JP5233437B2 - Automotive display device, protective panel shape design method and shape design device - Google Patents

Description

  The present invention relates to an automotive display device, a protection panel shape design method, and a shape design device.

  Meter glass (protection panel) is installed on the front surface of instruments (measurement devices) such as automobile meters for the purpose of protection. If the background is reflected in such meter glass, the visibility of the instrument is reduced. For this reason, conventionally, an eaves portion that covers the instrument is provided to prevent entry of external light to the glass surface, and the back surface thereof is matted (Patent Document 1).

However, even if the eaves 120 is formed, if external light enters the eye range directly after being reflected by the glass surface, reflection will still occur. In order to avoid such reflection, the inclination of the glass surface 121 may be set so that the reflected light L8 does not enter the eye range I (inclination angle θc shown in FIG. 20). In addition, there exists a thing as described in the following literature (patent document 2) filed by this applicant as a related technique regarding the design method of the shape of meter glass.
JP-A-8-268117 JP2007-232452A

  The incident angle θ of external light (hereinafter also referred to as light rays) incident on the glass surface 121 is different from each other as shown in FIG. 21 if the position in the height direction is different even on the same glass surface. Thus, the incident angle θ2 of the light beam L2 incident on the glass surface 121 at the lower portion of the glass is necessarily larger than the incident angle θ1 of the light beam L1 incident on the glass surface at a position higher than that. In addition, as shown in FIG. 22, the eaves part covering the instrument is often curved in the vehicle width direction (left-right direction in FIG. 22) and the center side of the eaves protrudes toward the driver side. The distance e from the tip of the eaves to the glass surface is different at each position in the vehicle width direction.

  Therefore, the incident angle of the light beam on the glass surface 121 is different as shown in FIG. 23 if the position in the vehicle width direction is different even if the height position is the same. In general, the incident angle θ3 of the light beam L3 incident on the glass surface in the eaves is indicated by a solid line and is larger than the incident angle θ4 in the eaves central portion (the eaves at this time is indicated by a two-dot chain line).

  Since the light rays L2 and L3 having a large incident angle have a large reflection angle, the direction of the reflected light is closer to the eye range side, and the reflected light easily enters the eye range. For this reason, in order to prevent reflection, it is necessary to set the glass shape so that the eye range is also removed for the reflected light of these light rays L2 and L3, and a certain degree of curvature must be added to the glass shape. I do not get. On the other hand, if priority is given to not generating reflection and the glass shape is made to have a shape with a large curvature, for example, it becomes difficult to match the peripheral parts such as the instrument panel and the appearance is impaired.

  In view of the above, it is preferable that the shape of the protective panel is a gentle shape as a whole while providing a curvature so that the reflected light of the light rays L2 and L3 incident on the glass surface is out of the eye range. In order to cope with the above, in a severe position (a position where the incident angle is large), even if the curvature of the protective panel has to be set locally large, a loose position (a position where the incident angle is relatively small) ), It was necessary to set the curvature as small as possible.

  The present invention was created in view of the above problems, and provides an automotive display device that is excellent in anti-reflection performance and has a good appearance, and the shape of the protective panel used in the display device has the required performance. The purpose is to design the shape as gentle as possible.

  The present invention provides the above-described measurement device, an instrument panel provided with an eaves portion that curves in the vehicle width direction corresponding to the measurement device, and a see-through unit that is attached to cover the front surface of the measurement device below the eaves portion. A protective display panel for an automobile, wherein the protective panel has a shape in which the curvature in the horizontal direction gradually increases from the upper side to the lower side and protrudes toward the eye range side. It is characterized by being.

  According to the present invention, as shown in FIG. 24, the curvature in the horizontal direction is set large near the lower side of the protective panel (a severe position). As described above, in the portion where the curvature is set to be large, the horizontal angle of the protective panel surface 122 is smaller than that in the case where the curvature of the same portion is set to be small. As a result, the incident angle θ5 of the light beam to the protective panel surface 122 is small. Become. Therefore, normally, the light beam L9 (the light beam incident on the surface of the protective panel at a position close to the end in the vehicle width direction) where the reflected light enters the eye range I can be reflected so as to remove the eye range I. (Refer to the light beam L10 in FIG. 24). Therefore, the so-called reflection prevention performance is excellent. Further, the protection panel has a shape in which the horizontal curvature gradually increases from the upper side to the lower side. In other words, the curvature is set to be large at other parts (positions where conditions are loose) except the lower side. The entire protective panel has a gentle shape. Therefore, it is easy to match with peripheral parts such as an instrument panel, and the appearance is not impaired. In short, according to the present invention, it is possible to set the shape of the protective panel to a gentle shape on the premise that the reflection preventing performance is excellent, and as a result, an automotive display device that is excellent in appearance is provided. it can.

