JP7373741B2 - projector - Google Patents

Description

The present invention relates to a projector that projects light.

2. Description of the Related Art Projectors that include a projection section that projects light are conventionally known. As an example of this type of projector, Patent Document 1 discloses a projector that projects light from an opening provided in a housing. In this projector, after the projector is installed on the ceiling of a building, the attitude of the projection unit is adjusted using an adjustment mechanism such as a plate cam, and the projection direction of the projected light is changed.

Japanese Patent Application Publication No. 2017-173574

However, in conventional projectors, for example, when projecting with the projection unit tilted obliquely, a portion of the projected light may be blocked by the casing around the opening.

An object of the present invention is to provide a projector in which projected light is not blocked by a housing.

A projector according to one aspect of the present invention includes a projection unit that magnifies light emitted from a light output unit and projects the expanded light onto a projection target, a housing having an opening, and a rotationally movable case that allows the projection unit to rotate. The projection unit includes a projection lens and is arranged so as to pass through the opening, and the rotational movement unit projects light onto the projection object arranged along the vertical direction. and a state in which light is projected onto the projection object disposed along the horizontal direction, the projection section is rotatably movable, and the projection direction of the light of the projection section is The tip of the projection lens can be used in a state in which light is projected onto the projection object arranged along the vertical direction, and in a state in which light is projected onto the projection object arranged along the horizontal direction. In each state , it is located closer to the projection object than the opening.

According to the projector according to the present invention, projection light can be prevented from being blocked by the housing.

FIG. 3 is a cross-sectional view showing a projector of a comparative example. FIG. 1 is a diagram schematically showing an example of a usage pattern of a projector according to an embodiment. FIG. 2 is a diagram of the projector according to the embodiment viewed diagonally from above. FIG. 2 is a diagram of the projector according to the embodiment viewed diagonally from below. FIG. 3 is a cross-sectional view of the projector according to the embodiment taken along the line VV shown in FIG. 2(a). 6 is a cross-sectional view of the projector according to the embodiment taken along the line VI-VI shown in FIG. 5. FIG. FIG. 2 is a block diagram showing a control configuration of a projector according to an embodiment. FIG. 7 is a cross-sectional view of a projector according to a modification of the embodiment. FIG. 7 is a diagram showing another usage pattern of the projector according to the embodiment.

(Circumstances leading to the present invention)
The circumstances leading to the present invention will be explained with reference to a projector as a comparative example.

FIG. 1 is a sectional view showing a projector 101 of a comparative example.

The projector 101 of the comparative example includes a casing 110 embedded in a ceiling 191 of a building, a projection section 130 that magnifies and projects image light emitted from a light emitting section 120, and an attitude change mechanism that changes the attitude of the projection section 130. A mechanism (not shown) is provided.

The housing 110 has a box shape and has an opening 112 through which the light projected from the projection section 130 passes. FIG. 1 shows how the projection unit 130, tilted diagonally by the attitude change mechanism, projects the projection light L onto a projection object 180 provided on the wall of a building.

In the projector 101 of the comparative example, the entire projection section 130 including the tip 132a of the projection section 130 is arranged inside the housing 110, so that a part of the projection light L projected from the projection section 130 is directed around the opening. The problem may occur that the projection light L cannot be properly projected because it is blocked by the housing 110 of the projection light L.

In contrast, the projector of this embodiment has a structure in which the projection light projected from the projector is not blocked by the housing.

Hereinafter, embodiments will be specifically described with reference to the drawings. Note that all of the embodiments described below are specific examples of the present invention. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention. Further, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating implementation modes according to one embodiment of the present invention will be described as arbitrary constituent elements. The implementations of the invention are not limited to the present independent claims, but may also be expressed by other independent claims.

Note that each figure is a schematic diagram and is not necessarily strictly illustrated. Furthermore, in each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping explanations may be omitted or simplified.

