JP4923853B2 - projector - Google Patents

Description

  The present invention relates to a projector.

Conventionally, a projector is known that includes a light source lamp, a liquid crystal panel that modulates a light beam emitted from the light source lamp according to image information, and a projection lens that enlarges and projects the modulated light beam to the outside.
In a conventional projector, the projection lens has a fixed barrel arranged along the projection direction, and a frame having a focus lens screwed into the projection direction front end of the fixed barrel and arranged at the projection direction front end. And. Then, the projected image is adjusted by rotating the frame relative to the fixed barrel and moving the focus lens of the frame in the projection direction with respect to the fixed barrel (for example, Patent Document 1).

JP 2001-83387 A

  However, in the projector described in Patent Document 1, since the focus lens frame is positioned with respect to the fixed barrel only by the screwing portion, the focus lens is inclined with respect to the projection direction due to the gap of the screwing portion. In addition, since the tilt with respect to the projection direction of the focus lens is caused by an error in the processing dimension of the screwed portion, a favorable tilt accuracy with respect to the projection direction of the focus lens cannot be obtained, and the resolution performance of the projection lens is deteriorated. . For example, a phenomenon (single blurring phenomenon) has occurred in which only one end portion of a projected image is not focused. That is, there is a problem that the performance of the projection lens (projection optical device) cannot be obtained sufficiently.

  The objective of this invention is providing the projector which can maintain the lens performance of a projection optical apparatus favorably.

In order to achieve the above-described object, a projector according to the present invention includes a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, and forms an optical image, and displays the optical image on a screen. A projection optical device for enlarging and projecting to the projector, wherein the projection optical device includes a plurality of lens groups, a barrel that supports the entire projection optical device and is fixed inside the projector, and the barrel The first frame body is disposed at the front end portion of the projection direction and supports the focusing lens group among the plurality of lens groups and is movable in the projection direction with respect to the barrel, and is enlarged and projected onto the screen. A first image adjusting unit that adjusts a focus of a projected image; and a zoom lens group that is disposed in the lens barrel and supports the zoom lens group, and is projected onto the lens barrel by a cam mechanism And a zoom auxiliary ring that is arranged on the outer peripheral side of the lens barrel and is connected to the cam connector via the lens barrel and moves the cam connector by the cam mechanism. A second image adjusting unit for performing zoom adjustment of the projected image, wherein the first frame body is screwed with an outer periphery of a front end portion in the projection direction of the lens barrel, and the screwed A first extending portion that extends from the portion to the proximal end side in the projection direction of the lens barrel and has a contact portion that contacts the outer periphery of the lens barrel at the distal end portion in the extending direction. It arrange | positions at the outer peripheral side of a 1st frame, it extends toward the base end side from the projection direction front end side of the said projection optical apparatus, and connects to the said cam connection part via the said lens barrel in the extension direction front end part. It is characterized by that.
Here, the lens group includes both a lens group composed of two or more lenses and a lens group composed of a single lens.

In the present invention, a first extending portion is formed on the first frame body so as to extend from the threaded portion toward the proximal direction in the projection direction, and the abutting portion that abuts the outer periphery of the lens barrel at the distal end of the first extending portion. Is formed. As a result, even when the optical image projected by moving the first frame is adjusted, the first frame is composed of two parts, a screwing portion and a contact portion that are provided apart from each other in the projection direction. Positioning with respect to the lens barrel, the tilt accuracy with respect to the projection direction of the focusing lens group is improved. That is, the projection is performed without causing a tilt with respect to the projection direction of the focusing lens group due to the gap of the threaded portion, or without causing a tilt with respect to the projection direction of the focusing lens group due to an error in processing dimensions of the threaded portion. This prevents a phenomenon (single blurring phenomenon) in which only one end portion in one direction of an image is out of focus, and maintains the performance of the projection optical apparatus well.
By the way, by providing the first extension portion on the first frame body, the outer periphery on the base end side from the front end in the projection direction of the lens barrel is covered with the first extension portion. There is a problem that it is difficult to arrange a portion for operating the cam coupling portion on the proximal end side in the projection direction where the apparatus constituting the projector is disposed.
On the other hand, according to the present invention, a zoom auxiliary ring is provided at a portion where the cam connecting portion is operated, and the distal end portion in the extending direction of the zoom auxiliary ring is connected to the cam connecting portion via the lens barrel. Since it formed, the cam connection part can be operated via the zoom assist ring at the projection direction front end part of the projection optical apparatus. For example, if the zoom adjustment ring is disposed at the tip of the zoom assist ring so as to protrude from the opening of the exterior casing, the second image adjustment section can be operated from the outside of the exterior casing. Therefore, the operability of the second image adjustment unit is not inferior. For example, the operability of the projection optical apparatus can be realized without providing a configuration in which the cam coupling unit is operated electrically. be able to.

In the projector according to the aspect of the invention, it is preferable that the projector includes a projection position adjustment device that adjusts a projection position of the projection optical device by moving the projection optical device in a plane orthogonal to the projection direction.
According to such a configuration, when a projection position adjusting device that moves the projection optical device in a direction orthogonal to the projection direction is provided, even if the portion that operates the cam coupling unit moves together with the projection optical device, Since the zoom auxiliary ring is provided so that the cam coupling portion can be operated at the projection direction front end portion of the projection optical device, the operability of the projection optical device is maintained without deteriorating the operability of the projection optical device. be able to.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[1. (Appearance configuration)
FIG. 1 is a perspective view showing an appearance of the projector 1 as viewed from the upper front side.
The projector 1 modulates a light beam emitted from a light source lamp according to image information to form an optical image, and enlarges and projects the formed optical image on a screen (not shown). As shown in FIG. 1, the projector 1 includes a substantially rectangular parallelepiped outer casing 2 and a projection lens 10 as a projection optical device exposed from the outer casing 2.
Although specifically described later, the projection lens 10 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel, and the image light modulated according to image information by the apparatus main body of the projector 1 is used. Magnified projection.

The exterior casing 2 is a casing made of synthetic resin and houses the apparatus main body of the projector 1. As shown in FIG. 1, the outer casing 2 includes an upper case 21 that covers the upper part of the apparatus main body, a lower case 22 that covers the lower part of the apparatus main body, and a front case 23 that covers the front part of the apparatus main body (FIG. 1). ).
As shown in FIG. 1, the upper case 21 includes a top surface portion 21A, a side surface portion 21C, and a back surface portion (not shown) that respectively form the top surface, part of the side surface, part of the back surface, and part of the front surface of the exterior casing 2. And a front surface portion 21E.

As shown in FIG. 1, the top surface portion 21 </ b> A has a substantially rectangular shape in plan view, is gently curved from the substantially center portion in plan view to the front side, side surface side, and back side, and has a convex curved surface shape.
In the top surface 21A, two openings 21A1 and 21A2 are formed on the front side and on the right side when viewed from the front, as shown in FIG. The two openings 21A1 and 21A2 expose a part of the dials 861 and 871 for operating the projection lens 10 and adjusting the position of the projected image projected on the screen (not shown).

Specifically, as shown in FIG. 1, a dial 861 constituting a projection position adjusting device 8 (FIG. 3) to be described later is exposed from the opening 21 </ b> A <b> 1 on the front side of the upper surface and viewed from the front side. is doing. A dial 871 that similarly constitutes the projection position adjusting device 8 is exposed from the opening 21A2 on the left side as viewed from the front.
As shown in FIG. 1, when the dial 861 of the two dials 861 and 871 is rotated in the Y1 direction (forward direction), the projection lens 10 moves in the -Y direction (downward), and the dial 861 moves in the Y2 direction (rearward). When rotated in the direction), the projection lens 10 moves in the + Y direction (upward). Further, when the dial 871 is rotated in the X1 direction (rightward when viewed from the rear of the projector 1), the projection lens 10 moves in the -X direction (rightward), and the dial 871 is moved in the X2 direction (leftward when viewed from the rear of the projector 1). ), The projection lens 10 moves in the + X direction (left direction).
The detailed structure of the projection position adjusting device 8 will be described later.