  The present invention relates to an instrument panel that is provided with an eaves portion that is curved in the vehicle width direction so as to correspond to the measurement device, and is installed so as to cover the front surface of the measurement device below the eaves portion. The shape design method of the protection panel of the above, wherein the light beam that has entered the protection panel through the tip of the eaves part passes through a specific area between the tip of the eaves part and the eye range, and goes out of the eye range. When the angle of the surface of the protective panel to be reflected is defined as a reflection condition establishment angle, based on the plotting data including at least the tip shape data of the eaves part and the eye range data in the vertical direction A longitudinal section line of the protective panel consisting of a plurality of minute line segments that are continuous and each satisfy the reflection condition establishment angle, a plurality of sections in different vehicle width directions The size of the horizontal curvature of the protective panel based on the end points in the vertical direction among the end points of the minute line segments constituting the vertical section line on each cross section determined in Is determined at each position in the vertical direction, and the three-dimensional shape of the protection panel is determined based on the horizontal curvature of the protection panel at each position obtained.

  The present invention relates to an instrument panel that is provided with an eaves portion that is curved in the vehicle width direction so as to correspond to the measurement device, and is installed so as to cover the front surface of the measurement device below the eaves portion. The shape design apparatus of the protection panel according to claim 1, wherein the light beam incident on the protection panel from the tip of the eaves part is caused to escape from the eye range through a specific region between the tip of the eaves part and the eye range. When the angle of the surface of the protective panel to be reflected is defined as a reflection condition establishment angle, a data input unit that accepts input of drawing data including at least the tip shape data of the eaves part and the eye range data; A storage unit that stores the input drawing data, and a vertical direction based on the drawing data stored in the storage unit, and A longitudinal section line determining section for determining longitudinal section lines of the protective panel composed of a plurality of minute line segments satisfying the reflection condition establishment angle on a plurality of sections at different positions in the vehicle width direction, and on each determined section A curvature determining unit that determines the magnitude of the horizontal curvature of the protective panel based on each of the end points in the vertical direction among the end points of each minute line segment that constitutes the longitudinal cross-sectional line of An apparatus for designing a shape of a protective panel.

  According to the above invention, the element that determines the shape of the protection panel includes a `` vertical cross-sectional line composed of a plurality of minute line segments that are continuous in the vertical direction and satisfy the reflection condition establishment angle '', and There are a plurality of the longitudinal cross-sectional lines, which are determined on different cross-sections in the width direction. If it does in this way, it will become possible to set the shape of a protection panel in consideration of each of each light ray which injects into each position (each position of a height direction and a width direction) on the surface of a protection panel, and the result The protective panel can be set to a shape with as few curvatures as possible. That is, in the lower part of the panel where the incident angle with respect to the protective panel is considered to be large, the horizontal curvature of the panel is set to be large, whereas in other places, that is, in the center and the upper part of the protective panel, both The horizontal curvature of the panel is set small.

The following configuration is preferable as an embodiment of the present invention.
The longitudinal cross-sectional line of the protective panel is divided into three cross sections: a central cross section corresponding to the top of the eaves part, a right cross section spaced a predetermined distance from the central cross section in the vehicle width direction, and a left cross section. The magnitude of the curvature in the horizontal direction of the protective panel based on the three end points in the vertical direction among the respective end points of the minute line segments constituting the determined vertical cross-section lines on the three cross sections. Is determined at each position in the vertical direction. If it does in this way, since the magnitude | size of the curvature of the horizontal direction of a protection panel can be determined only by determining a longitudinal direction cross section line on three cross sections, it will become a simple shape design method.

  According to the present invention, it is possible to set the shape of the protective panel to a gentle shape on the premise that the reflection prevention performance is excellent, and as a result, it is possible to provide an automotive display device that is excellent in appearance. .

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The automobile display device 10 according to the present embodiment displays various information such as a traveling speed and an engine rotation speed on a driver seated in a driver's seat, and includes an instrument panel 12, a measuring device 14, a meter glass 16 (the present invention). This is mainly composed of “protection panel”.

1. Overall Configuration of Display Device for Automobile The instrument panel 12 is an interior part attached to the front part of the vehicle interior, and has a shape that is long in the vehicle width direction. The instrument panel 12 is made of a synthetic resin, and a portion corresponding to the front of the driver's seat is a hood portion 12 </ b> A that forms a substantially rectangular opening that is long in the vehicle width direction. On the back side of the hood portion 12A (left side in FIG. 2), the measuring device 14 is attached in a vertical direction with the display surface facing the driver side via fixing means (not shown).

  The measuring device 14 is a so-called combination meter in which a speedometer M1, a tachometer M2, and a fuel meter M3 are arranged side by side and are provided on a common scale board 18. The display contents of these measuring devices 14 are visually recognized by the driver through the opening. It can be configured.

