JP2008230305A - Light shielding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely rewind a screen around a winding member even when environmental temperature is decreased. <P>SOLUTION: When the environmental temperature is decreased, a cover member 30 is contracted in a radial direction. Moreover, when the screen 12 is developed from the winding member 26, expansion in the radial direction of a part in a longitudinal direction in a coil spring 28 is restricted by a cover section 30A out of a plurality of cover sections 30A, 30B, 30C provided in the cover member 30. Therefore, when the screen 12 is developed from the winding member 26 from this condition, the remaining part in the longitudinal direction of the coil spring 28 is equivalent to the effective length of the coil spring 28, and the effective length of the coil spring 28 is shortened compared to that before a decrease in the environmental temperature. Thus, the torsional force of the coil spring 28 is increased compared to that before the decrease in the environmental temperature (ordinary temperature), and the screen 12 can be rewound around the winding member 26 surely. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light shielding device, and more particularly to a light shielding device configured to wind a screen with a winding member biased by a coil spring.

Conventionally, as this kind of light shielding device, for example, the following is known (for example, see Patent Document 1). In the example described in Patent Document 1, a shaft for winding up the cover and a spring for biasing the shaft are provided. In addition, a silencer is provided between the shaft and the spring for preventing abnormal noise.
Japanese Patent Laying-Open No. 2003-205786 (FIG. 3) Japanese Utility Model Publication No. 6-61533 (FIG. 1)

  However, in the above configuration, when the silencer is contracted as the environmental temperature decreases, this may become a loss and the torsional force of the spring may decrease, and the cover may not be wound around the shaft. Accordingly, there is room for improvement in order to ensure that the cover can be wound around the shaft even when the environmental temperature is lowered.

  The present invention has been made in view of the above problems, and an object thereof is to provide a light-shielding device that can reliably wind a screen around a winding member even when the environmental temperature is lowered.

  In order to solve the above-described problem, the light-shielding device according to claim 1 is disposed inside a sheet-shaped screen, a cylindrical winding member for winding the screen, and the winding member, A coil spring that is expanded in the radial direction when the screen is deployed from the winding member and biases the winding member in the direction in which the screen is wound by the torsional force, and the coil spring is disposed inside the winding member. And a plurality of cover portions in the longitudinal direction which are configured in a cylindrical shape in which the coil spring is disposed therein and have different radial distances from the coil spring, and at least in the radial direction as the environmental temperature decreases. And a cover member configured to be shrunk to a height.

  In the light shielding device according to claim 1, a coil spring is disposed inside the cylindrical winding member, and the coil spring is radially expanded when the screen is deployed from the winding member. The winding member is biased in the direction in which the screen is wound by the twisting force. Therefore, when winding the unfolded screen, the screen can be easily wound by rotating the winding member by the twisting force of the coil spring.

  By the way, in the light-shielding device configured to wind the screen with the winding member biased by this type of coil spring, the screen can be reliably wound around the winding member even when the environmental temperature is lowered. It is necessary to do so.

  In this respect, in the light shielding device according to claim 1, a cover member for covering the coil spring is provided, and the cover member includes a plurality of cover portions having different radial distances from the coil spring in the longitudinal direction. It is configured to be contracted at least in the radial direction as the environmental temperature decreases.

  Therefore, when the environmental temperature decreases, the cover member contracts in the radial direction as the environmental temperature decreases. When the screen is unfolded from the winding member, at least one of the plurality of cover portions provided on the cover member is arranged in the longitudinal direction of the coil spring by the cover portion having the smallest radial distance from the coil spring. Expansion of the portion in the radial direction is restricted.

  For this reason, when the screen is deployed from the winding member from this state, the remaining portion in the longitudinal direction of the coil spring corresponds to the effective length of the coil spring, and the effective length of the coil spring is compared with that before the environmental temperature is lowered. Is shortened. As a result, the torsional force of the coil spring is increased compared to before the environmental temperature is lowered.

  Thus, according to the light shielding device of the first aspect, when the environmental temperature is lowered, the torsional force of the coil spring is increased as compared with before the environmental temperature is lowered. Even when it falls, the screen can be reliably wound around the winding member.

  The light-shielding device according to claim 2 is the light-shielding device according to claim 1, wherein at least the cover portion having the smallest radial distance from the coil spring among the plurality of cover portions is reduced in environmental temperature. When the screen is contracted in the radial direction, a part of the coil spring in the radial direction is restrained from expanding in the radial direction when the screen is deployed from the winding member. It is characterized by that.

