JP2016138916A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector in which attachment and replacement work of a projection lens is facilitated.SOLUTION: The projector comprises a light source, a light modulation device, a projection lens 5, and a holding part 6 for holding the projection lens 5. The holding part 6 comprises a base part 61 having a face orthogonal to an optical axis Ax, a positioning pin 62 for positioning the projection lens 5, and a guide pin 63 on which the projection lens 5 is placed and held and which guides the projection lens 5 to a predetermined position of the holding part 6. The projection lens 5 comprises a lens barrel part 51 for storing a plurality of lenses, a flange part 52 projecting from the outer circumferential surface of the lens barrel part 51 and facing the base part 61, an insertion hole 521 engaged with the positioning pin 62 at a predetermined position, and a notch 522 abutting on the guide pin 63 when the projection lens 5 is placed and held on the guide pin 63. The guide pin 63 guides the projection lens 5 so that the projection lens 5 slidably moves.SELECTED DRAWING: Figure 3

Description

  The present invention relates to 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. A projector that can replace the projection optical apparatus has been proposed (see, for example, Patent Document 1).

The projector described in Patent Document 1 includes an exterior 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 optical components. 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 a positioning hole and a fixing hole are formed in the flange.
The head body is formed with convex portions and screw holes corresponding to the positioning holes and fixing holes of the flange, and positioning holes and fixing holes for the optical component housing.
The optical component casing has an optical component at a predetermined position, and has a convex portion and a screw hole corresponding to the positioning hole and the fixing hole of the head body.
In the projection optical apparatus, the convex portion of the head body is fitted into the positioning hole of the flange, and the projection optical apparatus is fixed to the head body with a screw inserted through the fixing hole. The head body is fixed to the optical component casing by a screw inserted through the fixing hole with the convex portion of the optical component casing fitted in the positioning hole.

JP 2005-331561 A

  However, the technique described in Patent Document 1 has a problem that it is difficult to attach the projection optical device to the head body attached to the optical component casing in a projector including a heavy projection optical device. 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 desired to work carefully, and there is a problem that a heavy load is imposed on the operator. Further, not only the operation of attaching the projection optical apparatus but also a heavy load is imposed on the operator in the removal operation.

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

  Application Example 1 A projector according to this application example includes a light source, a light modulation device that modulates light emitted from the light source, a projection optical device that projects light modulated by the light modulation device, and the projection. A holding unit that holds the optical device, wherein the holding unit has a base portion having a surface perpendicular to the optical axis of the projection optical device, and an engagement for positioning the projection optical device And a guide unit on which the projection optical device is mounted and guides the projection optical device to a predetermined position of the holding unit, and the projection optical device includes a lens barrel unit that houses a plurality of lenses, A flange portion that protrudes from the outer peripheral surface of the lens barrel portion and faces the base portion, an engaged portion that engages with the engaging portion at the predetermined position, and the projection optical device are mounted on the guide portion. Abutting against the guide part 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 apparatus is placed on the guide unit with the contact unit contacting the guide unit of the holding unit. When the projection optical device is slid so that the flange portion is brought close to the base portion, the engaged portion and the engaging portion are engaged at a predetermined position, and the projection optical device is positioned on the holding portion. As a result, when the projection optical device is placed on the guide unit, the operator can easily position the projection optical device on the holding unit and move the screw etc. It can be used and attached to a predetermined position of the holding portion. Further, since the projection optical device can be guided by the guide portion even when it is detached from the holding portion, the operator can easily move away from the base portion without holding the projection optical device positioned on the holding portion. The engagement between the engaged portion and the engaging portion can be released.
Therefore, a heavy projection optical device (for example, a projection optical device mounted on a projector that projects a bright image or a large image, that is, a so-called high luminous flux image, a projection optical device mounted with an ultra-single-focus lens, etc. ), It is possible to provide a projector capable of easily mounting a projection optical device in manufacturing, replacing the projection optical device, and the like without imposing a heavy burden on the operator. .
In addition, compared to a configuration in which the projection optical device is positioned on the holding unit by rotating the projection optical device, the holding unit is formed or held 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 region of the rotation trajectory of the projection optical device in the unit becomes small, it becomes possible to increase the degree of freedom of the shapes in the projection optical device and the holding unit and to simplify the configuration. .

