Patent Publication Number: US-2020300675-A1

Title: Gauge

Description:
TECHNICAL FIELD 
     The present invention relates to a gauge, and in particular to a gauge provided with an anti-reflection part having fine conical protrusions. 
     BACKGROUND ART 
     As a gauge provided with an anti-reflection part having fine conical projections, there is the one disclosed in Patent Literature 1. The gauge described in Patent Literature 1 is intended to reduce external light reflection by providing, on a rear face of a cover plate, a film having a plurality of conical protrusions disposed in pitches, each of which is equal to or shorter than a wavelength of visible light (a so called film utilizing moth&#39;s eye structure). 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2015-78924 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     In the gauge described in Patent Literature 1, the film (anti-reflection part) is provided all over the rear face of the cover plate and thus the anti-reflection part comes into contact with exterior parts and then is released, or alternatively, air bubbles get into the anti-reflection part, and there is an apprehension that the appearance is degraded. 
     The present invention has been made in view of the circumstance described above, and it is an object of the present invention to provide a gauge which is capable of restraining degradation of an appearance exerted by a failure of an anti-reflection part. 
     Solution to Problem 
     To achieve the above object, a gauge according to the present invention includes: 
     a display part that displays an amount of measurement; 
     a translucent plate located at a front side of the display part and causing visual recognition through the display part; 
     a clamp part that clamps an end part of the translucent plate; and 
     an anti-reflection part provided on a face at a side of the display part of the translucent plate and having a plurality of conical protrusions arrayed in pitches, each of which is equal to or less than a wavelength of visible light, 
     in which the anti-reflection part is provided at a position not in the end part and not in contact with the clamp part. 
     Effect of the Invention 
     According to the present invention, degradation of an appearance due to a failure of an anti-reflection part can be avoided, 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view showing a gauge according to a first embodiment of the present invention, in which  FIG. 1( a )  is a plan view, and  FIG. 1( b )  is a schematic cross section taken along the line A-A shown in  FIG. 1( a ) . 
         FIG. 2  is an enlarged view of portion B shown in  FIG. 1( b ) . 
         FIG. 3  is an enlarged view of portion C shown in  FIG. 1( b ) . 
         FIG. 4  is a view for explaining a gauge according to a second embodiment. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     An embodiment of the present invention will be described with reference to the drawings. 
     First Embodiment 
     A gauge  100  according to a first embodiment, as shown in  FIG. 1( a )  and  FIG. 1( b ) , is configured as an indicator-type gauge that displays an amount of measurement by an indicator  10 . The gauge  100  is mounted to a vehicle for example, and displays, for a user (mainly a driver), the amounts of measurement related to the vehicle such as a vehicular speed, the number of engine rotations, or the remaining amount of fuel. 
     Hereinafter, for the sake of a clear understanding of the configuration, constituent elements of the gauge  100  will be appropriately described presupposing that an upper side in  FIG. 1( b )  showing a cross section of the gauge  100  is a “front side”, and a lower side is a “rear side”. Considering the easiness of view, hatchings indicative of the cross section in  FIG. 1( a )  and  FIG. 3  (also  FIG. 4 ) are appropriately omitted. 
     The gauge  100 , as shown in  FIG. 1( a )  and,  FIG. 1( b )  to  FIG. 3 , is provided with a display part  1 , a translucent plate  2 , an anti-reflection part  3 , a casing  4 , a facing member  5 , a packing  6 , and a bezel  7 . 
     The display part  1  displays the amount of measurement such as the vehicular speed described previously, and is provided with an indicator  10 , a character plate  11 , a circuit board  12 , and a middle casing  13 . 
     The indicator  10  is rotatable on a front side of the character plate  11 , and indicates a pointer part  11   a  (refer to  FIG. 1( a )  formed on the character plate  11 . The pointer part  11   a  is composed of scale, numeric values or the like. The display part  1  compares and reads the indicated part of the indicator  10  and the pointer part  11   a  to thereby broadcast the amount of measurement to a user. The indicator  10  is formed of a light guide member in at least a part thereof, and can emit light by receiving the light from light sources L 1 , L 2  so as to be thereby able to emit the light. Also, the pointer part  11   a  is formed having light transmissibility, and can emit light by receiving the light from a character plate light source L 3 . 
