JP2014035513A - Light receiving device and image projection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light receiving device and an image projection apparatus that are able to prevent erroneous operation resulting from disturbance light, while ensuring wide directivity with respect to an optical signal.SOLUTION: A light receiving device comprises: a photoelectric conversion element (light receiving element) 91 configured to receive an optical signal and convert it into an electric signal; and a light transmission member 90 held so that an optical signal received by the photoelectric conversion element 91 is passed through it. A light transmission member 90 has a projecting portion 90a projecting opposite with respect to the photoelectric conversion element 91. The projecting portion 90a has a first inclined surface (upper inclined face), which is inclined at an angle for reflecting the optical signal of light to be received, which enters the projecting portion 90a from a direction intersecting a light receiving axis La that has the maximum light reception sensitivity of the photoelectric conversion element 91, toward the photoelectric conversion element 91.

Description

  The present invention relates to a light receiving device that receives an optical signal and an image projection device including the light receiving device.

  2. Description of the Related Art Conventionally, as an image projecting device that projects and displays an image on a projection surface such as a screen, a light receiving device that receives an optical signal emitted from a remote control device is provided, and can be controlled based on the optical signal received by the light receiving device. Things are known. A light receiving element (photoelectric conversion element) used in this type of light receiving device generally has a directivity angle of about 50 ° to 70 ° (an angle at which the relative sensitivity of the light receiving element is half of the maximum value).

  In Patent Document 1, in order to expand the directivity angle (angle range in which an optical signal can be received), a light collector in which the surface on the remote control device (remote control) side is convex and the back surface on the light receiving unit side is concave. A remote-control light-receiving device having a wide directivity in which an optical part is arranged in the vicinity of a light-receiving part is described.

  However, when a light condensing member having a convex surface on the side of the remote control device is provided as in the remote control light receiving device of Patent Document 1, optical signals from a wide directional direction such as up, down, left, and right are uniformly received. For this reason, the light receiving device may malfunction due to flickering of ambient light emitted from an indoor lamp such as an inverter fluorescent lamp.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a light receiving device capable of preventing a malfunction due to ambient light while ensuring wide directivity with respect to an optical signal, and an image including the light receiving device. It is to provide a projection device.

  In order to achieve the above-mentioned object, the invention of claim 1 includes a photoelectric conversion element that receives an optical signal and converts it into an electrical signal, and a light transmission member that is held so that the optical signal received by the photoelectric conversion element passes therethrough. The light transmission member has a protrusion protruding to the opposite side to the photoelectric conversion element side, and the protrusion has a maximum light receiving sensitivity of the photoelectric conversion element. It has the 1st inclined surface which inclines with the angle which reflects the optical signal of the light-receiving object which entered into the inside of the projection from the direction which intersects the axis toward the photoelectric conversion element. .

  According to the present invention, the light transmission member that is held so that an optical signal received by the photoelectric conversion element passes has a protruding portion that protrudes on the side opposite to the photoelectric conversion element side. The photoelectric conversion element can receive the light signal of the light receiving target that has passed through the inside of the protrusion and is incident on the first inclined surface by the first inclined surface of the protrusion. Directivity can be secured. And the 1st inclined surface of a projection part inclines so that the said optical signal of the said light reception object may be reflected toward a photoelectric conversion element. For this reason, the light that is opposite to the light signal to be received, that is, the light incident on the first inclined surface from the outside is reflected in the direction away from the photoelectric conversion element. Thereby, even if disturbance light is incident on the first inclined surface of the protrusion from the outside, the disturbance light is not received by the photoelectric conversion element, so that malfunction due to the disturbance light can be prevented.

1 is an external perspective view showing a projector and a projection surface according to an embodiment of the present invention. FIG. 2A is a perspective view of the inside of the projector as viewed from the front side of FIG. FIG. 2B is a perspective view of the inside of the projector viewed from the back side of FIG. Explanatory drawing which shows the optical path from a projector to a projection surface. The perspective view of the optical engine part and light source part which were provided in the inside of a projector. The perspective view of a light source part. The exploded perspective view of a light source part. The perspective view of an illumination part. The perspective view which looked at the illumination part, the projection lens part, and the light modulation part from the A direction of FIG. Explanatory drawing which shows the optical path in an illumination part. The perspective view of a light modulation part. The perspective view which shows a 1st projection optical system with an illumination part and a light modulation part. AA sectional drawing of FIG. The perspective view which shows the 2nd optical system which a 2nd projection optical system hold | maintains with a projection lens part, an illumination part, and a light modulation part. The perspective view which shows a 2nd projection optical system with a 1st projection optical system, an illumination part, and a light modulation part. The perspective view which shows the optical path from a 1st optical system to a projection surface. The schematic diagram which showed the arrangement | positioning relationship of each part in an apparatus. Explanatory drawing which shows a mode that the projector is suspended and used from a ceiling. The perspective view of a projector when hanging and using from a ceiling. The partial cross section side view which shows the structural example of the light-receiving device provided in the projector. Explanatory drawing which shows an example of the light-receiving optical path in a light-receiving device. Explanatory drawing which shows an example of the optical path of the disturbance light in a light-receiving device. Explanatory drawing which shows the other example of the light-receiving optical path in a light-receiving device. The front view of the projection part and light receiving element of a light-receiving device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the overall configuration of an image projection apparatus to which the light receiving device according to the present invention can be applied will be described.
FIG. 1 is an external perspective view showing a projector 1 as an image projection apparatus and a projection surface 2 such as a screen according to an embodiment of the present invention. In the following description, as shown in FIG. 1, the normal direction of the projection plane 2 is the X direction, the minor axis direction (vertical direction) of the projection plane is the Y direction, and the major axis direction (horizontal direction) of the projection plane 2 is. Let it be the Z direction.

  The projector is a device that forms a projection image based on image data input from a personal computer, a video camera, or the like, and projects and displays the projection image P on a projection surface 2 such as a screen. In particular, liquid crystal projectors have recently been improved in terms of high resolution and low price due to high resolution of liquid crystal panels, high efficiency of light sources (lamps), and the like. In addition, small and light projectors 1 using DMD (Digital Micro-mirror Device), which is a micro-drive mirror device, have become widespread, and projectors 1 are widely used not only in offices and schools but also at home. . Front-type projectors have improved portability and are now being used for small meetings of several people. Such a projector is required to be able to project an image on a large screen (enlarge the projection screen) and to make the “projection space required outside the projector” as small as possible. As will be described later, in the projector 1 according to the present embodiment, a transmission optical system such as a projection lens is set in parallel with the projection surface 2, the light beam is turned back by a folding mirror, and then the light beam is projected to the projection surface 2 by a free-form curved mirror. And is configured to enlarge and project. With this configuration, it is possible to reduce the size of the optical engine unit in a vertical three-dimensional manner.

