TW201812059A - Film formation apparatus - Google Patents

Abstract

A film formation apparatus includes: a chamber that accommodates a target therein; a stage arranged so as to face a surface of the target at a predetermined distance, on which a film formation object is to be mounted; and a platen ring that has an opposed face facing the target and a groove formed on the opposed face, and surrounds a circumferential edge of the stage. A circumferential edge of the film formation object to be mounted on the stage protrudes from the circumferential edge of the stage so as to be located outside the circumferential edge of the stage, the groove is located at a position corresponding to the circumferential edge of the film formation object, the groove is circumferentially provided on the platen ring so that a first distance from the target to the film formation object is greater than a second distance from the target to the groove, and the groove has a back-surface-film-adhesion-prevention curved surface that prevents film formation particles sputtered from the target from being deposited on a back surface of the film formation object.

Description

Film-forming device, platen ring

The present invention relates to a film forming apparatus and an annular plate, and in particular, to a technique preferably used to prevent the film from being attached to the back surface of a substrate to be formed during film formation such as sputtering.

Sputtering equipment is widely used in various fields of the industry as a film-forming equipment for making thin films on the surface of objects. Especially in the manufacture of various electronic devices represented by LSI (Large Scale Integration, large scale integrated circuits), sputtering devices are mostly used in the production of various conductive films or insulating films. Japanese Patent No. 5654939 describes an example of performing sputtering of Al, and Japanese Patent Laid-Open No. 2013-120858 describes an example of performing sputtering of Cu. In recent years, the demand for redistribution Al has increased. The rewiring Al is a thick film with a film thickness of more than 1000 nm and is obtained by a film formation method using a vacuum device. The film thickness of the rewiring Al is set to be significantly thicker than the film thickness (<100 nm) of fine wiring that has been conventionally performed so far. As the film thickness of the wiring formed on the substrate such as the substrate increases, the Al film attached to the back surface of the substrate also becomes thicker. Therefore, it is necessary to remove the film attached to the back surface to cause a problem of increased steps, and there is a demand to reduce the amount of the Al film attached to the back surface of the substrate. Also, not only Al, but also other Cu, Ti, Ta, W and other film formations, there is a requirement to reduce the amount of film adhesion to the back surface of the substrate.

The present invention has been completed in view of the above circumstances, and it is intended to achieve the following objects. 1. In the film formation such as sputtering, prevent the film from adhering to the back of the object to be formed. 2. When forming a thick film on the film-forming object, prevent the film from adhering to the back of the film-forming object. 3. In the case of different film-forming particles, the film is also prevented from attaching to the back of the film-forming object. In order to solve the above-mentioned problems, the film-forming apparatus according to the first aspect of the present invention includes: a chamber that houses a target; a platform that is disposed opposite to a surface of the target at a specific interval and mounts a film-forming object; An annular plate includes an opposing surface opposed to the target and a groove formed in the opposing surface, and surrounds the periphery of the platform. The peripheral edge of the film-formed object placed on the platform extends from the peripheral edge of the platform so as to lie outside the peripheral edge of the platform, and the groove is arranged at a position corresponding to the peripheral edge of the film-formed object The groove is arranged around the annular plate so that the second distance from the target to the groove is greater than the first distance from the target to the film-forming object, and the groove contains film-forming particles that prevent release from the target The anti-back surface film-curved surface deposited on the back surface of the film-formed object. In the film forming apparatus according to the first aspect of the present invention, the curved surface of the anti-backside film can also be included in a curved surface having a radius of curvature in a cross section along the normal direction of the platform. In the film forming apparatus according to the first aspect of the present invention, the groove may further include an inner wall away from the outer side of the platform and an inner wall close to the inner surface of the platform, and the curved surface of the anti-backside film is provided in the groove in the groove Lateral inner wall. In the film forming apparatus according to the first aspect of the present invention, the groove may further include an inner wall away from the outer side of the platform and an inner wall close to the inner surface of the platform, and the curved surface of the anti-backside film is provided in the groove in the groove Inner wall. In the film forming apparatus according to the first aspect of the present invention, the curved surface of the anti-backside film may be formed in an arc shape in a cross section along the normal direction of the platform. In the film-forming apparatus of the first aspect of the present invention, the curved surface of the anti-backside film may be formed in an elliptical shape in a cross-section along the normal direction of the platform. In the film-forming apparatus according to the first aspect of the present invention, in the groove, the curved surface of the back-side film-preventing surface may be away from the inner wall of the outer side of the platform, and from the back side of the film-forming object toward the platform From the position of the boundary where the platform protrudes in the direction of the outside, toward the lower side of the level that becomes the normal direction of the side surface of the platform, draw a line extending with the maximum angle θ from the above level by sputtering, In this case, the position of the upper end of the outer inner wall is higher than the position of the point where the straight line intersects the outer inner wall. In the film-forming apparatus according to the first aspect of the present invention, in the groove, the curved surface of the back-side film-preventing surface may be away from the inner wall of the outer side of the platform and perpendicular to the normal direction of the side surface of the platform Cross section, drawing a straight line connecting the center of curvature of the curved surface of the anti-backside film and the junction of the backside of the film-forming object protruding from the platform in a direction toward the outside of the platform. In this case, The angle formed by the straight line on the lower side with respect to the horizontal is set to be greater than the maximum sputtering release angle θ. In the film forming apparatus of the first aspect of the present invention, the shape of the platform may be circular or rectangular when viewed from the target. The ring plate of the second aspect of the present invention is used in the film forming apparatus of the first aspect. Since the film-forming apparatus of the first aspect of the present invention includes a curved surface that prevents film from being attached to the back surface, the