     The circuit board  12  is made of a printed circuit board on which a motor  14  (for example, stepping motor) that rotationally drives the indicator  10 ; light sources L 1 , L 2  illuminating the indicator  10 ; and a character plate light source L 3  illuminate the character plate  11  or the like are implemented. A motor  14  rotates, according to the amount of measurement, the indicator  10  mounted to a rotary shaft  14   a  thereof. 
     The parts implemented on the circuit board  12  operate under the control of a control part which is not shown. The control part is composed of a microcomputer or the like, and acquires data indicative of various amounts of measurement from a variety of sensors such as a vehicular speed sensor. Based on the thus acquired data, the control part drives the motor  14 , and rotates the indicator  10  by a rotation angle according to the amount of measurement such as the vehicular speed. The control part also controls lighting of the light sources L 1 , L 2  and the character plate light source L 3 . 
     The middle casing  13  is positioned between the character plate  11  and the circuit board  12 , and supports the character plate  11 . The middle casing  13  is formed of predetermined resin in white, for example, and has an illumination chamber  13   a  that efficiently guides, to the character plate, the light emitted from the light sources L 1 , L 2 . A light guiding member  15  that guides, to the indicator  10 , the light emitted from the light sources L 1 , L 2 , are provided farther toward the rotary shaft  14   a  side than an illumination chamber  13   a.    
     The translucent plate  2  is made of light transmissible resin such as PMMA (polymethylmethacrylate resin), and is located on a front side of the display part  1 . The translucent plate  2 , as shown in  FIG. 1( a ) , is formed in a circular shape in a planar view. 
     The anti-reflection part  3 , as shown in an enlarged manner in  FIG. 2 , is a film (sheet) which is configured by an irregular layer  31  of a moth&#39;s eye structure being coated on a film-shaped substrate  30 . The anti-reflection part  3  is secured to come into intimate contact with a rear face of the translucent plate  2  by way of an adhesive S having high transparency. The anti-reflection part  3  may be fused and secured to the translucent plate  2  when the translucent plate  2  is subjected to injection molding. 
     The anti-reflection part  3  is formed in a circular shape which is somewhat smaller than the translucent plate  2  so as to avoid an access to an end part  2   a  of the translucent plate  2  (refer to  FIG. 3 ). A region for forming the anti-reflection part  3  will be described later in detail. 
     The substrate  30  is formed of resin such as triacetylcellulose (TAC), polyethylene terephthalate (PET), or polycarbonate (C). As a substrate  30 , a material having a thickness of the order of 5 to 300 microns and superior optical characteristics is selected. 
     An irregular layer  31  is formed in the moth&#39;s eye structure, and is configured by a plurality of conical protrusions  31   a  being arrayed in a two-dimensional manner (along the rear face of the substrate  30 ) in array pitches, each of which is equal to or less than the wavelength of visible light. 
     Although the array pitch P of the conical protrusions  31   a  is not limited in particular as long as the pitch is equal to or less than the wavelength of visible light, these conical protrusions are formed so as to have an appropriate value according to the purpose because the wavelength dependency of reflectance is affected. The array pitch is set to the order of 100 nm, for example. The array pitch can be appropriately changed in the range of several tens of nm to several hundreds of nm. For example, height H is of the order of several hundreds of nm. A height H of a conical protrusion  31   a  influences wavelength dependency of reflectivity and thus is formed so as to have an appropriate value according to the purpose. For example, the height H is of the order of several hundreds of mm. 
     The term “conical” in the conical protrusion(s)  31 A does not mean only a perfect cone or a truncated cone, it is sufficient if the shape is approximately a conical shape, and it is also sufficient if the shape is a tapered shape (sectional wedge shape). Also, a tip end part of a conical protrusion  31   a  may be a curved shape as shown in  FIG. 2 , and may not be sharpened up. In addition, the tip end part of the conical protrusion  31   a  can also be flattened. The conical protrusion  31   a  needs to be formed at least in the tapered shape in order to obtain the moth&#39;s eye structure, and the details in the structure can be appropriately changed according to the manufacturing constraint or purpose. 
     The anti-reflection part  3  is manufactured by forming, on the substrate  30 , a resin layer having a photocurable property (such as a UV (Ultraviolet) property or an EB (Electron Beam photocurable property) and thereafter transferring the moth&#39;s eye shape by a stamper and further curing the resin layer by light irradiation to thereby form an irregular layer  31 . It is preferable that the irregular layer  31  be formed having hydrophilicity as described later. 
