JP6036861B2 - Projection optical device and projector - Google Patents

Description

  The present invention relates to a projection optical apparatus and a projector.

  2. Description of the Related Art Conventionally, a projector is known that includes a light source, a light modulation device that modulates light emitted from the light source according to image information, and a projection optical device that projects light modulated by the light modulation device. The projection optical apparatus has a plurality of lens groups. A projection lens (projection optical device) having a lens group configured to be movable along the optical axis among a plurality of lens groups has been proposed (for example, see Patent Document 1).

The projection lens described in Patent Document 1 includes a guide tube having a straight groove, a cam tube having a cam groove, a first lens group to a seventh lens group, and a plurality of lens frames. Among the plurality of lens frames are a front lens frame that holds the fourth lens group, an intermediate lens frame that holds the fifth lens group, and a rear lens frame that holds the sixth lens group. The intermediate lens frame is disposed between the front lens frame and the rear lens frame, and the rear lens frame is fixed to the front lens frame.
Each of the front lens frame and the intermediate lens frame has a cam pin that engages with the cam groove, and the cam pin is disposed to be supported by the cam groove. In the direction along the optical axis, the front lens frame has a cam pin formed on one side across the intermediate lens frame, holds the fourth lens group near the cam pin, and the rear lens frame is fixed on the other side. ing.
When the cam barrel is rotated, the front lens frame and the intermediate lens frame are guided by the straight advance groove and the cam groove and move independently of each other. Since the rear lens frame is fixed to the front lens frame, the front lens frame and the rear lens frame move together while holding the fourth lens group and the sixth lens group, respectively.

JP 2010-107703 A

However, in the projection lens described in Patent Document 1, the front lens frame and the rear lens frame may be inclined with respect to the optical axis. That is, the front lens frame, the fourth lens group, the rear lens frame, and the sixth lens group that move integrally are arranged with the cam pin of the front lens frame supported by the cam groove, and the center of gravity of these members is the optical axis. It is considered that the rear lens frame is closer to the cam pin than the cam pin. Since the cam pin and the rear lens frame are arranged apart from each other by an amount exceeding the movement amount of the intermediate lens frame in the direction along the optical axis, the cam pin position and the center of gravity position are in the direction along the optical axis. It is considered that there is a large deviation. Therefore, the front lens frame and the rear lens frame may be inclined so that the rear lens frame side is lowered.
When the front lens frame and the rear lens frame are tilted, the fourth lens group and the sixth lens group are also tilted with respect to the optical axis, so that the projected image is distorted. When the weight of the sixth lens group is larger than the weight of the fourth lens group, the cam pin position and the center of gravity position are further separated from each other, so that the inclination becomes more remarkable and the front lens frame and the rear lens frame are smooth. There is also a problem that it becomes difficult to move to.

  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 projection optical apparatus according to this application example is a projection optical apparatus having a plurality of movable lens groups that are sequentially arranged from one side of the optical axis toward the other side, and the plurality of lenses. A plurality of lens frames each holding a group and having a cam pin protruding in a direction perpendicular to the optical axis, and a guide cylinder having a rectilinear groove along the optical axis, the cam pin being inserted into the rectilinear groove And a cam groove that engages with the cam pin protruding from the rectilinear groove, and is rotated with respect to the guide cylinder so that the cam pin is moved between the rectilinear groove and the cam groove. And a cam cylinder that moves the plurality of lens frames along the optical axis, and at least one lens frame of the plurality of lens frames is inserted into a lens frame adjacent to the one side. Insert section and guide A protruding lens frame having a frame insertion portion to be inserted into the guide tube, and the protruding lens frame slides relative to the guide tube on at least one of the inner surface of the guide tube and the outer surface of the frame insertion portion. A sliding protrusion that abuts on the surface is formed.

  According to this configuration, in the protruding lens frame of the plurality of lens frames, the insertion portion is inserted into the lens frame adjacent to one side, the frame insertion portion is inserted into the guide tube, and the cam pin is a cam of the cam tube. It is disposed in engagement with the groove. The protruding lens frame moves along the optical axis by the rotation of the cam cylinder. Since the protruding lens frame slides in contact with the guide tube by the sliding protrusion, even if the cam pin is provided at a position away from the center of gravity including the protruding lens frame and the lens group held by the protruding lens frame, the light Tilt with respect to the axis is suppressed. Therefore, the inclination of the lens group held by the protruding lens frame can be suppressed with a space-saving and simple configuration. Therefore, while suppressing the complexity and size reduction of the structure and the structural members (for example, downsizing in the direction along the optical axis of the cam cylinder) and reducing the weight (for example, reducing the weight due to the downsizing of the cam cylinder). Therefore, it is possible to provide a projection optical device that suppresses image distortion and projects an image with good image quality. In addition, since the tilt of the protruding lens frame is suppressed, the protruding lens frame can be smoothly moved. In the configuration in which the cam cylinder is manually rotated, the operation force can be reduced, In the configuration in which the cam cylinder is rotated, power can be reduced.

  Application Example 2 In the projection optical apparatus according to the application example described above, the plurality of lens groups includes a leading lens group disposed closest to the one side among the plurality of lens groups, and the other side of the leading lens group. It is preferable that a plurality of the rear lens groups sequentially disposed in the plurality of lens frames that respectively hold the plurality of rear lens groups are the protruding lens frames.

  According to this configuration, since the lens frames that respectively hold the plurality of subsequent lens groups are protruding lens frames, the lens frame moves while the inclination with respect to the optical axis is suppressed by the sliding protrusions. This makes it possible to suppress the inclination of the plurality of subsequent lens groups with respect to the optical axis with a simple configuration.

  Application Example 3 In the projection optical apparatus according to the application example described above, the projection lens frame having the sliding protrusion and the lens frame into which the insertion portion of the protruding lens frame having the sliding protrusion is inserted. It is preferable that an insertion part for abutting the sliding projection with the guide tube is formed.

  According to this configuration, the lens frame into which the insertion portion of the protruding lens frame having the sliding protrusion is inserted is provided with the insertion portion that makes the sliding protrusion contact the guide tube. As a result, the protruding lens frame can form a sliding protrusion at a position closer to the insertion portion than the cam pin. Therefore, when the lens group is arranged in the insertion portion, the center of gravity including the protruding lens frame and the lens group held by the protruding lens frame is considered to be in the vicinity of the lens group. On the other hand, a sliding projection can be provided at a position closer to the cam pin, and the tilt of the protruding lens frame with respect to the optical axis can be efficiently suppressed.