  On the upper surface of the projector 1, a transmissive glass 51 from which the light flux of the projection image P is emitted is provided, and the light flux that has passed through the transmissive glass 51 is projected onto the projection surface 2. An operation unit 83 for the user to operate the projector 1 is provided on the upper surface of the projector 1. A focus lever 33 for adjusting the focus is provided on the side surface of the projector 1.

  A light receiving window 1B, which is an opening through which an optical signal from a remote control device that is a remote control device can pass, is formed on the outer plate 1A that constitutes a part of the main casing of the projector 1. The light receiving window 1B is provided with a light transmitting member 90 of a light receiving device that receives an optical signal from a remote control device that is a remote control device. The configuration of this light receiving device will be described in detail later.

FIG. 2 is an internal perspective view of the inside of the projector 1 with the main body cover removed. 2A is a perspective view of the inside of the projector 1 viewed from the front side of FIG. 1, and FIG. 2B is a perspective view of the inside of the projector 1 viewed from the back side of FIG. FIG. 3 is an optical path diagram from the projector 1 to the projection plane 2.
The projector 1 includes an optical engine unit 100 and a light source unit 60 having a light source that emits white light. The optical engine unit 100 includes an image forming unit 101 as an image forming unit that forms an image using light from a light source, and a projection optical unit for projecting a light beam of an image formed by the image forming unit 101 onto the projection surface 2. 102.

  The image forming unit 101 folds the light from the light source 10 having a DMD 12 that is a micro-drive mirror device having a large number of micro mirrors that can be driven so as to change the tilt of the reflecting surface, and irradiates the DMD 12 with light. The illumination unit 20 is used. The projection optical unit 102 includes a first projection optical system 30 including a coaxial optical system 70 including at least one transmissive refractive optical system and having a positive power, a folding mirror 41, and a curved surface having a positive power. The second projection optical system 40 having a mirror 42 is used.

  The DMD 12 emits light from the light source by the illumination unit 20 and modulates the light emitted by the illumination unit 20 to generate an image. The optical image generated by the DMD 12 is projected onto the projection surface 2 via the optical system 70 of the first projection optical system 30, the folding mirror 41 and the curved mirror 42 of the second projection optical system 40.

FIG. 4 is a perspective view of the optical engine unit 100 and the light source unit 60 provided in the projector 1.
As shown in FIG. 4, the light modulation unit 10, the illumination unit 20, the first projection optical system 30, and the second projection optical system 40 that constitute the optical engine unit 100 are images of the projection plane 2 and the projection image P. Of the directions parallel to the surface, they are arranged side by side in the Y direction in the figure. A light source unit 60 is disposed on the right side of the illumination unit 20 in the drawing. Note that reference numerals 32a1 and 32a2 shown in FIG. 4 are legs of the lens holder 32 of the first projection optical system 30, and reference numeral 262 is a screwing portion for screwing the light modulation unit 10 to the illumination unit 20. is there.

FIG. 5 is a perspective view of the light source unit 60. FIG. 6 is an exploded perspective view of the light source unit 60.
The light source unit 60 includes a light source bracket 62 that is a holding member that holds the light source 61, and a light source 61 such as a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is mounted on the light source bracket 62. Further, the light source bracket 62 is provided with a connector portion 62a for connecting to a power supply side connector (not shown) connected to the power supply portion 80 (see FIG. 16).

  A holder 64 holding a reflector 67 and the like is screwed to the light emitting side of the light source 61 above the light source bracket 62. An exit window 63 is provided on the surface of the holder 64 opposite to the light source 61 arrangement side. The light emitted from the light source 61 is condensed on the emission window by the reflector 67 held by the holder and is emitted from the emission window 63.

  Further, light source positioning portions 64a1 to 64a3 are provided on the upper surface of the holder 64 and both ends in the X direction of the lower surface of the holder to position the light source portion 60 on the illumination bracket 26 (see FIGS. 7 and 8) of the illumination portion 20. Yes. The light source positioning portion 64a3 provided on the upper surface of the holder 64 has a protruding shape, and the two light source positioning portions 64a1 and 64a2 provided on the lower surface of the holder 64 have a hole shape.

  Further, a light source air inlet 64b through which air for cooling the light source 61 flows is provided on the side surface excluding the upper surface of the holder 64. Air heated by the heat of the light source 61 is provided on the upper surface of the holder 64. Is provided with a light source exhaust port 64c through which air is exhausted.

  The light source bracket 62 is provided with an airflow passage portion (duct portion) 65 through which air sucked from an intake blower (not shown) passes. The cross section through which the air of the airflow passage 65 passes is substantially rectangular, and the end of the airflow passage 65 is a wall surface. The thickness of the wall surface of the airflow passage portion 65 is substantially constant, and when viewed from the side not used as the airflow passage portion 65, it is shaped like a substantially rectangular parallelepiped protrusion. A surface of the light source bracket 62 opposite to the surface on which the light source 61 is held has a substantially rectangular parallelepiped convex portion along the shape of the airflow passage portion 65 as shown in FIG. The convex portion can be used as a handle portion 68 for picking up the light source portion 60 by picking it with a finger when the light source portion 60 is replaced. Therefore, the outer wall itself of the airflow passage portion 65 has the shape of the handle portion 68. However, in order to use the passage portion 65 as a handle, the outer wall itself of the passage portion 65 does not have to be exactly the shape of the handle, and there may be an appropriate change in shape so that a person can pick it with a fingertip. . Further, in order to allow a part of the air flowing into the airflow passage portion 65 to flow between the light source portion 60 and the opening / closing cover 54 (see FIG. 21) on the air inflow side on the near side of the airflow passage portion 65 in the drawing. The opening 65a is provided.

  Further, the flat surface portion 64d2 provided with the light source positioning protrusion 64a3 and the flat surface portion 64d1 provided with the light source positioning holes 64a1 and 64a2 shown in FIG. It is an abutting part which abuts against the lighting bracket.

