JP2006301424A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector whose manufacturing processes can be simplified and both of the maintenance of projection performance and the adjustment of a projecting position can be attained. <P>SOLUTION: The projector is provided with: an optical device 45 for forming an optical image by modulating a light flux from a light source; a projecting optical device 46 for enlarging and projecting the optical image; a projecting position adjusting device 5 for moving the projecting optical device 46 in a face approximately orthogonal to a projecting direction to move the projecting position of a light flux emitted from the projecting optical device 46; and a support 48 for supporting the projecting position adjusting device 5. The support 48 is provided with a horizontal part 481 for fixing the optical device 45 and a vertical part 482 approximately orthogonal to the horizontal part 481. The projecting position adjusting device 5 is provided with a moving member 51 connected to the projecting optical device 46 and allowed to move along a face 482A approximately parallel with the vertical part 482 to move the projecting optical device 46 in the face approximately orthogonal to the projecting direction and a depression member 52 for biasing at least either one of the moving member 51 and the projecting optical device 46 to the face 482A of the vertical part 482 to support it. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector including a projection position adjusting device that moves a projection position of a light beam emitted from a projection optical device.

  2. Description of the Related Art Conventionally, projectors are frequently used for presentations at conferences, academic conferences, exhibitions, etc., and home theaters. As such a projector, a light source, a plurality of light modulation devices that modulate the light beam emitted from the light source according to image information, and an optical image formed by combining the light beams emitted from the plurality of light modulation devices An optical device having a color synthesizing optical device and a projection optical device that enlarges and projects an optical image formed by the optical device onto a screen or the like is known.

Such a projector needs to adjust the position of the projected image when projecting the formed optical image on the screen. For such a need, a projection lens shift mechanism is known as a projection position adjusting device that moves the projection optical device in a direction substantially orthogonal to the projection direction of the projection optical device (for example, Patent Document 1). reference).
The projection lens shift mechanism described in Patent Document 1 includes a base plate attached to the projector device, a movable plate that moves (shifts) the projection lens along the base plate, and presses and holds the movable plate and the projection lens against the base plate. And a holding plate. Then, by moving the movable plate relative to the base plate, the projection lens can be moved in a direction substantially orthogonal to the projection direction of the projection lens. Therefore, the projection position of the optical image emitted from the projection lens with respect to the screen can be adjusted by attaching such a projection lens shift mechanism to the projector apparatus and moving the movable plate.

  By the way, when the position of the light modulation device is adjusted at the stage of manufacturing the projector, in order to satisfy the projection performance of the projection lens, the error in the distance between the light modulation device and the projection lens is a slight tolerance range defined by the design. It needs to be within. For this reason, for example, the following two methods can be used to adjust the position of the light modulation device in the manufacturing stage.

  The first method is to adjust the position of the color synthesizing optical device on the horizontal portion of the head body in the projector device, and then fix the color synthesizing optical device to the surface on the light emission side of the vertical portion of the base plate. A dummy for the lens shift mechanism is arranged. Thereafter, the position of the light modulation device is adjusted with respect to the projection lens and fixed to the color synthesis optical device. The projection lens shift mechanism dummy used here is not incorporated as a product, but is a projection lens shift mechanism almost as designed. According to such a method, it is possible to simplify the manufacturing process of the projector having the optical device and the projection lens shift mechanism having the same design. Therefore, it is preferable that this method is adopted in the manufacture of the projector.

  However, there may be a manufacturing error in each part of the projection lens shift mechanism that is mass-produced and incorporated in the manufacturing stage, and the manufacturing error is accumulated and increased when the number of parts of the projection lens shift mechanism is large. For this reason, in the first method described above, an error occurs between the light modulation device whose position is adjusted by the dummy of the projection lens shift mechanism and the projection lens shift mechanism incorporated as a product, and the back focus position of the projection lens is set. The light modulation device may not be located. In such a case, there exists a problem that the projection performance of a projection lens falls.

  On the other hand, in the second method, the position of the light modulation device is adjusted using a projection lens and a projection lens shift mechanism that are actually incorporated in the product stage. According to this method, since the position adjustment is performed using the projection lens shift mechanism and the light modulation device respectively incorporated, these position adjustments can be performed accurately.

JP 2002-365725 A

However, in the above-described second method, after the actual projection lens shift mechanism including the projection lens is assembled, it is necessary to adjust the position of the light modulation device for each projection lens shift mechanism. There is a problem that it becomes complicated.
Further, when the projection lens shift mechanism described in Patent Document 1 is adopted as the projection lens shift mechanism, the base plate, the movable plate, the non-uniform thickness of the vertical portion of the head body in the projector device, the warpage of the component, and the like As a result, when the projection lens is moved (shifted), there may be a deviation in the distance between the projection lens and the light modulation device. In such a case, the parallelism of the projection lens cannot be maintained, and the light modulation device may not be located at the back focus position of the projection lens, causing one-sided blur of the projected image or tracking during zooming. There is a problem that the projection performance deteriorates, such as a decrease in performance.

