Projector

Abstract

This projector comprises: an optical modulation element that modulates light from a light source into image light; a projection lens that projects the image light; a lens holding member that holds the projection lens; an optical modulation element holding member that holds the optical modulation element; a connection member that fixes the lens holding member and the optical modulation element holding member; and a cooling device that cools the lens holding member. The lens holding member includes a portion extending in the optical axis direction of the projection lens. The optical modulation element holding member is fixed, by the connection member, to the portion extending in the optical axis direction in the lens holding member. The cooling device comprises: a heat receiving part that is in contact with the portion extending the axial direction in the lens holding member; and a heat dissipation part that cools the heat receiving part.

Description

Projector

[0001] The present disclosure relates to a projector.

[0002] There is a demand for suppressing defocus caused by thermal deformation due to temperature changes inside the projector when the projector is operating. Patent Document 1 discloses a projector including a display unit that displays an image, a projection lens that projects the image displayed on the display unit, a connecting unit that connects the display unit and the projection lens, a detection unit, and a lens moving unit. In this projector, the detection unit detects information regarding the state of the connecting unit, and the lens moving unit moves at least a part of the projection lens based on the detection result of the detection unit.

[0003] Japanese Patent Application Laid-Open No. 2011-053512

[0004] In order to suppress defocus caused by temperature changes in the projector, for example, execution of temperature adjustment such as cooling of the projector can be considered. However, in Patent Document 1, temperature adjustment of the projector is not considered.

[0005] The present disclosure has been devised in view of the above-described conventional situation, and an object thereof is to suppress focus deviation due to temperature changes in the projector.

[0006] The present disclosure provides a projector including an optical modulation element that modulates light from a light source into image light, a projection lens that projects the image light, a lens holding member that holds the projection lens, an optical modulation element holding member that holds the optical modulation element, a connecting member that fixes the lens holding member and the optical modulation element holding member, and a cooling device that cools the lens holding member. The lens holding member has a portion extending in the optical axis direction of the projection lens, the optical modulation element holding member is fixed to the portion of the lens holding member extending in the optical axis direction by the connecting member, and the cooling device includes a heat receiving portion that contacts the portion of the lens holding member extending in the optical axis direction and a heat radiating portion that cools the heat receiving portion.

[0007] Furthermore, any combination of the above components, as well as any conversion of the expressions of this disclosure between methods, apparatus, systems, storage media, computer programs, etc., are also valid as aspects of this disclosure.

[0008] According to this disclosure, it is possible to suppress focus shifts caused by temperature changes in the projector.

[0009] External perspective view of the projector according to Embodiment 1 External perspective view illustrating the cooling device and temperature sensor provided in the projector according to Embodiment 1 Schematic side view illustrating the configuration of the projector according to Embodiment 1 Schematic side view showing a first example of the arrangement of the heat receiving section of the cooling device according to Embodiment 1 Schematic side view showing a second example of the arrangement of the heat receiving section of the cooling device according to Embodiment 1

[0010] The following description will detail embodiments of the projector disclosed herein, with appropriate reference to the drawings. However, unnecessary details may be omitted. For example, detailed explanations of already well-known matters and redundant explanations of substantially identical configurations may be omitted. This is to avoid the following description becoming unnecessarily verbose and to facilitate understanding by those skilled in the art. The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter of the claims.

[0011] (Embodiment 1) Figure 1 is an external perspective view of the projector 1 according to Embodiment 1. For the sake of explanation, the axis extending in the height direction of the place where the projector 1 is placed will be referred to as the Z-axis. The place where the projector 1 is placed can be, for example, the floor, on a desk, on a table, etc. The axis perpendicular to the Z-axis and extending from the back of the projector 1 to the front will be referred to as the X-axis. The front of the projector 1 is the surface on which the projection lens 2 is provided. The axis perpendicular to the X-axis and the Z-axis will be referred to as the Y-axis. For the sake of explanation, the positive direction of the Z-axis may be referred to as "up," the negative direction of the Z-axis as "down," the positive direction of the X-axis as "left," the negative direction of the X-axis as "right," the positive direction of the Y-axis as "forward," and the negative direction of the Y-axis as "backward." Furthermore, these directional expressions are used for the sake of explanation and are not intended to limit the orientation of the structure during actual use.