     The anti-reflection part  3  utilizing the moth&#39;s eye structure is thus provided on the translucent plate  2 , so that a refractive index can be varied as to the light incident from the outside of the gauge  100  and transmitted from the translucent plate  2  to an air layer between the translucent plate  2  and the display part  1  (it is possible to avoid generation of a discontinuous interface for the refractive index). Therefore, interfacial reflection of the incident light on the rear face of the translucent plate  2  is restrained, reflection of an external scene and solar light and illumination is reduced, and visibility of the display part  1  is improved. Also, in the translucent plate  2  on which the anti-reflection part  3  has been thus provided, transmissibility of the light that has been emitted from the display part  1  (the illumination light of the indicator  10  or the illumination light of the character plate  11 ) increases and thus there is no need to increase the light emission luminance of the light sources L 1 , L 2  or the character plate light source L 3 , and power consumption of the gauge  100  can be restrained. 
     An AR (Anti-Reflective) coating may be applied to a front face of the translucent plate  2  so as to further obtain a reflection reduction effect. The AR coating is formed by a technique for vacuum vapor deposition such as magnesium fluoride, for example, 
     The casing  4  is formed of resin or metal or the like in a shape of a bottomed cylinder, and houses the display part  1 . As shown in  FIG. 3 , at an open end of the casing  4 , a flange  4   a  protruding in an outer diameter direction of the casing  4  is formed. 
     The facing member  5  is provided as an example of a defining member of the present invention, is formed of predetermined resin or the like in black for example, and is intended to cover an unrequired part inside the gauge  100 . By the facing member  5 , as shown in  FIG. 3 , a display region D 1  of the display part  1  is defined. The facing member  5  is located between the display part  1  and the translucent plate  2 , and is provided so as to surround an outer circumferential part of the display part  1 . 
     The facing member  5 , as shown in  FIG. 3 , has: a supporting part  50  that supports an end part  2   a  of the translucent plate  2 ; a diagonal fall part  51  that diagonally falls toward the display part  1 ; and a bent part  52  formed so as to be bent from the supporting part  50  and connecting the supporting part  50  and the diagonal fall part  51  to each other. 
     The supporting part  50  is a circumferential part which is supported by the flange  4   a  of the casing  4 . At an upper end of the supporting part  50 , a step difference  50   a  is formed to be aligned with the end part  2   a  of the translucent plate  2 , and on the step difference  50   a , the translucent plate  2  is placed. 
     The diagonal falling part  51  forms a shape of a conical cylinder. The diagonal falling part  51  diagonally falls toward the character plate  11  of the display part  1  through a bent part  52  from an upper end part of the supporting part  50 . A tip end of the diagonal falling part  51  is located to be slightly spaced from the character plate  11 , and does not abut against anything. 
     As shown in  FIG. 3 , the diagonal fall part  51  is located in a region D 2  which is adjacent to the display region D 1 . Also, the bent part  52  is positioned in a region D 3  which is adjacent to the region D 2 . In addition, the end part  2   a  of the translucent plate  2  to be clamped by a clamp part  8  which will be described later is located in a region D 4  which is adjacent to the region D 3 . In summary, these regions are located in sequential order of the display region D 1 , the region D 2 , the region D 3 , and the region D 4  from a center of the display part  1  toward an outer diameter direction. 
     The packing  6  is made of an elastic member (such as elastomer) which is formed in a shape of a circular ring so as to be taken along the end part  2   a  of the circular translucent plate  2 . The packing  6 , as shown in  FIG. 3 , forms a sectional substantial L-shape, and covers a front face of the end part  2   a  of the translucent plate  2  and a part of a side face. 
     In the present embodiment, the packing  6  and the facing member  5  constitute the clamp part  6  for clamping the end part  2   a  of the translucent plate  2 . The clamp part  8 , as described later, is swaged from the outer circumferential side by way of a bezel  7 . 
     Although the clamp part  8  and the anti-reflection part  3  are mainly described with reference to  FIG. 3 , the clamp part  8  and the anti-reflection part  3  are formed so as to be approximately rotationally symmetrical to the vicinity of a center axle (the axle taken along a rotary shaft  14   a ) of the display part  1  and thus the shape in a case where the clamp part  8  and the anti-reflection part  3  are cut in an arbitrary cross section passing through the axle is approximately similar to the shape shown in  FIG. 3 . 