  The objective of this invention is providing the projector which can simplify a manufacturing process and can make a projection performance maintenance and adjustment of a projection position compatible.

  In order to achieve the above-described object, a projector according to the present invention combines a plurality of light modulation devices that modulate a light beam emitted from a light source according to image information and a light beam emitted from the plurality of light modulation devices. An optical device having a color combining optical device for forming an optical image, a projection optical device for enlarging and projecting the optical image, and the projection optical device by moving the projection optical device in a plane substantially orthogonal to the projection direction. A projection position adjusting device that moves a projection position of a light beam emitted from the projector and a support that supports the projection position adjusting device, wherein the support includes a horizontal portion that fixes the optical device; The projection position adjusting device is connected to the projection optical device and moves along a plane substantially parallel to the vertical portion of the support, and the projection optical device. The throw A moving member that moves in a plane substantially perpendicular to the direction; and a pressing member that biases and supports at least one of the moving member and the projection optical device with respect to the surface of the vertical portion. To do.

Here, examples of the light modulation device include a liquid crystal panel having a pair of opposing substrates and a liquid crystal element that is hermetically sealed between the substrates and modulates incident light flux.
In addition, as the color combining optical device, for example, a plurality of light flux incident surfaces that are configured by a plurality of prisms each having a dielectric multilayer film formed at each interface and on which the light beams emitted from the plurality of light modulation devices are incident. And a dichroic prism having a light exit surface from which the combined incident light flux is emitted.

According to the present invention, the projection position adjusting device of the projector is attached to the vertical portion of the support that fixes the optical device to the horizontal portion. The projection position adjusting device is connected to the projection optical device, and moves along a plane parallel to the vertical portion of the support, thereby moving the projection optical device in a plane substantially orthogonal to the projection direction; And a pressing member that biases and supports at least one of the moving member and the projection optical device on the surface of the vertical portion.
According to this, for example, a member corresponding to the base plate of the projection lens shift mechanism described in Patent Document 1 can be omitted, and the distance between the light incident surface of the projection optical apparatus and the image forming area of the light modulation apparatus can be reduced. The number of affected parts can be reduced. For this reason, it is possible to reduce errors such as thickness dimensions accumulated with an increase in the number of parts. Accordingly, it is possible to suppress the one-side blur and the tracking performance when the projection optical apparatus is moved, and it is possible to suppress the deterioration of the projection performance.

  Further, by reducing the number of components that affect the distance between the projection optical device and the light modulation device, it is possible to reduce manufacturing errors in the thickness dimension of the projection position adjusting device. According to this, since the error with the above-mentioned dummy can be reduced, it is possible to adjust the position of the light modulation device by adopting the above-described first method, and to simplify the manufacturing process of the projector. be able to.

In the present invention, the projection optical device includes a lens barrel and a flange portion protruding from the outer peripheral surface of the lens barrel, and abuts against the vertical portion on a light beam incident side surface or a light beam emission side surface of the flange portion. It is preferable that a contact surface is provided.
According to the present invention, the contact surface of the flange portion provided in the lens barrel of the projection optical apparatus moves along the surface of the vertical portion of the support. According to this, it can suppress that the thickness dimension of the moving member which moves a projection optical apparatus influences the distance of a projection optical apparatus and an optical apparatus. Accordingly, it is possible to further reduce the number of parts that affect the distance between the projection optical apparatus and the optical apparatus, and it is possible to further suppress a decrease in projection performance.

In the present invention, it is preferable that the moving member and the flange portion are integrally formed.
According to the present invention, since the moving member is formed integrally with the flange portion provided in the lens barrel of the projection optical device, the flange portion also serves as the moving member, and the projection optical device itself is the support. It moves along the surface of the vertical part.
According to this, the component that affects the distance between the projection optical device and the light modulation device becomes the vertical portion of the support and the flange portion of the projection optical device, and the number of components that affect the distance can be reduced. it can. Moreover, since the moving member and the flange portion are integrally formed, the number of parts of the projection position adjusting device itself can be reduced.
Therefore, the configuration of the projector can be simplified, the number of parts that affect the distance between the projection optical apparatus and the optical apparatus can be reduced, and deterioration of the projection performance due to the movement of the projection optical apparatus can be further suppressed. can do.

