Vehicular sunshade device

Abstract

To provide a vehicular sunshade device that can reduce energy loss due to air-conditioning work to elongate a distance to empty of a vehicle.SOLUTION: A vehicular sunshade device 100 according to the present invention comprises an openable / closable window glass 4 that can move between a closing position where an opening part 3a of a window frame 3 of a roof 2 of a vehicle 1 is closed and an opening position where the opening part 3a of the window frame 3 is opened, and a shade part 10 that is arranged in the vehicle 1 to cover the opening part 3a of the window frame 3. The shade part 10 has a sheet-like shade base material 12 having a predetermined thickness T and a plurality of ventilation holes 15 penetrating through the base material 12. In a planar view, the shade part 10 has a vehicle front-side region part RF and a vehicle rear-side region part RR, which is formed so that aperture areas of the ventilation holes on an upper surface of the base material 12 are smaller in the vehicle rear-side region part RR than in the vehicle front-side region part RF.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a sunshade device for a vehicle, and more particularly to a sunshade device for a vehicle that is provided in a vehicle having an openable and closable window glass. [Background technology]

[0002] In recent years, electric vehicles using electric motors instead of internal combustion engines as their drive source have been developed. One of the challenges in the development of electric vehicles in recent years is extending their driving range. One possible solution to this problem is to equip the vehicle with large-capacity storage batteries so that it can store a large amount of consumable energy. However, installing a large number of storage batteries increases the vehicle weight and manufacturing costs, which are problems.

[0003] In response to this, the inventors have been developing a system to reduce vehicle energy loss, focusing on the energy loss due to air conditioning work among various types of energy loss. In other words, in order to reduce the air conditioning work, when lowering the passenger compartment temperature, it is desirable to suppress the operation of the air conditioning device by ventilating between the outside air and the inside air and adjusting the amount of solar radiation entering the passenger compartment.

[0004] Meanwhile, a technology for providing a sunshade to a vehicle to reduce the amount of sunlight entering the vehicle through the window glass is known. For example, Patent Document 1 discloses a sunshade provided on a door window, in which a sheet-like base material has many through-holes formed therein to improve visibility, and a metal coating is further formed on the exterior surface of the base material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-292297 Summary of the Invention [Problem to be solved by the invention]

[0006] However, while the shade in Patent Document 1 can prevent sunlight from entering the vehicle interior to a certain extent, the shade also inhibits ventilation within the vehicle interior. Therefore, simply installing a sunshade on the window glass in a vehicle makes it difficult to reduce energy loss due to air conditioning work and extend the driving range.

[0007] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a sunshade device for a vehicle that can reduce energy loss due to air conditioning work and extend the vehicle's driving range. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a sunshade device for a vehicle, comprising an openable / closable window glass that can be moved between a closed position that closes an opening in a window frame on the roof of the vehicle and an open position that opens the opening in the window frame, and a shade portion that is arranged inside the vehicle to cover the opening in the window frame, wherein the shade portion has a sheet-shaped base material having a predetermined thickness and a plurality of ventilation holes that penetrate the base material, and the shade portion has, in a plan view, a vehicle front region and a vehicle rear region, and the opening area of ​​the ventilation holes on the upper surface of the base material is formed smaller in the vehicle rear region than in the vehicle front region.

[0009] According to the present invention configured as described above, the opening area of ​​the ventilation holes on the upper surface of the base material is smaller in the vehicle rear region than in the vehicle front region, so that outside air is preferentially drawn into the vehicle cabin from the vehicle front region compared to the vehicle rear region, and an air flow is formed in which the inside air flows from the front to the rear within the vehicle cabin and is discharged outside the vehicle from the vehicle rear region, thereby improving ventilation efficiency. Furthermore, in the past, incident light was blocked to some extent by frames or the like located above the heads of occupants such as the driver in the front of the vehicle cabin, making it difficult for front seat occupants to be exposed to incident light. However, in the rear of the vehicle cabin, incident light was easily exposed to rear seat occupants because there was no light blocking by frames or the like. However, in the present invention, the opening area of ​​the ventilation holes on the upper surface of the base material is smaller in the vehicle rear region, suppressing incident light from entering the vehicle cabin and thereby making it difficult for rear seat occupants to be exposed to incident light. As a result, by using the vehicle sunshade device of the present invention, occupants can suppress the operation of the air conditioning device, thereby reducing energy loss due to air conditioning work and extending the vehicle's driving range.

