JP2016145850A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that can be easily assembled to a ceiling and is hard to stand out when being not used.SOLUTION: A projector 1 includes: a light source portion 10; a video generation portion 20 that generates video light according to a video input signal; a light guide portion 30 that guides light from the light source portion 10 to the video generation portion 20; a projection portion 40 that projects the generated video light; a housing 50 that houses video projection elements comprising the light source portion 10, the video generation portion 20, the light guide portion 30 and the projection portion 40; and an attachment body 55 that engages the housing 50 with a ceiling portion 100. The housing 50 is formed into a cylindrical shape and is engaged in a state of being embedded in the ceiling 100 by the attachment body 55 through a hole portion 102 formed in the ceiling 100, and a projection opening 90 that emits the video light to the outside of the housing 50 is formed in a bottom surface portion 50d of the housing 50.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projector (projection display apparatus).

  Projectors (projection-type image display devices) that project various types of images on wall surfaces, floor surfaces, screens, and the like are widely known. Conventional projectors include a so-called floor-mounted projector that is placed on a table, a floor, or the like, and a so-called hanging projector that is used while suspended from the ceiling. In the case of a floor-standing projector, when the projector is not used, the projector is often in the way, and in this case, it is necessary to clear the projector from a table or the like. On the other hand, since the suspended projector is disposed in the vicinity of the ceiling, there is an advantage that even when not used, the projector does not get in the way and need not be cleaned up. The hanging type projector is disclosed in, for example, Patent Documents 1 and 2.

  In a suspended projector, a sturdy support column is attached to the upper surface of a box-shaped housing in which the main body (image projection element) of the projector is built, and a fixed support plate is attached to the ceiling. . The projector housing is supported in a suspended state via the fixing support plate and the support column. In addition, a dedicated electrical wiring or connector is separately provided and connected.

JP 2009-204902 A JP 2004-271964 A

  However, as described above, the suspension type projector requires a large-scale dedicated fixing support plate, supporting column, dedicated electric wiring, and the like. Therefore, there is a problem that it takes a lot of time and effort when the hanging type projector is attached to the ceiling. In addition, this projector has a large shape and is conspicuous, which may cause a strange feeling when not used.

  An object of the present invention is to provide a projector that can be easily assembled to a ceiling portion and is inconspicuous even when not used.

  In order to solve the above problems, a projector according to the present invention includes a video projection element that has a light source unit and projects video light, a casing that houses the video projection element, and an attachment that attaches the casing to the ceiling. The casing is cylindrical, and the casing is attached by the mounting body in a state of being embedded in the ceiling through a hole formed in the ceiling. A projection opening for emitting the image light to the outside of the housing is formed in the part.

  According to this structure, the housing | casing which accommodated the image projection element was inserted in the hole formed in the ceiling part, and it can be easily assembled | attached to the state embedded in the ceiling part with the attachment body. In addition, since the projector is arranged in a state of being embedded in the ceiling, it is hardly noticeable even when not used, and hardly causes a sense of incongruity.

  Further, the attachment body of the present invention is characterized in that it is constituted by a retaining material that opens in the radial direction in a state where the casing passes through a hole formed in the ceiling portion and is locked from the back of the ceiling. To do. According to this configuration, the projector can be easily assembled to the ceiling portion by the attachment body made of the retaining material.

  Further, the present invention is characterized in that an exhaust port for discharging air to the outside of the housing is provided at a location facing the ceiling space in the housing. According to this configuration, the air inside the housing warmed by the heat generated by the light source unit or the like can be discharged to the ceiling space, and the path through which the air warmed by the heat is projected from the light projection opening is provided. It is possible to prevent problems such as the image being shaken through. That is, for example, an exhaust port that discharges air to the outside of the housing is provided on the bottom surface of the housing, and the air heated by the internal heat passes through the lower part of the light projecting port in the indoor space. In some cases, light is refracted in air with portions having different densities, and the projected image fluctuates, resulting in a problem that the image becomes unclear or deformed. On the other hand, according to this configuration, it is possible to prevent such a problem from occurring.

  Further, the present invention is characterized in that an air inlet for sucking air into the inside of the housing is provided at a location facing the ceiling space in the housing. According to this configuration, the air in the ceiling space can be sucked from the intake port and discharged from the exhaust port to the ceiling space. As a result, air in the ceiling space is sucked in, so that the air in the indoor space where the image light is projected from the projection port is not disturbed.