  Application Example 4 In the projection optical apparatus according to the application example described above, it is preferable that the projection lens frame includes the protruding lens frames on both sides of the cam pin in the direction along the optical axis.

  According to this configuration, the protruding lens frame abuts on the guide tube so that both sides of the cam pin supported by the cam groove can slide. Further, the protruding lens frame comes into contact with the guide cylinder so that a plurality of positions can slide in the direction along the optical axis. Thereby, it is possible to further suppress the inclination of the protruding lens frame with respect to the optical axis.

  Application Example 5 In the projection optical apparatus according to the application example, it is preferable that the sliding protrusion is intermittently formed in a circumferential direction centering on the optical axis.

  According to this configuration, compared to a configuration in which the sliding projection is formed over the entire circumference around the optical axis, the mold structure for forming the sliding projection is simplified and the size of the sliding projection is reduced. Mold processing for fine adjustment is facilitated.

  Application Example 6 In the projection optical apparatus according to the application example described above, it is preferable that the projection optical apparatus further includes a reflection unit that reflects light on one side of the plurality of lens groups.

  According to this configuration, it is possible to change the direction of light from a plurality of lens groups and to widen the angle by the reflecting portion. Therefore, it is possible to provide a projection optical device that is arranged close to the projection surface and can be widened.

  Application Example 7 In the projection optical apparatus according to the application example, it is preferable that the plurality of lens groups are lens groups that contribute to focus adjustment.

  According to this configuration, since the tilt of the lens group that contributes to focus adjustment with respect to the optical axis is suppressed, even when focus adjustment is performed, an increase in optical aberration is suppressed, and projection optics that projects an image with good image quality An apparatus can be provided.

  Application Example 8 A projector according to this application example projects a light source, a light modulation device that modulates light emitted from the light source according to image information, and the light modulated by the light modulation device. And a projection optical apparatus according to any one of the above.

  According to this configuration, since the projector includes the above-described projection optical device, the projector can be miniaturized and can project an image with good image quality by suppressing distortion of light modulated by the light modulation device. .

FIG. 3 is a schematic diagram illustrating an example of a usage pattern of the projector according to the present embodiment. 1 is a schematic diagram showing a schematic configuration of a projector according to an embodiment. The perspective view of the projection optical apparatus of this embodiment. FIG. 3 is a cross-sectional view of the projection optical apparatus of the present embodiment. The disassembled perspective view of the 1st optical system of this embodiment. The perspective view of the 1st lens frame of this embodiment, the 2nd lens frame, and the 3rd lens frame. Sectional drawing of the 1st optical system of this embodiment. Sectional drawing which looked at the 1st optical system of this embodiment from the -Y side. The perspective view of the guide cylinder and urging | biasing part of this embodiment.

Hereinafter, the projector according to the present embodiment will be described with reference to the drawings.
The projector according to the present embodiment is configured to be able to project an image on a projection surface such as a screen while being supported by a support installed on a wall surface or the like, or being placed on a desk or the like.
FIG. 1 is a schematic diagram illustrating an example of a usage pattern of the projector 1 according to the present embodiment. Specifically, FIG. 1 is a diagram schematically showing the projector 1 supported by the support Mt installed on the wall surface and the screen SC arranged on the wall surface.
As shown in FIG. 1, the projector 1 is installed above the screen SC, and projects an image onto the screen SC from the side facing downward. In the following, for convenience of explanation, in the projector 1 supported by the support Mt, the direction toward the wall surface is defined as the forward direction (+ Y direction) and the direction against gravity is defined as the normal direction to the wall surface (screen SC). The upper direction (+ Z direction) and the right side toward the wall surface are described as the right direction (+ X direction). In addition, the projector according to the present embodiment is configured to project an image even when the + Y side or the + Z side in the posture illustrated in FIG. 1 is placed on a desk or a floor.

[Main components of the projector]
FIG. 2 is a schematic diagram illustrating a schematic configuration of the projector 1 according to the present embodiment.
As shown in FIG. 2, the projector 1 includes an exterior housing 2 constituting an exterior, a control unit (not shown), an optical unit 3 having a light source device 31, and an imaging device 4. Although not shown, a power supply device that supplies power to the light source device 31 and the control unit, and a cooling device that cools the optical unit 3 and the like are further arranged inside the exterior housing 2.

  Although detailed description is omitted, the exterior housing 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, and is related to control of the operation of the projector 1, for example, image projection. 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. 2, in addition to the light source device 31, the optical unit 3 includes an integrator illumination optical system 32, a color separation optical system 33, a relay optical system 34, an optical device 35, a projection optical device 5, and these optical components. An optical component casing 37 is provided at a predetermined position on the optical path.

  The light source device 31 includes a discharge-type light source 311, a reflector 312, a collimating lens 313, and the like composed of an ultra-high pressure mercury lamp, a metal halide lamp, or the like. The light source device 31 reflects the light emitted from the light source 311 by the reflector 312, aligns the emission direction by the collimating lens 313, and emits the light toward the integrator illumination optical system 32.

The integrator illumination optical system 32 includes a first lens array 321, a second lens array 322, a polarization conversion element 323, and a superimposing lens 324.
The first 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 second lens array 322 has substantially the same configuration as the first lens array 321, and together with the superimposing lens 324, the partial light is substantially superimposed on the surface of a liquid crystal panel described later. The polarization conversion element 323 has a function of aligning random light emitted from the second lens array 322 with substantially one type of polarized light that can be used in the liquid crystal panel.

  The color separation optical system 33 includes two 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 “light”). 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 a liquid crystal panel for R light. 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 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 color synthesizing optical device.
Each 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 emitting side of the liquid crystal panel, and each color light is imaged. Modulate according to information.

  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. In the cross dichroic prism 352, the dielectric multilayer film reflects R light and B light modulated by the light modulation devices 351R and 351B, and transmits G light modulated by the light modulation device 351G. Synthesize modulated light.

  As will be described in detail later, the projection optical apparatus 5 includes a first optical system 6 having an optical axis Ax and a second optical system 7 that reflects light emitted from the first optical system 6. Then, the projection optical device 5 enlarges and projects the light combined by the cross dichroic prism 352 onto the screen SC disposed below the projector 1 as shown in FIG.

