Projection device and method for operating projection device

Abstract

This projection device includes: a projection lens part including an optical system for projecting image light onto a projection surface; and a first optical receiver and a second optical receiver that are provided in the projection lens part and receive an optical signal emitted from a remote controller. The first optical receiver is placed at a position enabling reception of an optical signal transmitted through at least a part of the optical system, and the second optical receiver is placed at a position enabling reception of an optical signal without intervention of the optical system.

Description

Projection device and method of operating the same

[0001] The disclosed technology relates to a projection device and a method of operating a projection device.

[0002] Japanese Patent Application Laid-Open Publication No. 2015-102662 describes an image projection device that includes a light-receiving sensor that detects a light signal emitted from a remote control, and whose operation and settings are remotely controlled based on the signal detected by the light-receiving sensor. The image projection device described in Japanese Patent Application Laid-Open Publication No. 2015-102662 includes a holding member that holds the light-receiving sensor and a support that supports the holding member so that the holding member can rotate around a center line. The holding member has an outline that is approximately circular or arc-shaped in a cross section perpendicular to the center line of each position along the center line of the portion exposed to the outside.

[0003] One embodiment of the technique of the present disclosure provides a projection device and a method for operating a projection device that can reduce the risk of a situation in which remote control by a remote controller becomes unavailable.

[0004] The projection device of the present disclosure comprises a projection lens unit including an optical system that projects image light onto a projection surface, and a first light receiver and a second light receiver that are provided in the projection lens unit and receive an optical signal emitted from a remote controller, the first light receiver being positioned at a position where it can receive an optical signal that has passed through at least a portion of the optical system, and the second light receiver being positioned at a position where it can receive an optical signal without passing through the optical system.

[0005] It is preferable that the device is provided with a first processor, which derives an evaluation value regarding the quality of the optical signals received by the first optical receiver and the second optical receiver, and identifies the optical signal for determining the content of the operation instruction based on the evaluation value.

[0006] It is preferable that the first processor determines the content of the operation instruction based on an optical signal, of the optical signals received by the second optical receiver, whose evaluation value satisfies a preset first condition.

[0007] It is preferable that a plurality of second optical receivers are provided, and when there are a plurality of optical signals received by the plurality of second optical receivers whose evaluation values ​​satisfy the first condition, the first processor determines the content of the operation instruction based on the optical signal with the largest evaluation value.

[0008] It is preferable that a plurality of second optical receivers are provided, and if there are a plurality of optical signals received by the plurality of second optical receivers whose evaluation values ​​do not satisfy the first condition but satisfy a second condition that is looser than the first condition, the first processor determines the content of the operation instruction based on the plurality of optical signals that satisfy the second condition.

[0009] It is preferable that the first processor determines the content of the operation instruction based on the optical signal received by the first optical receiver when: no optical signal is received by the second optical receiver; when none of the optical signals received by the second optical receiver have an evaluation value that satisfies the first condition; and when none of the optical signals received by the second optical receiver have an evaluation value that satisfies the second condition.

[0010] It is preferable that the first processor determines the content of the operation instruction based on an optical signal received by the first optical receiver whose evaluation value satisfies a third condition that is stricter than the second condition.

[0011] It is preferable that a plurality of first optical receivers are provided, and when there are a plurality of optical signals received by the plurality of first optical receivers whose evaluation values ​​satisfy the third condition, the first processor determines the content of the operation instruction based on the optical signal with the largest evaluation value.

[0012] It is preferable that the first processor controls the storage of historical information of the optical receiver that received the optical signal used to determine the content of the operation instruction in a memory unit, and identifies the optical signal for determining the content of the operation instruction based on the historical information in addition to the evaluation value.

[0013] It is preferable that the projector further comprises a main body portion provided with a projection lens portion and including an image forming unit that forms image light, and a third light receiver that is provided in the main body portion and receives the optical signal.

[0014] It is preferable that the system is provided with a second processor, which derives an evaluation value regarding the quality of the optical signals received by the first optical receiver, the second optical receiver, and the third optical receiver, and identifies an optical signal for determining the content of the operation instruction based on the evaluation value.

[0015] It is preferable that the second processor determines the content of the operation instruction based on the optical signal received by the second optical receiver and the third optical receiver, whose evaluation value satisfies a predetermined fourth condition.

[0016] If there are multiple optical signals received by the second and third optical receivers whose evaluation values ​​satisfy the fourth condition, it is preferable that the second processor determines the content of the operation instruction based on the optical signal with the largest evaluation value.

[0017] If there are multiple optical signals received by the second and third optical receivers whose evaluation values ​​do not satisfy the fourth condition but satisfy a fifth condition that is more lenient than the fourth condition, it is preferable that the second processor determines the content of the operation instruction based on the multiple optical signals that satisfy the fifth condition.

[0018] It is preferable that the second processor determines the content of the operation instruction based on the optical signal received by the first optical receiver when no optical signal is received by the second optical receiver and the third optical receiver, when there is no optical signal among the optical signals received by the second optical receiver and the third optical receiver whose evaluation value satisfies the fourth condition, and when there are no multiple optical signals among the optical signals received by the second optical receiver and the third optical receiver whose evaluation value satisfies the fifth condition.

[0019] It is preferable that the second processor determines the content of the operation instruction based on an optical signal received by the first optical receiver whose evaluation value satisfies a sixth condition that is stricter than the fifth condition.

[0020] It is preferable that a plurality of first optical receivers are provided, and when there are a plurality of optical signals received by the plurality of first optical receivers whose evaluation values ​​satisfy the sixth condition, the second processor determines the content of the operation instruction based on the optical signal with the largest evaluation value.

[0021] It is preferable that the second processor controls the storage of historical information of the optical receiver that received the optical signal used to determine the content of the operation instruction in a memory unit, and identifies the optical signal for determining the content of the operation instruction based on the historical information in addition to the evaluation value.

[0022] It is preferable that the device further includes a third processor, which accepts a selection instruction from a user and identifies an optical signal for determining the content of the operation instruction based on the selection instruction.

[0023] The disclosed method for operating a projection device includes a projection lens unit including an optical system that projects image light onto a projection surface, and first and second optical receivers that are provided in the projection lens unit and receive optical signals emitted from a remote controller, wherein the first optical receiver is positioned at a position where it can receive an optical signal that has passed through at least a portion of the optical system, and the second optical receiver is positioned at a position where it can receive an optical signal without passing through the optical system, and the method includes deriving an evaluation value regarding the quality of the optical signal received by the first and second optical receivers, and identifying an optical signal for determining the content of an operation instruction based on the evaluation value.

[0024] 1 is a diagram showing a projector; FIG. 2 is a diagram showing a connection portion between a projection lens unit and a main body unit; FIG. 3 is a diagram showing a detailed configuration of a projector; FIG. 4 is a diagram showing a light receiving unit arranged in a light receiving window; FIG. 5 is an exploded perspective view of the light receiving unit; FIG. 6 is a cross-sectional view of the projection lens unit; FIG. 7 is an enlarged cross-sectional view of the vicinity of a third barrel unit of the projection lens unit; FIG. 8 is an enlarged cross-sectional view of the vicinity of a first surface of the holding frame; FIG. 9 is a diagram showing the arrangement position of the light receiving unit in the projection lens unit; FIG. 10 is an exploded perspective view of an output lens, a holding frame, a light receiving unit, etc.; FIG. 11 is an exploded perspective view of an output lens, a holding frame, a light receiving unit, etc.; FIG. 12 is an enlarged perspective view of the vicinity of the first surface of the holding frame; FIG. 13 is a perspective view showing the reduction side surface of the output lens; FIG. 14 is an enlarged cross-sectional view of the vicinity of a second mirror; FIG. 15 is a diagram showing the positional relationship between the second mirror and the light receiving unit; FIG. 16 is a simplified diagram showing the arrangement of a light receiver; FIG. 17 is a block diagram of a projector; FIG. 18 is a block diagram of a control unit; FIG. 19 is a block diagram of a CPU; FIG. 20 is a diagram showing the processing of a derivation unit; FIG. 21 is a diagram showing condition A; FIG. 22 is a diagram showing condition B; FIG. 23 is a diagram showing condition C; FIG. 24 is a diagram showing the processing of a determination unit; FIG. 25 is a diagram showing the processing of a determination unit; 10 is a diagram showing the processing of a determination unit. FIG. 10 is a diagram showing the processing of a determination unit. FIG. 10 is a diagram showing a usage state of a projector. FIG. 10 is a diagram showing the usage state of a projector. FIG. 10 is a diagram showing the processing of a determination unit. FIG. 10 is a diagram showing a usage state of a projector. FIG. 10 is a flowchart showing the processing procedure of a CPU. FIG. 10 is a flowchart showing the processing procedure of a CPU. FIG. 10 is a flowchart showing the processing procedure of a CPU. FIG. 10 is a diagram showing a modified example of the processing of the determination unit. FIG. 10 is a block diagram of a CPU of a second embodiment. FIG. 10 is a flowchart showing the processing procedure of a CPU of a second embodiment. FIG. 10 is a diagram showing a photoreceiver to be used selection screen and an instruction receiving unit.

[0025] An example of an embodiment of the technology of the present disclosure will be described below with reference to the drawings. Note that the terms "first," "second," and "third" used in this specification are used to avoid confusion between components, and do not limit the number of components present in the projection device.

[0026] 1, a projector 10 includes a projection lens unit 11 and a main body unit 12. The projector 10 is an example of a "projection device" according to the technology of the present disclosure.

[0027] The projector 10 is also provided with a remote controller 13 as an accessory. The remote controller 13 has various operation buttons such as a power button, a brightness adjustment button, a sharpness adjustment button, a volume adjustment button, a menu display button, a menu selection button, a zoom operation button, and a focus operation button.

[0028] One end of the projection lens unit 11 is attached to the main body unit 12. The main body unit 12 houses main components such as the image forming unit 14 and a control board. The image forming unit 14 forms image light to be projected onto the projection surface through the projection lens unit 11. The image forming unit 14 includes an image forming panel 15, a light source 16, and a light guide member (not shown). The light source 16 irradiates light onto the image forming panel 15. The light guide member guides the light from the light source 16 to the image forming panel 15.

[0029] Image forming unit 14 is, for example, a reflective type that uses a DMD (Digital Micromirror Device: registered trademark) as image forming panel 15. As is well known, a DMD is an image display element that has a plurality of micromirrors that can change the reflection direction of light emitted from light source 16, and the micromirrors are arranged two-dimensionally in pixel units. The DMD performs light modulation according to the image by changing the orientation of each micromirror according to the image, thereby switching on and off the reflected light from light source 16.

[0030] An example of the light source 16 is a white light source. The white light source emits white light. The white light source can be realized, for example, by combining a laser light source and a phosphor. The laser light source is a blue laser light source that emits blue light as excitation light to the phosphor. The phosphor is a yellow phosphor that emits yellow light when excited by the blue light emitted from the laser light source. The white light source emits white light by combining the blue light emitted from the blue laser light source and the yellow light emitted from the yellow phosphor. The image forming unit 14 further includes a rotary color filter that selectively converts the white light emitted by the light source 16 into blue, green, and red light in a time-division manner. The blue, green, and red light are selectively irradiated onto the image forming panel 15, thereby obtaining image light carrying image information for each of the blue, green, and red colors. The image light thus obtained is selectively incident on the projection lens unit 11 and projected toward the projection surface. The image lights of each color are integrated on the projection surface, so that a full-color image P (see FIG. 32, etc.) is displayed on the projection surface.

[0031] A light beam representing an image formed by the image forming unit 14 is incident on the projection lens unit 11 from the main body 12. The projection lens unit 11 enlarges and forms an image based on the incident light beam. As a result, the projection lens unit 11 projects an image P, which is an enlarged image of the image formed by the image forming unit 14, onto the projection surface from the outermost output lens L35.

[0032] The remote controller 13 is an operating member for remotely operating the projector 10 and is battery-powered. As described above, the remote controller 13 has a plurality of operation buttons for issuing operation instructions, such as a power button, a zoom operation button, and a focus operation button. The remote controller 13 emits an optical signal OS (see FIG. 8, etc.), such as infrared light, in response to a user U (see FIG. 35) pressing an operation button. Note that the optical signal OS is not limited to infrared light. Visible light may also be used. Furthermore, the remote controller 13 is not limited to the one originally installed in the projector 10. It may be a commercially available general-purpose remote controller from another manufacturer, or a personal mobile information terminal such as a smartphone that has the functionality of the remote controller 13.

