Projection system and projection device

Abstract

To provide a projection system that makes sound easy to hear while keeping manufacturing costs down. [Solution] The projection system of the present invention comprises a projection device having a speaker and a holding member for holding the projection device. The holding member comprises a holding member body for holding the projection device and a horn provided on the holding member body, the cross-sectional area of ​​the sound propagation space emitted from the speaker increasing from the inlet to the outlet. The outlet of the horn is open to the external space of the holding member body.

Description

Technical Field

[0001] The present invention relates to a projection system and a projection device.

Background Art

[0002] A projector incorporating a speaker has been conventionally known. According to this type of projector, viewers can enjoy video with sound without connecting an external speaker to the projector. Patent Document 1 below discloses a projector including an outer housing, an inner housing disposed inside the outer housing, and a speaker housed in a part of the inner housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the projector of Patent Document 1, a plurality of holes are provided at positions corresponding to the speaker of the outer housing, and the sound emitted from the speaker is released to the external space through the plurality of holes. In this configuration, part of the sound is absorbed by the outer housing or reverberates inside the outer housing. Therefore, there is a possibility that it is difficult for the viewer to hear the sound, and it is desired to provide a projection system in which the sound is easier to hear.

Means for Solving the Problems

[0005] To solve the above problems, a projection system according to one aspect of the present invention comprises a projection device having a speaker and a holding member for holding the projection device. The holding member comprises a holding member body for holding the projection device and a horn provided on the holding member body, the cross-sectional area of ​​the sound propagation space emitted from the speaker increasing from the inlet to the outlet. The outlet of the horn is open to the external space of the holding member body.

[0006] A projection device according to one aspect of the present invention comprises a projection device body having a speaker, and a horn detachably provided to the projection device body, wherein the cross-sectional area of ​​the sound propagation space emitted from the speaker increases from the inlet to the outlet. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view showing the projection system of the first embodiment. [Figure 2] This is a front view showing the front cover and front panel removed. [Figure 3] This is a side view of the horn. [Figure 4] This is a front view of the horn. [Figure 5] This graph shows the relationship between the length and cross-sectional area of ​​the horn. [Figure 6] This is a perspective view showing the projection system of the second embodiment. [Figure 7] This is a perspective view showing the front cover and front panel removed. [Figure 8] This is a perspective view showing the projection system of the third embodiment. [Figure 9] This is a perspective view showing a projector according to the fourth embodiment. [Modes for carrying out the invention]

[0008] [First Embodiment] The first embodiment of the present invention will be described below with reference to Figures 1 to 5. In the following drawings, the dimensions of each component may be shown on a different scale to make them easier to see.

[0009] Figure 1 is a perspective view showing the external appearance of the projection system 10 of this embodiment. Figure 2 is a front view showing the projection system 10 of Figure 1 with the front cover 21 and front plate 20 removed. As shown in Figures 1 and 2, the projection system 10 of this embodiment comprises a projector 11 and a cabinet 12. The projector 11 emits image light toward a projection surface such as a screen. The cabinet 12 holds the projector 11 housed inside. The projector 11 of this embodiment corresponds to the projection device of the claims. The cabinet 12 of this embodiment corresponds to the holding member of the claims.

[0010] In the following description, with the cabinet 12 placed on the floor, the axis running along the left-right direction of the cabinet 12 is defined as the X-axis, the axis running along the depth direction of the cabinet 12 is defined as the Y-axis, and the axis running along the height direction of the cabinet 12 is defined as the Z-axis. That is, from the viewer's perspective, the left-right direction corresponds to the X-axis direction, the depth direction corresponds to the Y-axis direction, and the up-down direction corresponds to the Z-axis direction. Also, in the following description, from the viewer's perspective, the front surface of each component is referred to as the front, and the back surface of each component is referred to as the back.

[0011] As shown in Figures 1 and 2, the cabinet 12 comprises a cabinet body 13, a horn 14, and a propagation tube 15. The cabinet body 13 is a hollow, box-shaped member that houses the projector 11 in its internal space.