  According to the light-shielding device according to claim 2, when the cover portion configured to have at least the smallest radial distance from the coil spring among the plurality of cover portions is contracted in the radial direction as the environmental temperature decreases. Restrains the radial extension of a part of the longitudinal direction of the coil spring when the screen is deployed from the winding member. Thereby, when environmental temperature falls, when a screen is expand | deployed from a winding member, the effective length of a coil spring can be shortened compared with before environmental temperature falls.

  The light-shielding device according to claim 3 is the light-shielding device according to claim 1 or 2, wherein the cover member is formed of a thermoplastic resin.

  According to the light shielding device of the third aspect, since the cover member is formed of the thermoplastic resin, the cover member is contracted in the radial direction when the environmental temperature is lowered, and a part of the coil spring in the longitudinal direction is contracted. Expansion in the radial direction can be constrained.

  The light-shielding device according to a fourth aspect is the light-shielding device according to any one of the first to third aspects, wherein the plurality of cover portions are configured separately.

  According to the light shielding device of the fourth aspect, the plurality of cover portions are configured separately. Accordingly, the plurality of cover portions can be easily and reliably formed by, for example, cylindrical members having different diameters. Thereby, the increase in the manufacturing cost of the whole cover member which has a some cover part can be prevented.

  The light-shielding device according to claim 5 is the light-shielding device according to any one of claims 1 to 3, wherein the plurality of cover portions are integrally formed.

  According to the light-shielding device of the fifth aspect, the plurality of cover portions are integrally formed. Therefore, an increase in the number of parts can be prevented.

  In order to solve the above-mentioned problem, the light shielding device according to claim 6 is disposed inside a sheet-like screen, a cylindrical winding member for winding up the screen, and the winding member. A coil spring that expands in the radial direction when the screen is deployed from the winding member and biases the winding member in the direction in which the screen is wound by the torsional force; and an interior of the winding member And a cylindrical shape in which a part of the coil spring in the longitudinal direction is disposed therein, and is configured to be contracted at least in the radial direction as the environmental temperature decreases. When the screen is contracted in the radial direction with the decrease in the length of the coil spring, when the screen is deployed from the winding member, a part of the longitudinal direction of the coil spring in the radial direction is expanded. Characterized in that and a restraining portion configured to restrain the.

  In the light-shielding device according to claim 6, a coil spring is disposed inside the cylindrical winding member, and the coil spring is radially expanded when the screen is deployed from the winding member. The winding member is biased in the direction in which the screen is wound by the twisting force. Therefore, when winding up the developed screen, the screen can be easily taken up by rotating the take-up member by the twisting force of the coil spring.

  Here, in the light shielding device according to the sixth aspect, a constraining portion is provided in which a part of the coil spring in the longitudinal direction is disposed. The constraining portion is configured to be contracted at least in the radial direction as the environmental temperature decreases, and when the screen is deployed from the winding member when contracted in the radial direction as the environmental temperature decreases. Furthermore, the radial expansion of a part of the longitudinal direction of the coil spring is restricted.

  For this reason, when the screen is deployed from the winding member from this state, the remaining portion in the longitudinal direction of the coil spring corresponds to the effective length of the coil spring, and the effective length of the coil spring is compared with that before the environmental temperature is lowered. Is shortened. As a result, the torsional force of the coil spring is increased compared to before the environmental temperature is lowered.

  Thus, according to the light-shielding device of the sixth aspect, when the environmental temperature is lowered, the torsional force of the coil spring is increased as compared with before the environmental temperature is lowered. Even when it falls, the screen can be reliably wound around the winding member.

  The light-shielding device according to claim 7 is the light-shielding device according to claim 6, further comprising a cylindrical cover member that is disposed inside the winding member and in which the coil spring is disposed. The restricting portion constitutes a part in the longitudinal direction of the cover member.

  According to the light shielding device of the seventh aspect, the cover member for covering the coil spring is provided, and the above-described restraining portion constitutes a part of the cover member in the longitudinal direction. Therefore, an increase in the number of parts can be prevented.

  First, the configuration of the light shielding device 10 according to an embodiment of the present invention will be described.