film-forming particles re-evaporated or re-sputtered from the annular plate are not easy to fly to and reach the back surface of the film-formed object, so they are not Will accumulate on the back of the film-forming object. That is, the film-forming particles from the target do not fly to the back surface of the film-forming object, and thus do not attach the film to the back surface of the film-forming object. In addition, since the curved surface of the anti-backside coating film has a curved surface inclined with respect to the incident direction of the particles, the film-forming particles re-sputtered on the curved surface of the anti-backside film-coated surface of the ring plate will not fly toward the back surface of the film-formed object. That is, particles that are re-sputtered or re-evaporated from inside the groove of the annular plate will not travel toward the back of the film-forming object. For example, it is released toward the other parts of the interior of the tank, or toward the inner wall of the chamber when viewed from the tank. Therefore, the film-forming particles (sputtering particles) no longer accumulate on the back surface of the film-forming object. This eliminates the need to remove the film attached to the back. Also, since the anti-backside film surface is included in the curved surface with a radius of curvature along the normal direction of the platform, it is within the vertical cross-section along the normal direction of the side surface of the platform, for example, although the particles The direction of the part, or the direction toward the inner wall of the chamber when viewed from the groove, does not travel toward the back of the film-forming object. Therefore, the film-forming particles (sputtering particles) no longer accumulate on the back surface of the film-forming object. This eliminates the need to remove the film attached to the back. In addition, the back surface anti-film coating curved surface is provided in the groove away from the inner wall of the outer side of the platform, whereby the film-forming particles incident on the outer wall of the outer wall of the groove can be used for film formation when the back surface anti-film coating curved surface is re-sputtered The particles do not fly to the back of the film-formed object. In addition, the anti-backside film-attached curved surface is provided in the tank on the inner inner wall close to the platform, whereby the film-forming particles incident on the inner-side inner wall of the tank can be formed when the anti-backside film-attached curved surface is re-sputtered Membrane particles do not fly to the back of the film-formed object. In addition, the curved surface of the anti-backside film is formed in a circular arc shape along the vertical section along the normal direction of the platform. In this way, in a vertical cross-section along the normal direction of the platform, the film-forming particles incident on the groove at an angle other than the angle of the film-forming particles incident on the groove through the point of the arc-shaped curvature center are opposed Sputter again at a linearly symmetrical exit angle extending from the incident position to the center of curvature of the anti-backside film surface. The film-forming particles that enter through the point that becomes the center of curvature exit from the groove in the incident direction. Therefore, when the film-forming particles are re-sputtered on the arc-shaped anti-back surface of the film, the film-forming particles can be prevented from flying toward the back of the film-forming object. In addition, the curved surface of the anti-backside film is formed into an elliptical shape in a vertical section along the normal direction of the platform. By this, in a vertical section along the normal direction of the platform, the film-forming particles that enter the groove at an angle other than the angle that enters the groove through the point that becomes the center of curvature of the ellipse are relative to Sputter from a linearly symmetrical exit angle extending from the incident position to the center of curvature of the anti-backside film surface curvature. The film-forming particles that enter through the point that becomes the center of curvature exit from the groove in the incident direction. Therefore, when the film-forming particles are re-sputtered on the elliptical anti-backside film-attached curved surface, the film-forming particles can be prevented from flying toward the back of the film-forming object. Also, in the groove, the anti-backside film-attached curved surface is away from the outer wall of the platform, and from the backside of the film-forming object in the direction toward the outer side of the platform, the junction protrudes from the platform toward the side of the platform The horizontal of the normal direction is further down, and a straight line extending the maximum angle θ with respect to the horizontal is drawn. In this case, the position of the upper end of the outer inner wall is located at a point where the straight line intersects the outer inner wall. The position is higher. Thereby, the film-forming particles re-sputtered on the back surface film-preventing curved surface (back surface film-preventing wall portion) of the annular plate can be prevented from flying toward the back surface of the film-formed object. In addition, in the groove, the curved surface of the back surface prevention film is a vertical section away from the outer wall of the platform, and is perpendicular to the normal direction of the side surface of the platform, and the center of curvature of the curved surface of the back surface prevention film and the film to be formed are drawn. The straight line connecting the back surface of the object at the junction extending from the platform in the direction toward the outer side of the platform. In this case, the angle formed by the straight line with respect to the horizontal at the lower side is set to be greater than the maximum angle of sputtering release θ . Thereby, the film-forming particles re-sputtered on the back surface film-preventing curved surface (back surface film-preventing wall portion) of the annular plate can be prevented from flying toward the back surface of the film-formed object. In addition, since the shape of the stage is circular or rectangular when viewed from the target, a circular or rectangular wafer or the like can be used as a film-forming object. The ring plate of the second aspect of the present invention is used in the film forming apparatus described in any one of the above. Therefore, it is used as a sputtering device, vapor deposition device, plasma CVD (Chemical Vapor Deposition) device as a film-forming device that scatters directional particles (film-forming particles), and uses catalyst chemical vapor In the film forming apparatus such as the Cat CVD (Catalyst Chemical Vapor Deposition) apparatus of the deposition method, the ring plate of the second aspect can also be applied. Thereby, the film-forming particles re-sputtered on the back surface film-preventing curved surface (back surface film-preventing wall portion) of the annular plate can be prevented from flying toward the back surface of the film-formed object. [Effects of the invention] According to the aspect of the present invention, the following effects can be produced: in the film formation such as sputtering, it is possible to prevent the film from adhering to the back surface of the film-forming object (substrate, etc.), so that the film-forming object In the case of a thick film, it is possible to prevent the film from adhering to the back surface of the film-forming object (substrate, etc.), and in the case of using different film-forming particles, the back film is also prevented in the same manner.