[0012] As shown in Figure 1, the top plate 13A of the cabinet body 13 is provided with an opening 13H for emitting image light from the projector 11 into the external space. The projector 11 in this embodiment is an ultra-short-throw type reflective projector. However, the type of projector 11 is not limited to an ultra-short-throw type reflective projector. The image light emitted from the projector 11 is emitted through the opening 13H diagonally upward (towards the rear and +Y and +Z sides) in Figure 1. Furthermore, as will be described later, the projector 11 is equipped with a speaker 17 and can supply sound to the viewer.

[0013] Casters 19 are provided at each of the four corners of the bottom plate 13B of the cabinet body 13. This allows the user of the projector 11 to easily move the projection system 10 to the desired location.

[0014] The front of the cabinet body 13 consists of two front panels 20 and a front cover 21. The front panels 20 are made of, for example, wood and extend vertically on the right and left sides of the front of the cabinet body 13. The front cover 21 is positioned between the two front panels 20. Although detailed illustrations are omitted, the front cover 21 consists of a metal plate with numerous holes and a highly breathable fabric. As a result, sound emitted from the projector 11 is released into the external space of the cabinet 12 through the front cover 21.

[0015] As shown in FIG. 2, a shelf board 13C is provided on the cabinet main body 13. The internal space of the cabinet main body 13 is generally partitioned into two spaces by the shelf board 13C. A projector 11 is accommodated in the upper space of the cabinet main body 13. A horn 14 is accommodated in the lower space of the cabinet main body 13. Below the shelf board 13C, an internal video interface 22, an internal power tap 23, etc. are provided. The internal video interface 22 is a port for video or audio and has ports such as MIDI (Musical Instrument Digital Interface), USB (Universal Serial Bus). A power cord of the projector 11 is connected to the internal power tap 23, and AC power is supplied from a power outlet (not shown).

[0016] Speakers 17 are provided at the right and left ends of the front surface of the projector 11, respectively. The sound emitted from the speakers 17 is propagated to the horn 14 through the propagation pipe 15 and is emitted to the external space with the sound pressure increased by the horn 14.

[0017] FIG. 3 is a side view of the horn 14. FIG. 4 is a front view of the horn 14. As shown in FIGS. 3 and 4, the horn 14 is a member having a frustum-shaped cylindrical shape. The opening on the narrow side of the horn 14 is the sound inlet 14A, and the opening on the wide side of the horn 14 is the sound outlet 14B. The outlet 14B of the horn 14 is open to the external space of the cabinet main body 13. Although the above-mentioned front cover 21 shown in FIG. 1 is arranged outside the outlet 14B of the horn 14, since the front cover 21 is composed of a metal plate having holes and a breathable cloth, the outlet 14B of the horn 14 is not substantially sealed and is open to the external space of the cabinet main body 13.

[0018] The space inside the horn 14 functions as a propagation space for the sound emitted from the speaker 17, and the cross-sectional area of the propagation space gradually increases from the inlet 14A to the outlet 14B of the horn 14. Here, the "cross-sectional area" refers to the cross-sectional area when the horn 14 is cut by a plane perpendicular to the central axis K of the horn 14. The horn 14 is fixed to an arbitrary part of the cabinet body 13, such as a member like the shelf board 13C. Also, the material of the horn 14 is not particularly limited.

[0019] The shape of the horn 14 is not particularly limited, but as shown in FIG. 3, it is desirable that the shape of the side surface when the horn 14 is viewed from a direction perpendicular to the central axis K is hyperbolic. That is, it is desirable that the horn 14 is a so-called hyperbolic horn. According to the horn 14 of the present embodiment, a high propagation efficiency can be obtained in a wide frequency band compared to horns of other shapes.

