JP2018205656A - projector - Google Patents

Abstract

To provide a projector in which a projection lens can be disposed at a predetermined position by an easy manufacturing process.SOLUTION: The projector includes a light source, an optical modulation device, a projection lens 4 and a support mechanism 5 having an insertion hole 61H where the projection lens 4 is inserted and supporting the projection lens 4. The projection lens includes a plurality of lenses, a cylindrical part 41 accommodating the plurality of lenses, and a guide cylinder 40 having an engaging part that protrudes from the cylindrical part 41 and engages with a peripheral edge of the insertion hole 61 when the projection lens 4 as inserted into the insertion hole 61H is rotated. The support mechanism 5 includes a support part 6 having the insertion hole 61H, and a first screw SC1 that is inserted into the guide cylinder 40 while the engaging part is engaged with the peripheral edge of the insertion hole 61H and that regulates the rotation of the projection lens 4 with respect to the support part 6.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a projector.

  Conventionally, there is known a projector that modulates light emitted from a light source according to image information and projects the modulated light by a projection optical device. And the structure for arrange | positioning a projection optical apparatus in the predetermined position in a projector is disclosed (for example, refer patent document 1).

  The projector (projection display device) described in Patent Document 1 includes a unit including a light modulation unit, a cross dichroic prism, a composite base, a projection lens, an upper mounting bracket, and a lower mounting bracket. The synthetic base has a box-shaped portion having a rectangular shape in plan view. The projection lens has a flange portion, and is fixed to the synthetic base by screwing a screw inserted from the box-shaped portion side of the synthetic base into the flange portion.

JP 2005-140895 A

  However, the structure described in Patent Document 1 has a large number of parts, and the position of the projection lens on the positioning pin provided at the position where the box-shaped portion of the composite base is deep, that is, the position where the assembly operator is difficult to see. And a structure that is screwed while supporting the projection lens, there is a problem that the manufacturing process becomes complicated.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes a light source, a light modulation device that modulates light emitted from the light source, a projection optical device that projects light modulated by the light modulation device, and the projection. And a support mechanism for supporting the projection optical device, wherein the projection optical device includes a plurality of lenses disposed along an optical axis, and the plurality of lenses. A lens having a cylindrical portion to be accommodated, and an engaging portion that protrudes from the cylindrical portion and engages with a peripheral portion of the insertion hole when the projection optical device is rotated in a state of being inserted into the insertion hole. And the support mechanism is inserted into the support portion or the lens housing in an engaged state in which the engagement portion is engaged with the peripheral portion. , Rotation of the projection optical device relative to the support Characterized by comprising a first screw for regulating the.

  According to this configuration, the projection optical device is rotated in a state of being inserted into the insertion hole of the support portion, whereby the engaging portion is engaged with the peripheral edge portion of the insertion hole to be in the engaged state. In this engaged state, the projection optical device is fixed to the support unit by being restricted from rotating with respect to the support unit by the first screw. As a result, it is possible to provide a projector that can arrange the projection optical apparatus at a predetermined position with a small number of parts and easy manufacture.

  Application Example 2 In the projector according to the application example described above, the cylindrical portion has a first screw hole into which the first screw is inserted on an end surface opposite to a side on which the projection optical device projects light. And it is preferable that the said support part has an opening part which opens the said 1st screw hole in the said engagement state.

  According to this configuration, the projection optical apparatus is inserted through the opening of the support part, and the rotation with respect to the support part is restricted by the first screw inserted into the first screw hole of the end face described above. In other words, a structure that restricts the rotation of the projection optical device by the first screw using the outer peripheral wall forming the cylindrical portion is possible. Accordingly, it is possible to realize a configuration in which the projection optical apparatus can be supported by easy manufacturing while the projection optical apparatus is downsized as compared with the configuration in which the projection optical apparatus is provided with a flange portion having a screw hole.

  Application Example 3 In the projector according to the application example described above, the projector includes a plurality of the light modulation devices and a combining optical device that combines light modulated by the plurality of light modulation devices, and the projection optical device includes It is preferable that the light modulated by the combining optical device is projected, and the support unit has a combining device support unit that supports the combining optical device.

According to this configuration, it is possible to realize a structure that supports the projection optical apparatus and the combining optical apparatus more compactly with a smaller number of parts.
In addition, since the combining optical device and the projection optical device that projects the light combined by the combining optical device are supported by the support unit, the combining optical device and the projection are compared with the configuration in which each is supported by different members. It becomes possible to easily improve the relative positional accuracy with respect to the optical device. Therefore, it is possible to provide a projector that can perform projection with easy image quality and improved image quality.

  Application Example 4 In the projector according to the application example described above, the first screw is on the side opposite to the combining device support portion side of the combining optical device when viewed from the direction along the optical axis, and the combining optical device It is preferable that it is provided outside.