  FIG. 1 is a perspective view showing the overall configuration of a light shielding device 10 according to an embodiment of the present invention, FIG. 2 is a front view showing the overall configuration of the light shielding device 10, and FIG. The principal part expanded sectional view of each is shown. 1 shows a state when the screen 12 is in the middle of deployment, and FIGS. 2 and 3 show a state when the screen 12 is wound around and stored in the winding member 26. FIG. Has been.

  A light shielding device 10 according to an embodiment of the present invention is mounted on a vehicle in order to shield a rear glass of, for example, a passenger car, and as shown in FIGS. A winding mechanism 14, a link mechanism 16, a base member 18, a drive mechanism 20, and a controller 22 are provided as main components.

  The screen 12 is made of, for example, a cloth material having a light shielding property, and is formed in a sheet shape. One end of the screen 12 is fixed to a winding member 26 described later. A screen support member 24 is provided at the width direction edge portion 12 </ b> A on the development side of the screen 12. The screen support member 24 is provided along the longitudinal direction of the width direction edge portion 12 </ b> A of the screen 12, and the screen 12 is expanded in the width direction by the width direction edge portion 12 </ b> A being supported by the screen support member 24. Maintained.

  As illustrated in FIG. 3, the winding mechanism 14 includes a winding member 26, a coil spring 28, and a cover member 30. The winding member 26 is for winding the screen 12, and is formed in a longitudinal cylindrical shape. Holder caps 32 and 34 are integrally fitted to both ends of the winding member 26, and shafts 36 and 38 are rotatably held by the holder caps 32 and 34, respectively. The shafts 36 and 38 are integrally fixed to a stay 40 provided on the base member 18 (see FIG. 1). With this configuration, the winding member 26 is rotatable with respect to the base member 18 described later.

  The coil spring 28 is disposed inside the winding member 26 with one shaft 36 inserted therein. The coil spring 28 has one end 28 </ b> A fixed to the shaft 36 and the other end 28 </ b> B fixed to the holder cap 32. The coil spring 28 is radially expanded when the screen 12 is deployed from the winding member 26, and biases the winding member 26 in the direction in which the screen 12 is wound by the torsional force.

  The cover member 30 (silencer) serves to prevent interference between the coil spring 28 and the winding member 26, and is configured in a tube shape (cylindrical shape). The cover member 30 has a coil spring 28 disposed therein and is disposed inside the winding member 26. Further, the cover member 30 is provided with a plurality of cover portions 30A, 30B, 30C having different diameters in the longitudinal direction. The plurality of cover portions 30A, 30B, and 30C are configured separately.

  The cover member 30 is made of a material that contracts with a decrease in environmental temperature, such as polyvinyl chloride. And the cover part 30A with the smallest inner diameter among the plurality of cover parts 30A, 30B, 30C provided on the cover member 30 and the cover part 30B with the second smallest inner diameter are, for example, When the shrinkage rate and the inner diameter are set optimally, as will be described in detail later, when the screen 12 is deployed in the radial direction as the environmental temperature decreases, The coil spring 28 is configured to restrain a part of the longitudinal direction of the coil spring 28 from expanding in the radial direction.

  In the present embodiment, the constraining portion according to the present invention includes the cover portion 30A having the smallest inner diameter among the plurality of cover portions 30A, 30B, and 30C and the cover portion 30B having the second smallest inner diameter. Is configured.

  As shown in FIGS. 1 and 2, the link mechanism 16 includes a link rod 42, a lever 44, a lower link 46, and an upper link 48. Each link rod 42 has one end rotatably connected to each rotation end of a link lever 58 described later, and the other end rotatably connected to each rotation end of each lever 44.

  Each lever 44 is rotatably connected to both ends of the base member 18, and each lower link 46 is integrally fixed to the rotation shaft of each lever 44 and rotated together with each lever 44. It has become so. Each upper link 48 is connected to a rotating end of each lower link 46 through an intermediate joint 50, and the rotating end is connected to both ends of the above-mentioned screen support member 24 so as to be rotatable.

  The base member 18 is provided along the longitudinal direction of the winding member 26 described above. Assist springs 52 (balance springs) are provided on both ends of the base member 18, respectively. One end of each assist spring 52 is locked to the base member 18, and the other end is locked to the rotation end of each lever 44. Each assist spring 52 urges the lever 44 in the direction in which the screen 12 is deployed (in the direction of arrow R3 in FIG. 1).