In addition, in the top surface portion 21A, an operation panel 24 for starting and adjusting the projector 1 is provided on the rear side of the opening 21A1 so as to extend in the left-right direction, as shown in FIG. When the operation button 241 on the operation panel 24 is appropriately pressed, a tact switch mounted on a circuit board (not shown) arranged inside the operation button 241 is brought into contact with and a desired operation can be performed. In addition, an LED (Light Emitting Diode) (not shown) is attached to the circuit board, and emits light according to a predetermined operation.
The circuit board of the operation panel 24 described above is electrically connected to a control board (not shown), and an operation signal when the operation button 241 is pressed is output to the control board.

As shown in FIG. 1, the side surface portion 21 </ b> C, the back surface portion (not shown), and the front surface portion 21 </ b> E are portions that substantially hang down from each edge of the top surface portion 21 </ b> A having a rectangular shape in plan view.
Among these, as shown in FIG. 1, a cutout 21E1 having a U-shape in plan view is formed on the front surface portion 21E from the lower end edge to the upper side.

As shown in FIG. 1, the lower case 22 includes a bottom surface portion 22A, a side surface portion 22C, and a back surface portion (not shown) that respectively form the bottom surface, part of the side surface, part of the back surface, and part of the front surface of the exterior housing 2. ) And the front surface portion 22E.
The bottom surface portion 22A is configured by a substantially rectangular flat surface, although not specifically illustrated. The bottom surface portion 22A is formed with a plurality of legs that are grounded to a grounding surface such as a desk, and an air inlet for introducing external cooling air into the projector 1.

As shown in FIG. 1, the side surface portion 22C, the back surface portion (not shown), and the front surface portion 22E are portions that stand upward from each edge of the bottom surface portion 22A having a rectangular shape in plan view.
Further, as shown in FIG. 1, a cutout 22E1 having a U-shape in plan view is formed on the front surface portion 22E from the upper edge toward the lower side. In a state where the upper case 21 and the lower case 22 are combined, the front case 23 is formed at the U-shaped inner portion of the notch 21E1 of the front surface portion 21E and the U-shaped inner portion of the notch 22E1 of the front surface portion 22E. Supported and fixed.

As shown in FIG. 1, the front case 23 has a substantially elliptical shape extending in the left-right direction, and is connected to the upper case 21 and the lower case 22 to close the openings formed by the notches 21E1 and 22E1. To do.
As shown in FIG. 1, the front case 23 is formed with a recess on the inner side of the exterior housing 2 and a substantially circular opening 231 in the bottom portion, as shown in FIG. The opening 231 exposes the tip portion of the projection lens 10.
Further, in the front case 23, as shown in FIG. 1, a remote control light receiving window 232 is formed at a substantially central portion in the longitudinal direction. A remote control light receiving module (not shown) for receiving an operation signal from a remote controller (not shown) is disposed inside the remote control light receiving window 232.
The remote controller is provided with the same start switch, adjustment switch and the like provided on the operation panel 24 described above. When the remote controller is operated, an infrared signal corresponding to this operation is output from the remote controller. The infrared signal is received by the remote control light receiving module through the remote control light receiving window 232 and processed by a control board (not shown).

Further, in the front case 23, an exhaust port 233 having a rectangular shape in a plan view for discharging the air heated inside the projector 1 to the outside is formed on the left side as viewed from the front, as shown in FIG. Has been.
Further, as shown in FIG. 1, the peripheral portion of the exhaust port 233 is formed to have a cylindrical shape protruding toward the inside. More specifically, the peripheral edge portion of the exhaust port 233 is formed to have a cylindrical shape that protrudes inclined with respect to the projection direction from the projection lens 10 toward the direction close to the projection lens 10. As shown in FIG. 1, a plurality of vane plates 233 </ b> A that extend in the vertical direction and extend in the protruding direction of the peripheral portion of the exhaust port 233 are formed in the cylindrical inner portion of the exhaust port 233.

[2. Internal configuration)
An apparatus main body of the projector 1 is accommodated in the exterior casing 2. Although not shown, the apparatus main body includes an optical unit as an image projection apparatus, a power supply unit, a cooling unit, and the like.
The apparatus main body includes an optical unit, a power supply unit, a cooling unit, a control board that is disposed above the optical unit and controls the entire projector 1.

[3. Detailed configuration of the optical unit)
FIG. 2 is a plan view schematically showing an optical system of the optical unit 4.
The optical unit 4 forms image light according to image information under the control of the control board. Although not shown, the optical unit 4 has an L-shape in a plan view that extends in the left-right direction along the back surface and extends forward along the side surface on the opposite side of the side surface portion 22C. is doing.
As shown in FIG. 2, the optical unit 4 houses an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an electro-optical device 44, and optical components 41 to 44 therein. In addition, an optical component housing 45 made of synthetic resin for supporting and fixing the projection lens 10 at a predetermined position is provided.
The integrator illumination optical system 41 is an optical system for illuminating an image forming area of each liquid crystal panel, which will be described later, constituting the electro-optical device 44 substantially uniformly. As shown in FIG. 2, the integrator illumination optical system 41 includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415.

The light source device 411 includes a light source lamp 411A as a light source that emits a radial light beam, a reflector 411B that reflects the emitted light emitted from the light source lamp 411A, and a lamp housing 411C (FIG. 2). As the light source lamp 411A, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is often used. A parabolic mirror is used as the reflector 411B. In addition to a parabolic mirror, an ellipsoidal mirror may be used together with a collimating concave lens.
The lamp housing 411 </ b> C houses the light source lamp 411 </ b> A and the reflector 411 </ b> B inside, and is attached to the bottom surface portion of the lower case 22 and connected to the optical component housing 45.

The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis direction are arranged in a matrix. Each small lens divides the light beam emitted from the light source lamp 411A into a plurality of partial light beams.
The second lens array 413 has substantially the same configuration as the first lens array 412, and has a configuration in which small lenses are arranged in a matrix. The second lens array 413, together with the superimposing lens 415, has a function of forming an image of each small lens of the first lens array 412 on a liquid crystal panel described later.

The polarization conversion element 414 is disposed on the downstream side of the optical path of the second lens array 413. Such a polarization conversion element 414 converts the light from the second lens array 413 into substantially one type of polarized light, thereby improving the light use efficiency in the electro-optical device 44.
Specifically, each partial light converted into approximately one type of polarized light by the polarization conversion element 414 is finally substantially superimposed on each liquid crystal panel (described later) of the electro-optical device 44 by the superimposing lens 415. Since only one type of polarized light can be used in the projector 1 of this embodiment using a liquid crystal panel of a type that converts polarized light, almost half of the luminous flux from the light source lamp 411A that emits other types of randomly polarized light is used. Not. For this reason, by using the polarization conversion element 414, almost all the light beams emitted from the light source lamp 411A are converted into one type of polarized light, and the use efficiency of light in the electro-optical device 44 is enhanced.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the integrator illumination optical system 41 by the dichroic mirrors 421 and 422 are red, green, and blue. It has a function of separating into three color lights.
The relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and has a function of guiding the color light separated by the color separation optical system 42 to a blue light liquid crystal panel.

  At this time, the dichroic mirror 421 of the color separation optical system 42 transmits the blue light component and the green light component of the light beam emitted from the integrator illumination optical system 41 and reflects the red light component. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 417, and reaches the liquid crystal panel for red light. The field lens 417 converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 417 provided on the light incident side of the other liquid crystal panels for green light and blue light.

  Of the blue light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 417, and reaches the liquid crystal panel for green light. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, and further passes through the field lens 417 to reach the liquid crystal panel for blue light. Note that the relay optical system 43 is used for blue light because the optical path length of the blue light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light diffusion or the like. It is to do. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 417 as it is. The relay optical system 43 is configured to pass blue light of the three color lights, but is not limited thereto, and may be configured to pass red light, for example.