  Application Example 2 In the projector according to the application example described above, the engagement portion is formed on a positioning pin that protrudes toward the flange portion or the base portion, and a positioning hole that extends along an axis parallel to the optical axis. The engaged portion is one of an insertion hole formed in the flange portion and into which the positioning pin is inserted, or an insertion pin inserted into the positioning hole, and the guide portion. Is a guide pin that 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 an end portion of the flange portion on the lower side in the vertical direction. It is preferable that 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 moved by being guided by the guide pin by being pushed to the base portion side. . Then, the projection optical apparatus moves so that the engaged portion (insertion hole or insertion pin) approaches the engagement portion (positioning pin or positioning hole), and the engaged portion engages with the engagement portion at a predetermined position. Together they are positioned on the holding part. Thus, the projection optical device can be placed on the guide unit with a simple configuration, and the guide unit can guide the slide movement of the projection optical device.

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

According to this configuration, since the guide pin and the notch are provided as a pair on both sides of the optical axis, the projection optical apparatus is stably placed on the guide pin and is positioned in the holding portion. Can be moved stably. Accordingly, the operator can more easily position the projection optical apparatus on the holding unit.
In addition, when the pair of guide pins are arranged so that at least a part of each of the pair of guide pins can be seen from both sides of the lens barrel portion when viewed from above in the vertical direction, the operator mounts the projection optical device on the guide pins. Since it becomes easy to place, workability | operativity improves further.

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

  According to this configuration, the guide pin is configured to be detachable from the base portion by, for example, connection with a screw. As a result, the guide pin can be removed while the projection optical device is attached to the holding unit, so that it is unnecessary to provide a space for the guide pin in the projector, and the weight of the guide pin is It can be configured not to add to the 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, etc. while suppressing the increase in size and weight.

  Application Example 5 In the projector according to the application example described above, the engagement portion is formed on a positioning pin that protrudes toward the flange portion or the base portion, and a positioning hole that extends along an axis parallel to the optical axis. The engaged portion is one of an insertion hole formed in the flange portion and into which the positioning pin is inserted, or an insertion pin inserted into the positioning hole, and the guide portion. Protrudes from the base portion toward the flange portion and has a flat surface on the upper side in the vertical direction, and the contact portion protrudes from the flange portion and contacts the flat surface, and is parallel to the flat surface. It is preferable that the rotating member is rotatable about an axis.

According to this configuration, the operator moves the projection optical apparatus with a small force and positions the projection optical apparatus on the holding unit by placing the projection optical apparatus on the guide unit so that the rotating member contacts the flat surface. Can do. Therefore, it becomes easier to attach and detach the projection optical apparatus from the holding unit.
In addition, the projection optical device can be easily moved independently by bringing the rotating member into contact with the floor, the work table, or the like.

  Application Example 6 In the projector according to the application example described above, it is preferable that the flat surface has an inclined surface that is further away from the optical axis as the distance from the base portion increases 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 table, the inclined surface of the guide portion and the upper surface of the work table can be connected via a small step. It becomes. Thus, by pressing the projection optical device with the rotating member abutting the upper surface of the work table, the rotating member is continuously moved from the upper surface of the work table to the inclined surface without lifting the projection optical device from the work table. The projection optical device can be easily placed on the guide portion by rotating. Therefore, it is possible to further reduce the load on the operator.

  Application Example 7 In the projector according to the application example described above, the guide unit protrudes vertically upward from the flat surface, and in a first direction along a straight line that intersects the flat surface and a surface orthogonal to the optical axis. A pair of guide walls facing each other, and the pair of guide walls are spaced apart from each other in the first direction as the distance from the base portion decreases. It is preferable that the rotating member is formed in a size that fits.

  According to this configuration, the projection optical apparatus can be moved in directions other than the direction toward the base portion by the rotation of the rotation member, but the rotation member is directed toward the base portion by the guide wall described above. Be guided to. That is, if the operator places the projection optical device on the guide portion so that the rotating member contacts the flat surfaces inside the pair of guide walls and brings the flange portion closer to the base portion, the projection optical device can be rotated. The moving member is guided by the guide wall and moves toward a predetermined position of the holding portion. The pair of guide walls are formed at a separation distance in which the rotating member is fitted at the base end portion on the base portion side, so that the pair of guide walls are engaged at a position where the rotating member is fitted into the pair of guide walls. The joining portion can be configured to engage with the engaging portion. Therefore, it is possible to position the projection optical apparatus at a predetermined position of the holding portion with a light load while configuring the projection optical apparatus more easily and easily.

