Projection lens and projection device

Abstract

To provide a projection lens and a projection device that can be remotely operated by a remote controller, for example, even in a usage form in which only a first lens located on the most enlargement side of a magnifying optical system is exposed to the outside.SOLUTION: A projection lens comprises: a third optical system that is a third optical system which projects an image light toward a screen and that includes an emission lens located on most projection surface side; and a light receiver. The light receiver receives an optical signal from a remote controller. The light receiver is attached to a position capable of receiving the optical signal transmitted through the emission lens, specifically, to a holding frame, and more specifically, to a first surface of the holding frame.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a projection lens and a projection device. [Background technology]

[0002] Patent document 1 describes an image projection device that has a light receiving sensor that detects light signals emitted from a remote control, and whose operation and settings are remotely controlled based on the signal detected by the light receiving sensor, and that has a holding member that holds the light receiving sensor and a support part that supports the holding member so that it can rotate around a center line, and the holding member has an outer contour line in a cross section perpendicular to the center line at each position along the center line of the part that is exposed to the outside that has an approximately circular or arc shape. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-102662 Summary of the Invention

[0004] One embodiment of the technology of the present disclosure provides a projection lens and a projection device that can be remotely controlled using a remote controller, even when, for example, only the first lens located on the most magnifying side of the magnifying optical system is exposed to the outside. [Means for solving the problem]

[0005] The projection lens of the present disclosure is a projection lens that projects image light onto a projection surface, and comprises an optical system including a first lens located closest to the projection surface, and a photoreceiver that receives an optical signal from a remote controller, the photoreceiver being positioned at a position where it can receive the optical signal that has passed through the first lens.

[0006] The optical system is preferably a magnifying optical system that magnifies and projects the image light onto the projection surface.

[0007] It is preferable that a holding frame for holding the first lens is provided, and the light receiver is attached to the holding frame.

[0008] The optical system preferably includes a second lens arranged on the opposite side of the projection surface of the first lens and having a lens surface with a smaller radius than the first lens, the holding frame having a first surface facing the end of the first lens, a second surface facing the end of the second lens, and an intermediate surface extending radially and connecting the first surface and the second surface, and the light receiver is attached to at least one of the first surface, the second surface, and the intermediate surface.

[0009] The receiver is preferably mounted on the first surface or the intermediate surface.

[0010] It is preferable that the device has a circuit board on which a control circuit for controlling the operation of the optical receiver is mounted, the optical receiver being arranged on the side of the first surface, the second surface, or the intermediate surface, and the circuit board being arranged on the side of the holding frame opposite the first surface, the second surface, or the intermediate surface.

[0011] When the radius of the lens surface of the first lens is G1 and the radius of the lens surface of the second lens is G2, it is preferable that the value of G1 / G2 is 1.7 or more and the light receiver is attached to the intermediate surface.

[0012] Preferably, the first lens or the second lens has a recess on the surface opposite to the projection surface, and the light receiver is disposed in the recess.

[0013] It is preferable that the first lens or the second lens is made of resin, and the recess is formed by an ejector pin used when the first lens or the second lens is pushed out of the mold.

[0014] Preferably, the first lens has a straight end and a curved end, and the light receiver is disposed at a position facing the straight end.

[0015] It is preferable that a mirror be provided to reflect the image light and make it incident on the optical system, and that the light receiver be attached around the mirror.

[0016] The optical receiver is attached to the surface of the mirror opposite to the reflecting surface, and the mirror is preferably made of a material that transmits optical signals.

[0017] It is preferable that the optical receiver includes a connection portion electrically connected to a projection device having an image forming unit that forms image light, and that the optical receiver transmits an optical signal to the projection device via the connection portion.

[0018] It is preferable that the projection device can be attached to and detached from the projection device by the connecting portion.

[0019] A projection device according to the present disclosure includes any of the projection lenses described above, and an image forming unit that forms image light to be projected onto a projection surface through the projection lens. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a diagram showing a projector equipped with a projection lens. [Figure 2] FIG. 2 is a diagram showing a connection portion between a projection lens and a main body. [Figure 3] FIG. 1 is a diagram showing a usage pattern of a projector. [Figure 4] FIG. 2 is a cross-sectional view of a projection lens. [Figure 5] FIG. 3 is an enlarged cross-sectional view of the vicinity of a third barrel portion of the projection lens. [Figure 6] FIG. 2 is an enlarged cross-sectional view of the vicinity of a first surface of the holding frame. [Figure 7] FIG. 2 is an exploded perspective view of an output lens, a holding frame, a light receiving unit, etc. [Figure 8] FIG. 2 is an exploded perspective view of an output lens, a holding frame, a light receiving unit, etc. [Figure 9] FIG. 2 is an enlarged perspective view of the vicinity of a first surface of the holding frame. [Figure 10] FIG. 2 is a perspective view showing the reduction side surface of the output lens. [Figure 11] FIG. 10 is a diagram showing an example in which a plurality of light receiving units are attached to the first surface. [Figure 12] FIG. 2 is an enlarged cross-sectional view of the vicinity of the intermediate surface of the holding frame. [Figure 13] FIG. 2 is an enlarged perspective view of the vicinity of the intermediate surface of the holding frame. [Figure 14] FIG. 4 is an enlarged cross-sectional view of the vicinity of the second surface of the holding frame. [Figure 15] FIG. 2 is an enlarged perspective view of the vicinity of a second surface of the holding frame. [Figure 16] FIG. 10 is a diagram showing an example in which a light receiving unit is disposed at a position facing a linear end of an output lens. [Figure 17] FIG. 2 is an enlarged cross-sectional view of the vicinity of the second mirror. [Figure 18] 10 is a diagram showing the positional relationship between a second mirror and a light receiving unit. FIG. [Figure 19] FIG. 10 is a diagram showing an example in which a plurality of light receiving units are attached to the rear surface of the second mirror at positions facing each other. DETAILED DESCRIPTION OF THE INVENTION