The electro-optical device 44 includes three liquid crystal panels 441 (red light liquid crystal panel 441R, green light liquid crystal panel 441G, blue light liquid crystal panel 441B) and a polarization plate. A plate 442, a viewing angle correction plate 444, and a cross dichroic prism 443 are provided.
The liquid crystal panel 441 uses, for example, a polysilicon TFT (Thin Film Transistor) as a switching element, and each color light separated by the color separation optical system 42 is incident on these three liquid crystal panels 441 and their light fluxes. An optical image is formed by being modulated according to image information by the polarizing plates 442 on the side and the exit side.

The polarizing plate 442 includes an incident-side polarizing plate 442A and an emission-side polarizing plate 442B that are arranged at the front stage and the rear stage of the optical path of the liquid crystal panel 441.
The incident-side polarizing plate 442A transmits only polarized light in a certain direction out of each color light separated by the color separation optical system 42 and absorbs other light beams. The incident-side polarizing plate 442A is a polarizing film on a substrate made of quartz or sapphire. Is affixed. The incident-side polarizing plate 442A is arranged so that the position of the incident-side polarizing plate 442A can be adjusted with respect to a predetermined illumination optical axis set in the optical component casing 45 by a position adjusting mechanism which will be described later. Has been.

The exit-side polarizing plate 442B is configured in substantially the same manner as the incident-side polarizing plate 442A, and transmits only polarized light in a predetermined direction and absorbs other light beams out of the light beams emitted from the liquid crystal panel 441. Further, the polarizing film may be attached to the cross dichroic prism 443 without using the substrate, or the substrate may be attached to the cross dichroic prism 443.
The incident side polarizing plate 442A and the emission side polarizing plate 442B are set so that the directions of the polarization axes thereof are orthogonal to each other.

  The viewing angle correction plate 444 is obtained by forming an optical conversion film having a function of correcting the viewing angle of an optical image formed by the liquid crystal panel 441 on a substrate. By disposing such a viewing angle correction plate 444, light leakage at the time of a black screen is reduced and the contrast of the projected image is greatly improved. The viewing angle correction plate 444 is a predetermined illumination set in the optical component casing 45 by a position adjusting mechanism, which will be described later, constituting the optical component casing 45 in substantially the same manner as the incident-side polarizing plate 442A. The position is adjustable with respect to the optical axis.

  The cross dichroic prism 443 forms a color image by combining images modulated for each color light emitted from the three liquid crystal panels 441. In the cross dichroic prism 443, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the dielectric multilayer film.

Each of the optical systems 41 to 44 described above is accommodated in the optical component housing 45.
As shown in FIG. 2, the optical component housing 45 has an illumination optical axis A of a light beam emitted from the light source device 411 set therein, and the optical components 412 to 415, 417, 421 to 423, and 431 described above. ˜434, 442A, 444 are respectively provided with a container-like component storage member 451 provided with a groove (not shown) that is slidably fitted from above, and a lid-like lid-like member that closes the upper opening of the component storage member 451 (Not shown) and a position adjusting mechanism (not shown) that includes a part of the lid-like member and adjusts the positions of both the incident-side polarizing plate 442A and the viewing angle correction plate 444.
In addition, a light source device 411 is disposed at one end side of the optical component housing 45 having a substantially L shape in plan view at a predetermined position with respect to the illumination optical axis A (FIG. 2), and the illumination optical axis is disposed at the other end side. The projection lens 10 is fixed at a predetermined position with respect to A. In addition, an electro-optical device 44 is fixed in the preceding stage of the optical path of the projection lens 10. Further, the lens barrel of the projection lens 10 is attached to a projection position adjusting device 8 described later.

[4. Configuration of Projection Position Adjustment Device 8]
3 and 4 are diagrams showing the structure of the projection position adjusting device 8. Specifically, FIG. 3 is a perspective view of the projection position adjusting device 8 as viewed from the rear side of the optical path, and FIG. 4 is an exploded perspective view of the projection position adjusting device 8.
3 and 4, for convenience of explanation, the projection direction from the projection lens 10 is a Z axis, and two axes orthogonal to the Z axis are an X axis (horizontal axis) and a Y axis (vertical axis).

  The projection position adjusting device 8 adjusts the projection position (movement position) of the projection lens 10. As shown in FIG. 4, the projection position adjusting device 8 includes a fixed plate 81, a first moving plate 82, a second moving plate 83, an auxiliary plate 84, a support plate 85, and a first adjustment. A drive unit 86, a second adjustment drive unit 87, a biasing member 88, and a shift cover 89 are provided.

The fixed plate 81 is a portion that is fixed to the optical component housing 45 (FIG. 2) and supports the projection position adjusting device 8 as a whole. As shown in FIG. 4, the fixing plate 81 has a substantially rectangular shape in plan view.
In the fixed plate 81, a substantially circular opening 811 that allows the lens barrel 11 of the projection lens 10 to be inserted is formed in a substantially central portion.
Then, the first moving plate 82 slides on the peripheral portion of the opening 811 at the + Z axial direction end surface of the fixed plate 81.

The fixing plate 81 is formed with five fixing holes 812 surrounding the opening 811. The fixing plate 81 is fixed to the optical component housing 45 by screwing screws (not shown) into the screw holes (not shown) formed on the side surfaces of the optical component housing 45 through the fixing holes 812. Is done.
Further, in the fixing plate 81, five fixing holes 813 are penetrated in the Z-axis direction at the peripheral edge portion of the end surface orthogonal to the Z-axis direction of the fixing plate 81 as shown in FIG. A screw (not shown) is inserted into the fixing hole 813, and the screw is screwed into a fixing cylinder 842 of the auxiliary plate 84 described later, whereby the fixing plate 81 and the auxiliary plate 84 are connected. Is done.

In the fixing plate 81, a fixing cylinder 814 protruding in the + X-axis direction is formed on the + Y-axis direction end portion side (upper end portion side) of the + X-axis direction end surface. The fixing cylinder 814 is formed with a screw hole from the end surface in the + X-axis direction toward the −X-axis direction.
In the fixing plate 81, a fixing screw hole 815 is formed toward the −X axis direction on the −Y axis direction end portion side (lower end portion side) of the + X axis direction end surface.

In the fixing plate 81, two screw holes 816 for fixing the shift cover 89 and positioning protrusions 817 are formed on the end surface (upper end surface) in the + Y-axis direction, as shown in FIG. .
Further, in the fixed plate 81, a plurality of reinforcing ribs 818 are erected on the + Z axial direction end surface as shown in FIG. By providing such a reinforcing rib 818, the influence of the external force on the projection position adjusting device 8 is mitigated, and the deviation of the projection position due to the external force is suppressed.

The first moving plate 82 has a substantially rectangular shape in plan view smaller than the fixed plate 81 and is disposed on the + Z axis direction side with respect to the fixed plate 81 as shown in FIG. The first moving plate 82 abuts on the peripheral portion of the opening 811 on the + Z-axis direction end face of the fixed plate 81 and is configured to be movable in the Y-axis direction and the X-axis direction. The first moving plate 82 supports and fixes the projection lens 10 and moves, thereby moving the projection lens 10 in the Y-axis direction and the X-axis direction.
In the first moving plate 82, an opening 821 through which the lens barrel 11 of the projection lens 10 can be inserted is formed at a substantially central portion as shown in FIG.
The opening 821 is formed to have a dimension close to the outer dimension of the lens barrel 11 in order to reduce a gap with the outer peripheral end of the lens barrel 11. By forming in this way, it is possible to prevent light from leaking from the gap between the lens barrel 11 and the opening 821, and dust or the like from entering the inside of the projector 1.

  In the first moving plate 82, fixing holes corresponding to the fixing holes 112A of the flange portion 112 (FIG. 7) of the projection lens 10 are provided at the four corner positions on the periphery of the opening 821, as shown in FIG. 822 is formed. Then, with the lens barrel 11 of the projection lens 10 inserted through the opening 821, a screw (not shown) is fixed from the + Z axis direction (opposite to the projection direction) through the fixing hole 112A of the flange portion 112. The projection lens 10 is fixed to the first moving plate 82 by being screwed into the hole 822. That is, the first moving plate 82 supports and fixes the projection lens 10 at the end surface facing the fixed plate 81.