  The imaging device 4 includes, for example, an imaging device (not shown) such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), images the projection plane, and outputs the captured information to the control unit. Further, the imaging device 4 detects light emitted from an pointing tool (for example, an electronic pen or the like) operated on the projection plane by the user, and outputs the detected information to the control unit. The control unit analyzes the position of the pointing tool based on the information output from the imaging device 4, and projects the locus of the pointing tool, for example, as an image represented by dots or lines based on the analysis result.

[Configuration of projection optical device]
Here, the projection optical apparatus 5 will be described in detail.
FIG. 3 is a perspective view of the projection optical apparatus 5 and shows a state in which a cover 51B described later is removed. FIG. 4 is a cross-sectional view on the YZ plane including the optical axis Ax of the projection optical apparatus 5.
As shown in FIGS. 3 and 4, the projection optical device 5 includes a first optical system 6 having a plurality of lens groups each having one or a plurality of lenses arranged along the optical axis Ax as one lens group. And a second optical system 7 that reflects the light emitted from the first optical system 6. As shown in FIG. 1, in the projector 1 supported by the support Mt installed on the wall surface, the direction along the optical axis Ax is the ± Y direction, and the first optical system 6 has a cross dichroic prism 352. The light incident side (upstream side of the optical path) on which the combined light is incident is the + Y side, and the light exit side (downstream side of the optical path, the second optical system 7 side) from which the light is emitted is the -Y side.

As shown in FIG. 4, the projection optical device 5 includes a projection optical casing 51 and a translucent plate 53 in addition to the first optical system 6 and the second optical system 7.
FIG. 5 is an exploded perspective view of the first optical system 6.
As shown in FIGS. 4 and 5, the first optical system 6 is arranged in order from the light exit side (−Y side) to the light incident side (+ Y side) along the optical axis Ax. L1 to a fourth lens group L4, a first lens frame 61 to a fourth lens frame 64 that respectively hold the first lens group L1 to the fourth lens group L4, a guide cylinder 65, a cam cylinder 66, and an urging portion 67. .

  Specifically, the first lens unit L1 includes one lens, and is arranged on the most light emission side (−Y side) among the plurality of movable lens groups in the first optical system 6. Further, one lens constituting the first lens unit L1 is formed of a synthetic resin aspheric lens, and a part on the −Z side and a part on both the left and right sides are deleted from the circular shape in plan view. It has a different shape. The second lens group L2, the third lens group L3, and the fourth lens group L4 are each composed of a plurality of lenses, and are arranged in this order on the light incident side (+ Y side) of the first lens group L1. The second lens unit L2 has a shape in which a part on the −Z side is deleted from a circular shape in plan view.

The first lens frame 61 includes a cylindrical holding portion 611 that holds the first lens unit L1, and a plurality of cam pins 61p that protrude from the holding portion 611 in a direction orthogonal to the optical axis Ax.
The second lens frame 62 includes a cylindrical holding portion 621 that holds the second lens group L2, and a plurality of cam pins 62p that protrude from the holding portion 621 in a direction orthogonal to the optical axis Ax.
The third lens frame 63 includes a cylindrical holding portion 631 that holds the third lens unit L3, and a plurality of cam pins 63p that protrude from the holding portion 631 in a direction orthogonal to the optical axis Ax.
Each of the cam pins 61p, 62p, and 63p is provided at approximately equal intervals of 120 ° in the circumferential direction centered on the optical axis Ax, and the tip end portion is formed in a tapered shape with a narrow edge portion. The length is set such that the portion protrudes from a rectilinear groove 651 described later of the guide tube 65.
The fourth lens frame 64 is formed in a cylindrical shape, holds the fourth lens unit L4, and is fixed to the guide cylinder 65.

  As described above, the projection optical device 5 includes the movable first lens groups L1 to L3 that are sequentially arranged from the light emitting side that is one side of the optical axis Ax toward the light incident side that is the other side of the optical axis. A lens group L3 and a fourth lens group L4 fixed to the guide tube 65 are provided. The first lens unit L1 corresponds to a leading lens unit disposed on the most one side of the optical axis Ax among the movable first lens unit L1 to third lens unit L3, and includes the second lens unit L2 and the third lens unit L2. The lens group L3 corresponds to a rear lens group that is sequentially arranged on the other side (light incident side) of the head lens group.

  The guide tube 65 is made of synthetic resin, has an opening in the front-rear direction (± Y direction), and as shown in FIGS. 4 and 5, a cylindrical insertion portion 65 </ b> A that is inserted into the cam tube 66. It has a cylindrical tube protruding portion 65B provided on the −Y side of the fitting insertion portion 65A, and a cylindrical attachment portion 65C provided on the + Y side of the fitting insertion portion 65A.

The cylinder projecting portion 65B has an outer diameter larger than the outer diameter of the fitting insertion portion 65A, and is formed to protrude from the cam cylinder 66 to the −Y side. As shown in FIG. 5, the fitting insertion portion 65A is provided with three rectilinear grooves 651 along the optical axis Ax from the stepped portion formed by the fitting insertion portion 65A and the cylinder protruding portion 65B toward the + Y direction. ing.
The inner diameter of the fitting insertion portion 65A is set to a size that allows the holding portions 631, 621, and 611 to be inserted, and the inner diameter of the cylindrical protruding portion 65B is the third lens frame 63, the second lens frame 62, and the first lens frame 61. Each of them is set to a size that can be inserted.
The mounting portion 65C has an outer diameter smaller than the outer diameter of the fitting insertion portion 65A, and is formed so as to protrude from the cam cylinder 66 to the + Y side.

  The 3rd lens frame 63, the 2nd lens frame 62, and the 1st lens frame 61 are inserted from the cylinder protrusion part 65B in this order. Specifically, in the third lens frame 63, the second lens frame 62, and the first lens frame 61, the cam pins 63p, 62p, 61p are inserted into the rectilinear grooves 651, and the holding portions 631, 621, 611 are inserted into the fitting insertion portion 65A. Inserted. Although the detailed description is omitted, the fourth lens frame 64 is fixed to the attachment portion 65C via a member. The guide tube 65 is not limited to a synthetic resin, and may be a metal such as aluminum.