FIG. 7 is a perspective view of the illumination unit 20 showing the optical system components housed in the illumination unit 20 together with other components.
As shown in FIG. 7, the illumination unit 20 includes a color wheel 21, a light tunnel 22, two relay lenses 23, a cylinder mirror 24, and a concave mirror 25, which are held by an illumination bracket 26. Yes. The illumination bracket 26 has a housing-like portion 261 in which the two relay lenses 23, the cylinder mirror 24, and the concave mirror 25 are accommodated. Of the four side portions of the housing-like portion 261, Only the right side in the figure has a side surface, and the other three surfaces are open. An OFF light plate 27 (see FIG. 8) is attached to the side opening on the far side in the X direction in the figure, and the side opening on the near side in the X direction in the figure is shown in any drawing. An uncovered cover member is attached. Thus, the two relay lenses 23, the cylinder mirror 24, and the concave mirror 25 housed in the housing-like portion 261 of the illumination bracket 26 are illustrated in the illumination bracket 26, the OFF light plate 27, and any drawing. The cover member is not covered.

  Further, an irradiation through-hole 26d for exposing the DMD 12 is provided on the lower surface of the housing-like portion 261 of the illumination bracket 26.

  The lighting bracket 26 has three leg portions 29. These legs 29 are in contact with the base member 53 (see FIG. 21) of the projector 1 and support the weight of the first projection optical system 30 and the second projection optical system 40 that are stacked and fixed on the illumination bracket 26. Yes. Further, by providing the leg portion 29, a space for the outside air to flow into is formed in the heat sink 13 (see FIG. 8) as a cooling means for cooling the DMD 12 of the light modulation portion 10.

  Reference numerals 32a3 and 32a4 shown in FIG. 7 are legs of the lens holder 32 of the first projection optical system 30, and reference numeral 45a3 is a screwing portion 45a3 of the second projection optical system 40.

FIG. 8 is a perspective view of the illumination unit 20, the projection lens unit 31, and the light modulation unit 10 as viewed from the direction A in FIG.
An upper surface 26b orthogonal to the Y direction in the figure is provided on the upper portion of the housing-like portion 261 of the illumination bracket 26. The four corners of the upper surface 26b are provided with through holes through which screws for screwing the first projection optical system 30 pass (the through holes 26c1 and 26c2 are shown in FIG. The through hole is not shown). Further, positioning holes 26e1 and 26e2 for positioning the first projection optical system 30 in the illumination unit 20 are provided adjacent to the through holes 26c1 and 26c2 on the near side in the X direction in the drawing. Of the two positioning holes provided on the near side in the X direction in the figure, the positioning hole 26e1 on the color wheel 21 arrangement side is a main reference for positioning and has a round hole shape. The positioning hole 26e2 on the opposite side is a positioning secondary reference and is a long hole extending in the Z direction. Further, the periphery of each of the through holes 26c1 and 26c2 protrudes from the upper surface 26b of the illumination bracket 26, and serves as a positioning projection 26f for positioning the first projection optical system 30 in the Y direction. When the positional accuracy in the Y direction is increased without providing the positioning protrusions 26f, it is necessary to increase the flatness of the entire upper surface of the illumination bracket 26, which increases the cost. On the other hand, by providing the positioning projection 26f, it is only necessary to increase the flatness of only the portion of the positioning projection 26f. Therefore, the cost can be reduced and the positional accuracy in the Y direction can be increased.

  In addition, a light shielding plate 262 into which the lower portion of the projection lens unit 31 is fitted is provided in the opening on the upper surface of the illumination bracket 26 to prevent light from entering the housing-like portion 261 from above.

  Further, as will be described later, the second projection optical system 40 is notched between the through holes 26c1 and 26c2 on the upper surface 26b of the illumination bracket 26 so as not to interfere with the screwing of the second projection optical system 40 to the first projection optical system 30. ing.

  A protruding light source positioning portion 64a3 (see FIG. 5) provided on the upper surface of the holder 64 of the light source portion 60 is fitted to the end portion of the illumination bracket 26 on the color wheel 21 side (the front side in the Z direction in the drawing). A cylindrical light source positioned portion 26a3 having a through hole formed in the vertical direction is provided. Further, below the light source positioned portion 26a3, two protruding light source positioned portions 26a1 into which two hole-shaped light source positioning portions 64a1 and 64a2 provided on the light source bracket 62 side of the holder 64 are fitted. 26a2 are provided. Then, the three light source positioning portions 64a1 to 64a3 of the holder 64 are fitted into the three light source positioned portions 26a1 to 26a3 provided on the illumination bracket 26 of the illumination unit 20, so that the light source unit 60 is provided with the illumination unit. Positioned and fixed to 20 (see FIG. 4).

  An illumination cover 28 is attached to the illumination bracket 26 so as to cover the color wheel 21 and the light tunnel 22.

FIG. 9 is an explanatory diagram showing an optical path L in the illumination unit 20.
The color wheel 21 has a disk shape and is fixed to the motor shaft of the color motor 21a. The color wheel 21 is provided with filters such as R (red), G (green), and B (blue) in the rotation direction. Light collected by a reflector (not shown) provided in the holder 64 of the light source unit 60 passes through the emission window 63 and reaches the peripheral end of the color wheel 21. The light that reaches the peripheral end of the color wheel 21 is separated into R, G, and B light in a time-sharing manner by the rotation of the color wheel 21.

  The light separated by the color wheel 21 enters the light tunnel 22. The light tunnel 22 has a rectangular tube shape, and the inner peripheral surface thereof is a mirror surface. The light that has entered the light tunnel 22 is reflected by the inner peripheral surface of the light tunnel 22 a plurality of times, is converted into a uniform surface light source, and is emitted toward the relay lens 23.

  The light passing through the light tunnel 22 passes through the two relay lenses 23, is reflected by the cylinder mirror 24 and the concave mirror 25, and is focused on the image generation surface of the DMD 12 to form an image.

FIG. 10 is a perspective view of the light modulation unit 10.
As shown in FIG. 10, the light modulator 10 includes a DMD board 11 on which a DMD 12 is mounted. The DMD 12 is mounted on a socket 11 a provided on the DMD board 11 with an image generation surface on which micromirrors are arranged in a lattice shape facing upward. The DMD board 11 is provided with a drive circuit for driving the DMD mirror. A heat sink 13 as a cooling means for cooling the DMD 12 is fixed to the back surface of the DMD board 11 (the surface opposite to the surface on which the socket 11a is provided). A portion of the DMD board 11 where the DMD 12 is mounted passes through a through hole (not shown). The heat sink 13 is formed with a protrusion 13a (see FIG. 9) to be inserted into the through hole. The tip of the protrusion 13a is planar. The protrusion 13a is inserted into a through hole (not shown), and the flat surface at the tip of the protrusion 13a is brought into contact with the back surface (the surface opposite to the image generation surface) of the DMD 12. A heat transfer sheet that can be elastically deformed is affixed to the flat portion or the place where the heat sink 13 on the back surface of the DMD 12 abuts to improve the adhesion between the flat portion of the protrusion 13a and the back surface of the DMD 12, thereby increasing the thermal conductivity. May be.