  As shown in FIG. 3, the hood portion 12 </ b> A has an upper wall portion that protrudes toward the driver's seat, and forms an eave portion 20 that blocks external light from entering the measuring device 14. As shown in FIG. 3, the eaves portion 20 has a convex curve shape protruding toward the driver side (the lower side in FIG. 3), forms a top portion corresponding to the center of the measuring device 14, and has a symmetrical shape on the left and right. It has become. A meter cluster 22 is attached to the inner wall of the hood portion 12A (see FIG. 2). The surface color of the meter cluster 22 is black, for example, and is configured to absorb light incident on the surface of the meter cluster 22.

  Further, a colorless and transparent meter glass 16 is attached in the opening of the hood portion 12A so as to cover the front surface of the measuring device 14 (the right side in FIG. 2). The meter glass 16 has a horizontally long shape that matches the opening shape of the hood portion 12A, and has a bilaterally symmetric shape with the top of the hood portion 12A as the center. The shape of the meter glass 16 will be described in detail. As shown in FIG. 2, the meter glass 16 has a vertical cross-sectional shape that moves from the upper end to the lower end of the meter glass 16 toward the driver side (FIG. 2). The lower end 16B of the meter glass protrudes toward the driver side. In FIG. 2, a distance i1 between the upper end 16A and the lower end 16B of the meter glass on a longitudinal section (hereinafter referred to as a central section) at the top of the meter glass 16 is illustrated.

  The meter glass 16 has a horizontal curvature and is curved toward the driver. And the curvature of the meter glass 16 in the horizontal direction (the center of curvature is on the driver side) increases from the upper end 16A of the meter glass toward the lower end 16B, and as shown in FIG. Both sides project greatly toward the driver (the distance i2 between the upper end 16A and the lower end 16B of the meter glass on the longitudinal section at the right end). Thus, the meter glass 16 is curved in both the vertical and horizontal directions, and has a smooth curved surface as a whole.

2. Method for drawing meter glass shape In this embodiment, a CAD (Computer Aided Design) apparatus allows a designer to perform a cross section on the central cross section (AA cross section) in FIG. 3 and a right cross section (B -B line cross section) and on the three cross sections on the left side cross section (CC line cross section) in FIG. 3, the longitudinal cross section lines (vertical cross section lines AO in FIG. The longitudinal sectional line AR, the longitudinal sectional line AL in FIG. 16, is drawn, and the horizontal curvature of the meter glass 16 is determined for each height position from the obtained three longitudinal sectional lines. The shape of the glass 16 is determined. The right side cross section and the left side cross section are parallel to the central cross section and are cross sections separated by a predetermined distance x1 on the left and right, respectively, and the predetermined distance x1 is arbitrarily set by the designer.

  As shown in FIG. 6, the necessary data for drawing the longitudinal section line is the shape data of the eaves part 20, eye range I (statistical distribution of the driver's viewpoint position due to physique differences, etc. And is represented by an ellipse in this embodiment). In the present embodiment, the description will be made assuming that the shape data of the eaves portion 20 and the shape data of the eye range I are input on the CAD apparatus.

(1) Drawing a longitudinal section line on the center section

  (A) In order to draw the longitudinal section line AO on the central section, first, it is necessary to set an initial point a1 which is the upper end point of the longitudinal section line. The initial point a1 can be arbitrarily set by an input operation as long as the designer considers the position of the measuring device 14 or the like and is on the lower wall of the eaves portion 20.

  (B) When the initial point a1 is set, next, as shown in FIG. 7, the initial point a1 and the tip point b1 of the eaves part 20 are connected to draw an incident line AB1. Next, the incident straight line AB1 is rotated around the initial point a1 by a predetermined angle α in the direction away from the eye range (counterclockwise in FIG. 7) to draw the eaves side boundary line H1.

  (C) Thereafter, the eye range side boundary line AC1 that passes through the initial point a1 and contacts the upper side of the eye range I is drawn.

  (D) A bisector PL1 of an angle formed between the eaves side boundary line H1 and the eye range side boundary line AC1 is drawn through the initial point a1.

  (E) Next, an orthogonal line TL1 passing through the initial point a1 and orthogonal to the bisector PL1 is drawn. Through the above plotting, a line segment having a predetermined line length s orthogonal to the bisector PL1 with the initial point a1 as a starting point, that is, a first minute line segment AD1 is determined.

  (F) Next, as shown in FIG. 8, with the end point d1 of the minute line segment AD1 as the next initial point, an incident straight line AB2 connecting the next initial point d1 and the eaves portion tip point b1 is drawn. Then, the incident straight line AB2 is rotated around the end point d1 in a direction away from the eye range by a predetermined angle α to draw the eaves side boundary line H2. Thereafter, an eye range side boundary line AC2 passing through the initial point d1 and in contact with the upper side of the eye range is drawn, and the bisector PL2 of the angle formed by passing through the initial point d1 and the eaves side boundary line H2 and the eye range side boundary line AC2 is drawn. Draw.