[0010] In the present invention, preferably, the vehicle front region is provided at least above a driver's seat and / or a passenger seat of the vehicle, and the vehicle rear region is provided at least above a rear seat of the vehicle. According to the present invention configured in this manner, outside air is taken in from above through the vehicle front region toward the driver in the front, and inside air moves toward the rear passengers, and then the inside air is discharged from above the rear passengers to the outside of the vehicle through the vehicle rear region.

[0011] In the present invention, preferably, the ventilation holes are formed in the vehicle rear region such that the opening area of ​​the upper surface of the base material is smaller than the opening area of ​​the lower surface of the base material. According to the present invention configured in this manner, in the vehicle rear region, the smaller opening area of ​​the upper surface of the ventilation holes makes it easier to block incident light, and the larger opening area of ​​the lower surface of the ventilation holes makes it easier to take in interior air from the vehicle cabin for exhaust.

[0012] In the present invention, preferably, the ventilation holes are formed in the vehicle front region such that the opening area of ​​the upper surface of the base material is larger than the opening area of ​​the lower surface of the base material. According to the present invention configured in this manner, in the vehicle front region, the larger opening area of ​​the upper surface of the ventilation holes makes it easier to take in outside air while driving, and the smaller opening area of ​​the lower surface of the ventilation holes makes it possible to increase the flow rate of the outside air taken in from outside and introduce it into the vehicle cabin.

[0013] In the present invention, preferably, the ventilation holes have a shape of a polygonal pyramid or a circular truncated cone. Also, in the present invention, preferably, the number of ventilation holes per unit area is formed in the vehicle front region and the vehicle rear region is approximately the same. According to the present invention configured in this way, it is easy to form an air flow that takes in outside air into the vehicle cabin from the vehicle front region and expels inside air to the outside of the vehicle from the vehicle rear region while driving.

[0014] In the present invention, the base material is preferably formed so that its thickness is thinner in the vehicle rear region than in the vehicle front region. According to the present invention configured in this manner, the flow resistance of the ventilation holes in the vehicle rear region is reduced, making it easier to discharge inside air from the vehicle rear region to the outside.

[0015] In the present invention, the opening area of ​​the ventilation hole is preferably formed so as to decrease as the thickness of the base material decreases. According to the present invention configured in this manner, it is possible to further suppress the incidence of incident light into the vehicle interior while maintaining good ventilation efficiency at the ventilation hole.

[0016] In the present invention, preferably, the vehicle has at least a driver's seat and a passenger seat, and the shade portion has, in a plan view, an occupant area including a driver's seat area extending in the front-to-rear direction of the vehicle above the driver's seat and a passenger seat area extending in the front-to-rear direction of the vehicle above the passenger seat, and a non-occupant area extending in the front-to-rear direction of the vehicle between the driver's seat area and the passenger seat area, and the ventilation holes are formed in the upper surface of the base material with approximately the same opening area in the front and rear regions of the non-occupant area. According to this configuration, the entire shade portion can take in more outside air into the vehicle cabin while driving. Furthermore, according to the present invention, since inside air is exhausted from the occupant area in the rear region of the vehicle, an inside air flow is formed in the vehicle cabin in the width direction of the vehicle as well as the front-to-rear direction of the vehicle, making it easier to form an inside air flow near the occupants. [Effects of the Invention]