[0033] As an example, as shown in FIG. 2 , the projection lens unit 11 includes a connection portion 17. The connection portion 17 is a so-called mount portion and has multiple electrodes (not shown). The main body unit 12 is provided with a connection portion 18 corresponding to the connection portion 17. The connection portion 18 is also a so-called mount portion and has multiple electrodes (not shown). By connecting the connection portion 17 to the connection portion 18 of the main body unit 12, the projection lens unit 11 is mechanically and electrically connected to the main body unit 12 (via the electrodes of the connection portion 17 and the connection portion 18). At this time, the end of the connection portion 17 enters the main body unit 12 (see FIG. 6 ). Note that the projection lens unit 11 extends up to the portion that holds the lens L11 (see FIG. 6 ), onto which the light beam representing the image formed by the image forming unit 14 first enters.

[0034] The projection lens unit 11 can be attached to and detached from the main body unit 12 by the connecting portion 17. Specifically, a protrusion (not shown) formed on the connecting portion 18 on the projector 10 side is engaged with a groove (not shown) formed on the connecting portion 17 on the projection lens unit 11 side, and the projection lens unit 11 is rotated clockwise in the circumferential direction, thereby fixing the connecting portion 17 to the connecting portion 18. Furthermore, with the connecting portion 17 and the connecting portion 18 fixed, the connecting portion 17 can be removed from the connecting portion 18 by rotating the projection lens unit 11 counterclockwise in the circumferential direction.

[0035] 3, an operation unit 21 is provided on the top surface 20 of the main body 12. Like the remote controller 13, the operation unit 21 has various operation buttons such as a power button, a brightness adjustment button, a sharpness adjustment button, a volume adjustment button, a menu display button, a menu selection button, a zoom operation button, and a focus operation button.

[0036] A light-receiving window 23A for receiving the optical signal OS emitted from the remote controller 13 is provided in the upper center of the front surface 22 of the tip of the projection lens unit 11, where the output lens L35 is disposed. A light-receiving window 23B for the optical signal OS is also provided in the upper center of the back surface 24 of the tip of the projection lens unit 11, which faces the front surface 22. Furthermore, light-receiving windows 23C, 23D, and 23E for the optical signal OS are also provided in the upper center of the back surface 26 of the main body unit 12, which faces the front surface 25 to which the projection lens unit 11 is attached, and in the upper centers of two opposing side surfaces 27 and 28 of the main body unit 12 that connect the front surface 25 and the back surface 26. In the following description, the light-receiving windows 23A to 23E will be referred to as light-receiving windows 23 unless a distinction is particularly needed.

[0037] As shown in Fig. 4 as an example, a light receiving unit 30 is disposed within the light receiving window 23. As also shown in Fig. 5 as an example, the light receiving unit 30 includes a light receiver 31 and a circuit board 32. The light receiver 31 has a cylindrical shape with a rounded tip, and receives the optical signal OS from the remote controller 13 that passes through the light receiving window 23 using a light receiving element built into the tip. The tip of the light receiver 31, which incorporates a light receiving element for the optical signal OS, is directed toward the light receiving window 23. The light receiver 31 is capable of receiving the optical signal OS at an incident angle corresponding to a predetermined directivity angle.

[0038] The circuit board 32 has a rectangular plate shape and is equipped with various electric circuits 33, such as a control circuit that controls the operation of the optical receiver 31. A connector 34 that connects to the optical receiver 31 is provided in the center of the circuit board 32. The electric circuit 33 converts the optical signal OS received by the optical receiver 31 into an electric signal ES (see FIG. 19 ). Although not shown, wiring is connected to the circuit board 32 for transmitting the electric signal ES converted from the optical signal OS by the electric circuit 33 to the control unit 90 (see FIG. 17 ) in the main body 12.

[0039] In the following description, the light receiver 31 of the light receiving unit 30 arranged in the light receiving window 23A will be referred to as light receiver 31A or light receiver A, the light receiver 31 of the light receiving unit 30 arranged in the light receiving window 23B will be referred to as light receiver 31B or light receiver B. Furthermore, the light receiver 31 of the light receiving unit 30 arranged in the light receiving window 23C will be referred to as light receiver 31C or light receiver C, the light receiver 31 of the light receiving unit 30 arranged in the light receiving window 23D will be referred to as light receiver 31D or light receiver D, and the light receiver 31 of the light receiving unit 30 arranged in the light receiving window 23E will be referred to as light receiver 31E or light receiver E.

[0040] The photoreceivers 31A and 31B are provided in the projection lens unit 11 and are positioned so that they can receive the optical signal OS without passing through the bending optical system BOP (see FIG. 6). That is, the photoreceivers 31A and 31B are an example of a "second photoreceiver" according to the technology of the present disclosure. The photoreceivers 31C to 31E are provided in the main body unit 12. That is, the photoreceivers 31C to 31E are an example of a "third photoreceiver" according to the technology of the present disclosure. In this way, the two photoreceivers, 31A and 31B, are provided as second photoreceivers. Furthermore, the three photoreceivers, 31C to 31E, are provided as third photoreceivers.

[0041] As an example, as shown in FIG. 6 , the projection lens unit 11 includes a bending optical system BOP. The bending optical system BOP is an example of an "optical system" according to the technology of the present disclosure. The bending optical system BOP has a first optical axis A1, a second optical axis A2, and a third optical axis A3. The first optical axis A1 is an optical axis through which light from the main body unit 12 passes. The second optical axis A2 is an optical axis bent by 90° with respect to the first optical axis A1. The third optical axis A3 is an optical axis bent by 90° with respect to the second optical axis A2. Therefore, the first optical axis A1 and the third optical axis A3 are parallel. Here, "90°" refers to not only a perfect 90°, but also a 90° that includes an error that is generally acceptable in the technical field to which the technology of the present disclosure belongs and that does not contradict the spirit of the technology of the present disclosure. Furthermore, "parallel" refers not only to perfect parallelism but also to parallelism that includes an error that is generally acceptable in the technical field to which the technology of the present disclosure belongs and that does not contradict the spirit of the technology of the present disclosure. Note that Fig. 6 shows the projection lens unit 11 with the exterior cover removed.

[0042] In the following description, the direction parallel to the first optical axis A1 and the third optical axis A3 is referred to as the Y direction, the direction parallel to the second optical axis A2 is referred to as the Z direction, and the direction perpendicular to the Y direction and the Z direction is referred to as the X direction. In addition, the side of the projection surface (the side of the output lens L35) is referred to as the enlargement side, and the side opposite the projection surface (the side of the lens L11) is referred to as the reduction side.

[0043] The projection lens unit 11 has a first lens barrel unit 40, a second lens barrel unit 41, and a third lens barrel unit 42. The first lens barrel unit 40 is located on the reduction side (the side farthest from the projection surface), and the third lens barrel unit 42 is located on the enlargement side (the side closest to the projection surface). The second lens barrel unit 41 is located between the first lens barrel unit 40 and the third lens barrel unit 42. Each lens barrel unit 40 to 42 holds a lens. The lens held by the first lens barrel unit 40 is arranged on a first optical axis A1, the lens held by the second lens barrel unit 41 is arranged on a second optical axis A2, and the lens held by the third lens barrel unit 42 is arranged on a third optical axis A3. The central axis of the first lens barrel 40 substantially coincides with the first optical axis A1, the central axis of the second lens barrel 41 substantially coincides with the second optical axis A2, and the central axis of the third lens barrel 42 substantially coincides with the third optical axis A3. Note that, in this specification, for the sake of simplicity, multiple lenses may be omitted and expressed as if they were a single lens.

[0044] The first lens barrel 40 holds a first optical system OP1. The first optical system OP1 is composed of, for example, lenses L11, L12, L13, L14, L15, and L16, and is arranged along a first optical axis A1. The first optical system OP1 forms an intermediate image MI of the image light from the main body 12. The intermediate image MI is formed on the reduction side of the second optical system OP2, for example, on the reduction side of a first mirror 48 described below. In other words, the intermediate image MI is formed at a position between the lens L16 and the first mirror 48. A fixed aperture 43 is provided between the lenses L13 and L14. The fixed aperture 43 narrows the light beam incident from the main body 12.

[0045] Lenses L11, L12, and L13 are held by a holding frame 44. Lenses L11 and L12 constitute, for example, a zoom lens ZL (see FIG. 17). Lens L14 is held by a holding frame 45. Lens L15 is held by a holding frame 46. Lens L16 is held by a holding frame 47. The holding frame 47 holds the holding frame 46. The holding frame 46 is an inner frame, and the holding frame 47 is an outer frame.

[0046] The lens L15 is a lens that primarily functions to correct aberrations such as field curvature aberration. For this reason, an aspherical lens that includes an aspherical surface on the lens surface, which is advantageous for aberration correction, is used for the lens L15. Since aspherical lenses can be manufactured more easily using resin than glass, the lens L15 is formed from a resin such as a cycloolefin polymer. Meanwhile, in this example, all of the lenses that make up the first optical system OP1 other than the lens L15 are formed from glass. Here, the lens surface refers to the surface through which image light passes through the lens. The lens L15 may also be formed from glass.

[0047] The second lens barrel 41 holds the second optical system OP2. The second optical system OP2 is composed of, for example, lenses L21 and L22 and is arranged along the second optical axis A2. The lenses L21 and L22 are made of glass. In this example, the second optical system OP2 functions as a relay lens. More specifically, the second optical system OP2 uses the intermediate image MI formed by the first optical system OP1 as a subject and relays a light beam representing the intermediate image MI to the third lens barrel 42.

[0048] The second barrel 41 integrally holds a first mirror 48 and a second mirror 49. The first mirror 48 and the second mirror 49 are each one of the optical elements that make up the bending optical system BOP, and bend the optical axis. The first mirror 48 bends light along the first optical axis A1 to form light along the second optical axis A2. The second mirror 49 bends light along the second optical axis A2 to form light along the third optical axis A3.

[0049] The first mirror 48 is held in a position where its reflective surface forms an angle of 45° with respect to each of the first optical axis A1 and the second optical axis A2. Similarly, the second mirror 49 is held in a position where its reflective surface forms an angle of 45° with respect to each of the second optical axis A2 and the third optical axis A3. The first mirror 48 and the second mirror 49 are specular reflection mirrors made of a transparent material such as glass coated with a reflective film. Note that the first mirror 48 and the second mirror 49 may also be mirrors that use prisms that totally reflect light.

[0050] The third barrel 42 holds the third optical system OP3. The third optical system OP3 is composed of a lens L31, a lens L32, a lens L33, a lens L34, and an output lens L35, and is arranged along the third optical axis A3.

[0051] Lenses L31 and L32 are held by a holding frame 50. Lenses L31 and L32 constitute, for example, a focus lens FL (see FIG. 17). Lenses L33 and L34 are held by a holding frame 51. Output lens L35 is held by holding frames 51 and 52. Holding frame 52 holds holding frame 51. Holding frame 51 is an inner frame, and holding frame 52 is an outer frame.

[0052] Lenses L33 and L34 have negative refractive power to enlarge the projected image P and diverge the image light. Exit lens L35 is the lens located on the most enlargement side and emits the image light toward the projection surface. Exit lens L35 is an aspherical lens like lens L15 and is made of a resin such as cycloolefin polymer. In contrast, lenses L33 and L34, located on the reduction side of exit lens L35, are spherical lenses with spherical lens surfaces and are made of glass. Lenses L31 and L32 are also spherical lenses with spherical lens surfaces and are made of glass.

[0053] The half angle of view of the projection lens unit 11 is, for example, 63° or more, more preferably 65° or more. To ensure such a wide half angle of view, lenses L33 and L34 require high refractive power. To ensure high refractive power, glass lenses are preferable to plastic lenses. However, when glass lenses are used, increasing the diameter of the lens surface increases the weight, so a small diameter is preferable. Therefore, lenses L33 and L34 are formed of glass to ensure high refractive power while preventing the diameter of the lens surface from increasing. This allows the angle of view of the projected image P to be widened while maintaining a relatively small diameter of the lens surface.