Further, in the first moving plate 82, as shown in FIG. 4, urging holes 823 are formed at the four corner positions on the end face in the + Z-axis direction. The urging members 88 described later are disposed in the urging holes 823, respectively.
In the first moving plate 82, on the + X-axis direction end portion side of the + Z-axis direction end face, as shown in FIG. 4, a rail groove 824 is provided in the −Z-axis direction and extends along the Y-axis direction. Is formed.

Further, in the first moving plate 82, as shown in FIG. 4, a moving projection 825 and a moving projection 826 are respectively projected in the + X axis direction at a substantially central portion of the + X axis direction end surface in the Y axis direction. Is formed.
Both of the moving projections 825 and 826 are inserted into track holes 856 of the support plate 85 described later. Among these, the moving projection 825 engages with a drive gear of a first adjustment drive unit 86 described later on the −X axis direction side of the support plate 85 and receives the force of the drive gear. These moving projections 825 and 826 are formed with screw holes (not shown) from the end surface in the + X-axis direction toward the −X-axis direction.
A reinforcing plate 826A is formed on the + Y-axis direction side of the moving protrusion 826 so as to protrude along the moving protrusion 826 from the + X-axis direction end face of the first moving plate 82. This reinforcing plate 826A is integrated with the moving projection 826 at the end in the −Y-axis direction.

As shown in FIG. 4, a bridging member 827 described below is bridged on the + X axial direction end surfaces of the moving projections 825 and 826.
The bridging member 827 is a long member extending in the Y-axis direction, and fixing holes 827A and 827B penetrating in the X-axis direction are formed at both ends (upper and lower ends) of the Y-axis. . The distance between the fixing holes 827A and 827B in the Y-axis direction coincides with the distance between the moving protrusions 825 and 826 in the Y-axis direction.
The bridging member 827 is joined to the + X axial end surfaces of the moving projections 825 and 826 by screws 827C screwed into the screw holes of the moving projections 825 and 826 through the fixing member fixing holes 827A and 827B. The

By forming and joining the bridging member 827 to the moving protrusion 826, the strength of the moving protrusion 825 in the Y-axis direction can be reinforced. That is, the moving projection 825 receives force from the drive gear, and thus may be easily broken in the Y-axis direction. However, since the moving protrusion 826 is formed on the −Y axis direction side of the moving protrusion 825, and the bridging member 827 is bridged in the Y axis direction with respect to the moving protrusions 825 and 826, the force applied to the moving protrusion 825 is The movable protrusion 826 and the bridging member 827 can be dispersed. Furthermore, since the reinforcing plate 826A is formed on the moving protrusion 826, the moving protrusion 826 can be made difficult to break and the moving protrusion 825 can be further reinforced.
Further, the first moving plate 82 is moved in the X-axis direction together with the second moving plate 83. The moving protrusions 825 and 826 and the reinforcing plate 826A have dimensions sufficiently long in the X-axis direction so that the first moving plate 82 can move to the maximum in the −X-axis direction with respect to the support plate 85. .

  In the first moving plate 82, a plurality of reinforcing ribs 828 are erected on the end surface in the + Z-axis direction, as shown in FIG. By providing such a reinforcing rib 828, the influence of the external force on the projection position adjusting device 8 is mitigated, and the deviation of the projection position due to the external force is suppressed.

The second moving plate 83 has the same shape as the first moving plate 82 and is arranged on the + Z axis direction side with respect to the first moving plate 82 as shown in FIG. The second moving plate 83 is configured to be movable in the X-axis direction, engages with the first moving plate 82, and moves to move the first moving plate 82 in the X-axis direction.
In the second moving plate 83, a sliding protrusion 830 extending along the Y-axis direction is formed on the end surface in the −Z-axis direction at a position corresponding to the rail groove 824 of the first moving plate 82. The sliding protrusion 830 is engaged with the rail groove 824 of the first moving plate 82 in a state where the projection position adjusting device 8 is combined. Thereby, the first moving plate 82 is guided by the rail groove 824 and the sliding projection 830 and moves in the Y-axis direction with respect to the second moving plate 83. Further, the first moving plate 82 moves in the X-axis direction in conjunction with the movement of the second moving plate 83 in the X-axis direction by the rail groove 824 and the sliding protrusion 830.

As shown in FIG. 4, the second moving plate 83 has an opening 831 through which the lens barrel 11 in the projection lens 10 can be inserted, as shown in FIG. 4.
When the first moving plate 82 moves with respect to the second moving plate 83 and the projection lens 10 moves, the opening 831 has an outer peripheral end of the lens barrel 11 and an inner peripheral end of the opening 831. Has a shape larger than the outer peripheral shape of the lens barrel 11 so as not to interfere mechanically.

  Further, in the second moving plate 83, a concave portion 832 recessed in the −Z-axis direction is formed at the corner of the + Z-axis direction end face on the + Y-axis direction side (upper side) as shown in FIG. ing. In the recess 832, a dial gear, an intermediate gear, and a drive gear that constitute the second adjustment drive unit 87 are arranged. As shown in FIG. 4, the concave portion 832 is formed with a moving projection 833 that protrudes in the + Z-axis direction, engages with the drive gear, and receives the force of the drive gear.

Furthermore, in the second moving plate 83, on the −Y-axis direction end portion side of the + Z-axis direction end surface, as shown in FIG. 4, it protrudes in the + Z-axis direction and extends along the X-axis direction. An engaging protrusion 834 is formed to engage with.
In addition, in the second moving plate 83, a concave portion 835 having a substantially semicircular cross section in the XY plane is provided at a substantially central portion in the X-axis direction at the + Y-axis direction end (upper end) as shown in FIG. Is formed. A biasing member 88 to be described later is disposed in the recess 835.

  In the second moving plate 83, a plurality of reinforcing ribs 836 are erected on the end surface in the + Z-axis direction excluding the recess 832 as shown in FIG. By providing such a reinforcing rib 836, the influence of the external force on the projection position adjusting device 8 is mitigated, and the deviation of the projection position due to the external force is suppressed.

The auxiliary plate 84 has the same shape as the fixed plate 81 and is disposed on the + Z-axis direction side with respect to the second moving plate 83 as shown in FIG. 82 and the second moving plate 83 are sandwiched.
As shown in FIG. 4, the auxiliary plate 84 is formed with an opening 841 through which the lens barrel 11 of the projection lens 10 can be inserted.
The opening 841 is larger than the outer peripheral shape of the lens barrel 11 so that the outer peripheral end of the lens barrel 11 and the inner peripheral end of the opening 841 do not mechanically interfere when the projection lens 10 moves. It has a shape.

As shown in FIG. 4, the auxiliary plate 84 protrudes in the −Z-axis direction on the end surface in the −Z-axis direction so as to correspond to the positions of the five fixing holes 813 of the fixing plate 81 and is connected to the fixing plate 81. Five fixing cylinders 842 for this purpose are formed.
These fixing cylinders 842 are internally formed with screw holes toward the + Z axis. Then, with the fixing cylinder 842 in contact with the fixing hole 813 of the fixing plate 81, a screw is screwed into the screw hole of the fixing cylinder 842 through the fixing hole 813, so that The auxiliary plate 84 is fixed.

Further, in the auxiliary plate 84, a concave portion 843 recessed in the −Z-axis direction as shown in FIG. 4 is provided at the corner portion on the + Y-axis direction side (upper side) of the + Z-axis direction end surface on the −X-axis direction side. Is formed. A dial 871 constituting the second adjustment driving unit 87 is disposed in the recess 843.
Further, as shown in FIG. 4, the recess 843 is formed with a shaft support portion 844 that protrudes in the + Z-axis direction and has an insertion hole 844A formed therein. The shaft support portion 844 is inserted into the insertion hole 844A with a rotation shaft of a dial gear constituting the second adjustment drive portion 87, and rotatably supports the dial 871 and the dial gear.