  Next, an orthogonal line TL2 that passes through the initial point d1 and is orthogonal to the bisector PL2 is drawn. Through the above drawing, the line segment of the line length s orthogonal to the bisector PL2 with the initial point d1 as the starting point, that is, the second minute line segment AD2 is determined. 5 to 7, the eaves portion 20 is omitted for easy illustration.

  In this way, by repeating the plotting of (b) to (e) with the end point of the drawn minute line segment as the initial point in the next minute line segment, the minute line segments continuous in the vertical direction are drawn in order. it can. Then, when the drawn fine line segment reaches the bottom wall 12B of the hood portion, the drawing of the fine line segment is completed. Thereby, as shown in FIG. 5, the longitudinal section line AO on the center section composed of a plurality of minute line segments AD1 to ADn is drawn.

  The minute line segments AD1 to ADn constituting the longitudinal section line thus drawn are orthogonal to the bisector of the angle formed by each eaves side boundary line H1 to Hn and each eye range side boundary line AC1 to ACn. It is a line. For this reason, each of the incident straight lines (straight lines connecting the initial point on each minute line segment and the tip end point b1) AB1 to ABn and entering each point on the minute line segment from the eaves tip end point b1. The light ray is regularly reflected on each minute line segment and travels inside each of the eye range side boundary lines AC1 to ACn, passes through the vicinity of the upper end of the eye range I, and passes above the eye range I. For example, as shown in FIG. 5, the incident light beam L4 incident on the point d is specularly reflected on the minute line segment AD, and the reflected light beam L5 travels inside the eye range side boundary line AC and near the upper end of the eye range I. That is, it passes through the specific area D between the eaves tip end point b1 and the eye range I and moves upward above the eye range I.

  In addition, by “drawing a minute line segment” according to the above drawing procedure, the “reflection condition angle” defined in the present invention (“the light beam incident on the protective panel from the tip of the eaves portion is removed above the eye range”). The inclination of the glass surface of the meter glass 16 can be determined so that the angle of the surface of the protective panel to be reflected) is satisfied. In the present embodiment, the straight lines obtained by rotating the respective incident straight lines AB by a predetermined angle α are used as the eaves-side boundary lines H. This is because the reflected light of the light incident on the minute line segments has a margin. In other words, it is a margin angle that is outside the eye range I. If such a margin is not taken, each minute line segment AD is turned into a bisector of the angle formed by each incident straight line AB and each eye range side boundary line AC. It is also possible to use orthogonal lines that are orthogonal to each other.

  (2) Drawing of longitudinal section line on right side section

(G) In order to draw the longitudinal section line AR on the right side section, first, as shown in FIG. 9, an initial curve E1 having an initial point a1 as a vertex and a predetermined curvature in the horizontal direction is set. The initial curve E1 defines a line at the upper edge of the meter glass 16, and its radius of curvature is arbitrarily set by the designer in consideration of the ease of alignment when the meter glass 16 is fitted to the instrument panel 12. . The initial curve E1 may be set to have an infinite curvature radius, that is, a straight line.

(H) Among the points constituting the initial curve E1, one point on the right side cross section is set as the initial point f1 on the right side cross section (FIG. 9).

(I) As shown in FIG. 10, the minute line segment ADR1 having the same angle and the same length as the first minute line segment AD1 on the central cross section drawn in the drawing of (e) passes through the initial point f1 on the right side. Draw on the cross section.

(J) After that, as shown in FIG. 11, the minute line segment ADR1 is rotated by a predetermined angle β1 around the initial point f1, and the minute line segment ADR1 (FG1) after rotation becomes the eaves portion side boundary line k1 (elongation). A straight line obtained by rotating an incident straight line FH1 connecting the tip point h1 of the portion 20 and the initial point f1 by a predetermined angle γ1, and an eye range side boundary line FI1 (tangent drawn from the initial point f1 to the upper side of the eye range I). Is perpendicular to the bisector PR1 of the angle formed by

(K) Next, it passes through the end point g1 of the minute line segment FG1 determined as described above, and has the same angle and the same length as the second minute line segment AD2 on the central section drawn in the drawing (f). The minute line segment ADR2 is drawn. Thereafter, as shown in FIG. 12, the minute line segment ADR2 is rotated by a predetermined angle β2 around the initial point g1 toward the eye range, and the minute line segment ADR2 (FG2) after rotation becomes the eaves portion side boundary line K2 ( A straight line obtained by rotating the incident straight line FH2 connecting the tip point h1 of the eaves part 20 and the initial point g1 by a predetermined angle γ1, and an eye range side boundary line FI2 (tangent drawn from the initial point g1 to the upper side of the eye range). Is perpendicular to the bisector PR2 of the angle formed by

  In this way, the end point of the drawn minute line segment FG is set as the initial point in the next minute line segment, the drawings (i) to (j) are plotted, and the minute line segment ADn on the center section is set on the next center section. By substituting for the minute line segment AD (n + 1) and repeatedly, the minute line segment FG continuous in the vertical direction can be drawn in order. As a result, a longitudinal section line AR on the right-side section composed of a plurality of minute line segments FG1 to FGn is drawn (see FIG. 13).