  The heat sink 13 is pressed and fixed to the surface opposite to the surface on which the socket 11a of the DMD board 11 is provided by the fixing member 14. The fixing member 14 has a plate-like fixing portion 14a facing the right side portion of the rear surface of the DMD board 11 in the drawing and a plate-like fixing portion 14a facing the left portion of the rear surface of the DMD board 11 in the drawing. doing. A pressing portion 14b provided to connect the left and right fixing portions is provided near one end and the other end in the X direction of each fixing portion.

  When the light modulator 10 is screwed to the illumination bracket 26 (see FIG. 8), the heat sink 13 is pressed and fixed to the surface opposite to the surface on which the socket 11a of the DMD board 11 is provided by the fixing member 14. The

  Below, fixation of the illumination bracket 26 of the light modulation part 10 is demonstrated. First, the light modulation unit 10 is positioned on the illumination bracket 26 so that the DMD 12 faces the opening surface of the irradiation through hole 26d provided on the lower surface of the illumination bracket 26 of the illumination unit 20 shown in FIG. Next, a screw is inserted from the lower side in the drawing so as to pass through a through hole (not shown) provided in the fixing portion 14 a and the through hole 15 of the DMD board 11, and the screw is provided in the lighting bracket 26. The light modulator 10 is fixed to the illumination bracket 26 by screwing into a screw hole provided on the lower surface of the stopper 262 (see FIG. 4). Further, when a screw is screwed into a screwing portion 262 provided on the illumination bracket 26, the pressing portion 14b presses the heat sink 13 on the DMD board side. Thereby, the heat sink 13 is pressed and fixed by the fixing member 14 to the surface opposite to the surface on which the socket 11a of the DMD board 11 is provided.

  As described above, the light modulation unit 10 is fixed to the illumination bracket 26, and the three legs 29 shown in FIG. 7 also support the weight of the light modulation unit 10.

  A plurality of movable micromirrors are arranged in a lattice pattern on the image generation surface of the DMD 12. Each micromirror can tilt the mirror surface by a predetermined angle around the twist axis, and can have two states of “ON” and “OFF”. When the micromirror is “ON”, the light from the light source 61 is reflected toward the first optical system 70 (see FIG. 3) as indicated by the arrow L2 in FIG. When it is “OFF”, the light from the light source 61 is reflected toward the OFF light plate 27 held on the side surface of the illumination bracket 26 shown in FIG. 8 (see arrow L1 in FIG. 9). Therefore, by driving each mirror individually, light projection can be controlled for each pixel of the image data, and an image can be generated.

  The light reflected toward the OFF light plate 27 (not shown) is absorbed as heat and cooled by the flow of outside air.

FIG. 11 is a perspective view showing the first projection optical system 30 together with the illumination unit 20 and the light modulation unit 10.
As shown in FIG. 11, the first projection optical system 30 is disposed above the illumination unit 20, and the projection lens unit 31 holds a first optical system 70 (see FIG. 3) composed of a plurality of lenses. And a lens holder 32 for holding the projection lens unit 31. The lens holder 32 is provided with four leg portions 32a1 to 32a4 extending downward (only the leg portions 32a2 and 32a3 are shown in FIG. 11. The leg portion 32a1 is shown in FIG. 4 and the leg portion 32a4. 7), screw holes for being screwed to the illumination bracket 26 are formed on the bottom surfaces of the leg portions 32a1 to 32a4.

  The projection lens unit 31 is provided with a focus gear 36, and the idler gear 35 is engaged with the focus gear 36. A lever gear 34 meshes with the idler gear 35, and a focus lever 33 is fixed to the rotation shaft of the lever gear 34. The tip portion of the focus lever 33 is exposed from the apparatus main body as shown in FIG.

  When the focus lever 33 is moved, the focus gear 36 is rotated via the lever gear 34 and the idler gear 35. When the focus gear 36 rotates, a plurality of lenses constituting the first optical system 70 in the projection lens unit 31 move in predetermined directions, and the focus of the projection image is adjusted.

  Further, the lens holder 32 has screw through holes 32c1 to 32c3 through which screws 48 for screwing the second projection optical system 40 to the first projection optical system 30 pass (four in FIG. 11). Three screw through holes are shown, and each screw through hole 32c1 to 32c3 shows a state in which the screw 48 is penetrated. It is the tip side.) In addition, second projection optical system positioning protrusions 32d1 to 32d3 protruding from the surface of the lens holder 32 are formed around the screw through holes 32c1 to 32c4 (32d1 to 32d3 are shown in FIG. 11). .

12 is a cross-sectional view taken along the line AA in FIG.
As shown in FIG. 12, positioning protrusions 32b1 and 32b2 are provided on the leg portions 32a1 and 32a2. The right-side positioning protrusion 32b1 in the drawing is a round hole-shaped positioning hole 26e1 that is the main reference for positioning provided on the upper surface 26b of the illumination bracket 26, and the left-side positioning protrusion 32b2 in FIG. Positioning in the Z-axis direction and the X-axis direction is performed by inserting the reference holes into the long hole-shaped positioning holes 26e2, respectively. Then, screws 37 are inserted into the through holes 26c1 to 26c4 provided on the upper surface 26b of the lighting bracket 26, and the screws 37 are screwed into the screw holes provided in the respective leg portions 32a1 to 32a4 of the lens holder 32. One projection optical system 30 is positioned and fixed to the illumination unit 20.

  The upper side of the projection lens unit 31 with respect to the lens holder 32 is covered with a mirror holder 45 (see FIG. 14) of the second projection optical system described later. As shown in FIG. 4, the portion between the lens holder 32 on the lower side of the lens holder 32 of the projection lens unit 31 and the upper surface 26b of the illumination bracket 26 of the illumination unit 20 is exposed. Since the projection lens unit 31 is fitted with the lens holder 32, light does not enter the optical path of the image from the exposed portion.