[0012] The projector 1 comprises a projection lens 2, a lens holding member 3, a light modulation element 4, a light modulation element holding member 5, a connecting member 6 (see Figure 3, 4, or 5), a cooling device 7 (see Figure 3), a temperature sensor 8 (see Figure 2), and a control device 9 (see Figure 3). A detailed description of the operation of the projector 1 is omitted in this specification. Furthermore, the projector 1 may be equipped with various devices for projecting images, such as a light source device. This description will focus on the functions according to this embodiment.

[0013] The optical modulation element 4 modulates light from a light source (not shown) into image light. The projection lens 2 projects the image light. As a result, the projector 1 can project an image. The optical modulation element 4 is held by the optical modulation element holding member 5. The projection lens 2 is held by the lens holding member 3. As will be described later with reference to Figure 3, the lens holding member 3 and the optical modulation element holding member 5 are fixed together by a connecting member 6.

[0014] Next, the cooling device 7 and temperature sensor 8 will be described with reference to Figure 2, which shows the projector 1 viewed from below. Figure 2 is an external perspective view illustrating the cooling device 7 and temperature sensor 8 provided in the projector 1 according to Embodiment 1.

[0015] The cooling device 7 is attached to the lower surface 10 of the lens holding member 3. The cooling device 7 is a device for cooling the lens holding member 3 and lowering its temperature. The cooling device 7 comprises a heat receiving section 7A, a heat dissipation section 7B, and a connecting section 7C. In this embodiment, the cooling device 7 is assumed to cool the lens holding member 3 by a liquid cooling method. The cooling method by the cooling device 7 is not limited to a liquid cooling method. For example, the cooling device 7 may cool the lens holding member 3 by other cooling methods such as an air cooling method, and the configuration of the cooling device 7 may be changed depending on the cooling method.

[0016] The heat receiving section 7A of the cooling device 7 is in contact with the lower surface 10 of the lens holding member 3 and absorbs heat from the lens holding member 3. The heat receiving section 7A may be made of a material with high thermal conductivity, such as aluminum or copper. The connection section 7C is a pipe through which the refrigerant flows, i.e., a refrigerant pipe. The refrigerant may be, for example, water. The connection section 7C includes at least two refrigerant pipes: one for the refrigerant to flow from the heat dissipation section 7B to the heat receiving section 7A, and another for the refrigerant to flow from the heat receiving section 7A to the heat dissipation section 7B. The heat dissipation section 7B may be, for example, a radiator. The heat dissipation section 7B may further include a fan.

[0017] The heat receiving section 7A absorbs heat from the lens holding member 3. Then, in the heat receiving section 7A, the heat from the lens holding member 3 is absorbed by the refrigerant. As a result, the temperature of the refrigerant that has absorbed the heat rises. The refrigerant that has absorbed the heat flows through the connection section 7C, i.e., the refrigerant piping, to the heat dissipation section 7B. The heat dissipation section 7B releases the heat from the refrigerant that has absorbed the heat. As a result, the temperature of the refrigerant decreases. The refrigerant from which heat has been released in the heat dissipation section 7B flows through the connection section 7C and heads towards the heat receiving section 7A. In other words, the heat dissipation section 7B cools the heat receiving section 7A. In this way, the cooling device 7 cools the lens holding member 3 by circulating the refrigerant.

[0018] The temperature sensor 8 may be attached to the lower surface 10 of the lens holding member 3, or to the upper surface 11 of the lens holding member 3 (see Figures 3, 4, or 5). Figure 2 shows an example in which the temperature sensor 8 is attached to the lower surface 10 of the lens holding member 3.

[0019] The temperature sensor 8 detects the temperature of the lens holding member 3. The control device 9 (see Figure 3) controls the cooling intensity of the lens holding member 3 by the cooling device 7 based on the temperature detection result of the temperature sensor 8. Specifically, the control device 9 may adjust the flow rate of the refrigerant or, if the heat dissipation unit 7B is equipped with a fan, adjust the speed of the fan so that the detected temperature becomes or approaches a specified temperature.

[0020] Figure 3 is a schematic side view illustrating the configuration of the projector 1 according to Embodiment 1.

[0021] As shown in Figure 3, the temperature sensor 8 may be attached to the upper surface 11 of the lens holding member 3. Hereinafter, the upper surface 11 of the lens holding member 3 may be referred to as the first surface. Also, hereafter, the lower surface 10 of the lens holding member 3 may be referred to as the second surface.