     Of the packing  6 , at a part covering the front face of the end part  2   a  of the translucent plate  2 , a rib  6   a  protruding toward the end part  2   a  is formed. If the clamp part  8  is swaged by the bezel  7 , the translucent plate  2  is mainly clamped by the rib  6   a  and the supporting part  50  (step difference  50   a ). At the front side of the packing  6 , a groove  6   b  is formed so as to correspond to the rib  6   a . The groove  6   b  is provided to appropriately keep a pressure or the like applied from the packing  6  to the translucent plate  2  when the clamp part  8  is swaged. 
     Of the packing  6 , a part covering a side ace of the end part  2   a  of the translucent plate  2  is a hanging part  6   c  that hangs toward a top face of the supporting part  50  of the facing member  5 . If the clamp part  8  is swaged, the supporting part  50  and the hanging part  6   c  come into intimate contact with each other. 
     The bezel  7  is a frame member made of a metal for example, and as shown in  FIG. 1 , is formed in the shape a circular ring in a planar view. The bezel  7  is swaged and secured (swaging and securing) so as to clamp an open end (flange  4   a ) of the casing  4  and the clamp part  8  (facing member  5  and packing  6 ). In this manner, a force of clamping the translucent plate  2  by the clamp part  8  is applied and the clamp part  8  for clamping the translucent plate  2  is secured to the casing  4 . 
     (Region for Forming Anti-Reflection Part) 
     Hereinafter, with reference to  FIG. 3 , a region for forming the anti-reflection part  3  will be described. 
     In the gauge  100  of the present embodiment, the anti-reflection part  3  is provided so as to avoid an access to the end part  2   a  of the translucent plate  2  clamped by the clamp part  8 , and is provided so as not to come into contact with the clamp part  8 . Specifically, between an end face of the anti-reflection part  3  and the end part  2   a  of the translucent plate  2 , an appropriate clearance (equivalent to a width of the region D 3 ) is provided. By doing so, it is possible to prevent coming into contact with exterior parts, releasing, or entry of air bubbles into the anti-reflection part  3  owning to thermal expansion or the like. 
     Also, a tip end of the diagonal fall part  51  (the boundary between the display region D 1  and the region D 2 ) is located farther toward a central side of the display part  1  than a circumferential end of the anti-reflection part  3 . According to this positional relationship, a circumferential end of the anti-reflection part  3  overlaps the facing member  5 . Thus, it is possible to restrain the end face of the anti-reflection part  3  from being visually recognized in a linear shape through the translucent plate  2 , and degradation of the appearance can be restrained. 
     In addition, when seen in the thickness direction of the gauge  100  (the vertical direction of  FIG. 3 ), the boundary between the bent part  52  and the diagonal fall part  51  (the boundary between the region D 3  and the region D 2 ) is aligned with the circumferential end of the anti-reflection part  3 . According to this positional relationship, corners of the bent part  52  and the diagonal fall part  51  are located immediately beneath the circumferential end of the anti-reflection part  3  and thus it is possible to more appropriately restrain the end face of the anti-reflection part  3  from being visually recognized in a linear shape through the translucent plate  2 . 
     Further, when seen in the thickness direction of the gauge  100 , an end at a front side of the bezel  7  is located farther toward a central side of the display part  1  than a circumferential end of the anti-reflection part  3 . That is, the end (tip end) at the front side of the bezel  7  is located farther toward a side of the region D 2  than the boundary between the region D 3  and the region D 2 . By doing this, even if the display part  1  is seen at a somewhat diagonal angle, the end face of the anti-reflection part  3  is made inconspicuous and thus degradation of the appearance can be restrained more appropriately. The end at the front side of the bezel  7  may be at the same place as that of the circumferential end of the anti-translucent part  3 . 