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

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

1 is a schematic diagram showing a schematic configuration of a projector according to a first embodiment. The perspective view which shows typically the projection lens and holding | maintenance part of 1st Embodiment. The figure for demonstrating the attachment procedure to the holding | maintenance part of the projection lens in 1st Embodiment. The perspective view which shows typically the projection lens and holding | maintenance part of 2nd Embodiment. The figure for demonstrating the attachment procedure to the holding | maintenance part of the projection lens in 2nd Embodiment. The perspective view which shows the projection lens and holding | maintenance part of 3rd Embodiment. The perspective view which shows the holding | maintenance part which removed the base part in 3rd Embodiment. The perspective view which shows a part of projection lens attached to the holding | maintenance part and holding | maintenance part in 3rd Embodiment.

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

[Main components of the projector]
FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector 1 according to the present embodiment.
As shown in FIG. 1, the projector 1 includes an exterior 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 illustration is omitted, a cooling device for cooling the optical unit 3, the power supply device 4, and the like is further arranged inside the exterior housing 2. In the following, for convenience of explanation, in the projector 1 placed on a desk or the like, the projection plane side is the + Y side (front side), the left side of the projector 1 viewed from the rear is the + X side (left side), and the upper side in the vertical direction is + Z It is described as the side (upper side).

Although detailed description is omitted, the exterior casing 2 is composed of a plurality of members, and is provided with an intake port for taking in outside air, an exhaust port for exhausting warm air inside the exterior housing 2 to the outside, and the like. .
The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and functions as a computer, 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. 1, 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 lens 5 as a projection optical device, and a projection lens. And a holding part 6 for holding 5 and an optical part casing 37 for arranging these optical parts at predetermined positions on the optical path.

  The light source device 31 includes a discharge-type light source 311 composed of an ultrahigh pressure mercury lamp, a metal halide lamp, and the like, a reflector 312 and the like. 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 partially superimposes the partial light on the light modulation device 351 described later together with the superimposing lens 324. The polarization conversion element 323 has a function of aligning random light emitted from the second lens array 322 with approximately one type of polarized light that can be used 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 “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 an R light light modulation device 351. The optical unit 3 has a configuration in which the relay optical system 34 guides the R light. However, the configuration is not limited thereto, and may be configured to guide the B light, for example.

The 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.

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

The holding unit 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, in which the projection lens 5 and the holding unit 6 are separated.
As shown in FIG. 2, the holding portion 6 includes a base portion 61, positioning pins 62 protruding from the base portion 61, and guide pins 63 as guide portions.

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

The guide pin 63 guides the projection lens 5 to a predetermined position of the holding unit 6 when the projection lens 5 is attached to the holding unit 6. The guide pin 63 guides the projection lens 5 when the projection lens 5 is removed from the holding unit 6.
As shown in FIG. 2, the guide pins 63 have a cylindrical shape, protrude from the + Y side surface of the base portion 61 in the + Y direction, that is, toward the flange portion 52, and are provided as a pair below the opening 611. ing. Further, the pair of guide pins 63 are viewed from above on both sides of the optical axis Ax, specifically, a lens barrel portion 51 (see FIG. 2), which will be described later, when viewed from above with the projection lens 5 mounted. Are arranged so that at least a part of each can be seen from both sides, and the tip of the positioning pin 62 is formed to protrude in the + Y direction.

[Projection lens mounting structure]
Here, a structure for attaching the projection lens 5 to the holding portion 6 will be described.
As shown in FIG. 2, the projection lens 5 includes a barrel portion 51 that houses a plurality of lenses, and a flange portion 52 that protrudes from the outer peripheral surface of the barrel portion 51 and faces the base portion 61 of the holding portion 6.
Although not shown in detail, the lens barrel 51 includes a lens frame, a guide tube, a cam tube, a focus tube, and the like.
Among the plurality of lenses, there is a lens that contributes to focus adjustment and zoom adjustment, and this lens is configured to be movable along the optical axis Ax.
The lens frame includes a frame portion that holds a lens that contributes to zoom adjustment, and a cam pin that extends from the frame portion in a direction orthogonal to the optical axis Ax.
The guide tube has a cylindrical portion and is formed with a straight groove along the optical axis Ax. In the lens frame, the cam pin is inserted into the rectilinear groove, and the frame portion is disposed so as to be movable in the guide tube. The guide tube also stores a lens that does not move along the optical axis Ax.