  As described above, in this drawing method, when the vertical section line AR is drawn on the right-side cross section, each of the minute line segments AD1 to ADn drawn at the same angle as that on the center cross section is set with the initial point as the axis. The minute line segments FG1 to FGn after rotation are pushed toward the eye range I side and slanted in a slanted state as compared with that of the central cross section. By doing in this way, the eaves portion 20 is curved in the vehicle width direction, and the angle of the light beam incident on the minute line segment through the tip of the eaves portion 20 on the right side cross section is on the central cross section. In spite of being severer than that, the incident angle of the light beam incident on the minute line segment is reduced. Therefore, the reflection angle itself is naturally reduced, and light rays (indicated by L6 as an example) incident on each minute line segment pass through the vicinity of the upper end of the eye range I on the right side cross section as in the case of the central cross section. Thus, it is possible to reflect the light so as to escape upward from the eye range I (shown as a reflected light beam L7 as an example).

According to the present invention, “by moving the end point of the first minute line segment on the right-side cross section to the eye range side, the inclination of the first minute line segment is set to an angle that satisfies the reflection condition establishment angle. In this drawing method, “correction” is realized by rotating the micro-segment ADR1 by a predetermined angle around the initial point f1 toward the eye range I as shown in FIG. 11, for example, as shown in FIG. In addition to this, correction by the following drawing is possible.
As shown in FIG. 14, an auxiliary line KL1 that passes through the end point dr1 of the minute line segment ADR1 and is parallel to the eye range side boundary line FI1 is drawn, and the end point dr1 is made closer to the eye range I on the auxiliary line KL1. Is moved by a predetermined distance x2 to set g1. Thereby, the inclination of the minute line segment FG1 drawn by connecting the initial points f1 and g1 may be corrected to an angle that satisfies the reflection condition establishment angle.
Further, as shown in FIG. 15, a tangent line QL1 is drawn from the end point dr1 of the minute line segment ADR1 to the upper side of the eye range I, and the end point dr1 is brought closer to the eye range I on the tangent line QL1 by a predetermined distance x3. You may set g1 by moving.

(3) Drawing of longitudinal section line on left side cross section (l) As shown in FIG. 16, among the points constituting the initial curve E1, the point on the left side cross section is the initial point m1 on the left side cross section. Set to Next, with reference to the initial point m1 on the left side cross section, micro line segments MP1 to MPn having the same angle and the same length as the micro line segments FG1 to FGn on the right side cross section are respectively drawn, and this is drawn on the left side. Let it be a longitudinal section line AL on the section.

(4) Determination of curvature in the horizontal direction (m) First, as shown in FIG. 17, the lower end point g1 of the minute line segment FG1 of the longitudinal section line AR on the right side section and the longitudinal section line AO on the center section A curvature determination curve B1 passing through the lower end point d1 of the minute line segment AD1 and the lower end point p1 of the minute line segment MP1 of the longitudinal section line AL on the left side cross section is drawn. Thereby, the magnitude | size of the curvature of the horizontal direction of the meter glass 16 in this height is determined.

  Next, the lower end point g2 of the minute line segment FG2 of the longitudinal section line AR on the right side section below the curvature determination curve B1, the lower end point d2 of the minute line segment AD2 of the longitudinal section line AO on the center section, the left side A curvature determination curve B2 passing through the three lower end points p2 of the minute line segment MP2 of the longitudinal section line AL on the rectangular section is drawn. Thereby, the magnitude | size of the curvature of the horizontal direction of the meter glass 16 in this height is determined.

  As described above, the end points of the minute line segments constituting the three longitudinal cross-sectional lines, that is, the respective end points g1 to gn of the minute line segments FG on the right-side cross section, and the minute line segments FG on the central section. The curvature determination curves B1 to Bn passing through the three end points in the longitudinal direction among the end points d1 to dn and the end points p1 to pn of the minute line segments FG on the left side cross section are drawn in order. Thereby, each curvature of the horizontal direction in each height is determined.

  The curved surface that smoothly connects the initial curve E1 and each of the curvature determination curves B1 to Bn is the surface shape (three-dimensional shape) of the meter glass 16, in other words, the longitudinal section line AO on the center section and each height position. The surface shape of the meter glass 16 is determined based on the magnitude of each curvature set in (1). The various data used in the above drawing, that is, the shape data of the eaves portion 20, the shape data of the eye range I, the initial point a1 on the central section, and the radius of curvature of the initial curve E1 correspond to the drawing data in the present invention. Yes.