  According to this configuration, the first screw can be rotated from the outside in a unit state in which the projection optical device and the combining optical device are supported by the support portion. Therefore, the projection optical apparatus can be easily repaired or replaced while the combining optical apparatus is supported by the support portion.

  Application Example 5 In the projector according to the application example, the support mechanism includes a biasing unit that biases the projection optical device and the support unit in a direction away from each other in a direction along the optical axis. It is preferable that the engaging portion is in contact with the peripheral edge portion by the biasing force of the biasing portion.

  According to this configuration, the peripheral edge portion of the insertion hole and the engaging portion can be reliably brought into contact with each other at a predetermined portion. Therefore, the projection optical device can be prevented from falling with respect to the support portion, so that it is possible to reduce the shape tolerance of the peripheral portion of the insertion hole and the portion other than the predetermined portion in the engaging portion. Therefore, it is possible to provide a projector that projects an image with good image quality by arranging the projection optical device at a predetermined position with easy manufacture.

  Application Example 6 In the projector according to the application example described above, the biasing portion includes a base portion formed in an annular shape surrounding the optical axis, and a plurality of inner protrusion portions protruding from the inside of the base portion. The base portion abuts on one of the support portion and the lens housing, and the plurality of inner projecting portions abut on the other of the support portion and the lens housing so that the projection optical device and the support portion are It is preferable to energize.

  According to this configuration, the biasing unit includes the projection optical device and the support unit in which the annular base portion surrounding the optical axis is in contact with one of the support unit and the lens housing, and the plurality of inner protrusions are in contact with the other. Energize. As a result, the urging unit is integrated and configured, and the projection optical apparatus and the support unit can be urged in a well-balanced manner. Therefore, even in the configuration including the urging unit, it is possible to provide a projector that suppresses an increase in the number of components and suppresses the tilting of the projection optical apparatus with respect to the support unit with easy manufacture.

  Application Example 7 In the projector according to the application example described above, it is preferable that the support mechanism includes a second screw that fixes the support portion and the projection optical device.

  According to this configuration, the first screw and the second screw can reliably contact the peripheral portion of the insertion hole and the engaging portion at a predetermined portion. Therefore, the projection optical device can be prevented from falling with respect to the support portion, so that it is possible to reduce the shape tolerance of the peripheral portion of the insertion hole and the portion other than the predetermined portion in the engaging portion. Therefore, it is possible to provide a projector that projects an image with good image quality by arranging the projection optical device at a predetermined position with easy manufacture.

  Application Example 8 In the projector according to the application example described above, the plurality of lenses are a movable lens group that is movable along the optical axis, and a first lens that is located closest to the light incident side among the plurality of lenses. Preferably, the lens housing is a guide tube for guiding the movement of the movable lens group, and the first lens is fixed to the guide tube.

  According to this configuration, the member that stores the moving lens group and the member that stores the first lens are formed separately, and the number of components of the projection optical apparatus is reduced compared to a configuration in which the members are connected to each other. be able to. In addition, even if the engaging portion is provided in the vicinity of the first lens, an engaging portion having a strength that can be reliably engaged with the peripheral portion of the insertion hole while suppressing an increase in size in the vicinity of the engaging portion is formed. It becomes possible.

1 is a schematic diagram showing a schematic configuration of a projector according to a first embodiment. The perspective view of the subunit of 1st Embodiment. It is the disassembled perspective view of the subunit of 1st Embodiment, and the figure seen from diagonally forward. It is the disassembled perspective view of the subunit of 1st Embodiment, and the figure seen from back diagonally. The fragmentary sectional view of the subunit of 1st Embodiment. It is a fragmentary sectional view of the subunit of a 1st embodiment, and is a figure showing the 1st screw neighborhood. The disassembled perspective view of the subunit of 2nd Embodiment. The fragmentary sectional view of the subunit of 2nd Embodiment.

(First embodiment)
Hereinafter, the projector according to the present embodiment will be described with reference to the drawings.
The projector according to the present embodiment modulates light emitted from a light source according to image information, and enlarges and projects the modulated light onto a projection surface such as a screen.

[Main components of the projector]
FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector 1 according to the present embodiment.
As shown in FIG. 1, the projector 1 includes an exterior casing 2 that constitutes an exterior, a control unit (not shown), and an optical unit 3 having a light source device 31. Although not shown, a cooling device including a cooling fan and the like, a power supply device that supplies power to the control unit, the light source device 31, and the like are further arranged inside the exterior housing 2.

  Although detailed description is omitted, the exterior casing 2 is composed of a plurality of members, and is provided with an intake port for taking in outside air, an exhaust port for exhausting warm air inside the exterior housing 2 to the outside, and the like. .

  The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and functions as a computer. Control and so on.

The optical unit 3 optically processes and projects the light emitted from the light source device 31 under the control of the control unit.
As shown in FIG. 1, the optical unit 3 includes an integrator illumination optical system 32, a color separation optical system 33, a relay optical system 34, an electro-optical device 35, a projection lens 4 as a projection optical device, a support, in addition to the light source device 31. A mechanism 5 and an optical component casing 37 for arranging these members at predetermined positions on the optical path are provided.