Hereinafter, the film forming apparatus and the ring plate of the first embodiment of the present invention will be described based on the drawings. FIG. 1 is a schematic cross-sectional view showing a film forming apparatus of this embodiment. In FIG. 1, reference numeral 10 is a film forming apparatus. As an example, the film forming apparatus 10 of this embodiment is a sputtering apparatus, and as shown in FIG. 1, includes a chamber (vacuum tank) 11. In the internal space of the chamber 11 and above the vertical direction, a target 12 is arranged. In addition, a platform 13 is formed in the inner space of the chamber 11 and below, for example, in a state insulated from the chamber 11. The upper side of the platform 13 is a flat surface. The platform 13 supports a film-formed object, a round substrate such as a silicon wafer, or a rectangular substrate (film-formed object) 18 such as an FPD (Flat Panel Display). The planar shape of the platform 13 (the shape of the platform 13 viewed from the target 12) is circular or rectangular. Furthermore, inside the platform 13, for example, electrodes having an adsorption function are arranged. When the gas inside the chamber 11 is exhausted to be in a vacuum state, when the substrate 18 is placed on the stage 13 and a voltage is applied to the adsorption electrode, the stage 13 has the substrate (film-forming object) 18 electrostatically attracted to the stage The structure of the 13 surface is sufficient. In addition, as described below, the substrate 18 is placed on the platform 13 such that the edge of the substrate 18 protrudes from the end of the platform 13. That is, when the substrate 18 having a larger size than the upper surface edge of the platform 13 is disposed on the platform 13, the back surface 18a (lower surface) of the substrate 18 is not on the periphery of the substrate 18 13 The substrate 18 is placed on the platform 13 in such a way that the upper surface meets. A sputtering power source 21 is connected to the target 12. A turntable is provided in an area on the atmospheric side relative to the target 12. A permanent magnet is fixed to the turntable, and a magnetic field is applied to the area on the vacuum side with respect to the target. The chamber 11 is grounded, and the potential of the chamber 11 becomes the ground potential (GND). Here, the gas inside the chamber 11 is discharged to a vacuum state, and after the substrate 18 is electrostatically attracted to the stage 13, a sputtering gas (for example, a mixed gas (argon + nitrogen)) is introduced into the chamber 11 to start The sputtering power supply 21 applies a negative voltage to the target 12, thereby generating plasma near the surface of the target 12. When the free ions generated in the plasma are incident on the target 12, the material constituting the target 12 becomes sputtered particles S and flew out of the surface of the target 12 into the chamber 11. The film forming apparatus 10 is provided with a ground shield 15 so as to surround the target 12. In addition, an upper anti-adhesion plate (upper shield) 16 and a lower anti-adhesion plate (lower shield) 17 are arranged so as to surround the space between the target 12 and the platform 13. Such a ground shield 15, the upper anti-adhesion plate 16, and the lower anti-adhesion plate 17 constitute an anode and are grounded in the same manner as the chamber 11. The potential of the ground shield 15, the upper anti-adhesion plate 16, and the lower anti-adhesion plate 17 becomes the ground potential (GND). As a result, a thin film including the material constituting the target 12 and the sputtering gas material is formed on the substrate or the anti-adhesion plate. On the other hand, the platform 13 is configured such that high-frequency power is applied by the bias power supply 22. The potential of the substrate 18 becomes a negative potential by self-bias. Therefore, the electrons in the plasma are drawn to the anode, and the positively charged sputtered particles or free Ar cations flying out of the target 12 are drawn to the substrate 18. Therefore, the positively charged sputtered particles or free Ar cations strike the surface of the substrate 18, which produces the effect of etching the material deposited on the substrate. In such a film-forming apparatus 10, the sputtered particles (film-forming particles) S released from the target 12 diffuse in the chamber 11 during film formation. In order to prevent such sputtered particles from adhering and accumulating on the inner wall of the chamber 11, an upper anti-adhesion plate 16 and a lower anti-adhesion plate 17 are arranged. Among them, the upper anti-adhesion plate 16 is formed, for example, between the platform 13 and the target 12 and along the inner circumferential surface (side wall) 11a of the chamber 11 in the substantially vertical direction of the inner diameter (perpendicular to the vertical direction The diameter of the upper) is increased in the shape of a cylinder. That is, the inner diameter of the upper anti-adhesion plate 16 increases along the direction (upward direction) from the lower anti-adhesion plate 17 toward the ground shield 15 along the inner circumferential surface of the chamber 11, and the lower end area of the upper anti-adhesion plate 16 may be bent . On the other hand, the lower anti-adhesion plate 17 surrounds the peripheral region (edge portion) of the platform 13 and is formed in a ring shape that expands from the platform 13 toward the inner peripheral surface (side wall) 11a of the chamber 11. In addition, an annular plate 19 (bottom anti-adhesion plate) is formed on the bottom of the lower anti-adhesion plate 17 so as to fit with the bottom surface side of the lower anti-adhesion plate 17. FIG. 2 is an enlarged cross-sectional view of the ring plate in this embodiment. FIG. 2 shows a cross section of the annular plate 19 along the normal direction of the platform 13. Specifically, FIG. 2 shows that the annular plate 19 is formed in a ring shape so as to surround the periphery of the platform 13, and a cross section of the annular plate 19 perpendicular to the surrounding direction. The cross section of the annular plate 19 shown in FIG. 2 is a cross section in the radial direction when the substrate 18 is circular, and a cross section in the direction perpendicular to the four sides when the substrate 18 is rectangular. In other words, FIG. 2 shows a vertical cross section that becomes the normal direction of the side surface of the platform 13. The "normal direction of the side surface" is the radial direction of the substrate 18 when the substrate 18 is circular, and the direction perpendicular to the four sides of the substrate when the substrate 18 is rectangular. The ring plate 19 includes an upper surface 19 a (opposite surface) facing the target 12 (see FIG. 1), and a groove 20. The groove 20 is provided at a position adjacent to the upper surface 19a and close to the platform 13, and is provided (circumferentially provided) at a position close to the outer periphery of the annular plate 19. As shown in FIG. 2, the groove 20 is formed so as to surround the position outside the platform 13 when viewed from the target 12. In addition, the groove 20 is formed at a position that partially overlaps the substrate 18 placed on the stage 13 so as to protrude from the periphery of the stage 13. Furthermore, the position of the groove 20 corresponds to the position outside the substrate 18. When viewed from the target 12, the depth of the groove 20 at the position in the groove 20 corresponding to the outer position of the platform 13 and the position in the groove 20 corresponding to the peripheral position of the substrate 18 are different. In other words, the distance (second distance) from the target 12 to the inner surface of the groove 20 is greater than the distance (first distance) from the target 12 to the substrate (film-formed object) 18. The groove 20 having such a depth and provided in the annular plate 19 is disposed near the outer periphery of the platform 13. More specifically, inside the groove 20, an outer inner wall 20a away from the platform 13 and an inner inner wall 20b close to the platform 13 are formed. In other words, the outer inner wall 20a is disposed farther from the platform 13 than the inner inner wall 20b. The inner inner wall 20b is disposed closer to the platform 13 than the outer inner wall 20a. The outer inner wall 20a functions as a back-surface film-preventing curved surface that prevents the sputtered particles (film-forming