[0054] On the other hand, the output lens L35 in the third optical system OP3 primarily functions to correct aberrations. As mentioned above, lenses L33 and L34 have high refractive power to achieve a wide angle while maintaining a small diameter. Generally, the higher the refractive power, the greater the field curvature and distortion aberrations. Aspherical lenses have better aberration correction capabilities than spherical lenses. For this reason, an aspherical lens is used for the output lens L35, which is combined with lenses having high refractive power such as lenses L33 and L34. Furthermore, since the output lens L35 is positioned closest to the magnification side, it has the largest lens surface radius of all the lenses in the projection lens unit 11 and is an aspherical lens. Such large-diameter aspherical lenses are extremely difficult to manufacture using glass. Therefore, the output lens L35 is made of resin.

[0055] As shown in FIG. 7 as an example, the holding frame 51 has a first surface 60, a second surface 61, a third surface 62, and an intermediate surface 63. These surfaces 60-63 all extend radially and are parallel to the XZ plane. The first surface 60 is located at the outermost radial position of the holding frame 51 among these surfaces 60-63 and has an annular sector shape (see FIG. 11). The first surface 60 faces the end RSE_L35 of the reduction-side surface RS_L35 of the output lens L35. The second surface 61 and the third surface 62 have an annular shape (see FIG. 11). The second surface 61 is recessed from the first surface 60 and the intermediate surface 63 toward the reduction side. The third surface 62 is recessed further from the second surface 61 toward the reduction side. The lens L34 is held in the step portion between the first surface 60 and the intermediate surface 63 and the second surface 61. Furthermore, the lens L33 is held in a step portion formed between the second surface 61 and the third surface 62. The second surface 61 faces an end RSE_L34 of the reduction-side surface RS_L34 of the lens L34. The third surface 62 faces an end RSE_L33 of the reduction-side surface RS_L33 of the lens L33.

[0056] The intermediate surface 63 has an annular shape (see FIG. 11 ) and connects the first surface 60 and the second surface 61. A plurality of grooves with a V-shaped cross section are formed in the intermediate surface 63. These grooves allow the intermediate surface 63 to function as a light scattering surface that suppresses the generation of stray light, which becomes noise in the image P. The stray light is caused by returning light that travels toward the reduction side due to Fresnel reflection on the lens surface of the output lens L35. This returning light is scattered by the light scattering surface, preventing it from concentrating locally. Therefore, the generation of stray light can be suppressed.

[0057] As an example, as shown in Figure 8, the light receiving unit 30 is attached to the first surface 60. The light receiving unit 31 has a tip end, which incorporates a light receiving element for the optical signal OS, located on the first surface 60 side. In contrast, the circuit board 32 is located on the surface opposite the first surface 60, on the back surface 65 of the holding frame 51 facing the reduction side. Note that Figure 8 illustrates the light receiving unit 31 receiving the optical signal OS parallel to the Y direction, but in reality, the light receiving unit 31 can receive the optical signal OS at an incident angle corresponding to a predetermined directivity angle. The same applies to Figure 14 below.

[0058] As an example, as shown in FIG. 9 , a total of four light receiving units 30 are provided on the first surface 60. The light receiving units 30 are arranged symmetrically with respect to the third optical axis A3 so that the probability of the light receiving device 31 of each light receiving unit 30 receiving the optical signal OS is equal. Specifically, the light receiving units 30 are arranged at positions approximately ±45° with respect to a line parallel to the Z direction passing through the third optical axis A3, and at positions approximately ±100° with respect to a line parallel to the Z direction passing through the third optical axis A3. In the following description, the light receiving device 31 of the light receiving unit 30 arranged at approximately +45° (upper right) will be referred to as light receiving device 31F or light receiving device F, and the light receiving device 31 of the light receiving unit 30 arranged at approximately −45° (upper left) will be referred to as light receiving device 31G or light receiving device G. In addition, the photodetector 31 of the photodetector unit 30 positioned at approximately +100° (bottom right) will be referred to as photodetector 31H or photodetector H, and the photodetector 31 of the photodetector unit 30 positioned at approximately -100° (bottom left) will be referred to as photodetector 31I or photodetector I.

[0059] The photoreceivers 31F to 31I are provided in the projection lens unit 11 and are arranged in positions where they can receive the optical signal OS that has passed through at least a part of the bending optical system BOP, in this case, the output lens L35. In other words, the photoreceivers 31F to 31I are an example of a "first photoreceiver" according to the technology of the present disclosure. Note that, in the following Figures 10 to 13, to avoid complexity, only the photoreceiver unit 30 having the photoreceiver 31F is illustrated.

[0060] 10 and 11 , as an example, four screw insertion holes 71, through which four screws 70 are inserted, are formed in the holding frame 52. Four screw holes 72 are formed in the surface of the holding frame 51 facing the holding frame 52, at positions facing the screw insertion holes 71. The screws 70 are inserted into the screw insertion holes 71 and screwed into the screw holes 72, thereby fastening and fixing the holding frame 52 to the holding frame 51.

[0061] As an example, as shown in an enlarged view in Fig. 12, a through-hole 73 is formed in the holding frame 51, penetrating the first surface 60 and the back surface 65. The through-hole 73 has a diameter slightly larger than that of the optical receiver 31. The optical receiver 31 is inserted into the through-hole 73. The optical receiver 31 is fixed to the through-hole 73 with an adhesive or the like.

[0062] 13, an end RSE_L35 of the surface RS_L35 on the reduction side of the output lens L35 has a plurality of circular recesses 80. The recesses 80 are formed by ejector pins used when the resin output lens L35 is extruded from the mold. In order to equalize the force applied to the output lens L35 when it is extruded from the mold, the recesses 80 are provided at positions symmetrical with respect to the third optical axis A3. The tip of the photodetector 31 is disposed within the recess 80 at a position corresponding to the through-hole 73 (see also FIG. 9).

[0063] The end RSE_L35 is provided with a plurality of oval seating surfaces 81. The seating surfaces 81 abut against the first surface 60. In addition, a plurality of fitting protrusions 82 that protrude slightly in the radial direction are provided on the edge of the output lens L35. The fitting protrusions 82 fit into fitting grooves (not shown) provided in the holding frame 51. The seating surfaces 81 and the fitting protrusions 82 position the output lens L35 relative to the holding frame 51. Note that the end RSE_L35 does not need to have the recess 80. In that case, the light receiver 31 can be positioned by, for example, adjusting the height of the seating surfaces 81 to form a gap between the output lens L35 and the first surface 60 that is large enough for the light receiver 31.

[0064] 14 and 15 , as an example, a light-receiving unit 30 is also attached to a rear surface 86 of the second mirror 49, opposite the reflective surface 85. More specifically, a through-hole 88 is formed in a cover 87 that covers the rear surface 86 of the second mirror 49. The through-hole 88 is formed in a position of the cover 87 corresponding to the center of the second mirror 49. The through-hole 88 has a diameter slightly larger than that of the light-receiving device 31. The light-receiving device 31 is inserted into the through-hole 88. The light-receiving device 31 is fixed to the through-hole 88 with an adhesive or the like. The light-receiving device 31 has a tip end that incorporates a light-receiving element for the optical signal OS disposed on the rear surface 86 side (inside the cover 87), and the circuit board 32 is disposed on the outside of the cover 87.

[0065] The second mirror 49 is made of a material that transmits the optical signal OS. If the optical signal OS is, for example, infrared light, the second mirror 49 is a so-called cold mirror that has an optical thin film that reflects visible light and transmits infrared light. Therefore, the optical signal OS that passes through the output lens L35 passes through lenses L34, L33, L32, and L31 and further through the second mirror 49, and is received by the optical receiver 31 attached in a position facing the back surface 86 of the second mirror 49. In the following description, the optical receiver 31 of the optical receiving unit 30 that is positioned facing the back surface 86 of the second mirror 49 will be referred to as optical receiver 31J or optical receiver J.

[0066] The photoreceiver 31J is provided in the projection lens unit 11 and is disposed in a position where it can receive the optical signal OS that has passed through at least a part of the bending optical system BOP, in this case, the output lens L35, lenses L34, L33, L32, and L31, and the second mirror 49. In other words, the photoreceiver 31J, like the photoreceivers 31F to 31I, is an example of a "first photoreceiver" according to the technology of the present disclosure. In this way, five photoreceivers, 31F to 31J, are provided as first photoreceivers.

[0067] The above can be summarized as an example, as shown in the simplified form in Figure 16. That is, the projector 10 includes, as photoreceivers 31 that receive the optical signal OS, photoreceivers 31F to 31J, which are first photoreceivers provided in the projection lens unit 11 and positioned so as to be able to receive the optical signal OS that has passed through at least a portion of the bending optical system BOP. The projector 10 also includes photoreceivers 31A and 31B, which are second photoreceivers provided in the projection lens unit 11 and positioned so as to be able to receive the optical signal OS without passing through the bending optical system BOP. The projector 10 also includes photoreceivers 31C to 31E, which are third photoreceivers provided in the main body unit 12.

[0068] 17 , the projector 10 includes a control unit 90. The control unit 90 is provided in the main body 12. The control unit 90 is connected to the operation unit 21, the light receiving unit 30, a zoom lens driving mechanism 91, and a focus lens driving mechanism 92.

[0069] The zoom lens drive mechanism 91 and the focus lens drive mechanism 92 are provided within the projection lens unit 11. The zoom lens drive mechanism 91 includes a zoom motor that moves the zoom lens ZL along the first optical axis A1, a zoom motor driver, etc. The focus lens drive mechanism 92 similarly includes a focus motor that moves the focus lens FL along the third optical axis A3, and a focus motor driver, etc. The motors, drivers, and other electrical components of the drive mechanisms 91 and 92 are driven under the control of the control unit 90. More specifically, the control unit 90 issues drive signals DS (see FIG. 19 ) in response to operation instructions from the user U input via the remote controller 13 or the operation unit 21 to drive the electrical components of the drive mechanisms 91 and 92. For example, when an operation instruction to change the angle of view toward the telephoto end is input via the zoom operation switch of the remote controller 13 or the operation unit 21, the control unit 90 issues a drive signal DS to the driver of the zoom motor of the zoom lens drive mechanism 91 to move the zoom lens ZL toward the telephoto end.

[0070] The control unit 90 is connected to various units, such as an external communication I / F (Interface) 93, an image processing unit 94, an audio processing unit 95, a panel driver 96, and a light source driver 97, via a bus line 98. These units are provided together with the control unit 90 within the main body 12.

[0071] The external communication I / F 93 communicates with an external device 99 via a connection terminal such as a USB (Universal Serial Bus) terminal. The external device 99 is an image output device such as a personal computer, a Blu-ray Disc player, or a hard disk recorder. The external communication I / F 93 captures images from the external device 99. If the images from the external device 99 are moving images accompanied by audio, the external communication I / F 93 also captures the audio in addition to the images.

[0072] The image processing unit 94 converts the image captured by the external communication I / F 93 into image data in a predetermined format suitable for projection. The audio processing unit 95 converts the audio captured by the external communication I / F 93 into analog audio data and outputs the audio through the speaker 100. The speaker 100 is provided, for example, on the front surface 25 of the main body 12. Note that the speaker 100 may be separate from the main body 12 and connected to the main body 12 by wiring.

[0073] The panel driver 96, under the control of the control unit 90, drives the image forming panel 15 to project the image data that has been image-processed by the image processing unit 94 as the image P. The light source driver 97, under the control of the control unit 90, drives the light source 16.

[0074] 18, the control unit 90 includes a storage 105, a CPU (Central Processing Unit) 106, and a memory 107. The storage 105, the CPU 106, and the memory 107 are interconnected via a bus line 108.

[0075] The storage 105 is a storage device such as a hard disk drive or a solid state drive. The storage 105 stores various programs and various data associated with the programs. The storage 105 is an example of a "storage unit" according to the technology of the present disclosure.

[0076] The memory 107 is a work memory for the CPU 106 to execute processing. The CPU 106 loads a program stored in the storage 105 into the memory 107 and executes processing according to the program. In this way, the CPU 106 comprehensively controls each unit of the projector 10. The CPU 106 is an example of a "first processor," a "second processor," and a "third processor" according to the technology of the present disclosure. Note that the memory 107 may be built into the CPU 106.

[0077] As an example, as shown in Figure 19, an operating program 110 is stored in the storage 105. The operating program 110 is a program for causing the CPU 106 to execute various controls. In addition to the operating program 110, the storage 105 also stores a condition group 111. The condition group 111 includes a condition 112A, a condition 112B, and a condition 112C. In the following description, the condition 112A may be referred to as condition A, the condition 112B as condition B, and the condition 112C as condition C.