(Embodiment)
The projector 1 according to the embodiment will be described with reference to FIGS. 2 to 7.

FIG. 2 is a diagram schematically showing an example of how the projector 1 according to the embodiment is used. The z-axis shown in FIG. 2 is an axis extending along the vertical direction, and the x-axis and y-axis are axes extending along the horizontal direction.

The projector 1 is installed, for example, on a ceiling 91 of a building. FIG. 2A shows how the projection light L emitted from the projector 1 is projected onto the wall of a building. FIG. 2B shows how the projection light L emitted from the projector 1 is projected onto the floor of a building. Note that the walls and floors of the building are examples of the projection object 80 on which the projection light L is projected. The projection object 80 is not limited to walls and floors, but may be structures such as screens or tables.

FIG. 3 is a diagram of the projector 1 viewed diagonally from above. FIG. 4 is a diagram of the projector 1 viewed diagonally from below. FIG. 5 is a cross-sectional view of the projector 1 taken along the line VV shown in FIG. 2(a). FIG. 6 is a cross-sectional view of the projector 1 taken along the line VI-VI shown in FIG. In addition, in FIG. 3, illustration of the airflow generation part 50 mentioned later is abbreviate|omitted.

As shown in FIGS. 3 to 6, the projector 1 is embedded in a ceiling 91 that partitions an indoor space s1 and an attic space s2 of the building.

As shown in FIGS. 5 and 6, the projector 1 includes a box-shaped housing 10, a light emitting section 20 that emits image light, and an enlarged image light emitted from the light emitting section 20 and projects it to the outside. A projection unit 30 is provided. The projector 1 also includes a rotational movement section 40 that allows the projection section 30 to be rotated, and an airflow generation section 50 and an exhaust duct 55 for cooling the inside of the housing 10.

The housing 10 is fitted into a ceiling opening 93 formed in a ceiling 91 and is fixed. The housing 10 has a rectangular parallelepiped shape, for example, and is made of resin or metal. The outer shape of the housing 10 is not limited to a rectangular parallelepiped shape, but may be a columnar shape.

The housing 10 includes a lower housing 11 and an upper housing 18.

The lower housing 11 has a convex shape that projects to the opposite side of the floor, that is, to the back side of the ceiling with respect to the ceiling surface 92 of the ceiling 91. Specifically, the lower housing 11 is connected to a rectangular base portion 11a, a plurality of side legs 11b extending downward from the outer edge of the base portion 11a, and each of the plurality of side legs 11b. It has a plurality of flange portions 11c. The lower housing 11 is fixed to the ceiling 91 with the flange 11c in contact with the ceiling surface 92.

The lower housing 11 is, for example, a flat metal plate. However, the lower housing 11 is not limited to a metal flat plate, and may be a resin decorative panel. The base portion 11a of the lower housing 11 may be configured with a louver in which a plurality of blades are arranged in parallel.

The base portion 11a has a slot-shaped opening 12 and a rectangular exhaust port 15. As described above, the lower housing 11 has a convex shape, so when the housing 10 is installed on the ceiling, the opening 12 and the exhaust port 15 are located opposite to the projection object 80 with respect to the ceiling surface 92. installed on the side.

A light emitting section 20, a projection section 30, a rotational movement section 40, an airflow generation section 50, and an exhaust duct 55 are arranged on the base section 11a.

The upper housing 18 has a cylindrical shape with a top surface. The upper housing 18 is arranged on the lower housing 11 so as to cover the light emitting section 20, the projection section 30, the rotational movement section 40, the airflow generation section 50, and the exhaust duct 55. The upper casing 18 has airtightness to prevent dust or dust present in the attic space s2 or living things such as insects and rats from entering.

As shown in FIGS. 5 and 6, the light emitting section 20, the projection section 30, the rotational movement section 40, the airflow generation section 50, and the exhaust duct 55 are located in a space within the housing surrounded by the lower housing 11 and the upper housing 18. It is housed in s3. Note that, although most of the projection section 30 is accommodated within the interior space s3 of the housing, a portion of the projection section 30 is located outside the interior space s3 of the housing. This will be discussed in detail later.