The light source device 31 includes a discharge-type light source 311 composed of an ultrahigh pressure mercury lamp, a metal halide lamp, and the like, a reflector 312 and the like.
Although a detailed description is omitted, the light source 311 has a pair of electrodes arranged to face each other, and when electric power is supplied to the pair of electrodes, an arc discharge occurs between the electrodes to emit light. . The light source device 31 reflects the light emitted from the light source 311 by the reflector 312 and emits the light toward the integrator illumination optical system 32.

The integrator illumination optical system 32 includes lens arrays 321 and 322, a polarization conversion element 323, and a superimposing lens 324.
The lens array 321 has a configuration in which small lenses are arranged in a matrix, and divides the light emitted from the light source device 31 into a plurality of partial lights. The lens array 322 has substantially the same configuration as the lens array 321 and, together with the superimposing lens 324, partially overlaps a light modulation device 351 described later. The polarization conversion element 323 has a function of aligning random light emitted from the lens array 322 with polarized light that can be used by the light modulation device 351.

  The color separation optical system 33 includes dichroic mirrors 331 and 332, and a reflection mirror 333. The light emitted from the integrator illumination optical system 32 is red light (hereinafter referred to as “R light”), green light (hereinafter referred to as “G light”). And blue light (hereinafter referred to as “B light”).

  The relay optical system 34 includes an incident side lens 341, a relay lens 343, and reflection mirrors 342 and 344, and has a function of guiding the R light separated by the color separation optical system 33 to an R light light modulation device 351. The optical unit 3 has a configuration in which the relay optical system 34 guides the R light. However, the configuration is not limited thereto, and may be configured to guide the B light, for example.

The electro-optical device 35 is a light modulation device 351 provided for each color light (the light modulation device for R light is 351R, the light modulation device for G light is 351G, and the light modulation device for B light is 351B). , And a cross dichroic prism 352 as a combining optical device.
The light modulation device 351 includes a transmissive liquid crystal panel, an incident-side polarizing plate disposed on the light incident side of the liquid crystal panel, and an emission-side polarizing plate disposed on the light emission side of the liquid crystal panel. The light modulation device 351 has a rectangular pixel region in which a plurality of micro pixels (not shown) are formed in a matrix, modulates incident color light, and forms a display image of each color light in the pixel region.

  The cross dichroic prism 352 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. The cross dichroic prism 352 reflects the R light and B light modulated by the light modulation devices 351R and 351B, transmits the G light modulated by the light modulation device 351G, and synthesizes each color light.

  The projection lens 4 has a plurality of lenses arranged along the optical axis 4Ax, and enlarges and projects the light combined by the cross dichroic prism 352 onto the projection surface.

  The support mechanism 5 supports the cross dichroic prism 352 and the projection lens 4. The support mechanism 5 in a state where the cross dichroic prism 352 and the projection lens 4 are supported is a subunit 5U, and this subunit 5U is attached to the optical component casing 37 by screws (not shown) or the like. In the following, for convenience of explanation, in the projection lens 4, the light incident side (cross dichroic prism 352 side) is described as the rear side, and the light emission side is described as the front side. Further, the upper side of the state where the projector 1 is placed on a desk or the like is described as the upper side.

FIG. 2 is a perspective view of the subunit 5U, as viewed obliquely from the rear.
As will be described in detail later, the support mechanism 5 includes a support portion 6 and a first screw SC1 as shown in FIG.
The projection lens 4 is engaged with the support portion 6 by being rotated about the direction along the optical axis 4Ax, and the rotation is restricted by the first screw SC1 and supported by the support portion 6. The cross dichroic prism 352 is bonded and fixed to the support portion 6.

[Main configuration of projection lens]
Here, the projection lens 4 will be described. In addition, the figure shown below is a figure which showed the member which has a close relationship with the support mechanism 5 about the member which comprises the projection lens 4, and abbreviate | omitted the other member.
FIG. 3 is an exploded perspective view of the subunit 5U, as viewed obliquely from the front. FIG. 4 is an exploded perspective view of the subunit 5U, as viewed obliquely from the rear. FIG. 5 is a partial cross-sectional view of the subunit 5U, and shows the vicinity of the rear side of the projection lens 4.

In addition to a plurality of lenses, the projection lens 4 includes a guide cylinder 40 (see FIGS. 3 to 5) as a lens housing, and a cam cylinder and a focus cylinder (not shown).
The plurality of lenses includes a rear lens 4La (see FIG. 5) located on the rearmost side (light incident side, cross dichroic prism 352), and a plurality of moving lens groups and front lenses (not shown). Have.