[0078] When the operating program 110 is started, the CPU 106, in cooperation with the memory 107 and the like, functions as a derivation unit 120, a determination unit 121, an instruction receiving unit 122, and a drive signal generation unit 123. In addition to these processing units, the CPU 106 also functions as a panel drive control unit that controls the drive of the image forming panel 15 via a panel driver 96, a light source drive control unit that controls the drive of the light source 16 via a light source driver 97, and the like.

[0079] The derivation unit 120 receives the electrical signal ES from the light-receiving unit 30. The derivation unit 120 derives an evaluation value 125 related to the quality of the electrical signal ES. The electrical signal ES is a signal obtained by converting the optical signal OS received by the optical receiver 31 in the electrical circuit 33. Therefore, it can be said that the derivation unit 120 derives the evaluation value 125 related to the quality of the optical signal OS by deriving the evaluation value 125 related to the quality of the electrical signal ES. The derivation unit 120 outputs the evaluation value 125 to the determination unit 121.

[0080] The determination unit 121 identifies an optical signal OS for determining the content of the operation instruction based on the condition group 111 and the evaluation value 125. The determination unit 121 determines the content of the operation instruction from the identified optical signal OS. The determination unit 121 outputs a determination result 126 of the content of the operation instruction to the drive signal generation unit 123. The determination result 126 includes the determined content of the operation instruction and information about the optical receiver 31 that received the optical signal OS used to determine the content of the operation instruction (see FIG. 24 , etc.).

[0081] The instruction receiving unit 122 receives various operation instructions from the operation unit 21. The drive signal generating unit 123 generates a drive signal DS in accordance with the operation instructions received by the instruction receiving unit 122 from the operation unit 21 and the determination result 126 from the determination unit 121. The drive signal generating unit 123 outputs the drive signal DS to a predetermined receiver for each drive signal DS. For example, if the drive signal DS is related to the zoom lens ZL, the drive signal generating unit 123 outputs the drive signal DS to the zoom lens driving mechanism 91 as the receiver.

[0082] As an example, as shown in FIG. 20 , the derivation unit 120 receives the electrical signals ES from all of the optical receivers 31A to 31J that received the optical signal OS. The derivation unit 120 derives an evaluation value 125 for each electrical signal ES. The derivation unit 120 derives the evaluation value 125 as a numerical value between 0 and 100 (0 being the lowest and 100 being the highest) that comprehensively takes into account the quality of the electrical signal ES, such as the level of a high signal representing "1" in the electrical signal ES, the level difference between the high signal and the low signal representing "0," the waveform shape of the high signal (sharpness of the square wave), and the S / N ratio. As shown in the example of optical receiver 31J, the derivation unit 120 sets the evaluation value 125 to the lowest value of "0" for the optical receiver 31 that did not receive the optical signal OS. The evaluation value 125 may be derived using a machine learning model that outputs the evaluation value 125 in response to the input of the electrical signal ES.

[0083] As an example, as shown in FIGS. 21 to 23 , conditions 112A to 112C all have thresholds set for the evaluation value 125. That is, condition 112A requires that the evaluation value 125 be 75 or greater. Condition 112B requires that the evaluation value 125 be 50 or greater. Condition 112C requires that the evaluation value 125 be 63 or greater. Condition 112A is the strictest condition. Condition 112B is less stringent than condition 112A. Condition 112C is less stringent than condition 112A but more stringent than condition 112B. Note that condition 112C may be the same as condition 112A. Condition 112A is an example of the "first condition" and "fourth condition" according to the technology of the present disclosure. Condition 112B is an example of the "second condition" and "fifth condition" according to the technology of the present disclosure. Condition 112C is an example of the "third condition" and "sixth condition" according to the technique of the present disclosure.

[0084] The determination unit 121 determines the content of the operational instruction based on the optical signal OS whose evaluation value 125 satisfies the condition 112A among the optical signals OS received by the optical receivers 31A to 31E (second and third optical receivers). For example, if there is only one optical signal OS whose evaluation value 125 satisfies the condition 112A among the optical signals OS received by the optical receivers 31A to 31E, the determination unit 121 identifies that one optical signal OS as the optical signal OS for determining the content of the operational instruction. Then, the determination unit 121 determines the content of the operational instruction based on the identified optical signal OS.

[0085] 24, when there are a plurality of optical signals OS whose evaluation values ​​125 satisfy the condition 112A among the optical signals OS received by the optical receivers 31A to 31E, the determination unit 121 identifies the optical signal OS with the largest evaluation value 125 as the optical signal OS for determining the content of the operation instruction, as indicated by hatching.Then, the determination unit 121 determines the content of the operation instruction based on the identified optical signal OS.

[0086] 24 illustrates a case where the optical signal OS is received by all of the optical receivers 31A to 31E. The example also illustrates a case where the evaluation value of the optical signal OS received by the optical receiver 31A is the maximum of "98" and the content of the operation instruction is "S10." In this case, the determination unit 121 identifies the optical signal OS received by the optical receiver 31A as the optical signal OS for determining the content of the operation instruction, and determines the content of the operation instruction to be "S10."

[0087] The reason why the optical signal OS was not identified as the optical signal OS for determining the content of the operation instruction is shown to the right of the table below the first arrow. The same applies to the following Figures 25, 29, 30, 34, etc. The "x1" for optical receiver 31G, etc. is because the optical signal OS was not received in the first place. The "x2" for optical receiver 31F, etc. is because the optical receiver is not one of optical receivers 31A to 31E. The "x3" for optical receiver 31D is because the evaluation value 125 does not satisfy condition 112A. The "x4" for optical receiver 31B, etc. is because the evaluation value 125 satisfies condition 112A but is not the maximum.

[0088] As an example, as shown in Figure 25, if there are multiple optical signals OS received by optical receivers 31A to 31E whose evaluation values ​​125 do not satisfy condition 112A but do satisfy condition 112B, the judgment unit 121 identifies the multiple optical signals OS that satisfy condition 112B as optical signals OS for judging the content of the operation instruction, as shown by hatching.

[0089] 25 illustrates a case where the optical signal OS is received by all of the optical receivers 31A to 31E. Also illustrated is a case where the evaluation values ​​125 of the optical signals OS received by the optical receivers 31B to 31E do not satisfy the condition 112A but do satisfy the condition 112B. In this case, the determination unit 121 identifies the optical signals OS received by the optical receivers 31B to 31E as the optical signals OS for determining the content of the operation instruction. The "x5" for the optical receiver 31A is because the evaluation value 125 does not satisfy the condition 112B either.

[0090] As an example, as shown in FIG. 26 , the determination unit 121 selects the operation instruction content with the highest occurrence frequency from among the operation instruction contents of the multiple optical signals OS identified as shown in FIG. 25 . FIG. 26 illustrates a case where only the operation instruction content of the optical signal OS received by the optical receiver 31D is "S16," while the others are "S15." In this case, the determination unit 121 determines the operation instruction content as "S15." Note that, as in the example of FIG. 26 , when multiple optical receivers 31 receive the optical signal OS used to determine the operation instruction content (three optical receivers, namely, optical receivers 31B, 31C, and 31E in FIG. 26 ), the optical receiver 31 that received the optical signal OS with the highest evaluation value 125 (optical receiver 31C in FIG. 26 ) is registered as the representative in the determination result 126.

[0091] As an example, as shown in FIG. 27 , when the occurrence frequency is the same for two or more types of operation instructions, the determination unit 121 adopts the operation instruction with the highest average value of the evaluation value 125. FIG. 27 illustrates a case where the operation instruction for the optical signal OS received by the optical receivers 31A and 31C is "S20," and the operation instruction for the optical signal OS received by the optical receivers 31D and 31E is "S21." FIG. 27 also illustrates a case where the average value of the evaluation value 125 for the optical signal OS received by the optical receivers 31A and 31C is "72," and the average value of the evaluation value 125 for the optical signal OS received by the optical receivers 31D and 31E is "57." In this case, the determination unit 121 determines the operation instruction to be "S20."

[0092] As an example, as shown in FIG. 28 , if there are two optical signals OS whose evaluation values ​​125 satisfy the condition 112B and the operation instructions for the two optical signals OS are different, the determination unit 121 adopts the operation instruction with the higher evaluation value 125. FIG. 28 illustrates a case where the optical signals OS whose evaluation values ​​125 satisfy the condition 112B are the optical signals OS received by the optical receiver 31A and the optical receiver 31D. FIG. 28 also illustrates a case where the operation instruction for the optical signal OS received by the optical receiver 31A is "S20" and the operation instruction for the optical signal OS received by the optical receiver 31D is "S21." Furthermore, FIG. 28 illustrates a case where the evaluation value 125 for the optical signal OS received by the optical receiver 31A is "70" and the evaluation value 125 for the optical signal OS received by the optical receiver 31D is "65." In this case, the determination unit 121 determines that the operation instruction is "S20."

[0093] If, among the optical signals OS received by the optical receivers 31A to 31E, the evaluation value 125 does not satisfy the condition 112A but there are not multiple optical signals OS whose evaluation value 125 satisfies the condition 112B, that is, if there is one or no optical signals OS whose evaluation value 125 satisfies the condition 112B, the judgment unit 121 judges the content of the operation instruction based on the optical signals OS received by the optical receivers 31F to 31J (first optical receiver).

[0094] When the optical signal OS is received by the optical receivers 31A and 31B (second optical receivers) but not by the optical receivers 31C to 31E (third optical receivers), the determination unit 121 determines the content of the operational instruction based on the optical signal OS, among the optical signals OS received by the optical receivers 31A and 31B, whose evaluation value 125 satisfies the condition 112A. For example, when there is only one optical signal OS, among the optical signals OS received by the optical receivers 31A and 31B, whose evaluation value 125 satisfies the condition 112A, the determination unit 121 identifies that one optical signal OS as the optical signal OS for determining the content of the operational instruction. Then, the determination unit 121 determines the content of the operational instruction based on the identified optical signal OS.

[0095] 29 , when the evaluation values ​​125 of the optical signals OS received by the optical receiver 31A and the optical receiver 31B all satisfy the condition 112A, the determination unit 121 identifies the optical signal OS with the largest evaluation value 125 as the optical signal OS for determining the content of the operation instruction, as indicated by hatching. Then, the determination unit 121 determines the content of the operation instruction based on the identified optical signal OS.

[0096] 29 illustrates a case where the evaluation value of the optical signal OS received by the optical receiver 31A is the maximum of "84" and the content of the operation instruction is "S10." In this case, the determination unit 121 identifies the optical signal OS received by the optical receiver 31A as the optical signal OS for determining the content of the operation instruction, and determines the content of the operation instruction to be "S10."

[0097] As an example, as shown in Figure 30, if the optical signal OS is received by the optical receiver 31A and the optical receiver 31B, but the optical signal OS is not received by the optical receivers 31C to 31E, and the evaluation value 125 of the optical signal OS received by the optical receiver 31A and the optical receiver 31B does not satisfy the condition 112A but does satisfy the condition 112B, the judgment unit 121 identifies the optical signal OS received by the optical receiver 31A and the optical receiver 31B that satisfies the condition 112B as the optical signal OS for judging the content of the operation instruction, as shown by the hatching.

[0098] 29 and 30 are performed not only when the optical signal OS is not received by the optical receivers 31C to 31E, but also in the following cases: That is, when none of the optical signals OS received by the optical receivers 31C to 31E satisfy the condition 112A. Also, when none of the optical signals OS received by the optical receivers 31C to 31E satisfy the condition 112B.

[0099] As an example, as shown in Figure 31, the determination unit 121 adopts the operation instruction content that appears most frequently among the operation instruction contents of the multiple optical signals OS identified as shown in Figure 30. Figure 31 illustrates a case where the operation instruction contents of the optical signals OS received by the optical receivers 31A and 31B are both "S15." In this case, the determination unit 121 determines the operation instruction content to be "S15." If the operation instruction contents of the optical signals OS received by the optical receivers 31A and 31B are different, the determination unit 121 adopts the operation instruction content with the highest evaluation value 125, as in the case shown in Figure 28.

