JP6520146B2 - projector - Google Patents

Description

  The present invention relates to a projector.

  2. Description of the Related Art There is conventionally known a projector provided with 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. Then, a projector is proposed in which the projection optical device can be replaced (see, for example, Patent Document 1).

The projector described in Patent Document 1 includes an outer case and an optical device. The optical device includes an electro-optical device, a projection optical device (projection optical device), a head body, and a housing for an optical component. Prepare.
The electro-optical device includes a liquid crystal panel as a light modulation device, an incident side polarizing plate and an emission side polarizing plate, and a cross dichroic prism as a color combining optical device.
The projection optical device includes a lens barrel and a flange, and the positioning hole and the fixing hole are formed in the flange.
The head body is formed with projections and screw holes corresponding to positioning holes and fixing holes of the flange, and positioning holes and fixing holes for the optical component casing.
The optical component casing arranges the optical component at a predetermined position, and has a convex portion and a screw hole corresponding to a positioning hole and a fixing hole of the head body.
In the projection optical device, the convex portion of the head body is fitted in the positioning hole of the flange, and is fixed to the head body by a screw inserted from the fixing hole. The head body is fixed to the optical component casing by screws inserted through the fixing holes, with the projections of the optical component casing fitted in the positioning holes.

JP 2005-331561 A

  However, in the technology described in Patent Document 1, in a projector including a heavy projection optical device, there is a problem that the task of attaching the projection optical device to the head body attached to the optical component casing is difficult. That is, it is considered difficult for the operator to hold the projection optical device and fit the positioning hole to the convex portion of the head body. Furthermore, in order to avoid damage to the projection optical apparatus, it is desirable to work carefully, and there is also a problem that a large load is placed on the worker. In addition, not only the installation operation of the projection optical apparatus but also a large load is imposed on the operator in the removal operation.

  The present invention has been made to solve at least a part of the above-described problems, and can be realized as the following modes or application examples.

  The 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 the light modulated by the light modulation device, and the projection And a holding unit for holding an optical device, wherein the holding unit is a base unit having a surface orthogonal to the optical axis of the projection optical device, and an engagement for positioning the projection optical device Unit, and a guide unit on which the projection optical device is mounted and which guides the projection optical device to a predetermined position of the holding unit, the projection optical device including a lens barrel unit for accommodating a plurality of lenses; The flange portion which protrudes from the outer peripheral surface of the lens barrel portion and which faces the base portion, the engaged portion which engages with the engaging portion at the predetermined position, and the projection optical device is mounted on the guide portion Abuts against the guide when placed When, wherein the guide portion, the projection optical device so as to slide, characterized by guiding the projection optical device.

According to this configuration, the projection optical device is placed on the guiding portion with the abutting portion abutting on the guiding portion of the holding portion. Then, when the projection optical apparatus is slidingly moved so that the flange portion approaches the base portion, the engaged portion engages with the engaging portion at a predetermined position, and is positioned in the holding portion. By this, when the operator places the projection optical device in the guide portion, the operator can easily position the projection optical device in the holding portion with a simple operation of bringing the projection optical device close to the base portion without holding the projection optical device. It becomes possible to use and attach to the predetermined position of a holding | maintenance part. In addition, since the projection optical device can be guided by the guide portion even when removed from the holding portion, the operator can easily move away from the base portion without holding the projection optical device positioned in the holding portion. The engagement between the engaged portion and the engaging portion can be released.
Therefore, a heavy projection optical apparatus (for example, a projection optical apparatus mounted on a projector for projecting a bright image or a large image, a so-called high luminous flux image projection optical apparatus equipped with a lens for ultra-single focus, etc. Even if the projector is equipped with the projector, it is possible to provide a projector capable of easily attaching the projection optical device in manufacturing and replacing the projection optical device without putting a heavy burden on the worker. .
In addition, as compared with a configuration in which the projection optical device is positioned on the holder by rotating the projection optical device, the holder is formed so as not to have a shape in the region of the rotation locus of the projection optical device. Since it is not necessary to configure the projection optical device so that the area of the rotation locus of the projection optical device in the unit becomes smaller, it is possible to increase the degree of freedom in the shape of the projection optical device and the holder and simplify the configuration. .

  Application Example 2 In the projector according to the application example described above, the engaging portion is formed on the positioning pin protruding toward the flange portion or the base portion, and the positioning hole is formed along the axis parallel to the optical axis. Any one of the engaged parts is either an insertion hole formed in the flange part and into which the positioning pin is inserted or an insertion pin inserted into the positioning hole, and the guide part A guide pin is formed below the engaging portion in the vertical direction and protrudes from the base portion toward the flange portion, and the contact portion is formed at the vertically lower end of the flange portion Preferably, the guide pin is a notch into which the guide pin is inserted.

  According to this configuration, the projection optical device is placed on the guide pin so that the guide pin is disposed in the notch of the flange portion, and is pushed by the guide pin and moved by being pushed toward the base portion side . Then, the projection optical device moves so that the engaged portion (insertion hole or insertion pin) approaches the engaging portion (positioning pin or positioning hole), and the engaged portion engages with the engaging portion at a predetermined position. Together, it is positioned in the holder. As a result, the projection optical device can be mounted on the guide with a simple configuration, and the guide can guide the slide movement of the projection optical device.

  Application Example 3 In the projector according to the application example described above, the guide pins are disposed in a pair on both sides of the optical axis when viewed from above in the vertical direction, and the notches are provided in a pair corresponding to the guide pins Is preferred.