The cam cylinder 66 is made of a synthetic resin, has an opening in the front-rear direction (± Y direction), is fitted with an insertion portion 65A of the guide cylinder 65, and is centered on the optical axis Ax with respect to the guide cylinder 65. It is formed to be rotatable. A cam groove 661 that engages with cam pins 61p, 62p, and 63p protruding from the rectilinear groove 651 is formed on the inner surface of the cam cylinder 66. The cross-sectional shape of the cam groove 661 is formed so that the tapered tips of the cam pins 61p, 62p, 63p are engaged.
The cam groove 661 introduces cam pins 61p, 62p, and 63p, and is introduced linearly along the optical axis Ax. The cam groove 661 branches from the introduction portion, and the first lens frame 61, the second lens frame 62, the second Each of the three lens frames 63 has a defining portion that regulates the movement of each lens frame 63.

The cam cylinder 66 is provided with a lever (not shown), and rotates when the lever is operated from the outside of the projector 1.
When the cam barrel 66 is rotated, the first lens frame 61, the second lens frame 62, and the third lens frame 63 are guided by the cam pins 61p, 62p, and 63p into the rectilinear groove 651 and the cam groove 661, so that the rectilinear groove They move along 651 independently of each other. Further, the moving amounts of the first lens frame 61, the second lens frame 62, and the third lens frame 63 are different from each other, and the moving amount of the second lens frame 62 is set to be the largest. The first optical system 6 performs focus adjustment by rotating the cam cylinder 66. That is, the first lens unit L1 to the third lens unit L3 contribute to focus adjustment. The focus adjustment here is not limited to adjustment of the focal length, but may be adjustment including adjustment of curvature of field. The cam cylinder 66 is not limited to a synthetic resin, and may be a metal such as aluminum.

  As will be described in detail later, the urging portion 67 includes a first urging portion 67x and a second urging portion 67z supported by the guide tube 65, as shown in FIG. The portion protruding from the cam cylinder 66 is biased in a direction intersecting the optical axis Ax, and has a function of suppressing the inclination of the first lens frame 61 with respect to the optical axis Ax. Specifically, the first urging portion 67x urges the first lens frame 61 in the + X direction, and the second urging portion 67z urges the first lens frame 61 in the −Z direction. The + X direction corresponds to the first direction, and the −Z direction corresponds to the second direction. That is, the urging unit 67 urges the first lens frame 61 in each of the first direction and the second direction that intersect each other in a plane orthogonal to the optical axis Ax.

  As shown in FIG. 4, the second optical system 7 includes a reflection mirror 71 as a reflection unit. The reflection mirror 71 is formed in a concave shape, reflects the light emitted from the first optical system 6 at a wide angle, and passes the vicinity of the first optical system 6. The second optical system 7 may be configured to include a plurality of mirrors and flat mirrors.

As shown in FIG. 4, the projection optical housing 51 includes a housing body 51 </ b> A and a cover 51 </ b> B, and houses the first optical system 6 and the second optical system 7.
As shown in FIGS. 3 and 4, the housing main body 51 </ b> A is formed in a box shape that opens on the −Z side, and the fourth lens frame 64 of the first optical system 6 is inserted through the + Y side wall portion 511. A hole 512 is formed, and an opening 513 that is blocked by the reflection mirror 71 is formed in the -Y side wall.
The wall portion 511 is formed in a rectangular shape in plan view, and the optical device 35 is attached to the surface on the + Y side via a holding member (not shown).
The first optical system 6 is arranged in the housing main body 51A with the guide tube 65 screwed to the housing main body 51A. The reflection mirror 71 is screwed to the housing body 51A via a member such as a leaf spring.

As shown in FIG. 4, the cover 51 </ b> B is formed so as to close the −Y side of the opening portion on the −Z side in the housing main body 51 </ b> A and expose the −Z side of the cam cylinder 66.
The cover 51B has an inclined portion 521 that approaches the optical axis Ax from the vicinity of the −Y side end of the cam cylinder 66 toward the second optical system 7, and a wall portion 522 that extends from the end of the inclined portion 521 to the + Z side. , And an opening 523 through which light reflected by the reflecting mirror 71 passes is formed.

The translucent plate 53 is formed in a rectangular shape with a plate material such as glass, and is attached to the cover 51 </ b> B to close the opening 523.
The light emitted from the cross dichroic prism 352 is refracted by the first optical system 6 and travels in a direction inclined toward the + Z side with respect to the optical axis Ax. The light emitted from the first optical system 6 is reflected by the second optical system 7, travels in a direction inclined to the −Z side with respect to the optical axis Ax, passes through the light transmitting plate 53, and is projected onto the screen SC. Is done.

Here, the first lens frame 61, the second lens frame 62, the third lens frame 63, the guide tube 65, and the urging portion 67 will be described in more detail.
FIG. 6 is a perspective view showing the first lens frame 61, the second lens frame 62, and the third lens frame 63. FIG. 7 is a sectional view of the first optical system 6.
As shown in FIG. 6, the first lens frame 61 has a cam pin 61 p formed in the vicinity of the + Y side end of the holding portion 611. As shown in FIGS. 3 and 7, the −Y side of the holding portion 611 is the cam cylinder 66. It is formed to jump out from. A portion protruding from the cam cylinder 66 of the holding portion 611 is referred to as a frame protruding portion 611A. In the projection optical apparatus 5 of the present embodiment, the amount of protrusion of the holding portion 611 from the cam cylinder 66, that is, the length of the frame protruding portion 611A in the direction along the optical axis Ax is the length of the cam cylinder 66 in the optical axis Ax direction. The state which becomes comparable is comprised. Note that the projection optical device 5 may be configured such that the length of the frame protruding portion 611A in the direction along the optical axis Ax is clearly shorter than the length of the cam tube 66 in the optical axis Ax direction.

As shown in FIG. 4, the frame protruding portion 611 </ b> A seems to be partially cut away at the −Z side, that is, the side on which the light reflected by the reflecting mirror 71 passes. The notch part 611B formed in is provided. The notch 611B is located inside the inclined portion 521 of the cover 51B, and is inclined so as to be closer to the optical axis Ax from the vicinity of the cam cylinder 66 toward the second optical system 7. Further, the inclined portion 521 and the cutout portion 611B are set so as to be substantially parallel to the light beam Ri on the first optical system 6 side of the light reflected by the reflection mirror 71. Note that the shape of the notch 611B is not limited to a flat surface, but may be a step shape as long as the notch 611B is inclined as a whole.
As shown in FIG. 4, the inclined portion 521 of the cover 51B approaches the cutout portion 611B in a range where the first lens frame 61 is not in contact with the cutout portion 611B in a state where the first lens frame 61 is moved to the most -Y side. It is formed as follows.