  Further, the present invention is characterized in that an inclined surface is formed on an upper portion of the casing, and the exhaust port is provided on the inclined surface. According to this configuration, dust or the like can be suppressed from entering the inside of the housing through the exhaust port, as compared with the case where the exhaust port is provided in the upper surface portion of the housing.

  Further, according to the present invention, the inclined surface in which the exhaust port is formed in the housing is doubled, and the positions of the exhaust ports are viewed in a direction orthogonal to a place where the inclined surfaces overlap. It is characterized by not overlapping. According to this configuration, dust and the like can be further suppressed from entering the inside of the housing through the exhaust port.

  According to the present invention, the casing that accommodates the image projection element has a cylindrical shape, and the casing is attached to the ceiling portion by the attachment body, so that the casing can be easily attached to the ceiling portion, that is, It can be assembled without much time and effort. In addition, since the projector is arranged in a state of being embedded in the ceiling, it is hardly noticeable even when not used, and hardly causes a sense of incongruity. In addition, it is possible to assemble the projector at a place where a so-called downlight is attached using a hole in which the downlight is attached, and the effort and time at that time can be minimized.

  Further, the mounting body for locking the casing to the ceiling portion is configured by a retaining material that opens in the radial direction in a state where the casing passes through a hole formed in the ceiling portion and locks from the back of the ceiling. Therefore, it can be assembled to the ceiling part very easily. In addition, since the attachment body is made of the retaining material, the attachment body can be made of an inexpensive one. In other words, the so-called hanging type projectors that have been used in the past have required a large support fixture and support posts, which are dedicated fixtures, and have been expensive. According to the configuration, since the attachment body is configured by a so-called retaining material, there is an advantage that an inexpensive one can be used.

  In addition, by providing an exhaust port for exhausting air outside the housing at a location facing the ceiling back space in the housing, the air inside the housing warmed by the heat generated by the light source section or the like is sent to the space behind the ceiling. It is possible to prevent the occurrence of problems such as the image swaying through the path through which the air heated by the heat is projected from the projection port.

  Further, by providing an air inlet for sucking air inside the housing at a location facing the ceiling space in the housing, the air in the indoor space where the image light is projected from the projector port is not disturbed. Accordingly, it is possible to reduce the possibility that the image light projected from the light projection port is blocked by the dust due to dust dancing with the turbulent air in the indoor space. Further, it is possible to minimize leakage of sound from the indoor space through which the image light is projected to the outside through the intake port and the exhaust port. In other words, if the air inlet is formed in the bottom surface of the housing, the sound in the indoor space may leak into the ceiling space through the air inlet and the air outlet and further spread to the outside. Such problems can be prevented.

  In addition, by forming an inclined surface on the upper portion of the housing and providing the exhaust port on the inclined surface, dust and the like are discharged from the exhaust port as compared with the case where the exhaust port is provided on the upper surface of the housing. Intrusion into the inside of the housing through can be suppressed to a small extent.

  Further, the inclined surfaces of the housing in which the exhaust ports are formed are formed in a double manner, and the positions of the exhaust ports do not overlap when viewed in a direction orthogonal to the location where these inclined surfaces overlap. With this configuration, dust and the like can be further prevented from entering the inside of the housing through the exhaust port, and reliability is improved.

1 is a cross-sectional front view schematically showing a projector according to an embodiment of the invention. Partial cutaway front view of the projector Block diagram showing the configuration of the projector Schematic diagram explaining a first usage example of the projector Schematic diagram explaining a second usage example of the projector Schematic diagram explaining a third usage example of the projector Schematic diagram explaining a fourth usage example of the projector Cross-sectional front view of a projector according to another embodiment (A) And (b) is principal part front sectional drawing and the principal part top view of the projector which concerns on other embodiment. Further, a cross-sectional front view of a projector according to another embodiment Partial cutaway front view of a projector according to still another embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a sectional front view schematically showing a projector according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view of the projector, and FIG. 3 is a block diagram showing a configuration of the projector.