[0100] The determination unit 121 determines the content of the operation instruction based on the optical signal OS received by the optical receivers 31F to 31J (first optical receivers) in the following cases: Namely, when the evaluation value 125 of the optical signal OS received by the optical receivers 31A and 31B does not satisfy the condition 112A; or when the evaluation value 125 of at least one of the optical signals OS received by the optical receivers 31A and 31B does not satisfy the condition 112B; that is, when there are not multiple optical signals OS whose evaluation values ​​125 satisfy the condition 112B.

[0101] 29 and 30, the projector 10 may be used in such a manner that the optical signal OS is received by the optical receivers 31A and 31B but not by the optical receivers 31C to 31E, as shown in the examples of the states of use shown in Figures 32 and 33. That is, this is a state of use in which the main body 12 is housed in the dashboard 131 of the automobile 130. The tip of the projection lens unit 11, including the front face 22 and the back face 24 on which the light receiving windows 23A and 23B are provided, is exposed from above the dashboard 131, and the base end of the projection lens unit 11, including the connection portion 17 and the like, is housed in the dashboard 131 together with the main body 12.

[0102] The projector 10 projects an image P onto the windshield 132 of the automobile 130 through the projection lens unit 11. The windshield 132 is an example of a "projection surface" according to the technology of the present disclosure. For example, the projector 10 projects the image P onto the windshield 132 while the automobile 130 is stopped. Furthermore, if autonomous driving of the automobile 130 becomes possible in the future, the projector 10 may project the image P onto the windshield 132 during autonomous driving. Note that autonomous driving refers to a mode in which the accelerator, brake, turn signals, steering wheel 133, and the like are operated automatically.

[0103] When the optical signal OS is not received by the optical receivers 31A to 31E (second and third optical receivers), the determination unit 121 determines the content of the operational instruction based on the optical signal OS received by the optical receivers 31F to 31J (first optical receivers). More specifically, the determination unit 121 determines the content of the operational instruction based on the optical signal OS, among the optical signals OS received by the optical receivers 31F to 31J, whose evaluation value 125 satisfies the condition 112C. For example, when there is only one optical signal OS, among the optical signals OS received by the optical receivers 31F to 31J, whose evaluation value 125 satisfies the condition 112C, the determination unit 121 identifies that one optical signal OS as the optical signal OS for determining the content of the operational instruction. The determination unit 121 then determines the content of the operational instruction based on the identified optical signal OS.

[0104] 34, when there are a plurality of optical signals OS whose evaluation values ​​125 satisfy the condition 112C among the optical signals OS received by the optical receivers 31F to 31J, the determination unit 121 identifies the optical signal OS with the largest evaluation value 125 as the optical signal OS for which the content of the operation instruction is to be determined, as indicated by hatching.Then, the content of the operation instruction is determined based on the identified optical signal OS.

[0105] 34 illustrates a case where the optical signal OS is received by all of the optical receivers 31F to 31J. The example also illustrates a case where the evaluation value of the optical signal OS received by the optical receiver 31I is the maximum, at "76," and the content of the operational instruction is "S10." In this case, the determination unit 121 identifies the optical signal OS received by the optical receiver 31I as the optical signal OS for determining the content of the operational instruction, and determines the content of the operational instruction to be "S10."

[0106] The reason for the "x6" for the light receiver 31H is that the evaluation value 125 does not satisfy the condition 112C. The "x7" for the light receiver 31F and the like is that the evaluation value 125 satisfies the condition 112C but is not the maximum.

[0107] The process shown in Fig. 34 is also performed when there is no optical signal OS that satisfies the condition 112A among the optical signals OS received by the optical receivers 31A to 31E. Also, the process shown in Fig. 34 is also performed when there are no optical signals OS that satisfy the condition 112B among the optical signals OS received by the optical receivers 31A to 31E.

[0108] As an example of the usage state of the projector 10 shown in Fig. 34, in which the optical signal OS is received by the optical receivers 31F to 31J but not by the optical receivers 31A to 31E, the usage state shown in Fig. 35 can be considered. That is, in this usage state, the projection lens unit 11 and the main body unit 12 are housed within the wall 140 of the room of the user U, and only the output lens L35 is exposed to the outside.

[0109] The projector 10 projects an image P through the projection lens unit 11 onto a screen 142 installed on a wall 141 opposite the wall 140. The screen 142 is an example of a "projection surface" according to the technology of the present disclosure. The output lens L35 is covered with a lid or the like when the projector 10 is not in use. The projector 10 can also be removed from the wall 140 for use. Furthermore, the projector 10 may project the image P directly onto the wall 141. In this case, the wall 141 is an example of a "projection surface" according to the technology of the present disclosure.

[0110] Next, the operation of the above configuration will be described with reference to the flowcharts shown in FIGS. 36 to 38 as an example.

[0111] In the projector 10, image light formed in the image forming unit 14 first enters the lens L11 of the first optical system OP1 of the projection lens section 11. The image light then passes through lenses L12 and L13, and the amount of light is adjusted by passing through the fixed diaphragm 43. The image light whose amount has been adjusted by the fixed diaphragm 43 passes through lens L14 and then lens L15. Aberrations of the image light are corrected by the lens L15 and the like.

[0112] The image light that has passed through the lens L15 is incident on the lens L16. An intermediate image MI is formed on the reduction side of the first mirror 48, i.e., at a position between the lens L16 and the first mirror 48.

[0113] The image light that has passed through the lens L16 is bent by 90 degrees by the first mirror 48 to become light of the second optical axis A2, and passes through the second optical system OP2.

[0114] The image light that has passed through the second optical system OP2 is bent again by 90 degrees by the second mirror 49 to become light along the third optical axis A3. The image light then passes through lenses L31, L32, L33, and L34 that make up the third optical system OP3, and finally passes through the output lens L35, and is projected as an image P onto the projection surface.

[0115] As shown in FIG. 19, when the operating program 110 is started, the CPU 106 functions as a derivation unit 120 , a determination unit 121 , an instruction receiving unit 122 , and a drive signal generating unit 123 .

[0116] The user U issues operation instructions by pressing operation buttons on the remote controller 13 to cause the projector 10 to perform desired operations such as turning the power on / off, adjusting brightness, selecting a menu, moving the zoom lens ZL, and moving the focus lens FL. This causes an optical signal OS to be emitted from the remote controller 13. The optical signal OS is received by the optical receiver 31 (YES in step ST100).

[0117] An electrical signal ES corresponding to the optical signal OS is input to the derivation unit 120. Then, as shown in Fig. 20, an evaluation value 125 of the electrical signal ES (optical signal OS) is derived in the derivation unit 120 (step ST105). The evaluation value 125 is output from the derivation unit 120 to the determination unit 121.

[0118] First, the determination unit 121 determines whether the evaluation value 125 of the optical signal OS received by any of the optical receivers 31A to 31E (second and third optical receivers) is greater than 0, i.e., whether the optical signal OS was received by the second or third optical receiver (step ST110). If the evaluation value 125 of the optical signal OS received by the optical receivers 31A to 31E is greater than 0, i.e., if the optical signal OS was received by the second or third optical receiver (YES in step ST110), the process proceeds to step ST115. On the other hand, if the evaluation values ​​125 of the optical signals OS received by the optical receivers 31A to 31E are all 0, i.e., if the optical signal OS was not received by the second or third optical receiver (NO in step ST110), the process proceeds to step ST150 in FIG. 37.

[0119] In step ST115, the determination unit 121 determines whether or not there is an optical signal OS whose evaluation value 125 satisfies the condition 112A among the optical signals OS received by the optical receivers 31A to 31E. If there is an optical signal OS whose evaluation value 125 satisfies the condition 112A among the optical signals OS received by the optical receivers 31A to 31E (YES in step ST115), the process proceeds to step ST120. On the other hand, if there is no optical signal OS whose evaluation value 125 satisfies the condition 112A among the optical signals OS received by the optical receivers 31A to 31E (NO in step ST115), the process proceeds to step ST180 in FIG.

[0120] In step ST120, as shown in FIG. 24 , the determination unit 121 identifies the optical signal OS with the largest evaluation value 125 among the optical signals OS whose evaluation values ​​125 satisfy the condition 112A as the optical signal OS for determining the content of the operation instruction. Then, the content of the operation instruction is determined based on the identified optical signal OS. Although not shown in the figure, if there is only one optical signal OS whose evaluation value 125 satisfies the condition 112A among the optical signals OS received by the optical receivers 31A to 31E, the determination unit 121 identifies that single optical signal OS as the optical signal OS for determining the content of the operation instruction. Then, the content of the operation instruction is determined based on the identified optical signal OS. A determination result 126 of the content of the operation instruction is output from the determination unit 121 to the drive signal generation unit 123.

[0121] 37, in step ST150, the determination unit 121 determines whether the evaluation value 125 of the optical signal OS received by any of the optical receivers 31F to 31J (first optical receivers) is greater than 0, i.e., whether the optical signal OS was received by the first optical receiver. If the evaluation value 125 of the optical signal OS received by the optical receivers 31F to 31J is greater than 0, i.e., if the optical signal OS was received by the first optical receiver (YES in step ST150), the process proceeds to step ST155. On the other hand, if the evaluation values ​​125 of the optical signals OS received by the optical receivers 31F to 31J are all 0, i.e., if the optical signal OS was not received by the first optical receiver (NO in step ST150), the process proceeds to step ST130 in FIG.

[0122] In step ST155, the determination unit 121 determines whether or not there is an optical signal OS whose evaluation value 125 satisfies the condition 112C among the optical signals OS received by the optical receivers 31F to 31J. If there is an optical signal OS whose evaluation value 125 satisfies the condition 112C among the optical signals OS received by the optical receivers 31F to 31J (YES in step ST155), the process proceeds to step ST160. On the other hand, if there is no optical signal OS whose evaluation value 125 satisfies the condition 112C among the optical signals OS received by the optical receivers 31F to 31J (NO in step ST155), the process proceeds to step ST130 in FIG.

[0123] In step ST160, as shown in FIG. 34 , the determination unit 121 identifies the optical signal OS with the largest evaluation value 125 among the optical signals OS whose evaluation values ​​125 satisfy the condition 112C as the optical signal OS for determining the content of the operation instruction. Then, the content of the operation instruction is determined based on the identified optical signal OS. The processing proceeds to step ST125 in FIG. 36 . Although not shown, if there is only one optical signal OS whose evaluation value 125 satisfies the condition 112C among the optical signals OS received by the optical receivers 31F to 31J, the determination unit 121 identifies that single optical signal OS as the optical signal OS for determining the content of the operation instruction. Then, the content of the operation instruction is determined based on the identified optical signal OS. A determination result 126 of the content of the operation instruction is output from the determination unit 121 to the drive signal generation unit 123.

[0124] 38, in step ST180, the determination unit 121 determines whether or not there is an optical signal OS whose evaluation value 125 satisfies condition 112B among the optical signals OS received by the optical receivers 31A to 31E (second and third optical receivers). If there is an optical signal OS whose evaluation value 125 satisfies condition 112B among the optical signals OS received by the optical receivers 31A to 31E (YES in step ST180), the process proceeds to step ST185. On the other hand, if there is no optical signal OS whose evaluation value 125 satisfies condition 112B among the optical signals OS received by the optical receivers 31A to 31E (NO in step ST180), the process proceeds to step ST150 in FIG.

[0125] In step ST185, the determination unit 121 determines whether or not there are multiple optical signals OS whose evaluation values ​​125 satisfy the condition 112B among the optical signals OS received by the optical receivers 31A to 31E. If there are multiple optical signals OS whose evaluation values ​​125 satisfy the condition 112B among the optical signals OS received by the optical receivers 31A to 31E (YES in step ST185), the process proceeds to step ST190. On the other hand, if there are not multiple optical signals OS whose evaluation values ​​125 satisfy the condition 112B among the optical signals OS received by the optical receivers 31A to 31E (NO in step ST185), the process proceeds to step ST150 in FIG.

[0126] In step ST190, as shown in Fig. 25, the determination unit 121 identifies a plurality of optical signals OS whose evaluation values ​​125 satisfy the condition 112B as optical signals OS for determining the content of the operation instruction. Then, as shown in Figs. 26 to 28, the content of the operation instruction is determined based on the identified optical signals OS. The processing proceeds to step ST125 in Fig. 36. The determination result 126 of the content of the operation instruction is output from the determination unit 121 to the drive signal generation unit 123.