[0017] According to the sunshade device for a vehicle of the present invention, it is possible to reduce the energy loss due to air conditioning work and extend the driving range of the vehicle. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a plan view of a vehicle according to an embodiment of the present invention. [Figure 2] 1 is a side view of a vehicle according to an embodiment of the present invention. [Figure 3] 1 is an explanatory diagram of a vehicle sunshade device according to an embodiment of the present invention; [Figure 4] FIG. 2 is an explanatory diagram of a planar area of ​​a shade part according to the first embodiment of the present invention. [Figure 5] FIG. 2 is an explanatory diagram of a shade part according to the first embodiment of the present invention. [Figure 6] 4 is a graph showing the change in ventilation flow rate relative to the ratio of opening dimensions according to the first embodiment of the present invention. [Figure 7] FIG. 10 is a partial plan view of a shade according to a second embodiment of the present invention. [Figure 8] FIG. 10 is an explanatory diagram of a cross section of a shade part according to a second embodiment of the present invention. [Figure 9] FIG. 10 is an explanatory diagram of a shade part according to a third embodiment of the present invention. [Figure 10] 10 is a graph showing the change in ventilation flow rate with respect to the ratio of opening size to thickness according to the third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] [Overall configuration of the device] A vehicle sunshade device according to an embodiment of the present invention will now be described with reference to the accompanying drawings. First, the overall configuration of a vehicle sunshade device according to an embodiment of the present invention will be described with reference to Figs. 1 to 3. Fig. 1 is a plan view of a vehicle, Fig. 2 is a side view of the vehicle, and Fig. 3 is an explanatory diagram of the sunshade device. In this embodiment, the sunshade device of the present invention is applied to a sunroof provided on the roof of the vehicle. In the various embodiments below, for ease of understanding, the same elements are designated by the same reference numerals, and redundant explanations will be omitted. Also, for ease of understanding, the scale and dimensional relationships in the drawings are not necessarily accurate.

[0020] As shown in FIG. 1, a vehicle 1 has a roof 2 provided with a window frame 3. The window frame 3 has an opening 3a that is substantially rectangular in plan view. A transparent, translucent, or opaque window glass 4 is removably attached to the window frame 3. That is, the window glass 4 is configured to be movable between a closed position that closes the opening 3a of the window frame 3 and an open position that opens the opening 3a. An occupant can operate an actuator such as an electric motor by operating a controller (not shown), thereby opening and closing the window glass 4 between the closed position and the open position (see FIG. 3).

[0021] The sunshade device 100 includes a window glass 4 and a shade unit 10 arranged in the vehicle 1 so as to at least partially or completely cover the opening 3a of the window frame 3, regardless of the front or rear position of the window glass 4. In this embodiment, the shade unit 10 is a sheet-like member having a predetermined thickness and made of a flexible resin material or the like, and is normally stored in a wound state around a roller 31. By operating a controller (not shown), an occupant can activate an actuator 33 such as an electric motor to pull the shade unit 10 from the roller 31 along a rail. The shade unit 10 can be pulled from a storage position, where it is stored on the roller 31, to a shielding position, where it covers the opening 3a. Alternatively, the shade unit 10 may be pulled from the roller 31 by the occupant manually pulling the tip.

[0022] [First embodiment] Next, the sunshade device 100 according to the first embodiment will be described with reference to Figs. 4 to 6. Fig. 4 is an explanatory diagram of the planar area of ​​the shade part, Fig. 5 is an explanatory diagram of the shade part, and Fig. 6 is a graph showing the change in ventilation flow rate relative to the ratio of opening dimensions. Fig. 5 shows a schematic diagram of the structure of the shade part 10. For ease of understanding, the number of ventilation holes 15 formed in the vehicle longitudinal direction Y is not accurate in Fig. 5. The same applies to the following figures.

[0023] As shown in Fig. 4, in this embodiment, the shade unit 10 is divided into a plurality of planar regions. Fig. 4 is a plan view of the shade unit 10 in the shielding position, and the shade unit 10 is divided in the vehicle width direction X (lateral direction) into a driver's seat region RP1 extending from a position corresponding to above the driver's seat in the vehicle longitudinal direction Y, a passenger seat region RP2 extending from a position corresponding to above the passenger seat in the vehicle longitudinal direction Y, and a central region RN sandwiched between these regions. The driver's seat region RP1 and the passenger seat region RP2 are collectively referred to as the passenger region RP, and the central region RN is also referred to as the non-passenger region RN.

[0024] The driver's seat area RP1, passenger seat area RP2, and central area RN are each divided into a vehicle front area RF and a vehicle rear area RR in the vehicle longitudinal direction Y. Therefore, the driver's seat area RP1 includes a vehicle front area RF that includes a position above the driver P0 in the driver's seat, and a vehicle rear area RR that includes a position above the occupant P1 in the seat behind the driver's seat. Similarly, the passenger seat area RP2 includes a vehicle front area RF that includes a position above the occupant P2 in the passenger seat, and a vehicle rear area RR that includes a position above the occupant P3 in the seat behind the passenger seat. Similarly, the central area RN also includes a vehicle front area RF and a vehicle rear area RR corresponding to the driver's seat area RP1 and passenger seat area RP2.