As shown in FIGS. 1, 2, 4 to 7, and the like, a projector (projection image display apparatus) 1 according to an embodiment of the present invention has a light source unit 10 and the like to project image light . A casing 50 that accommodates an image projection element is disposed in a state of being embedded in the ceiling portion 100 (however, as will be described later, the power supply unit 80 is disposed in the ceiling space 101).

  As shown in FIGS. 1 to 3, the projector 1 includes a light source unit 10, a video generation unit 20 that generates video light according to a video input signal, and guides light from the light source unit 10 to the video generation unit 20. A light guide unit (light guide optical system) 30, a projection unit (projection optical system) 40 that projects the generated image light onto a projection object (not shown) such as a screen, a light source unit 10, and an image generation unit 20, a control unit 70 that controls the control unit 20, a casing 50 that houses a video projection element including the light source unit 10, the video generation unit 20, the light guide unit 30, and the projection unit 40, and the casing 50 is related to the ceiling unit 100. An attachment body 55 that is attached by stopping, an air blowing unit 60 that sucks and discharges outside air into the housing 50, a control unit 70 that controls the light source unit 10, the image generation unit 20, and the like are provided.

  In this embodiment, the projector 1 further includes a power supply unit (power supply unit) 80. The power supply unit 80 is different from the casing 50 in which the image projection elements such as the light source unit 10 are accommodated. The power supply unit 80 is connected to the control unit 70 and the light source unit 10 accommodated in the housing 50 through the connection wiring 81. Note that reference numeral 82 in FIG. 2 denotes power supply indoor wiring disposed in the ceiling space 101 and is connected to the power supply unit 80.

  As shown in FIG. 1, the housing 50 has a cylindrical shape having a side surface portion 50a, an upper surface portion 50b, and a bottom surface portion 50d. Further, in this embodiment, the upper surface portion 50b has a simple planar shape with the outer side facing upward. The bottom surface portion 50d is formed of a separate member from the side surface portion 50a and the upper surface portion 50b. However, the bottom surface portion 50a is inside the lower end portion of the side surface portion 50a in a state where the light source unit 10, the video image generation unit 20, the control unit 70, etc. It is attached to. Further, in this embodiment, a hook-shaped frame portion 50c extending in a hook shape on the outer peripheral side is integrally formed on the outer periphery of the lower end portion of the side surface portion 50a of the housing 50.

  An attachment body made of a retaining member formed, for example, by bending an elastic leaf spring diagonally upward toward the outside in the radial direction at a location near the connecting portion between the side surface portion 50a and the bowl-shaped frame portion 50c in the housing 50. 55 is attached at a certain angle in the circumferential direction (for example, three places every 120 degrees). In addition, a hole portion 102 that can be assembled by inserting the casing 50 is formed at a location where the casing 50 of the projector 1 is assembled on the ceiling 100. Then, when assembling the projector 1, the upper end portion of each attachment body 55 is squeezed so as to be in close contact with the side surface portion 50 a of the housing 50, and the housing is viewed from the indoor space 110 side below the ceiling portion 100. 50 is inserted upward. When the housing 50 is passed through the hole 102, as shown in FIG. 1, each attachment body 55 is in a state of being opened outward (outer diameter direction) by its elastic force. Thereby, the ceiling part 100 is sandwiched from above and below by the attachment body 55 and the bowl-shaped frame part 50c, and the casing 50 is embedded in the ceiling part 100 (more specifically, a state in which the ceiling part 100 protrudes into the ceiling back space 101) ) And fixed. In addition, before assembling the casing 50 to the ceiling portion, the indoor wiring 82 for power supply is connected to the power source portion 80 in advance, and the hole portion 102 of the ceiling portion 100 is passed through the ceiling portion 100. (Place).

  In this embodiment, a light source unit 10, an image generation unit 20, a light guide unit 30, a projection unit 40, a blower unit 60, a control unit 70, and the like are disposed in the housing 50. Further, the bottom surface portion 50d of the housing 50 is disposed so as to face the indoor space 110 below the ceiling portion, and light projection that emits image light to the outside of the housing 50 is performed on the bottom surface portion 50d of the housing 50. A mouth 90 is formed.