In the present invention, it is preferable that the horizontal portion and the vertical portion are integrally formed.
According to the present invention, since the horizontal portion and the vertical portion are integrated, the orthogonality between the horizontal portion and the vertical portion can be accurately compared with the case where the independent horizontal portion and the vertical portion are fixed with screws or the like. Can keep. Therefore, since the orthogonality between the optical device fixed to the horizontal portion and the projection optical device moving along the surface of the vertical portion can be accurately maintained, the projection position is adjusted by moving the projection optical device. In addition, one-sided blur and a decrease in tracking performance can be suppressed, and a decrease in projection performance accompanying movement of the projection optical apparatus can be suppressed.
In addition, the number of components that affect the distance between the projection lens and the light modulation device can be reduced as compared with the case where the projection lens shift mechanism described in Patent Document 1 is employed. Therefore, it is possible to configure a projector that can suppress a reduction in projection performance due to a manufacturing error in the accumulated thickness of parts and can simplify the manufacturing process.

In the projector according to the aspect of the invention, a plurality of optical components that optically convert a light beam incident from the light source, and an illumination optical axis of the light beam emitted from the light source are set therein, and the plurality of optical components are accommodated in the illumination. It is preferable that the optical component housing be disposed at a predetermined position on the optical axis, and the support and the optical component housing are integrally formed.
According to the present invention, since the support body that supports the optical device and the projection optical device is formed integrally with the optical component casing, the number of components that constitute the projector can be reduced. Further, since it is not necessary to incorporate the support body into the optical component casing, the manufacturing process can be further simplified. Therefore, it is possible to simplify the configuration of the projector and to simplify the manufacture of the projector.

[1. First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
(1) Configuration of Projector 1 FIG. 1 is a schematic perspective view showing a projector 1 according to this embodiment.
The projector 1 modulates the light beam emitted from the light source according to the image information, and enlarges and projects it on a projection surface such as a screen. The projector 1 controls the driving of the optical unit 4 that forms an optical image corresponding to the input image information, and the liquid crystal panel 451 that forms the optical unit 4 by processing the image information, and also controls the entire apparatus. A substrate (not shown), a power supply unit (not shown) for supplying driving power to the entire apparatus, and an exterior case 2 for storing these inside are provided.

As shown in FIG. 1, the exterior case 2 is a synthetic resin casing having a substantially rectangular parallelepiped shape as a whole, and a projection lens 46 as a projection optical device constituting the optical unit 4 is exposed from the front surface portion.
The projection lens 46 enlarges and projects an optical image modulated and formed by a liquid crystal panel 451 (see FIG. 2) as a light modulation device to be described later, and is a combined lens in which a plurality of lenses are housed in a lens barrel 461. It is configured.

The outer case 2 includes an upper case that covers the upper surface portion of the apparatus main body, a lower case that covers the lower surface portion of the apparatus main body, a front case that covers the front surface portion of the apparatus main body, and a side case that covers a part of the side surface portion of the apparatus main body. And a rear case covering the back portion of the apparatus main body, and these are coupled to each other.
In addition, the upper surface portion 21, the front surface portion 22, the side surface portion 23 (left side when the projector 1 is viewed from the rear), 24 (right side when the projector 1 is viewed from the rear), the bottom surface portion 25, and the rear surface portion. Corner portions (not shown) are formed in a curved surface.

An operation panel 211 that performs a startup / adjustment operation of the projector 1 is provided at a substantially central portion on the back side of the upper surface portion 21 so as to extend in the left-right direction. When the operation button 212 disposed on the operation panel 211 is appropriately pressed, a tact switch mounted on a circuit board (not shown) disposed inside the operation panel 211 is brought into contact, and a desired operation can be performed. In addition, an LED (not shown) is attached to the circuit board so that it emits light according to a desired operation.
Further, the operation panel 211 includes a decorative plate 213 disposed so as to surround the operation button 212, and light from the LED is diffused through the decorative plate 213.

  Further, a dial 55 constituting the projection position adjusting device 5 (see FIGS. 2 and 3) that adjusts the projection position by the projection lens 46 by moving the projection lens 46 up and down is exposed on the front side of the upper surface portion 21. is doing. When the dial 55 is moved in the X1 direction (rightward when viewed from the rear of the projector 1), the projection lens 46 is moved in the Y1 direction (upward), and when the dial is moved in the X2 direction (leftward as viewed from the rear of the projector 1), the projection lens is moved. 46 moves in the Y2 direction (downward). Thereby, the projection position of the optical image by the projection lens 46 can be adjusted.

As described above, the opening 221 for exposing the projection lens 46 is formed on the right side in FIG.
A remote control light receiving window 222 is formed at a substantially central portion of the front surface portion 22. A remote control light receiving module 223 that receives an operation signal from a remote controller (not shown) is disposed inside the remote control light receiving window 222.
The remote controller is provided with the same buttons as the various operation buttons 212 provided on the operation panel 211 described above. When the remote controller is operated, an infrared signal corresponding to the operation is output from the remote controller. The signal is received by the light receiving unit of the remote control light receiving module 223 and processed by the control board.