[0021] 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 or projection lens.

[0022] [First embodiment] 1, a projector 10 includes a projection lens 11, a main body 12, and a remote controller 13. One end of the projection lens 11 is attached to the main body 12. The main body 12 houses main components such as an image forming unit 14 and a control board. The main body 12 is an example of a "projection device" according to the technology of the present disclosure.

[0023] The image forming unit 14 forms image light to be projected onto a screen 21 (see FIG. 3) through a projection lens 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.

[0024] 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 multiple 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.

[0025] An example of the light source 16 is a white light source. The white light source emits white light. For example, the white light source can be realized by combining a laser light source and a phosphor. The laser light source emits blue light as excitation light for the phosphor. The phosphor 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 laser light source and the yellow light emitted from the 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 11 and projected onto the screen 21. The image light of each color is integrated on the screen 21. Therefore, a full-color image P (see FIG. 3) is displayed on the screen 21.

[0026] A light beam representing an image formed by the image forming unit 14 is incident on the projection lens 11 from the main body 12. The projection lens 11 enlarges and forms an image based on the incident light beam. As a result, the projection lens 11 projects an image P, which is an enlarged image of the image formed by the image forming unit 14, from the outermost output lens L35 onto the screen 21.

[0027] The remote controller 13 is an operating member for remotely operating the projector 10, and is battery-powered. The remote controller 13 has a plurality of buttons for issuing operating instructions, such as a power button, a zoom button, and a focus button. The remote controller 13 emits an optical signal OS (see FIG. 6), such as infrared light, in response to a button press by a user U (see FIG. 3). Note that the optical signal OS is not limited to infrared light; it may be visible light.

[0028] As an example, as shown in FIG. 2, the projection lens 11 has a connection portion 17. The connection portion 17 is a so-called mount portion and has a plurality of electrodes (not shown). The main body 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 a plurality of electrodes (not shown). The projection lens 11 is mechanically and electrically connected to the main body 12 (via the electrodes of the connection portion 17 and the connection portion 18) by connecting the connection portion 17 to the connection portion 18 of the main body 12. The projection lens 11 is also detachable from the main body 12 by the connection portion 17. Specifically, the connection portion 17 is fixed to the connection portion 18 by engaging a protrusion (not shown) formed on the connection portion 18 on the projector 10 side with a groove (not shown) formed on the connection portion 17 on the projection lens 11 side and rotating the projection lens 11 clockwise in the circumferential direction. Furthermore, with the connection portion 17 and the connection portion 18 fixed, the projection lens 11 is rotated counterclockwise in the circumferential direction, whereby the connection portion 17 is detached from the connection portion 18.

[0029] As an example, as shown in FIG. 3, projector 10 is used in a form in which it is built into wall 20A of a user U's room, with only output lens L35 of projection lens 11 exposed to the outside. Image light emitted from output lens L35 is projected onto screen 21 installed on wall 20B opposite wall 20A. Screen 21 is an example of a "projection surface" according to the technology of the present disclosure. Note that output lens L35 is covered with a lid or the like when projector 10 is not in use. Projector 10 can also be removed from wall 20A for use.

[0030] As an example, as shown in FIG. 4, the projection lens 11 includes a bending optical system. The bending optical system has a first optical axis A1, a second optical axis A2, and a third optical axis A3. The first optical axis A1 is the optical axis through which light from the main body 12 passes. The second optical axis A2 is bent by 90° relative to the first optical axis A1. The third optical axis A3 is bent by 90° relative 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 does not violate the spirit of the technology of the present disclosure. Furthermore, "parallel" refers to not only a perfect parallel but also a parallel that includes an error that is generally acceptable in the technical field to which the technology of the present disclosure belongs and does not violate the spirit of the technology of the present disclosure. FIG. 4 shows the projection lens 11 with the exterior cover removed.

[0031] 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 and Z directions is referred to as the X direction. Additionally, the side of the screen 21, which is the projection surface, is referred to as the projection surface side or enlargement side, and the side opposite the screen 21 is referred to as the opposite side to the projection surface or reduction side.