  A rotating shaft 845A (FIG. 6) that rotatably supports the intermediate gear of the second adjustment drive unit 87 is formed on the back surface (−Z-axis direction end surface) of the recess 843. Further, on the −Z-axis direction end surface, a rotation shaft 845B (FIG. 6) that rotatably supports the drive gear of the second adjustment drive unit 87 on the −Y-axis direction side (downward side) of the rotation shaft 845A. ) Is formed.

In the auxiliary plate 84, at the + Y-axis direction end (upper end), as shown in FIG. 4, two positioning projections 846A for positioning the shift cover 89 and two screw holes 846B for fixing are provided. Is formed.
Further, in the auxiliary plate 84, fixing cylinders 847A and 847B (FIG. 6) for fixing the support plate 85, a dial gear of the first adjustment driving unit 86, and a second intermediate gear are provided on the end surface in the + X-axis direction. Further, rotation shafts 848A, 848B, and 848C (FIGS. 5 and 6) for rotatably supporting the drive gear are formed. Note that screw holes are formed in the fixing cylinders 847A and 847B in the −X axis direction.
Further, in the auxiliary plate 84, a plurality of reinforcing ribs 849 are erected on the end surface in the + Z-axis direction, as shown in FIGS. By providing such a reinforcing rib 849, the influence of the external force on the projection position adjusting device 8 is mitigated, and the deviation of the projection position due to the external force is suppressed.

  In the auxiliary plate 84, an engagement recess 840 (FIG. 6) extending along the X-axis direction is formed on the end surface in the −Z-axis direction at a position corresponding to the engagement protrusion 834 of the second moving plate 83. Yes. The engagement recess 840 is formed to have a length dimension that is larger than the dimension obtained by adding the amount of movement of the second moving plate 83 in the X-axis direction to the length dimension of the engagement protrusion 834 in the X-axis direction. ing. In a state where the projection position adjusting device 8 is combined, the engagement protrusion 834 of the second moving plate 83 is inserted into the engagement recess 840 of the auxiliary plate 84. The second moving plate 83 is guided by the engaging protrusion 834 and the engaging recess 840 and moves in the X-axis direction with respect to the auxiliary plate 84.

As shown in FIGS. 3 and 4, the support plate 85 is disposed on the + X axis direction side with respect to the fixed plate 81, the first moving plate 82, the second moving plate 83, and the auxiliary plate 84. While supporting the adjustment drive part 86, it is a part which reinforces the connection state of the fixed board 81 and the auxiliary | assistant board 84. FIG.
In the support plate 85, as shown in FIG. 4, a portion 852 on the −Y axis direction side (downward side) and a portion 851 on the + Y axis direction side (upper side) bulge in the + X axis direction. .
In this support plate 85, on the + Y axis direction side (upper side) of the portion 851, a shaft support portion 853 penetrating the front and back is formed as shown in FIG. A shaft portion of a dial gear constituting the first adjustment drive portion 86 is inserted into the shaft support portion 853, and the dial 861 and the dial gear are rotatably supported.

Further, in this support plate 85, the corners on the + Z-axis direction side on the + Y-axis direction side (upper side) of the portion 851 and the + Z-axis direction side on the −Y-axis direction side (lower side) of the portion 851. The fixing holes 854A and 854B are formed.
The support plate 85 is fixed to the auxiliary plate 84 by screws screwed into the screw holes of the fixing tubes 847A and 847B of the auxiliary plate 84 through the fixing holes 854A and 854B.
Further, in this support plate 85, a portion 851 includes a fixing hole 855A and a fixing hole 855B at positions corresponding to the fixing cylinder 814 and the fixing screw hole 815 of the fixing plate 81 as shown in FIG. Is formed. The support plate 85 is fixed to the fixing plate 81 by screwing screws into the fixing cylinder 814 and the fixing screw hole 815 of the fixing plate 81 via the fixing holes 855A and 855B.

In the support plate 85, a track hole 856 is formed from the portion 851 to the portion 852 at positions corresponding to the movement protrusions 825 and 826 of the first moving plate 82 as shown in FIG. As shown in FIG. 4, the track hole 856 is formed to extend in the Y-axis direction.
In a state where the projection position adjusting device 8 is assembled, the moving projections 825 and 826 are inserted into the track holes 856, and the moving projections 825 and 826 mechanically interfere with the support plate 85 according to the movement of the first moving plate 82. It is avoided.

FIG. 5 is a diagram showing the structure of the first adjustment drive unit 86. Specifically, FIG. 5 is a diagram in which the support plate 85 is removed from the projection position adjusting device 8 as viewed from the + X-axis direction. In FIG. 5, as in FIGS. 3 and 4, the projection direction from the projection lens 10 is the Z axis, and two axes orthogonal to the Z axis are the X axis (horizontal axis) and the Y axis (vertical axis). To do.
The first adjustment drive unit 86 is a part that moves the first moving plate 82 in the Y-axis direction by a user operation and changes the projection position of the projection lens 10 in the Y-axis direction. As shown in FIG. 4 or FIG. 5, the first adjustment drive unit 86 includes a dial 861 (FIG. 4), a dial gear 862, a first intermediate gear 863, a second intermediate gear 864, and a drive gear 865. With.

  The dial 861 is an operation unit that is partly exposed from the upper surface of the upper case 21 in the exterior casing 2 and operated by the user. As shown in FIG. 4, the dial 861 has a substantially cylindrical shape, is formed in a lid shape having a space inside, and is arranged on the + X axis direction side of the support plate 85. A fixing hole is formed at the center of the dial 861.

The dial gear 862 engages with the dial 861, rotates together with the dial 861, and transmits the rotation to the first intermediate gear 863. As shown in FIG. Be placed. As shown in FIG. 4 or 5, the dial gear 862 includes a shaft portion 862A and a gear 862B.
The shaft portion 862A has a cylindrical shape, and a screw hole (not shown) is formed from the tip surface toward the shaft portion 862A side. The dial 861 is pivotally supported by the support plate 85 by screwing the screw through the central hole of the dial 861 and the support plate 85 via the 853 into the screw hole of the shaft portion 862A from the + X-axis direction. The
The gear 862B is connected to the base end portion of the shaft portion 862A, meshes with a first gear described later of the first intermediate gear 863, and transmits the rotation of the dial 861 to the first intermediate gear 863. As shown in FIG. 5, a circular hole 862B1 is formed at the rotation center of the gear 862B. When the projection position adjusting device 8 is assembled, the circular hole 862B1 is inserted into the rotation shaft 848A of the auxiliary plate 84. The dial gear 862 is rotatably supported on the rotation shaft 848A.

The first intermediate gear 863 meshes with the gear 862B of the dial gear 862 and the gear 864A of the second intermediate gear 864, and is disposed on the −X axis direction side of the support plate 85. The first intermediate gear 863 transmits the rotation of the dial gear 862 to the second intermediate gear 864.
As shown in FIG. 4, the second intermediate gear 864 includes a first gear 864A having a large diameter and a second gear 864B having a small diameter, which are integrally formed. Arranged on the axial side.
The first gear 864A meshes with the first intermediate gear 863.
The second gear 864B meshes with the meshing portion of the drive gear 865, and transmits the rotation of the first intermediate gear 863 to the drive gear 865 together with the first gear 864A. As shown in FIG. 5, a circular hole 864 </ b> C is formed at the rotation center of the second intermediate gear 864, and when the projection position adjusting device 8 is assembled, the circular hole 864 </ b> C is a rotation axis of the auxiliary plate 84. The second intermediate gear 864 is pivotally supported on the rotation shaft 848B by being inserted into 848B.