Further, as shown in FIG. 7, the frame protruding portion 611A is formed with a lens attachment portion 611C that holds the first lens group L1 on the −Y side of the notch portion 611B.
FIG. 8 is a view of the first optical system 6 as viewed from the −Y side, and is a cross-sectional view of the lens attachment portion 611C.
As shown in FIGS. 7 and 8, the lens mounting portion 611C is formed so that the + Z side protrudes, and covers the outer peripheral edge of the first lens unit L1 and the edge of the first lens unit L1 on the + Y side. It is formed as follows. As shown in FIG. 7, the first lens unit L1 is sandwiched between an annular metal plate PL having an opening at the center and a lens mounting portion 611C and held by the lens mounting portion 611C.
Further, as shown in FIG. 7, on the + Z side of the frame protruding portion 611A, a protrusion 611t is provided at a corner portion formed by the lens mounting portion 611C protruding to the + Z side.

  As shown in FIG. 8, the lens mounting portion 611C is formed such that the left and right wall portions 611L and 611R for holding the first lens unit L1 are along the vertical direction (± Z direction). ing. Further, on the + X side wall portion 611R, plate-like protrusions 612a and 612b are formed which protrude in the + X direction and are arranged in parallel in the vertical direction. The protrusion 612a is formed on the −Z side of the protrusion 612b. The -X side wall 611L is formed with a protrusion 613a that protrudes in the -X direction and is formed at substantially the same position as the protrusion 612a in the vertical direction.

  Further, as shown in FIG. 6, the holding portion 611 is formed with an insertion portion 611 h in which the + Y side end of the holding portion 611 is cut out in a rectangular shape in plan view. The insertion portion 611h is formed so that a slide projection 621T (described later) provided on the second lens frame 62 is inserted, and the slide projection 621T is brought into contact with the guide tube 65. Three insertion portions 611h are provided at approximately equal intervals of 120 ° so as to be positioned between adjacent cam pins 61p in the circumferential direction centered on the optical axis Ax.

  As shown in FIG. 7, in the second lens frame 62, the cam pin 62 p is formed in the vicinity of the + Y side end of the holding portion 621, and the −Y side of the holding portion 621 can be inserted into the holding portion 611 of the first lens frame 61. Is formed. That is, the second lens frame 62 is formed so that the −Y side of the holding portion 621 protrudes from the cam cylinder 66 in the same manner as the first lens frame 61. In the holding portion 621, a portion that can be inserted into the holding portion 611 is referred to as an insertion portion 621a, and a portion that is inserted into the fitting insertion portion 65A is referred to as a frame insertion portion 621f.

As shown in FIG. 7, the insertion portion 621a is provided with a frame cutout portion 621c that is positioned inside the cutout portion 611B of the first lens frame 61 and formed so as to be partially cutout. Yes. The frame cutout portion 621c has a shape such that the cross-sectional shape of the insertion portion 621a is L-shaped. The second lens group L2 is held inside the frame notch 621c, and at least a part of the second lens group L2 is movable inside the notch 611B in the first lens frame 61. Placed in.
In addition, as shown in FIG. 6, the cam pin 63p of the third lens frame 63 can enter the holding portion 621 by the movement of the second lens frame 62 and the third lens frame 63, and is cut out in a U-shape. An escape portion 621b is formed.

  As shown in FIGS. 6 and 7, sliding protrusions 621 </ b> T and 621 </ b> U that protrude toward the inner surface of the guide tube 65 are formed on the outer surface of the frame insertion portion 621 f. The sliding protrusions 621T and 621U are formed so that the second lens frame 62 is in contact with the guide tube 65 so as to be slidable with respect to the guide tube 65. The sliding protrusions 621T and 621U of the present embodiment are intermittently formed at substantially equal intervals of 120 ° in the circumferential direction around the optical axis Ax, and are circumferential in the direction along the optical axis Ax. Is formed in a long and long shape.

As shown in FIG. 6, the sliding protrusion 621T is provided at the center of the holding part 621 in the optical axis Ax direction on the + Y side of the frame notch part 621c, and the sliding protrusion 621U is on the + Y side of the holding part 621. It is provided at the end and is formed at substantially the same position as the position of the sliding protrusion 621T in the circumferential direction centered on the optical axis Ax. As shown in FIG. 7, in the direction along the optical axis Ax, the sliding projection 621T is located in the −Y direction of the cam pin 62p, that is, closer to the insertion portion 621a than the cam pin 62p, and the sliding projection 621U is The cam pin 62p is formed so as to be positioned in the + Y direction. That is, the sliding protrusions 621T and 621U are formed on both sides of the cam pin 62p in the direction along the optical axis Ax.
The sliding protrusion 621T is formed so as to be exposed from the insertion portion 611h of the first lens frame 61 as shown in FIG. 7 depending on the positions of the first lens frame 61 and the second lens frame 62.

As shown in FIG. 7, in the third lens frame 63, the cam pin 63 p is formed near the + Y side end of the holding portion 631, and the −Y side of the holding portion 631 can be inserted into the holding portion 621 of the second lens frame 62. Is formed. In the holding portion 631, a portion that can be inserted into the holding portion 621 is referred to as an insertion portion 631a, and a portion that is inserted into the fitting insertion portion 65A is referred to as a frame fitting insertion portion 631f. The third lens group L3 is held in the insertion portion 631a.
As shown in FIGS. 6 and 7, a sliding protrusion 631 </ b> T that protrudes toward the inner surface of the guide cylinder 65 is formed on the outer surface of the frame fitting portion 631 f as shown in FIGS. 6 and 7. The sliding protrusion 631T is formed so that the third lens frame 63 contacts the guide tube 65 so that the third lens frame 63 can slide relative to the guide tube 65. The sliding protrusions 631T of the present embodiment are intermittently formed at substantially equal intervals of 120 ° in the circumferential direction centered on the optical axis Ax, and are long in the circumferential direction longer than the direction along the optical axis Ax. It is formed in a shape.

  As described above, the second lens frame 62 and the third lens frame 63 of the plurality of lens frames (the first lens frame 61, the second lens frame 62, and the third lens frame 63) are on one side of the optical axis Ax ( It has insertion portions 621a and 631a that are inserted into adjacent lens frames on the light emission side and the −Y side, and frame fitting insertion portions 621f and 631f that are fitted into the guide tube 65, and corresponds to a protruding lens frame.