  The drive mechanism 20 includes a drive motor 56, a link lever 58, and a support member 60, and is disposed at the center of the base member 18. The drive motor 56 is fixed to the base member 18 by a support member 60, and the link lever 58 is rotatably supported by the support member 60. The link lever 58 is connected to the output shaft 62 of the drive motor 56 and is rotated together with the output shaft 62 of the drive motor 56.

  For example, the controller 22 includes an electric circuit on which a CPU, a ROM, a RAM, and the like are mounted, and is configured to input a control signal output from an external control device and control the drive motor 56. ing.

  Next, the operation and effect of the light shielding device 10 according to one embodiment of the present invention will be described.

  In the light shielding device 10 according to an embodiment of the present invention, the drive motor 56 shown in FIG. 1 inputs a control signal (forward rotation signal) from the controller 22 and rotates forward, and the link lever 58 rotates in the R1 direction. Then, the lever 44 connected to the link lever 58 via the link rod 42 is rotated in the R3 direction. Further, when the lever 44 is rotated in the R3 direction, the lower link 46 fixed to the lever 44 is rotated in the R5 direction, and the upper link 48 connected to the lower link 46 via the intermediate joint 50 is formed. It is rotated in the R7 direction. Then, with the operation of the lower link 46 and the upper link 48, the screen 12 is pulled upward, whereby the screen 12 is deployed from the winding member 26.

  At this time, the coil spring 28 disposed inside the winding member 26 is expanded in the radial direction when the screen 12 is deployed from the winding member 26, and the winding member 26 is moved to the screen 12 by the twisting force. Is energized in the direction of winding. Accordingly, the slack of the screen 12 is prevented and the screen 12 is expanded. Then, when the lower link 46 and the upper link 48 are rotated so that the lower link 46 and the upper link 48 are linear along the vertical direction, the link mechanism 16 is in the extended posture. In addition, when the link mechanism 16 is in the extended posture, the screen 12 is in an unfolded state that covers the entire rear glass of the vehicle, for example.

  On the other hand, when the drive motor 56 is reversed by inputting a control signal (inverted signal) from the controller 22 and the link lever 58 is rotated in the R2 direction, the link lever 58 and the link rod 42 are connected. The lever 44 is rotated in the R4 direction. When the lever 44 is rotated in the R4 direction, the lower link 46 fixed to the lever 44 is rotated in the R6 direction, and the upper link 48 connected to the lower link 46 via the intermediate joint 50 is formed. It is rotated in the R8 direction.

  At this time, the winding member 26 is rotated in the direction of winding the screen 12 by the torsional force of the coil spring 28, so that the screen 12 is wound around the winding member 26. As shown in FIG. 2, when the lower link 46 and the upper link 48 are rotated and the lower link 46 and the upper link 48 overlap each other in the substantially horizontal direction, the link mechanism 16 is in the folded posture. Is done. Further, when the link mechanism 16 is in the folded posture, the screen 12 is brought into a storage state in which the screen 12 is completely wound around the winding member 26.

  By the way, in the light-shielding device 10 configured to wind up the screen 12 with the winding member 26 biased by this type of coil spring 28, the screen 12 is securely attached to the winding member 26 even when the environmental temperature is lowered. Need to be able to wind up.

  In this regard, in the light shielding device 10 according to the embodiment of the present invention, the cover member 30 for covering the coil spring 28 is provided, and the cover member 30 has cover portions 30A, 30B, and 30C having different inner diameters. Are provided in the longitudinal direction and are contracted at least in the radial direction as the environmental temperature decreases.

  Therefore, when the environmental temperature decreases, the cover member 30 is contracted in the radial direction as the environmental temperature decreases, for example, as shown in FIGS. 4 (A) to 4 (B). When the screen 12 is unfolded from the winding member 26, the longitudinal length of the coil spring 28 is increased by the cover portion 30 </ b> A having the smallest inner diameter among the plurality of cover portions 30 </ b> A, 30 </ b> B, 30 </ b> C provided on the cover member 30. Expansion of a part of the direction in the radial direction is restricted.

  For this reason, when the screen 12 is unfolded from the winding member 26 from this state, the remaining portion in the longitudinal direction of the coil spring 28 corresponds to the effective length L of the coil spring 28, compared to before the environmental temperature is lowered. The effective length L of the coil spring 28 is shortened. As a result, the torsional force (spring force) of the coil spring 28 is increased compared to before the ambient temperature is lowered (normal temperature) (see FIG. 5).