  The cam cylinder has a cam groove for defining the movement of the lens frame on the inner surface, and is formed in a cylindrical shape. A part of the guide tube is fitted into the cam tube, and a cam pin protruding from the straight groove is engaged with the cam groove. Then, the cam cylinder is rotated with respect to the guide cylinder, thereby guiding the cam pin between the rectilinear groove and the cam groove and moving the lens frame along the optical axis Ax.

  The focus cylinder holds a lens that contributes to focus adjustment and is arranged to be rotatable with respect to the guide cylinder. That is, zoom adjustment is performed when the cam cylinder is rotated, and focus adjustment is performed when the focus cylinder is rotated. Although not shown, the projection lens 5 of the present embodiment includes a mechanism having a motor or the like that independently rotates the cam cylinder and the focus cylinder, and is a so-called electric motor that performs zoom adjustment and focus adjustment according to instructions from the control unit. It consists of an expression.

  The flange portion 52 protrudes from the outer peripheral surface of the lens barrel portion 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 formed integrally with the guide tube, is formed in a rectangular shape when viewed from the direction along the optical axis Ax, and has a reference surface orthogonal to the optical axis Ax on the −Y side. ing. This reference surface comes into contact with 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 is engaged. In the projection lens 5, the cylindrical portion 62a of the positioning pin 62 is inserted into the insertion hole 521 of the flange portion 52 at a predetermined position. 52 abuts on the base portion 61 and is positioned on the holding portion 6.

  The notch 522 is provided in the lower end part of the flange part 52, and is formed in U shape in planar 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 are provided corresponding to the pair of guide pins 63. The notch 522 is set by inserting a guide pin 63 and filling the guide pin 63 with a play in the left-right direction (± X direction). The notch 522 is not limited to the U-shape, and may be a rectangular shape in plan view.

  The screw insertion hole 523 is formed at a position corresponding to the screw hole 61 </ b> S of the holding unit 6. In the projection lens 5, the cylindrical portion 62 a of the positioning pin 62 is inserted into the insertion hole 521 and positioned in the holding portion 6, and the screw inserted through the screw insertion hole 523 is screwed into the screw hole 61 </ b> S and fixed to the holding portion 6. Is done.

Next, a procedure for attaching the projection lens 5 to the holding unit 6 will be described.
FIG. 3 is a diagram for explaining a procedure for attaching 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. The holding unit 6 is attached to the optical component casing 37, but 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 disposed away from the positioning pin 62 and is restricted from moving in the left-right direction (± X direction).

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 to the holding portion 6 side, and the insertion hole 521 of the flange portion 52 is moved to the positioning pin 62 of the holding portion 6. Get closer to. Further, when the projection lens 5 is pushed 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. When the flange portion 52 is pushed until it comes into contact with 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 on 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 through the screw insertion hole 523 into the screw hole 61S.

When the projection lens 5 is removed from the holding portion 6, when the projection lens 5 is pushed in the + Y direction after removing the screw SC screwed into the screw hole 61S, the insertion hole 521 and the positioning pin 62 are engaged. Canceled. Then, when the positioning pin 62 is slid to a position where it is removed from 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 the flange portion 52 is brought close to the base portion 61 to be guided by the guide pin 63 and positioned on the holding portion 6. The projection lens 5 is guided by the guide pins 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 and positioned by the holding portion 6 until the flange portion 52 comes into contact with the base portion 61. Thus, if 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. In addition, since the projection lens is guided by the guide pin 63 even when it is removed from the holding unit 6, the operator can easily hold the positioning pin 62 and the insertion hole without holding the projection lens 5 positioned on the holding unit 6. The projection lens 5 can be removed by releasing the engagement with 521.
Therefore, even if it is a structure provided with the heavy projection lens 5, provision of the projector 1 which can be easily attached to and detached from the holding portion 6 of the projection lens 5 without placing a heavy burden on the operator is provided. It becomes possible.