As shown in FIG. 4 or FIG. 5, the drive gear 865 has a fan shape in plan view and is disposed on the −X axis direction side of the support plate 85. As shown in FIG. 5, the drive gear 865 includes a gear body 865A and a meshing portion 865B.
The gear main body 865A is a portion that is rotatably supported by the rotation shaft 848C of the fixed plate 81, and a circular hole 865C through which the rotation shaft 848C of the auxiliary plate 84 can be inserted is formed at the base end portion. .
The gear main body 865A is formed with a track hole 865D extending radially from the center position of the circular hole 865C. The moving projection 825 of the first moving plate 82 is inserted into the track hole 865D in a state where the projection position adjusting device 8 is assembled.
The meshing portion 865B is formed in an arc-shaped portion at the tip portion of the gear body 865A and meshes with the second gear 864B of the second intermediate gear 864.

With the above configuration, when the user rotates the dial 861 in the Y1 direction (FIG. 5), the rotation of the dial 861 is driven by the dial gear 862, the first intermediate gear 863, and the second intermediate gear 864. And the drive gear 865 rotates in the Y5 direction (FIG. 5) about the rotation shaft 848C.
At this time, the moving projection 825 is guided by the track hole 865D, and the first moving plate 82 moves in the −Y axis direction (downward). Then, together with the first moving plate 82, the projection lens 10 moves in the -Y axis direction (downward), and the projection position is adjusted in the -Y axis direction (downward).
When the user rotates the dial 861 in the Y2 direction (FIG. 5), the drive gear 865 rotates in the Y6 direction (FIG. 5) about the rotation shaft 848C, contrary to the above. At this time, the moving projection 825 is guided by the track hole 865D, the first moving plate 82 moves in the + Y axis direction (upward), and the projection position is adjusted in the + Y axis direction (upward).

  FIG. 6 is a diagram illustrating the structure of the second adjustment driving unit 87. Specifically, FIG. 6 is a view of the state in which the second adjustment driving unit 87 is disposed on the auxiliary plate 84 as viewed from the −Z-axis direction. In FIG. 6, as in FIGS. 3 and 4, the projection direction from the projection lens 10 is the Z axis, and two axes orthogonal to the Z axis are the X axis (horizontal axis) and the Y axis (vertical axis). To do.

  The second adjustment drive unit 87 moves the second moving plate 83 in the X-axis direction by the user's operation, and the first moving plate 82 is interlocked with the movement of the second moving plate 83, This is a part for changing the projection position of the projection lens 10 in the X-axis direction. The second adjustment drive unit 87 includes a dial 861 (including a hole on the back surface), a dial gear 862 (including a shaft portion 862A, a gear 862B, and a circular hole 862B1), and a second intermediate portion of the first adjustment drive unit 87. Dial 871 similar to gear 864 (including first gear 864A, second gear 864B, and circular hole 864C), drive gear 865 (including gear body 865A, meshing portion 865B, circular hole 865C, and track hole 865D) (Including holes on the back surface), dial gear 872 (including shaft portion 872A, gear 872B, and circular hole 872B1), intermediate gear 873 (including first gear 873A, second gear 873B, and circular hole 873C), drive A gear 874 (including a gear main body 874A, a meshing portion 874B, a circular hole 874C, and a track hole 874D) is provided.

The dial 871 is an operation unit that is partly exposed from the upper surface of the upper case 21 in the outer casing 2 and operated by the user, and is arranged on the + Z axis direction side of the auxiliary plate 84 as shown in FIG. And disposed in the recess 843 of the auxiliary plate 84.
As shown in FIG. 4, the dial gear 872 is disposed on the −Z axis direction side of the auxiliary plate 84. In the dial gear 872, the shaft portion 872 </ b> A is inserted into the insertion hole 844 </ b> A of the auxiliary plate 84 as shown in FIG. 4 in a state where the projection position adjusting device 8 is assembled. The dial 871 is pivotally supported by the auxiliary plate 84 by screwing the screw hole of the shaft portion 872 </ b> A and the hole on the back surface of the dial 871.
As shown in FIG. 6, the intermediate gear 873 is disposed on the −Z axis direction side of the auxiliary plate 84. The intermediate gear 873 is inserted in the circular hole 873C through the rotation shaft 845A of the auxiliary plate 84 in the state where the projection position adjusting device 8 is assembled, and the intermediate gear 873 is connected to the rotation shaft 845A. It is pivotally supported by the shaft.

  As shown in FIG. 4, the drive gear 874 is disposed on the −Z axis direction side of the auxiliary plate 84. As shown in FIG. 6, in the state where the projection position adjusting device 8 is assembled, the drive gear 874 is inserted into the circular hole 874C with the rotation shaft 845B of the auxiliary plate 84, and the drive gear 874 is rotated with the rotation shaft 845B. It is pivotally supported by the shaft. In the drive gear 874, the moving projection 833 of the second moving plate 83 is inserted into the track hole 874 </ b> D in a state where the projection position adjusting device 8 is assembled.

With the above configuration, when the user rotates the dial 871 in the X1 direction (FIG. 6), the rotation of the dial 871 is transmitted to the drive gear 874 by the dial gear 872 and the intermediate gear 873, and the drive gear 874 is It rotates in the X6 direction (FIG. 6) about the rotation shaft 845B. At this time, the moving projection 833 is guided by the track hole 874D, and the second moving plate 83 moves in the −X axis direction. Here, the first moving plate 82 moves in the −X-axis direction together with the second moving plate 83 by the sliding protrusion 830 of the second moving plate 83 and the rail groove 824 of the first moving plate 82. Then, together with the first moving plate 82, the projection lens 10 moves in the −X axis direction, and the projection position is adjusted in the −X axis direction.
Further, when the user rotates the dial 871 in the X2 direction (FIG. 6), the drive gear 874 rotates in the X5 direction (FIG. 6) about the rotation shaft 845B, contrary to the above. At this time, the moving projection 833 is guided by the track hole 874D, the second moving plate 83 and the first moving plate 82 move in the + X-axis direction, and the projection position is adjusted in the + X-axis direction.

As shown in FIGS. 3 and 4, the shift cover 89 is disposed on the + Y axis direction end side (upper end side) of the projection position adjusting device 8 and on the + Y axis direction side (upper side) of the projection lens 10. Yes.
The shift cover 89 is a portion fixed to the fixed plate 81 and the auxiliary plate 84, and is configured from a plate body that is rectangular in plan view.

As shown in FIG. 4, the shift cover 89 has four fixing holes 89A corresponding to the two screw holes 816 of the fixing plate 81 and the two screw holes 846B of the auxiliary plate 84. . Further, three positioning holes 89B are formed corresponding to the positioning protrusions 817 of the fixed plate 81 and the two positioning protrusions 846A of the auxiliary plate 84.
Then, by inserting the positioning protrusions 817 and 846A into the three positioning holes 89B, the shift cover 89 is positioned with respect to the members 81 to 84, and screws (not shown) are inserted through the four fixing holes 89A. ) Is screwed into the screw holes 816 and 846B of the fixing plate 81 and the auxiliary plate 84, so that the shift cover 89 is fixed to the members 81 to 84.
Further, as shown in FIG. 4, the shift cover 89 has an opening 89 </ b> C corresponding to the dial 871 of the second adjustment drive unit 87. That is, in a state where the shift cover 89 is fixed to the members 81 to 84, a part of the dial 871 is exposed through the opening 89C.

As shown in FIG. 4, the urging member 88 includes four first urging members 88A disposed between the first moving plate 82 and the second moving plate 83, the second moving plate 83, and the shift. The second biasing member 88B is disposed between the covers 89.
The four first urging members 88A include a stopper 88A1 and a spring 88A2. Then, as shown in FIG. 4, springs 88A2 are inserted into the four biasing holes 823 of the first moving plate 82 from the + Z-axis direction, respectively, and the stoppers 88A1 are inserted via the inserted springs 88A2. Is fitted. For this reason, urging in the Z-axis direction acts on the stopper 88A1.
Therefore, in a state where the projection position adjusting device 8 is assembled, these first urging members 88A urge the first moving plate 82 against the fixed plate 81 and the second moving plate 83 as the auxiliary plate 84. Energize against.