The rear lens 4La is fixed in the vicinity of the rear end in the guide tube 40 by processing such as caulking of the guide tube 40. The rear lens 4La corresponds to a first lens.
Each of the plurality of moving lens groups is composed of one or a plurality of lenses, and each is held by a lens frame (not shown). This lens frame has a frame portion that holds the outer periphery of the moving lens group, and a plurality of cam pins that protrude from the frame portion. A plurality of moving lens groups, each of which is held by a lens frame, are arranged in the guide tube 40 and configured to be movable along the optical axis 4Ax.
The front lens is fixed in the focus cylinder.

The guide tube 40 is made of synthetic resin such as PC (polycarbonate) containing glass fiber. As shown in FIG. 3, the guide tube 40, the first protrusion 42 protruding from the tube 41, and the second A protrusion 43 is provided. The guide tube 40 is not limited to a synthetic resin and may be formed of a metal such as aluminum.
The cylindrical portion 41 has a large cylindrical portion 41A and a small cylindrical portion 41B, and houses a plurality of lenses.
A screw groove 411 is formed on the inner surface of the large cylindrical portion 41A. The small cylindrical portion 41B is provided on the rear side of the large cylindrical portion 41A, and has an outer diameter smaller than the outer diameter of the large cylindrical portion 41A.

In addition, the cylindrical portion 41 is formed with a plurality of rectilinear holes 412 formed along the optical axis 4Ax from the stepped portion formed by the large cylindrical portion 41A and the small cylindrical portion 41B toward the rear.
A plurality of rectilinear holes 412 are provided in the circumferential direction centered on the optical axis 4Ax, the cam pin described above is inserted, and the lens frame is prevented from rotating in the circumferential direction with respect to the optical axis 4Ax. Guide along axis 4Ax.

  The first protrusion 42 is provided behind the rectilinear hole 412 and extends along a circumferential direction centering on the optical axis 4Ax. As shown in FIG. 4, the rear surface of the first protrusion 42, that is, the end surface 42S opposite to the side on which the projection lens 4 projects light is formed flat. A first screw hole 421 is formed in the end surface 42S. The first screw hole 421 is provided at a lower portion of the end surface 42 </ b> S in an engaged state in which the projection lens 4 is engaged with the support portion 6.

  As shown in FIG. 4, the second protrusion 43 is provided in the vicinity of the rear lens 4La and spaced apart from the first protrusion 42 by a predetermined distance, and is intermittent in the circumferential direction about the optical axis 4Ax. Is formed. Three second protrusions 43 of the present embodiment are provided at intervals of approximately 120 ° in the circumferential direction around the optical axis 4Ax. One second projection 43 a among the three second projections 43 is positioned on the lower side in the engaged state of the projection lens 4. The second protrusion 43a is formed with a notch 431 that opens the first screw hole 421 when viewed from the rear. The inner diameter of the notch 431 is formed so as to allow the screw head of the first screw SC1 to pass therethrough. In addition, the number of the 2nd projection parts 43 is not limited to three, You may comprise by numbers other than three. The 1st projection part 42 and the 2nd projection part 43 are corresponded to the engaging part engaged with the peripheral part of the penetration hole 61H mentioned later of the support part 6. FIG.

  The cam cylinder (not shown) is formed in a cylindrical shape into which the small cylindrical portion 41B (see FIG. 3) is inserted, and is formed to be rotatable about the optical axis 4Ax with respect to the guide cylinder 40. The cam cylinder is formed to have a length that exposes the first protrusion 42 and the second protrusion 43 of the guide cylinder 40, and a cam groove that engages a cam pin protruding from the rectilinear hole 412 is formed on the inner surface. ing. When the cam cylinder is rotated with respect to the guide cylinder 40, the cam pin is guided by the rectilinear hole 412 and the cam groove to move the plurality of moving lens groups. In other words, the zoom of the projection lens 4 is adjusted by rotating the cam cylinder.

  A focus cylinder (not shown) is formed in a cylindrical shape and houses the front lens. On the outer surface of the focus tube, a screw groove that is screwed into a screw groove 411 (see FIG. 3) of the guide tube 40 is provided, and is configured to be rotatable with respect to the guide tube 40. The projection lens 4 is adjusted in focus by rotating the focus cylinder.

[Configuration of support mechanism]
Next, the support mechanism 5 will be described in detail.
As described above, the support mechanism 5 includes the support 6 and the first screw SC1 as shown in FIGS.
The support portion 6 is made of, for example, a synthetic resin such as PPS (Poly Phenylene Sulfide) containing reinforcing fibers, and the first support portion 61 that supports the projection lens 4 and the second support that supports the cross dichroic prism 352. A portion 62 is provided. The second support part 62 corresponds to a synthesis apparatus support part.