[0020] FIG. 5 is an example of a graph showing the relationship between the length and the cross-sectional area of the horn 14. In FIG. 5, the horizontal axis represents the length (mm) of the horn 14, and the vertical axis represents the cross-sectional area of the horn (m 2 ²). The length of the horn 14 is the distance between the inlet 14A and the outlet 14B of the horn 14. In the case of a hyperbolic horn, the relationship between the length and the cross-sectional area of the horn 14 increases in a hyperbolic shape as shown in the graph of reference sign A in FIG. 5. Also, instead of the hyperbolic horn, horns having the shapes shown in the graphs of reference signs B and C in FIG. 5 may be used.

[0021] For example, in the case of the horn shown in the graph of reference sign B, the relationship between the length and the cross-sectional area of the horn increases linearly. This type of horn is also called a conical horn, and the manufacture of the horn is easy. Also, in the case of the horn shown in the graph of reference sign C, the relationship between the length and the cross-sectional area of the horn increases stepwise. In this horn, the shape of the step follows a hyperbola, and propagation characteristics similar to those of a hyperbolic horn can be obtained. When the processing of the curved surface of the hyperbolic horn is difficult, according to the horn shown in the graph of reference sign C, the manufacture can be facilitated and the propagation characteristics of the hyperbolic horn can be obtained pseudo. In addition, a horn having an exponential function type side surface shape or the like may be used.

[0022] As shown in Figure 4, the shape of the horn 14 as viewed from the direction of the central axis K is rectangular. However, the shape of the horn 14 as viewed from the direction of the central axis K is not limited to a rectangle; it may be a square, a circle, an ellipse, or any other shape. In this embodiment, sound emitted from two speakers 17 is propagated to one horn 14 by two propagation tubes 15, but the cabinet body 13 may be equipped with two horns, and the sound emitted from each speaker is propagated to each horn.

[0023] The propagation tube 15 is a tubular member provided in the cabinet body 13 for propagating sound emitted from the speaker 17 to the horn 14. As shown in Figure 2, the inlet 15A of the propagation tube 15 is positioned opposite the speaker 17. In this embodiment, the speaker 17 and the inlet 15A of the propagation tube 15 are spaced apart, but the speaker 17 and the inlet 15A of the propagation tube 15 may be in contact with each other via an elastic member such as a sponge. On the other hand, the outlet 15B of the propagation tube 15 is positioned opposite the inlet 14A of the horn 14. In this embodiment, the propagation tube 15 is made of a cylindrical member, but it may be made of a tubular body of other shapes such as a rectangular tube.

[0024] In this embodiment, as shown in Figure 2, the inlet 14A of the horn 14 is not positioned opposite the speaker 17 in the cabinet body 13. Therefore, the propagation tube 15 is routed from the speaker 17 to the horn 14 in a shape that bends in various directions between the inlet 15A and the outlet 15B of the propagation tube 15.

[0025] Specifically, for example, the propagation tube 15 on the left side of Figure 2 extends from the inlet 15A facing the speaker 17 toward the front (-Y side), bends approximately 90 degrees toward the bottom (-Z side), bends approximately 90 degrees toward the back (+Y side), bends approximately 90 degrees toward the right (+X side), bends approximately 90 degrees toward the front (-Y side), and its outlet 15B faces the inlet 14A of the horn 14. In contrast, the propagation tube 15 on the right side of Figure 2 is configured symmetrically to the propagation tube 15 on the left side. The propagation tube 15 is fixed to any member of the cabinet body 13.

[0026] In this embodiment, the propagation pipe 15 is composed of multiple pipe bodies, and has a section where the inlet pipe body and the outlet pipe body are connected via a joint. With this configuration, the propagation pipe 15 can be easily manufactured using existing pipe bodies. Alternatively, the propagation pipe 15 may be formed from a single pipe body extending from the inlet 15A to the outlet 15B. In this embodiment, the propagation pipe 15 is composed only of substantially straight sections, but it may also have, for example, curved sections. The material of the propagation pipe 15 is not particularly limited.