  Further, when the environmental temperature further decreases, the cover member 30 is further contracted in the radial direction as the environmental temperature decreases, for example, as shown in FIGS. 4B to 4C. When the screen 12 is deployed from the winding member 26, the cover portion 30A having the smallest inner diameter among the plurality of cover portions 30A, 30B, and 30C provided on the cover member 30 and the second inner diameter are arranged. The cover portion 30 </ b> B configured to be small in size constrains the radial extension of a part of the longitudinal direction of the coil spring 28.

  For this reason, when the screen 12 is unfolded from the winding member 26 from this state, the remaining portion in the longitudinal direction of the coil spring 28 corresponds to the effective length L of the coil spring 28, compared to before the environmental temperature is lowered. The effective length L of the coil spring 28 is further shortened. As a result, the torsional force of the coil spring 28 is further increased compared to before the environmental temperature is lowered.

  Thus, according to the light-shielding device 10 according to one embodiment of the present invention, when the environmental temperature decreases, the torsional force of the coil spring 28 is increased compared to before the environmental temperature decreases. Even when the environmental temperature decreases, the screen 12 can be reliably wound around the winding member 26.

  In particular, according to the light-shielding device 10 according to an embodiment of the present invention, even if the load of the link mechanism 16 increases as the environmental temperature decreases (that is, the movement of the link mechanism 16 becomes worse due to cold). The screen 12 can be reliably wound around the winding member 26.

  Moreover, according to the light-shielding device 10 according to an embodiment of the present invention, when the environmental temperature decreases, the torsional force of the coil spring 28 can be increased compared to before the environmental temperature decreases. It is not necessary to increase the torsional force of the coil spring 28 in advance assuming a low temperature. As a result, it is possible to prevent the torsional force of the coil spring 28 from acting more than necessary at a normal temperature, and it is possible to prevent the load of the drive motor 56 from increasing and the functionality of the entire apparatus from deteriorating.

  Moreover, according to the light-shielding device 10 according to one embodiment of the present invention, since only the cover member 30 formed of polyvinyl chloride is used, the screen 12 is wound on the winding member 26 without increasing the manufacturing cost. Can be reliably wound up.

  Moreover, according to the light-shielding device 10 which concerns on one Embodiment of this invention, several cover part 30A, 30B, 30C is comprised separately. Accordingly, the plurality of cover portions 30A, 30B, and 30C can be easily and reliably formed by, for example, cylindrical members having different diameters. Thereby, the increase in the manufacturing cost of the whole cover member 30 which has several cover part 30A, 30B, 30C can be prevented.

  Moreover, according to the light-shielding device 10 which concerns on one Embodiment of this invention, a part of cover member 30 for covering the coil spring 28 restrains the expansion to a part of radial direction of the coil spring 28 in the longitudinal direction. Therefore, it is not necessary to provide a special member separately from the cover member 30 for restricting the radial extension of a part of the coil spring 28 in the longitudinal direction. Therefore, an increase in the number of parts can be prevented.

  Next, a modified example of the light shielding device 10 according to an embodiment of the present invention will be described.

  In the above embodiment, the plurality of cover portions 30A, 30B, and 30C are configured separately, but as shown in FIG. 6, the plurality of cover portions 30A, 30B, and 30C may be configured integrally. . In this way, an increase in the number of parts can be prevented.

  In the above embodiment, the cover member 30 is provided with the three cover portions 30A, 30B, and 30C. However, the cover portions 30A, 30B, and 30C may be, for example, two or more than two. May be.

  Moreover, in the said embodiment, although several cover part 30A, 30B, 30C was arrange | positioned in order with a small internal diameter, you may arrange | position in another order.

  Moreover, in the said embodiment, cover part 30A, 30B is a function which suppresses interference with the coil spring 28 and the winding member 26, and a function which restrains the expansion to the radial direction of a part of longitudinal direction in the coil spring 28. However, the coil spring 28 may be configured to have only a function of restricting a part of the longitudinal direction of the coil spring 28 in the radial direction.