  FIG. 13 is a perspective view showing the second optical system included in the second projection optical system 40 together with the projection lens unit 31, the illumination unit 20, and the light modulation unit 10. As shown in FIG. 13, the second projection optical system 40 includes a folding mirror 41 and a concave curved mirror 42 that constitute the second optical system. The surface of the curved mirror 42 that reflects the light can be a spherical surface, a rotationally symmetric aspherical surface, a free curved surface shape, or the like.

  FIG. 14 is a perspective view showing the second projection optical system 40 together with the first projection optical system 30, the illumination unit 20, and the light modulation unit 10. As shown in FIG. 14, the second projection optical system 40 also includes a transmission glass 51 for transmitting the light image reflected from the curved mirror 42 and protecting the optical system components in the apparatus.

  The second projection optical system 40 includes a mirror bracket 43 that holds the folding mirror 41 and the transmission glass 51, a free mirror bracket 44 that holds the curved mirror 42, and a mirror holder 45 to which the mirror bracket 43 and the free mirror bracket 44 are attached. And have.

  The mirror holder 45 has a box shape, and has an upper surface, a lower surface, and a back side in the X direction in the drawing, and has a substantially U-shape when viewed from above. Edges extending in the X direction on the Z direction front side and the back side of the upper opening of the mirror holder 45 are inclined so as to rise from the X direction front side end portion to the X direction back side in the drawing. Part and a parallel part parallel to the X direction in the figure, and the inclined part is on the near side in the X direction in the figure from the parallel part. Further, the edge of the upper opening of the mirror holder 45 extending in the Z direction on the near side in the X direction in the drawing is parallel to the Z direction in the drawing.

  The mirror bracket 43 is attached to the upper part of the mirror holder 45. The mirror bracket 43 includes an inclined surface 43a that is inclined so as to rise from the front end in the X direction in the drawing, which contacts the inclined portion of the upper opening edge of the mirror holder 45, and the mirror holder 45. And a parallel surface 43b parallel to the X direction that contacts the parallel portion of the edge of the upper opening. Each of the inclined surface 43a and the parallel surface 43b has an opening, the folding mirror 41 is held so as to close the opening of the inclined surface 43a, and is transmitted so as to close the opening of the parallel surface 43b. A glass 51 is held.

  The folding mirror 41 is positioned and held on the inclined surface 43 a of the mirror bracket 43 by pressing both ends in the Z direction against the inclined surface 43 a of the mirror bracket 43 by a plate pressing member 46 having a leaf spring shape. The one end of the folding mirror 41 in the Z direction is fixed by two mirror pressing members 46, and the other end is fixed by one mirror pressing member 46.

  The transmissive glass 51 is positioned and fixed to the mirror bracket 43 by pressing both ends in the Z direction against the parallel surface 43b of the mirror bracket 43 by the plate spring-like glass pressing members 47. The transmissive glass 51 is held by one glass pressing member 47 at each of both ends in the Z direction.

  The free mirror bracket 44 that holds the curved mirror 42 has arm portions 44a that are inclined so as to descend from the back side in the X direction toward the front side in the figure, on the front side and the back side in the Z-axis direction. The free mirror bracket 44 has a connecting portion 44b that connects the two arm portions 44a at the upper portion of the arm portion 44a. The free mirror bracket 44 has an arm portion 44 a attached to the mirror holder 45 so that the curved mirror 42 covers the opening on the back side in the X direction of the mirror holder 45 in the figure.

  In the curved mirror 42, the substantially central portion of the end portion on the transmission glass 51 side is pressed against the connecting portion 44b of the free mirror bracket 44 by a leaf spring-like free mirror pressing member 49, and the Z axis direction in the drawing on the first optical system side Both ends are fixed to the arm portion 44a of the free mirror bracket 44 by screws.

  The second projection optical system 40 is stacked and fixed on the lens holder 32 of the first projection optical system 30. Specifically, the lower surface of the mirror holder 45 is provided with a lower surface 451 that faces the upper surface of the lens holder 32, and the lower surface 451 has a cylindrical shape for screwing to the first projection optical system 30. 4 are formed (see FIG. 13 for the screwing portions 45a1 and 45a2, see FIG. 7 for the screwing portion 45a3, and the remaining screwing portions are not shown). The second projection optical system 40 passes the screws 48 through the screw through holes 32c1 to 32c3 provided in the lens holder 32 of the first projection optical system 30, and screws the screws 48 into the screw fixing portions 45a1 to 45a3. Thus, the first projection optical system 30 is screwed. At this time, the lower surface of the mirror holder 45 of the second projection optical system 40 comes into contact with the second projection optical system positioning protrusions 32d1 to 32d4 of the lens holder 32, and the second projection optical system 40 is positioned in the Y direction. Fixed.

  When the second projection optical system 40 is stacked and fixed on the lens holder 32 of the first projection optical system 30, as shown in FIG. 11, the portion above the lens holder 32 of the projection lens unit 31 is the second projection optical system. It is stored in the mirror holder 45 of the system 40. Further, when the second projection optical system 40 is mounted and fixed on the lens holder 32, there is a gap between the curved mirror 42 and the lens holder 32, and the idler gear 35 (see FIG. 11) enters the gap. It becomes a shape.

FIG. 15 is a perspective view showing an optical path from the first optical system 70 to the projection surface 2 (screen).
The light beam transmitted through the projection lens unit 31 constituting the first optical system 70 forms an intermediate image conjugate with the image generated by the DMD 12 between the folding mirror 41 and the curved mirror 42. This intermediate image is formed as a curved surface image between the folding mirror 41 and the curved mirror 42. Next, the divergent light beam after forming the intermediate image is incident on the concave curved mirror 42 and becomes a convergent light beam. The curved mirror 42 converts the intermediate image into a “further enlarged image” on the projection surface 2. Projection imaging.

  As described above, the projection optical system is configured by the first optical system 70 and the second optical system, and an intermediate image is formed between the first optical system 70 and the curved mirror 42 of the second optical system. By performing the enlarged projection with the mirror 42, the projection distance can be shortened, and it can be used even in a narrow conference room.

  Further, as shown in FIG. 15, the first projection optical system 30 and the second projection optical system 40 are stacked and fixed on the illumination bracket 26. Further, the light modulation unit 10 is also fixed. Therefore, the leg portion 29 of the illumination bracket 26 is fixed to the base member 53 so as to support the weight of the first projection optical system 30, the second projection optical system 40, and the light modulation unit 10.