[0022] The lens holding member 3 and the optical modulation element holding member 5 are fixed together by a connecting member 6. The connecting member 6 may be, for example, a pin. Each of the lens holding member 3 and the optical modulation element holding member 5 is configured to be connectable to the connecting member 6. For example, each of the lens holding member 3 and the optical modulation element holding member 5 may have a hole that can engage with the connecting member 6. The lens holding member 3 has a portion that holds the projection lens 2 and a portion that extends from the portion that holds the projection lens 2 in the direction of the optical axis (X-axis) of the projection lens 2. The optical modulation element holding member 5 is fixed to the portion of the lens holding member 3 that extends in the direction of the optical axis by the connecting member 6. The upper surface of the portion of the lens holding member 3 that extends in the direction of the optical axis is the upper surface 11 of the lens holding member 3, and the lower surface of the portion of the lens holding member 3 that extends in the direction of the optical axis is the lower surface 10 of the lens holding member 3.

[0023] The connecting member 6 may be positioned closer to the optical modulation element 4 than the intermediate position 50 between the projection lens 2 and the optical modulation element 4. The connecting member 6 may also be used as a means to determine the position of the optical modulation element 4 in the X-axis direction. In the example in Figure 3, the right end of the connecting member 6 and the left end of the optical modulation element 4 are positioned in the X-axis direction, respectively. Thus, when viewed from the bottom surface 10 to the top surface 11 in a plan view, at least a part of the connecting member 6 may overlap with the optical modulation element 4. Hereinafter, the position of the center of the connecting member 6 in the X-axis direction will be referred to as the optical modulation element positioning position 30.

[0024] Furthermore, the position in the X-axis direction where the lens holding member 3 holds the projection lens 2 is referred to as the lens positioning position 20.

[0025] The focus of the projector 1 is affected by the relative positions of the projection lens 2 and the light modulation element 4. Therefore, it is preferable that the distance between the projection lens 2 and the light modulation element 4 does not change during the operation of the projector 1. This is because a change in the distance between the projection lens 2 and the light modulation element 4 can cause focus drift, which can blur the image projected by the projector 1.

[0026] However, during the operation of the projector 1, the lens holding member 3 may undergo thermal deformation due to the heat generated by the operation of the projector 1, and may stretch in the direction of the white arrow shown in Figure 3 (negative direction of the X axis). The heat generated during the operation of the projector 1 includes, for example, the heat generated by the light source (not shown), prism (not shown), or optical modulation element 4 during the operation of the projector 1. As the lens holding member 3 stretches in the direction of the white arrow due to thermal deformation, the position of the connecting member 6 shifts in the direction of the white arrow, and the optical modulation element holding member 5 and optical modulation element 4 also shift in the direction of the white arrow. This changes the distance between the optical modulation element positioning position 30 and the lens positioning position 20. In other words, the distance between the projection lens 2 and the optical modulation element 4 changes, causing focus drift.

[0027] The cooling device 7 suppresses the temperature rise and thermal deformation of the lens holding member 3. By suppressing thermal deformation, focus drift is suppressed. Furthermore, by suppressing focus drift, it becomes possible to shorten the focus stabilization time of the projector 1. Focus stabilization time is the time it takes for the focus adjustment of the projector 1 to be completed and for the projected image to become clear. A short focus stabilization time is preferable. In this embodiment, the heat receiving section 7A of the cooling device 7 is arranged so as to concentrate the cooling of the part of the lens holding member 3 that affects focus drift. The part of the lens holding member 3 that affects focus drift is the part of the lens holding member 3 that extends in the direction of the optical axis, and more specifically, the part of the lens holding member 3 in the area 40 between the optical modulation element positioning position 30 and the lens positioning position 20. For example, when the heat receiving section 7A is arranged on the lower surface 10 of the lens holding member 3 and within the range of area 40, it is possible to suppress focus drift more efficiently compared to when the heat receiving section 7A is arranged to the right of the optical modulation element positioning position 30 on the lower surface 10 of the lens holding member 3.

[0028] As shown in Figure 3, when the heat receiving portion 7A is positioned on the lens holding member 3 across the entire area 40 and from end to end in the Y-axis direction, the cooling effect of the cooling device 7 on the lens holding member 3 is higher compared to when the heat receiving portion 7A is positioned on the lens holding member 3 in only a part of the area 40. However, the larger the contact area between the heat receiving portion 7A and the lens holding member 3, in other words, the larger the heat receiving portion 7A is designed to be, the higher the manufacturing cost of the heat receiving portion 7A becomes. Furthermore, from the viewpoint of miniaturizing the projector 1, it is preferable that the heat receiving portion 7A (cooling device 7) is also small.