[0032] The projection lens 11 has a first barrel 30, a second barrel 31, and a third barrel 32. The first barrel 30 is located farthest from the screen 21, and the third barrel 32 is located closest to the screen 21. The second barrel 31 is located between the first barrel 30 and the third barrel 32. Each of the barrels 30-32 holds a lens. The lens held by the first barrel 30 is arranged on a first optical axis A1, the lens held by the second barrel 31 is arranged on a second optical axis A2, and the lens held by the third barrel 32 is arranged on a third optical axis A3. The central axis of the first barrel 30 substantially coincides with the first optical axis A1, the central axis of the second barrel 31 substantially coincides with the second optical axis A2, and the central axis of the third barrel 32 substantially coincides with the third optical axis A3. In this specification, for the sake of simplicity, multiple lenses may be omitted and expressed as if they were a single lens.

[0033] The first lens barrel 30 holds a first optical system L1. The first optical system L1 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 L1 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 L2, for example, on the reduction side of a first mirror 38 described below. In other words, the intermediate image MI is formed at a position between the lens L16 and the first mirror 38. A fixed aperture 33 is provided between the lenses L13 and L14. The fixed aperture 33 narrows the light beam incident from the main body 12.

[0034] Lenses L11, L12, and L13 are held by a holding frame 34. Lenses L11 and L12 constitute, for example, a zoom lens group, and are movable along the first optical axis A1 by an actuator such as a motor. Lens L14 is held by a holding frame 35. Lens L15 is held by a holding frame 36. Lens L16 is held by a holding frame 37. The holding frame 37 holds the holding frame 36. The holding frame 36 is an inner frame, and the holding frame 37 is an outer frame.

[0035] The lens L15 is a lens that mainly 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 are easier to manufacture using resin than glass, the lens L15 is made of resin such as cycloolefin polymer. Meanwhile, in this example, all of the lenses constituting the first optical system L1 other than the lens L15 are made of glass. Here, the lens surface refers to the surface through which image light passes through the lens. The lens L15 may also be made of glass.

[0036] The second lens barrel 31 holds the second optical system L2. The second optical system L2 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 L2 functions as a relay lens. More specifically, the second optical system L2 uses the intermediate image MI formed by the first optical system L1 as a subject, and relays a light beam representing the intermediate image MI to the third lens barrel 32.

[0037] The second lens barrel 31 integrally holds a first mirror 38 and a second mirror 39. The first mirror 38 and the second mirror 39 are each one of the optical elements that make up a bending optical system, and bend the optical axis. The first mirror 38 bends light along the first optical axis A1 to form light along the second optical axis A2. The second mirror 39 bends light along the second optical axis A2 to form light along the third optical axis A3. The second mirror 39 is an example of a "mirror that reflects image light to enter the optical system" according to the technology of the present disclosure.

[0038] The first mirror 38 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 39 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 38 and the second mirror 39 are specular reflection mirrors made of a transparent material such as glass coated with a reflective film. Note that the first mirror 38 and the second mirror 39 may also be mirrors that use prisms that totally reflect light.

[0039] The third lens barrel 32 holds the third optical system L3. The third optical system L3 is composed of lenses L31, L32, L33, L34, and an output lens L35, and is arranged along the third optical axis A3. The third optical system L3 is an example of an "optical system" and a "magnifying optical system" according to the technology of the present disclosure. The output lens L35 is an example of a "first lens" according to the technology of the present disclosure, and the lens L34 is an example of a "second lens" according to the technology of the present disclosure.

[0040] Lenses L31 and L32 are held by a holding frame 40. Lenses L31 and L32, for example, constitute a focus lens group and are movable along the third optical axis A3 by an actuator such as a motor. Lenses L33 and L34 are held by a holding frame 41. Output lens L35 is held by holding frames 41 and 42. Holding frame 42 holds holding frame 41. Holding frame 41 is an inner frame, and holding frame 42 is an outer frame. Holding frame 41 is an example of a "holding frame that holds a first lens" according to the technology of the present disclosure.

[0041] The lenses L33 and L34 have negative refractive power to enlarge the projected image P and diverge the image light. The output lens L35 is the lens located closest to the enlargement side and outputs the image light toward the screen 21. The output lens L35 has a straight end 45 and a curved end 46 (see FIGS. 11 and 16) and is a D-shaped lens in plan view, with a portion of its outer edge below the third optical axis A3 cut in a straight line (see also FIG. 10). The output lens L35 is an aspherical lens, like the lens L15, and is made of a resin such as a cycloolefin polymer. In contrast, the lenses L33 and L34, located on the reduction side of the output lens L35, are spherical lenses with spherical lens surfaces and are made of glass. The lenses L31 and L32 are also spherical lenses with spherical lens surfaces and are made of glass.

[0042] The half angle of view of the projection lens 11 is, for example, 63° or more, and more preferably 65° or more. To ensure such a wide half angle of view, lenses L33 and L34 need to have 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 makes it possible to widen the angle of view of the projected image P while maintaining a relatively small diameter of the lens surface.