1 is formed with a notch 24A in which a louver 241 composed of a plurality of blades 2411 is exposed. Inside the louver 241, a fan (not shown) that exhausts the air that has cooled each device in the exterior case 2 is provided.
Further, a lamp replacement port 24B for replacing a light source device 41 of the optical unit 4 described later is formed on the back side of the notch 24A, and a lamp cover 24C covering the lamp replacement port 24B is detachably provided. Yes.

A fixed leg portion (not shown) is provided at the center of the back surface side of the bottom surface portion 25, and adjustment leg portions 251 are provided at both ends of the front side in the long side direction.
The adjustment leg portion 251 includes a shaft-like member (not shown) that protrudes from the bottom surface portion 25 so as to be able to advance and retract in the out-of-plane direction, and adjusts the vertical and horizontal tilt positions of the projector 1 when the projector 1 projects. It is possible.

Although not shown in detail on the back surface, an inlet connector for supplying power from an external power source to the projector 1 and various input / output terminals for inputting image signals, audio signals, and the like from external devices are exposed. is doing. These input / output terminals are connected to an interface board provided in the exterior case 2.
The interface board is electrically connected to a control board (not shown), and a signal processed by the interface board is output to the control board and processed.

(2) Configuration of Optical Unit 4 FIG. 2 is a schematic diagram illustrating an optical system of the optical unit 4.
As described above, the optical unit 4 modulates the light beam emitted from the light source according to image information to form an optical image, and enlarges and projects the formed optical image.
As shown in FIG. 2, the optical unit 4 includes a light source device 41, an integrator illumination optical system 42, a color separation optical system 43, a relay optical system 44, an optical device 45, and optical components that house these components. Housing 47, projection lens 46, head body 48 as a support, and projection position adjusting device 5 that moves projection lens 46 to move the optical image projection position by projection lens 46. ing.

  The light source device 41 includes a light source lamp 411 as a radiation light source, a reflector 412, an explosion-proof glass 413, and a light source lamp box 414 that is a casing made of a synthetic resin that houses them. Then, the light source device 41 reflects the radial light beam emitted from the light source lamp 411 by the reflector 412 into a parallel light beam, and emits the parallel light beam to the outside through the explosion-proof glass 413.

Among these, as the light source lamp 411, a high-pressure mercury lamp is employed in the present embodiment, but a metal halide lamp, a halogen lamp, or the like can also be employed. Moreover, although the parabolic mirror is employ | adopted as the reflector 412, you may employ | adopt what combined the parallelizing concave lens and the ellipsoidal mirror instead of the parabolic mirror.
The explosion-proof glass 413 is a translucent glass member that closes the opening of the reflector 412 so that when the light source lamp 411 is ruptured, the fragments of the light source lamp 411 are not scattered from the light source lamp box 414 to the outside. It is configured.
The light source lamp box 414 is formed with a pair of handles (not shown) so that the light source lamp box 414 can be easily gripped when the light source device 41 is replaced. When it is necessary to replace the light source device 41 due to the life or damage of the light source lamp 411, the lamp cover 24C (FIG. 1) is removed and the light source device 41 is removed from the lamp replacement port 24B (FIG. 1). Each can be exchanged.

The integrator illumination optical system 42 is an optical system for substantially uniformly illuminating image forming areas of three liquid crystal panels 451 described later of the optical device 45.
As shown in FIG. 2, the integrator illumination optical system 42 includes a first lens array 421, a second lens array 422, a polarization conversion element 423, and a superimposing lens 424.

The first lens array 421 has a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis direction are arranged in a matrix, and each small lens receives a plurality of light beams emitted from the light source device 41. Divide into partial beams.
The second lens array 422 has a configuration similar to that of the first lens array 421, and has a configuration in which small lenses are arranged in a matrix. The second lens array 422 has a function of forming an image of each small lens of the first lens array 421 together with the superimposing lens 424 on a liquid crystal panel 451 described later.

The polarization conversion element 423 is disposed between the second lens array 422 and the superimposing lens 424. Such a polarization conversion element 423 converts the light from the second lens array 422 into approximately one type of linearly polarized light, thereby improving the light use efficiency in the optical device 45.
Specifically, each partial light converted into approximately one type of linearly polarized light by the polarization conversion element 423 is finally superimposed on a liquid crystal panel 451 (to be described later) of the optical device 45 by the superimposing lens 424. In the projector 1 using the liquid crystal panel 451 of the type that modulates polarized light, only one type of linearly polarized light can be used, so almost half of the light from the light source lamp 411 that emits other types of randomly polarized light is not used. Therefore, by using the polarization conversion element 423, the light beam emitted from the light source lamp 411 is converted into substantially one type of linearly polarized light, and the light use efficiency in the optical device 45 is increased.
Such a polarization conversion element 423 is introduced in, for example, Japanese Patent Laid-Open No. 8-304739.