  FIG. 16 is a schematic diagram showing an arrangement relationship of each part in the apparatus. As shown in FIG. 16, the light modulation unit 10, the illumination unit 20, the first projection optical system 30, and the second projection optical system 40 are stacked in the Y direction, which is the minor axis direction of the projection surface, and the light source unit 60 is disposed in the Z direction, which is the major axis direction of the projection plane, with respect to the laminated body in which the light modulation unit 10, the illumination unit 20, the first projection optical system 30, and the second projection optical system 40 are laminated. As described above, in the present embodiment, the light modulation unit 10, the illumination unit 20, the first projection optical system 30, the second projection optical system 40, and the light source unit are parallel to the projection image and the projection plane 2. They are arranged side by side in a certain Y direction or Z direction. More specifically, in the direction in which the image forming unit 101 including the light modulation unit 10 and the illumination unit 20 and the projection optical unit 102 including the first projection optical system 30 and the second projection optical system 40 are stacked. The light source unit 60 is connected to the image forming unit 101 in a direction orthogonal to the image forming unit 101. In addition, the image forming unit 101 and the light source unit 60 are arranged on the same straight line parallel to the base member 53. The image forming unit 101 and the projection optical unit 102 are arranged on the same straight line perpendicular to the base member 53, and are arranged in the order of the image forming unit 101 and the projection optical unit 102 from the base member 53 side. . Thereby, it can suppress that the installation space of an apparatus is taken in the direction orthogonal to the surface of the projection image projected on the projection surface 2. FIG. Accordingly, when the image projection apparatus is used on a desk or the like, the apparatus can be prevented from interfering with the arrangement of the desk or chair even in a small room.

  In the present embodiment, a power supply unit 80 for supplying power to the light source 61 and the DMD 11 is disposed above the light source unit 60 in a stacked manner. The light source unit 60, the power source unit 80, the image forming unit 101, and the projection optical unit 102 include the upper surface of the projector described above, the base member 53, and an exterior cover 59 (see FIG. 21) that covers the periphery of the projector 1. It is stored in the container of the projector 1.

FIG. 17 is a diagram illustrating a usage example of the projector 1 according to the present embodiment.
As shown in FIG. 17, the projector 1 of the present embodiment can be used by being suspended from the ceiling 3. In this case, since the projector 1 of the present embodiment is short in the direction orthogonal to the projection plane 2, when installing the projector 1 on the ceiling 3, the projector 1 is installed without interfering with the lighting fixture 4 arranged on the ceiling 3. can do.

FIG. 18 is a perspective view of the projector 1 when used by being suspended from the ceiling 3. FIG. 19 is a diagram illustrating a configuration example of a light receiving device provided in the projector 1, and is a partial cross-sectional side view of the projector 1 in FIG. 18 viewed from the AA direction.
When the projector 1 is suspended from the ceiling 3 and used, an opening through which an infrared light signal (remote control light signal) from a remote control device (not shown) can be passed below the outer plate 1A of the main body casing of the projector 1 The light receiving window 1B, which is a part, is located. The light receiving window 1B is provided with a light transmitting member 90 of the light receiving device that receives an infrared light signal from the remote control device. The light receiving device includes a light transmitting member 90 and a light receiving element 91 as a photoelectric conversion element that receives an infrared light signal and converts it into an electrical signal. The light receiving element 91 is held by a substrate 92 having a drive circuit for driving the light receiving element, a detection circuit for processing a light reception signal, and the like. The substrate 92 is attached to a frame 93 of the casing of the apparatus main body. As the light transmitting member 90, for example, a resin material such as acrylic or polycarbonate having a predetermined transmittance with respect to the wavelength of the infrared light signal from the remote control device can be used.

  The light receiving angle range θ around the light receiving axis La of the light receiving element 91 used in the light receiving device is about 50 ° to 70 °. Lb in FIG. 19 indicates the optical axis corresponding to the lower limit of the receivable angle range by the light receiving element 91. When the projector 1 is installed near the ceiling 3, as shown in FIG. 19, there is a possibility that infrared light signals from below or obliquely below the projector 1 where the user is located cannot be received.

  Therefore, in the light receiving device of the present embodiment, the light transmitting member 90 protrudes on the side opposite to the light receiving element 91 side so that a wide directivity capable of receiving infrared light signals from below or obliquely below the projector 1 can be secured. The light transmitting member 90 having the protruding portion 90a is used. The protrusion 90a has an upper slope 90s1 as a first slope on the upper side in the figure and a lower slope 90s2 as a second slope on the lower side in the figure.

  The upper inclined surface 90 s 1 directs the light signal of the light receiving target that has entered the protrusion 90 a from the direction intersecting the light receiving axis having the maximum light receiving sensitivity of the surface light receiving element 91 (downward in the illustrated example) toward the light receiving element 91. Inclined at an angle to reflect. Note that the inclination angle of the upper inclined surface 90s1 of the protrusion 90a may be an angle at which the light signal of the light reception target incident on the inside of the protrusion 90a from below in the drawing is totally reflected toward the light receiving element 91.

  The lower inclined surface 90s2 is located at a position where light incident on the inside of the protruding portion 91a from the upper inclined surface 90s1 passes, and all light incident on the inside of the protruding portion 90a from the upper inclined surface 90s1 is directed toward the light receiving element 91. Inclined at an angle that does not reflect. The inclination angle of the lower slope 90s2 of the protrusion 90a may be an angle at which light incident on the inside of the protrusion 90a from above in the drawing is not reflected toward the light receiving element 91.

  FIG. 20 is an explanatory diagram illustrating an example of an optical path of an optical signal to be received in the light receiving device of FIG. FIG. 21 is an explanatory view showing an example of an optical path of disturbance light in the light receiving device of FIG. 20 and 21, the inclination angle of the upper inclined surface 90 s 1 of the protrusion 90 a of the light transmitting member 90 is a total reflection angle at which the light signal to be received is totally reflected toward the light receiving element 91 (total reflection criticality). It is an example in the case of (corner).

  In FIG. 20, the infrared optical signal L1 sent from the lower side in the vertical direction toward the protrusion 90a of the light transmitting member 90 enters from the lower slope 90s2 of the protrusion 90a of the light transmitting member 90, and the inside of the protrusion 90a. And enters the upper slope 90s1 of the protrusion 90A at a predetermined incident angle α. At this time, when the incident angle α is larger than the total reflection angle (critical angle of total reflection) of the light transmitting material, the infrared light signal L1 is totally reflected by the upper inclined surface 90s1. The infrared light signal L2 totally reflected toward the light receiving element 91 by the upper inclined surface 90s1 of the protrusion 90A is sent in a substantially horizontal direction in the drawing and received by the light receiving element 91. Here, for example, the total reflection angle is about 42 ° when acrylic is used for the light transmitting material 90, and is about 39 ° when polycarbonate is used. FIG. 20 illustrates the case where the incident angle α is 45 °.