  In the present embodiment, when the shape of the meter glass 16 is set, the size of the meter glass 16 is drawn so that it fits exactly into the opening of the hood portion 12A. Can be attached to the instrument panel 12 as it is. In addition, for example, it is possible to draw the size of the meter glass 16 larger than the opening shape of the hood portion 12A, cut out the manufactured product according to the opening shape, and assemble it.

Next, the effect of this embodiment will be described.
In the present embodiment, in the three cross sections, the central cross section, the right side cross section, and the left side cross section, a vertical cross section line is drawn so that incident light passes through the vicinity of the upper end of the eye range I and passes above the eye range I. The curved surface shape of the meter glass 16 is designed from these three longitudinal sectional lines. For this reason, it becomes possible to set the shape of the meter glass 16 in consideration of each individual light ray incident on each position (height direction, each position in the vehicle width direction) on the surface of the meter glass 16.

As shown in FIG. 18, when the curvature of the eaves portion is smaller than the eaves portion 20 of this embodiment (indicated by reference numeral 20C in FIG. 18), when the shape of the meter glass is set by this drawing method, As shown in the meter glass 16C indicated by the alternate long and short dash line in FIG. 18, the magnitude of the curvature at the lower part of the meter glass is reduced, and the portion with the larger curvature of the meter glass can be set to the smallest possible shape.
As a result, the shape of the meter glass 16 can be set to a gentle shape on the premise that the reflection prevention performance is excellent, and as a result, the automotive display device 10 having excellent appearance can be provided.

<Embodiment 2>
In the first embodiment, the designer sets the shape of the meter glass 16 by drawing a longitudinal section line, a curvature determination curve, and the like on the CAD device according to a determined drawing procedure. On the other hand, in the second embodiment, the longitudinal section line and the curvature determination curve are automatically determined by the design device 100 described below (corresponding to the “shape design device” in the present invention), and the meter glass 16 The shape is set automatically. The configuration of the design apparatus 100 is as shown in FIG. 19, which includes a CPU 102, an I / O interface 104 (corresponding to a data input unit in the present invention), and a storage unit 106, and a user interface 108 for the I / O interface. The display device 110 is electrically connected.

  The storage unit 106 stores a drawing program 106A including a longitudinal section line drawing program and a curvature determination curve drawing program. The longitudinal section line drawing program calculates the longitudinal section lines AO, AL, AR of each section of the center section, the left side section, and the right side section by calculation processing based on the input drawing data. The drawing operations (a) to (l) described in the first embodiment are programmed so as to be executed by arithmetic processing.

  Further, the curvature determination curve drawing program calculates the curvature determination curves B1 to Bn at the respective height positions based on the respective longitudinal sectional lines calculated by the arithmetic processing by the arithmetic processing. (M) described above is programmed to be executed by arithmetic processing.

  The CPU 102 executes the longitudinal section line drawing program to calculate the longitudinal section line on each section and calculates the longitudinal section line determination unit 102A, and executes the curvature determination curve drawing program at each height position. A curvature determination unit 102B that calculates curvature determination curves B1 to Bn.

  If the design apparatus 100 is configured as described above, the drawing data (that is, the tip shape data of the eave portion 20 and the data of the eye range I) required for setting the meter glass shape by the user interface 108 such as a keyboard is used. , The data of the initial point a1 on the central section, the data of the initial curve E1) are input to the storage unit 106, and then the longitudinal section line determination unit 102A of the CPU 102 The longitudinal sectional line on the cross section is determined, and then the curvature determining curves B1 to Bn at the respective height positions based on the respective longitudinal sectional lines determined by the curvature determining unit 102B of the CPU 102, and thus the shape of the meter glass 16 Is calculated. The calculated shape of the meter glass 16 is displayed on the display device 110. As described above, if the drawing operation of the first embodiment is automatically performed by the design apparatus 100, it is possible to save time and trouble of drawing.

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

  (1) In this embodiment, in order to determine the curvature in the horizontal direction, each longitudinal section line is drawn on three cross sections. However, the longitudinal section line is drawn on a plurality of four or more sections. The curvature in the horizontal direction may be determined. In addition, this cross section may not include the central cross section.

  (2) In the present embodiment, a glass panel (meter glass 16) is used as a protective panel that covers the front of the measuring device 14, but the protective panel is not necessarily made of glass, for example, a colorless and transparent acrylic plate is used. It may be used.

  (3) In the present embodiment, an example in which the eaves portion 20 is integrally formed with the instrument panel 12 is illustrated, but may be a separate component from the instrument panel 12.