The light emitting unit 20 includes a light source 21 that emits light, a light modulation element 22 that modulates the light emitted from the light source 21 and emits image light, an optical system 23, a prism 24, and a case 25. . The light source 21, the light modulation element 22, the optical system 23, and the prism 24 are housed in a case 25.

The light source 21 is, for example, a mercury lamp, an LED (Light Emitting Diode), an LD (Laser Diode), or the like. The light source 21 may include a plurality of light sources that each emit red light, blue light, and green light. Light emitted from the light source 21 is guided to the light modulation element 22 by an optical system 23 such as a lens or a mirror.

The light modulation element 22 is, for example, a transmissive liquid crystal element, a reflective liquid crystal element, a DMD (Digital Micromirror Device), or the like. The light modulation element 22 in this embodiment is a DMD. The image light generated by the light modulation element 22 is emitted to the projection section 30 via the prism 24.

The projection section 30 magnifies the image light emitted from the light emitting section 20 and projects the projection light L. The projection section 30 includes a cylindrical lens barrel 31 connected to the light emitting section 20 and a projection lens 32 provided inside the lens barrel 31. A plurality of lenses including the projection lens 32 may be provided within the lens barrel 31 .

The projection section 30 is arranged so as to penetrate through the opening 12 of the lower housing 11. Note that the elongated hole-shaped opening 12 is formed to the bottom of the case 25 so that the case 25 of the light emitting part 20 does not interfere with the base part 11a of the lower housing 11.

The width of the opening 12 of the lower housing 11 is larger than the diameter of the lens barrel 31, and a gap 14 is provided between the opening 12 and the lens barrel 31. A portion of the lens barrel 31 of the projection section 30 protrudes below the opening 12. Specifically, the tip 32a of the projection lens 32 in the light projection direction p1 of the projection unit 30 is located closer to the object to be projected 80 than the opening 12. This structure prevents the projection light L from being blocked by the housing 10 in the projector 1 of this embodiment.

The rotational movement unit 40 is a swinging mechanism that changes the projection direction p1 of the light projected from the projection unit 30. The rotational movement section 40 includes a pair of rotation shafts 41 extending in the horizontal direction, a pair of supports 42 that support the light emitting section 20 and the projection section 30 via the pair of rotation shafts 41, and It has a driving section 43 that allows the light emitting section 20 and the projection section 30 to rotate (see FIG. 6). The drive unit 43 is, for example, a stepping motor or a servo motor. Note that the drive unit 43 is not limited to the above-mentioned motor, and may be, for example, a rotational position holding mechanism that maintains the position when manually rotated using friction or a link mechanism. When the projection section 30 is rotated by the rotational movement section 40, the lens barrel 31 of the projection section 30 moves along the elongated hole direction of the opening 12.

The rotational movement unit 40 enables the projection unit 30 to be rotated so that the optical axis a1 of the projection unit 30 swings around the rotation axis 41. For example, the rotational movement unit 40 is configured to project light onto a projection object 81 arranged along the vertical direction as shown in FIG. 2(a), or The projection unit 30 is rotated so that light is projected onto a projection target 82 arranged along the horizontal direction. For example, if the angle α of the optical axis a1 of the projection unit 30 when projecting light onto the projection target 82 is 0°, the angle α of the optical axis a1 when projecting light onto the projection target 81 is 45°. °.

The projector 1 may project light so that the image light moves from the floor to the wall or from the wall to the floor while the projection unit 30 is being rotated by the rotational movement unit 40. Further, the above-mentioned angle α of 45° is an example, and the projector 1 may project the projection light L in a range where the angle α of the optical axis a1 of the projection unit 30 is 0° or more and 90° or less.