[0029] Therefore, in this embodiment, with reference to Figures 4 and 5, an example will be described in which the heat receiving portion 7A is arranged to contact a part of the lens holding member 3, as shown in Figure 2. Figure 4 is a schematic side view showing a first example of the arrangement of the heat receiving portion 7A of the cooling device 7 according to Embodiment 1. Note that in Figure 4 and Figure 5, which will be described later, the heat dissipation portion 7B, the connection portion 7C, and the control device 9 are not shown.

[0030] In the example shown in Figure 4, the heat receiving section 7A is positioned on the lower surface 10 of the lens holding member 3, between the connecting member 6 and the projection lens 2. In other words, the heat receiving section 7A is positioned on the lower surface 10 of the lens holding member 3, within the area 40 between the lens positioning position 20 and the optical modulation element positioning position 30. This allows the heat receiving section 7A to concentrate cooling on the part of the lens holding member 3 that affects focus drift. The length of the heat receiving section 7A in the Y-axis direction is not particularly limited, but as in the example in Figure 2, the heat receiving section 7A may be configured to contact a part of the lens holding member 3 in the Y-axis direction as well. This is also the case in the example shown in Figure 5.

[0031] By positioning the heat receiving section 7A to concentrate cooling on the parts that affect focus drift, it becomes possible to suppress focus drift more efficiently compared to, for example, the case where the heat receiving section 7A is positioned to the right of the optical modulation element positioning position 30 on the lower surface 10 of the lens holding member 3.

[0032] In the example shown in Figure 4, the temperature sensor 8 is also positioned within the area 40 between the connecting member 6 and the projection lens 2, in other words, within the area between the lens positioning position 20 and the optical modulation element positioning position 30. The temperature sensor 8 may be positioned on the upper surface 11 or the lower surface 10 of the lens holding member 3, as shown in Figure 4. This allows the temperature sensor 8 to detect the temperature of the part of the lens holding member 3 that affects focus drift. As a result, the control device 9 can control the cooling intensity with higher precision compared to the case where the temperature sensor 8 is positioned, for example, to the right of the optical modulation element positioning position 30. In other words, by detecting the temperature of the part of the lens holding member 3 that affects focus drift, the control device 9 can accurately adjust the temperature of the lens holding member 3 to or near the target temperature (default temperature).

[0033] As shown in Figure 5, by further limiting the position of the heat receiving section 7A, it is possible to further shorten the focus stabilization time. Figure 5 is a schematic side view showing a second example of the arrangement of the heat receiving section 7A of the cooling device 7 according to Embodiment 1.

[0034] In the example shown in Figure 5, the heat receiving portion 7A is positioned such that, when viewed from above from the lower surface 10 to the upper surface 11 of the lens holding member 3, all surfaces of the heat receiving portion 7A that contact the lower surface 10 overlap with the surfaces that contact the upper surface 11 of the optical modulation element holding member 5. In other words, the heat receiving portion 7A is positioned on the lower surface 10 of the lens holding member 3 within the area 70 between the optical modulation element positioning position 30 and the optical modulation element holding member end position 60. The optical modulation element holding member end position 60 is the position of the end of the optical modulation element holding member 5 on the front side of the projector 1 in the X-axis direction. Area 70 is a part of the lens holding member 3 that is particularly affected by focus drift, and where heat generated as the projector 1 operates is especially concentrated.

[0035] By positioning the heat receiving section 7A within the area 70, for example, compared to the case where part or all of the heat receiving section 7A is positioned within the area 80 between the end position 60 of the optical modulation element holding member and the lens positioning position 20, further suppression of focus drift and further shortening of focus stabilization time can be achieved. This is because positioning the heat receiving section 7A within the area 70 allows for more efficient absorption of the heat generated in conjunction with the operation of the projector 1.