[0025] Fig. 5(A) is a schematic top view showing the arrangement of ventilation holes 15 formed along the vehicle longitudinal direction Y. Fig. 5(B) is a cross-sectional view of Fig. 5(A). Fig. 5 shows the structure of the shade portion 10 of this embodiment in a schematic manner for ease of understanding, and the vertical and horizontal dimensions and the number of ventilation holes are not accurate. Therefore, in reality, a large number of ventilation holes 15 are formed in a matrix in the X and Y directions of the shade portion 10.

[0026] In this embodiment, the shade portion 10 has a base material 12, which is a flexible sheet member having a predetermined thickness T, and a plurality of ventilation holes 15 penetrating the base material 12. The thickness T is typically 0.5 mm to 5.0 mm. Each of the above-mentioned regions may have ventilation holes of different sizes and shapes formed relative to the other regions.

[0027] 5(A) is a partial plan view of the shade portion 10 in the vehicle front region RF and the vehicle rear region RR. In this embodiment, a plurality of ventilation holes 15 are arranged at predetermined intervals (equally spaced in this embodiment) in the X direction and the Y direction in the base material 12. Therefore, the number of ventilation holes 15 per unit area is approximately equal in the vehicle front region RF and the vehicle rear region RR.

[0028] However, ventilation holes 15 with different three-dimensional shapes are formed in the front region RF of the vehicle and the rear region RR of the vehicle (or they have the same three-dimensional shape but are opposite in the vertical direction). That is, in the front region RF of the vehicle, a ventilation hole 15 in the shape of a truncated cone is formed where the upper surface opening dimension (diameter) Df1 is larger than the lower surface opening dimension Df2 (Df1 > Df2). On the other hand, in the rear region RR of the vehicle, a ventilation hole 15 in the shape of a truncated cone is formed where the upper surface opening dimension Dr1 is smaller than the lower surface opening dimension Dr2 (Dr1 < Dr2). In this embodiment, the thickness T of the base material *********** is constant, Df1 is equal to Dr2 (Df1 = Dr2), and Df2 is equal to Dr1 (Df2 = Dr1). Therefore, the ventilation holes 15 in the front region RF of the vehicle and the ventilation holes 15 in the rear region RR of the vehicle have the same volume. In this embodiment, the ventilation hole 15 is in the shape of a truncated cone, but it may also be in other shapes such as a truncated square pyramid shape or other polygonal pyramid shapes.

[0029] Also, FIG. 6 shows the simulation results of the ventilation volume through the shade in the driving state. In this computer experiment, it is assumed that the vehicle 1 is traveling at a predetermined speed (for example, 50 km / h) and a predetermined driving wind is blowing from the front to the rear on the shade. The ventilation hole has an upper surface opening dimension D1 and a lower surface opening dimension D2. The horizontal axis in FIG. 12 represents D1 / D2 (the volume of the ventilation hole is constant), and the vertical axis represents the ventilation flow rate (kg / s). The ventilation flow rate is the air flow rate (ventilation flow rate) between the inside and outside of the vehicle cabin.

[0030] Referring to FIG. 6, it can be seen that when D1 is larger than D2 (D1 > D2) rather than D1 being equal to D2 (D1 = D2), the ventilation flow rate into the vehicle increases. Therefore, when taking in outside air A0 into the vehicle cabin, it is preferable to set the upper surface opening dimension D1 of the ventilation hole to be larger than the lower surface opening dimension D2 (D1 > D2). Also, when discharging the inside air A1 to the outside of the vehicle, it is preferable to set the upper surface opening dimension D1 of the ventilation hole to be smaller than the lower surface opening dimension D2 (D1 < D2).