  (2) The guide pin 63 guides the projection lens 5 so that the projection lens 5 slides. As a result, the degree of freedom in the shapes of the projection lens 5 and the holding unit 6 can be increased, and the configuration can be simplified. For example, in a configuration in which the projection optical device is positioned on the holding unit by rotating the projection optical device, the holding unit is formed or held so as not to have a shape in the region of the rotation locus of the projection optical device. Although it is necessary to configure the projection optical apparatus so that the region of the rotation trajectory of the projection optical apparatus in the unit is small, these restrictions are suppressed in the configuration of the present embodiment. That is, by providing the holding unit 6 with an area in which the projection lens 5 is slidable, for example, the opening 611 in the base unit 61, a configuration in which the projection lens 5 is easily guided by the guide pins 63 can be configured. .

(3) A pair of guide pins 63 are arranged on both sides of the optical axis Ax when viewed from above, and a pair of notches 522 are provided corresponding to the guide pins 63. As a result, the projection lens 5 can be stably placed on the guide pin 63 and can be stably moved in the direction in which the projection lens 5 is positioned. As a result, the operator can more easily position the projection lens 5 on the holding unit 6.
Further, since the pair of guide pins 63 are arranged so that at least a part of each of the guide pins 63 can be seen from both sides of the lens barrel portion 51 as viewed from above, the operator places the projection lens 5 on the guide pins 63. This improves the workability.

(Second Embodiment)
Hereinafter, a projector according to a second embodiment will be described 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 detailed description thereof is omitted or simplified.
The projector according to the present embodiment includes a projection lens 15 and a holding unit 16 that are different from the projection lens 5 and the holding unit 6 according to the first embodiment.

FIG. 4 is a perspective view schematically showing the projection lens 15 and the holding unit 16, in which the projection lens 15 and the holding unit 16 are separated.
As shown in FIG. 4, the holding portion 16 protrudes from the base portion 161 and has a positioning pin 62 as an engaging portion, 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 an 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 protruding upward from the flat surface FL.

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

The pair of guide walls 1631 oppose each other in the first direction along the straight line where the flat surface FL and the surface orthogonal to the optical axis Ax intersect, that is, the left-right direction. In addition, the pair of guide walls 1631 have a distance from each other in the first direction (left-right direction) that decreases as the distance from the base portion 161 approaches, and the projection lens 15 rotates at a base end portion on the base portion 161 side, which will be described later. The member 1531 is formed to fit. That is, the flat surface FL between the pair of guide walls 1631 is formed to be narrowest on the base portion 161 side in the first direction (left-right direction) and become wider as the distance from the base portion 161 increases.
Further, the base portion 161 is formed with a rectangular opening portion 1612 whose one side follows the base end surface 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 diagram simply showing the structure of the caster 153.
The flange portion 152 is not provided with the notch 522 of the flange portion 52 in the first embodiment, and an insertion hole 521 and a screw insertion hole 523 are formed similarly to the flange portion 52.

  The caster 153 is not shown in detail, but a support member (not shown) is supported on 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 rotation member 1531 (see FIG. 4) is provided that is supported so as to be rotatable about an axis along the XY plane. The rotating member 1531 is formed in a columnar shape, and corresponds to a contact portion that contacts the flat surface FL when the projection lens 15 is attached to and detached from the holding portion 16.

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

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

  Next, the projection lens 15 having the rotating member 1531 in contact with the work table TA is moved, and the projection lens 15 is placed on the inclined surface 163b from the front of the guide portion 163. And if the projection lens 15 is pushed and the inclined surface 163b is raised, the flange part 152 will approach the base part 161 gradually. The projection lens 15 can be moved in directions other than the direction approaching the base portion 161 side by the rotation of the rotation member 1531, but the rotation member 1531 is directed toward the base portion 161 side by the pair of guide walls 1631. The tapered portion 62 b of the positioning pin 62 is inserted into the insertion hole 521 by being guided.

Further, when the projection lens 15 is raised, the rotation member 1531 is fitted in the pair of guide walls 1631 in the left-right direction, and rotates on the base end surface 163a from the inclined surface 163b. Then, the projection lens 15 is pushed until the cylindrical portion 62a of the positioning pin 62 is inserted into the insertion hole 521, and the flange portion 152 comes into contact with the base portion 161. As shown in FIG. Is positioned. Further, a part of the caster that protrudes from the −Y side of the flange portion 152 is disposed in the opening portion 1612.
Then, similarly to the projection lens 5 of the first embodiment, 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.