particles) released from the target 12 from accumulating on the back surface 18a of the substrate 18. In the groove 20, as shown in FIG. 2, the inner inner wall 20b has an upper end Ub. The upper end Ub of the inner inner wall 20b substantially coincides with the inner position of the substrate 18 that extends from the periphery of the platform 13 and is placed on the outside, that is, the outer end of the upper surface of the platform 13. The upper end Ub of the inner inner wall 20b is erected in a direction from the platform 13 toward the target 12. In other words, the upper end Ub of the inner inner wall 20b is provided upright around the outer periphery of the platform 13 so as to face the normal direction of the platform 13 along the boundary line between the platform 13 and the back surface 18a of the substrate 18. Furthermore, as shown in FIG. 2, an inclined surface (tapered surface) is formed on the surface including the upper end Ub of the inner inner wall 20 b. In the cross-sectional view shown in FIG. 2, the inclined surface including the upper end Ub of the inner inner wall 20 b has a linear surface. That is, the inclined surface is formed to extend toward the upper end Ub of the inner inner wall 20b so that the width of the groove 20 gradually increases in the direction from the platform 13 toward the target 12. In other words, the thickness of the outer member (a part of the annular plate 19) facing the outer side of the platform 13 gradually becomes thinner in the direction from the platform 13 toward the target 12. In the groove 20, as shown in FIG. 2, the lower end side of the inner inner wall 20b functions as an anti-backside film-curved surface that prevents the sputtered particles (film-forming particles) released from the target 12 from accumulating on the backside 18a of the substrate 18 . The outer inner wall 20a and the inner inner wall 20b, which are curved surfaces for preventing backside film attachment, are connected to each other near the center of the groove 20 to form a bottom 20c. The upper end Ua of the outer inner wall 20a is arranged upright in the direction from the platform 13 toward the target 12 on the upper side of the arc shape on the outer side of the outer contour (front end T) of the substrate 18. In other words, the upper end Ua of the outer inner wall 20a is positioned outside the boundary line between the platform 13 and the back surface 18a of the substrate 18, and is erected in the normal direction of the platform 13. In the present embodiment, the outer inner wall 20a, the bottom 20c, and the inner inner wall 20b as the backside film-preventing wall portion (backside film-preventing curved surface) are all formed in an arc shape as shown in FIG. 2. The outer inner wall 20a is formed in an arc shape having a radius of curvature Ra. The inner inner wall 20b is formed in an arc shape having a radius of curvature Rb. The bottom portion 20c is formed in an arc shape with a radius of curvature Rc. The radius of curvature Ra, the radius of curvature Rb, and the radius of curvature Rc are set to be the same, and the outer inner wall 20a, the inner inner wall 20b, and the bottom 20c are shaped to have the same center of curvature 20o. Therefore, the outer inner wall 20a, the inner inner wall 20b, and the bottom 20c are formed in the same arc shape smoothly connected. The dimensions and shapes of the outer inner wall 20a, the bottom 20c, and the inner inner wall 20b as the curved surface of the back surface are set as follows: the height D of the inner inner wall 20b from the back surface 18a of the substrate 18 to the position of the bottom 20c, and the substrate 18 faces The length a of the outer side of the platform 13 protrudes toward the outer side of the platform 13, and the back surface 18a of the base plate 18 extends from the boundary K of the platform (the outer peripheral portion of the platform 13) to a surface that serves as an anti-backside film surface The distance (bottom width dimension) L of the upper end Ua of the outer inner wall 20a, and the release angle θ of the film-forming particles are sputtered. In this case, set the way to satisfy the relationship of the following formula: a ≦ L ≦ D / tanθ D- ( La) tanθ ≦ Ra D <5a Rb> a Ra + Rb> L Rc <D Ra = Rb = Rc. As a result, the size of the film forming apparatus 10 in the height direction can be prevented from becoming too large, and space saving can be achieved. FIG. 5 is an enlarged cross-sectional view showing the ring plate in this embodiment. As shown in FIG. 5, a straight line dP1 extending from the back surface 18a of the substrate 18 toward the outer side of the platform 13 at the front end T and extending horizontally at an angle equal to the sputtering release angle θ and the outer inner wall 20a The arcs intersect (at point P1). Here, the upper surface 19a, which is the upper end Ua of the outer inner wall 20a, may be located higher than the point P1 at which the arc of the straight line dP1 and the outer inner wall 20a reach. Also, a straight line dP2 extending from the back surface 18a of the substrate 18 from the boundary K extending from the platform 13 and extending at an angle equal to the sputtering release angle θ with respect to the horizontal intersects the arc of the outer inner wall 20a (to reach Point P2). Here, the upper surface 19a that becomes the upper end Ua of the outer inner wall 20a may be located above the point of arrival P2 of the arc of the straight line dP2 and the outer inner wall 20a. In addition, when the cross-sectional shape of the groove 20 is set to a substantially semicircle, the radius of curvature Ra is equal to the depth dimension of the groove 20, that is, the height dimension from the bottom 20c to the upper surface 19a of the groove 20. Furthermore, the setting method of these is demonstrated. As shown in FIG. 3, the sputtering release angle θ of the film-forming particles differs according to the material of the target 12. The general formula of the angular distribution function A (θ1) of the sputtering output is expressed by the following formula: A (θ1) = αsinθ1 (1 + βsin ² θ1) Here, α is a standardized constant, and β is based on the sputtering target substance, sputtering Constants that vary with gas. When β changes, the sputtering release angle θ changes to the maximum sputtering yield. The horizontal axis shown in FIG. 3 is horizontal with respect to the sputtering target, and the vertical axis shown in FIG. 3 is vertical with respect to the sputtering target. The length of the line connecting the point drawn in Figure 3 and the origin is A (θ1). θ1 is defined as the angle formed by the horizontal axis and the line segment of A (θ1). The sputtering release angle θ is defined as the angle at which the sputtering output becomes maximum. In addition, the description about FIG. 3 is described in Yamamura et al., Radiat. Eff. Defects Solids, 118 (1991) P27-33. The sputtering release angle θ depends on the material of the target 12, and the release angle distribution is various, and θ becomes a continuous and wide range of values. As examples of the sputtered particles and the sputter release angle θ with respect to them, Al (aluminum) and Ti (titanium) are shown below. As shown in FIG. 4, the sputter release angle θ has a certain degree of distribution with respect to vertically incident ions. However, in this embodiment, the angle at which the sputter output is maximized is defined as the sputter release angle θ. Here, the horizontal axis shown in FIG. 4 is a horizontal direction with respect to the sputtering target, and the vertical axis shown in FIG. 4 is a vertical direction with respect to the sputtering target. The length of the line connecting the point drawn in Figure 4 with the origin represents the sputtering output. As shown in FIG. 4, the sputtering release angle θ can be set to about 60 ° for aluminum and about 40 ° for titanium, respectively. As a specific example in this embodiment, when the height D of the inner inner wall 20b is set to 20 mm and the length a of the substrate 18 is set to 5 mm, when the sputtering particles are set to aluminum, the sputtering The release angle θ = 60 °, so the bottom width dimension L and the curvature radius Ra that becomes the height of the back surface film-preventing curved surface 20a can be set according to the above formula: 5 [mm] ≦ L ≦ 11.5 [mm] 5 [mm]-( L-5 [mm]) × 1.73 [mm] ≦ Ra Similarly, as a specific example in this embodiment, the height D of the inner inner wall 20b is set to 20 mm, and the extension length a of the substrate 