  Moreover, in the said embodiment, although the cover member 30 was formed with the polyvinyl chloride, the cover member 30 should just be a raw material shrink | contracted according to the fall of environmental temperature, Besides, for example, polyethylene, polystyrene It may be formed of a thermoplastic resin such as.

  Further, the cover member 30 may be configured to include, for example, reinforcing fibers extending in the longitudinal direction, and may be configured to contract only in the radial direction.

  In the above embodiment, the cover portions 30A, 30B, and 30C are configured to have different inner diameters so that the radial distances between the plurality of cover portions 30A, 30B, and 30C and the coil spring 28 are different. However, it may be as follows. That is, the plurality of cover portions 30A, 30B, and 30C have the same diameter, and the coil spring 28 is configured with different outer diameters in the longitudinal direction, whereby the diameters of the plurality of cover portions 30A, 30B, and 30C and the coil spring 28 are obtained. The direction distance may be different. Even in this case, when the environmental temperature decreases, the effective length of the coil spring 28 can be shortened.

  Further, in the above-described embodiment, the inner diameters of the cover portions 30A, 30B, and 30C are gradually reduced. However, for example, the inner diameter of each cover portion may be tapered to gradually decrease the inner diameter. .

It is a perspective view showing the whole light shielding device composition concerning one embodiment of the present invention. It is a front view which shows the whole structure of the light-shielding apparatus which concerns on one Embodiment of this invention. It is a principal part expanded sectional view of the light-shielding apparatus which concerns on one Embodiment of this invention. It is operation | movement explanatory drawing of the light-shielding apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows the change of the twist force of the coil spring at the time of low temperature and normal temperature in the light-shielding device which concerns on one Embodiment of this invention. It is a figure which shows the modification of the light-shielding apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Shading device, 12 ... Screen, 12A ... Edge in width direction, 14 ... Winding mechanism, 16 ... Link mechanism, 18 ... Base member, 20 ... Drive mechanism, 22 ... Controller, 24 ... Screen support member, 26 ... Winding Take-up member, 28 ... Coil spring, 30 ... Cover member, 30A, 30B ... Cover part (restraint part), 30C ... Cover part, 32, 34 ... Holder cap, 36, 38 ... Shaft, 40 ... Stay, 42 ... Link rod 44 ... Lever, 46 ... Lower link, 48 ... Upper link, 50 ... Intermediate joint, 52 ... Assist spring, 56 ... Drive motor, 58 ... Link lever, 60 ... Support member, 62 ... Output shaft

Claims (7)

A sheet-like screen,
A cylindrical winding member for winding the screen;
A coil that is arranged inside the winding member, and is expanded in the radial direction when the screen is unfolded from the winding member, and biases the winding member in the direction in which the screen is wound by the torsional force. Springs,
A plurality of cover portions disposed in the winding member and having a plurality of cover portions in the longitudinal direction, each having a radial distance from the coil spring; A cover member configured to shrink at least in the radial direction as the temperature decreases;
A light-shielding device comprising:   When the cover portion configured to have at least the smallest radial distance from the coil spring among the plurality of cover portions is contracted in the radial direction as the environmental temperature decreases, the screen is separated from the winding member. The light-shielding device according to claim 1, wherein, when deployed, the light-shielding device is configured to constrain a radial extension of a part of the longitudinal direction of the coil spring.   The light shielding device according to claim 1, wherein the cover member is made of a thermoplastic resin.   The light shielding device according to any one of claims 1 to 3, wherein the plurality of cover portions are configured separately.   The light shielding device according to any one of claims 1 to 3, wherein the plurality of cover portions are integrally formed. A sheet-like screen,
A cylindrical winding member for winding the screen;
A coil that is arranged inside the winding member, and is expanded in the radial direction when the screen is unfolded from the winding member, and biases the winding member in the direction in which the screen is wound by the torsional force. Springs,
It is arranged in the inside of the winding member and is formed in a cylindrical shape in which a part of the coil spring in the longitudinal direction is arranged, and is contracted at least in the radial direction as the environmental temperature decreases. When the screen is expanded in the radial direction as the environmental temperature decreases, when the screen is expanded from the winding member, a part of the coil spring in the radial direction is expanded in the radial direction. A restraint configured to restrain;
A light-shielding device comprising: A cylindrical cover member disposed inside the winding member and having the coil spring disposed therein;
The light shielding device according to claim 6, wherein the constraining portion constitutes a part of a longitudinal direction of the cover member.

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