As shown in FIG. 3, the first support portion 61 is formed in a rectangular shape when viewed from the front, and has an insertion hole 61H provided in the center, an annular protrusion 611 protruding forward from the periphery of the insertion hole 61H, and an annular protrusion 611. It has the wall part 614 formed below.
The insertion hole 61H is a hole through which the rear side of the projection lens 4 is inserted, and is formed in a size that allows the first protrusion 42 of the projection lens 4 to rotate without backlash. A plurality of engaging protrusions 612 are formed on the peripheral edge of the insertion hole 61H.
The plurality of engagement protrusions 612 are formed on the rear side in the insertion hole 61H, and the second protrusions 43 are formed between the adjacent engagement protrusions 612 so as to pass therethrough. That is, three engagement protrusions 612 of the present embodiment are provided at intervals of approximately 120 ° in the circumferential direction centering on the optical axis 4Ax.

  In addition, one of the three engaging protrusions 612 is positioned on the lower side of the peripheral edge of the insertion hole 61H. The engaging protrusion 612a is formed with an opening 613 for opening the first screw hole 421 (see FIG. 4) when the projection lens 4 is engaged. The inner diameter of the opening 613 is larger than the outer diameter of the screw portion of the first screw SC1 and smaller than the outer diameter of the screw head of the first screw SC1. That is, the inner diameter of the opening 613 is smaller than the inner diameter of the notch 431 described above. In addition, when the 2nd protrusion part 43 is formed in numbers other than three, the engagement protrusion 612 is formed in the number according to the number.

  When the projection lens 4 is inserted into the insertion hole 61H and rotated so that the second protrusion 43 is positioned between the adjacent engagement protrusions 612, as shown in FIG. The first protrusion 42 and the second protrusion 43 are engaged and supported by the first support 61. Thus, the projection lens 4 is engaged with the peripheral edge of the insertion hole 61H by being rotated while being inserted into the insertion hole 61H. In addition, the projection lens 4 of this embodiment will be in an engagement state by rotating clockwise as seen from the front.

The first screw SC1 is inserted into the projection lens 4 from behind the support portion 6 in the engaged subunit 5U (see FIG. 2).
As shown in FIG. 5, in the projection lens 4, in the engaged state, the first protrusion 42 is positioned in front of the engagement protrusion 612, and the second protrusion 43 is positioned behind the engagement protrusion 612. . That is, the subunit 5U is formed such that the opening 613 is exposed from the notch 431 (see FIG. 4) and the first screw hole 421 is exposed from the opening 613 before the first screw SC1 is inserted. ing.

  Then, the first screw SC1 is inserted into the first screw hole 421 of the first protrusion 42 from the opening 613 exposed from the notch 431. As a result, the rotation of the projection lens 4 into which the first screw SC1 is inserted with respect to the support portion 6 is restricted. The first screw SC1 is inserted into the first screw hole 421 when the first screw hole 421 has a screw groove and the first screw SC1 is screwed into the screw groove, or first The screw hole 421 is formed in a round hole, and the first screw SC1 configured as a tapping screw enters the round hole by being rotated.

As shown in FIG. 5, the second support part 62 extends rearward from the upper side of the first support part 61, and has a plane 621 that is positioned above the optical axis 4 </ b> Ax and parallel to the optical axis 4 </ b> Ax. ing.
The cross dichroic prism 352 is fixed to the flat surface 621 with an adhesive.

FIG. 6 is a partial cross-sectional view of the subunit 5U, showing the vicinity of the first screw SC1.
As shown in FIGS. 2 and 6, the first screw SC <b> 1 is disposed below the cross dichroic prism 352 when viewed from the rear. As described above, the first screw SC1 is provided on the outer side of the cross dichroic prism 352 when viewed from the direction along the optical axis 4Ax on the side opposite to the second support portion 62 with the optical axis 4Ax interposed therebetween. That is, the first screw SC1 is provided at a position where the screw can be tightened and loosened in the state of the subunit 5U.

As described above, according to the present embodiment, the following effects can be obtained.
(1) When the projection lens 4 is rotated in a state of being inserted through the insertion hole 61H, the projection lens 4 is brought into an engaged state, and in this engaged state, the rotation with respect to the support portion 6 is restricted by the first screw SC1. Fixed to. Accordingly, it is possible to provide the projector 1 that can arrange the projection lens 4 at a predetermined position with a small number of parts and easy manufacture.

  (2) A first screw hole 421 is provided in the guide tube 40, and the first screw SC1 is inserted into the first screw hole 421 from the side opposite to the side on which the projection lens 4 projects light. As a result, a configuration in which the projection lens 4 can be supported with easy manufacturing while the projection lens 4 is formed in a smaller size as compared with the configuration in which the projection lens 4 is provided with a flange portion having a screw hole.

(3) Since the support portion 6 has the second support portion 62 that supports the cross dichroic prism 352, a structure that supports the projection lens 4 and the cross dichroic prism 352 more compactly with a small number of parts is realized. It becomes possible to do.
Further, since the cross dichroic prism 352 and the projection lens 4 for projecting the light synthesized by the cross dichroic prism 352 are supported by the support portion 6, the cross dichroic prism is compared to a configuration in which each is supported by different members. It is possible to easily improve the relative positional accuracy between the prism 352 and the projection lens 4. Therefore, it is possible to provide the projector 1 that can perform projection with easy image quality and improved image quality.