18 is set to 5. In the case of mm, when the sputtering particles are made of titanium, the sputtering release angle θ = 40 °. Therefore, the radius of curvature Ra at the bottom width dimension L and the height of the curved surface 20a of the back surface prevention film can be set according to the above formula: 5 [mm] ≦ L ≦ 23.8 [mm] 5 [mm]-(L-5 [mm]) × 0.83 [mm] ≦ Ra By setting in the above manner, the dotted lines d1 and d2 shown in FIG. 2 In the inclined region of the clip, the sputtering particles flying toward the back surface 18a of the substrate 18 are reduced. In addition, the broken lines d1 and d2 are straight lines passing through the center of curvature 20o. In FIG. 2, sputtered particles flying vertically downward from the target 12 located above the platform 13 are incident on the groove 20. Then, the sputtered particles perpendicularly incident on the outer inner wall 20a with the dotted line d1 travel at an incident point B1 in an angular direction symmetrical to the incident angle with respect to the line passing through the center of curvature 20o. Therefore, in the groove 20, the sputtered particles flying out from the point on the right side of the point B1 passing through the broken line d1 shown in FIG. 2 travel toward the inner inner wall 20b, so the sputtered particles do not reach the back of the substrate 18 18a. Similarly, the sputtered particles perpendicularly incident on the inner inner wall 20b with the broken line d2 travel at an incident point B2 in an angular direction symmetrical to the incident angle with respect to the line passing through the center of curvature 20o. Therefore, in the groove 20, the sputtered particles flying out from the point on the left side of the point B2 passing through the broken line d2 shown in FIG. 2 travel toward the outer inner wall 20a, so the sputtered particles do not reach the back of the substrate 18 18a. Next, the point B3 on the outer inner wall 20a and the point B4 on the outer inner wall 20a shown in FIG. 2 will be described. The point B3 is a point where the dotted line d3 extending from the inner position of the base plate 18 that protrudes from the periphery of the platform 13 and placed through the center of curvature 20o reaches the outer inner wall 20a. The point B4 is a point where the dotted line d4 extending from the outer position of the base plate 18 that protrudes from the periphery of the platform 13 and placed on the outer side through the center of curvature 20o reaches the outer inner wall 20a. On the outer inner wall 20a, the area between the point B3 and the point B4 is indicated by the symbol γ. Sputtered particles incident on this region γ may travel toward the back surface 18a of the substrate 18, but since there are very few sputtered particles incident on this region γ, they hardly reach the back surface 18a of the substrate 18. Even if the sputtered particles are incident at an angle θa greater than the sputter release angle θ of the film-forming particles, they can be prevented from flying toward the back surface 18a of the substrate 18. In addition, even if the sputtered particles flew in the direction of the angle θ at the upper surface 19a on the upper side of the outer inner wall 20a which is the curved surface of the back surface film, it does not reach the back surface 18a of the substrate 18. As a result, re-sputtering of the back surface 18a of the substrate 18 can be prevented. In the present embodiment, the annular plate 19 is provided with a groove 20 including an outer inner wall 20 a as a curved surface for preventing backside film attachment corresponding to the substrate 18 protruding from around the platform 13. Therefore, it can be set that the traveling route of the sputtered particles does not face the back surface 18a of the substrate 18, so that the back surface 18a of the substrate 18 can be prevented from being re-sputtered. Furthermore, there is no need to provide a step of removing the film attached to the back surface 18a. Furthermore, even if the sputtered particles enter the groove 20 at an angle greater than the sputter release angle θ of the film-forming particles, they can be prevented from flying toward the back surface 18 a of the substrate 18. In addition, with respect to the width dimension L of the specific groove 20, the height D may be set to a relatively deep groove 20 within a range from Ltan θ to about 5 times the extension length a. In addition, the length a of the substrate 18 protruding toward the outside of the platform 13 is set to the length from the position where the exposed area of the back surface 18 a of the substrate 18 approaches the center of the substrate to the front end T of the back surface 18 a of the substrate 18. Therefore, the position of the boundary K between the substrate 18 and the platform 13 that defines the length a is not limited to the outer edge of the platform 13 or the upper end Ub of the inner inner wall 20b. In addition, by using the ring plate 19 of the embodiment of the present invention, it is possible to prevent the film from being attached to the back surface 18a during vapor deposition during film formation by sputtering. In this case, as an example of sputtering film formation, a DC (Direct Current) magnetron sputtering device, an RF (Radio Frequency) magnetron sputtering device, or, as an example of evaporation deposition, It is composed of electron beam vapor deposition device, resistance heating vapor deposition device, batch vapor deposition device, etc. Furthermore, the ring plate 19 according to the embodiment of the present invention can be used for manufacturing a photomask and the like. For example, as shown in FIG. 6, a case where an annular plate including a groove 120 having a rectangular cross section is used will be described. In this case, the sputtered particles incident on the groove 120 at an angle greater than the maximum release angle shown by the broken line d5, and then the sputtered component is attached to the back surface 18a of the substrate 18. Here, the groove 120 includes an outer inner wall 120a and an inner inner wall 120b parallel to the vertical direction, and a bottom 120c extending in the horizontal direction. In addition, as shown in FIG. 6, in the case of using an annular plate including a groove 120 having a rectangular cross section, it is impossible to prevent the re-sputtering component from attaching to the back surface of the substrate 18 in the inclined region sandwiched by the broken lines d6 and d7 18a. On the other hand, in this embodiment, since the outer inner wall 20a and the inner inner wall 20b are formed as the curved surface of the back surface prevention film in the groove 20, even if the sputtered particles as described above enter the groove 20 It can also prevent flying toward the back surface 18a of the substrate 18, thereby greatly reducing the occurrence of re-sputtering. In addition, since incident particles other than those incident through the center of curvature 20o become obliquely incident, re-sputtering toward the back surface 18a of the substrate 18 can be further reduced. Hereinafter, the film forming apparatus and the ring plate of the second embodiment of the present invention will be described based on the drawings. 7 is an enlarged cross-sectional view showing an annular plate in the film forming apparatus of this embodiment. This embodiment differs from the first embodiment described above in respect of the inner inner wall 20Ab and the bottom 20Ac. The other structure of the film forming apparatus of this embodiment is the same as that of the first embodiment described above. The components corresponding to the above-mentioned first embodiment are denoted by the same symbols and their description is omitted. As shown in FIG. 7, in the groove 20A of the film forming apparatus 10 of this embodiment, the bottom portion 20Ac and the inner inner wall 20Ab are formed in a planar shape (straight line shape). The upper end Ub of the inner inner wall 20Ab disposed at a position close to the platform 13 is substantially identical to the inner position of the substrate 18 extending from the periphery of the platform 13, that is, the outer end of the upper surface of the platform 13 is substantially the same 13 is set upright toward the target 12. In other words, the inner inner wall 20Ab is provided upright around the outer periphery of the platform 13 so as to face the normal direction of the platform 13 along the boundary line between the platform 13 and the back surface 18a of the substrate 