  In addition, an air inlet 51 that sucks air into the housing 50 and an air outlet 52 that discharges air to the outside of the housing 50 are provided at locations facing the ceiling space 101 in the housing 50. In this embodiment, an intake port 51 is formed in the side surface portion 50 a of the housing 50, and an exhaust port 52 is formed in the upper surface portion 50 b of the housing 50. In addition, a blower 60 made of a blower fan is disposed in the upper part of the casing 50, whereby the air in the ceiling space 110 is introduced into the casing 50 through the air inlet 51 and is stored in the interior. The unit 10, the image generation unit 20, the light guide unit 30, the projection unit 40, the control unit 70, etc. are cooled and discharged from the exhaust port 52. In this embodiment, the intake port 51 is formed near the light source unit 10 that generates a large amount of heat, but is not limited thereto. Although not shown, conversely, an intake port is provided on the upper surface of the housing, an exhaust port is provided on the side surface, and the exhaust port on the side surface is sucked from the intake port on the upper surface by a blower unit including a blower fan. Or may be configured to discharge from the air.

  The light source unit 10 includes a semiconductor laser such as a laser diode, and emits a phosphor using light from the semiconductor laser as excitation light. The light guide unit 30 includes optical members such as various lenses, mirrors, and rods, and guides the light emitted from the light source unit 10 to the image generation unit 20. The video generation unit 20 uses an element such as a digital micromirror device (DMD) or a liquid crystal panel, and spatially modulates light according to a video signal. The projection unit 40 is composed of an optical member such as a lens or a mirror, and enlarges and projects the spatially modulated light onto the projection object.

(Example of projector use)
4 to 7 are schematic diagrams for explaining usage examples of the projector 1. As described above, the projector 1 is embedded in the ceiling portion 100. The projector 1 projects various images such as characters, images, and moving images on various projection objects. Further, the projector 1 can be connected to an external storage device (for example, a USB memory), and reads and displays video data stored in the external storage device. If it is desired to display a different video, it can be realized by storing desired data in an external storage device and connecting it to the projector 1. Further, the projection light amount, projection shape, and projection distortion correction of the projector 1 can be adjusted by an external control signal such as infrared rays.

  As shown in FIG. 4, for example, in a hotel or the like, the projector 1 projects guide information or the like in the hotel on a desk surface 200 as a projection target. The pressure sensor is arranged on the desk surface 200 so that the operation of the finger of the customer can be detected. The projector 1 and the pressure sensor of each desk are connected to a separately provided system control device, and the projector 1 controls the system. You may comprise so that the image | video input from an apparatus may be displayed. When the display start action of the customer is detected, the system control device transmits a menu screen to the projector 1 of the target desk, and the projector 1 projects it on the desk surface 200. The customer operates the menu with his / her finger on the desk surface 200, and adjusts the display state (rotation / enlargement / reduction, etc.), confirms the contents, and orders (first use example).

  As shown in FIG. 5, for example, the projector 1 projects images of various characters, animals, flowers, and the like on a bed 210 as a projection target in a hotel or the like. You may comprise so that an image may be selected according to a customer's age, sex, etc. (2nd usage example).

  As shown in FIG. 6, for example, in a hotel or the like, the projector 1 projects an image such as a flower or a moving image such as an overseas sea level on a hot water surface 220 placed in a bathtub as a projection object (first). Example of use 3). Further, as shown in FIG. 7, the guest room corresponding to the guest room in the hallway 230 as the projection object is guided to the guest arriving at the hotel so as to guide the guest room corresponding to the guest. And a welcome message are projected (fourth use example).

  According to this configuration, the housing 50 containing the light source unit 10 and the like is inserted into the hole 102 formed in the ceiling 100, and the housing 50 is embedded in the ceiling 100 by the attachment body 55. It can be easily assembled by being locked to. Thus, the projector 1 can be assembled to the ceiling 100 easily, that is, without much effort and time. In addition, the projector 1 can be assembled at a place where a so-called downlight is attached by using the hole 102 where the downlight is attached, and the effort and time at that time can be minimized. Can do.

  In addition, since the projector 1 is arranged in a state of being embedded in the ceiling portion 100, as shown in FIGS. 4 to 7, various images are displayed to users such as customers by using the projector 1. It is also possible to notify information and give various effects.

  Further, even when the projector 1 is not used, the projector 1 is difficult to stand out, so that no uncomfortable feeling is generated. Also, it can be used in place of the downlight by projecting an all-white image with the same illuminance and color tone as the downlight.