     It is preferable that the irregular layer  31  be formed having hydrophilicity to secure an anti-fog performance together with an anti-reflection performance exerted by the moth&#39;s eye structure. This is because owing to a synergetic effect between wettability exerted by being composed of hydrophilic resin and the moth&#39;s eye structure, even if the water made by agglutination of the moisture that is present in the gauge  100  is formed on the rear face of the translucent plate  2 , fine water droplets are not obtained in particle size (several microns to several tens of microns) to an extent such that light is randomly reflected and it is possible to prevent a contact angle from being held in the state of an acute angle, and it is possible to prevent the layer from being visually recognized whitely as being cloudy. As a result, it is also possible to attain a certain dustproof effect to an extent such that coating of an anti-fog agent is unrequired. In order to attain such a dustproof effect together with the anti-fog effect, for example, it is sufficient if the irregular layer  31  is composed of a material containing hydrophilic polymer (such as protein or polyester amide) in UV curable resin or a material using an optical catalyst (titanium oxide) which exhibits hydrophilicity at the time of UV irradiation or the like. 
     Hereinafter, a gauge  200  according to a second embodiment, which is different from that of the first embodiment in configuration of the clamp part for clamping the translucent plate  2 , will be mainly described with reference to  FIG. 4 .  FIG. 4  is an enlarged view of a part equivalent to portion C shown in  FIG. 1( b )  in the gauge  200 . Hereinafter, for the sake of a clear understanding of the configuration, constituent elements associated with the features of the second embodiment are designated by new reference numerals, and other constituent elements are designated by same reference numerals as those of the first embodiment, and further, the descriptive matters different from those of the first embodiment will be mainly described. 
     Second Embodiment 
     In the gauge  200  according to the second embodiment, packing  206  and a facing member  205  constitute a clamp part  208  for clamping an end part  2   a  of a translucent plate  2 . The clamp part  208  is swaged from the outer circumferential side by way of a bezel  7 . 
     In the second embodiment, the facing member  205  does not abut against the translucent plate  2 , and clamps the end part  2   a  of the translucent plate  2  via the packing  206 . In the present specification, a configuration in which the facing member  205  works cooperatively with the packing  206  to indirectly clamp the translucent plate  2  is also included in an expression that the clamp part  208  clamps the translucent plate  2 . 
     The packing  206  is made of an elastic member (such as elastomer) which is formed in a shape of a circular ring so as to be taken along the end part  2   a  of the circular translucent plate  2 . The packing  206 , unlike the first embodiment, forms a sectional U-shape, and covers the end part  2   a  of the translucent plate  2  so as to clamp it. In the packing  206  according to the second embodiment, a rib  6   a  and a groove  6  as in the first embodiment are not provided (however, they may be provided a required). 
     The facing member  205  is provided as an example of a defining member of the present embodiment, and defines a display region D 1  of a display part  1 . The facing member  205  has: a supporting part  250  that supports the packing  206  covering the end part  2   a  of the translucent plate  2 ; a diagonal fall part  251  that diagonally falls toward the display part  1 ; and a bent part  252  formed so as to be bent from the supporting part  250  and connecting the supporting part  250  and the diagonal fall part  251  to each other. 
     The supporting part  250  is a disk-shaped part which is supported by a flange  4   a  of a casing  4 . The diagonal fall part  251 , as in the first embodiment, forms the shape of a conical cylinder. The bent part  252  has a curved face and forms an R-shape and then connects the supporting part  250  and the diagonal fall part  251  to each other more smoothly than that of the first embodiment. 
     The diagonally falling part  251  is located in a region D 2  which is adjacent to a display region D 1 . Also, the bent part  252  is located in a region D 3  which is adjacent to the region D 2 . In addition, an end part  2   a  of a translucent plate  2  which is clamped by the clamp part  208  is located in a region D 4  which is adjacent to the region D 3 . 
     A bezel  7  swages and secures an open end (flange  4   a ) of a casing  4  and the clamp part  208  (facing member  205  and packing  206 ) so as to clamp them. In this manner, a force of clamping the translucent plate  2  by the clamp part  208  is applied and the clamp part  208  for clamping the translucent plate  2  is secured to the casing  4 . 
     (Region for Forming Anti-Reflection Part) 
     In the gauge  200  of the second embodiment as well, an anti-reflection part  3  is provided to avoid an access to the end part  2   a  of the translucent plate  2  clamped by the clamp part  208 , and is provided so as to not come into contact with the clamp part  208 . Specifically, between an end face of the anti-reflection part  3  and the end part  2   a  of the translucent plate  2 , an appropriate clearance (equivalent to a width of the region D 3 ) is provided. Thus, as in the first embodiment, it is possible to prevent a release of the anti-reflection part  3  or entry of air bubbles into the anti-reflection part  3 . 