[0027] As shown in Figure 4, the shape of the inlet 14A of the horn 14 encompasses the shape of the outlet 15B of the propagation tube 15. That is, the shape of the inlet 14A of the horn 14 is rectangular, and the shape of the outlet 15B of the propagation tube 15 is circular. Although their shapes are different, the area of ​​the inlet 14A of the horn 14 is larger than the area of ​​the outlet 15B of the propagation tube 15. With this configuration, sound radiated from the propagation tube 15 toward the horn 14 is less likely to leak outside the horn 14, and sound propagation loss can be reduced. In this embodiment, the shapes of the inlet 14A and the outlet 14B of the horn 14 are similar rectangles, but they do not necessarily have to be similar, and the ratio of the dimensions in the width direction (X-axis direction) and the ratio of the dimensions in the height direction (Z-axis direction) may be different.

[0028] (Effects of the first embodiment) The projection system 10 of this embodiment comprises a projector 11 having a speaker 17, and a cabinet 12 that holds the projector 11. The cabinet 12 comprises a cabinet body 13 that holds the projector 11, and a horn 14 provided on the cabinet body 13, the cross-sectional area of ​​the sound propagation space emitted from the speaker 17 increasing from the inlet to the outlet. The outlet 14B of the horn 14 is open to the external space of the cabinet body 13.

[0029] As described above, in the projector of Patent Document 1, the speaker is located inside the outer casing, and the sound emitted from the speaker is released into the outside space only through multiple holes provided in the outer casing. Therefore, some of the sound is absorbed by the outer casing or reverberates inside the outer casing. As a result, there is a risk that the viewer may have difficulty hearing the sound.

[0030] To address this issue, the projection system 10 of this embodiment includes a horn 14 in the cabinet 12, which improves the overall propagation efficiency of the sound path from the speaker 17 to the horn 14 compared to a system without a horn. As a result, even if the output volume of the speaker 17 remains the same, the sound pressure at the viewer's position, which is further away from the speaker 17, increases. This makes it possible to provide a projection system 10 that makes the sound easier for the viewer to hear compared to conventional systems. Because the projection system 10 of this embodiment can produce a high volume, it is also suitable for use in large conference rooms, open spaces, etc. Furthermore, with the projection system 10 of this embodiment, the sound pressure can be increased simply by housing an existing projector 11 in the cabinet 12, eliminating the need to install a high-quality speaker in the projector 11. This helps to suppress the increase in the manufacturing cost of the projector 11.

[0031] Furthermore, in the projection system 10 of this embodiment, the cabinet 12 is provided with a propagation tube 15 attached to the cabinet body 13, which propagates sound emitted from the speaker 17 to the horn 14. The inlet 15A of the propagation tube 15 is positioned opposite the speaker 17, and the outlet 15B of the propagation tube 15 is positioned opposite the inlet 14A of the horn 14.

[0032] The projection system 10 of this embodiment basically utilizes a conventional cabinet that did not have a horn, and the horn 14 is placed in the space below the shelf 13C located below the projector 11. As a result, the inlet 14A of the horn 14 is not positioned to face the speaker 17, and a propagation tube 15 is required to propagate the sound emitted from the speaker 17 to the horn 14. However, it is conceivable that using this type of propagation tube will cause a decrease in sound pressure as the sound propagates through the tube.

[0033] To address this issue, in the projection system 10 of this embodiment, since the cabinet 12 is equipped with a horn 14, even if the sound pressure is reduced by the propagation tube 15, the sound pressure reduction can be compensated for by the sound pressure enhancement effect of the horn 14. In this way, by using the propagation tube 15, it is possible to provide a projection system 10 in which the sound is easy for the viewer to hear, while increasing the degree of freedom in the placement of the horn 14. The inner diameter of the propagation tube 15 may be constant from the inlet 15A to the outlet 15B, or it may increase from the inlet 15A to the outlet 15B. In the latter case, the reduction in sound pressure due to the propagation tube 15 can be suppressed.