  (4) In the present embodiment, the three meters M1, M2, and M3 are collectively covered with a single meter glass 16, and the eaves portion 20 is also an integral part. The present invention can also be applied to a configuration in which a section is provided. In this case, each meter may be covered with meter glass one by one, and each meter glass may be drawn so as to satisfy the reflection establishment condition with respect to each eaves portion, and the shape of each meter glass may be designed.

The figure which shows the whole structure of the display apparatus for motor vehicles Cross-sectional view of a display device for automobiles (cross-sectional view along line AA in FIG. 3) Plan view of automotive display device Perspective view showing the shape of meter glass Diagram showing longitudinal section line on center section Diagram showing drawing data The figure which showed the place where the 1st minute line segment was drawn on the central section The figure which showed the place where the 2nd minute line segment was drawn on the central section Diagram showing initial curve set The figure which showed the place which drawn minute line segment ADR1 The figure which showed the place which correct | amended the inclination of the 1st minute line segment on the right side cross section to the angle which satisfies reflection condition establishment angle The figure which showed the place which correct | amended the inclination of the 2nd minute line segment on the right side cross section to the angle which satisfies reflection condition establishment angle Diagram showing longitudinal section line on right section The figure which shows the other drawing method for correct | amending the inclination of a 1st minute line segment The figure which shows the other drawing method for correct | amending the inclination of a 1st minute line segment Diagram showing the longitudinal section line on the left side section Diagram showing the curvature determination curve The figure which shows the meter glass shape corresponding to the curved shape of the eaves part FIG. 3 is a block diagram illustrating an electrical configuration of a design apparatus according to a second embodiment. Diagram showing reflection of external light on the glass surface Diagram showing the incidence of external light on the glass surface when the height position is different The figure which shows the curve shape of the eaves in the vehicle width direction Diagram showing the incidence of external light on the glass surface when the position in the vehicle width direction is different The figure which shows the effect of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Display apparatus 12 for motor vehicles ... Instrument panel 14 ... Measuring device 16 ... Meter glass (equivalent to "protection panel" in this invention)
20 ... eaves part 100 ... design apparatus (equivalent to "shape design apparatus" in the present invention)
102A... Longitudinal section line determination unit 104... I / O interface (corresponding to a data input unit in the present invention)
106: Storage unit I: Eye range b1, h1 ... eaves tip end point (corresponding to "eave portion tip" in the present invention)
L4: incident light (corresponding to “light incident on the protective panel” in the present invention)
D: Specific region a1: Initial point f1 on the central cross section: Initial point m1 on the right side cross section: Initial point AD on the left side cross section: Micro line segment FG on the central cross section FG: Micro line segment MP on the right side cross section ... A fine line segment AO on the left side cross section ... A longitudinal cross section line AR on the central cross section ... A vertical cross section line AL on the right side cross section ... A vertical cross section line AB on the left side cross section ... An incident straight line (" Equivalent to the line connecting the tip of the eaves on the center section ”)
H ... eaves side boundary line AC ... eye range side boundary line PL ... corner bisector AD1 ... first minute line segment AD2 ... second minute line segments g, d, p ... lower end point (" Equivalent to each endpoint ”
E1 ... Initial curve B ... Curvature determination curve (corresponding to "curve passing through three end points" in the present invention)

Claims (5)