Although the projection unit 30 can be rotated by the rotational movement unit 40, the tip 32a of the projection lens 32 is configured to be located closer to the projection object 81 or 82 than the opening 12 even when the projection unit 30 is rotated. That is, the tip 32a of the projection lens 32 is always located between the opening 12 and the ceiling surface 92.

Furthermore, the projection light L projected from the projection section 30 is a spread light in which the area of the projection light L (the area of the plane perpendicular to the optical axis a1) increases as the distance from the projection section 30 increases. The structure is such that this projected light L is not blocked by the lower housing 11. Specifically, the side legs 11b of the lower housing 11 have a height that does not block the projection light L.

Next, a configuration for cooling the inside of the housing 10 will be described. As described above, inside the housing 10, the light source 21, the light modulation element 22, the driving section 43, etc. are provided. Since the light source 21, the light modulation element 22, and the drive unit 43 generate heat, the housing 10 is provided with an airflow generation unit 50 and an exhaust duct 55 for cooling the inside of the housing 10.

The airflow generation section 50 includes a first airflow generation section 50a disposed near the opening 12 and a second airflow generation section 50b disposed near the exhaust port 15. The first airflow generation section 50a is, for example, an axial fan, and is fixed to the base section 11a via a support member 51. Note that the first airflow generation section 50a may be fixed to the light emitting section 20 via a support member different from the support member 51. The second airflow generating section 50b is, for example, a blower fan or a centrifugal fan, and is provided within the exhaust duct 55. The exhaust duct 55 is a duct that guides the airflow generated by the second airflow generation section 50b to the exhaust port 15. The airflow generation unit 50 takes air from the indoor space s1 into the housing 10 through the gap 14, and discharges air heated within the housing 10 from the exhaust port 15 to the indoor space s1.

The exhaust port 15 is provided on the same plane as the opening surface 13 of the opening 12. That is, the exhaust port 15 is located on the back side of the ceiling rather than the tip 32a of the projection lens 32. In other words, the tip 32a of the projection lens 32 is located closer to the projection target 81 or 82 than the exhaust port 15 is.

Further, the exhaust port 15 is provided at a position that does not overlap with the lens barrel 31 of the projection section 30 when the exhaust port 15 is viewed from the vertical direction (see FIG. 4). When viewed from the vertical direction, the exhaust port 15 and the lens barrel 31 are in a positional relationship in which they do not overlap, even when the projection section 30 rotates. In this projector 1, the exhaust port 15 is provided at a position that does not overlap with the tip 32a of the projection lens 32, and the high temperature air discharged from the exhaust port 15 passes through the optical path of the projection light L emitted from the projection unit 30. The structure makes it difficult to enter.

Next, the control configuration of the projector 1 will be explained.

FIG. 7 is a block diagram showing the control configuration of the projector 1. As shown in FIG.

As shown in FIG. 7, the projector 1 includes a light source 21, a light modulation element 22, a rotational movement section 40, an airflow generation section 50, a communication section 71, and a control section 70.

The control section 70 controls the respective operations of the light source 21, the light modulation element 22, the rotational movement section 40, the airflow generation section 50, and the communication section 71. The control unit 70 includes a CPU, a ROM, a RAM, etc., and the CPU reads a program stored in the ROM and expands it to the RAM, thereby executing various processes. Image data of an image formed by the light modulation element 22 is stored in the ROM. Note that the control unit 70 may include a nonvolatile rewritable memory instead of the ROM. Further, the control unit 70 may obtain image data from an external device or an external storage device, such as a smartphone, a PC, or a remote control, via the communication unit 71, for example.

The control unit 70 drives the light source 21 and the light modulation element 22 when the power is turned on. Thereby, for example, the projection light L from the projection unit 30 is projected toward the projection target 81 or 82. Further, the control unit 70 may acquire information regarding the projection direction p1 of the projection light L from a smartphone or the like via the communication unit 71, and control the rotational movement unit 40 to change the projection direction p1. Further, the control unit 70 drives the airflow generation unit 50 when the power is turned on. Thereby, the inside of the housing 10 of the projector 1 is cooled.