  The color separation optical system 43 includes two dichroic mirrors 431 and 432, and a reflection mirror 433. The light beams emitted from the integrator illumination optical system 42 by the dichroic mirrors 431 and 432 are converted into red (R) and green (G ) And blue (B).

The relay optical system 44 includes an incident side lens 441, a relay lens 443, and reflection mirrors 442 and 444. The liquid crystal panel 451R has a function of leading to the liquid crystal panel 451R.
At this time, the dichroic mirror 431 of the color separation optical system 43 transmits the red light component and the green light component of the light beam emitted from the integrator illumination optical system 42 and reflects the blue light component. The blue light reflected by the dichroic mirror 431 is reflected by the reflection mirror 433, passes through the field lens 455, and reaches a later-described liquid crystal panel 451B for blue light of the optical device 45. The field lens 455 converts each partial light beam emitted from the second lens array 422 into a light beam parallel to the central axis (principal light beam). The same applies to the field lens 455 provided on the light beam incident side of the other light modulators for green light and red light.

Of the red light and green light transmitted through the dichroic mirror 431, the green light is reflected by the dichroic mirror 432, passes through the field lens 455, and reaches the liquid crystal panel 451G for green light. On the other hand, the red light passes through the dichroic mirror 432, passes through the relay optical system 44, passes through the field lens 455, and reaches the liquid crystal panel 451R for red light.
Note that the relay optical system 44 is used for red light because the optical path length of red light is longer than the optical path lengths of the other color lights, thereby preventing a reduction in light utilization efficiency due to light divergence or the like. It is to do. That is, this is to transmit the partial light beam incident on the incident side lens 441 to the field lens 455 as it is. The relay optical system 44 is configured to pass red light of the three color lights, but is not limited thereto, and may be configured to pass blue light or green light, for example.

  The optical device 45 modulates an incident light beam in accordance with image information to form a color image, and includes three incident-side polarizing plates 452 on which the respective color lights separated by the color separation optical system 43 are incident. The three liquid crystal panels 451 (light liquid crystal panel 451R for red light, 451G for green light, 451G for blue light, and liquid crystal panel for blue light) as light modulation elements arranged in the latter stage of the optical path of each incident side polarizing plate 452 451B), three exit-side polarizing plates 453 arranged in the rear stage of the optical path of each liquid crystal panel 451, and a cross dichroic prism 454 as a color synthesizing optical device. The incident-side polarizing plate 452, the liquid crystal panel 451, the exit-side polarizing plate 453, and the cross dichroic prism 454 are integrally unitized.

  The incident-side polarizing plate 452 receives the respective color lights whose polarization directions are aligned in approximately one direction by the polarization conversion element 423, and is substantially the same as the polarization axis of the light beams aligned by the polarization conversion element 423 among the incident light beams. Only polarized light in the direction is transmitted, and other light beams are absorbed. The incident-side polarizing plate 452 has a configuration in which a polarizing film is pasted on a translucent substrate such as sapphire glass or quartz.

  The liquid crystal panel 451 corresponds to the light modulation device of the present invention, and has a configuration in which a liquid crystal element as an electro-optical material is hermetically sealed between a pair of transparent glass substrates, and according to a drive signal output from a control substrate, The alignment state of the liquid crystal element in the image forming region is controlled, and the polarization direction of the polarized light beam emitted from the incident side polarizing plate 452 is modulated.

  The exit-side polarizing plate 453 has the same configuration as the incident-side polarizing plate 452, and has a polarization axis that is orthogonal to the transmission axis of the light flux in the incident-side polarizing plate 452 among the light beams emitted from the image forming area of the liquid crystal panel 451. It transmits only the luminous flux it has and absorbs other luminous flux.

  The cross dichroic prism 454 corresponds to the color synthesis optical device of the present invention, and is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the emission side polarizing plate 453. The cross dichroic prism 454 has a 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. These dielectric multilayer films reflect each color light emitted from the liquid crystal panels 451R and 451B via the emission side polarizing plate 453, and transmit the color light emitted from the liquid crystal panel 451G via the emission side polarizing plate 453. In this manner, the color lights modulated by the liquid crystal panels 451R, 451G, and 451B are combined to form a color image.

The projection lens 46 enlarges and projects the optical image formed by the optical device 45, and the front end portion in the projection direction is exposed from the exterior case 2. The projection lens 46 is attached to a head body 48 described later via a projection position adjusting device 5 described later.
As described above, the projection lens 46 has a plurality of lenses (not shown) including a converging lens and a diverging lens, and an optical axis is set inside, and the plurality of lenses are positioned in accordance with the optical axis. And a substantially cylindrical lens barrel 461 that is held.
Among these, the lens barrel 461 is formed with a flange portion 462 that protrudes from the outer periphery of the lens barrel 461 in the out-of-plane direction and has a substantially rectangular shape when viewed from the optical axis direction.