[0127] 36 , in step ST125, a drive signal DS corresponding to the content of the operation instruction in the determination result 126 is output from the drive signal generating unit 123 to the desired receiver. The receiver that receives the drive signal DS performs driving in accordance with the drive signal DS. For example, if the drive signal DS is a signal related to zooming, the zoom lens drive mechanism 91 as the receiver moves the zoom lens ZL along the first optical axis A1. This series of processes is repeated until the projector 10 is powered off (YES in step ST130).

[0128] As described above, the projector 10 includes the projection lens unit 11, which includes the bending optical system BOP that projects image light onto the projection surface, and the light receivers 31A, 31B, and 31F to 31J that are provided in the projection lens unit 11 and receive the optical signal OS emitted from the remote controller 13. The light receivers 31F to 31J are positioned so that they can receive the optical signal OS that has passed through at least a portion of the bending optical system BOP. The light receivers 31A and 31B are positioned so that they can receive the optical signal OS without passing through the bending optical system BOP. This reduces the risk of the remote controller 13 being unable to perform remote operation, compared to when only the light receivers 31A and 31B are provided, or when only the light receivers 31F to 31J are provided. In particular, the presence of the light receivers 31F to 31J makes it possible to perform remote operation using the remote controller 13 even in the usage state shown in FIG. 35 in which the projection lens unit 11 and the main body unit 12 are covered.

[0129] 20, the derivation unit 120 derives an evaluation value 125 relating to the quality of the optical signals received by the optical receivers 31A and 31B and the optical receivers 31F to 31J. As shown in FIGS. 29 and 30, the determination unit 121 identifies an optical signal OS for determining the content of an operation instruction based on the evaluation value 125. Therefore, it is possible to identify a more appropriate optical signal OS as the optical signal OS for determining the content of an operation instruction.

[0130] 29, the determination unit 121 determines the content of the operation instruction based on the optical signal OS whose evaluation value 125 satisfies the preset condition 112A among the optical signals OS received by the optical receiver 31A and the optical receiver 31B. This reduces the risk of erroneous determination of the content of the operation instruction.

[0131] 29 , when the evaluation values ​​125 of the optical signals OS received by the optical receivers 31A and 31B satisfy the condition 112A, the determination unit 121 determines the content of the operation instruction based on the optical signal OS having the largest evaluation value 125. This further reduces the risk of erroneous determination of the content of the operation instruction.

[0132] 30 and 31 , when the evaluation value 125 of the optical signal OS received by the optical receiver 31A and the optical receiver 31B does not satisfy the condition 112A but satisfies the condition 112B, which is more lenient than the condition 112A, the determination unit 121 determines the content of the operational instruction based on the optical signal OS received by the optical receiver 31A and the optical receiver 31B that satisfies the condition 112B. Therefore, the content of the operational instruction can be determined even if there is no optical signal OS whose evaluation value 125 satisfies the condition 112A. As a result, the risk of falling into a situation where remote operation by the remote controller 13 is not possible can be further reduced.

[0133] 34, the determination unit 121 determines the content of the operation instruction based on the optical signals OS received by the optical receivers 31F to 31J in the following cases: when the optical signals OS are not received by the optical receivers 31A and 31B; when there is no optical signal OS among the optical signals OS received by the optical receivers 31A and 31B whose evaluation values ​​125 satisfy the condition 112A; or when there are no multiple optical signals OS among the optical signals OS received by the optical receivers 31A and 31B whose evaluation values ​​125 satisfy the condition 112B. This further reduces the risk of falling into a situation where remote operation by the remote controller 13 is not possible.

[0134] 34, the determination unit 121 determines the content of the operation instruction based on the optical signal OS, of which the evaluation value 125 satisfies the condition 112C, which is stricter than the condition 112B, among the optical signals OS received by the optical receivers 31F to 31J. This reduces the risk of erroneous determination of the content of the operation instruction.

[0135] 34, when there are a plurality of optical signals OS whose evaluation values ​​125 satisfy the condition 112C among the optical signals OS received by the optical receivers 31F to 31J, the determination unit 121 determines the content of the operation instruction based on the optical signal OS whose evaluation value 125 is the largest. This can further reduce the risk of erroneous determination of the content of the operation instruction.

[0136] The projector 10 includes a main body 12 that includes a projection lens 11 and an image forming unit 14 that forms image light, and photoreceivers 31C to 31E that are provided in the main body 12 and receive the optical signal OS. This further reduces the risk of the projector 10 being unable to be remotely controlled by the remote controller 13.

[0137] 20, the derivation unit 120 derives an evaluation value 125 relating to the quality of the optical signal OS received by the optical receivers 31A to 31J. As shown in FIG. 24 and other figures, the determination unit 121 identifies the optical signal OS for determining the content of the operation instruction based on the evaluation value 125. Therefore, it is possible to identify a more appropriate optical signal OS as the optical signal OS for determining the content of the operation instruction.

[0138] 24, the determination unit 121 determines the content of the operation instruction based on the optical signal OS, of which the evaluation value 125 satisfies the preset condition 112A, among the optical signals OS received by the optical receivers 31A to 31E. This reduces the risk of erroneous determination of the content of the operation instruction.

[0139] 24, when there are a plurality of optical signals OS whose evaluation values ​​125 satisfy the condition 112A among the optical signals OS received by the optical receivers 31A to 31E, the determination unit 121 determines the content of the operation instruction based on the optical signal OS whose evaluation value 125 is the largest. This further reduces the risk of erroneous determination of the content of the operation instruction.

[0140] 25 to 28, when there are multiple optical signals OS received by the optical receivers 31A to 31E whose evaluation values ​​125 do not satisfy the condition 112A but satisfy the condition 112B, which is more lenient than the condition 112A, the determination unit 121 determines the content of the operation instruction based on the multiple optical signals OS that satisfy the condition 112B. Therefore, even if there is no optical signal OS whose evaluation value 125 satisfies the condition 112A, the content of the operation instruction can be determined. As a result, the risk of falling into a situation where remote operation by the remote controller 13 is not possible can be further reduced.

[0141] 34, the determination unit 121 determines the content of the operation instruction based on the optical signals OS received by the optical receivers 31F to 31J in the following cases: when the optical signals OS are not received by the optical receivers 31A to 31E; when there is no optical signal OS among the optical signals OS received by the optical receivers 31A to 31E whose evaluation value 125 satisfies the condition 112A; or when there are no multiple optical signals OS among the optical signals OS received by the optical receivers 31A to 31E whose evaluation value 125 satisfies the condition 112B. This further reduces the risk of falling into a situation where remote operation by the remote controller 13 is not possible.

[0142] 39 and 40 may be shown as examples when the determination unit 121 determines the content of an operational instruction based on the optical signals OS received by the optical receivers 31F to 31J. That is, when there are a plurality of optical signals OS among the optical signals OS received by the optical receivers 31F to 31J whose evaluation values ​​125 do not satisfy the condition 112C but do satisfy the condition 112B, the determination unit 121 identifies the plurality of optical signals OS that satisfy the condition 112B as the optical signals OS for determining the content of the operational instruction, as indicated by hatching.

[0143] 39 illustrates a case where the optical signal OS is received by all of the optical receivers 31F to 31J. The example also illustrates a case where the evaluation values ​​125 of the optical signals OS received by the optical receivers 31F to 31I do not satisfy the condition 112C but do satisfy the condition 112B. In this case, the determination unit 121 identifies the optical signals OS received by the optical receivers 31F to 31I as the optical signals OS for determining the content of the operation instruction. The "x8" for the optical receiver 31J is because the evaluation value 125 does not satisfy the condition 112B either.

[0144] As an example, as shown in Fig. 40, the determination unit 121 adopts the operation instruction content that appears most frequently among the operation instruction contents of the multiple optical signals OS identified as shown in Fig. 39. Fig. 40 illustrates a case where only the operation instruction content of the optical signal OS received by the optical receiver 31F is "S11" and the others are "S10." In this case, the determination unit 121 determines the operation instruction content to be "S10." This modification also further reduces the risk of erroneously determining the operation instruction content.

[0145] If the frequency of occurrence of the content of the operation instruction is the same for two or more types of content of the operation instruction, the determination unit 121 adopts the content of the operation instruction with the highest average value of the evaluation value 125, as in the case shown in Fig. 27. Furthermore, if there are two optical signals OS whose evaluation values ​​125 satisfy the condition 112B and the content of the operation instructions of the two optical signals OS differ, the determination unit 121 adopts the content of the operation instruction with the highest evaluation value 125, as in the case shown in Fig. 28.

[0146] 41 as an example, the CPU 106 of the second embodiment functions as a read / write (hereinafter abbreviated as RW (Read Write)) control unit 150 in addition to the processing units 120 to 123 (the instruction receiving unit 122 and the drive signal generating unit 123 are not shown) of the first embodiment. The RW control unit 150 controls reading of various data from the storage 105 and storing of various data in the storage 105.

[0147] The RW control unit 150 receives the determination result 126 from the determination unit 121. The RW control unit 150 controls the storage of information about the optical receiver 31 that received the optical signal OS used to determine the content of the operation instruction, which information is included in the determination result 126, in history information 151 in the storage 105. The history information 151 includes information about the optical receiver 31 that received the optical signal OS used to determine the content of the last five operation instructions. The RW control unit 150 outputs the history information 151 to the derivation unit 120 and the determination unit 121.

[0148] The determination unit 121 identifies the optical signal OS for determining the content of the operation instruction based on the history information 151 in addition to the evaluation value 125. Specifically, as shown in the flowchart of FIG. 42 , when the optical signal OS is received by the optical receiver 31 (YES in step ST100), the determination unit 121 refers to the history information 151 and determines whether the optical receiver 31 that received the optical signal OS used to determine the content of the past operation instruction is the same five times in a row (step ST200). If the optical receiver 31 that received the optical signal OS used to determine the content of the past operation instruction is the same five times in a row (YES in step ST200), the determination unit 121 proceeds to step ST205. On the other hand, if the optical receiver 31 that received the optical signal OS used to determine the content of the past operation instruction is not the same five times in a row (NO in step ST200), the determination unit 121 proceeds to step ST105 of FIG. 36 .

[0149] In step ST205, the derivation unit 120 derives only the evaluation value 125 of the optical signal OS received by the optical receiver 31 (hereinafter referred to as optical receiver 31X or optical receiver X) that received the optical signal OS used to determine the content of the past operation instruction five consecutive times. Then, the determination unit 121 determines whether the evaluation value 125 of the optical signal OS received by the optical receiver 31X is greater than 0, i.e., whether the optical signal OS was received by the optical receiver 31X (step ST210). If the evaluation value 125 of the optical signal OS received by the optical receiver 31X is greater than 0, i.e., if the optical signal OS was received by the optical receiver 31X (YES in step ST210), the process proceeds to step ST215. On the other hand, if the evaluation value 125 of the optical signal OS received by the optical receiver 31X is 0, that is, if the optical signal OS is not received by the optical receiver 31X (NO in step ST210), proceed to step ST105 in FIG.

[0150] In step ST215, the determination unit 121 determines whether or not the evaluation value 125 of the optical signal OS received by the optical receiver 31X satisfies the condition 112A. If the evaluation value 125 of the optical signal OS received by the optical receiver 31X satisfies the condition 112A (YES in step ST215), the process proceeds to step ST220. On the other hand, if the evaluation value 125 of the optical signal OS received by the optical receiver 31X does not satisfy the condition 112A (NO in step ST215), the process proceeds to step ST105 in FIG.

[0151] In step ST220, the determination unit 121 identifies the optical signal OS received by the optical receiver 31X as the optical signal OS for determining the content of the operational instruction. Then, the content of the operational instruction is determined based on the identified optical signal OS. The process proceeds to step ST125 in FIG. 36 .

[0152] As described above, in the second embodiment, the RW control unit 150 controls the storage 105 to store the history information 151 of the optical receiver 31 that received the optical signal OS used to determine the content of the operation instruction. The determination unit 121 identifies the optical signal OS for determining the content of the operation instruction based on the history information 151 as well as the evaluation value 125. This makes it possible to preferentially select the optical receiver 31 whose received optical signal OS is often used to determine the content of the operation instruction. This makes it possible to omit unnecessary processing, such as deriving the evaluation values ​​125 of all the optical receivers 31.

[0153] If the optical receiver 31 that received the optical signal OS used to determine the content of the operation instruction is the same for, for example, 50 consecutive times, and it is highly unlikely that an optical signal OS received by an optical receiver 31 other than that optical receiver 31 (hereinafter referred to as optical receiver 31Y) will be used to determine the content of the operation instruction, the optical signal OS used to determine the content of the operation instruction may be fixed to the optical signal OS received by optical receiver 31Y.