(Effects, etc.)
As described above, the projector 1 of the present embodiment includes the projection section 30 that magnifies the light emitted from the light emitting section 20 and projects it onto the projection target 80, and the housing 10 having the opening 12. The projection unit 30 has a projection lens 32 and is arranged so as to penetrate through the opening 12. The tip 32a of the projection lens 32 in the light projection direction p1 of the projection unit 30 is located closer to the object to be projected 80 than the opening 12.

In this manner, the tip 32a of the projection lens 32 is located closer to the object to be projected 80 than the opening 12, so that the projection light L projected from the projection unit 30 can be emitted from outside the housing 10. Thereby, the projection light L can be prevented from being blocked by the housing 10.

Furthermore, the projector 1 may further include a rotational movement unit 40 that allows the projection unit 30 to rotate.

In this manner, by providing the projector 1 with the rotational movement section 40, the projection direction p1 of the light projected from the projection section 30 can be changed. In this embodiment, since the tip 32a of the projection lens 32 is located closer to the object to be projected 80 than the opening 12, even if the projection section 30 rotates, the projection light L is directed toward the housing 10. It can be emitted from outside. Thereby, the projection light L can be prevented from being blocked by the housing 10.

Further, the rotational movement unit 40 may be configured to be able to rotate the projection unit 30 so that the optical axis a1 of the projection unit 30 swings around a rotation axis 41 that extends in the horizontal direction.

According to this, the projection direction p1 of the light projected from the projection section 30 can be easily changed around the rotation axis 41. In this embodiment, since the tip 32a of the projection lens 32 is located closer to the projection target 80 than the opening 12, even if the projection section 30 swings about the rotation axis 41, the projection The light L can be emitted from outside the housing 10. Thereby, the projection light L can be prevented from being blocked by the housing 10.

Further, the rotational movement unit 40 is configured to be in a state where the light is projected onto the projection target 81 arranged along the vertical direction, or a state where light is projected onto the projection target 81 arranged along the horizontal direction. The projection unit 30 may be rotatably movable.

According to this, the projection light L can be projected onto the projection object 81 such as a wall or a screen, and onto the projection object 82 such as a floor or a table. In the present embodiment, the tip 32a of the projection lens 32 is located closer to the projection object 81 or 82 than the opening 12, so when projecting light onto the projection objects 81 and 82, the projection light L is The light can be emitted from outside the housing 10. Thereby, the projection light L can be prevented from being blocked by the housing 10.

Further, the housing 10 has an exhaust port 15 for exhausting air heated within the housing 10, and the exhaust port 15 may be provided on the same surface as the opening surface 13 of the opening 12. .

In this way, by providing the exhaust port 15 on the same plane as the opening surface 13, the tip 32a of the projection lens 32 can be positioned closer to the object to be projected 80 than the exhaust port 15. Thereby, the high temperature air discharged from the exhaust port 15 can be made difficult to enter the optical path of the projection light L, and the projection light L can be projected appropriately.

The projector 1 further includes an airflow generation section 50 disposed within the housing 10, the opening 12 is provided with a gap 14 with respect to the projection section 30, and the airflow generation section 50 Air is taken into the casing 10 through a gap 14, and air heated within the casing 10 is discharged from an exhaust port 15.

According to this, the intake of air into the casing 10 and the discharge of air to the outside of the casing 10 can be realized with a simple structure, so that the inside of the casing 10 can be easily cooled. By this cooling, the image light formed within the housing 10 can be appropriately formed, so that the image included in the projection light L can be appropriately projected.

Further, the casing 10 may be fitted into a ceiling 91 of a building, and the opening 12 may be provided on the opposite side of the projection target 80 with respect to the ceiling surface 92 of the ceiling 91.