  Further, according to the above configuration, as described above, the projector 1 can be mounted on the ceiling portion 100 very easily by using the leaf spring retaining material as the attachment body 55. Moreover, since the attachment body 55 is comprised with the retaining material, an attachment body can be comprised with an inexpensive thing. In other words, so-called hanging type projectors that have been used in the past have required large support fixtures and support posts, which are dedicated fixtures, and have been expensive. According to the projector 1, since the attachment body 55 is made of a so-called retaining material, an inexpensive one can be used.

  Further, in the above configuration, the exhaust port 52 for exhausting air to the outside of the housing 50 is provided at a location facing the ceiling space 101 in the housing 50 (in this embodiment, the upper surface portion 50b of the housing 50). Yes. With this configuration, the air inside the casing 50 heated by the heat generated by the light source unit 10 and the like can be discharged to the ceiling back space 101, and the air heated by the internal heat is projected from the light projection port 90. It is possible to prevent problems such as the image being shaken through the light path. That is, for example, an exhaust port 52 that discharges air to the outside of the housing 50 is provided in the bottom surface portion 50d of the housing 50 so that air heated by internal heat passes below the light projecting port 90. If configured, light may be refracted in air having portions with different densities, and the projected image may fluctuate, resulting in inconveniences such as blurring or deformation. On the other hand, according to this configuration, since the air heated by the heat generated in the light source unit 10 or the like is not discharged into the indoor space 110, it is possible to prevent the occurrence of the above problem and improve the reliability. .

  Further, in the above configuration, the air inlet 51 that sucks air into the housing 50 is provided at a location facing the ceiling space 101 in the housing 50 (in this embodiment, the side surface portion 50a of the housing 50). Yes. With this configuration, air in the ceiling space 101 can be sucked into the housing 50 from the air inlet 51 and discharged from the air outlet 52 to the ceiling space 101. Thereby, since the air of the ceiling space 101 is sucked, the air of the indoor space 110 where the image light is projected from the light projection port 90 is not disturbed. Therefore, it is possible to reduce the possibility that the image light projected from the light projection port 90 is blocked by dust due to dust flying with turbulent air in the indoor space 110, and further improving the reliability. Can do.

  In addition, it is possible to minimize leakage of sound from the indoor space 110 where the image light is projected through the intake port 51 and the exhaust port 52 to the outside. That is, if the air inlet 51 is formed in the bottom surface portion 50d of the housing 50, the sound of the indoor space 110 may leak into the ceiling space 101 through the air inlet 51 and the air outlet 52 and further spread outside. According to this configuration, such a problem can be prevented.

  In the above-described embodiment, the case has been described in which the upper surface portion 50b of the housing 50 provided with the intake port 51 has a simple planar shape with the outside facing upward, but the present invention is not limited to this. . For example, as shown in FIG. 8, an inclined surface 50e may be formed on the upper portion of the housing 50, for example, a portion near the outer periphery of the upper surface portion 50b, and an exhaust port 52 may be provided on the inclined surface 50e.

  According to this configuration, dust and the like enter the inside of the housing 50 through the exhaust port 52 as compared with the case where the exhaust port 52 is provided in the upper surface portion 50 b (location facing upward) of the housing 50. Can be suppressed to a small extent.

  Further, as shown in FIGS. 9A and 9B, the inclined surface 50e in which the exhaust port 52 in the casing 50 is formed is doubled (in this embodiment, the inclined surface 50e has a substantially diameter. The positions of the exhaust ports 52 (52A, 52B) do not overlap with each other when viewed in a direction orthogonal to the place where these inclined surfaces 50e, 50e overlap (that is, doubly formed in the direction) They may be formed at different positions in the circumferential direction.

  According to this configuration, since the positions of the exhaust ports 52 (52A, 52B) are different, dust and the like can be further prevented from entering the inside of the housing 50 through the exhaust port 52, and thus more reliable. Improves.

  Further, in the above-described embodiment, the case where the single projector 1 projects alone onto the projection target has been described. However, the present invention is not limited to this, and as shown in FIG. You may project on a to-be-projected body. In this case, it is preferable that the control unit is disposed in the power supply unit provided with the power supply unit 80, and the control unit is configured to control so that an image is projected on the projection object in a composite manner.