[0043] On the other hand, the output lens L35 in the third optical system L3 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. 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 with 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 projection lenses 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.

[0044] As an example, as shown in Figure 5, if the radius of the lens surface of output lens L35 is G1 and the radius of the lens surface of lens L34 is G2, the value of G1 / G2 is 1.7 or more (G1 / G2 ≥ 1.7). Here, the radius of the lens surface is the distance from the optical axis to the outermost peripheral ray passing through the lens, which is the so-called effective radius. Note that it is preferable that the value of G1 / G2 is 3 or less (G1 / G2 ≤ 3).

[0045] The holding frame 41 has a first surface 50, a second surface 51, a third surface 52, and an intermediate surface 53. These surfaces 50 to 53 all extend radially and are parallel to the XZ plane. The first surface 50 is located at the outermost position in the radial direction of the holding frame 41 among these surfaces 50 to 53 and has an annular sector shape (see FIG. 8). The first surface 50 faces the end RSE_L35 of the reduction-side surface RS_L35 of the output lens L35. The second surface 51 and the third surface 52 have an annular shape (see FIG. 8). The second surface 51 is located one step further back from the first surface 50 and the intermediate surface 53 toward the reduction side. The third surface 52 is located one step further back from the second surface 51 toward the reduction side. The lens L34 is held in a step portion formed between the first surface 50 and the intermediate surface 53 and the second surface 51. Furthermore, the lens L33 is held in a step portion formed between the second surface 51 and the third surface 52. The second surface 51 faces an end RSE_L34 of the reduction-side surface RS_L34 of the lens L34. The third surface 52 faces an end RSE_L33 of the reduction-side surface RS_L33 of the lens L33.

[0046] The intermediate surface 53 has an annular shape (see FIG. 8) and connects the first surface 50 and the second surface 51. A plurality of grooves with a V-shaped cross section are formed in the intermediate surface 53. These grooves allow the intermediate surface 53 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 and does not concentrate locally. Therefore, the generation of stray light can be suppressed.

[0047] As an example, as shown in FIG. 6, a light-receiving unit 60 is attached to the first surface 50. The light-receiving unit 60 includes a light-receiving element 61 and a circuit board 62. The light-receiving element 61 is cylindrical with a rounded tip and receives the optical signal OS from the remote controller 13, which has passed through the output lens L35, using a light-receiving element built into the tip. The circuit board 62 is rectangular and has a control circuit 63 mounted thereon that controls the operation of the light-receiving element 61. A connector 64 (see also FIG. 9) that connects to the light-receiving element 61 is provided in the center of the circuit board 62. The light-receiving element 61 is located at its tip on the first surface 50 side. The circuit board 62 is located on the side opposite the first surface 50, on the back surface 65 of the holding frame 41 that faces the reduction side. Although not shown in the figure, wiring is connected to the circuit board 62 for transmitting the optical signal OS to a processor such as a CPU (Central Processing Unit) in the main body 12. The wiring is connected to the connection unit 17. The optical receiver 61 transmits the optical signal OS to the main body 12 via this wiring and the connection unit 17. Note that while FIG. 6 illustrates the optical receiver 61 receiving the optical signal OS parallel to the Y direction, in reality, the optical receiver 61 can receive the optical signal OS at an incident angle corresponding to a predetermined directivity angle. The same applies to the following FIGS. 12, 14, and 17.

[0048] 7 and 8, as an example, four screw insertion holes 71, through which four screws 70 are inserted, are formed in the holding frame 42. Four screw holes 72 are formed in the surface of the holding frame 41 that faces the holding frame 42, at positions that face 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 42 to the holding frame 41.

[0049] As an example, as shown enlarged in Fig. 9, a through hole 73 is formed in the holding frame 41, penetrating the first surface 50 and the back surface 65. The through hole 73 has a diameter slightly larger than that of the light receiver 61. The light receiver 61 is inserted into the through hole 73. The light receiver 61 is fixed to the through hole 73 with an adhesive or the like.

[0050] As an example, as shown in FIG. 10, an end RSE_L35 of the reduction-side surface RS_L35 of the output lens L35 has a plurality of circular recesses 80. The recesses 80 are formed by ejector pins used when pushing the resin output lens L35 out of the mold. In order to equalize the force applied to the output lens L35 when it is pushed out of the mold, the recesses 80 are provided at positions symmetrical with respect to the third optical axis A3. The tip of the photodetector 61 is disposed in one of the recesses 80, which is located at a position corresponding to the through-hole 73 (see also FIG. 6).

[0051] The end RSE_L35 is provided with a plurality of oval seating surfaces 81. The seating surfaces 81 abut against the first surface 50. In addition, the edge of the output lens L35 is provided with a plurality of fitting protrusions 82 that protrude slightly in the radial direction. The fitting protrusions 82 fit into fitting grooves (not shown) provided in the holding frame 41. The seating surfaces 81 and the fitting protrusions 82 position the output lens L35 relative to the holding frame 41. Note that the end RSE_L35 does not need to have the recess 80. In that case, the light receiver 61 can be positioned by, for example, adjusting the height of the seating surfaces 81 to form a gap for the light receiver 61 between the output lens L35 and the first surface 50.