  Thereby, in the state where the projection position adjusting device 8 is assembled, the second moving plate 83 can be urged against the first moving plate 82 and the auxiliary plate 84. For this reason, a gap generated due to manufacturing tolerances or the like can be filled with the first urging member 88A between the second moving plate 83, the first moving plate 82, and the auxiliary plate 84. When moving in the X-axis direction, the second moving plate 83 does not rattle, and the second moving plate 83 can be moved well. In addition, by interposing the first urging member 88A as described above, the first moving plate 82 is also urged against the fixed plate 81, and the first moving plate with respect to the fixed plate 81. 82 can also be moved well. Accordingly, the projection position can be adjusted with higher accuracy without causing the projection position to wave when the moving plates 82 and 83 are moved to adjust the projection position.

  As shown in FIG. 4, the second urging member 88B is a molded product having a cylindrical shape formed by molding a resin material. The second urging member 88B is disposed in the concave portion 835 of the second moving plate 83 so that the cylindrical axis direction faces the Z-axis direction. In the assembled state of the projection position adjusting device 8, the second urging member 88 </ b> B urges the second moving plate 83 against the auxiliary plate 84 in the −Y axis direction (downward). That is, the engagement protrusion 834 of the second moving plate 83 is biased in the −Y axis direction (downward) with respect to the engagement recess 840 of the auxiliary plate 84.

  Accordingly, a gap generated due to manufacturing tolerance or the like can be filled between the second moving plate 83 and the auxiliary plate 84 by the second urging member 88B, and the second moving plate 83 is moved in the X-axis direction. In addition, the second moving plate 83 is not rattled, and the second moving plate 83 can be moved well. Therefore, when the second moving plate 83 is moved in the X-axis direction and the projection position is adjusted in the X-axis direction, the projection position can be adjusted with higher accuracy without undulating the projection position.

[5. Configuration of Projection Lens 10]
7 and 8 are a perspective view and a cross-sectional perspective view showing the structure of the projection lens 10, respectively. 7 and 8, as in FIGS. 3 and 4, the projection direction from the projection lens 10 is the Z axis, and two axes orthogonal to the Z axis are the X axis (horizontal axis) and the Y axis (vertical). Axis).
The projection lens 10 includes three lens groups, a cylindrical lens barrel 11 that supports the projection lens 10 as a whole and is fixed inside the projector 1, and a first focus adjustment for a projected image that is enlarged and projected on the screen. The projection adjustment unit 12 includes a focus adjustment unit 12 as an image adjustment unit and a zoom adjustment unit 13 as a second image adjustment unit for performing zoom adjustment of the projection image, and is configured as a projection lens 10 having a so-called focus function and zoom function. ing.
The three lens groups include a fixed lens 143 as a fixed lens group, a plurality of zoom lenses 142 as a zoom lens group, and a focus lens 141 as a focus lens group. It arranges in order toward the tip side.

As shown in FIG. 8, the outer periphery of the lens barrel 11 is inserted into a flange portion 112 fixed to the projection position adjusting device 8 and an engagement member 134 </ b> C described later from the −Z-axis direction end toward the + Z-axis direction. The elongated holes 113, the first abutting portions A114 that abut on the first frame 122 described later, the threaded portions A115 that engage with the first frame 122, and the second abutting portions A116 are spaced at predetermined intervals, respectively. It is formed with.
The long hole 113 is formed in a range of a predetermined length on the outer periphery of the lens barrel 11 orthogonal to the longitudinal direction of the lens barrel 11. The first contact portion A114 and the screwing portion A115 are each formed in a cylindrical shape having an outer diameter dimension larger than the outer diameter dimension of the proximal end portion of the lens barrel 11. In addition, the external thread is formed in the outer periphery of the screwing part A115.

The focus adjustment unit 12 is disposed at the front end portion of the lens barrel 11 in the projection direction, supports the focus lens 141 and is movable in the projection direction with respect to the lens barrel 11, and the + Z axis direction of the projection lens 10. And a focus adjustment ring 123 having a circular frame shape when viewed from above. The focus adjustment unit 12 moves the focus lens 141 in the projection direction via the first frame body 122 to adjust the focus of the projection image.
The first frame 122 has a cylindrical shape and a helicoid frame 122A that is screwed with the screwing portion A115 of the lens barrel 11, and is fitted to the inner diameter portion of the end portion in the + Z-axis direction of the helicoid frame 122A. And a lens support frame 122B for supporting the lens. The focus adjustment ring 123 is fixed to the front end of the lens support frame 122B in the projection direction.
The helicoid frame 122A includes a threaded portion B122A1 that is threadedly engaged with the threaded portion A115 of the lens barrel 11, a first extending portion 122A2 that extends to the −Z axial direction side from the threaded portion B122A1, and a first extending portion. A first abutting portion B122A3 provided at an end of the protruding portion 122A2 and abutting on the outer peripheral surface of the first abutting portion A114 of the lens barrel 11; On the other hand, the helicoid frame 122A has a second contact portion B122A4 that is provided on the + Z axis direction side with respect to the threaded portion B122A1 and contacts the outer peripheral surface of the second contact portion A116 of the lens barrel 11. The second contact portion B122A4 is formed in a state of being depressed over the entire circumference toward the central axis rather than the threaded portion B122A1.

  A female screw (not shown) is formed on the inner diameter portion of the threaded portion B122A1. This female screw is screwed with the male screw of the screwing portion A115 of the lens barrel 11, and when the user operates the focus adjustment ring 123 to rotate around the axis of the circular frame, the helicoid frame 122A is rotated around the frame center axis. The helicoid frame 122A moves in the Z-axis direction with respect to the lens barrel 11. Further, in the movement range of the helicoid frame 122A in the + Z-axis direction, the first contact portion B122A3 and the second contact portion B122A4 are in contact with the first contact portion A114 and the second contact portion A116 of the lens barrel 11, respectively. The state is configured to be maintained. Thereby, the position of the focus lens 141 is changed and the focus adjustment of the projection image is performed.

The zoom adjustment unit 13 includes a cam coupling part 132 that is disposed inside the lens barrel 11 and supports a plurality of zoom lenses 142 on the inner diameter part, and an operation part 134 that operates the cam coupling part 132. Then, the zoom lens 142 is moved in the projection direction to adjust the magnification of the projected image.
The cam connecting portion 132 is cylindrical and is supported by the cam mechanism so as to be movable in the Z-axis direction with respect to the lens barrel 11. A spiral groove 132 </ b> A is formed on the outer periphery of the cam connecting portion 132.
The operation part 134 is provided on the outer periphery of the first extension part 122A2 of the first frame body 122 and extends from the projection direction front end side to the base end side of the projection lens 10, and the zoom auxiliary ring 134B. The zoom adjustment ring 134A fixed to the end portion in the + Z-axis direction of 134B, and the engaging member 134C fixed to the end portion in the −Z-axis direction of the zoom auxiliary ring 134B and engaged with the spiral groove 132A of the cam connecting portion 132. And.

The zoom adjustment ring 134 </ b> A has a cylindrical frame shape and has a larger diameter than the lens barrel 11 of the projection lens 10 as shown in FIG. 7. The zoom adjustment ring 134 </ b> A is disposed on the −Z-axis direction side with respect to the focus adjustment ring 123, and is disposed so as to be exposed to the outside through the opening 231 of the front case 23 together with the focus adjustment ring 123.
Two flange-shaped overhang portions 134B1 are formed on the outer periphery of the zoom assist ring 134B. An engagement groove 134B2 is formed by these overhang portions 134B1.

  The engaging member 134C is formed so as to pass through the long hole 113 of the lens barrel 11 and protrude from the zoom auxiliary ring 134B toward the inside of the lens barrel 11, and has one end fixed to the zoom auxiliary ring 134B. 11 is engaged with the spiral groove 132A of the cam connecting portion 132. As described above, the operating member 134 is rotated about the central axis by the engaging member 134C of the operating portion 134, the elongated hole 113 of the lens barrel 11, and the spiral groove 132A of the cam connecting portion 132, so that the cam connecting portion 132 is pivoted. It is configured to move in the direction.