[0034] The inventors conducted experiments to demonstrate the effects of the present invention. According to these experiments, by placing the propagation tube and horn opposite the speaker, it was confirmed that the sound pressure increased by several dB compared to the case of the speaker alone, when measured at a distance of several meters from the exit of the horn.

[0035] [Second Embodiment] A second embodiment of the present invention will be described below with reference to Figures 6 and 7. Since the basic configuration of the projection system in this embodiment is the same as in the first embodiment, a description of the common parts will be omitted. Figure 6 is a perspective view showing the projection system 30 of the second embodiment. Figure 7 is a perspective view showing the projection system 30 of Figure 6 with the front cover 21 and front plate 35 removed. In Figures 6 and 7, components common to the drawings used in the first embodiment are denoted by the same reference numerals.

[0036] As shown in Figures 6 and 7, the projection system 30 of this embodiment comprises a projector 11 and a cabinet 32. The cabinet 32 ​​comprises a cabinet body 33 and a horn 34.

[0037] As shown in Figure 6, openings 35H are provided at the top of the left and right front panels 35 of the cabinet 32 ​​to release sound emitted from the speaker 17 into the outside space. The cabinet body 33 is provided with an opening 33H to emit image light from the projector 11.

[0038] As shown in Figure 7, the horns 34 are positioned in the cabinet body 33, facing the left and right speakers 17 of the projector 11. The horns 34 are fixed, for example, to the top plate 33A and shelf plate 33C of the cabinet body 33, but not to the projector 11. The inlet 34A of the horns 34 and the speakers 17 may be spaced apart from each other or in contact with each other. As a result, the inlet 34A of the horns 34 is positioned facing the speakers 17. On the other hand, the outlet 34B of the horns 34 is open to the external space of the cabinet body 33. Thus, while the cabinet 12 of the first embodiment was equipped with a propagation tube 15, the cabinet 32 ​​of this embodiment is not equipped with a propagation tube 15.

[0039] In this embodiment, a front view of the horn 34 is omitted, but the shape of the inlet 34A of the horn 34 encompasses the shape of the cone of the speaker 17. That is, the shape of the inlet 34A of the horn 34 is rectangular, and the shape of the cone of the speaker 17 is circular; although their shapes are different, the area of ​​the inlet 34A of the horn 34 is larger than the area of ​​the cone of the speaker 17. With this configuration, sound radiated from the cone of the speaker 17 to the horn 34 is less likely to leak to the outside of the horn 34, and sound propagation loss can be reduced. The other components of the projection system 30 are the same as those of the projection system 10 in the first embodiment.

[0040] (Effects of the second embodiment) In this embodiment as well, the same effects as in the first embodiment can be obtained, such as being able to provide a projection system 30 in which viewers can easily hear the sound, while suppressing the soaring manufacturing costs of the projector 11.

[0041] In the projection system 30 of this embodiment, since the cabinet 32 ​​does not have a propagation tube 15, there is no risk of sound pressure reduction due to the propagation tube 15 as described in the first embodiment, and the sound pressure enhancement effect of the horn 34 can be fully realized. In addition, since the propagation tube 15 is unnecessary, the number of parts in the projection system 30 can be reduced.

[0042] [Third Embodiment] A third embodiment of the present invention will be described below with reference to Figure 8. Figure 8 is a perspective view showing the projection system 40 of the third embodiment. In Figure 8, the same reference numerals are used for components that are common to the drawings used in the first embodiment.

[0043] In the first and second embodiments, examples of floor-standing projection systems were given. In contrast, this embodiment provides an example of a wall-mounted projection system. As shown in Figure 8, the projection system 40 of this embodiment comprises a projector 11 and a suspension bracket 42. The suspension bracket 42 comprises a suspension bracket body 43 and a horn 44. The suspension bracket 42 of this embodiment corresponds to the holding member of the claims. The suspension bracket body 43 of this embodiment corresponds to the holding member body of the claims.