  The optical component casing 47 is a casing in which a predetermined illumination optical axis A is set inside and holds the optical components 42 to 45 described above at predetermined positions with respect to the illumination optical axis A. The optical component casing 47 includes a light source device storage member 471 that stores the light source device 41, a component storage member 472, and a lid-like member (not shown).

Among these, the component storage member 472 is configured as a synthetic resin box-shaped housing having a substantially U-shaped cross section with an upper opening, and the opening is covered with a lid-shaped member.
The component storage member 472 has one end connected to the light source device storage member 471 and the other end connected to the head body 48 that holds and fixes the optical device 45. A plurality of grooves are formed inside the component storage member 472, and the optical components 421 to 424, 431 to 433, 441 to 444, and 455 are positioned and fixed in the grooves so as to be fitted from above.

(3) Structure of the head body 48 The head body 48 corresponds to a support body of the present invention, fixes the optical device 45, and integrally integrates the projection lens 46 and a projection position adjusting device 5 described later so as to be movable. This unit is attached to the end of the component housing member 472 on the light beam exit side. The head body 48 is formed in a substantially L shape in a side view from a metal material such as an aluminum alloy or a magnesium alloy.

FIG. 3 is an exploded perspective view of the projection position adjusting device 5. That is, FIG. 3 is a diagram illustrating the structure of the head body 48 and the projection position adjusting device 5.
As shown in FIG. 3, the head body 48 includes a horizontal portion 481 positioned on the light beam incident side, and a vertical portion 482 positioned on the light beam emission side and standing upright from the end of the horizontal portion 481 on the light beam emission side. And is configured.
Among these, the horizontal portion 481 is formed in a two-step shape when viewed from the side, and the optical device 45 is position-adjusted and fixed to a fixing portion 4811 formed on the light incident side where the step is high. The

The vertical portion 482 has a substantially rectangular shape when viewed from the optical axis direction, and the projection position adjusting device 5 and the projection lens 46 supported by the projection position adjusting device 5 are attached to the vertical portion 482.
A substantially rectangular opening 4821 through which the light beam emitted from the optical device 45 fixed to the horizontal part 481 passes and the end of the light incident side of the projection lens 46 is inserted is substantially at the center of the vertical part 482. Is formed.
On the surface 482A on the light beam exit side of the vertical portion 482, movement restricting portions 4822 and 4823 that protrude in the out-of-plane direction and extend in the horizontal direction are formed above and below the opening 4821. These movement restricting parts 4822 and 4823 define a movable range in the vertical direction of the movable frame 51 as a moving member of the projection position adjusting device 5 described later.
In addition, a guide 4824 that protrudes in the out-of-plane direction and extends in the up-down direction is formed on the left side of the opening 4821 when the surface 482A is viewed from the light beam exit side. The guide 4824 guides the movement of the movable frame 51 of the projection position adjusting device 5 described later, and is inserted through a guide hole 513 formed in the movable frame 51 to guide the movement of the movable frame 51 in the vertical direction. .

A substantially semicircular recess 4825 is formed at each of the horizontal ends at the center in the vertical direction of the surface 482A and both ends at the lower end in the horizontal direction, and a hole 4826 that passes through the vertical portion 482 is formed in each recess 4825. Has been. These holes 4826 are holes through which screws for fixing the head body 48 to the component housing member 472 are inserted.
Further, holes 4827 penetrating through the vertical portions 482 are formed in the portions near the center in the horizontal direction from the four corner portions of the surface 482A. These four holes 4827 are holes through which screws 483 for attaching a pressing frame 52 as a pressing member of the projection position adjusting device 5 described later are inserted into the vertical portion 482.
Furthermore, a substantially cylindrical protrusion 4828 that protrudes in two steps in the out-of-plane direction is formed at the upper left end portion of the surface 482A as viewed from the light beam exit side. The protrusion 4828 rotatably supports the pinion 54 of the projection position adjusting device 5 described later.

(4) Configuration of Projection Position Adjustment Device 5 The projection position adjustment device 5 supports the projection lens 46 so as to be movable in a direction substantially orthogonal to the projection direction of the optical image by the projection lens 46. The position adjusting device 5 is attached to the vertical portion 482 of the head body 48 as described above.
As shown in FIG. 3, the projection position adjusting device 5 includes a movable frame 51, a pressing frame 52, a pair of leaf springs 53, a pinion 54, a dial 55 that rotates the pinion 54, and a screw 56. Configured.
Among these, the pinion 54 is formed in a substantially cylindrical shape. Teeth 541 are formed on the light incident side of the pinion 54 along the axial direction of the pinion 54. Further, a notch having a substantially semicircular cross section is formed on the light exit side of the pinion 54, and this portion serves as a fitting portion 542 that fits the dial 55.
The dial 55 is formed in a substantially circular shape in plan view, and a substantially semicircular hole 551 through which the fitting portion 542 of the pinion 54 is inserted is formed in a substantially central portion.