     Also, a tip end of the diagonal fall part  251  (the boundary between the display region D 1  and the region D 2 ) is located farther toward a central side of the display part  1  than a circumferential end of the anti-reflection part  3 . Thus, as in the first embodiment, it is possible to restrain the end face of the anti-reflection part  3  from being visually recognized in a linear shape through the translucent plate  2 , and it is possible to restrain degradation of the appearance. 
     In addition, when seen in the thickness direction of the gauge  200 , the boundary between the bent part  252  and the diagonal fall part  251  (the boundary between the region D 3  and the region D 2 ) is aligned with the circumferential end of the anti-reflection part  3 . The boundary is equivalent to a part leading from the R-shaped bent part  252  to the diagonal fall part  251  that is approximately formed in a linear shape in a sectional view as shown in  FIG. 4 , in the front face of the bend part  252  and the diagonal fall part  251 . According to this positional relationship as well, the boundary between the bent part  52  and the diagonally falling part  51  is located immediately beneath the circumferential end of the anti-reflection part  3  and thus it is possible to more appropriately restrain the end face of the anti-reflection part  3  from being visually recognized in a linear shape through the translucent plate  2 . 
     In the second embodiment, when seen in the thickness direction of the gauge  200 , the end at the front side of the bezel  7  is located farther toward the outer circumferential side than the circumferential end of the anti-reflection part  3 . That is, this is a configuration which does not actively cover the end face of the anti-reflection part  3  with the bezel  7 . Unlike the first embodiment, this configuration may be more acceptable. 
     In the configuration of the second embodiment as well, the end at the front side of the bezel  7  is located farther toward the central side of the display part  1  than the circumferential end of the anti-reflection part  3 . Alternatively, by obtaining coincidence with the circumferential end of the anti-reflection part  3 , the end face of the anti-reflection part  3  is made more inconspicuous, and degradation of the appearance may be restrained more appropriately. 
     The present invention is not limitative to the above embodiments and drawings. Appropriate modifications (including deletion of the constituent elements) can occur without departing from the spirit of the present invention. 
     Modification Example 
     Although the foregoing descriptive matters were furnished as to examples in which the display part  1  is composed of an indicator-type gauge, the display part  1  that is visually recognized through the translucent plate  2  may be an image display device for displaying an image indicative of the amount of measurement. The image display device may be a liquid crystal display (LCD: Liquid Crystal Display) or an organic EL Electro-Luminescence) display or the like. Display of the amount of measurement by the image display device includes an aspect intended to cause a user to compare and read the measured values by displaying a bar graph or a guidance image as well as an aspect intended to specifically display the measured values by way of numeric values or characters. 
     Also, the shape of the translucent plate  2  and the anti-reflection part  3  is not limited to the circular shape. The shape may be an elliptical shape, a rectangular shape, a polygonal shape or the like. 
     Transportation means in which the gauges  100 ,  200  are incorporated are not limited to vehicles (including four-wheel motor vehicles, motor bicycles or the like). These gauges may be incorporated in other transportation means such as agricultural machines, ships, aircrafts, snow mobiles, or jet skis). In addition, the gauges  100 ,  200  may be air pressure gauges to be installed outside, for example, and may not be incorporated in transportation means. 
     In the following description, for the sake of a clear understanding of the present invention, a description of technical matters which are publicly known is appropriately omitted. 
     INDUSTRIAL APPLICABILITY 
     The present invention is applicable to a gauge, and in particular is suitable for a gauge which is provided with an anti-reflection part having fine conical protrusions. 
     DESCRIPTION OF REFERENCE NUMERALS 
     
         
           100 ,  200 : Gauges 
           1 : Display part 
           2 : Translucent plate 
           2   a : End part 
           3 : Anti-reflection part 
           30 : Substrate 
           31 : Irregular layer 
           31   a : Conical protrusion 
           4 : Casing 
           4   a : Flange 
           5 ,  205 : Facing members (example of defining member) 
           50 ,  250 : Supporting parts 
           51 ,  251 : Diagonal fall parts 
           52 ,  252 : Bent parts 
           6 ,  206 : Packings 
           7 : Bezel 
           8 ,  208 : Clamp parts