In such a configuration, when the zoom adjustment ring 134A is rotated about the cylindrical axis, the engaging member 134C is inserted into the elongated hole 113 of the lens barrel 11 via the connected zoom auxiliary ring 134B. It moves in the outer peripheral direction of the lens barrel 11. Then, since the tip of the engaging member 134C moves in a state of being engaged with the spiral groove 132A of the cam connecting portion 132, the cam connecting portion 132 moves in the Z-axis direction. In this way, the zoom lens 142 is moved by the inner cam mechanism to adjust the magnification of the projected image.
Further, when the focus adjustment ring 123 is rotated about the cylindrical axis, the helicoid frame 122A is rotated via the lens support frame 122B to be connected and moved in the Z-axis direction. Then, the focus lens 141 is moved, and the focus adjustment of the projection image is performed.

At this time, in the movement range of the helicoid frame 122A in the + Z-axis direction, the first contact portion B122A3 and the second contact portion B122A4 are respectively in contact with the first contact portion A114 and the second contact portion A116 of the lens barrel 11. Since the contact state is maintained, positioning of the focus lens 141 fixed to the helicoid frame 122A via the lens support frame 122B is performed by the screwing part B122A1 and the first contact part B122A3 or the screwing part. This is implemented by B122A1 and the second contact portion B122A4.
Accordingly, the tilt due to the gap of the screwing portion B122A1 and the tilt due to the processing error of the screwing portion B122A1 are suppressed, and the tilt accuracy of the focus lens 141 is improved, so that the lens performance of the projection lens 10 is improved. For example, it is possible to suppress the occurrence of a phenomenon (single blurring phenomenon) in which only an end portion in one direction of a projected image is not focused.

Further, in the operation unit 134 of the zoom adjustment unit 13, the zoom auxiliary ring 134 </ b> B is provided on the outer periphery of the first extension portion 122 </ b> A <b> 2 of the first frame body 122, so that the zoom adjustment ring 134 </ b> A is positioned at the + Z axial direction end of the projection lens 10. Since the focus adjustment ring 123 and the zoom adjustment ring 134A can be disposed in a state exposed to the outside from the opening 231 of the front case 23, good operability by the user can be maintained.
Even if the portion for operating the cam coupling portion 132 together with the projection lens 10 is moved by the projection position adjusting device 8, the cam coupling portion 132 is moved by the zoom adjustment ring 134 </ b> A at the front end in the projection direction of the projection lens 10 by the zoom auxiliary ring 134 </ b> B. Since it can be operated, the operability of the projection lens 10 can be maintained without being deteriorated.

Next, the operation of the projection lens 10 when an impact is applied to the projector 1 (FIG. 1) due to dropping will be described.
The projection lens 10 is housed in the exterior housing 2 with the flange 112 fixed to the projection position adjusting device 8, and the focus adjustment unit 12 and the zoom adjustment unit are located on the + Z axis direction side of the flange 112. 13 and has a center of gravity position on the tip side in the + Z-axis direction. For this reason, when the projector is dropped, the projection lens 10 is tilted and dropped toward the center of gravity. Since the impact is applied when the projection lens 10 is tilted in the Y-axis direction, the first and second adjustment driving units 86 and 87 of the projection position adjusting device 8 are compared with the case where the projection lens 10 is dropped without tilting. It is possible to reduce the influence of the impact at the time of dropping. Accordingly, it is possible to prevent damage to the internal mechanism of the projection position adjusting device 8 when dropped.

[6. Modification of the above embodiment]
The best configuration for implementing the present invention has been disclosed in the above description, but the present invention is not limited to this. That is, since the embodiment does not limit the present invention, description of the names of members excluding some or all of the limitations on the shape, material, etc. is included in the present invention. is there.
For example, in the above-described embodiment, the focusing lens group among the plurality of lens groups is configured by a single lens, but the number of lenses is not limited and may be configured by a plurality of lenses. In addition, the zoom lens group among the plurality of lens groups includes three lenses, but the number of lenses is not limited, and may be one, two, or four or more.

In the above-described embodiment, the configuration in which the optical unit 4 has a substantially L shape in plan view has been described. However, the configuration is not limited thereto, and for example, a configuration having a substantially U shape in plan view may be employed.
In the above-described embodiment, only the example of the projector 1 using the three liquid crystal panels 441 has been described. However, the present invention is a projector using only one liquid crystal panel, a projector using only two liquid crystal panels, or 4 The present invention can also be applied to a projector using two or more liquid crystal panels.

In the embodiment, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In the embodiment, the liquid crystal panel is used as the light modulation device. However, a light modulation device other than liquid crystal, such as a device using a micromirror, may be used. In this case, polarizing plates on the light beam incident side and the light beam emission side can be omitted.
In the above embodiment, only an example of a front type projector that performs projection from the direction of observing the screen has been described, but the present invention is also applicable to a rear type projector that performs projection from the side opposite to the direction of observing the screen. Is possible.

  The present invention can be used for a projector.

FIG. 2 is a perspective view illustrating an appearance of a projector according to the present embodiment. The top view which shows typically the optical system of the image projection apparatus in the said embodiment. The perspective view which looked at the projection position adjustment apparatus in the said embodiment from the projection direction front side. The disassembled perspective view of the projection position adjusting device in the embodiment. The figure which shows the structure of the 1st adjustment drive part in the said embodiment. The figure which shows the structure of the 2nd adjustment drive part in the said embodiment. The perspective view which shows the structure of the projection optical apparatus in the said embodiment. FIG. 3 is a cross-sectional perspective view showing the configuration of the projection optical apparatus in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector, 8 ... Projection position adjustment apparatus, 10 ... Projection lens (projection optical apparatus), 11 ... Lens tube, 12 ... Focus adjustment part (1st image adjustment part), 122 ... 1st frame, 122A1 ... Screwing Part B, 122A2 ... first extension part, 13 ... zoom adjustment part (second image adjustment part), 132 ... cam coupling part, 134B ... zoom auxiliary ring, 141 ... focus lens (focusing lens group), 142 ... zoom Lens (zoom lens group), 411... Light source device, 441... Liquid crystal panel (light modulation device).

Claims (2)

A projector comprising: a light source device; a light modulation device that modulates a light beam emitted from the light source device according to image information to form an optical image; and a projection optical device that magnifies and projects the optical image on a screen. And
The projection optical device includes:
A plurality of lens groups;
A lens barrel that supports the entire projection optical device and is fixed inside the projector;
A first frame that is disposed at a front end portion of the lens barrel in the projection direction and supports a focusing lens group among the plurality of lens groups and is movable in the projection direction with respect to the lens barrel, and is enlarged on the screen A first image adjustment unit that performs focus adjustment of the projected image,
A cam connecting portion that is arranged inside the lens barrel and supports a zoom lens group among the plurality of lens groups and is movable in the projection direction with respect to the lens barrel by a cam mechanism, and arranged on the outer peripheral side of the lens barrel A zoom auxiliary ring that is connected to the cam connecting portion via the lens barrel and moves the cam connecting portion by the cam mechanism, and a second image adjusting portion for performing zoom adjustment of the projected image; Prepared,
The first frame is
A threaded portion that is threadedly engaged with the outer periphery of the projection direction tip of the lens barrel;
A first extending portion that extends from the threaded portion toward the proximal end side in the projection direction of the lens barrel, and has a contact portion that contacts the outer periphery of the lens barrel at the distal end portion in the extending direction;
The zoom assist ring is
Arranged on the outer peripheral side of the first frame body, extending from the projection direction front end side to the base end side of the projection optical device, and connected to the cam coupling portion via the lens barrel at the extension direction front end portion A projector characterized by that. The projector according to claim 1,
A projector comprising: a projection position adjusting device configured to adjust the projection position of the projection optical device by moving the projection optical device within a plane orthogonal to the projection direction.

Images