The movable frame 51 corresponds to the moving member of the present invention, has a substantially rectangular shape when viewed from the optical axis direction, and has a substantially circular opening 511 through which the lens barrel 461 of the projection lens 46 is inserted. Has been. The surface on the light beam incident side of the movable frame 51 is in contact with the surface 482 A on the light beam emission side of the vertical portion 482 of the head body 48.
On the surface 51A of the movable frame 51 on the light beam exit side, substantially circular screw holes 512 are formed at the four corners, respectively. These screw holes 512 are holes through which screws 56 for fixing the projection lens 46 to the movable frame 51 are inserted. That is, the surface 51A of the movable frame 51 on the light emission side is in contact with the surface on the light incident side of the flange portion 462 of the projection lens 46. In this state, the screw hole 512 formed in the surface 51A and the hole 462A formed in the four corners of the flange portion 462 are positioned so as to correspond to each other, and then the screw 56 inserted through the hole 462A of the flange portion 462 is inserted. The movable frame 51 and the projection lens 46 are fixed by being inserted into the screw hole 512 and screwed.

Furthermore, a substantially rectangular guide hole 513 is formed along the vertical direction on the left side of the opening 511 when the movable frame 51 is viewed from the light beam exit side. When the movable frame 51 is brought into contact with the vertical portion 482 of the head body 48, the guide hole 513 is inserted with the guide 4824 formed in the vertical portion 482. Therefore, the guide hole 513 is formed so that the horizontal dimension is substantially the same as or slightly larger than the guide 4824, and the vertical dimension is larger than the guide 4824. .
In addition, a rack portion 514 is formed on the left end surface of the movable frame 51 as viewed from the light beam exit side, that is, on the surface facing the protrusion 4828 of the vertical portion 482 of the head body 48 along the forming direction of the end surface. Has been. The rack portion 514 meshes with the teeth 541 of the pinion 54 that is pivotally supported by the protrusion 4828. Therefore, the movable frame 51 moves upward or downward with the rotation of the pinion 54, and the projection lens 46 moves upward or downward with the movement of the movable frame 51.

  The pressing frame 52 corresponds to a pressing member of the present invention, and presses the movable frame 51 and the projection lens 46 against the surface 482A of the vertical portion 482 of the head body 48. A pair of leaf springs 53 are interposed along the vertical direction between the pressing frame 52 and the flange portion 462 of the projection lens 46, and the pressing frame 52 causes the leaf spring 53 to be opposite to the light beam emission direction. By pressing in the direction, the projection lens 46 and the movable frame 51 that holds the projection lens 46 are urged and supported by the surface 482A of the vertical portion 482 of the head body 48. The leaf spring 53 is a metal member having a substantially L shape in side view.

The pressing frame 52 has a substantially rectangular shape when viewed from the optical axis direction, and is formed larger than the movable frame 51 and the flange portion 462 of the projection lens 46. The size of the pressing frame 52 is substantially the same as the size of the vertical portion 482 of the head body 48.
An opening 521 is formed substantially in the center when viewed from the optical axis direction of the pressing frame 52. Although the projection lens 46 is inserted through the opening 521, the opening 521 has a substantially oval shape because the projection lens 46 moves in the vertical direction.

Four cylindrical portions 522 that protrude in the out-of-plane direction are formed at portions that are closer to the center in the horizontal direction from the four corner portions of the surface on the light beam incident side of the pressing frame 52. The positions of the cylindrical portions 522 are positions corresponding to the holes 4827 formed in the vertical portion 482 of the head body 48, and screw holes are formed at the tip portions of the respective cylindrical portions 522. . A screw 483 inserted through a hole 4827 formed in the vertical portion 482 of the head body 48 is attached to these screw holes, so that the movable frame 51 and the projection lens 46 are opposite to the optical axis direction, in this case, the light beam emission direction. The pressing frame 52 can be fixed to the vertical portion 482 of the head body 48 while being biased in the direction.
Further, a groove portion 525 (not shown in FIG. 3) into which the leaf spring 53 is fitted is formed on the surface on the light beam incident side of the pressing frame 52 in the vicinity of both ends in the horizontal direction with the opening 521 interposed therebetween. This is to prevent the leaf spring 53 interposed between the pressing frame 52 and the flange portion 462 of the projection lens 46 from being displaced due to the movement of the projection lens 46.