[0154] 43 as an example, a light receiver to be used selection screen 160 is displayed on the projection surface in response to an operation instruction from the user U via the remote controller 13 or the operation unit 21. The light receiver to be used selection screen 160 is a screen that allows the user U to select which type of light receiver 31 to use from light receivers 31F to 31J (first light receivers), light receivers 31A and 31B (second light receivers), and light receivers 31C to 31E (third light receivers). The light receiver to be used selection screen 160 is provided with a selection button 161 for light receivers 31F to 31J (first light receivers), a selection button 162 for light receivers 31A and 31B (second light receivers), and a selection button 163 for light receivers 31C to 31E (third light receivers). An OK button 164 is provided at the bottom of the receiver selection screen 160. The selection buttons 161 to 163 are all selected by default as shown in the figure.

[0155] The user U operates the remote controller 13 or the operation unit 21 to select or deselect the selection buttons 161 to 163 of the desired type of light receiver 31, and selects the OK button 164. This causes the instruction acceptance unit 122 to accept an instruction to select the light receiver 31. The instruction acceptance unit 122 outputs the accepted selection instruction to the derivation unit 120 and the determination unit 121.

[0156] The derivation unit 120 derives an evaluation value 125 of the optical signal OS received by the optical receiver 31 selected on the optical receiver selection screen 160 based on a selection instruction from the instruction receiving unit 122. Similarly, the determination unit 121 identifies an optical signal OS for determining the content of an operational instruction from the optical signal OS received by the optical receiver 31 selected on the optical receiver selection screen 160 based on a selection instruction from the instruction receiving unit 122. For example, if only optical receivers 31F to 31J (first optical receivers) are selected on the optical receiver selection screen 160, the derivation unit 120 derives only the evaluation value 125 of the optical signal OS received by the optical receivers 31F to 31J. The determination unit 121 identifies an optical signal OS for determining the content of an operational instruction from only the optical signal OS received by the optical receivers 31F to 31J.

[0157] As described above, in the third embodiment, the instruction receiving unit 122 receives a selection instruction from the user U. The determination unit 121 identifies an optical signal OS for determining the content of the operation instruction based on the selection instruction. This allows the intention of the user U to be reflected in the identification of the optical signal OS for determining the content of the operation instruction. For example, in the usage state shown in FIG. 35 where use of the photoreceivers 31A and 31B and the photoreceivers 31C to 31E is not anticipated in the first place, by selecting to use only the photoreceivers 31F to 31J, it is possible to omit unnecessary processing such as deriving the evaluation value 125 of the photoreceiver 31 that is not expected to be used.

[0158] There may be only one first light receiver. Similarly, there may be only one second light receiver and one third light receiver. Also, the third light receiver may not be provided. In that case, the content of the operation instruction may be determined by performing the processes shown in Figures 29 to 31.

[0159] Although the light receiver 31 is attached to the first surface 60, the present invention is not limited to this. Instead of or in addition to the first surface 60, the light receiver 31 may be attached to the intermediate surface 63. A plurality of light receiving units 30 may be attached to the intermediate surface 63.

[0160] Furthermore, instead of or in addition to the first surface 60 and / or the intermediate surface 63, the light receiver 31 may be attached to the second surface 61. A plurality of light receiving units 30 may be attached to the second surface 61. A light receiving unit 30 may be attached to the third surface 62.

[0161] A plurality of light-receiving units 30 may be attached to the rear surface 86 of the second mirror 49 at positions facing each other. In this case, it is preferable to arrange the light-receiving units 30 at symmetrical positions. The light-receiving units 30 may also be attached around the first mirror 48.

[0162] The circuit boards 32 of the plurality of light receiving units 30 may be a single common circuit board 32. In this case, wiring is extended from the light receivers 31 of the plurality of light receiving units 30 and connected to the single common circuit board 32.

[0163] The conditions 112A to 112C are not limited to the contents exemplified in Figures 21 to 23. The conditions 112A to 112C may be configured so that the user U can change the settings.

[0164] Although the above embodiment illustrates a substantially Z-shaped bending optical system BOP having a first optical axis A1, a second optical axis A2, and a third optical axis A3, the present invention is not limited to this. Alternatively, the first optical system OP1 and the second optical system OP2 may be connected in the Z direction, the first optical axis A1 and the second optical axis A2 may be integrated into a single optical axis, and the integrated optical axis and the third optical axis A3 may be integrated into a substantially L-shaped bending optical system BOP. Furthermore, the above embodiment illustrates a magnifying optical system as the optical system, but the present invention is not limited to this. Alternatively, the present invention may be a reducing optical system.

[0165] A transmissive image forming panel using a liquid crystal display (LCD) element may be used instead of the DMD as the image forming panel 15. Also, instead of the DMD, a panel using a self-luminous element such as an LED (Light Emitting Diode) or an organic EL (Electro Luminescence) may be used.

[0166] Although an example in which a laser light source is used as the light source 16 has been described, the present invention is not limited to this, and a mercury lamp, an LED, or the like may also be used as the light source 16. Furthermore, although a blue laser light source and a yellow phosphor are used as the light source 16, the present invention is not limited to this, and a green phosphor and a red phosphor may be used instead of the yellow phosphor. Furthermore, a green laser light source and a red laser light source may be used instead of the yellow phosphor.

[0167] In each of the above embodiments, the following various processors can be used as the hardware structure of processing units that perform various processes, such as the derivation unit 120, the determination unit 121, the instruction reception unit 122, the drive signal generation unit 123, and the RW control unit 150. The various processors include the CPU 106, which is a general-purpose processor that executes software (operation program 110) and functions as various processing units, as described above, as well as dedicated electrical circuits that are processors having a circuit configuration specifically designed to perform specific processes, such as a programmable logic device (PLD) that is a processor whose circuit configuration can be changed after manufacture, such as an FPGA (Field Programmable Gate Array), and an ASIC (Application Specific Integrated Circuit).

[0168] A single processing unit may be configured with one of these various processors, or may be configured with a combination of two or more processors of the same or different types (e.g., a combination of multiple FPGAs and / or a combination of a CPU and an FPGA).Furthermore, multiple processing units may be configured with a single processor.

[0169] Examples of configuring multiple processing units with a single processor include, first, a form in which one processor is configured with a combination of one or more CPUs and software, as typified by computers such as client and server, and this processor functions as multiple processing units. Second, a form in which a processor is used to realize the functions of the entire system including multiple processing units with a single IC (Integrated Circuit) chip, as typified by systems on chips (SoCs). In this way, various processing units are configured using one or more of the above-mentioned various processors as a hardware structure.

[0170] Furthermore, more specifically, the hardware structure of these various processors can be an electric circuit (circuitry) that combines circuit elements such as semiconductor elements.

[0171] From the above description, the technology described in the following supplementary paragraphs can be understood.

[0172] [Supplementary Item 1] A projection device comprising: a projection lens unit including an optical system that projects image light onto a projection surface; and first and second optical receivers provided in the projection lens unit that receive optical signals emitted from a remote controller, wherein the first optical receiver is positioned so that it can receive the optical signal that has passed through at least a portion of the optical system, and the second optical receiver is positioned so that it can receive the optical signal without passing through the optical system. [Supplementary Item 2] The projection device according to Supplementary Item 1, further comprising: a first processor that derives evaluation values ​​related to the quality of the optical signals received by the first and second optical receivers, and identifies the optical signal for determining the content of an operation instruction based on the evaluation values. [Supplementary Item 3] The projection device according to Supplementary Item 2, wherein the first processor determines the content of the operation instruction based on the optical signals received by the second optical receiver, the evaluation values ​​of which satisfy a first predetermined condition. [Supplementary Item 4] The projection device according to Supplementary Item 3, wherein a plurality of the second optical receivers are provided, and when there are a plurality of optical signals received by the plurality of second optical receivers whose evaluation values ​​satisfy the first condition, the first processor determines the content of the operation instruction based on the optical signal with the largest evaluation value. [Supplementary Item 5] The projection device according to Supplementary Item 3 or Supplementary Item 4, wherein a plurality of the second optical receivers are provided, and when there are a plurality of optical signals received by the plurality of second optical receivers whose evaluation values ​​do not satisfy the first condition but satisfy a second condition that is looser than the first condition, the first processor determines the content of the operation instruction based on the plurality of optical signals that satisfy the second condition. [Supplementary Item 6] The projection device described in Supplementary Item 5, wherein the first processor determines the content of the operation instruction based on the optical signal received by the first optical receiver in the following cases: when the optical signal is not received by the second optical receiver; when there is no optical signal among the optical signals received by the second optical receiver whose evaluation value satisfies the first condition; and when there are no multiple optical signals among the optical signals received by the second optical receiver whose evaluation value satisfies the second condition.[Supplementary Item 7] The projection device according to Supplementary Item 6, wherein the first processor determines the content of the operation instruction based on an optical signal, of the optical signals received by the first optical receiver, whose evaluation value satisfies a third condition that is stricter than the second condition. [Supplementary Item 8] The projection device according to Supplementary Item 7, wherein a plurality of first optical receivers are provided, and when a plurality of optical signals, of the optical signals received by the plurality of first optical receivers, have their evaluation values ​​satisfy the third condition, the first processor determines the content of the operation instruction based on the optical signal with the largest evaluation value. [Supplementary Item 9] The projection device according to any one of Supplementary Items 2 to 8, wherein the first processor controls a storage unit to store history information of optical receivers that received the optical signals used to determine the content of the operation instruction, and identifies the optical signal for determining the content of the operation instruction based on the history information in addition to the evaluation value. [Supplementary Item 10] The projection device according to Supplementary Item 1, comprising: a main body section in which the projection lens section is provided and which includes an image forming unit that forms the image light; and a third light receiver that is provided on the main body section and receives the optical signal. [Supplementary Item 11] The projection device according to Supplementary Item 10, further comprising: a second processor that derives evaluation values ​​related to the quality of the optical signals received by the first light receiver, the second light receiver, and the third light receiver, and identifies the optical signal for determining the content of an operation instruction based on the evaluation values. [Supplementary Item 12] The projection device according to Supplementary Item 11, wherein the second processor determines the content of the operation instruction based on the optical signals received by the second light receiver and the third light receiver, the evaluation values ​​of which satisfy a fourth predetermined condition. [Supplementary Item 13] The projection device described in Supplementary Item 12, wherein the second processor, when there are multiple optical signals among the optical signals received by the second optical receiver and the third optical receiver whose evaluation values ​​satisfy the fourth condition, determines the content of the operation instruction based on the optical signal with the largest evaluation value.[Supplementary Item 14] The projection device according to Supplementary Item 12 or Supplementary Item 13, wherein, when there are multiple optical signals, among the optical signals received by the second and third optical receivers, whose evaluation values ​​do not satisfy the fourth condition but satisfy a fifth condition that is more lenient than the fourth condition, the second processor determines the content of the operation instruction based on the multiple optical signals that satisfy the fifth condition. [Supplementary Item 15] The projection device according to Supplementary Item 14, wherein the second processor determines the content of the operation instruction based on the optical signal received by the first optical receiver when the optical signal is not received by the second and third optical receivers, when there is no optical signal, among the optical signals received by the second and third optical receivers, whose evaluation value satisfies the fourth condition, and when there are multiple optical signals, among the optical signals received by the second and third optical receivers, whose evaluation value satisfies the fifth condition. [Supplementary Item 16] The projection device according to Supplementary Item 15, wherein the second processor determines the content of the operation instruction based on an optical signal, of the optical signals received by the first optical receiver, whose evaluation value satisfies a sixth condition that is stricter than the fifth condition. [Supplementary Item 17] The projection device according to Supplementary Item 16, wherein a plurality of first optical receivers are provided, and when a plurality of optical signals, of the optical signals received by the plurality of first optical receivers, have their evaluation values ​​satisfy the sixth condition, the second processor determines the content of the operation instruction based on the optical signal with the largest evaluation value. [Supplementary Item 18] The projection device according to any one of Supplementary Items 11 to 17, wherein the second processor controls a storage unit to store history information of optical receivers that received the optical signals used to determine the content of the operation instruction, and identifies the optical signal for determining the content of the operation instruction based on the history information in addition to the evaluation value. [Supplementary Item 19] The projection device according to claim 1, further comprising a third processor, wherein the third processor receives a selection instruction from a user, and identifies the optical signal for determining the content of an operation instruction based on the selection instruction.[Supplementary Item 20] A projection device comprising: a plurality of optical receivers that receive optical signals emitted from a remote controller; and a processor, wherein the processor derives evaluation values ​​regarding the quality of the optical signals received by the plurality of optical receivers, and identifies the optical signals for determining the content of the operation instruction based on the evaluation values.