18. Furthermore, as shown in FIG. 7, an inclined surface (tapered surface) is formed on the surface including the upper end Ub of the inner inner wall 20Ab. In the cross-sectional view shown in FIG. 7, the inclined surface including the upper end Ub of the inner inner wall 20Ab has a linear surface. That is, the inclined surface is formed to extend toward the upper end Ub of the inner inner wall 20Ab so that the width dimension of the groove 20A gradually increases in the direction from the platform 13 toward the target 12. In other words, the thickness of the outer member (a part of the annular plate 19) facing the outer side of the platform 13 gradually becomes thinner in the direction from the platform 13 toward the target 12. In the groove 20A, as shown in FIG. 7, the lower end of the inner inner wall 20Ab is connected to the bottom 20Ac parallel to the main surface of the platform 13, and the outer side of the bottom 20Ac is connected to the lower end of the arc-shaped outer inner wall 20a. The inner inner wall 20Ab is provided upright in the direction from the platform 13 toward the target 12 so as to be located more inside than the outer contour (front end T) of the substrate 18. In other words, the inner inner wall 20Ab is located at the inner side along the boundary line between the platform 13 and the back surface 18a of the substrate 18, and is erected in the normal direction of the platform 13. The connection position of the bottom portion 20Ac and the outer side inner wall 20a is set so as to be located outside the outer contour (front end T) of the substrate 18. A smooth curved surface is formed at the connection portion between the bottom portion 20Ac and the outer inner wall 20a. In this embodiment, the size and shape of the outer inner wall 20a, the bottom 20Ac, and the inner inner wall 20Ab are set to satisfy the following relationship: D- (La) tanθ ≦ Ra ≦ L a ≦ L ≦ D / tanθ 5a ≦ D. In the film forming apparatus 10 and the ring plate 19 of the present embodiment, by setting the size and shape of the outer inner wall 20a, the bottom 20Ac, and the inner inner wall 20Ab as described above, the dotted line shown in FIG. 7 can also be used. In the area corresponding to the inclined area sandwiched between d3 and d4, the sputtered particles flying toward the back surface 18a of the substrate 18 are reduced. Furthermore, in the film forming apparatus 10 and the ring plate 19 of this embodiment, the effect of prolonging the film removal maintenance cycle of the ring plate 19 can be produced. Hereinafter, based on the drawings, a film forming apparatus and a ring plate according to a third embodiment of the present invention will be described. 8 is an enlarged cross-sectional view showing an annular plate in the film forming apparatus of this embodiment. This embodiment differs from the first or second embodiment described above in respect of the outer inner wall 20Bb and the bottom 20Bc. The other structure of the film forming apparatus of this embodiment is the same as that of the above-mentioned first or second embodiment. The components corresponding to the above-mentioned first or second embodiment are denoted by the same symbols and their description is omitted. As shown in FIG. 8, in the groove 20B of the film forming apparatus 10 of the present embodiment, the bottom portion 20Bc and the outer inner wall 20Ba are formed in a planar shape (straight line shape). The outer inner wall 20Ba disposed at a position away from the platform 13 is located on the outer side of the outer contour (front end T) of the substrate 18 and is erected in a direction from the platform 13 toward the target 12. In other words, the outer inner wall 20Ba is located at a position outside the boundary line between the platform 13 and the back surface 18a of the substrate 18, and is erected in the normal direction of the platform 13. As shown in FIG. 8, in the groove 20B, the lower end of the outer inner wall 20Ba is connected to the outer side of the bottom 20Bc parallel to the main surface of the platform 13, and the inner side of the bottom 20Bc is connected to the lower end of the arc-shaped inner inner wall 20b . The inner inner wall 20b is provided upright in a direction from the platform 13 toward the target 12 such that the upper end Ub of the inner inner wall 20b is located more inside than the outer contour (front end T) of the substrate 18. The connection position of the inner inner wall 20b and the bottom 20Bc is set so as to be located outside the outer contour (front end T) of the substrate 18. A smooth curved surface is formed at the connection portion between the bottom portion 20Bc and the inner inner wall 20b. In this embodiment, the size and shape of the outer inner wall 20Ba, the bottom 20Bc, and the inner inner wall 20b are set to satisfy the following relationship: D- (La) tanθ ≦ Rb ≦ L a ≦ L ≦ D / tanθ 5a ≦ D. In the film forming apparatus 10 and the ring plate 19 of this embodiment, by setting the size and shape of the outer inner wall 20Ba, the bottom 20Bc, and the inner inner wall 20b as described above, it is possible to prevent the film from being attached to the back surface 18a of the substrate 18 . Specifically, the re-sputtered components of the sputtered particles that enter the groove 20B at an angle greater than the maximum release angle shown by the broken line d5 shown in FIG. 8 fly away in a direction different from the back surface 18 a of the substrate 18. Therefore, it is possible to reduce the sputtering particles flying away toward the back surface 18a of the substrate 18. Furthermore, in the film forming apparatus 10 and the ring plate 19 of this embodiment, the effect of prolonging the film removal maintenance cycle of the ring plate 19 can be produced. Hereinafter, the film forming apparatus and the ring plate of the fourth embodiment of the present invention will be described based on the drawings. 9 is an enlarged cross-sectional view showing an annular plate in the film forming apparatus of this embodiment. The difference between this embodiment and the above-described first embodiment lies in the groove 20C. The other structure of the film forming apparatus of this embodiment is the same as that of the first embodiment described above. The components corresponding to any of the above-mentioned first to third embodiments are denoted by the same symbols and their description is omitted. As shown in FIG. 9, in the groove 20C of the film forming apparatus 10 of the present embodiment, the outer inner wall 20Ca, the bottom 20Cc, and the inner inner wall 20Cb as the anti-backside film-attached curved surface are all formed in an elliptical shape (semi-elliptical shape). The center point 20Co of the elliptical shape of the outer inner wall 20Ca, the bottom 20Cc, and the inner inner wall 20Cb is set so as to become the center position of the groove 20C in the width direction of the groove 20C. As shown in FIG. 9, the groove 20C is formed so as to be bilaterally symmetric with respect to a line parallel to the vertical direction and passing through the center point 20Co. That is, the eccentricities of the outer inner wall 20Ca and the inner inner wall 20Cb are set to be equal. Therefore, the outer inner wall 20Ca, the inner inner wall 20Cb, and the bottom 20Cc are formed into the same ellipse (semi-elliptical shape) smoothly connected. Furthermore, in FIG. 9, the long axis of the ellipse is described as the width direction of the groove 20C and the left-right direction in the figure, but the long axis of the ellipse may be parallel to the vertical direction, that is, the long axis of the ellipse may be parallel to the up and down direction Groove 20C. In this embodiment, the sizes and shapes of the outer inner wall 20Ca, the bottom 20Cc, and the inner inner wall 20Cb as the curved surface of the back surface are set to satisfy the following relationship: a ≦ L ≦ D / tanθ 5a ≦ D. In the film forming apparatus 10 and the ring plate 19 of this embodiment, by setting the size and shape of the outer inner wall 20Ca, the bottom 20Cc, and the inner inner wall 20Cb as described above, it is possible to prevent the film from being attached to the back surface 18a of the substrate 18 . Specifically, the resputtered components of the sputtered particles incident on the groove 20C at an angle greater than the maximum release angle fly away in a direction different from the back surface 18a of the substrate 18. Therefore, it is possible to reduce the sputtering particles flying away toward the back surface 18a of the substrate 18. Furthermore, in the film forming apparatus 10 and the ring plate 19 of this embodiment, the effect of prolonging the film removal maintenance cycle of the ring plate 19 can be produced. Hereinafter, the film forming apparatus and the ring plate of the fifth embodiment of the present invention will be described based on the drawings. 