  (4) The first screw SC1 is provided at a position where the screw can be tightened and loosened in the state of the subunit 5U. Thus, the projection lens 4 can be easily repaired or replaced while the cross dichroic prism 352 is supported by the support portion 6.

  (5) The rear lens 4La is fixed to the guide tube 40 in which the moving lens group is accommodated. As a result, the projection lens is compared with a configuration in which the member that stores the moving lens group and the member that stores the rear lens 4La are formed separately and the respective members are connected to each other (configuration different from the present embodiment). 4 can be reduced. In addition, even if the second protrusion 43 is provided in the vicinity of the rear lens 4La, the second protrusion 43 has a strength that can be reliably engaged with the engagement protrusion 612 while suppressing an increase in size in the vicinity of the second protrusion 43. The protrusion 43 can be formed.

(Second Embodiment)
Hereinafter, the projection lens 7 and the support mechanism 8 according to the second embodiment will be described with reference to the drawings. In the following description, the same components as those of the projection lens 4 and the support mechanism 5 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
The support mechanism 8 supports the cross dichroic prism 352 and the projection lens 7. The support mechanism 8 in a state where the cross dichroic prism 352 and the projection lens 7 are supported is a subunit 8U.

FIG. 7 is an exploded perspective view of the subunit 8U, as viewed obliquely from the front.
As shown in FIG. 7, the projection lens 7 includes a guide tube 70 having a shape different from that of the guide tube 40 included in the projection lens 4 of the first embodiment. The support mechanism 8 further includes an urging portion 100 in addition to the support portion 9 having a shape different from that of the support portion 6 included in the support mechanism 5 of the first embodiment and the first screw SC1.

  The guide tube 70 has a first protrusion 72 in which the first protrusion 42 (see FIG. 3) of the guide tube 40 is partially cut away. This notched portion is defined as a notch 72N. Three first protrusions 72 of the present embodiment are provided at an interval of approximately 120 ° in the circumferential direction about the optical axis 7Ax of the projection lens 7. The notch 72N is formed so that an inner projecting portion 120 (to be described later) of the urging portion 100 can pass when the subunit 8U is assembled.

The urging unit 100 urges the projection lens 7 and the support unit 9 in a direction away from each other in the direction along the optical axis 7Ax. The urging portion 100 is formed by press working from a plate material such as stainless steel, for example, and as shown in FIG. 7, a base portion 110 formed in an annular shape surrounding the optical axis 7 </ b> Ax, and an inner side protruding from the inside of the base portion 110 A protrusion 120 is provided.
The base portion 110 has an inner diameter through which the first protrusion 72 can be inserted, and is formed in a size that can contact the end surface of the annular protrusion 611 of the support portion 9. The base portion 110 has three outer protrusions 111 that are provided at equal intervals in the circumferential direction and protrude outward.

Three inner protrusions 120 are provided at intervals of approximately 120 ° in the circumferential direction centered on the optical axis 7Ax, and are formed so as to be able to pass through the notches 72N of the guide tube 70 as described above. The outer protrusions 111 are provided corresponding to the three inner protrusions 120, respectively, and protrude to the opposite side of the inner protrusions 120.
A slit 100N is provided between the base portion 110 and the inner protruding portion 120 of the urging portion 100, and the inner protruding portion 120 is formed to be able to bend with respect to the base portion 110. In addition, a convex portion 121 that protrudes rearward is formed substantially at the center of the inner protruding portion 120.

As shown in FIG. 7, the support unit 9 includes a first support unit 91 that supports the projection lens 7 and a second support unit 92 that supports the cross dichroic prism 352. In addition, the 2nd support part 92 has a shape substantially the same as the 2nd support part 62 of 1st Embodiment.
The 1st support part 91 has the energizing part engagement projection 911 which the 1st support part 61 (refer to Drawing 3) of a 1st embodiment does not have.
Three urging portion engaging protrusions 911 are provided on the outer side of the annular protrusion 611 at intervals of approximately 120 ° in the circumferential direction centered on the optical axis 7Ax, and the outer protrusions 111 of the urging portion 100 are disposed on the inner side. It is formed to be. Of the three urging portion engaging protrusions 911, one urging portion engaging protrusion 911a is positioned on the lower side of the peripheral edge of the insertion hole 61H.