  The cam pin 61p is formed at a position away from the center of gravity including the first lens frame 61 and the member attached to the first lens frame 61 in the direction along the optical axis Ax. Similarly, in the direction along the optical axis Ax, the cam pin 62p is formed at a position away from the center of gravity including the second lens frame 62 and the member attached to the second lens frame 62, and the cam pin 63p is the third lens frame 63. And formed at a position away from the center of gravity including the member attached to the third lens frame 63.

Specifically, as shown in FIG. 7, the position of the center of gravity 61Lg including the first lens frame 61 and the members (the first lens group L1 and the metal plate PL) attached to the first lens frame 61 is the first lens group. The cam pin 61p is formed in a position away from the position of the center of gravity 61Lg in the + Y direction in the direction along the optical axis Ax.
The position of the center of gravity 62Lg including the second lens frame 62 and the member (second lens group L2) attached to the second lens frame 62 is in the second lens group L2, and the cam pin 62p is + Y direction from the position of the center of gravity 62Lg. It is formed at a position distant from each other. Further, the above-described sliding protrusion 621T is formed at a position closer to the center of gravity 62Lg than the cam pin 62p in the direction along the optical axis Ax.

The position of the center of gravity 63Lg including the third lens frame 63 and the member (third lens group L3) attached to the third lens frame 63 is within the third lens group L3, and the cam pin 63p is positioned from the position of the center of gravity 63Lg. It is formed at a position separated in the + Y direction. Further, the aforementioned sliding protrusion 631T is formed on the opposite side of the center of gravity 63Lg across the cam pin 63p in the direction along the optical axis Ax.
Thus, each of the cam pins 61p, 62p, 63p is formed at a position away from the center of gravity 61Lg, 62Lg, 63Lg in the same direction (+ Y direction) in the direction along the optical axis Ax.

  As described above, the guide tube 65 has the fitting insertion portion 65A and the tube protruding portion 65B. As shown in FIG. 3, the tube protruding portion 65B can dispose the frame protruding portion 611A inside, and is cut off. It has a shape that is deleted so as to expose the notch 611B. Then, the end face 65Ba formed as deleted is inclined so as to follow the notch 611B.

9A and 9B are perspective views of the guide tube 65 and the urging portion 67. FIG. 9A is a view seen from the light emission side (−Y side), and FIG. 9B is a view seen from the light incident side (+ Y side). It is a figure.
As shown in FIGS. 7 and 9A, a sliding protrusion 652S that protrudes toward the holding portion 621 of the second lens frame 62 is formed on the inner surface 652 of the fitting insertion portion 65A.
As shown in FIG. 7, the sliding protrusion 652 </ b> S is formed so that the second lens frame 62 contacts the sliding protrusions 621 </ b> T and 621 </ b> U so that the second lens frame 62 can slide with respect to the guide tube 65.
The sliding protrusions 652S are intermittently formed at substantially equal intervals of 120 ° in the circumferential direction around the optical axis Ax, and 2 along the optical axis Ax corresponding to the sliding protrusions 621T and 621U, respectively. A line is formed. In addition, the sliding protrusion 652S is formed in a long shape whose direction along the optical axis Ax is longer than the circumferential direction. That is, the sliding protrusion 652S contacts the sliding protrusions 621T and 621U formed in a long shape whose circumferential direction is longer than the direction along the optical axis Ax with a small contact area.

  As shown in FIG. 9B, the inner surface 653 of the attachment portion 65C is formed so that the inner diameter is smaller than the inner diameter of the inner surface 652 of the fitting insertion portion 65A. The aforementioned sliding protrusion 631T of the third lens frame 63 is formed so that the third lens frame 63 comes into contact with the inner surface 653 so as to be slidable with respect to the guide tube 65, as shown in FIG.

  As described above, the guide tube 65 is formed with the sliding protrusion 652S so that the second lens frame 62 is slidably contacted with the guide tube 65, and the frame fitting insertion portion 621f has the sliding protrusion. 621T and 621U are formed. In addition, a sliding protrusion 631T is formed in the frame fitting insertion portion 631f so that the third lens frame 63 is slidably in contact with the guide tube 65. The second lens frame 62 and the third lens frame 63 that respectively hold the second lens group L2 and the third lens group L3 as the rear lens group are configured as protruding lens frames.

The guide tube 65 has a function of receiving the first lens frame 61 urged by the urging portion 67. As shown in FIG. 8, the guide tube 65 includes a wall portion 65Rx facing the wall portion 611R of the first lens frame 61, a wall portion 65Lx facing the wall portion 611L of the first lens frame 61, and wall portions 65Rx and 65Lx. Each of the walls has wall portions 65Rz and 65Lz that are bent inward from the −Z side edge.
The wall portion 65Rx is formed so as to be able to come into contact with the end surfaces of the protrusions 612a and 612b protruding from the wall portion 611R, and is urged by the first urging portion 67x in the + X direction (first direction). Receive. The wall portions 65Rz and 65Lz are formed so as to be in contact with the protrusions 612a and 613a, and receive the first lens frame 61 urged by the second urging portion 67z in the −Z direction (second direction). The wall portions 65Rx, 65Rz, and 65Lz correspond to receiving portions.

As described above, the urging unit 67 includes the first urging unit 67x and the second urging unit 67z.
The first urging portion 67x and the second urging portion 67z are constituted by plate springs formed from a metal plate material with spring properties, and are supported by the guide cylinder 65 as shown in FIG. 9B. And a pressing portion 672 for pressing the first lens frame 61.

As shown in FIGS. 7 and 9B, the second urging portion 67z has a fixing portion 671 screwed to the outer surface on the + Z side of the cylindrical protruding portion 65B, and a pressing portion 672 provided on the cylindrical protruding portion 65B. The tip portion of the pressing portion 672 is disposed so as to enter the cylinder protruding portion 65B.
Then, as shown in FIG. 7, the second urging portion 67z urges the frame protruding portion 611A in the −Z direction at a position closer to the center of gravity 61Lg than the cam pin 61p in the direction along the optical axis Ax. Specifically, the second urging unit 67z urges the vicinity of the first lens unit L1, that is, the vicinity of the center of gravity 61Lg, in the direction along the optical axis Ax. More specifically, the second urging portion 67z urges the first lens frame 61 with the distal end portion of the pressing portion 672 abutting against a protrusion 611t formed on the + Y side of the lens attaching portion 611C.