[0031] It should be noted that there is an unclear part "母材12の厚みTは一定であり、Df1はDr2と等しく(Df1=Dr2)、Df2はDr1と等しい(Df2=Dr1). 母材12の厚みTは一定であり、Df1はDr2と等しく(Df1=Dr2)、Df2はDr1と等しい(Df2=Dr1). " in the original text. I've translated it as best as possible while keeping the unclear part intact. You may need to check and correct it according to the actual situation.Therefore, in this embodiment, the ventilation hole 15 in the front vehicle region RF is set such that the opening dimension (or opening area) on the upper surface is larger than that on the lower surface of the base material 12 (Df1 > Df2). On the other hand, the ventilation hole 15 in the rear vehicle region RR is set such that the opening dimension (or opening area) on the lower surface is larger than that on the upper surface of the base material 12 (Dr1 < Dr2). Further, the upper surface opening dimension Df1 (or upper surface opening area) of the ventilation hole 15 in the front vehicle region RF is formed larger than the upper surface opening dimension Dr1 (or upper surface opening area) of the ventilation hole 15 in the rear vehicle region RR. Therefore, in the front vehicle region RF, the upper surface opening area per unit area of the ventilation hole 15 is formed larger than that in the rear vehicle region RR.

[0032] With this configuration, in this embodiment, during traveling, outside air A0 is efficiently taken into the vehicle interior preferentially from the front vehicle region RF rather than from the rear vehicle region RR, and inside air A1 is efficiently discharged to the outside of the vehicle preferentially from the rear vehicle region RR rather than from the front vehicle region RF. Therefore, in this embodiment, the shade portion 10 can efficiently ventilate the vehicle interior by forming a flow that takes in outside air A0 from the front vehicle region RF into the vehicle interior and discharges inside air A1 from the rear vehicle region RR to the outside of the vehicle.

[0033] Also, with this configuration, in this embodiment, in the front vehicle region RF and the rear vehicle region RR, even if the volume of the ventilation hole 15 is the same, the upper surface opening area or the lower surface opening area of the ventilation hole 15 is set small, so it is difficult for incident light L to enter the vehicle interior. Thereby, in this embodiment, it is difficult for the incident light L to directly hit the occupants or the like, and the vehicle interior can be maintained comfortably.

[0034] [Second Embodiment] Next, a sunshade device 100 according to a second embodiment will be described with reference to Figures 7 and 8. Figure 7 is a partial plan view of the shade portion, and Figure 8 is a conceptual diagram of a cross section of the shade portion. In the second embodiment, the ventilation holes 15 are formed differently in the passenger area RP and the non-passenger area RN. In the second embodiment, the ventilation holes have a truncated cone shape, as in the first embodiment. However, the ventilation holes may have a shape other than a truncated cone.

[0035] As shown in Figures 7(A) and 8(A), ventilation holes 15 are formed in the passenger area RP in the same manner as in the first embodiment. On the other hand, as shown in Figures 7(B) and 8(B), similar ventilation holes 15 are formed in the non-passenger area RN in the vehicle front area RF and the vehicle rear area RR. That is, in the non-passenger area RN, even in the vehicle rear area RR, the upper surface opening dimension Dr1 is set larger than the lower surface opening dimension Dr2. Note that the upper surface opening dimension Dr1 is equal to the upper surface opening dimension Df1 (Dr1 = Df1), and the lower surface opening dimension Dr2 is equal to the lower surface opening dimension Df2 (Dr2 = Df2).

[0036] In this embodiment, compared to the first embodiment, the upper surface opening dimension D1 of the ventilation holes 15 is set larger than the lower surface opening dimension D2 even in the non-occupant area RN of the vehicle rear area RR (i.e., upper surface opening area > lower surface opening area). Therefore, in this embodiment, it is possible to take in more outside air A0 into the vehicle cabin from a wider area of ​​the shade part 10. Also, in this embodiment, since the inside air A1 is discharged from the occupant area RP of the vehicle rear area RR, a flow of the inside air A1 is formed in the vehicle width direction X in addition to the vehicle fore-and-aft direction Y within the vehicle cabin, making it easier to form a flow of the inside air A1 near the occupants.

[0037] [Third embodiment] Next, a sunshade device 100 according to a third embodiment will be described with reference to Figures 9 and 10. Figure 9 is an explanatory diagram of the shade portion, and Figure 10 is a graph showing the change in ventilation flow rate versus the ratio of opening size to thickness. In the third embodiment, the thickness T of the base material 12 and the opening size D of the ventilation holes 15 are formed differently in the vehicle rear region RR compared to the first embodiment. Note that in the third embodiment, the ventilation holes have a truncated cone shape, as in the first embodiment. However, the ventilation holes may have a shape other than a truncated cone.