According to this configuration, since the guide pin and the notch are provided in a pair on both sides of the optical axis, the projection optical device is stably mounted on the guide pin and in the direction to be positioned on the holding portion Stable movement is possible. This makes it possible for the operator to more easily position the projection optical device in the holder.
In addition, the operator mounts the projection optical device on the guide pins by arranging the pair of guide pins so that at least a part of each of the pair of guide pins can be seen from both sides of the lens barrel as viewed from above in the vertical direction. Workability is further improved because it is easy to place.

  Application Example 4 In the projector according to the application example, it is preferable that the guide pin is configured to be attachable to and detachable from the base portion.

  According to this configuration, the guide pin is configured to be removable from the base portion by, for example, connection with a screw. As a result, the guide pins can be removed in a state where the projection optical device is attached to the holding portion, so that it is unnecessary to provide the projector with a space where the guide pins are disposed. It can be configured not to add weight. Therefore, it is possible to provide a projector that can easily perform the mounting operation of the projection optical device, the replacement operation of the projection optical device, and the like while suppressing an increase in size and weight.

  Application Example 5 In the projector according to the application example described above, the engaging portion is formed on the positioning pin protruding toward the flange portion or the base portion, and the positioning hole is formed along the axis parallel to the optical axis. Any one of the engaged parts is either an insertion hole formed in the flange part and into which the positioning pin is inserted or an insertion pin inserted into the positioning hole, and the guide part The projection projects from the base toward the flange and has a flat surface on the upper side in the vertical direction, and the contact projects from the flange and contacts the flat surface, and is parallel to the flat surface. It is preferable that it is a rotation member which can be rotated around an axis.

According to this configuration, the operator places the projection optical device on the guide portion so that the rotation member abuts on the flat surface, thereby moving the projection optical device with a small force and positioning the projection optical device in the holding portion. Can. Therefore, the attachment and removal of the projection optical apparatus to the holder can be further facilitated.
In addition, the projection optical device can be easily moved alone by bringing the rotating member into contact with the floor, the work bench or the like.

  Application Example 6 In the projector according to the application example, it is preferable that the flat surface has an inclined surface that is farther from the optical axis as it is separated from the base portion in the direction along the optical axis.

  According to this configuration, by arranging the holding portion so that the guide portion is located on the work bench, the inclined surface of the guide portion and the upper surface of the work bench can be connected via a small step. It becomes. Thereby, by pushing the projection optical device in which the pivoting member is in contact with the upper surface of the workbench, the pivoting member is continuously moved from the upper surface of the workbench to the inclined surface without lifting the projection optical device from the workbench It is possible to easily put the projection optical device on the guide portion by rotating it. Thus, the load on the worker can be further reduced.

  Application Example 7 In the projector according to the application example described above, the guide portion protrudes upward in the vertical direction from the flat surface, and in a first direction along a straight line where the flat surface intersects with a surface orthogonal to the optical axis. A pair of guide walls facing each other, wherein the distance between the guide walls in the first direction becomes smaller as the distance between the guide walls approaches the base portion; It is preferable to form in the magnitude | size which a rotation member fits.

  According to this configuration, the projection optical device is movable in directions other than the direction toward the base portion by the rotation of the rotation member, but the above-described guide wall causes the rotation member to move toward the base portion You will be guided to In other words, if the projection optical device is placed on the guide portion and the flange portion is brought close to the base portion so that the worker abuts the rotation member on the flat surface inside the pair of guide walls, the projection optical device The moving member is guided by the guide wall to a predetermined position of the holding portion. And since a pair of guide walls are formed at the base end side which becomes a base part side in the separation distance which a rotation member fits, a position concerned where a rotation member fits in a pair of guide walls is engaged The coupling portion may be configured to engage with the engagement portion. Therefore, it is possible to position the projection optical device at a predetermined position of the holding portion with light load, while configuring the projection optical device to be easily mounted.

  Application Example 8 In the projector according to the application example, it is preferable that the guide unit is configured to be removable from the base unit.

  According to this configuration, it is possible to provide a projector that can easily perform the mounting operation of the projection optical device, the replacement operation of the projection optical device, and the like while suppressing an increase in size and weight.

FIG. 1 is a schematic view showing a schematic configuration of a projector according to a first embodiment. FIG. 2 is a perspective view schematically showing the projection lens and the holding unit of the first embodiment. FIG. 6 is a view for explaining the attachment procedure of the projection lens to the holder in the first embodiment. The perspective view which shows typically the projection lens and holding part of 2nd Embodiment. FIG. 8 is a view for explaining the attachment procedure of the projection lens to the holder in the second embodiment. FIG. 10 is a perspective view showing a projection lens and a holding unit of a third embodiment. The perspective view which shows the holding | maintenance part which removed the base part in 3rd Embodiment. FIG. 14 is a perspective view showing a holding unit and a part of a projection lens attached to the holding unit in the third embodiment.

First Embodiment
The projector according to the first embodiment will be described below with reference to the drawings.
The projector of the present embodiment modulates the light emitted from the light source according to the image information, and magnifies and projects the modulated light on a projection surface such as a screen.

[Main configuration of projector]
FIG. 1 is a schematic view showing a schematic configuration of a projector 1 according to the present embodiment.
As shown in FIG. 1, 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 a power supply device 4. Although not shown, a cooling device for cooling the optical unit 3, the power supply device 4 and the like is further disposed inside the exterior housing 2. In the following, for convenience of explanation, in the projector 1 mounted on a desk or the like, the projection surface side is + Y side (front side), the left side of the projector 1 viewed from the rear is + X side (left side), and the vertical upper side is + Z Described as the side (upper side).

Although the detailed description is omitted, the external 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 the warm air inside the external housing 2 to the outside, etc. .
The control unit includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like, and functions as a computer. The control unit controls the operation of the projector 1, for example, projects an image. Control etc.