[0036] By limiting the placement of the temperature sensor 8 to within the area 70, the control device 9 can control the cooling intensity of the lens holding member 3 by the cooling device 7 with even greater precision. The temperature sensor 8 may be placed on the lower surface 10 of the lens holding member 3, as shown in the example in Figure 5. The temperature sensor 8 may be placed on the lower surface 10 between the connecting member 6 and the projection lens 2, and such that all surfaces of the temperature sensor 8 that contact the lower surface 10 overlap with surfaces that contact the upper surface 11 of the light modulation element holding member 5. When the temperature sensor 8 is placed on the lower surface 10, it may be placed so as not to contact the heat receiving part 7A. In other words, the temperature sensor 8 may be placed on the lower surface 10 of the lens holding member 3 within the area 70 between the light modulation element positioning position 30 and the light modulation element holding member end position 60.

[0037] Alternatively, the temperature sensor 8 may be positioned on the upper surface 11 of the lens holding member 3. For example, the temperature sensor 8 may be positioned on the upper surface 11 of the lens holding member 3 such that, when viewed from the lower surface 10 to the upper surface 11 of the lens holding member 3 in a plan view, all surfaces of the temperature sensor 8 that contact the upper surface 11 overlap with the surface of the heat receiving portion 7A. In short, the temperature sensor 8 may be positioned directly above the heat receiving portion 7A, with the lens holding member 3 in between.

[0038] As a result, the temperature sensor 8 can detect the temperature of the area in the lens holding member 3 where heat generated during the operation of the projector 1 is particularly concentrated, among the areas that affect the focus drift of the lens holding member 3. This allows the control device 9 to control the cooling intensity with greater precision compared to, for example, when some or all of the temperature sensor 8 is located in area 80. In other words, by having the temperature sensor 8 detect the temperature of the area in the lens holding member 3 where heat is particularly concentrated, among the areas that affect the focus drift of the lens holding member 3, the control device 9 can adjust the temperature of the lens holding member 3 to or near the target temperature (default temperature) with greater precision.

[0039] (Summary of Embodiment 1) The following technology is disclosed based on the description of Embodiment 1 above.

[0040] (Technology 1) A projector (for example, projector 1) comprises an optical modulation element (for example, optical modulation element 4) that modulates light from a light source into image light, a projection lens (for example, projection lens 2) that projects the image light, a lens holding member (for example, lens holding member 3) that holds the projection lens, an optical modulation element holding member (for example, optical modulation element holding member 5) that holds the optical modulation element, a connecting member (for example, connecting member 6) that fixes the lens holding member and the optical modulation element holding member, and a cooling device (for example, cooling device 7) that cools the lens holding member. The lens holding member has a portion that extends in the direction of the optical axis of the projection lens, the optical modulation element holding member is fixed to the portion of the lens holding member that extends in the direction of the optical axis by the connecting member, and the cooling device comprises a heat receiving portion (for example, heat receiving portion 7A) that contacts the portion of the lens holding member that extends in the direction of the optical axis, and a heat dissipation portion (for example, heat dissipation portion 7B) that cools the heat receiving portion.

[0041] As a result, the projector can suppress the focus shift caused by the temperature change of the projector.

[0042] (Technology 2) In the projector described in Technology 1, the light modulation element holding member is fixed to the first surface (for example, the upper surface 11) of the portion extending in the optical axis direction in the lens holding member, and the heat receiving portion may be disposed between the connecting member and the projection lens on the second surface (for example, the lower surface 10) opposite to the first surface of the lens holding member.

[0043] As a result, the cooling device can intensively cool the portion of the lower surface of the lens holding member that affects focus drift.

[0044] (Technology 3) In the projector described in Technology 2, when viewing the direction from the second surface to the first surface in a plan view, the heat receiving portion may be arranged such that all the surfaces contacting the second surface of the heat receiving portion overlap with the surfaces contacting the first surface of the light modulation element holding member.

[0045] As a result, the cooling device can cool the portion where heat is particularly concentrated among the portions of the lower surface of the lens holding member that affect focus drift.

[0046] (Technology 4) In the projector described in any one of Technologies 1 to 3, the connecting member may be located closer to the light modulation element than the intermediate position between the projection lens and the light modulation element.

[0047] As a result, the connecting member is used as a means for determining the position of the light modulation element by being located closer to the light modulation element than the intermediate position between the projection lens and the light modulation element.

[0048] (Technology 5) In the projector described in any one of Technologies 1 to 4, when viewing the direction from the second surface to the first surface in a plan view, at least a part of the connecting member may be positioned so as to overlap with the light modulation element.