[0038] 9(A), in this embodiment, as in the first embodiment, ventilation holes 15 are arranged at predetermined intervals (equal intervals in this embodiment) in the X and Y directions. In the vehicle front region RF, ventilation holes 15 having the same opening dimension D1f (diameter) are formed. On the other hand, in the vehicle rear region RR, ventilation holes 15 are formed whose opening dimension is smaller than that of the vehicle front region RF, and whose opening dimension becomes smaller toward the rear of the vehicle.

[0039] 9, the distance between the centroids of adjacent ventilation holes 15 is constant throughout the shade portion 10, but is not limited to this and may be set narrower toward the rear of the vehicle in the vehicle rear region RR. In this case, the number of ventilation holes 15 per unit area is greater in the vehicle rear region RR than in the vehicle front region RF. In this specification, the centroid of a ventilation hole corresponds to the virtual center of gravity of the opening shape of the ventilation hole in a plan view.

[0040] As shown in FIG. 9 , in the vehicle front region RF, the thickness T of the base material 12 is a constant thickness Tf, and the upper surface opening dimension D1 and the lower surface opening dimension D2 of the ventilation holes 15 are constant dimensions Df1 and Df2, respectively. On the other hand, in the vehicle rear region RR, the thickness T of the base material 12 gradually or stepwise decreases from Tf to Tr (Tf > Tr) so as to become thinner toward the rear of the vehicle. Also, in the vehicle rear region RR, unlike the first embodiment, the upper surface opening dimension Dr1 of the ventilation holes 15 gradually or stepwise decreases from Df2 to Dr1 (Df2 > Dr1), and the lower surface opening dimension Dr2 also gradually or stepwise decreases from Df1 to Dr2 (Df1 > Dr2) depending on the thickness T of the base material 12. In this embodiment, the opening dimension D of the ventilation holes 15 (in this embodiment, the average of the upper surface opening dimension D1 and the lower surface opening dimension D2) is related to the thickness T of the base material 12. That is, the opening dimension D is set to be approximately the same as the thickness T (D≈T).

[0041] Therefore, in this embodiment, the volume of the ventilation holes 15 is smaller in the vehicle rear region RR than in the vehicle front region RF. In addition, the total volume of the ventilation holes 15 per unit area is also smaller in the vehicle rear region RR than in the vehicle front region RF. In this embodiment, by setting the opening area of ​​the ventilation holes 15 to be smaller in the vehicle rear region RR, the incidence of incident light L into the vehicle interior in the vehicle rear region RR is further suppressed.

[0042] Figure 10 shows the results of a simulation of the ventilation volume through the shade while the vehicle is moving. In this computer experiment, it is assumed that the vehicle is moving at a predetermined speed (e.g., 50 km / h) and that a predetermined wind is blowing from front to rear on the shade. The thickness of the shade is set to a predetermined dimension (e.g., 3 mm). The ventilation hole has a rectangular parallelepiped shape (length of one side = opening dimension D). The horizontal axis of Figure 10 represents T / D, and the vertical axis represents ventilation flow rate (kg / s). The ventilation flow rate is the amount of air flowing into and out of the vehicle cabin.

[0043] Referring to FIG. 10, the ventilation flow rate is maximum when T / D=1 (i.e., the opening dimension Df and thickness Tf of the ventilation hole 15 are equal). Therefore, from this calculation result, it is preferable to set the opening dimension D of the shade portion 10 to be approximately the same as the thickness T of the base material 12 in order to improve the ventilation flow rate. Therefore, in the example of FIG. 9, the shade portion 10 is formed so that D≒T (for example, (Df1+Df2) / 2=Tf, (Dr1+Dr2) / 2=Tr).

[0044] In the above embodiment, the thickness of the base material 12 in the vehicle rear region RR is gradually thinner toward the rear of the vehicle, but this is not limiting and the thickness may be gradually thinner. For example, if the thickness of the base material 12 in the vehicle front region RF is 4 mm (constant), the thickness of the base material 12 in the vehicle rear region RR can be gradually thinner from 4 mm to 3 mm, 2 mm, and 1 mm toward the rear of the vehicle.