A measuring device;
An instrument panel provided with an eaves portion curved in the vehicle width direction corresponding to the measurement device;
A translucent protective panel attached so as to cover the front surface of the measuring device below the eaves part, and a display device for an automobile,
The protection panel is brought to from the upper side to the lower side, the horizontal curvature around the eye range side gradually increases, and automotive display device, characterized in that a shape projecting to the eye range side . A translucent protective panel attached to an instrument panel provided with an eaves portion curved in the vehicle width direction so as to correspond to the measurement device so as to cover the front surface of the measurement device below the eaves portion. A shape design method,
As the protective panel goes from the upper side to the lower side, the curvature in the horizontal direction centered on the eye range side gradually increases, and the shape protrudes toward the eye range side.
The light beam incident on the protective panel through the tip of the eaves, the protection panel surface that reflects as cause loss outside the eye range through the specific region between the tip and the eye range of the eaves Is defined as the reflection condition establishment angle,
Based on the drawing data including at least the tip shape data of the eaves portion and the data of the eye range, a plurality of minute line segments (FG, AD, MP), the longitudinal cross-sectional lines (AR, AO, AL) of the protective panel are determined on the cross-sections at different locations in the vehicle width direction,
The longitudinal section lines on each of said cross-section determined (AR, AO, AL) of the respective end points of the minute line segments constituting the respective end point in the longitudinal direction of the isotopes (gn, dn, pn) on the basis of the , Determining the size of the curvature in the horizontal direction around the eye range side of the protective panel, at each position in the vertical direction,
Obtained on the basis of the magnitude of the horizontal curvature centered on the eye range side of the protective panel in each position, the protection panel is characterized in that so as to define a three-dimensional shape of the protection panel Shape design method. The longitudinal section line of the protection panel, a central cross section corresponding to the top of the eaves portion, and the right side section from said central section separated by a predetermined distance in the vehicle width direction at a left side on three cross sectional Decide
Three end points (gn, dn, pn) in the vertical direction among the end points of each minute line segment constituting each of the longitudinal section lines (AR, AO, AL) on the determined three sections. 3. The protection panel according to claim 2, wherein the magnitude of the curvature in the horizontal direction centered on the eye range side of the protection panel is determined based on the position at each position in the vertical direction. Shape design method. In the eaves portion having a symmetrical shape in the vehicle width direction,
(A) setting an initial point (a1) to be an upper end of the protective panel on the central cross section;
(B) A direction in which a line connecting the initial point (a1) and the tip of the eaves part (b1) on the central cross section is separated from the eye range by a predetermined angle (α) with the initial point (a1) as a center. Draw the eaves side boundary line (H1) rotated to
(C) Draw an eye range side boundary line (AC1) passing through the initial point (a1) and in contact with the upper side of the eye range;
(D) drawing an bisector (PL1) of an angle formed by the two boundary lines (H1, AC1) through the initial point (a1);
(E) A first minute line segment (AD1) having a predetermined line length passing through the initial point (a1) and orthogonal to the bisector (PL1) is determined on the central cross section;
The end point of (f) determined first minute line segments (AD1) (d1) as the initial point, by performing the drawing of the (e) from said (b), the second fine on the central section determining the line (AD2), and drawing the plurality of minute line segments (AD) than made on the central plane the longitudinal section line continuous in the longitudinal direction (AO) by repeatedly performing this,
(G) setting an initial curve (E1) that passes through the initial point (a1) and extends linearly in the horizontal direction or curves with a predetermined curvature in the horizontal direction;
(H) Of the points constituting the initial curve (E1), a point on the right side cross section is set as an initial point (f1) on the right side cross section,
(I) through the initial point on the right side section (f1), the first minute line segments (AD1) the same angle on the central cross section, the right side on the first section of the same length Draw a minute line segment (ADR1)
(J) By moving the end point of the first minute line segment (ADR1) on the right-side cross section toward the eye range side, the first minute line segment (ADR1) on the right-side cross section is moved. The inclination is corrected to an angle that satisfies the reflection condition establishment angle,
(K) the end point of the first minute line segments on the right side section after the inclination correction (FG1) and (g1), the next initial point, said plotting of the (j) from (i), By replacing the first minute line segment with the second minute line segment, the second minute line segment (FG2) on the right side cross section is determined, and the drawing for determining the minute line segment is repeatedly performed. the longitudinal section line on the right side a cross section in the longitudinal direction comprises a plurality of minute line segments successive (FG) and (AR) draw by,
(L) the initial curve (E1) of the points constituting the, the point on the left side section set to an initial point on the left side sectional (m1), the initial point on the left side section set ( Draw a minute line segment (MP) having the same angle and the same length as each minute line segment (FG) constituting the longitudinal section line (AR) on the right-side cross section on the basis of m1). the longitudinal section line on the left side section of the (AL) determined by,
(M) Three end points (gn, dn, pn) in the vertical direction among the end points of each minute line segment constituting each of the longitudinal section lines (AR, AO, AL) on the three sections. 4), the horizontal curvature centering on the eye range side of the protective panel is determined at each position in the vertical direction. The shape design method of the protection panel as described in 2. A translucent protective panel attached to an instrument panel provided with an eaves portion curved in the vehicle width direction so as to correspond to the measurement device so as to cover the front surface of the measurement device below the eaves portion. A shape design device,
As the protective panel goes from the upper side to the lower side, the curvature in the horizontal direction centered on the eye range side gradually increases, and the shape protrudes toward the eye range side.
The light beam incident on the protective panel from the front end of the eaves, the angle of the protective panel surface that reflects as cause loss outside the eye range through the specific region between the tip and the eye range of the eaves Is defined as the reflection condition establishment angle,
A data input unit that receives input of plotting data including at least the tip shape data of the eaves portion and the data of the eye range;
Based on the drawing data stored in the storage unit, the storage unit that stores the input drawing data, and the plurality of minute line segments that are continuous in the vertical direction and each satisfy the reflection condition establishment angle. A longitudinal section line determining section that determines longitudinal section lines of the protective panel on a plurality of sections in different vehicle width directions; and
Among the end points of the minute line segments constituting the longitudinal section lines on each of said cross-section determined, based on the end points in the longitudinal direction of the isotope, with a focus on the eye range side of the protection panel horizontal A protective panel shape designing apparatus, comprising: a curvature determining unit that determines a magnitude of a curvature in a direction.

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