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, in addition to the light source device 31, an integrator illumination optical system 32, a color separation optical system 33, a relay optical system 34, an optical device 35, a projection lens 5 as a projection optical device, and a projection lens A holder 6 for holding the optical system 5 and an optical component casing 37 for arranging these optical components at predetermined positions on the optical path.

  The light source device 31 includes a discharge type light source 311 composed of an extra-high pressure mercury lamp, a metal halide lamp and the like, a reflector 312 and the like. 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 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 causes the partial light to be substantially superimposed on the light modulation device 351 described later together with the superposition lens 324. The polarization conversion element 323 has a function of aligning random light emitted from the second lens array 322 into substantially one type of polarized light usable by the light modulation device 351.

  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 " It has a function of separating into three color lights of 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 the light modulation device 351 for R light. The optical unit 3 has a configuration in which the relay optical system 34 guides R light. However, the present invention is not limited to this. For example, the optical unit 3 may guide B light.

The optical device 35 is a light modulation device 351 provided for each color light (the light modulation device for R light is 351 R, the light modulation device for G light is 351 G, and the light modulation device for B light is 351 B), And a cross dichroic prism 352 as a color combining optical device.
Each light modulation device 351 includes a transmission type 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. Modulate according to the information.

  The cross dichroic prism 352 has a substantially square shape in plan view in which four right-angle prisms are attached to each other, and two dielectric multilayer films are formed at an interface where the right-angle prisms are attached to each other. The cross dichroic prism 352 reflects R light and B light whose dielectric multilayer films are modulated by the light modulation devices 351 R and 351 B, and transmits G light modulated by the light modulation device 351 G to form three colors. Combine modulated light.

  The projection lens 5 includes a plurality of lenses disposed along the optical axis Ax, and enlarges and projects the light combined by the cross dichroic prism 352 on the screen. Also, the projection lens 5 has functions of focus adjustment and zoom adjustment.

The holder 6 is attached to the optical component casing 37 and holds the projection lens 5.
FIG. 2 is a perspective view schematically showing the projection lens 5 and the holding unit 6, and is a diagram in which the projection lens 5 and the holding unit 6 are separated.
As shown in FIG. 2, the holding portion 6 has a base portion 61, positioning pins 62 protruding from the base portion 61, and guide pins 63 as a guide portion.

The base portion 61 has a reference surface orthogonal to the optical axis Ax on the + Y side, and an opening 611 through which a part of the light incident side of the projection lens 5 is inserted is provided. A plurality of screw holes 61S in which screw grooves are formed on the inner surface are provided.
The positioning pins 62 correspond to engaging portions for positioning the projection lens 5 and are provided in a pair above the opening 611 and project from the surface on the + Y side of the base 61 in the + Y direction, that is, toward the flange 52 ing. The pair of positioning pins 62 are formed to have a cylindrical portion 62a and a tapered portion 62b connected to the cylindrical portion 62a, and are arranged on both sides of the optical axis Ax when viewed from above.

When the projection lens 5 is attached to the holding unit 6, the guide pin 63 mounts the projection lens 5 and guides the projection lens 5 to a predetermined position of the holding unit 6. The guide pin 63 guides the projection lens 5 when the projection lens 5 is removed from the holder 6.
As shown in FIG. 2, the guide pins 63 have a cylindrical shape, and protrude from the surface on the + Y side of the base portion 61 in the + Y direction, that is, toward the flange portion 52. ing. In addition, the pair of guide pins 63 is viewed from above, and on the both sides of the optical axis Ax, specifically, a lens barrel 51 described later when viewed from above with the projection lens 5 mounted (see FIG. 2) Are arranged such that at least a portion of each is visible from both sides of the head, and the tip is formed so as to project in the + Y direction from the tip of the positioning pin 62.

[Mounting structure of projection lens]
Here, the attachment structure of the projection lens 5 to the holder 6 will be described.
As shown in FIG. 2, the projection lens 5 includes a barrel 51 housing a plurality of lenses, and a flange 52 that protrudes from the outer peripheral surface of the barrel 51 and faces the base 61 of the holder 6.
Although detailed illustration is omitted, the lens barrel unit 51 includes a lens frame, a guide cylinder, a cam cylinder, a focus cylinder, and the like.
Among the plurality of lenses, there are lenses that contribute to focus adjustment and zoom adjustment, and this lens is configured to be movable along the optical axis Ax.
The lens frame has a frame portion for holding a lens contributing to zoom adjustment, and a cam pin extending from the frame portion in a direction orthogonal to the optical axis Ax.
The guide cylinder has a cylindrical portion, and a rectilinear groove along the optical axis Ax is formed. In the lens frame, the cam pin is inserted into the rectilinear groove, and the frame portion is movably disposed in the guide cylinder. Further, a lens which does not move along the optical axis Ax is also housed in the guide cylinder.

  The cam cylinder has a cam groove that regulates the movement of the lens frame on the inner surface, and is formed in a tubular shape. A part of the guide cylinder is inserted into the cam cylinder, and a cam pin projecting from the rectilinear groove is engaged with the cam groove. The cam barrel rotates with respect to the guide barrel to guide the cam pin with the rectilinear grooves and the cam groove, and moves the lens frame along the optical axis Ax.

  The focus cylinder holds a lens that contributes to focus adjustment, and is rotatably disposed with respect to the guide cylinder. That is, when the cam cylinder is rotated, zoom adjustment is performed, and when the focus cylinder is rotated, focus adjustment is performed. Although not shown, the projection lens 5 of the present embodiment is provided with a mechanism having a motor and the like for independently rotating the cam cylinder and the focus cylinder, and so-called electric adjustment in which zoom adjustment and focus adjustment are performed by an instruction of the control unit. It consists of a formula.