10 is an enlarged cross-sectional view showing an annular plate in the film forming apparatus of this embodiment. This embodiment is different from any of the above-mentioned first to fourth embodiments in terms of the groove 20D. The other structure of the film forming apparatus of this embodiment is the same as any of the above-mentioned first to fourth embodiments. The components corresponding to any of the above-mentioned first to fourth embodiments are denoted by the same symbols and their description is omitted. As shown in FIG. 10, in the groove 20D in the film forming apparatus 10 of the present embodiment, the outer inner wall 20Da, the bottom 20Dc, and the inner inner wall 20Db are formed in a circular arc shape as a curved surface for preventing backside film attachment. The outer inner wall 20Da is formed in an arc shape with a radius of curvature Ra. The inner inner wall 20Db is formed in an arc shape with a radius of curvature Rb. The bottom portion 20Dc is formed as a circular arc as a connecting portion between the outer inner wall 20Da and the inner inner wall 20Db. The radius of curvature Ra and the radius of curvature Rb are set such that the radius of curvature Ra of the outer inner wall 20Da is greater than the radius of curvature Rb of the inner inner wall 20Db. In addition, the upper portion of the inner inner wall 20Db is more upright than the arc shape so as to have a linear shape having a wall portion extending in the vertical direction. Furthermore, the connection position of the outer inner wall 20Da and the inner inner wall 20Db is set to be substantially equal to the outer contour (front end T) of the substrate 18 in the width direction of the groove 20D. In addition, the connection portion of the bottom portion 20Dc is smoothly formed. The center of curvature 20Do (first center of curvature) of the outer inner wall 20Da and the center of curvature 20Dob (second center of curvature) of the inner inner wall 20Db are located at the same position in the width direction of the groove 20D. The center of curvature 20Do and the center of curvature 20Dob are located at substantially the same position as the outer contour (front end T) of the substrate 18 in the width direction of the groove 20D. That is, as shown in FIG. 10, the groove 20D is formed so as to be asymmetrical with respect to a line parallel to the vertical direction and passing through the center point 20Do. In this embodiment, the size and shape of the outer inner wall 20Da, the bottom 20Dc, and the inner inner wall 20Db as the anti-backside film-curved surface are set so as to satisfy the following relationship: Ra> Rb Rb = a. In the film forming apparatus 10 and the ring plate 19 of this embodiment, by setting the size and shape of the outer inner wall 20Da, the bottom 20Dc, and the inner inner wall 20Db as described above, it is possible to prevent the film from being attached to the back surface 18a of the substrate 18 . Specifically, the re-sputtered components of the sputtered particles incident on the groove 20D at an angle greater than the maximum release angle fly away in a direction different from the back surface 18a of the substrate 18. Therefore, it is possible to reduce the sputtering particles flying away toward the back surface 18a of the substrate 18. Furthermore, in the film forming apparatus 10 and the ring plate 19 of this embodiment, the effect of prolonging the film removal maintenance cycle of the ring plate 19 can be produced. Hereinafter, the ring plate of the film forming apparatus according to the sixth embodiment of the present invention will be described based on the drawings. FIG. 11 is an enlarged cross-sectional view showing an annular plate in the film forming apparatus of this embodiment. This embodiment differs from any of the first to fifth embodiments described above in respect of the groove 20E. The other structure of the film forming apparatus of this embodiment is the same as any of the above-mentioned first to fifth embodiments. The components corresponding to any of the above-mentioned first to fifth embodiments are denoted by the same symbols and their description is omitted. As shown in FIG. 11, in the groove 20E of the film forming apparatus 10 of the present embodiment, the outer inner wall 20Ea, the bottom 20Ec, and the inner inner wall 20Eb are formed in a circular arc shape as a curved surface for preventing backside film attachment. The outer inner wall 20Ea is formed in an arc shape having a radius of curvature Ra. The inner inner wall 20Eb is formed in an arc shape having a radius of curvature Rb. The bottom portion 20Ec is formed as a circular arc as a connecting portion between the outer inner wall 20Ea and the inner inner wall 20Eb. The radius of curvature Ra and the radius of curvature Rb are set such that the radius of curvature Ra of the outer inner wall 20Ea is smaller than the radius of curvature Rb of the inner inner wall 20Eb. In addition, the upper portion of the outer inner wall 20Ea that is higher than the arc shape is erected so as to have a linear shape having a wall portion extending in the vertical direction. In addition, the connection position of the outer inner wall 20Ea and the inner inner wall 20Eb is set so as to be located outside the outer contour (front end T) of the substrate 18 in the width direction of the groove 20E. In addition, the connection portion of the bottom portion 20Ec is formed smoothly. The center of curvature 20Eoa (first center of curvature) of the outer inner wall 20Ea and the center of curvature 20Eo (second center of curvature) of the inner inner wall 20Eb are all located at the same position in the width direction of the groove 20E. The center of curvature 20Eoa and the center of curvature 20Eo are located outside the outer contour (front end T) of the substrate 18 in the width direction of the groove 20E. That is, as shown in FIG. 11, the groove 20E is formed so as to be asymmetrical with respect to a line parallel to the vertical direction and passing through the center point 20Do. In this embodiment, the sizes and shapes of the outer inner wall 20Ea, the bottom E20c, and the inner inner wall 20Eb as the back surface film-preventing curved surface are set so as to satisfy the following relationship: Ra <Rb Rb> a. In the groove 20E in the present embodiment, the outer inner wall 20Ea serving as a curved surface for preventing backside film is arranged at least at a position away from the platform 13. In FIG. 11, a straight line d8 is shown. The straight line d8 connects the center of curvature 20Eoa of the outer inner wall 20Ea and the position of the junction K where the back surface 18 a of the base plate 18 protrudes from the platform 13 on the outer side of the platform 13. The angle formed by the straight line d8 and the horizontal is set to be greater than the maximum angle θ of sputtering release. In the film forming apparatus 10 and the ring plate 19 of this embodiment, by setting the size and shape of the outer inner wall 20Ea, the bottom E20c, and the inner inner wall 20Eb as described above, it is possible to prevent the film from being attached to the back surface 18a of the substrate 18 . Specifically, the resputtered component of the sputtered particles incident on the groove 20E at an angle greater than the maximum release angle flies away in a direction different from the back surface 18a of the substrate 18. Therefore, it is possible to reduce the sputtering particles flying away toward the back surface 18a of the substrate 18. Furthermore, in the film forming apparatus 10 and the ring plate 19 of this embodiment, the effect of prolonging the film removal maintenance cycle of the ring plate 19 can be produced. Although the preferred embodiments of the present invention have been described above, it should be understood that these are examples of the present invention and should not be considered as limiting the present invention. Additions, omissions, substitutions, and other changes can be made without departing from the scope of the present invention. Therefore, it should be understood that the present invention is not limited by the above description, but is limited by the scope of patent application.