When the projection lens 15 is removed from the holding portion 16, when the projection lens 15 is pushed in the + Y direction after removing the screw SC screwed into the screw hole 61S, the insertion hole 521 and the positioning pin 62 are engaged. Canceled. Then, the projection lens 15 is detached from the holding unit 16 by the rotation member 1531 rotating on the base end surface 163a and the inclined surface 163b.
As described above, the projection lens 15 is placed on the inclined surface 163b by the rotation member 1531 continuously rotating on the inclined surface 163b from the upper surface of the work table TA. Then, the projection lens 15 is positioned by the holding unit 16 by sliding the flat surface FL while the rotating member 1531 is guided by the pair of guide walls 1631. Further, the projection lens 15 is guided by the guide unit 163 and removed from the holding unit 16.

As described above, according to the projector of this embodiment, the following effects can be obtained.
(1) The operator places the projection lens 15 on the guide portion 163 so that the rotation member 1531 contacts the flat surface FL, thereby moving the projection lens 15 with a small force and positioning the projection lens 15 on the holding portion 16. be able to. Therefore, the attachment and detachment of the projection lens 15 to and from the holding unit 16 are further facilitated.
Further, the projection lens 15 can be easily moved independently by bringing the rotating member 1531 into contact with the floor, the work table TA, or the like.

  (2) Since the guide portion 163 has the inclined surface 163b, the projection lens 15 is placed on the guide portion 163 by continuously rotating the inclined surface 163b from the upper surface of the work table TA. Thereby, the projection lens 15 can be easily placed on the guide portion 163 without lifting the projection lens 15 from the work table TA. Therefore, it is possible to further reduce the load on the operator.

  (3) In the first direction (left-right direction), the projection lens 15 is placed from a part wider than the base part 161 side of the inclined surface 163b, and the rotating member 1531 is guided by the guide wall 1631 and positioned by the holding part 16. Is done. This makes it 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 more easily and easily.

(Third embodiment)
Hereinafter, a projector according to a third embodiment will be described 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 detailed description thereof is omitted or simplified.
In the first embodiment and the second embodiment, the projection lenses 5 and 15 positioned on the holding units 6 and 16 are fixed to the holding units 6 and 16 with screws, but the holding unit of this embodiment is also configured. Has a so-called spigot-type structure in which a member that rotates when the lever is operated is fixed, and the rotating member is engaged with a part of the projection lens to fix the projection lens.

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

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

As shown in FIG. 6, 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.
The base portion 71 does not have the screw hole 61S (see FIG. 2) provided in the base portion 61 of the first embodiment, and a notch 711 positioned 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 disposed on the −Y side of the base portion 71 so as to be rotatable 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. It has a function to do.
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 a circular opening 721 in a plan view through which the −Y side of the lens barrel 251 (see FIG. 6) is inserted, and a projection is formed on the periphery of the opening 721. A notch 722 into which the protrusion 2511 (see FIG. 6) of the lens 25 is inserted is provided. In addition, a recess 723 that is connected to the notch 722 and formed on the −Y side of the pressing member 72 is formed on the peripheral edge of the opening 721. The pressing member 72 has a plurality of arc-shaped long holes 724 centered on the optical axis Ax.

  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 a circular opening 731 in a 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. A columnar pin 732 is 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 portion of the pin 732. The coil spring 74 urges the pressing member 72 toward the receiving member 73 side.

  The lever 75 is a member that is 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, and one end is pivotally supported by the upper end of the pressing member 72 and the other end is operated to rotate the pressing member 72. Specifically, as shown in FIG. 6, the lever 75 is operated in a state extending along the pressing member 72 (a state indicated by a two-dot chain line in FIG. 6), thereby moving the pressing member 72 within a predetermined range. Rotate. Then, when the lever 75 is operated to the first state located on the leftmost side when 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 holding portion 7. The On the other hand, when the lever 75 is operated to the second state, which is located on the rightmost side when viewed from the front, the pressing member 72 is disposed at a position for fixing the projection lens 25 to the holding unit 7. In this second state, the lever 75 can be bent around a portion that is pivotally supported with respect to the pressing member 72 (a state indicated by a solid line in FIG. 6).