[0044] The suspension bracket body 43 comprises a wall fixing part 45, a suspension part 46, and a sheet metal 47. The wall fixing part 45 is a component for fixing the projection system 40 to the wall. The suspension part 46 extends horizontally from the wall fixing part 45 and suspends the projector 11. The sheet metal 47 is fixed to the suspension part 46.

[0045] The horn 44 is positioned opposite each of the left and right speakers 17 of the projector 11. The horn 44 is integrally formed with the sheet metal 47 of the suspension bracket 42. The horn 44 is positioned opposite each of the speakers 17 when the projector 11 is attached to the suspension bracket 42. This configuration simplifies the mounting structure of the horn 44 and makes it easy to align the horn 44. The inlet of the horn 44 and the speakers 17 may be spaced apart from each other or may be in contact with each other. The outlet 44B of the horn 44 is open to the external space of the projection system 40.

[0046] In this embodiment, as in the second embodiment, the shape of the inlet of the horn 44 encompasses the shape of the cone of the speaker 17. That is, the area of ​​the inlet of the horn 44 is larger than the area of ​​the cone of the speaker 17. With this configuration, sound radiated from the cone of the speaker 17 toward the horn 44 is less likely to leak out of the horn 44, and sound propagation loss can be reduced.

[0047] (Effects of the third embodiment) In this embodiment as well, the same effects as in the first embodiment can be obtained, such as providing a projection system 40 in which viewers can easily hear the sound, while suppressing the soaring manufacturing costs of the projector 11.

[0048] [Fourth Embodiment] A fourth embodiment of the present invention will be described below with reference to Figure 9. Figure 9 is a perspective view showing the projector 51 of the fourth embodiment.

[0049] As shown in Figure 9, the projector 51 of this embodiment comprises a projector body 52, a propagation tube 53, and a horn 54. In the first to third embodiments, examples of projection systems in which the projector 11 is held by holding members such as a cabinet and suspension brackets were given, but in this embodiment, an example in which the projector 51 is used alone will be given and explained. The projector 51 of this embodiment corresponds to the projection device in the claims. The projector body 52 of this embodiment corresponds to the projection device body in the claims.

[0050] The projector body 52 has a speaker 17. In this embodiment, the speaker 17 is installed on the top surface 52A of the projector body 52. ​​However, the position of the speaker 17 is not necessarily limited to the top surface 52A of the projector body 52; for example, it may be located on the side of the projector body 52.

[0051] The propagation tube 53 is detachably installed on the upper surface 52A of the projector body 52, in a position opposite the speaker 17. The propagation tube 53 is composed of a tube that extends vertically from the projector body 52. ​​Specifically, the propagation tube 53 is detachably fitted into, for example, a circular groove provided on the upper surface 52A of the projector body 52. ​​Alternatively, the propagation tube 53 may simply rest on the upper surface 52A of the projector body 52.

[0052] The horn 54 is positioned opposite the outlet 53B of the propagation tube 53. The horn 54 is connected to the propagation tube 53 via a number of pins 55 arranged along the circumference of the propagation tube. The horn 54 has a cross-sectional area of ​​the sound propagation space for the sound emitted from the speaker 17 that increases from the inlet to the outlet. In this way, the horn 54 is detachably installed on the projector body 52. ​​The outlet 54B of the horn 54 is open to the external space of the projector 51.

[0053] (Effects of the fourth embodiment) According to this embodiment, sound pressure can be improved simply by attaching a propagation tube 53 and a horn 54 to the projector body 52, without having to incorporate a high-quality speaker into the projector body 52. ​​This makes it possible to provide a projector 51 in which viewers can easily hear the sound, while keeping the manufacturing cost of the projector body 52 down.

[0054] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. In the above embodiment, the horn has a shape in which the central axis extends in a straight line from the inlet to the outlet. However, instead of this configuration, the horn may have a shape in which the central axis is bent or curved between the inlet and the outlet. For example, if the speaker is placed on the side of the projector, a horn may be used in which the inlet faces the side of the projector, the central axis of the horn is bent at a 90-degree angle, and the outlet of the horn faces forward.