[0052] Next, the operation of the above configuration will be described. In the projector 10, image light formed in the image forming unit 14 first enters the lens L11 of the first optical system L1 of the projection lens 11 shown in FIG. 4. The image light then passes through lenses L12 and L13, and then through the fixed diaphragm 33, where the amount of light is adjusted. The image light, whose amount has been adjusted by the fixed diaphragm 33, passes through lens L14 and then lens L15. Aberrations of the image light are corrected by the lens L15 and the like.

[0053] The image light that has passed through the lens L15 is incident on the lens L16. Then, an intermediate image MI is formed on the reduction side of the first mirror , that is, at a position between the lens L16 and the first mirror .

[0054] The image light that has passed through the lens L16 is bent by 90 degrees by the first mirror 38 to become light along the second optical axis A2, and passes through the second optical system L2.

[0055] The image light that has passed through the second optical system L2 is bent again by 90 degrees by the second mirror 39 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 L3, and finally passes through the exit lens L35 to be projected onto the screen 21 as the image P.

[0056] When the user U operates the remote controller 13 while pointing it at the output lens L35, the optical signal OS emitted from the remote controller 13 passes through the output lens L35 and is received by the optical receiver 61 of the optical receiving unit 60 attached to the first surface 50 of the holding frame 41. The optical signal OS is output from the optical receiver 61 to a circuit board 62, and is further transmitted from the circuit board 62 to the processor in the main body 12 via wiring and the connection parts 17 and 18.

[0057] The processor performs control in accordance with the optical signal OS. For example, if the optical signal OS is an operation signal related to zooming, the processor moves the lenses L11 and L12 that make up the zoom lens group along the first optical axis A1. If the optical signal OS is an operation signal related to focusing, the processor moves the lenses L31 and L32 that make up the focus lens group along the third optical axis A3.

[0058] As described above, the projection lens 11 is the third optical system L3 that projects image light toward the screen 21, and includes the third optical system L3 including the output lens L35 located closest to the projection surface, and the light receiver 61. The light receiver 61 receives the optical signal OS from the remote controller 13. The light receiver 61 is attached to a position where it can receive the optical signal OS that has passed through the output lens L35, specifically, to the holding frame 41, and more specifically, to the first surface 50 of the holding frame 41. Therefore, even in the usage mode in which only the output lens L35 is exposed to the outside, as illustrated in FIG. 3, remote operation by the remote controller 13 is possible.

[0059] Even in a usage mode in which only the output lens L35 is exposed to the outside, a configuration that enables remote operation by the remote controller 13 may involve attaching the light receiver 61 near the output lens L35 on the exterior cover of the projection lens 11. However, in that case, it is necessary to ensure space in the exterior cover for the light receiver 61, which increases the size of the projection lens 11. Therefore, as with the technology disclosed herein, it is preferable to attach the light receiver 61 in a position where it can receive the optical signal OS that has passed through the output lens L35.

[0060] The third optical system L3 is a magnifying optical system that magnifies and projects the image light toward the screen 21. In the case of a magnifying optical system, the radius of the lens surface of the outermost exit lens L35 is relatively large, so that the optical signal OS can be easily taken into the projection lens 11, and the risk of the remote controller 13 becoming less effective can be reduced.

[0061] The holding frame 41 holds the output lens L35. If the light receiver 61 is attached to this holding frame 41, there are relatively few obstacles that can prevent the light receiver 61 from receiving the optical signal OS, which reduces the risk of the remote controller 13 becoming less effective.

[0062] The first surface 50, on which the light receiver 61 is attached, faces the end RSE_L35 of the output lens L35. The output lens L35 is located on the most magnifying side of the lenses in the third optical system L3. Therefore, by attaching the light receiver 61 to the first surface 50, the output lens L35 is the only obstacle that prevents the light receiver 61 from receiving the optical signal OS, further reducing the risk of the remote controller 13 becoming less effective. Furthermore, the output lens L35 has the largest lens surface diameter of all the lenses in the third optical system L3. To support the output lens L35, the first surface 50 protrudes significantly in the radial direction. Therefore, the first surface 50 can have a relatively large area, ensuring sufficient space for the light receiver 61 to be placed.

[0063] The optical receiver 61 includes a circuit board 62 on which a control circuit 63 for controlling the operation of the optical receiver 61 is mounted. The optical receiver 61 is disposed on the first surface 50 side, and the circuit board 62 is disposed on the back surface 65 side of the holding frame 41 opposite the first surface 50. As described above, the first surface 50 protrudes significantly in the radial direction, and therefore the back surface 65 also protrudes significantly in the radial direction. This allows the circuit board 62 to be disposed on the back surface 65 with ample space. This also makes it easier to route the wiring connected to the circuit board 62.