10‧‧‧film forming device

11‧‧‧ chamber

11a‧‧‧Inner peripheral surface (side wall)

12‧‧‧ target

13‧‧‧Platform

15‧‧‧Ground shield

16‧‧‧Upper anti-adhesion plate

17‧‧‧Lower anti-adhesion plate

18‧‧‧substrate (film-formed object)

18a‧‧‧Back

19‧‧‧Ring plate

19a‧‧‧Upper surface (surface)

20‧‧‧slot

20A‧‧‧slot

20Ab‧‧‧Inner inner wall (anti-curved back surface)

20Ac‧‧‧Bottom

20a‧‧‧Outer inner wall (anti-back surface with film surface)

20B‧‧‧slot

20Ba‧‧‧Outside inner wall (anti-back surface with film surface)

20b‧‧‧Inner inner wall (anti-curved surface on the back)

20Bc‧‧‧Bottom

20C‧‧‧slot

20Ca‧‧‧Outer inner wall (anti-curved surface on the back)

20Cb‧‧‧Inner inner wall (anti-back surface with film surface)

20Cc‧‧‧Bottom

20Co‧‧‧Center

20c‧‧‧Bottom

20D‧‧‧slot

20Da‧‧‧Outer inner wall (anti-curved surface on the back)

20Db‧‧‧Inner inner wall (anti-back surface with film surface)

20Dc‧‧‧Bottom

20Do‧‧‧Curve Center (1st Curvature Center)

20Dob‧‧‧Curve Center (2nd Curvature Center)

20E‧‧‧slot

20Ea‧‧‧Outer inner wall (anti-curved surface on the back)

20Eb‧‧‧Inner inner wall (anti-back surface with film surface)

20Ec‧‧‧Bottom

20Eoa‧‧‧Curve Center (1st Curvature Center)

20Eo‧‧‧Curve Center (Second Curvature Center)

20o‧‧‧Curve Center

21‧‧‧Sputtering power supply

22‧‧‧bias power supply

120‧‧‧slot

120a‧‧‧Outer inner wall

120b‧‧‧Inner inner wall

120c‧‧‧Bottom

a‧‧‧Extended length

B1‧‧‧incidence point

B2‧‧‧incidence point

B3‧‧‧point

B4‧‧‧point

D‧‧‧Altitude

d1‧‧‧ dotted line

d2‧‧‧ dotted line

d3‧‧‧ dotted line

d4‧‧‧ dotted line

d5‧‧‧ dotted line

d6‧‧‧ dotted line

d7‧‧‧ dotted line

dP1‧‧‧Line

dP2‧‧‧Line

K‧‧‧ Junction

L‧‧‧Distance (Bottom width dimension)

P1‧‧‧ arrival point

P2‧‧‧ arrival point

Ra‧‧‧ radius of curvature

Rb‧‧‧ radius of curvature

Rc‧‧‧ radius of curvature

S‧‧‧Sputtered particles

T‧‧‧front

Ua‧‧‧Upper

Ub‧‧‧Upper

γ‧‧‧Region

θ‧‧‧Sputtering release angle

θa‧‧‧Angle

FIG. 1 is a schematic cross-sectional view showing a film forming apparatus according to a first embodiment of the present invention. 2 is an enlarged cross-sectional view showing an annular plate in the film forming apparatus according to the first embodiment of the present invention. Fig. 3 is a graph showing the release angle distribution of sputtering. Fig. 4 is a graph showing the angular distribution of sputtering release with respect to normally incident ions. 5 is an enlarged cross-sectional view showing the groove of the ring plate in the film forming apparatus according to the first embodiment of the present invention. 6 is an enlarged cross-sectional view showing an example of an annular plate in a film forming apparatus. 7 is an enlarged cross-sectional view showing an annular plate in a film forming apparatus according to a second embodiment of the present invention. 8 is an enlarged cross-sectional view showing an annular plate in a film forming apparatus according to a third embodiment of the present invention. 9 is an enlarged cross-sectional view showing an annular plate in a film forming apparatus according to a fourth embodiment of the present invention. 10 is an enlarged cross-sectional view showing an annular plate in a film forming apparatus according to a fifth embodiment of the present invention. 11 is an enlarged cross-sectional view showing an annular plate in a film forming apparatus according to a sixth embodiment of the present invention.

Claims (10)

A film-forming apparatus, comprising: a chamber which houses a target; a platform which is arranged opposite to a surface of the target at a specific interval and which is to place a film-forming object; and a ring-shaped plate, which includes a target opposed to the target The opposite surface and the groove formed in the opposite surface and surrounding the periphery of the platform; and the periphery of the film-formed object placed on the platform is located outside the periphery of the platform from the above The peripheral edge of the platform protrudes, and the groove is arranged at a position corresponding to the peripheral edge of the film-forming object, and the groove has a second distance from the target to the groove greater than a first distance from the target to the film-forming object The groove is surrounded by the ring plate, and the groove includes a curved surface for preventing the back surface from being deposited on the back surface of the object to prevent the film-forming particles released from the target from accumulating on the back surface of the film-forming object. The film forming apparatus according to claim 1, wherein the curved surface of the anti-backside film is included in a curved surface having a radius of curvature in a cross section along the normal direction of the platform. The film forming apparatus according to claim 1 or 2, wherein the groove includes an inner wall away from the outer side of the platform and an inner wall close to the inner surface of the platform, and the curved surface of the backside prevention film is provided on the outer inner wall in the groove. The film forming apparatus according to claim 1 or 2, wherein the groove includes an inner wall away from the outer side of the platform and an inner wall close to the inner surface of the platform, and the curved surface of the backside prevention film is provided in the inner wall in the groove. The film forming apparatus according to claim 1 or 2, wherein the curved surface of the anti-backside film is formed in an arc shape in a cross section along the normal direction of the platform. The film forming apparatus according to claim 1 or 2, wherein the curved surface of the anti-backside film is formed in an elliptical shape in a cross section along the normal direction of the platform. The film forming apparatus according to claim 1 or 2, wherein in the groove, the curved surface of the anti-backside film is away from the inner wall of the outer side of the platform, and from the back side of the film-forming object in a direction toward the outer side of the platform From the position of the junction where the platform protrudes, toward the lower side of the level of the normal direction of the side surface of the platform, draw a straight line extending the maximum angle θ with respect to the above level by sputtering, in this case The position of the upper end of the outer inner wall is higher than the position where the straight line intersects the outer inner wall. The film-forming apparatus according to claim 1 or 2, wherein in the groove, the curved surface of the back-side film-preventing surface is a vertical cross-section away from the inner wall of the outer side of the platform, and is perpendicular to the normal direction of the side surface of the platform A straight line connecting the center of curvature of the curved surface of the back surface prevention film and the junction of the back surface of the film-formed object protruding from the platform in a direction toward the outside of the platform, in which case, the straight line is relative to The angle formed horizontally on the lower side is set to be greater than the maximum angle θ of the sputtering release. The film forming apparatus according to claim 1 or 2, wherein the shape of the above-mentioned platform is circular or rectangular when viewed from the above-mentioned target. An annular plate used in the film-forming apparatus according to claim 1 or 2.