Specifically, the urging portion engaging protrusion 911 will be described by paying attention to the urging portion engaging protrusion 911a. FIG. 8 is a partial cross-sectional view of the subunit 8U in the engaged state, showing the vicinity of the urging portion engaging protrusion 911a.
As shown in FIGS. 7 and 8, the urging portion engaging protrusion 911a includes a bottom portion 911x that protrudes forward along the wall portion 614, a front wall 911y that protrudes upward from the bottom portion 911x, and a front wall as viewed from the front. It has a side wall 911z extending backward from the left end portion of 911y. Thus, the biasing portion engaging projection 911a has the front wall 911y positioned in front of the end surface of the annular projection 611, and the side facing the side wall 911z is open. That is, the biasing portion engaging protrusion 911a is provided with the side wall 911z on the downstream side in the clockwise direction when viewed from the front, and the upstream side is open.
Also in the urging portion engaging protrusions 911 other than the urging portion engaging protrusion 911a, a side wall 911z is provided on the downstream side in the clockwise direction when viewed from the front, and the upstream side is open.

  The urging unit 100 is temporarily disposed on the support unit 9 from the front of the first support unit 91. Specifically, when viewed from the front, the urging unit 100 is temporarily disposed on the support unit 9 by being rotated clockwise in a state where each outer protrusion 111 is positioned on the right side of each front wall 911y. In the tentatively arranged state, the urging portion 100 has the base portion 110 positioned between the front wall 911y and the annular protrusion 611 in the front-rear direction, and the end surface of the outer protrusion 111 contacts the bottom portion 911x in the up-down direction. The drop-out from the support portion 9 is prevented.

The projection lens 7 is inserted into the insertion hole 61 </ b> H and rotated and engaged with the support portion 9 in the state where the urging portion 100 is temporarily disposed on the support portion 9, as described in the first embodiment. The engaged state is established.
Specifically, when the projection lens 7 is inserted into the insertion hole 61H until the first protrusion 72 comes into contact with the engagement protrusion 612, the biasing part 100 has the inner protrusion 120 passing through the notch 72N, and the base The portion 110 is disposed on the front side of the first protrusion 72. Thereafter, when the projection lens 7 is rotated, the rotation of the urging unit 100 is restricted by the outer projection 111 coming into contact with the side wall 911z, so that the inner projection 120 does not rotate with the projection lens 7 and the first projection 120 does not rotate. It faces the front surface of the protrusion 72. Thereafter, when the projection lens 7 is further rotated, as shown in FIG. 8, when the projection lens 7 is rotated, the projection 121 comes into contact with the first projection 72 and the projection lens 7 is rotated to a predetermined position. The second protrusion 43 engages with the engagement protrusion 612 to be in an engaged state.

  The urging portion 100 urges the projection lens 7 and the support portion 9 in a direction away from each other because the outer protrusion 111 is restricted from moving forward by the front wall 911y. Specifically, as shown in FIG. 8, the urging portion 100 has a base portion 110 (outer protrusion 111) that urges the support portion 9 (front wall 911 y) forward from the rear, and a plurality of inner protrusions 120. The (convex portion 121) biases the projection lens 7 (first projecting portion 72) backward from the front. Then, the projection lens 7 and the support portion 9 are surely brought into contact with the rear surface of the first projection 72 and the front surface of the engagement projection 612 (see FIG. 7) by the biasing force of the biasing portion 100.

  In the projection lens 7, as in the projection lens 4 of the first embodiment, the first screw SC1 is inserted in the engaged state, and the rotation with respect to the support portion 9 is restricted.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Since the support mechanism 8 includes the urging portion 100, the engagement protrusion 612 and the first protrusion 72 are arranged at predetermined portions (the front surface of the engagement protrusion 612 and the rear surface of the first protrusion 72). It becomes possible to make it contact | abut reliably. Therefore, since the tilting of the projection lens 7 with respect to the support portion 9 can be suppressed, it is possible to reduce the shape tolerance of parts other than the predetermined part. Therefore, it is possible to provide the projector 1 that projects the image with good image quality by arranging the projection lens 7 at a predetermined position with easy manufacture.

  (2) The urging portion 100 includes an annular base portion 110 that contacts the support portion 9 and a plurality of inner protrusions 120 that contact the guide tube 70. Thus, the urging unit 100 can be integrated and configured, and the projection lens 7 and the support unit 9 can be urged in a well-balanced manner. Therefore, even if it is a structure provided with the urging | biasing part 100, the increase in the number of parts can be suppressed and the projector 1 which suppressed the fall of the projection lens 7 with respect to the support part 9 by easy manufacture can be provided.

  (3) Since the support part 9 has the urging | biasing part engaging protrusion 911 which temporarily arrange | positions the urging | biasing part 100, the urging | biasing part 100 can be easily arrange | positioned in a predetermined position.

(Modification)
Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

  The support mechanisms 5 and 8 of the above embodiment are configured to support the cross dichroic prism 352 and the projection lenses 4 and 7, but support the projection lenses 4 and 7 without supporting the cross dichroic prism 352. A support mechanism may be configured.