[0049] As a result, the connecting member is used as a means for determining the position of the light modulation element by being positioned such that a part thereof overlaps with the light modulation element.

[0050] (Technical 6) The projector described in Technical 2 or 3 may include a temperature sensor (e.g., temperature sensor 8) for detecting the temperature of the lens holding member, and a control device (e.g., control device 9) for controlling the cooling intensity of the lens holding member by a cooling device based on the temperature detection result.

[0051] This allows the projector to control the cooling intensity of the lens holder based on its temperature, enabling efficient focus adjustment.

[0052] (Technical 7) In the projector described in Technical 6, the temperature sensor may be positioned on the second surface between the connecting member and the projection lens, and all surfaces of the temperature sensor that contact the second surface may overlap with the surface that contacts the first surface of the optical modulation element holding member.

[0053] This allows the temperature sensor to detect the temperature of the part of the lens holder's underside that is affected by focus drift.

[0054] (Technical 8) In the projector described in Technical 6, the temperature sensor may be positioned such that, when viewed from the second surface to the first surface in a plan view, all surfaces of the temperature sensor that contact the first surface overlap with the surface of the heat receiving part on the first surface of the lens holding member.

[0055] This allows the temperature sensor to detect the temperature of the portion of the lens holder's upper surface that affects focus drift.

[0056] While embodiments have been described above with reference to the attached drawings, this disclosure is not limited to such examples. It is clear to those skilled in the art that various modifications, alterations, substitutions, additions, deletions, and equivalents can be conceived within the scope of the claims, and these are also understood to fall within the technical scope of this disclosure. Furthermore, the components of the embodiments described above can be combined in any way without departing from the spirit of the invention.

[0057] The technology disclosed herein is useful as a projector.

[0058] 1 Projector 2 Projection lens 3 Lens holder 4 Optical modulation element 5 Optical modulation element holder 6 Connecting member 7 Cooling device 7A Heat receiving section 7B Heat dissipation section 7C Connection section 8 Temperature sensor 9 Control device 10 Bottom surface 11 Top surface 20 Lens positioning position 30 Optical modulation element positioning position 40, 70, 80 Area 50 Intermediate position 60 Optical modulation element holder end position

Claims

1. A projector comprising: an optical modulation element that modulates light from a light source into image light; a projection lens that projects the image light; a lens holding member that holds the projection lens; an optical modulation element holding member that holds the optical modulation element; a connecting member that fixes the lens holding member and the optical modulation element holding member; and a cooling device that cools the lens holding member, wherein the lens holding member has a portion that extends in the direction of the optical axis of the projection lens, the optical modulation element holding member is fixed to the portion of the lens holding member that extends in the direction of the optical axis by the connecting member, and the cooling device comprises a heat receiving portion that contacts the portion of the lens holding member that extends in the direction of the optical axis, and a heat dissipation portion that cools the heat receiving portion.

2. The projector according to claim 1, wherein the optical modulation element holding member is fixed to a first surface of the portion of the lens holding member that extends in the direction of the optical axis, and the heat receiving portion is disposed between the connecting member and the projection lens on a second surface of the lens holding member opposite to the first surface.

3. The projector according to claim 2, wherein, when viewed from the second surface towards the first surface in a plan view, all surfaces of the heat receiving portion that contact the second surface overlap with the surfaces that contact the first surface of the optical modulation element holding member.

4. The projector according to claim 3, wherein the connecting member is located closer to the light modulation element than to an intermediate position between the projection lens and the light modulation element.

5. The projector according to claim 4, wherein the connecting member is positioned such that, when viewed from the second surface towards the first surface in a plan view, at least a portion of the connecting member overlaps with the optical modulation element.

6. The projector according to claim 3, comprising: a temperature sensor for detecting the temperature of the lens holding member; and a control device for controlling the cooling intensity of the lens holding member by the cooling device based on the temperature detection result.

7. The projector according to claim 6, wherein the temperature sensor is positioned on the second surface between the connecting member and the projection lens, and all surfaces of the temperature sensor that contact the second surface overlap with the surfaces that contact the first surface of the optical modulation element holding member.

8. The projector according to claim 6, wherein the temperature sensor is positioned on the first surface of the lens holding member such that, when viewed from the second surface towards the first surface in a plan view, all surfaces of the temperature sensor that contact the first surface overlap with the surface of the heat receiving portion.

Images