  As shown in FIG. 9B, in the first urging portion 67x, the fixing portion 671 is screwed to the outer surface on the −X side of the tube protruding portion 65B, and the tip portion of the pressing portion 672 is provided on the tube protruding portion 65B. It arrange | positions so that it may penetrate | invade in the cylinder protrusion part 65B from the formed hole. The first urging portion 67x is similar to the second urging portion 67z in the direction along the optical axis Ax, with the frame protrusion 611A at a position closer to the center of gravity 61Lg than the cam pin 61p and in the vicinity of the center of gravity 61Lg. Is biased in the + X direction.

The first lens frame 61 urged by the urging portion 67 contacts the receiving portion so as to be slidable with respect to the guide tube 65.
Specifically, as shown in FIG. 8, the first lens frame 61 is urged by the urging force Fx by the first urging portion 67x, and the protrusions 612a and 612b abut against the wall portion 65Rx. Further, the first lens frame 61 is urged by the urging force Fz by the second urging portion 67z, the projection 612a abuts against the wall portion 65Rz, and the projection 613a abuts against the wall portion 65Lz.

  In this manner, the urging unit 67 urges the first lens frame 61 that is located closest to the light emission side (−Y side) among the movable first lens frame 61 to the third lens frame 63. Further, the urging portion 67 includes cam pins 61p, 62p, and 63p with respect to the centers of gravity 61Lg, 62Lg, and 63Lg in the direction along the optical axis Ax among the movable first lens frame 61 to the third lens frame 63, respectively. The first lens frame 61 positioned at the extreme end on the opposite side (-Y direction) to the direction (+ Y direction) formed in the same direction is urged.

When the cam barrel 66 is rotated, the + X side surface of the protrusions 612a and 612b slides on the −X side surface of the wall portion 65Rx, and the first lens frame 61 has −Z of the protrusions 612a and 613a. The side surface slides on the surface on the + Z side of the wall portions 65Rz and 65Lz. Thus, the wall portions 65Rx, 65Rz, and 65Lz as receiving portions receive the first lens frame 61 in a slidable manner. Further, the first lens frame 61 slides with respect to the pressing portion 672 of the urging portion 67.
The second lens frame 62 slides with the sliding projections 621T and 621U coming into contact with the sliding projection 652S of the guide tube 65, and the third lens frame 63 has the slide projection 631T with the inner surface 653 of the guide tube 65. And slides against.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Since the second lens frame 62 as the protruding lens frame slides with the sliding protrusions 621T and 621U coming into contact with the guide tube 65, even if the cam pin 62p is provided at a position away from the center of gravity 62Lg, The inclination with respect to the axis Ax is suppressed. Similarly, the third lens frame 63 as the protruding lens frame slides in contact with the guide tube 65 by the sliding protrusion 631T, so that the optical axis can be provided even if the cam pin 63p is provided at a position away from the center of gravity 63Lg. The inclination with respect to Ax is suppressed. Therefore, the inclination of the second lens group L2 and the third lens group L3 respectively held by the second lens frame 62 and the third lens frame 63 can be suppressed with a space saving and a simple configuration. Therefore, the structure and structural members are prevented from being complicated and downsized (for example, down in the direction along the optical axis Ax of the cam cylinder 66) and light in weight (for example, down in weight due to downsizing of the cam cylinder 66). Thus, it is possible to provide the projection optical device 5 that projects an image with good image quality while suppressing image distortion. In addition, since the inclination of the second lens frame 62 and the third lens frame 63 is suppressed, the second lens frame 62 and the third lens frame 63 can be smoothly moved, and the cam cylinder 66 is rotated manually. In the configuration, the operating force can be reduced, and in the configuration in which the cam cylinder 66 is rotated electrically, the power can be reduced.

  (2) The second lens frame 62 is provided with a sliding projection 621T, and the sliding projection 621T is exposed from an insertion portion 611h formed on the first lens frame 61. Since the sliding protrusion 621T is formed at a position closer to the center of gravity 62Lg than the cam pin 62p in the direction along the optical axis Ax, the tilt of the second lens frame 62 with respect to the optical axis Ax is efficiently suppressed. Is possible.

(3) The second lens frame 62 abuts the guide cylinder 65 (sliding protrusion 652S) by the sliding protrusions 621T and 621U so that both sides of the cam pin 62p can slide in the direction along the optical axis Ax. In addition, the second lens frame 62 comes into contact with the guide tube 65 so that two places can slide in the direction along the optical axis Ax. As a result, the inclination of the second lens frame 62 with respect to the optical axis Ax can be further suppressed.
Further, the sliding protrusion 652S and the sliding protrusions 621T and 621U are formed so as to come into contact with each other with a small contact area, so that two places come into contact with the guide cylinder 65 so as to be slidable in the direction along the optical axis Ax. Even in the configuration, the second lens frame 62 can be moved with a light load.

  (4) The sliding protrusions 621T, 621U, and 631T are intermittently formed in the circumferential direction around the optical axis Ax. This simplifies the mold structure for forming the sliding protrusions 621T, 621U, and 631T as compared with the configuration in which the sliding protrusion is formed over the entire circumference around the optical axis Ax, and the sliding protrusion 621T. , 621U, 631T can be easily processed with a mold for fine adjustment.

  (5) Since the projection optical apparatus 5 includes the second optical system 7 having the reflection mirror 71, the reflection mirror 71 can change the direction of light of the first optical system 6 and widen the angle. Therefore, it is possible to provide the projection optical device 5 that is arranged close to the projection surface and can widen the angle.

  (6) Since the tilt with respect to the optical axis Ax of the second lens unit L2 and the third lens unit L3 contributing to focus adjustment is suppressed, image distortion is suppressed and image quality is good even when focus adjustment is performed. It is possible to provide the projection optical device 5 that projects an image.

  (7) The first lens frame 61 is urged by the urging portion 67 and slides in contact with the wall portions 65Rx, 65Rz, and 65Lz as receiving portions. As a result, the tilt of the first lens unit L1 with respect to the optical axis Ax is suppressed, so that it is possible to provide the projection optical device 5 that projects an image with better image quality.

  (8) Since the projector 1 includes the projection optical device 5, the projector 1 can be miniaturized, and can suppress the distortion of the light modulated by the light modulation device 351 and project an image with good image quality.