  The flange portion 52 protrudes from the outer peripheral surface of the lens barrel 51, that is, the outer peripheral surface of the cam cylinder and the cylindrical portion of the guide cylinder exposed from the cam cylinder. Specifically, the flange portion 52 is integrally formed with the guide cylinder, is formed in a rectangular shape as viewed from the direction along the optical axis Ax, and has a reference plane orthogonal to the optical axis Ax on the -Y side. ing. The reference surface abuts on the reference surface of the base portion 61 in a state where the projection lens 5 is attached to the holding portion 6.

In the flange portion 52, an insertion hole 521 as an engaged portion, a notch 522 as a contact portion, and a screw insertion hole 523 are formed.
The insertion hole 521 is a hole with which the positioning pin 62 of the holding portion 6 engages, and the projection lens 5 is inserted into the insertion hole 521 of the flange 52 at a predetermined position, and the cylindrical portion 62a of the positioning pin 62 is inserted. 52 abuts on the base portion 61 and is positioned in the holding portion 6.

  The notch 522 is provided at the lower end portion of the flange portion 52 and is formed in a U-shape in plan view. The notches 522 are portions that come into contact with the guide pins 63 when the projection lens 5 is placed on the holding unit 6, and a pair of notches 522 is provided corresponding to the pair of guide pins 63. The guide pin 63 is inserted in the notch 522, and the play in the lateral direction (± X direction) is set with respect to the guide pin 63. The notch 522 is not limited to the U shape, and may have a rectangular shape in plan view.

  The screw insertion holes 523 are formed at positions corresponding to the screw holes 61 S of the holding portion 6. In the projection lens 5, the cylindrical portion 62a of the positioning pin 62 is inserted into the insertion hole 521 and positioned in the holding portion 6, and the screw inserted from the screw insertion hole 523 is screwed into the screw hole 61S and fixed to the holding portion 6. Be done.

Next, the procedure for attaching the projection lens 5 to the holder 6 will be described.
FIG. 3 is a view for explaining the attachment procedure of the projection lens 5 to the holding unit 6, and is a perspective view schematically showing the projection lens 5 and the holding unit 6. As shown in FIG. Although the holding unit 6 is attached to the optical component casing 37, the optical component casing 37 is omitted in FIG.

  First, as shown in FIG. 3A, the projection lens 5 is placed on the guide pin 63 so that the guide pin 63 is disposed in the notch 522 of the flange portion 52. In this state, the projection lens 5 is separated from the positioning pin 62, and the movement in the lateral direction (± X direction) is restricted.

Next, when the projection lens 5 is pushed in the -Y direction, the projection lens 5 is guided by the guide pin 63 and slides toward the holding portion 6, and the insertion hole 521 of the flange portion 52 is a positioning pin 62 of the holding portion 6. Approach to Furthermore, when the projection lens 5 is pressed in the −Y direction, the tapered portion 62 b of the positioning pin 62 of the holding portion 6 is inserted into the insertion hole 521. Then, when the flange portion 52 is pushed until it abuts on the base portion 61, the insertion hole 521 and the cylindrical portion 62 a of the positioning pin 62 are engaged, and the projection lens 5 is positioned in the holding portion 6.
Then, as shown in FIG. 3B, the projection lens 5 is attached to the holding portion 6 by screwing the screw SC inserted from the screw insertion hole 523 into the screw hole 61S.

When removing the projection lens 5 from the holder 6, after removing the screw SC screwed into the screw hole 61S, pressing the projection lens 5 in the + Y direction results in the engagement between the insertion hole 521 and the positioning pin 62 It is released. Then, when the positioning pin 62 is slid to the point where it is pulled out of the insertion hole 521, the projection lens 5 can be removed from the holding portion 6.
As described above, the projection lens 5 is placed on the guide pin 63, and when the flange 52 is brought close to the base 61, the projection lens 5 is guided by the guide pin 63 and positioned in the holder 6. Further, the projection lens 5 is guided by the guide pin 63 and removed from the holding unit 6.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained.
(1) After the projection lens 5 is placed on the guide pin 63, the projection lens 5 is pushed until the flange 52 abuts on the base 61 and positioned in the holder 6. As a result, when the operator places the projection lens 5 on the guide pin 63, the operator can easily position the projection lens 5 on the holding unit 6 and attach it to the holding unit 6 without holding the projection lens 5. Further, since the projection lens is guided by the guide pin 63 even when removed from the holding portion 6, the operator can easily position the positioning pin 62 and the insertion hole without holding the projection lens 5 positioned in the holding portion 6. The projection lens 5 can be removed by releasing the engagement with the lens 521.
Therefore, even if the projector lens 5 has a heavy weight, the projector 1 can be easily attached to and removed from the holder 6 without putting a heavy burden on the operator. It becomes possible.

  (2) The guide pin 63 guides the projection lens 5 so that the projection lens 5 slides. This makes it possible to increase the degree of freedom of the shapes of the projection lens 5 and the holding unit 6 and to simplify the configuration. For example, in a configuration in which the projection optical device is positioned on the holder by rotating the projection optical device, the holder may be formed so as not to have a shape in the region of the rotation locus of the projection optical device, or Although it is necessary to configure the projection optical device so that the area of the rotation trajectory of the projection optical device in the unit becomes small, in the configuration of the present embodiment, these restrictions are suppressed. That is, by providing the holding portion 6 with an area in which the projection lens 5 can slide, for example, the opening portion 611 in the base portion 61, it becomes possible to configure a form of easily guiding the projection lens 5 by the guide pin 63 .