[0173] The technology described in Supplementary Item 20 has the effect of reducing the risk of a situation where remote operation by the remote controller 13 becomes impossible. Also, it has the effect of being able to identify a more appropriate optical signal OS as the optical signal OS for determining the content of an operation instruction.

[0174] The technology of the present disclosure can be appropriately combined with the various embodiments and modifications described above. Furthermore, it is needless to say that the present disclosure is not limited to the above embodiments and various configurations can be adopted as long as they do not deviate from the gist of the present disclosure.

[0175] The above-described description and illustrations are a detailed explanation of the parts related to the technology of the present disclosure and are merely an example of the technology of the present disclosure. For example, the above description of the configuration, functions, actions, and effects is an explanation of an example of the configuration, functions, actions, and effects of the parts related to the technology of the present disclosure. Therefore, it goes without saying that unnecessary parts may be deleted, new elements may be added, or replacements may be made to the above-described description and illustrations within the scope of the gist of the technology of the present disclosure. Furthermore, to avoid confusion and facilitate understanding of the parts related to the technology of the present disclosure, the above-described description and illustrations omit explanations of common technical knowledge that do not require particular explanation to enable the implementation of the technology of the present disclosure.

[0176] In this specification, "A and / or B" is synonymous with "at least one of A and B." In other words, "A and / or B" means that it may be only A, only B, or a combination of A and B. Furthermore, in this specification, the same concept as "A and / or B" is also applied when three or more things are expressed by connecting them with "and / or."

[0177] All publications, patent applications, and technical standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, or technical standard was specifically and individually indicated to be incorporated by reference.

Claims

1. a projection lens unit including an optical system that projects image light onto a projection surface; a first light receiver and a second light receiver provided in the projection lens unit for receiving an optical signal emitted from a remote controller; a first processor; Equipped with the first optical receiver is disposed at a position where it can receive the optical signal that has passed through at least a part of the optical system; the second optical receiver is disposed at a position where it can receive the optical signal without passing through the optical system; The first processor deriving an evaluation value relating to the quality of the optical signals received by the first optical receiver and the second optical receiver; determining the content of the operation instruction based on the optical signal, of which the evaluation value satisfies a predetermined first condition, among the optical signals received by the second optical receiver; Projection device.

2. a plurality of second light receivers are provided, The first processor 2. The projection device according to claim 1, wherein, when there are multiple optical signals among the optical signals received by the multiple second optical receivers whose evaluation values ​​satisfy the first condition, the content of the operation instruction is determined based on the optical signal with the largest evaluation value.

3. a plurality of second light receivers are provided, The first processor 2. The projection device of claim 1, wherein, among the optical signals received by the plurality of second optical receivers, if there are a plurality of optical signals whose evaluation values ​​do not satisfy the first condition but satisfy a second condition that is more lenient than the first condition, the content of the operation instruction is determined based on the plurality of optical signals that satisfy the second condition.

4. The first processor When the optical signal is not received by the second optical receiver, when there is no optical signal among the optical signals received by the second optical receiver whose evaluation value satisfies the first condition, and when there are not a plurality of optical signals among the optical signals received by the second optical receiver whose evaluation value satisfies the second condition, The projection device according to claim 3 , wherein the content of the operation instruction is determined based on the optical signal received by the first optical receiver.

5. The first processor The projection device according to claim 4 , wherein the content of the operation instruction is determined based on the optical signal received by the first optical receiver, the evaluation value of which satisfies a third condition that is stricter than the second condition.

6. a plurality of the first light receivers are provided, The first processor 6. A projection device as described in claim 5, wherein, when there are multiple optical signals among the optical signals received by the multiple first optical receivers whose evaluation values ​​satisfy the third condition, the content of the operation instruction is determined based on the optical signal with the largest evaluation value.

7. The first processor performing control to store in a storage unit history information of the optical receiver that received the optical signal used to determine the content of the operation instruction; The projection device according to claim 1 , wherein the optical signal for determining the content of the operation instruction is identified based on the history information in addition to the evaluation value.

8. a main body portion including an image forming unit in which the projection lens portion is provided and which forms the image light; The projection device according to claim 1 , further comprising: a third light receiver provided in the main body portion and configured to receive the optical signal.

9. a second processor; The second processor deriving an evaluation value relating to the quality of the optical signals received by the first optical receiver, the second optical receiver, and the third optical receiver; The projection device according to claim 8 , wherein the optical signal for determining the content of an operation instruction is identified based on the evaluation value.

10. The second processor The projection device according to claim 9, wherein the content of the operation instruction is determined based on the optical signal, of the optical signals received by the second optical receiver and the third optical receiver, whose evaluation value satisfies a predetermined fourth condition.

11. The second processor 11. The projection device of claim 10, wherein if there are multiple optical signals among the optical signals received by the second optical receiver and the third optical receiver whose evaluation values ​​satisfy the fourth condition, the content of the operation instruction is determined based on the optical signal with the largest evaluation value.

12. The second processor 11. The projection device of claim 10, wherein if there are multiple optical signals among the optical signals received by the second optical receiver and the third optical receiver whose evaluation values ​​do not satisfy the fourth condition but satisfy a fifth condition that is more lenient than the fourth condition, the content of the operation instruction is determined based on the multiple optical signals that satisfy the fifth condition.

13. The second processor When the optical signal is not received by the second optical receiver and the third optical receiver, when there is no optical signal among the optical signals received by the second optical receiver and the third optical receiver whose evaluation value satisfies the fourth condition, and when there are not a plurality of optical signals among the optical signals received by the second optical receiver and the third optical receiver whose evaluation value satisfies the fifth condition, The projection device according to claim 12 , wherein the content of the operation instruction is determined based on the optical signal received by the first optical receiver.

14. The second processor The projection device according to claim 13, wherein the content of the operation instruction is determined based on the optical signal received by the first optical receiver, the evaluation value of which satisfies a sixth condition that is stricter than the fifth condition.

15. a plurality of the first light receivers are provided, The second processor 15. The projection device according to claim 14, wherein, when there are a plurality of optical signals among the optical signals received by the plurality of first optical receivers whose evaluation values ​​satisfy the sixth condition, the content of the operation instruction is determined based on the optical signal whose evaluation value is the largest.

16. The second processor performing control to store in a storage unit history information of the optical receiver that received the optical signal used to determine the content of the operation instruction; The projection device according to claim 9 , wherein the optical signal for determining the content of the operation instruction is identified based on the history information in addition to the evaluation value.

17. a third processor; The third processor Accepting a selection instruction from a user; The projection device according to claim 1 , wherein the optical signal for determining the content of the operation instruction is specified based on the selection instruction.

18. a projection lens unit including an optical system that projects image light onto a projection surface; a first light receiver and a second light receiver provided in the projection lens unit for receiving an optical signal emitted from a remote controller; Equipped with the first optical receiver is disposed at a position where it can receive the optical signal that has passed through at least a part of the optical system; the second optical receiver is disposed at a position where it can receive the optical signal without passing through the optical system; 1. A method of operating a projection device, comprising: deriving an evaluation value relating to the quality of the optical signal received by the first optical receiver and the second optical receiver; and A method for operating a projection device, comprising: determining the content of an operation instruction based on the optical signal received by the second optical receiver, the evaluation value of which satisfies a predetermined first condition.

19. A projection lens unit including an optical system that projects image light onto a projection surface; a first light receiver and a second light receiver provided in the projection lens unit for receiving an optical signal emitted from a remote controller; a first processor; Equipped with the first optical receiver is disposed at a position where it can receive the optical signal that has passed through at least a part of the optical system; the second optical receiver is disposed at a position where it can receive the optical signal without passing through the optical system; The first processor deriving an evaluation value relating to the quality of the optical signals received by the first optical receiver and the second optical receiver; performing control to store in a storage unit history information of the optical receiver that received the optical signal used to determine the content of the operation instruction; identifying the optical signal for determining the content of the operation instruction based on the evaluation value and the history information; Projection device.

20. A projection lens unit including an optical system that projects image light onto a projection surface; a first light receiver and a second light receiver provided in the projection lens unit for receiving an optical signal emitted from a remote controller; Equipped with the first optical receiver is disposed at a position where it can receive the optical signal that has passed through at least a part of the optical system; the second optical receiver is disposed at a position where it can receive the optical signal without passing through the optical system; 1. A method of operating a projection device, comprising: deriving an evaluation value regarding the quality of the optical signal received by the first optical receiver and the second optical receiver; performing control to store in a storage unit history information of the optical receiver that received the optical signal used to determine the content of the operation instruction; and and specifying the optical signal for determining the content of the operation instruction based on the evaluation value and the history information.

21. A projection lens unit including an optical system that projects image light onto a projection surface; a first light receiver and a second light receiver provided in the projection lens unit for receiving an optical signal emitted from a remote controller; a main body portion including an image forming unit in which the projection lens portion is provided and which forms the image light; a third optical receiver provided in the main body portion and configured to receive the optical signal; a second processor; and Equipped with the first optical receiver is disposed at a position where it can receive the optical signal that has passed through at least a part of the optical system; the second optical receiver is disposed at a position where it can receive the optical signal without passing through the optical system; The second processor deriving an evaluation value relating to the quality of the optical signals received by the first optical receiver, the second optical receiver, and the third optical receiver; determining the content of the operation instruction based on the optical signal, of which the evaluation value satisfies a predetermined fourth condition, among the optical signals received by the second optical receiver and the third optical receiver; Projection device.

22. A projection lens unit including an optical system that projects image light onto a projection surface; a first light receiver and a second light receiver provided in the projection lens unit for receiving an optical signal emitted from a remote controller; a main body portion including an image forming unit in which the projection lens portion is provided and which forms the image light; a third optical receiver provided in the main body portion and configured to receive the optical signal; Equipped with the first optical receiver is disposed at a position where it can receive the optical signal that has passed through at least a part of the optical system; the second optical receiver is disposed at a position where it can receive the optical signal without passing through the optical system; 1. A method of operating a projection device, comprising: deriving an evaluation value relating to the quality of the optical signals received by the first optical receiver, the second optical receiver, and the third optical receiver; and A method for operating a projection device, comprising: determining the content of an operation instruction based on the optical signals received by the second optical receiver and the third optical receiver, the evaluation value of which satisfies a predetermined fourth condition.

23. A projection lens unit including an optical system that projects image light onto a projection surface; a first light receiver and a second light receiver provided in the projection lens unit for receiving an optical signal emitted from a remote controller; a main body portion including an image forming unit in which the projection lens portion is provided and which forms the image light; a third optical receiver provided in the main body portion and configured to receive the optical signal; a second processor; and Equipped with the first optical receiver is disposed at a position where it can receive the optical signal that has passed through at least a part of the optical system; the second optical receiver is disposed at a position where it can receive the optical signal without passing through the optical system; The second processor deriving an evaluation value relating to the quality of the optical signals received by the first optical receiver, the second optical receiver, and the third optical receiver; performing control to store in a storage unit history information of the optical receiver that received the optical signal used to determine the content of the operation instruction; identifying the optical signal for determining the content of the operation instruction based on the evaluation value and the history information; Projection device.

24. A projection lens unit including an optical system that projects image light onto a projection surface; a first light receiver and a second light receiver provided in the projection lens unit for receiving an optical signal emitted from a remote controller; a main body portion including an image forming unit in which the projection lens portion is provided and which forms the image light; a third optical receiver provided in the main body portion and configured to receive the optical signal; Equipped with the first optical receiver is disposed at a position where it can receive the optical signal that has passed through at least a part of the optical system; the second optical receiver is disposed at a position where it can receive the optical signal without passing through the optical system; 1. A method of operating a projection device, comprising: deriving an evaluation value regarding the quality of the optical signals received by the first optical receiver, the second optical receiver, and the third optical receiver; performing control to store in a storage unit history information of the optical receiver that received the optical signal used to determine the content of the operation instruction; and and specifying the optical signal for determining the content of the operation instruction based on the evaluation value and the history information.