[0045] Next, the operation and effect of the vehicle sunshade device 100 according to this embodiment will be described. The vehicle sunshade device 100 of this embodiment comprises an openable / closable window glass 4 that can move between a closed position that closes the opening 3a of the window frame 3 of the roof 2 of the vehicle 1 and an open position that opens the opening 3a of the window frame 3, and a shade section 10 that is arranged inside the vehicle 1 so as to cover the opening 3a of the window frame 3, and the shade section 10 has a sheet-shaped base material 12 having a predetermined thickness T and a plurality of ventilation holes 15 that penetrate the base material 12, and the shade section 10 has, in a plan view, a vehicle front region RF and a vehicle rear region RR, and the opening area of ​​the ventilation holes on the upper surface of the base material 12 is formed smaller in the vehicle rear region RR than in the vehicle front region RF.

[0046] According to this embodiment, the opening area of ​​the ventilation holes 15 on the upper surface of the base material 12 is smaller in the vehicle rear region RR than in the vehicle front region RF. This allows for a flow of air that draws outside air A0 into the vehicle cabin preferentially from the vehicle front region RF rather than from the vehicle rear region RR, and causes inside air A1 to circulate from the front to the rear within the vehicle cabin and be discharged outside the vehicle from the vehicle rear region RR, thereby improving ventilation efficiency. Conventionally, incident light is blocked to some extent by frames or the like located above the heads of passengers such as the driver in the front of the vehicle cabin, making it difficult for front seat passengers to be exposed to incident light. However, in the rear of the vehicle cabin, incident light is not blocked by frames or the like, making it easier for rear seat passengers to be exposed to incident light. However, in this embodiment, the opening area of ​​the ventilation holes 15 on the upper surface of the base material 12 in the vehicle rear region RR is smaller, thereby preventing incident light L from entering the vehicle cabin and reducing the incidence of incident light on rear seat passengers. As a result, by using the vehicle sunshade device 100 of this embodiment, the occupants can suppress the operation of the air conditioning device, thereby reducing energy loss due to air conditioning work and extending the driving range of the vehicle 1.

[0047] In this embodiment, preferably, the vehicle front region RF is provided at least above the driver's seat and / or passenger seat of the vehicle 1, and the vehicle rear region RR is provided at least above the rear seats of the vehicle 1. According to this embodiment configured as described above, outside air A0 is taken in from above the vehicle front region RF toward the driver in the front, and inside air A1 moves toward the passengers in the rear, and then the inside air A1 is discharged from above the rear passengers to the outside of the vehicle through the vehicle rear region RR.

[0048] In addition, in the present embodiment, preferably, the ventilation holes 15 are formed in the vehicle rear region RR such that the opening area of ​​the upper surface of the base material 12 is smaller than the opening area of ​​the lower surface of the base material 12. According to the present embodiment configured in this manner, in the vehicle rear region RR, the small opening area on the upper surface of the ventilation holes 15 makes it easier to block incident light L, and the large opening area on the lower surface of the ventilation holes 15 makes it easier to take in the inside air A1 from the vehicle cabin for exhaust.

[0049] In addition, in this embodiment, preferably, the ventilation holes 15 are formed in the vehicle front region RF such that the opening area of ​​the upper surface of the base material 12 is larger than the opening area of ​​the lower surface of the base material 12. According to this embodiment configured in this manner, in the vehicle front region RF, the opening area on the upper surface of the ventilation holes 15 is large, making it easier to take in outside air A0 while driving, and the opening area on the lower surface of the ventilation holes 15 is small, making it possible to increase the flow rate of the outside air A0 taken in from outside and introduce it into the vehicle cabin.

[0050] Preferably, in this embodiment, the ventilation holes 15 have a polygonal truncated pyramid or a circular truncated cone shape. Preferably, the ventilation holes 15 are formed in approximately the same number per unit area in the vehicle front region RF and the vehicle rear region RR. This configuration of the present embodiment facilitates the formation of an air flow that draws outside air A0 into the vehicle cabin from the vehicle front region RF while the vehicle is traveling and expels inside air A1 to the outside of the vehicle from the vehicle rear region RR.

[0051] In addition, in this embodiment, the base material 12 is preferably formed so that the thickness of the base material 12 is thinner in the vehicle rear region RR than in the vehicle front region RF. According to this embodiment configured in this manner, the flow resistance of the ventilation holes 15 in the vehicle rear region RR is reduced, making it easier to discharge the inside air A1 from the vehicle rear region RR to the outside.