(3) The guide pins 63 are arranged in a pair on both sides of the optical axis Ax when viewed from above, and the notches 522 are provided in correspondence with the guide pins 63. Thus, the projection lens 5 can be stably mounted on the guide pin 63 and can be moved stably in the direction in which the projection lens 5 is positioned on the holding unit 6. As a result, the operator can more easily position the projection lens 5 on the holder 6.
Further, since the pair of guide pins 63 are arranged so that at least a part of each can be seen from both sides of the lens barrel 51 when viewed from above, the operator places the projection lens 5 on the guide pins 63. It is easy to do and the workability is further improved.

Second Embodiment
The projector according to the second embodiment will be described below with reference to the drawings. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted or simplified.
The projector of this embodiment includes a projection lens 15 and a holding unit 16 which are different from the projection lens 5 and the holding unit 6 of the first embodiment.

FIG. 4 is a perspective view schematically showing the projection lens 15 and the holding unit 16 and is a diagram in which the projection lens 15 and the holding unit 16 are separated.
The holding portion 16 protrudes from the base portion 161 and has a positioning pin 62 as an engaging portion, as shown in FIG. 4, like the base portion 161, the guide portion 163, and the holding portion 6 of the first embodiment. ing.
Similar to the base portion 61 of the first embodiment, the base portion 161 is provided with the opening 611 and a plurality of screw holes 61S.

  The guide portion 163 is provided at the lower end portion of the base portion 161 and protrudes from the base portion 161 toward the projection lens 15 side. The guide portion 163 has a flat surface FL provided on the upper side, and a pair of guide walls 1631 projecting upward from the flat surface FL.

  The flat surface FL has a base end surface 163 a provided at the base end of the guide portion 163 and an inclined surface 163 b bent from the base end surface 163 a. The base end face 163a is formed along the optical axis Ax and the left and right direction (± X direction). The inclined surface 163b is inclined so as to be farther from the optical axis Ax as it is separated from the base portion 161 in the direction along the optical axis Ax.

The pair of guide walls 1631 are opposed to each other in the first direction along the straight line where the flat surface FL and the plane orthogonal to the optical axis Ax intersect, that is, in the left-right direction. In addition, the distance between the guide walls 1631 in the first direction (horizontal direction) decreases as it approaches the base portion 161, and the rotation of the projection lens 15 described later at the base end portion on the base portion 161 side It is formed in the magnitude | size which member 1531 fits. That is, the flat surface FL between the pair of guide walls 1631 is formed to be the narrowest at the base portion 161 side in the first direction (left and right direction) and to be wider as it is separated from the base portion 161.
Further, the base portion 161 is formed with a rectangular opening 1612 whose one side follows the base end face 163a.

As shown in FIG. 4, the projection lens 15 includes a flange portion 152 different from the flange portion 52 of the first embodiment, and a caster 153 supported by the flange portion 152. FIG. 4 is a view schematically showing the structure of the caster 153. As shown in FIG.
The flange portion 152 is not provided with the notch 522 of the flange portion 52 in the first embodiment, and the insertion hole 521 and the screw insertion hole 523 are formed in the same manner as the flange portion 52.

  Although the caster 153 is not shown in detail, a support member (not shown) supported at the lower end of the flange portion so as to be rotatable about an axis extending in the vertical direction (± Z direction). On the other hand, a pivoting member 1531 (see FIG. 4) rotatably supported about an axis along the XY plane is provided. The pivoting member 1531 is formed in a cylindrical shape, and corresponds to an abutting portion that abuts on the flat surface FL when the projection lens 15 is attached to and detached from the holding portion 16.

Here, the procedure for attaching the projection lens 15 to the holder 16 will be described.
FIG. 5 is a view for explaining the attachment procedure of the projection lens 15 to the holding portion 16 and is a cross-sectional view schematically showing the projection lens 15 and the holding portion 16. Although the holding unit 16 is attached to the optical component casing 37, the optical component casing 37 is omitted in FIG.

  First, as shown in FIG. 5A, the holding portion 16 is disposed such that the guide portion 163 is positioned on the workbench TA. The guide portion 163 is arranged such that the inclined surface 163b is connected to the upper surface of the work bench TA via a small step (not shown). The work table TA may be provided with a recess so that the difference in level between the inclined surface 163b and the upper surface of the work table TA is minimized.

  Next, the projection lens 15 with the rotating member 1531 in contact with the work table TA is moved, and the projection lens 15 is placed on the inclined surface 163 b from the front of the guide portion 163. Then, when the projection lens 15 is pushed to raise the inclined surface 163 b, the flange portion 152 gradually approaches the base portion 161. The projection lens 15 is movable in directions other than the direction approaching the base portion 161 by the rotation of the rotation member 1531, but the pair of guide walls 1631 directs the rotation member 1531 to the base portion 161 side. The tapered portion 62 b of the positioning pin 62 is inserted into the insertion hole 521 while being guided.

Furthermore, when the projection lens 15 is moved upward, the pivoting member 1531 is fitted in the pair of guide walls 1631 in the left-right direction, and pivots on the proximal end surface 163 a from the inclined surface 163 b. Then, the projection lens 15 is inserted until the cylindrical portion 62a of the positioning pin 62 is inserted into the insertion hole 521 and the flange portion 152 abuts on the base portion 161, as shown in FIG. Is positioned at In addition, a part of the caster that protrudes from the −Y side of the flange portion 152 is disposed in the opening 1612.
Then, the projection lens 15 is attached to the holding portion 16 by screwing the screw SC inserted through the screw insertion hole 523 into the screw hole 61S as in the projection lens 5 of the first embodiment.