Here, a procedure for attaching the projection lens 25 to the holding unit 7 will be described.
First, the lever 75 is set to 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 pushed. When the light incident side of the lens barrel 251 is inserted through the opening 721, the projection lens 25 passes through the notch 722 and is positioned on the holding unit 7 as described in the first embodiment. .

  In a state where the projection lens 25 is positioned on the holding portion 7, the lever 75 is rotated clockwise as viewed from the front to enter 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 is engaged with the protrusion 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 portion 252 is pressed against the base portion 71. It is fixed to the holding part 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.
When the lever 75 is bent after the projection lens 25 is attached to the holding unit 7, the lever 75 rotates toward the optical axis Ax and is inserted into the notches 711 and 2521 as shown in FIG. It will be in the state arranged in parallel by the lens-barrel part 251. FIG.

  When removing the projection lens 25 from the holding unit 7, the lever 75 inserted through the notches 711 and 521 is raised, and the lever 75 is rotated counterclockwise as viewed from the front to be in the first state. Then, the projection lens 25 is removed from the holding unit 7 in the same manner as described in the first embodiment. 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 this embodiment, the following effects can be obtained.
The projection lens 25 positioned on the holding unit 7 can be fixed and released by a simple operation of rotating the lever 75.
Further, since the lever 75 is configured to be bendable, it is possible to set a length that is easy to operate when the projection lens 25 is attached or detached, and the projection lens 25 is fixed to the holding unit 7. The space for arranging the lever 75 in the projector can be saved.

(Modification)
In addition, you may change the said embodiment as follows.
The guide portion may be configured to be movable along the optical axis Ax. For example, a part that can be accommodated in the base unit and a guide unit that can change the amount of protrusion from the base unit is provided, and the projection optical device is placed on the guide unit that protrudes greatly from the base unit. You may comprise so that an optical apparatus may move with a guide part and may be positioned by a holding part.

You may comprise the guide pin 63 of 1st Embodiment so that attachment or detachment with respect to the base part 61 is possible. For example, a screw portion may be provided on one end side of the guide pin 63, and a screw hole to be screwed into the screw portion may be provided in the base portion 61. As a result, the guide pin 63 can be removed while the projection lens 5 is attached to the holding portion 6, so that it is not necessary to provide a space in which the guide pin 63 is disposed in the projector 1, or the guide pin 63. The weight of the projector 1 is not 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 detachable.

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

In the guide portion 163 of the second embodiment, the flat surface FL has the inclined surface 163b, but may be a flat surface that does not have the inclined surface 163b.
Moreover, although the guide part 163 of 2nd Embodiment is provided in the lower end part of the base part 161, it is not restricted to a lower end part, For example, optical axis Ax is located near the center from the lower end part in the up-down direction. A pair of guide portions having flat surfaces on both sides of the projection optical device may be provided, and a pair of casters corresponding to the pair of guide portions may be provided in the projection optical apparatus.

  In the second embodiment, a caster 153 having a columnar rotation member 1531 is used, but a spherical rotation member is used, and this spherical rotation member is used at the lower end of the flange portion, and a member such as a sheet metal is used. Then, it may be configured to support the roll.

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

  In the above-described embodiment, the method using screws and the spigot method are exemplified as the fixing method of the projection optical device. However, a bayonet method that is held by the holding unit by rotating the projection optical device may be used. In the case of this configuration, the insertion hole through which the positioning pin is inserted is formed in an arc shape. The guide unit on which the projection lens is placed is configured to guide the projection lens even when the projection lens is rotated.

  Even if the projector includes a lens shift mechanism that moves the projection optical device in a direction orthogonal to the optical axis Ax, and the holders 6, 16, and 7 of the embodiment constitute a part of the lens shift mechanism. Good. For example, you may comprise so that the holding parts 6, 16, and 7 can move to the left-right direction or an up-down direction with respect to the member arrange | positioned at -Y side of the holding parts 6, 16, and 7. FIG.

The projection lens 5 of the first embodiment is configured to be electrically operated for focus adjustment and zoom adjustment, but may be configured to be manually operated to manually rotate the cam cylinder and the focus cylinder.
Further, the projection lens 5 of the first embodiment is configured to optically perform focus adjustment and zoom adjustment, but may be configured by electronic adjustment in which zoom adjustment is performed by image processing. Further, the focus adjustment may be performed by the rotation of the cam cylinder.

