received by the International Bureau on 20 October 2019 (20.10.2019)

[Claim 1] The indirect light skydome with natural ventilation for building roofs consists of

- The curved dome that has both transparent part (1) and opaque part (2) for use in dividing the part that requires natural light and the part that need to protect against direct sunlight or direct rays according to the shading line (3) which are calculated from the vertical angle of the sun's orbit direction. The opaque part is on the south side due to the south of Thailand is the direction that has high heat of sun rays so it is not suitable to direct exposure.

- The horizontal circular base to support the dome (6) is the part under the dome and lays flat with a part of fan shape opening in the south (4), with the angle at the center of the circle equals to 132 degrees, sym metrical left-right on both sides (13), which is the most effective horizontal angle to protect direct sunlight for Thailand. Sunlight that passes through the transparent part of the dome (1) to the fan shape opening of the horizontal circular base (4) will be indirect light, which could prevent direct radiation throughout the year. The user does not have to adjust or rotate the device according to the time change and this base also serves as a support and attached to the dome parts (100) and the ring screen for dust and insects proof (8).

- The part for light transmission to the inside (9) may be shaped like a tube to transmit light. The mouth of the tube is the part that connects to the horizontal circular base (6) to be used as a connection. The diameter of the tube mouth is slightly shorter than the diameter of the horizontal circular base (6), because the horizontal circular base (6) is placed on the mouth of the part for light transmission tube to the inside (9).

- The ring screen for dust and insects proof (8) installed on the support plates (8) that extended from the horizontal circular base (6) near the air vent (102) designing to have a shape that is related to the air vent (102) and may be selected from the shape of the ring or partial ring.

Special characteristics are as follows:

The skylight dome (100) is designed in a half-spherical form with curved brim around the base of the dome (101). It has a wider diameter to be used as air vent at a lower horizontal around the dome (102). The surrounding air vent (102) allows the internal hot air inside the building to vent out in all directions and the external wind coming from all di- 21 rections can blow through the dome and bring hot air to the opposite direction. Thus, it allows better ventilation than the vents with only 1 or 2 directions. Having a vent at the bottom (102) can prevent rain water from splashing and leaking into the interior better than opening top vents or vertical openings.

In the receiving and shading parts of this skylight dome (100), it is divided into transparent part (1) to receive indirect sunlight and the opaque part (2) to prevent direct sunlight. In the production process, the method of bringing transparent materials that can form a skylight dome (100) with the curved brim that attached and connects the dome into the same piece and using coating techniques by spraying, painting, or coating opaque materials over the opaque part (2) of the dome to avoid rainwater leakage problems at the joints in the use of 2 types of materials (transparent - opaque) to connect together. In which the opaque part of the coating is placed in the south position (2) and the transparent part therefore is positioned on the north side (1) by dividing these two parts according to the degrees obtained from calculating the angle of the sun's angle in the vertical direction of the Summer Solstice to prevent direct sunlight in this area and by using the angle of the sun that is acting on the perpendicular line at the center (10) and the angle of the sun's rays acting on the horizontal plane of the base plane (11) to draw the shading line (3) as the end of the opaque part (2). Together with the base parts used to support the dome, which is designed to be a base with a circular shape in the horizontal direction (6) to facilitate rotation, adjust the direction of exposure to the right position during the installation process. This horizontal circular base (6) has a horizontal surface at the top (5) that is used for direct radiation protection that may passes down to the bottom and has a fan shape opening for receiving indirect light (4), which is a triangle angle in the position that cor responds to the center of the radius of the dome. The fan shape angle (13) that is angled between 132-180 degrees and placed to the opposite side of the transparent part (1) by placing it to the south. In a sym metrical manner, left-right. The most suitable fan shape angle (13) is the angle of 132 degrees, which is the horizontal angle obtained by cal culating the position of the sun's rays of Thailand. When it is combined with the vertical angle of the opaque part (2) of the skylight dome (100), it will be able to prevent direct radiation to be most effective throughout the daytimes from sunrise until sunset. The fan shape angle 22

(13) at an angle more than 132 degrees (132-180 degrees) will reduce the effectiveness for direct light protection at certain times.