When removing the projection lens 15 from the holder 16, after removing the screw SC screwed into the screw hole 61S, pressing the projection lens 15 in the + Y direction results in engagement between the insertion hole 521 and the positioning pin 62. It is released. Then, the projection lens 15 is removed from the holding portion 16 by pivoting the pivoting member 1531 on the base end surface 163 a and the inclined surface 163 b.
As described above, the projection lens 15 is placed on the inclined surface 163 b by continuously rotating the inclined surface 163 b from the upper surface of the work table TA. Then, in the projection lens 15, the pivoting member 1531 is guided by the pair of guide walls 1631, and the flat surface FL is slid and positioned on the holding portion 16. In addition, the projection lens 15 is guided by the guide portion 163 and removed from the holding portion 16.

As described above, according to the projector of the present embodiment, the following effects can be obtained.
(1) The operator places the projection lens 15 with a small force and positions it on the holding portion 16 by placing the projection lens 15 on the guide portion 163 so that the rotation member 1531 abuts on the flat surface FL. be able to. Therefore, the attachment and removal of the projection lens 15 to the holding portion 16 is further facilitated.
In addition, the projection lens 15 can be easily moved alone by bringing the rotating member 1531 into contact with the floor, the work bench TA or the like.

  (2) The projection lens 15 has the inclined surface 163b on the guide portion 163, so the inclined surface 163b is continuously rotated from the upper surface of the work bench TA and placed on the guide portion 163. By this, the projection lens 15 can be easily placed on the guide portion 163 without lifting the projection lens 15 from the work bench TA. Thus, the load on the worker can be further reduced.

  (3) The projection lens 15 is placed from a portion wider than the base portion 161 side of the inclined surface 163b in the first direction (left and right direction), and the rotating member 1531 is guided by the guide wall 1631 and positioned in the holding portion 16 Be done. As a result, it is possible to position the projection lens 15 at a predetermined position of the holding portion 16 with a light load, while configuring the projection lens 15 to be further easily mounted.

Third Embodiment
The projector according to the third embodiment will be described below with reference to the drawings. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted or simplified.
In the first and second embodiments, the projection lenses 5 and 15 positioned in the holders 6 and 16 are configured to be fixed to the holders 6 and 16 with screws. Has a so-called spigot-type configuration that includes a member that rotates when the lever is operated, and this rotating member engages with a part of the projection lens to fix the projection lens.

FIG. 6 is a perspective view showing the projection lens 25 and the holding unit 7 of the present embodiment, in which the projection lens 25 and the holding unit 7 are separated. FIG. 6 is a view schematically showing the projection lens 25. As shown in FIG.
As shown in FIG. 6, the projection lens 25 of the present embodiment includes the barrel 51 and the barrel 251 and the flange 252 different in shape from the flange 52 in the projection lens 5 of the first embodiment.

The barrel unit 251 includes a protrusion 2511 which the barrel unit 51 of the first embodiment does not have. The protrusions 2511 are provided on the barrel portion 251 on the −Y side of the flange portion 252, and project from the outer surface of the barrel portion 251 at equal intervals of 120 ° in the circumferential direction about the optical axis Ax.
The flange portion 252 does not have the screw insertion holes 523 (see FIG. 2) which the flange portion 52 of the first embodiment has, and has a pair of insertion holes 521 and a pair of notches 522 like the flange portion 52. ing. Further, in the flange portion 252, a rectangular notch 2521 is formed between the pair of insertion holes 521.

The holding portion 7 includes a pressing member 72, a receiving member 73, a coil spring 74, and a lever 75 in addition to the base portion 71, the positioning pin 62, and the guide pin 63, as shown in FIG.
The base portion 71 does not have a screw hole 61S (see FIG. 2) provided in the base portion 61 of the first embodiment, and a notch 711 located between the pair of positioning pins 62 at the upper end is formed. . The notch 711 is formed at a position corresponding to the notch 2521 of the flange portion 252.
The positioning pin 62 and the guide pin 63 are attached to the base portion 71 in the same manner as the positioning pin 62 and the guide pin 63 of the first embodiment are attached to the base portion 61.

The pressing member 72 is rotatably disposed on the −Y side of the base portion 71 about the optical axis Ax, engages with the projection 2511 of the projection lens 25 at a predetermined position, and fixes the projection lens 25 to the holding portion 7 Have a function to
FIG. 7 is a perspective view showing the holding portion 7 from which the base portion 71 is removed.
As shown in FIG. 7, the pressing member 72 is formed with an opening 721 circular in plan view through which the −Y side of the lens barrel 251 (see FIG. 6) is inserted, and the peripheral edge of the opening 721 is projected A notch 722 is provided through which the protrusion 2511 (see FIG. 6) of the lens 25 is inserted. Further, a recess 723 formed on the −Y side of the pressing member 72 is formed at the periphery of the opening 721 so as to be connected to the notch 722. Further, in the pressing member 72, a plurality of arc-shaped elongated holes 724 centering on the optical axis Ax are formed.

  The receiving member 73 is disposed on the -Y side of the pressing member 72, and has a function of supporting the pressing member 72. As shown in FIG. 7, the receiving member 73 is formed with an opening 731 having a circular shape in plan view, through which the −Y side of the lens barrel 251 is inserted, and a circle inserted into the long hole 724 outside the opening 731. Column-like pins 732 are attached. A screw groove is formed at the tip of the pin 732.

  As shown in FIG. 7, the coil spring 74 is supported by a pin 732 protruding from the pressing member 72 and is positioned by a nut Na or the like attached to the tip of the pin 732. Then, the coil spring 74 biases the pressing member 72 to the receiving member 73 side.