  In FIG. 21, when the disturbance light L3 directed from the indoor lighting device such as an inverter fluorescent lamp toward the projection 90a of the light transmission member 90 reaches the upper slope 90s1 of the projection 90a of the light transmission member 90, a part of the disturbance light L3 is obtained. L4 is reflected in the direction away from the light receiving element 91 by the upper slope 90s1. The other portion L5 of the disturbance light L3 that has reached the upper slope 90s1 of the protrusion 90a is refracted by the upper slope 90s1 and passes through the inside of the protrusion 90a. The disturbance light L5 becomes light directed toward the inside of the housing of the projector 1 due to refraction at the upper inclined surface 90s1, but total reflection such as toward the light receiving element 91 does not occur on the lower inclined surface 90s2 of the projection 90a. The disturbance light L6 refracted by the upper inclined surface 90s1 travels in a direction different from the direction of the light receiving element 91. As a result, even when an indoor lighting device such as an inverter fluorescent lamp is installed on the ceiling 3 in which the projector 1 is suspended, the illumination light as disturbance light from the upper indoor lighting device is transmitted to the projector 1. It does not reach the light receiving element 91. Therefore, it is possible to prevent the light receiving element from malfunctioning due to the illumination light.

FIG. 22 is an explanatory view showing another example of a light receiving optical path in the light receiving device.
As shown in FIG. 19 described above, the protruding portion 90 a of the light transmitting member 90 is provided inside the receivable range through which light that can be received by the light receiving element 91 in the light transmitting member 90 passes. That is, in FIG. 22, the lower end P <b> 1 of the lower slope 90 s <b> 2 of the protrusion 90 a of the light transmitting member 90 is above the lower end P <b> 2 of the light receiving element 91. By providing the projection 90 a in this way, the infrared light signal irradiated from the front direction or the front oblique direction to the light transmitting member 90 of the light receiving window 1 </ b> B does not obstruct the optical path toward the light receiving element 91. That is, the infrared light signal L7 to be received irradiated from the lower front of the light receiving window 1B (lower right in FIG. 22) is not refracted by the lower slope 90s2 of the protrusion 90a, and the main body portion of the protrusion 90a. Pass through. The infrared light signal L8 that has passed through the main body portion of the protrusion 90a reaches the light receiving element 91 and is received. Therefore, even when the light transmission member 90 is irradiated with an optical signal from the front direction or the front oblique direction as in the conventional light receiving device, the light receiving element 91 can more reliably receive the infrared light signal to be received. it can.

FIG. 23 is a front view of the protrusion 90a and the light receiving element 91 of the light receiving device.
23, when viewed from the direction of the light receiving axis of the light receiving element 91, the width of the protrusion 90a in a direction (left-right direction in FIG. 23) orthogonal to the inclination direction of the upper inclined surface 90s1 of the protrusion 90a of the light transmitting member 90. W1 is wider than the width W2 of the light receiving element 95 in the same direction. As a result, when the infrared light signal L8 is irradiated obliquely from below to the protrusion 90a of the light transmission member 90, the infrared light signal that has entered the protrusion 90a and passed through the protrusion 90a. L9 can be totally totally reflected by the upper inclined surface 90s1. The infrared light signal L10 totally reflected by the upper inclined surface 90s1 reaches the light receiving element 91 and is received without being blocked.

  As described above, as shown in FIGS. 19 to 23, by providing the projection 90a on the light transmitting member 90, the light receiving range can be received only with respect to the infrared light signal (remote control light signal) from below or obliquely below the projector. (Direction range) can be expanded. Therefore, it is possible to increase the sensitivity to the remote control operation by the user of the projector 1 and to prevent the malfunction of the light receiving device due to the room illumination light from above or obliquely above the projector 1.

  In the above embodiment, the case where an optical signal in the infrared wavelength region is used as the remote control optical signal has been described. However, the present invention is similarly applied to a light receiving device that receives an optical signal in a wavelength other than the infrared wavelength region. Can be applied.