[0064] The light receiver 61 is disposed in a recess 80 provided on the surface RS_L35 opposite the projection surface of the output lens L35. This allows the light receiver 61, and therefore the light receiving unit 60, to be housed compactly.

[0065] The output lens L35 is made of resin, and the recess 80 is formed by an ejector pin used when pushing the output lens L35 out of a mold. Therefore, the recess 80 that is originally present due to the manufacturing method can be effectively used to accommodate the light receiver 61. Note that the recess 80 does not have to be formed by an ejector pin, and may be newly formed in order to accommodate the light receiver 61.

[0066] The projection lens 11 includes a connection portion 17 that is electrically connected to a main body portion 12 that includes an image forming unit 14 that forms image light. The light receiver 61 transmits an optical signal OS to the main body portion 12 via the connection portion 17. This allows the optical signal OS to be transmitted smoothly from the projection lens 11 to the main body portion 12.

[0067] The projection lens 11 is detachable from the main body 12 by means of a connecting portion 17. Therefore, one projection lens 11 can be shared by a plurality of main bodies 12.

[0068] The number of light receiving units 60 is not limited to one, and multiple light receiving units 60 may be provided. As an example, as shown in FIG. 11, four light receiving units 60 may be provided. Each light receiving unit 60 receives an optical signal OS from the remote controller 13. In this case, it is preferable to provide the light receiving units 60 at positions symmetrical with respect to the third optical axis A3 so that each light receiving unit 60 has an equal probability of receiving the optical signal OS. In FIG. 11, the light receiving units 60 are provided at positions at approximately ±45° with respect to a line parallel to the Z direction passing through the third optical axis A3, and at positions at approximately ±100° with respect to a line parallel to the Z direction passing through the third optical axis A3. By providing multiple light receiving units 60 in this manner, the risk of the remote controller 13 becoming less effective can be further reduced.

[0069] [Second embodiment] In the first embodiment, the light receiver 61 is attached to the first surface 50, but this is not limiting. For example, as in a second embodiment shown in Figures 12 and 13, the light receiver 61 may be attached to the intermediate surface 53.

[0070] 12 and 13, the light receiving unit 60 is attached to the intermediate surface 53. The light receiver 61 has a tip end with a built-in light receiving element for the optical signal OS located on the side of the intermediate surface 53. In contrast, the circuit board 62 is located on the back surface 65 side of the holding frame 41.

[0071] A through hole 90 is formed in the holding frame 41, penetrating the intermediate surface 53 and the back surface 65. The through hole 90 has a diameter slightly larger than that of the light receiver 61. The light receiver 61 is inserted into the through hole 90. The light receiver 61 is fixed to the through hole 90 with an adhesive or the like.

[0072] As described above, in the second embodiment, the light receiver 61 is attached to the intermediate surface 53. The intermediate surface 53 extends in the radial direction and connects the first surface 50 and the second surface 51. Therefore, similar to the first surface 50, the intermediate surface 53 can also have a relatively large area. Therefore, it is possible to ensure sufficient space for arranging the light receiver 61.

[0073] In particular, in this example, if the radius of the lens surface of output lens L35 is G1 and the radius of the lens surface of lens L34 is G2, the value of G1 / G2 is 1.7 or more, and the difference in diameter between output lens L35 and lens L34 is relatively large. This allows the area of ​​intermediate surface 53 to be significantly larger, making it even easier to arrange light receiver 61.

[0074] It should be noted that multiple light receiving units 60 may be attached to the intermediate surface 53. Furthermore, the first embodiment and the second embodiment may be combined and implemented, and light receiving units 60 may be attached to both the first surface 50 and the intermediate surface 53.

[0075] [Third embodiment] For example, a light receiver 61 may be attached to the second surface 51 as in a third embodiment shown in FIGS.

[0076] 14 and 15, the light receiving unit 60 is attached to the second surface 51. The light receiver 61 has a tip end that incorporates a light receiving element for the optical signal OS, located on the side of the second surface 51. In contrast, the circuit board 62 is located on the back surface 65 side of the holding frame 41.

[0077] A through hole 95 is formed in the holding frame 41, penetrating the second surface 51 and the back surface 65. The through hole 95 has a diameter slightly larger than that of the light receiver 61. The light receiver 61 is inserted into the through hole 95. The light receiver 61 is fixed to the through hole 95 with an adhesive or the like.

[0078] In the third embodiment, the lens L34 is made of a resin such as a cycloolefin polymer, like the output lens L35. Therefore, an end RSE_L34 of the reduction-side surface RS_L34 of the lens L34 has a plurality of circular recesses 96 (only one of which is shown in FIG. 14) similar to the recess 80. Like the recess 80, the recess 96 is formed by an ejector pin used when extruding the resin lens L34 from the mold. As shown in FIG. 14, the tip of the photodetector 61 is disposed in one of the recesses 96, which is located at a position corresponding to the through-hole 95.