  The lever 75 is a member operated when the projection lens 25 is attached to and detached from the holding unit 7. As shown in FIG. 7, the lever 75 is formed in a rod shape, one end thereof is pivotally supported by the upper end of the pressing member 72, and the pressing member 72 is rotated by the other end being operated. Specifically, as shown in FIG. 6, the lever 75 is operated in a state of extending along the pressing member 72 (a state shown by a two-dot chain line in FIG. 6). Rotate. Then, when the lever 75 is operated in the first state (not shown) located at the leftmost position as viewed from the front (not shown), the pressing member 72 is disposed at a position where the projection lens 25 can be attached to the holder 7 Ru. On the other hand, when the lever 75 is operated in the second state in which the lever 75 is at the rightmost position as viewed from the front, the pressing member 72 is disposed at a position where the projection lens 25 is fixed to the holder 7. In the second state, the lever 75 can be bent around a portion pivotally supported by the pressing member 72 (a state shown by a solid line in FIG. 6).

Here, the procedure for attaching the projection lens 25 to the holder 7 will be described.
First, the lever 75 is brought into the first state. Next, as described in the first embodiment, the projection lens 25 is placed on the guide pin 63, and the projection lens 25 is pressed. When the light incident side of the lens barrel 251 is inserted into the opening 721, the projection lens 25 passes through the notch 722 and is positioned by the holder 7 as described in the first embodiment. .

  With the projection lens 25 positioned in the holder 7, the lever 75 is turned clockwise as viewed from the front to be in the second state. When the lever 75 is operated from the first state to the second state, the depression member 723 (see FIG. 7) of the pressing member 72 engages with the projection 2511 of the projection lens 25. Since the pressing member 72 is biased toward the receiving member 73 by the coil spring 74, the projection lens 25 is pressed toward the receiving member 73 by the pressing member 72, and the flange 252 is pressed against the base 71. It is fixed to the holder 7.

FIG. 8 is a perspective view showing the holding unit 7 and a part of the projection lens 25 attached to the holding unit 7.
After the projection lens 25 is attached to the holder 7, when the lever 75 is bent, the lever 75 is rotated toward the optical axis Ax and is inserted into the notches 711 and 2521 as shown in FIG. It is in a state of being juxtaposed to the lens barrel 251.

  When the projection lens 25 is removed from the holder 7, the lever 75 inserted through the notches 711 and 2521 is raised, and the lever 75 is turned counterclockwise as viewed from the front to be in the first state. Then, as described in the first embodiment, the projection lens 25 is removed from the holding unit 7. The positioning pin 62 and the guide pin 63 may be configured to be attached to a member other than the base portion 71, for example, the receiving member 73.

As described above, according to the projector of the present embodiment, the following effects can be obtained.
Fixation of the projection lens 25 positioned on the holding unit 7 and release of the fixation can be performed by a simple operation of rotating the lever 75.
Further, since the lever 75 is configured to be bendable, it is possible to set an easy-to-operate length when attaching and detaching the projection lens 25, and in a state where the projection lens 25 is fixed to the holding portion 7. The space for arranging the lever 75 in the projector can be saved.

(Modification)
The above embodiment may be modified as follows.
The guide may be configured to be movable along the optical axis Ax. For example, the projection optical device is mounted on the guide portion in a state in which a part can be accommodated in the base portion and the projection amount from the base portion can be changed, and the projection portion in the state of largely projecting out from the base portion The optical device may be configured to move together with the guide and be positioned in the holder.

The guide pin 63 of the first embodiment may be configured to be removable from the base portion 61. For example, a screw portion may be provided on one end side of the guide pin 63, and a screw hole screwed to the screw portion may be provided in the base portion 61. As a result, the guide pin 63 can be removed in a state where the projection lens 5 is attached to the holding portion 6, so it is unnecessary to provide the projector 1 with a space where the guide pin 63 is disposed. Can be configured so as not to be added to the weight of the projector 1.
Similarly, the guide portion 163 of the second embodiment and the guide pin 63 of the third embodiment may be configured to be removable.

  In the embodiment, the positioning pin 62 is used as the engaging portion, and the insertion hole 521 is used as the engaged portion. However, the positioning hole along the axis parallel to the optical axis Ax is provided in the base portion, and the positioning hole is engaged Alternatively, an insertion pin inserted into the positioning hole may be provided on the flange portion, and the insertion pin may be configured as an engaged portion.

Although the flat surface FL has the inclined surface 163b in the guide portion 163 of the second embodiment, it may be a flat surface not having the inclined surface 163b.
In addition, the guide portion 163 of the second embodiment is provided at the lower end portion of the base portion 161, but not limited to the lower end portion, the optical axis Ax is closer to the center than other positions, for example, the lower end portion in the vertical direction. The projection optical apparatus may be configured to be provided with a pair of guide portions having flat surfaces on both sides with the pair of guide portions interposed therebetween, and a pair of casters corresponding to the pair of guide portions.

  In the second embodiment, although the caster 153 having a columnar rotation member 1531 is used, a spherical rotation member is used, this spherical rotation member is used at the lower end of the flange portion, and a member such as a sheet metal is used. It may be configured to be rollably supported.

  In the second embodiment, although the caster 153 having the columnar rotation member 1531 is used, it may be configured as a fixed protrusion and configured to slide on the flat surface FL. At that time, the fixed protrusion may have a small contact area, for example, a cylindrical shape to reduce friction with the flat surface FL, and the surface may be subjected to a mirror finish.

  In the above embodiment, a method using screws and a spigot method have been exemplified as a fixing method of the projection optical device, but it may be a bayonet method held by the holding unit by rotating the projection optical device. In the case of this configuration, the insertion hole through which the positioning pin is inserted is formed in an arc shape. Then, the guide unit on which the projection lens is mounted is configured to guide the projection lens even if the projection lens is rotated.

  Even if the projector has a lens shift mechanism for moving the projection optical device in the direction orthogonal to the optical axis Ax, and the holding units 6, 16 and 7 in the embodiment constitute a part of the lens shift mechanism. Good. For example, the holding portions 6, 16, 7 may be configured to be movable in the lateral direction or the vertical direction with respect to the members disposed on the -Y side of the holding portions 6, 16, 7.