  In the projector 1 of the embodiment, a transmissive liquid crystal panel is used as the light modulation device 351. However, a reflective liquid crystal panel may be used. 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 351 of the above embodiment employs a so-called three-plate method that uses three light modulation devices 351R, 351G, and 351B corresponding to R light, G light, and B light. A single plate method may be adopted, or the 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, 15, 25 ... Projection lens (projection optical apparatus), 6, 16, 7 ... Holding part, 31 ... Light source device, 37 ... Housing for optical components, 51,251 ... Mirror Tube portion, 52, 152, 252 ... Flange portion, 61, 71, 161 ... Base portion, 62 ... Positioning pin (engaging portion), 63 ... Guide pin (guide portion), 72 ... Pressing member, 73 ... Receiving member, 74 ... Coil spring, 75 ... Lever, 153 ... Caster, 163 ... Guide part, 163a ... Base end face, 163b ... Inclined surface, 311 ... Light source, 351, 351B, 351G, 351R ... Light modulator, 521 ... Insertion hole (engaged) 522 ... Notch (contact part), 523 ... Screw insertion hole, 1531 ... Rotating member (contact part), 1631 ... Guide wall, 2511 ... Projection, AX ... Optical axis, FL ... Flat surface.

Claims (8)

A projector comprising: a light source; a light modulation device that modulates light emitted from the light source; a projection optical device that projects light modulated by the light modulation device; and a holding unit that holds the projection optical device Because
The holding part is
A base portion having a surface perpendicular to the optical axis of the projection optical device;
An engaging portion for positioning the projection optical device;
A guide unit on which the projection optical device is mounted and guides the projection optical device to a predetermined position of the holding unit;
With
The projection optical device includes:
A lens barrel for storing a plurality of lenses;
A flange portion protruding from the outer peripheral surface of the lens barrel portion and facing the base portion;
An engaged portion that engages with the engaging portion at the predetermined position;
When the projection optical device is placed on the guide unit, a contact unit that contacts the guide unit;
With
The projector guides the projection optical apparatus so that the projection optical apparatus slides. The projector according to claim 1,
The engaging portion is either a positioning pin protruding toward the flange portion or a positioning hole formed in the base portion and along an axis parallel to the optical axis,
The engaged portion is formed in the flange portion, and is either an insertion hole into which the positioning pin is inserted or an insertion pin inserted into the positioning hole,
The guide portion is a guide pin that is formed vertically below the engagement portion and protrudes from the base portion toward the flange portion,
The projector is characterized in that the abutting portion is a notch into which the guide pin is inserted and is formed at an end portion of the flange portion on the lower side in the vertical direction. The projector according to claim 2,
A pair of the guide pins are arranged on both sides of the optical axis as seen from above in the vertical direction,
The projector is characterized in that a pair of the notches are provided corresponding to the guide pins. The projector according to claim 2 or 3, wherein
The projector is characterized in that the guide pin is configured to be detachable from the base portion. The projector according to claim 1,
The engaging portion is either a positioning pin protruding toward the flange portion or a positioning hole formed in the base portion and along an axis parallel to the optical axis,
The engaged portion is formed in the flange portion, and is either an insertion hole into which the positioning pin is inserted or an insertion pin inserted into the positioning hole,
The guide portion protrudes from the base portion toward the flange portion, and has a flat surface on the upper side in the vertical direction.
The projector, wherein the contact portion is a rotating member that protrudes from the flange portion, contacts the flat surface, and is rotatable about an axis parallel to the flat surface. The projector according to claim 5, wherein
The flat surface has an inclined surface that is further away from the optical axis as it is separated from the base portion in a direction along the optical axis. The projector according to claim 5 or 6, wherein
The guide portion has a pair of guide walls that protrude from the flat surface in the vertical direction and face each other in a first direction along a straight line intersecting the flat surface and a surface orthogonal to the optical axis,
The pair of guide walls are formed such that the distance between them in the first direction decreases as the distance from the base portion approaches, and the rotation member fits at the base end portion on the base portion side. A projector characterized by that. It is a projector as described in any one of Claims 5-7, Comprising:
The projector is characterized in that the guide part is configured to be detachable from the base part.

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