[0079] Thus, in the third embodiment, the light receiver 61 is attached to the second surface 51. The light receiver 61 attached to the second surface 51 can also receive the optical signal OS from the remote controller 13 without any problems.

[0080] Note that a plurality of light receiving units 60 may be attached to the second surface 51. Furthermore, the first embodiment and the third embodiment may be combined and implemented, with the light receiving units 60 attached to the first surface 50 and the second surface 51. Furthermore, the second embodiment and the third embodiment may be combined and implemented, with the light receiving units 60 attached to the second surface 51 and the intermediate surface 53. Furthermore, the first embodiment, the second embodiment, and the third embodiment may be combined and implemented, with the light receiving units 60 attached to the first surface 50, the second surface 51, and the intermediate surface 53.

[0081] The lens L34 may be made of glass. As in the case of the output lens L35, the end RSE_L34 does not have to have the recess 96. In that case, the light receiver 61 can be disposed by forming a gap between the lens L34 and the second surface 51 that is large enough to accommodate the light receiver 61.

[0082] [Fourth embodiment] 16, the light receiver 61 may be disposed at a position facing the linear end portion 45 of the output lens L35. In this case, it is preferable to dispose the tip of the light receiver 61 in a recess 80 formed in the linear end portion 45. FIG. 16 shows an example in which two light receiving units 60 are disposed at positions symmetrical to the linear end portion 45 with respect to the third optical axis A3.

[0083] In this way, in the fourth embodiment, the light receiver 61 is disposed at a position facing the linear end portion 45 of the output lens L35. The light receiver 61 disposed at a position facing the linear end portion 45 can also receive the optical signal OS from the remote controller 13 without any problems.

[0084] The first to third embodiments may be combined with the fourth embodiment. For example, the light receiving units 60 may be attached to the first surface 50, the second surface 51, and the intermediate surface 53, and may be disposed at positions facing the linear end portions 45.

[0085] [Fifth embodiment] For example, as shown in FIGS. 17 and 18, a light receiver 61 may be attached around the second mirror 39.

[0086] 17 and 18, the optical receiver 61 is attached at a position facing the back surface 106, which is the surface opposite the reflecting surface 105 of the second mirror 39. More specifically, a through hole 108 is formed in a cover 107 that covers the back surface 106 of the second mirror 39. The through hole 108 is formed in a position of the cover 107 that corresponds to the center of the second mirror 39. The through hole 108 has a diameter slightly larger than that of the optical receiver 61. The optical receiver 61 is inserted into the through hole 108. The optical receiver 61 is fixed to the through hole 108 with an adhesive or the like. The optical receiver 61 has a tip that incorporates a light-receiving element for the optical signal OS, which is located on the back surface 106 side (inside the cover 107), and the circuit board 62 is located on the outside of the cover 107.

[0087] The second mirror 39 is made of a material that transmits the optical signal OS. If the optical signal OS is, for example, infrared light, the second mirror 39 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 has passed through the output lens L35 passes through lenses L34, L33, L32, and L31 and further through the second mirror 39, and is received by the optical receiver 61 attached to a position facing the back surface 106 of the second mirror 39.

[0088] As described above, in the fifth embodiment, the photoreceiver 61 is attached around the second mirror 39, more specifically, at a position facing the rear surface 106 of the second mirror 39. The photoreceiver 61 attached around the second mirror 39 can also receive the optical signal OS from the remote controller 13 without any problems.

[0089] The optical receiver 61 is attached to a position facing the back surface 106 of the second mirror 39, opposite the reflective surface 105. The second mirror 39 is made of a material that transmits the optical signal OS from the remote controller 13. Therefore, the optical signal OS can be received without any problems.

[0090] 19, a plurality of light receiving units 60 may be attached at positions facing each other on the rear surface 106. In this case, it is preferable to arrange the light receiving units 60 at symmetrical positions, as in the case of FIG.

[0091] The "surroundings" of the second mirror 39 include not only the position facing the back surface 106 described above, but also a range within, for example, 1 cm from the top, bottom, left, and right sides of the second mirror 39. For this reason, although not shown in the drawings, the light-receiving unit 60 may be disposed around the second mirror 39 other than the position facing the back surface 106 of the second mirror 39, such as a position several mm away from the top, bottom, left, and right sides of the second mirror 39.

[0092] The first to fourth embodiments may be combined with the fifth embodiment. For example, light-receiving units 60 may be attached to the first surface 50, the second surface 51, and the intermediate surface 53, and may be disposed opposite the linear end portion 45 of the output lens L35. Further, light-receiving units 60 may be attached around the second mirror 39.

[0093] Furthermore, the light receiving unit 60 may be attached to the third surface 52. The light receiving unit 60 may also be attached to the periphery of the first mirror .

[0094] Although the above example illustrates a substantially Z-shaped bending optical system 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 L1 and the second optical system L2 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 a substantially L-shaped bending optical system may be configured having the integrated optical axis and the third optical axis A3.

[0095] Although the third optical system L3 is an enlarging optical system, the optical system is not limited to this and may be a reducing optical system.