  In the above-described embodiment, the case where a leaf spring is employed as the attachment body 55 has been described. However, the present invention is not limited to this. For example, as shown in FIG. 11, a long groove 50f having a shape extending vertically is formed in the side surface portion 50a of the housing 50, and is slidable along the long groove 50f and rotatable so as to protrude sideways. A retaining member made of a locking member may be employed as the attachment body 56. When the projector 1 is assembled to the ceiling portion 100 using the attachment body 56, the attachment body 56 is retracted into the housing 50 and stored in the hole portion 102 of the ceiling portion 100. After the body 50 is inserted, the mounting body 56 is rotated and lowered so that part of the mounting body 56 protrudes outward from the housing 50, and the ceiling portion 100 is lowered by the mounting body 56 and the bowl-shaped frame portion 50 c of the housing 50. Fix it in a clamped state.

  Even if this attachment body 56 is used, the projector 1 can be mounted on the ceiling 100 very easily. Even when this attachment body 56 is used, the attachment body 55 can be configured with an inexpensive one. However, the attachment body is not limited to the above-described structure, and is screwed to the ceiling portion 100 using the flange-shaped frame portion 50c of the housing 50, or the flange-shaped frame portion 50c is attached to the ceiling portion 100 with an adhesive. It is also possible to bond them. Further, in this case, an auxiliary frame or the like is provided in advance on the upper surface of the ceiling part 100 corresponding to the bowl-shaped frame part 50c of the housing 50, and the ceiling part 100 is sandwiched between the auxiliary frame and the bowl-shaped frame part 50c. It may be screwed to do so.

  In the above-described embodiment, the case where the air inlet 51 for sucking air into the housing 50 is provided at the location facing the ceiling space 101 in the housing 50 is described. However, the present invention is not limited to this. Alternatively, it may be provided on the bottom surface portion 50 d of the housing 50. However, in this case, it is preferable to take in air from a position away from the light projection opening 90 so that the air at the position projected from the light projection opening 90 is not disturbed and the image is not distorted by flying dust or the like.

  Moreover, although the case where the housing | casing 50 was cylindrical shape was described in the said embodiment, it is not restricted to this, Of course, the square shape of a square shape or a polygonal shape may be sufficient as the housing | casing 50. It is.

  In the above-described embodiment, the case where the projector is assembled to the ceiling of the hotel has been described as an example of use. However, the present invention is not limited to this, and the projector may be used by being mounted on various buildings or structures. it can.

1 Projector (projection display device)
DESCRIPTION OF SYMBOLS 10 Light source part 20 Image | video production | generation part 30 Light guide part (light guide optical system)
40 Projection unit (projection optical system)
DESCRIPTION OF SYMBOLS 50 Housing | casing 50a Side surface part 50b Upper surface part 50c Gutter-shaped frame part 50d Bottom surface part 51 Intake port 52 Exhaust port 55,56 Attachment body 60 Blower part 70 Control part 80 Power supply part (Power supply unit)
90 Projection opening 100 Ceiling part 101 Ceiling back space 102 Hole part 110 Indoor space

Claims (6)

An image projection element that has a light source and projects image light;
A housing for accommodating the image projection element;
An attachment for attaching the housing to the ceiling;
With
The casing has a cylindrical shape, and the casing is attached by the attachment body in a state of being embedded in the ceiling through a hole formed in the ceiling.
The projector according to claim 1, wherein a light projection port for emitting the image light to the outside of the housing is formed on a bottom surface of the housing.   The attachment body is configured by a retaining material that opens in a radial direction in a state in which the casing passes through a hole formed in the ceiling portion and is locked from the back of the ceiling. The projector described.   The projector according to claim 1, wherein an exhaust port for discharging air to the outside of the housing is provided at a location facing the ceiling space in the housing.   The projector according to claim 3, wherein an air inlet for sucking air into the housing is provided at a location facing the ceiling space in the housing.   The projector according to claim 3, wherein an inclined surface is formed on an upper portion of the housing, and the exhaust port is provided on the inclined surface.   The inclined surface on which the exhaust port is formed in the housing is formed in a double manner, and the positions of the exhaust ports do not overlap when viewed in a direction orthogonal to the location where these inclined surfaces overlap. The projector according to claim 5, wherein