[0052] In this embodiment, preferably, the opening area of ​​the ventilation hole 15 is formed to be smaller as the thickness T of the base material 12 is thinner. According to this embodiment configured in this manner, it is possible to further suppress the incidence of incident light L into the vehicle interior while maintaining good ventilation efficiency at the ventilation hole 15.

[0053] In addition, in this embodiment, preferably, the vehicle 1 has at least a driver's seat and a passenger seat, and the shade portion 10 has, in a plan view, an occupant area RP including a driver's seat area RP1 extending in the longitudinal direction Y of the vehicle 1 above the driver's seat and a passenger seat area RP2 extending in the longitudinal direction Y of the vehicle 1 above the passenger seat, and a non-occupant area RN extending in the longitudinal direction Y of the vehicle 1 between the driver's seat area RP1 and the passenger seat area RP2, and the ventilation holes 15 are formed in the upper surface of the base material 12 so that the opening areas of the vehicle front area RF and the vehicle rear area RR of the non-occupant area RN are substantially the same. According to this embodiment configured in this manner, it is possible for the entire shade portion 10 to take in more outside air A0 into the vehicle cabin while traveling. In addition, according to this embodiment, since the inside air A1 is discharged from the occupant area RP in the rear area RR of the vehicle, a flow of the inside air A1 is formed in the vehicle width direction X in addition to the vehicle fore-and-aft direction Y within the vehicle cabin, making it easier to form a flow of the inside air A1 near the occupants. [Explanation of symbols]

[0054] 1 vehicle 3 Window Frame 3a opening 4. Window Glass 10 Shade section 12 Base material 15 ventilation holes 100 Vehicle sunshade device

Claims

1. A sunshade device for a vehicle, an openable window glass that is movable between a closed position that closes an opening in a window frame of a roof of a vehicle and an open position that opens the opening in the window frame; a shade portion that is disposed inside the vehicle so as to cover the opening of the window frame, The shade portion has a sheet-shaped base material having a predetermined thickness and a plurality of ventilation holes penetrating the base material, A sunshade device for a vehicle, wherein the shade portion has, in a plan view, a vehicle front region portion and a vehicle rear region portion, and the opening area of ​​the ventilation hole on the upper surface of the base material is formed smaller in the vehicle rear region portion than in the vehicle front region portion.

2. 2. The vehicle sunshade device according to claim 1, wherein the vehicle front area is provided above at least a driver's seat and / or a passenger seat of the vehicle, and the vehicle rear area is provided above at least a rear seat of the vehicle.

3. 2. The vehicle sunshade device according to claim 1, wherein the ventilation holes are formed in the vehicle rear region such that an opening area of ​​an upper surface of the base material is smaller than an opening area of ​​a lower surface of the base material.

4. 2. The vehicle sunshade device according to claim 1, wherein the ventilation holes are formed in the vehicle front region portion such that an opening area of ​​an upper surface of the base material is larger than an opening area of ​​a lower surface of the base material.

5. The sunshade device for a vehicle according to claim 3 or 4, wherein the ventilation hole has a shape of a polygonal truncated pyramid or a circular truncated cone.

6. 2. The vehicle sunshade device according to claim 1, wherein the number of ventilation holes formed per unit area is approximately the same in the vehicle front region and the vehicle rear region.

7. The vehicle sunshade device according to claim 1, wherein the base material is formed so that the thickness of the base material is thinner in the vehicle rear region than in the vehicle front region.

8. The vehicle sunshade device according to claim 7, wherein the opening area of ​​the ventilation hole is formed to be smaller as the thickness of the base material is thinner.

9. The vehicle has at least a driver's seat and a passenger seat, The shade portion has, in a plan view, an occupant area portion including a driver's seat area portion extending in the front-rear direction of the vehicle above the driver's seat and a passenger seat area portion extending in the front-rear direction of the vehicle above the passenger seat, and a non-occupant area portion extending in the front-rear direction of the vehicle between the driver's seat area portion and the passenger seat area portion, 2. The vehicle sunshade device according to claim 1, wherein the ventilation holes are formed in the upper surface of the base material with opening areas that are substantially the same in the vehicle front region and the vehicle rear region of the non-occupant region.

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