  In addition to the constituent members of the support mechanism 5 of the first embodiment, a support mechanism including a second screw (not shown) that fixes the support unit 6 and the projection lens 4 may be configured. For example, a second screw hole is provided in the end surface 42S of the guide tube 40, an opening for opening the second screw hole is provided in the support portion 6, and the second screw inserted through the opening is inserted into the second screw hole. It may be configured.

  In the projection lens 7 and the support mechanism 8 according to the second embodiment, the annular base portion 110 abuts on the support portion 9, and the inner projecting portion 120 that can be bent with respect to the base portion 110 abuts on the guide tube 70. 7 and the support portion 9 are configured to be biased, but the configuration is not limited thereto. For example, an urging portion having an annular portion and a plurality of flexible portions capable of bending with respect to the annular portion is configured, and the annular portion abuts on the guide tube, and the plurality of flexible portions abut on the support portion and projects. You may comprise so that a lens and a support part may be urged | biased.

In the projector 1 of the embodiment, a transmissive liquid crystal panel is used as the light modulation device 351. However, a reflective liquid crystal panel may be used.
In addition, the light modulation device 351 of the above embodiment employs a so-called three-plate method using three light modulation devices corresponding to R light, G light, and B light. A plate method may be adopted, or the present invention can be applied to a projector including two or four or more light modulation devices.
Further, a micromirror type light modulation device such as a DMD (Digital Micromirror Device) may be used as the light modulation device.

  The light source device 31 of the embodiment uses the discharge-type light source 311, but may be configured by other types of light sources, solid-state light sources such as light emitting diodes and lasers.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 4, 7 ... Projection lens (projection optical apparatus), 4Ax, 7Ax ... Optical axis, 4La ... Rear side lens (1st lens), 5, 8 ... Support mechanism, 6, 9 ... Support part, 40, 70 ... Guide tube (lens housing), 41 ... Cylindrical portion, 42,72 ... First protrusion (engagement portion), 43, 43a ... Second protrusion (engagement portion), 61, 91 ... first Support part, 61H ... insertion hole, 62, 92 ... second support part (synthesizer support part), 100 ... biasing part, 110 ... base part, 120 ... inner protrusion part, 311 ... light source, 351, 351B, 351G, 351R: Light modulation device, 352: Cross dichroic prism (synthetic optical device), 421: First screw hole, 612, 612a: Engagement projection, 613: Opening, SC1: First screw

Claims (8)

A light source;
A light modulation device for modulating light emitted from the light source;
A projection optical device for projecting light modulated by the light modulation device;
An insertion hole through which the projection optical device is inserted, and a support mechanism for supporting the projection optical device,
The projection optical device includes:
A plurality of lenses arranged along the optical axis;
A cylindrical portion that houses the plurality of lenses, and a projection that protrudes from the cylindrical portion and engages with a peripheral portion of the insertion hole by rotating the projection optical device in a state of being inserted into the insertion hole. A lens housing having a joint part;
With
The support mechanism is
A support portion having the insertion hole;
A first screw that is inserted into the support portion or the lens housing in an engaged state in which the engagement portion is engaged with the peripheral portion, and restricts the rotation of the projection optical apparatus with respect to the support portion;
A projector comprising: The projector according to claim 1,
The cylindrical portion has a first screw hole into which the first screw is inserted into an end surface opposite to a side on which the projection optical device projects light,
The projector has an opening for opening the first screw hole in the engaged state. The projector according to claim 1 or 2, wherein
A plurality of the light modulation devices, and a combining optical device that combines light modulated by the plurality of light modulation devices,
The projection optical device projects light modulated by the combining optical device;
The projector according to claim 1, wherein the support unit includes a synthesis device support unit that supports the synthesis optical device. The projector according to claim 3,
The projector is characterized in that the first screw is provided outside the synthesizing optical device on the side opposite to the synthesizing device support part side of the synthesizing optical device when viewed from the direction along the optical axis. . It is a projector as described in any one of Claims 1-4, Comprising:
The support mechanism includes a biasing portion that biases the projection optical device and the support portion in a direction away from each other in a direction along the optical axis.
The said engaging part is contact | abutted to the said peripheral part with the urging | biasing force of the said urging | biasing part, The projector characterized by the above-mentioned. The projector according to claim 5, wherein
The biasing part is
An annular base portion surrounding the optical axis;
A plurality of inner protrusions protruding from the inside of the base portion;
Have
The base portion abuts one of the support portion and the lens housing, and the plurality of inner projecting portions abuts the other of the support portion and the lens housing to urge the projection optical device and the support portion. A projector characterized by that. It is a projector as described in any one of Claims 1-4, Comprising:
The projector is characterized in that the support mechanism includes a second screw for fixing the support portion and the projection optical device. It is a projector as described in any one of Claims 1-7, Comprising:
The plurality of lenses include a moving lens group movable along the optical axis, and a first lens located closest to the light incident side among the plurality of lenses,
The lens housing is a guide tube for guiding the movement of the moving lens group,
The projector according to claim 1, wherein the first lens is fixed to the guide tube.

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