  In addition, the position of the user (remote control position) that transmits the light signal to be received by the light receiving device and the position of the instrument or device that emits disturbance light are not limited to the positions in the above embodiment. For example, the position of the user (remote control position) that sends the optical signal to be received by the light receiving device is above or obliquely above the light receiving device, and the position of the instrument or device that emits disturbance light that prevents the light receiving device from receiving light is received. It may be below or obliquely below the device. In addition, the position of the user (the position of the remote control) that transmits the optical signal to be received by the light receiving device is in the right direction toward the light receiving device, and the position of the instrument or device that emits disturbance light that prevents the light receiving device from receiving light is It may be in the left direction toward the light receiving device.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
(Aspect A)
A light receiving device including a photoelectric conversion element such as a light receiving element 91 that receives an optical signal and converts it into an electrical signal, and a light transmitting member 90 that is held so that the optical signal received by the photoelectric conversion element passes therethrough, The transmissive member 90 has a protrusion 90a that protrudes on the side opposite to the photoelectric conversion element side, and the protrusion 90a is located inside the protrusion 90a from the direction intersecting the light receiving axis La having the maximum light receiving sensitivity of the photoelectric conversion element. The first inclined surface such as the upper inclined surface 90s1 that is inclined at an angle that reflects the light signal to be received incident on the photoelectric conversion element toward the photoelectric conversion element.
According to this, as described in the above embodiment, the light transmission member that is held so that the optical signal received by the photoelectric conversion element passes has a protruding portion that protrudes on the side opposite to the photoelectric conversion element side. The photoelectric conversion element can receive the light signal of the light receiving target that has passed through the inside of the protrusion and is incident on the first inclined surface by the first inclined surface of the protrusion. Directivity can be secured. And the 1st inclined surface of a projection part inclines so that the said optical signal of the said light reception object may be reflected toward a photoelectric conversion element. For this reason, the light that is opposite to the light signal to be received, that is, the light incident on the first inclined surface from the outside is reflected in the direction away from the photoelectric conversion element. Thereby, even if disturbance light is incident on the first inclined surface of the protrusion from the outside, the disturbance light is not received by the photoelectric conversion element, so that malfunction due to the disturbance light can be prevented.
(Aspect B)
In the aspect A, the inclination angle of the first inclined surface such as the upper inclined surface 90s1 of the protrusion 90a causes the light signal to be received to be totally reflected toward the photoelectric conversion element such as the light receiving element 91. According to this, as described in the above embodiment, the light signal of the light reception target is totally reflected toward the photoelectric conversion element by the first inclined surface of the protrusion, thereby further improving the sensitivity to the light signal of the light reception target. Can be increased.
(Aspect C)
In the above-described aspect A or B, the protrusion 90a transmits light incident on the protrusion 90a to a location where light incident on the protrusion 90a from the first inclined surface such as the upper inclined surface 90s1 passes. A second inclined surface such as a lower inclined surface 90s2 that is inclined at an angle at which it is not totally reflected toward the photoelectric conversion element such as the light receiving element 91 is provided. According to this, as described in the above embodiment, the light incident on the inside of the protruding portion from the first inclined surface of the protruding portion is not totally reflected toward the photoelectric conversion element on the second inclined surface. Thereby, it is possible to suppress disturbance light incident from the first inclined surface from traveling toward the photoelectric conversion element, and to more reliably prevent malfunction due to disturbance light.
(Aspect D)
In any of the above aspects A to C, the inclination angle of the second inclined surface such as the lower inclined surface 90s2 of the protrusion 90a is incident on the inside of the protrusion 90a from the first inclined surface such as the upper inclined surface 90s1. The angle at which the reflected light is not reflected toward the photoelectric conversion element such as the light receiving element 91. According to this, as described in the above embodiment, light incident on the inside of the protrusion from the first inclined surface of the protrusion is not reflected toward the photoelectric conversion element on the second inclined surface. As a result, disturbance light incident from the first inclined surface can be prevented from traveling toward the photoelectric conversion element, and malfunction due to disturbance light can be further reliably prevented.
(Aspect E)
In any of the above-described aspects A to D, the protrusion 90 a is provided inside the receivable range through which light that can be received by a photoelectric conversion element such as the light receiving element 91 in the light transmitting member 90 passes. According to this, as described in the above embodiment, the optical signal irradiated from the front direction or the front oblique direction with respect to the light transmissive member is not affected by the optical path toward the photoelectric conversion element, and the projection portion is not obstructed. The light passes through and reaches the photoelectric conversion element and is received. Therefore, even when a light signal is irradiated from the front direction or the front oblique direction to the light transmission member as in the conventional light receiving device, the light signal to be received can be more reliably received by the photoelectric conversion element.
(Aspect F)
In any of the above aspects A to E, when viewed from the direction of the light receiving axis of the photoelectric conversion element such as the light receiving element 91, the protrusion in the width direction orthogonal to the inclination direction of the first inclined surface such as the upper inclined surface 90s1 The width W1 of 90a is wider than the width W2 of the photoelectric conversion element in the width direction. According to this, as described in the above embodiment, when the light signal to be received is irradiated obliquely from below toward the protrusion of the light transmitting member, the protrusion is incident from the end in the width direction of the protrusion. The optical signal that has passed through the interior of the first can be reliably totally reflected by the first inclined surface. Thereby, the optical signal totally reflected by the first inclined surface reaches the photoelectric conversion element and is received without being obstructed, so that the sensitivity to the optical signal to be received can be further increased.
(Aspect G)
An image projecting device such as a projector 1 that includes a light receiving device that receives a light signal for remote operation and that can be controlled based on the light signal for remote operation received by the light receiving device. Or the light receiving device of any one of F. According to this, as described in the above embodiment, it is possible to prevent erroneous control of remote operation due to ambient light while ensuring wide directivity with respect to the optical signal for remote operation.
(Aspect H)
In the above aspect G, the light transmission member 90 is provided in an opening formed in an outer plate of an image projection apparatus such as the projector 1. According to this, as described in the above embodiment, along the outer plate toward the protrusion 90a of the light transmitting member 90 provided with the opening formed in the outer plate of the image projection apparatus such as the projector 1. Even when the optical signal for remote operation is emitted from the direction, the image projection apparatus can be remotely operated.

1: Projector 1A: Outer plate 1B: Light receiving window 2: Projection surface 3: Ceiling 4: Lighting fixture 83: Operation unit 90: Light transmission member 90a: Projection 90s1: First inclined surface 90s2: Second inclined surface 91 : Infrared light receiving element 92: Substrate 93: Holding member La: Light receiving axis Lb of infrared light receiving element: Lower limit optical axis of light receiving range

JP 2010-85555 A

Claims (8)

A light receiving device comprising: a photoelectric conversion element that receives an optical signal and converts it into an electrical signal; and a light transmissive member that is held so that the optical signal received by the photoelectric conversion element passes therethrough,
The light transmissive member has a protrusion protruding to the opposite side to the photoelectric conversion element side,
The protrusion is inclined at an angle that reflects the light signal of the light receiving target incident inside the protrusion from the direction intersecting the light receiving axis having the maximum light receiving sensitivity of the photoelectric conversion element toward the photoelectric conversion element. A light-receiving device having a first inclined surface. The light-receiving device according to claim 1.
The inclination angle of the first inclined surface of the projection is an angle for totally reflecting the light signal to be received toward the photoelectric conversion element. The light-receiving device according to claim 1 or 2,
The protrusion is inclined at an angle at which the light incident on the inside of the protrusion passes from the first inclined surface so as not to totally reflect the light incident on the protrusion toward the photoelectric conversion element. An image projection apparatus having a second inclined surface. The light receiving device according to any one of claims 1 to 3,
The inclination angle of the second inclined surface of the protrusion is an angle that does not reflect light incident on the protrusion from the first inclined surface toward the photoelectric conversion element. apparatus. The light receiving device according to any one of claims 1 to 4,
The light receiving device, wherein the protrusion is provided inside a light receivable range in which light that can be received by the photoelectric conversion element in the light transmitting member passes. The light receiving device according to any one of claims 1 to 5,
When viewed from the direction of the light receiving axis of the photoelectric conversion element, the width of the protrusion in the width direction orthogonal to the inclination direction of the first inclined surface is wider than the width of the photoelectric conversion element in the width direction. A light receiving device characterized by the above. An image projection device comprising a light receiving device for receiving a light signal for remote operation, which can be controlled based on the light signal for remote operation received by the light receiving device,
7. The image projection device according to claim 1, wherein the light receiving device is the light receiving device according to claim 1. The image projection apparatus according to claim 7.
The image projection apparatus, wherein the light transmission member is provided in an opening formed in an outer plate of the image projection apparatus.

Images