20a is formed at the lower end split projection 45. 25 is inserted and secured.
[0027]
Here, as described above, the coil spring 70 is sandwiched between the bottom wall annular portion 25 of the cylindrical body 20a and the annular portion 41 of the rod 40a.
At this time, the knob 40b is inserted into the notch 29 from the opening side through hole 24a of the light guide plate 20A against the elasticity of the coil spring 70 at the base 42 (see arrow a in FIG. 2). ).
[0028]
Along with this, portions other than the base portion 42 of the knob 40b, that is, the intermediate portion 43 and the knob portion 44 of the knob 40b move through the notch portion 29a of the light guide plate 20A and move to the back side thereof. In this case, the intermediate portion 43 and the knob portion 44 of the knob 40b do not pass through a portion other than the opening side through hole portion 24a in the through hole portion 24 as in the case of FIG. At such a stage, the knob portion 44 of the knob 40b protrudes outward from the end portion of the light guide plate 20A.
[0029]
In this state, when the rod 40a is rotated in the direction of the arrow b shown in FIG. 2 along the notch 29, the knob 40b receives the reaction force of the coil spring 70 at the base 42, and cuts. It moves along the notch 29 in the direction of the arrow c shown in FIG.
Thereby, the lower end split projection 45 is engaged with the bottom wall annular portion 25 of the cylindrical body 20a from the outside, and the base 42 of the knob 40b is set in the opening side through hole 24a (that is, the normal position). (See the two-dot chain line shown in FIG. 1).
[0030]
As described above, since the notches 29a and 29 are formed in the light guide plate 20A and the cylindrical body 20a, respectively, if only the opening-side through hole 24a is present in the longitudinal through hole 24 of FIG. The return zero knob 40 can be assembled to the light guide plate 20A. Thereby, the space required for assembling the nulling knob 40 to the light guide plate 20A can be reduced.
[0031]
Further, unlike the case of FIG. 3, there is no portion other than the opening-side through hole portion 24 a in the longitudinal through hole portion 24, and therefore the through hole portion 24 at the right end portion shown in FIG. Of these, portions other than the opening side through hole 24a are not reflected as shadows. As a result, the scale area 11 does not become difficult to see, and the brightness of the dial 10 can be made uniform.
[0032]
In implementing the present invention, the present invention is not limited to a vehicle speedometer, but is used in various pointer devices mounted on a vehicle, a vehicle display device using a display panel such as a liquid crystal panel or an EL panel, and other various fields. The present invention may be applied to a display device that is employed.
In carrying out the present invention, instead of the step motor 60, for example, a pointer drive unit having a cross coil of a cross coil type indicator may be employed.
[0033]
In the above embodiment, an example in which the present invention is applied in assembling the nulling knob 40 for resetting the travel distance display of the liquid crystal panel 30 as an odometer to the light guide plate 20A has been described. When assembling an operation knob for switching the display between the odometer and trip meter and an operation knob for switching the display content and display color of the liquid crystal cell when a liquid crystal panel is used instead of the dial plate 10, You may implement by applying this invention.
[Brief description of the drawings]
FIG. 1 is a plan view of a light guide plate and a nulling knob showing essential parts of an embodiment of the present invention.
FIG. 2 is a perspective view of a main part when the light guide plate of FIG. 1 is viewed from the oblique back side in the figure.
FIG. 3 is an exploded perspective view of a conventional vehicle speedometer.
[Explanation of symbols]
10 ... Dial, 11 ... Scale area, 20a ... Tube, 20A ... Light guide plate,
23 ... Opening part, 23a, 23b ... Peripheral wall part, 24a ... Opening side through-hole part,
29, 29a ... notch, L ... ramp, 40 ... nulling knob, 40a ... rod,
42 ... Base part, 43 ... Intermediate part, 44 ... Knob part.

Claims (1)

A display board (10);
A light guide plate (20A) that is provided on the back side of the display plate and introduces light from the light source (L) and enters the display plate;
A display device comprising an operation knob (40) for switching at least a part of display of the display board,
The light guide plate is a cylindrical body that protrudes from the end portion to the back surface side, and has an opening portion (23a) that opens to the front surface side at the end portion, and the opening portion. A through hole portion (24a) formed from one side peripheral wall portion (23a) toward the inside of the light guide plate,
A cylindrical body-side notch (29) is located on the other side of the opening located on the outer side of the light guide plate from the one peripheral wall through the peripheral wall intermediate portion of the cylindrical body. It is formed over the peripheral wall (23b),
The operation knob is
A rod (40a) inserted into the cylinder so as to be axially movable;
A base portion (42) extending in a radial direction from an axially intermediate portion of the rod and inserted into the one side peripheral wall portion and the through hole portion from the other side peripheral wall portion of the opening along the cylindrical body side cutout portion; And a knob portion (44) extending from the base portion in the radial direction of the rod,
An end portion of the light guide plate is formed to be opened outward from the other peripheral wall portion of the opening portion and to move the knob portion in the insertion direction as the rod is inserted into the cylindrical body. The display apparatus provided with the light-guide plate side notch part (29a).

Images