According to this, the opening 12 can be placed further back than the ceiling surface 92, and the opening 12 can be made less noticeable when the projector 1 is viewed from below.

Further, the tip 32a of the projection lens 32 may be located between the opening 12 and the ceiling surface 92.

According to this, when the projector 1 is viewed from below, the projection section 30 penetrating through the opening 12 can be made less noticeable.

(Modified example of embodiment)
Next, a projector 1A according to a modification of the embodiment will be described with reference to FIG. 8. In this modification, an example will be described in which the lower casing of the casing 10 has a flat shape instead of a convex shape.

FIG. 8 is a sectional view of the illustrated projector 1A. The projector 1A is embedded in the ceiling 91.

The projector 1A includes a box-shaped housing 10, a light emitting section 20 that emits image light, and a projection section 30 that magnifies and projects the image light to the outside. The projector 1A also includes a rotational movement section 40 that allows the projection section 30 to be rotated, and an airflow generation section 50 and an exhaust duct 55 for cooling the inside of the housing 10.

The housing 10 is fitted into a ceiling opening 93 formed in a ceiling 91 and is fixed. The housing 10 has a rectangular parallelepiped shape, for example, and is made of resin or metal. The outer shape of the housing 10 is not limited to a rectangular parallelepiped shape, but may be a columnar shape.

The housing 10 includes a lower housing 11A and an upper housing 18.

The lower housing 11A has a flat shape and is provided along the ceiling surface 92. The lower housing 11 is fixed to the ceiling 91 while being in contact with the ceiling surface 92.

The lower housing 11A is, for example, a flat metal plate. However, the lower housing 11A is not limited to a metal flat plate, and may be a decorative panel made of resin or a louver in which a plurality of wings are arranged in parallel.

The lower housing 11A has an elongated opening 12 and a rectangular exhaust port 15. When the housing 10 is installed on the ceiling, the opening 12 and the exhaust port 15 are provided on the same plane as the ceiling surface 92.

A light emitting section 20, a projection section 30, a rotational movement section 40, an airflow generation section 50, and an exhaust duct 55 are arranged in the lower housing 11A.

The upper housing 18 has a cylindrical shape with a top surface. The upper housing 18 is arranged on the lower housing 11A so as to cover the light emitting section 20, the projection section 30, the rotational movement section 40, the airflow generation section 50, and the exhaust duct 55.

As shown in FIG. 8, the light emitting section 20, the projection section 30, the rotational movement section 40, the airflow generation section 50, and the exhaust duct 55 are housed in the internal housing space s3 surrounded by the lower housing 11A and the upper housing. ing. Note that, although most of the projection section 30 is accommodated within the interior space s3 of the housing, a portion of the projection section 30 is located outside the interior space s3 of the housing.

The light emitting unit 20 includes a light source 21 that emits light, and a light modulation element 22 that modulates the light emitted from the light source 21 and emits image light.

The projection section 30 magnifies and projects the light emitted from the light emitting section 20. The projection unit 30 includes a cylindrical lens barrel 31 and a projection lens 32 provided within the lens barrel 31.

The projection section 30 is arranged so as to penetrate through the opening 12 of the lower housing 11A. The width of the opening 12 of the lower housing 11A is larger than the diameter of the lens barrel 31, and a gap 14 is provided between the opening 12 and the lens barrel 31. A portion of the lens barrel 31 of the projection section 30 protrudes below the opening 12. Specifically, the tip 32a of the projection lens 32 in the light projection direction p1 of the projection unit 30 is located closer to the object to be projected 80 than the opening 12. This structure prevents the projection light L from being blocked by the housing 10 in the projector 1A of this embodiment.

Further, the casing 10 may be fitted into a ceiling 91 of a building, and the opening 12 may be provided on the same plane as a ceiling surface 92 of the ceiling 91.

According to this, the projector 1A can be easily installed on the ceiling 91.