[0096] 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) element may be used.

[0097] In the first embodiment, an example has been described in which a laser light source is used as the light source 16, but this is not limiting, and a mercury lamp, an LED, or the like may also be used as the light source 16. In addition, in the first embodiment, a blue laser light source and a yellow phosphor are used, but this is not limiting, and a green phosphor and a red phosphor may be used instead of the yellow phosphor. In addition, a green laser light source and a red laser light source may be used instead of the yellow phosphor.

[0098] The technology of the present disclosure can be appropriately combined with the various embodiments and modifications described above. Furthermore, it goes without saying 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.

[0099] 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.

[0100] 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. [Explanation of symbols]

[0101] 10 Projector 11 Projection lens 12 Main body 13 Remote Controller 14 Image forming unit 15 Image forming panel 16 light source 17, 18 Connection 20A, 20B walls 21 screens 30 First lens barrel 31 Second lens barrel 32 Third telescope tube 33 Fixed Aperture 34~37, 40~42 Retaining frame 38 1st Mirror 39 Second Mirror 45 Straight end 46 curved end 50 Page 1 51 Side 2 52 Page 3 53 Intermediate Surface 60 Light receiving unit 61 Receiver 62 Circuit Board 63 Control circuit 64 connectors 65 Back of the holding frame 70 screws 71 Screw insertion hole 72 screw holes 73, 90, 95, 108 through holes 80, 96 recess 81 Seat 82 Fitting protrusion 105 Reflective surface of second mirror 106 Back of the second mirror 107 Cover A1 1st optical axis A2 2nd optical axis A3 3rd optical axis G1 radius G2 radius L1 1st optical system L2 2nd optical system L3 Third optical system L11, L12, L13, L14, L15, L16, L21, L22, L31, L32, L33, L34 lenses L35 output lens MI intermediate image OS Optical Signal P Image RS_L33, RS_L34 Lens reduction side RS_L35 Output lens reduction surface Edge of the reduction side of the RSE_L33 and RSE_L34 lenses RSE_L35 End of the reduction side of the output lens U User

Claims

1. A projection lens that projects image light onto a projection surface, an optical system including a first lens located closest to the projection surface and a second lens located on the opposite side of the first lens from the projection surface; a light receiver that receives an optical signal from a remote controller, the light receiver being disposed at a position where it can receive the optical signal that has passed through the first lens; a holding frame that holds the first lens, a first surface facing an end of the first lens; a second surface facing the end of the second lens; a holding frame extending in a radial direction and having an intermediate surface connecting the first surface and the second surface; Equipped with the optical receiver is attached to at least one of the first surface, the second surface, and the intermediate surface; Projection lens.

2. A projection lens that projects image light onto a projection surface, an optical system including a first lens located closest to the projection surface; a light receiver that receives an optical signal from a remote controller, the light receiver being disposed at a position where it can receive the optical signal that has passed through the first lens; a connection portion electrically connected to a projection device including an image forming unit that forms the image light; Equipped with the optical receiver transmits the optical signal to the projection device via the connection portion; Projection lens.

3. 2. The projection lens according to claim 1, wherein the optical system is a magnifying optical system that magnifies and projects the image light toward the projection surface.

4. A projection lens as described in Claim 2, wherein the optical system is a magnifying optical system that magnifies and projects the image light toward the projection surface.

5. A projection lens as described in claim 2 or claim 4, which can be attached and detached to the projection device by the connection part.

6. 4. The projection lens according to claim 1, wherein the second lens has a smaller radius of the lens surface than the first lens.

7. 7. The projection lens according to claim 1, wherein the light receiver is attached to the first surface or the intermediate surface.

8. a circuit board on which a control circuit for controlling the operation of the optical receiver is mounted; the light receiver is disposed on the side of the first surface, the second surface, or the intermediate surface; 8. The projection lens according to claim 1, wherein the circuit board is disposed on a side of the holding frame opposite the first surface, the second surface, or the intermediate surface.

9. When the radius of the lens surface of the first lens is G1 and the radius of the lens surface of the second lens is G2, the value of G1 / G2 is 1.7 or more, 9. The projection lens according to claim 1, wherein the light receiver is attached to the intermediate surface.

10. the first lens or the second lens has a recess on a surface opposite to the projection surface, 10. The projection lens according to claim 1, wherein the light receiver is disposed in the recess.

11. the first lens has a straight end and a curved end; 11. The projection lens according to claim 1, wherein the light receiver is disposed at a position facing the linear end portion.

12. a mirror that reflects the image light and makes it incident on the optical system; 12. The projection lens according to claim 1, wherein the light receiver is attached to the periphery of the mirror.

13. the light receiver is attached at a position facing the surface of the mirror opposite to the reflective surface, 13. The projection lens according to claim 12, wherein the mirror is made of a material that transmits the optical signal.

14. A projection lens according to any one of claims 1 to 13; an image forming unit that forms the image light to be projected onto the projection surface through the projection lens; A projection device comprising:

Images