[Claim 2] [Amended] The indirect light skydome with natural ventilation for building roofs according to claim number 1, wherein the half- spherical form skylight dome (100) has a curved brim around the base of the dome (101) for air vent at a lower horizontal around the dome (102). The length of the brim extended horizontally from the edge of the diameter of the dome should not more than half of the diameter of the dome and the height of the curved brim should not more than half of the diameter of the dome or the height of the dome (12).

[Claim 3] [Amended] The indirect light skydome with natural ventilation for building roofs according to claim number 1, wherein the horizontal circular base (6) is designed to have a round edge like a lid for placing the cover on the light transmission part to the inside (9) which may look like a light transmission tube in order to prevent rainwater entering inside and convenient to adjust the direction of the aperture opening to the correct position in the installation process by adjusting the fan shape opening area (4) to the south and connecting to the light transmission to the inside (9).

[Claim 4] [Amended] The indirect light skydome with natural ventilation for building roofs according to claim number 3, wherein the horizontal circular base (6) also serves as a support and attaches to the skylight dome (100) by the edge of the horizontal circular base will have 2-6 support plates (7) extended from the horizontal circular base (6). The length of these supports (7) must cover the mouth of the surrounding dome to be the point of supporting the curved brim of the dome and adhering together by tightening the nuts and bolts for proper strength, stability and for economic reasons, there should be 3-4 support plates.

[Claim 5] [Amended] The indirect light skydome with natural ventilation for building roofs according to claim number 4, wherein the support of the horizontal circular base (7) used for supporting and installing with the skylight dome (100) at the curved brim of the dome and supports the ring screens for dust and insects proof (8) that are installed around the air vent area under the dome mouth (102) at a lower position than the flat surface at the top (5) in order to be able to install the dome (100), which may be designed to have a dome mounting mechanism (103) at the outer edge of the section in the support plates (7). It may be designed to have 2 edges for the inner and outer domes, which may be 23 designed for the inner edge to be embedded in the nuts for tightening and the outer edge has holes for inserting the bolts at the level that cor responds to the holes of nuts at the inner edge by matching the aperture hole in the dome (100) when placing on this support (7) and bonding together with the bolts. This may be designed to the support plate (7) with an anchor point (104) for fixing the ring screen for dust and insects proof (8), such as making a lodge button to be used to lock the frame of the grating that is punched on each side.

[Claim 6] [Amended] The indirect light skydome with natural ventilation for building roofs according to claim number 1, wherein the ring screen(s) for dust and insects proof (8) may be one ring shape covering all air vent slots (102) or separating the parts of the ring-shaped into pieces or partial ring according to the number of the support parts of the horizontal circular base (7) used to support and attach to ring screen(s) (8).

[Claim 7] [Amended] The indirect light skydome with natural ventilation for building roofs according to the claim number 3, wherein the position of the horizontal circular base (6) with fan shape openings in the area of the flat surface at the top (5), in some cases this opaque part can be changed to be a translucent materials to increase the illuminance levels, but should have a light transmittance of not more than 50 percent because this area is still the area that has the opportunity to receive the sunlight directly. The use of translucent material in this position is therefore necessary to consider the amount of heat that comes with sunlight.

[Claim 8] [Amended] The indirect light skydome with natural ventilation for building roofs according to claim number 1, wherein the part of light transmission to the inside (9) may be shaped like a tube for light transmission. The diameter of the tube is slightly smaller than the diameter of the horizontal circular base (6) so that the horizontal circular base that is the cover is able to place on the mouth and the mouth of the top tube may be designed to have a round edge that sets the edge of the mouth to the inside of the ring, slightly like a ring, and to be used as an area to attach to a horizontal circular base (6) that will be placed on the mouth after turning the horizontal circular base to the right direction By adhering to each other, such as firing a pilot screw from the hole drilled at the edge of the circular base in the horizontal 2-4 points. The length of light transmission part (9) or tube and the 24 shape on the bottom of the tube, depending on the suitability for in stallation on the roof of each type of buildings, such as the roof of the building that is tilted and using different tiles for roofing can adjust the shape of the bottom of the light transmission part (9) or tube to connect in shape that can be stacked on the roof tiles of the same type (14) or the tube to install with the skylight dome (100) that consists of a horizontal circular base (6) in a plane parallel to the ground, etc.