[0055] In the third embodiment described above, an example of a wall-mounted projection system was given, but the present invention may also be applied to a ceiling-suspended projection system. In that case, a ceiling fixing part may be provided instead of the wall fixing part of the suspension bracket in the third embodiment.

[0056] Furthermore, the specific details regarding the materials, number, and arrangement of each component of the projection system are not limited to the above embodiment and can be modified as appropriate.

[0057] [Summary of this disclosure] A summary of this disclosure is provided below.

[0058] (Note 1) A projection device having a speaker, A holding member for holding the projection device, Equipped with, The aforementioned retaining member is The holding member body that holds the projection device, A horn is provided on the main body of the holding member, and the cross-sectional area of ​​the sound propagation space emitted from the speaker is increased from the inlet to the outlet, Equipped with, A projection system in which the outlet of the horn is open to the external space of the holding member body.

[0059] According to the configuration described in Appendix 1, simply by holding the existing projection device in the holding member, the sound pressure of the sound emitted from the speaker can be increased by the horn of the holding member. Therefore, there is no need to install a high-quality speaker in the projection device, and it is possible to provide a projection system in which the sound is easy for viewers to hear while keeping the manufacturing cost of the projection device down.

[0060] (Note 2) The projection system according to Appendix 1, wherein the holding member is a cabinet for housing the projection device.

[0061] According to the configuration described in Appendix 2, a projection system equipped with a stationary cabinet can be provided.

[0062] (Note 3) The holding member further comprises a propagation tube provided on the main body of the holding member for propagating sound emitted from the speaker to the horn. The inlet of the propagation tube is positioned opposite the speaker. The projection system as described in Appendix 2, wherein the outlet of the propagation tube is positioned opposite the inlet of the horn.

[0063] According to the configuration described in Appendix 3, the sound emitted from the speaker is propagated to the horn's entrance via a propagation tube, thus increasing the flexibility of the horn's placement.

[0064] (Note 4) The projection system according to Appendix 3, wherein the shape of the inlet of the horn includes the shape of the outlet of the propagation tube.

[0065] According to the configuration described in Appendix 4, the sound radiated from the outlet of the propagation tube to the inlet of the horn is less likely to leak outside the horn, thereby reducing sound propagation loss.

[0066] (Note 5) The inlet of the horn is not positioned on the holding member body opposite the speaker. The projection system according to Appendix 3 or Appendix 4, wherein the propagation tube is bent or curved between the inlet and outlet of the propagation tube.

[0067] According to the configuration described in Appendix 5, the horn's entrance is not positioned opposite the speaker, which further increases the flexibility of the horn's placement.

[0068] (Note 6) The projection system according to Appendix 2, wherein the inlet of the horn is positioned on the main body of the holding member opposite the speaker.

[0069] According to the configuration described in Appendix 6, since a propagation tube is not required, the sound pressure enhancement effect of the horn can be fully utilized, and the number of parts in the projection system can be reduced.

[0070] (Note 7) The projection system according to Appendix 6, wherein the shape of the inlet of the horn encompasses the shape of the cone of the speaker.

[0071] According to the configuration described in Appendix 7, sound radiated from the speaker cone to the horn entrance is less likely to leak outside the horn, thereby reducing sound propagation loss.

[0072] (Note 8) The projection system as described in Appendix 1, wherein the holding member is a suspension fitting for suspending the projection device.

[0073] According to the configuration described in Appendix 8, a suspended projection system can be provided.

[0074] (Note 9) The projection system according to Appendix 8, wherein the inlet of the horn is positioned on the main body of the holding member opposite the speaker.

[0075] According to the configuration described in Appendix 9, since a propagation tube is not required, the sound pressure enhancement effect of the horn can be fully utilized, and the number of parts in the projection system can be reduced.