(Other embodiments)
Although the projector according to the present invention has been described above based on the above embodiments and modifications, the present invention is not limited to the above embodiments and modifications. For example, the present invention may have a configuration obtained by combining the above embodiments and modifications.

For example, in the projector 1 of the embodiment described above, an example was shown in which the angle α of the optical axis a1 when projecting light onto the projection target 81 was 45 degrees, but the angle α is not limited thereto. For example, as shown in FIG. 9, the projector 1 sets the angle α of the optical axis a1 to −45°, and projects light onto the projection object 80 on the other wall, which is opposite to the projection object 80 on the other wall. It's okay.

For example, in the above embodiment, the case where the airflow generation section 50 includes the first airflow generation section 50a and the second airflow generation section 50b is illustrated, but the number of airflow generation sections 50 may be at least one. . For example, the airflow generation section 50 may be only the second airflow generation section 50b.

In the embodiment described above, the exhaust port 15 is provided on the same surface as the opening surface 13 of the opening 12, but the exhaust port 15 is not limited thereto. The exhaust port 15 may be provided at a position between the opening surface 13 and the tip 32a of the projection lens 32.

For example, the exhaust port 15 may be provided with a dust filter or the like. Further, a retractable dust filter may be provided in the gap 14 between the opening 12 and the lens barrel 31.

For example, the projector 1 may include an adjustment mechanism that finely adjusts the attitude of the projection unit 30 using a screw or the like after the projector 1 is installed on the ceiling 91 or the like.

In addition, forms obtained by making various modifications to the embodiments that those skilled in the art can think of, and forms realized by arbitrarily combining the constituent elements and functions of each embodiment without departing from the spirit of the present invention. are also included in the present invention.

1, 1A Projector 10 Housing 12 Opening 13 Opening surface 14 Gap 15 Exhaust port 20 Light emitting section 30 Projection section 32 Projection lens 32a Tip 40 Rotation moving section 41 Rotating shafts 50, 50a, 50b Air flow generation section 80, 81, 82 Cover Projection body 91 Ceiling 92 Ceiling surface a1 Optical axis L Projection light p1 Projection direction

Claims (7)

a projection unit that magnifies the light emitted from the light output unit and projects it onto a projection target;
a casing having an opening;
a rotational movement section that allows the projection section to be rotationally moved;
Equipped with
The projection unit has a projection lens and is arranged so as to penetrate through the opening,
The rotational movement unit is configured to operate in a state in which light is projected onto the projection object arranged along the vertical direction, and in a state in which light is projected onto the projection object arranged along the horizontal direction. The projection unit is rotatably movable so as to be able to change the state;
The tip of the projection lens in the light projection direction of the projection unit is in a state where the light is projected onto the projection object arranged along the vertical direction, and when the projection object is arranged along the horizontal direction. The projector is located closer to the object to be projected than the opening in each state in which light is projected onto the object. The projector according to claim 1 , wherein the rotational movement section allows the projection section to be rotationally moved so that the optical axis of the projection section swings around a rotation axis extending in the horizontal direction. The casing has an exhaust port for exhausting air heated within the casing,
The projector according to claim 1 or 2 , wherein the exhaust port is provided on the same plane as the opening surface of the opening. Further, an airflow generation unit disposed within the housing,
The opening is provided so as to have a gap with respect to the projection section,
The projector according to claim 3 , wherein the airflow generation unit takes external air into the housing through the gap and discharges air heated within the housing from the exhaust port. The casing is fitted into the ceiling of a building,
The projector according to any one of claims 1 to 4 , wherein the opening is provided on the opposite side of the projection object with respect to the ceiling surface of the ceiling. The projector according to claim 5 , wherein a tip of the projection lens is located between the opening and the ceiling surface. The casing is fitted into the ceiling of a building,
The projector according to any one of claims 1 to 4 , wherein the opening is provided on the same plane as a ceiling surface of the ceiling.

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