(Modification)
In addition, you may change the said embodiment as follows.
Although the projection optical apparatus 5 of the embodiment includes the second optical system 7, the projection optical apparatus 5 may be configured not to include the second optical system 7.

In the above-described embodiment, the rear lens group is composed of two (second lens group L2, third lens group L3), but is not limited to two, and is composed of one, or three or more. There may be.
In the embodiment, all the lens frames (second lens frame 62 and third lens frame 63) holding the rear lens group are configured as protruding lens frames. However, at least one lens group of the rear lens group is used. The lens frame to hold | maintain should just be comprised as a protruding lens frame.

In the above-described embodiment, the second lens frame 62 is configured to be provided on both the second lens frame 62 and the guide tube 65 so that the second lens frame 62 is slidably contacted with the guide tube 65. As long as the sliding projection is formed on at least one of the frame 62 and the guide tube 65, the sliding projection may be formed only on the second lens frame 62 or only on the guide tube 65.
Similarly, in the above embodiment, the configuration in which the third lens frame 63 is provided with the sliding projection that the third lens frame 63 slidably contacts the guide tube 65 is exemplified. As long as the sliding projection is formed on at least one of the guide tube 65, the sliding projection may be formed only on the guide tube 65 or on both the third lens frame 63 and the guide tube 65. .

  In the embodiment, the configuration in which one side of the optical axis Ax is the light emission side is exemplified, but the configuration in which one side of the optical axis Ax is the light incident side may be employed. That is, among the plurality of movable lens groups, the lens group arranged closest to the light incident side is a leading lens group, and the lens group arranged on the other side (light emitting side) of the leading lens group is a rear lens group. The lens frame that is configured and holds at least one lens group of the rear-stage lenses may be configured as a protruding lens frame.

  The sliding protrusions 621T, 621U, and 631T in the above embodiment are intermittently formed in the circumferential direction around the optical axis Ax, but may be formed over the entire circumference.

  The projection optical apparatus may be configured to include a lens group that contributes to zoom adjustment, and the lens frame that holds the lens group may be configured to have a sliding protrusion that slidably contacts the guide tube. .

  The cam cylinder 66 may be configured to rotate electrically using a motor or the like.

  The projector 1 of the embodiment uses a transmissive liquid crystal panel as a light modulation device, but may use a reflective liquid crystal panel. Further, a micromirror type light modulation device such as a DMD (Digital Micromirror Device) may be used as the light modulation device.

  The light modulation device of the embodiment employs a so-called three-plate method using three light modulation devices corresponding to R light, G light, and B light, but is not limited to this, and adopts a single plate method. Alternatively, the present invention can be applied to a projector including two or four or more light modulation devices.

  The light source device 31 is not limited to one using a discharge type lamp, and may be constituted by a solid light source such as a lamp of another type, a light emitting diode, or a laser.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 3 ... Optical unit, 5 ... Projection optical apparatus, 6 ... 1st optical system, 7 ... 2nd optical system, 31 ... Light source device, 51 ... Projection optical housing, 51A ... Housing main body, 51B ... Cover, 53 ... translucent plate, 61 ... first lens frame, 61p, 62p, 63p ... cam pin, 62 ... second lens frame, 63 ... third lens frame, 64 ... fourth lens frame, 65 ... guide tube, 65A ... Insertion part, 65B ... Cylinder protrusion part, 66 ... Cam cylinder, 71 ... Reflection mirror, 311 ... Light source, 351, 351B, 351G, 351R ... Light modulator, 611h ... Insertion part, 621T, 621U, 631T, 652S Sliding projection, 621a, 631a ... insertion portion, 621f, 631f ... frame fitting insertion portion, 651 ... straight advance groove, 653 ... inner surface, 661 ... cam groove, L1 ... first lens group, L2 ... second lens group, L3 ... Third lens group, L ... the fourth lens group.

Claims (7)

A projection optical apparatus having a plurality of movable lens groups sequentially arranged from one side of the optical axis toward the other side,
A plurality of lens frames each holding the plurality of lens groups and having cam pins protruding in a direction perpendicular to the optical axis;
A guide cylinder having a rectilinear groove along the optical axis, the cam pin being inserted into the rectilinear groove;
The guide cylinder is inserted and has a cam groove engaged with the cam pin protruding from the rectilinear groove, and the cam pin is guided by the rectilinear groove and the cam groove by being rotated with respect to the guide cylinder. A cam barrel that moves the plurality of lens frames along the optical axis;
With
At least one lens frame of the plurality of lens frames is a protruding lens frame having an insertion portion inserted into a lens frame adjacent to the one side and a frame insertion portion inserted into the guide tube,
At least one of the inner surface of the guide tube and the outer surface of the frame fitting insertion portion is formed with a sliding protrusion on which the protruding lens frame is slidably contacted with the guide tube ,
Comprising the protruding lens frame having the sliding protrusion,
Projection optics , wherein the lens frame into which the insertion portion of the protruding lens frame having the sliding protrusion is inserted is formed with an insertion portion for bringing the sliding protrusion into contact with the guide tube. apparatus. The projection optical apparatus according to claim 1,
The plurality of lens groups includes a leading lens group disposed on the most one side of the plurality of lens groups, and a plurality of subsequent lens groups sequentially disposed on the other side of the leading lens group,
The projection optical apparatus according to claim 1, wherein the plurality of lens frames that respectively hold the plurality of subsequent lens groups are the protruding lens frames. The projection optical apparatus according to claim 1 or 2 ,
A projection optical apparatus comprising: the protruding lens frame having the sliding protrusions disposed on both sides of the cam pin in a direction along the optical axis. A projection optical apparatus according to any one of claims 1 to 3 ,
The projection optical apparatus, wherein the sliding protrusion is intermittently formed in a circumferential direction around the optical axis. A projection optical apparatus according to any one of claims 1 to 4 ,
A projection optical apparatus, further comprising: a reflecting portion that reflects light on one side of the plurality of lens groups. A projection optical apparatus according to any one of claims 1 to 5 ,
The projection optical apparatus, wherein the plurality of lens groups are lens groups contributing to focus adjustment. A light source;
A light modulation device that modulates light emitted from the light source according to image information;
The projection optical apparatus according to any one of claims 1 to 6 , wherein the light modulated by the light modulation apparatus is projected.
A projector comprising:

Images