[0076] (Note 10) The projection system according to Appendix 8 or Appendix 9, wherein the horn is formed integrally with the sheet metal of the suspension bracket.

[0077] According to the configuration described in Appendix 10, the mounting structure of the horn can be simplified.

[0078] (Note 11) The projection system according to Appendix 9 or Appendix 10, wherein the shape of the inlet of the horn encompasses the shape of the cone of the speaker.

[0079] According to the configuration described in Appendix 11, sound radiated from the speaker cone to the horn entrance is less likely to leak outside the horn, thus reducing sound propagation loss.

[0080] (Note 12) The projection system described in any one of the appendices 1 to 11, wherein the horn is a hyperbolic horn.

[0081] According to the configuration described in Appendix 12, high propagation efficiency can be obtained over a wide frequency band compared to other horn shapes.

[0082] (Note 13) A projection device body having a speaker, A horn is detachably attached to the projection device body, and the cross-sectional area of ​​the sound propagation space emitted from the speaker increases from the inlet to the outlet. A projection device equipped with the following features.

[0083] According to the configuration described in Appendix 13, the sound pressure of the audio emitted from the speaker can be increased simply by attaching a horn to the existing projection device body. Therefore, there is no need to install a high-quality speaker in the projection device body, and it is possible to provide a projection device that allows viewers to easily hear the audio while keeping the manufacturing costs of the projection device down. [Explanation of Symbols]

[0084] 10, 30, 40… Projection system, 11, 51… Projector (projection device), 12, 32… Cabinet (holding member), 13, 33… Cabinet body (holding member body), 14, 34, 44, 54… Horn, 14A… Horn inlet, 14B… Horn outlet, 15, 53… Propagation tube, 15A… Propagation tube inlet, 15B… Propagation tube outlet, 17… Speaker, 42… Hanging bracket (holding member), 43… Hanging bracket body (holding member body), 47… Sheet metal, 52… Projector body (projection device body).

Claims

1. A projection device having a speaker, A holding member for holding the projection device, Equipped with, The aforementioned retaining member is The holding member body that holds the projection device, A horn is provided on the main body of the holding member, and the cross-sectional area of ​​the sound propagation space emitted from the speaker is increased from the inlet to the outlet, Equipped with, A projection system in which the outlet of the horn is open to the external space of the holding member body.

2. The projection system according to claim 1, wherein the holding member is a cabinet for housing the projection device.

3. The holding member further comprises a propagation tube provided on the main body of the holding member for propagating sound emitted from the speaker to the horn. The inlet of the propagation tube is positioned opposite the speaker. The projection system according to claim 2, wherein the outlet of the propagation tube is positioned opposite the inlet of the horn.

4. The projection system according to claim 3, wherein the shape of the inlet of the horn includes the shape of the outlet of the propagation tube.

5. The inlet of the horn is not positioned on the holding member body opposite the speaker. The projection system according to claim 3 or 4, wherein the propagation tube is bent or curved between the inlet and outlet of the propagation tube.

6. The projection system according to claim 2, wherein the inlet of the horn is positioned on the holding member body opposite the speaker.

7. The projection system according to claim 6, wherein the shape of the inlet of the horn includes the shape of the cone of the speaker.

8. The projection system according to claim 1, wherein the holding member is a suspension fitting for suspending the projection device.

9. The projection system according to claim 8, wherein the inlet of the horn is positioned on the holding member body opposite to the speaker.

10. The projection system according to claim 8 or 9, wherein the horn is formed integrally with the sheet metal of the suspension bracket.

11. The projection system according to claim 9, wherein the shape of the inlet of the horn includes the shape of the cone of the speaker.

12. The projection system according to claim 1, wherein the horn is a hyperbolic horn.

13. A projection device body having a speaker, A horn is detachably attached to the projection device body, and the cross-sectional area of ​​the sound propagation space emitted from the speaker increases from the inlet to the outlet. A projection device equipped with the following features.

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