The projection lens 5 of the first embodiment is configured to be electrically driven for focus adjustment and zoom adjustment, but may be configured manually for rotating the cam cylinder and the focus cylinder manually.
Also, although the projection lens 5 of the first embodiment is configured to optically perform focus adjustment and zoom adjustment, it may be configured by electronic adjustment that performs zoom adjustment by image processing. Further, focus adjustment may be performed by rotation of the cam cylinder.

  Although the projector 1 according to the embodiment uses a transmissive liquid crystal panel as the light modulation device 351, it may use a reflective liquid crystal panel. Further, as the light modulation device, a micromirror light modulation device such as a DMD (Digital Micromirror Device) may be used.

  The light modulation device 351 according to the embodiment adopts a so-called three-plate system using three light modulation devices 351R, 351G, 351B corresponding to R light, G light, and B light, but the invention is not limited thereto. The single plate method may be adopted, or the invention can be applied to a projector provided with two or four or more light modulation devices.

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

  DESCRIPTION OF SYMBOLS 1 ... Projector, 3 ... Optical unit, 5, 15, 25 ... Projection lens (projection optical device), 6, 16, 7 ... Holding part, 31 ... Light source device, 37 ... Housing | casing for optical components, 51, 251 ... Mirror Tubular part, 52, 152, 252 ... flange part, 61, 71, 161 ... base part, 62 ... positioning pin (engaging part), 63 ... guide pin (guiding part), 72 ... pressing member, 73 ... receiving member, 74: coil spring, 75: lever, 153: caster, 163: guide portion, 163a: base end face, 163b: inclined surface, 311: light source, 351, 351B, 351G, 351R: light modulation device, 521: insertion hole Joint parts) 522 Notches (contact parts) 523 Screw insertion holes 1531 Rotational members (contact parts) 1631 Guide walls 2511 Projections AX Optical axis FL Flat surface

Claims (7)

A light source, a light modulation device for modulating light emitted from the light source, and modulation by the light modulation device
Pro that is provided with a projection optical device that projects the projected light and a holding unit that holds the projection optical device
Being a Jector,
The holding unit is
A base portion having a plane orthogonal to the optical axis of the projection optical device;
An engagement portion for positioning the projection optical device;
A guide on which the projection optical device is mounted and which guides the projection optical device to a predetermined position of the holding unit
With the department,
The projection optical device is
A lens barrel that houses a plurality of lenses;
A flange that protrudes from the outer peripheral surface of the lens barrel and faces the base;
An engaged portion engaged with the engaging portion at the predetermined position;
And a contact portion that contacts the guide when the projection optical device is placed on the guide.
The engaging portion is either a positioning pin projecting toward the flange portion or a positioning hole formed on the base portion and along an axis parallel to the optical axis,
The engaged portion is formed in the flange portion, and an insertion hole into which the positioning pin is inserted.
Or any one of insertion pins inserted into the positioning holes,
The guide portion is a guide pin formed below the engaging portion in the vertical direction and protruding from the base portion toward the flange portion, and the projection optical device is moved so that the projection optical device slides. Guide
The projector according to claim 1, wherein the contact portion is a notch which is formed at an end portion of the flange portion on the lower side in the vertical direction and into which the guide pin is inserted. The projector according to claim 1 , wherein
The guide pins are arranged in pairs on both sides of the optical axis when viewed from above in the vertical direction,
The projector is characterized in that the notches are provided in a pair corresponding to the guide pins. The projector according to claim 1 or 2 , wherein
The projector according to claim 1, wherein the guide pin is configured to be attachable to and detachable from the base portion. A light source, a light modulation device for modulating light emitted from the light source, and modulation by the light modulation device
Pro that is provided with a projection optical device that projects the projected light and a holding unit that holds the projection optical device
Being a Jector,
The holding unit is
A base portion having a plane orthogonal to the optical axis of the projection optical device;
An engagement portion for positioning the projection optical device;
A guide on which the projection optical device is mounted and which guides the projection optical device to a predetermined position of the holding unit
With the department,
The projection optical device is
A lens barrel that houses a plurality of lenses;
A flange that protrudes from the outer peripheral surface of the lens barrel and faces the base;
An engaged portion engaged with the engaging portion at the predetermined position;
And a contact portion that contacts the guide when the projection optical device is placed on the guide.
The engaging portion is either a positioning pin projecting toward the flange portion or a positioning hole formed on the base portion and along an axis parallel to the optical axis,
The engaged portion is formed in the flange portion, and an insertion hole into which the positioning pin is inserted.
Or any one of insertion pins inserted into the positioning holes,
The guide unit, the direction from the base portion to the flange portion protrudes been made to have a flat surface on the upper side in the vertical direction, the projection optical device to guide the projection optical device so as to slide,
The projector according to claim 1, wherein the contact portion is a rotating member that protrudes from the flange portion and contacts the flat surface, and is rotatable about an axis parallel to the flat surface. The projector according to claim 4 , wherein
The projector according to claim 1, wherein the flat surface has an inclined surface which is further from the optical axis as it is separated from the base portion in a direction along the optical axis. The projector according to claim 4 or 5 , wherein
The guide portion has a pair of guide walls facing each other in a first direction along a straight line that projects vertically upward from the flat surface and intersects the flat surface and a surface orthogonal to the optical axis.
The distance between the pair of guide walls in the first direction decreases as the distance from the base portion to the base portion decreases, and the proximal end portion on the base portion side is sized to fit the rotating member. A projector characterized by A projector according to any one of claims 4 to 6 , wherein
The projector according to claim 1, wherein the guide unit is configured to be removable from the base unit.

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