  A substantially rectangular recess 523 is formed on the upper left end of the pressing frame 52 on the light beam exit side as viewed from the light beam exit side, and a hole 524 is formed in the recess 523. The fitting portion 542 of the pinion 54 that is pivotally supported by the projection portion 4828 of the vertical portion 482 of the head body 48 is inserted into the hole 524, and the fitting portion 542 is exposed to the light emission side of the pressing frame 52. A dial 55 is attached to the fitting portion 542 of the pinion 54 exposed to the light emission side of the pressing frame 52.

A method for attaching the projection position adjusting device 5 to the head body 48 will be described.
First, the projection lens 46 is attached to the movable frame 51. At this time, the flange portion 462 is positioned after positioning the light flux incident surface of the flange portion 462 formed on the lens barrel 461 of the projection lens 46 and the surface 51A of the movable frame 51 on the light flux exit side. Screws 56 are inserted through the holes 462A and the screw holes 512 of the movable frame 51, and each is fixed by screws. Thereby, the projection lens 46 and the movable frame 51 are fixed.

After fixing the movable frame 51 and the projection lens 46, the surface 482A on the light beam emission side of the vertical portion 482 of the head body 48 and the surface on the light beam incident side of the movable frame 51 are brought into contact with each other. Here, the guide 4824 formed in the vertical portion 482 of the head body 48 is inserted into the guide hole 513 formed in the movable frame 51. Thereby, the movement of the movable frame 51 and the projection lens 46 in the direction orthogonal to the projection direction of the projection lens 46 is restricted in the vertical direction.
Then, the pinion 54 is attached to the protrusion 4828 formed on the vertical portion 482 of the head body 48. At this time, the pinion 54 is attached to the protruding portion 4828 so that the teeth 541 of the pinion 54 and the rack portion 514 of the movable frame 51 mesh with each other.

  Thereafter, the leaf spring 53 is fitted into a groove 525 (not shown in FIG. 3) formed on the surface of the pressing frame 52 on the light beam incident side. The lens barrel 461 of the projection lens 46 is inserted into the opening 521 of the pressing frame 52, and the leaf spring 53 is interposed between the pressing frame 52 and the flange 462 of the projection lens 46. Then, the pressing frame 52 is attached to the vertical portion 482 of the head body 48. At this time, the screw 483 inserted through the hole 4827 formed in the vertical portion 482 of the head body 48 is attached to the screw hole of the cylindrical portion 522 formed on the surface of the pressing frame 52 on the light beam incident side, thereby pressing. With the frame 52 biasing the movable frame 51 and the projection lens 46 in the optical axis direction, the pressing frame 52 is fixed to the vertical portion 482 of the head body 48.

When the pressing frame 52 is fixed, the fitting portion 542 of the pinion 54 is inserted into the hole 524 formed in the pressing frame 52 so that the fitting portion 542 is exposed to the light emission side of the pressing frame 52. To.
A dial 55 is attached to the fitting portion 542 of the pinion 54. More specifically, the fitting portion 542 of the pinion 54 is fitted into a substantially semicircular hole 551 formed in the dial 55, so that the pinion 54 and the dial 55 can rotate on the protrusion 4828 of the head body 48. It is pivotally supported.

Here, the movement to the projection lens 46 by the projection position adjusting device 5 will be described.
When the dial 55 is rotated in the X1 direction in FIG. 3, the pinion 54 is rotated in the same direction (X1 direction) with the rotation. Since the pinion 54 meshes with the rack portion 514 of the movable frame 51, the rotation of the pinion 54 causes the movable frame 51 and the projection lens 46 to move along the guide 4824 formed in the vertical portion 482 of the head body 48. Move upward (Y1 direction in FIG. 1).
Further, when the dial 55 is rotated in the X2 direction in FIG. 3, the pinion 54 is rotated in the X2 direction. As the pinion 54 is rotated, the movable frame 51 and the projection lens 46 fixed to the movable frame 51 are lowered. It moves in the direction (Y2 direction in FIG. 1).
By the operation as described above, the projection lens 46 moves in the vertical direction, and the projection position of the optical image by the projection lens 46 moves in the vertical direction.

The following effects can be obtained by the projector 1 including the projection position adjusting device 5 of the present embodiment as described above.
That is, the projection position adjusting device 5 is attached to the vertical portion 482 of the head body 48. The movable frame 51 of the projection position adjusting device 5 holds the projection lens 46 and abuts on the surface 482A on the light beam emission side of the vertical portion 482 constituting the head body 48 and is similarly attached to the head body 48. In accordance with the rotation of the surface slid up and down relative to the surface 482A. The movable frame 51 is urged and supported on the vertical portion 482 in the optical axis direction by the pressing frame 52, and the pressing frame 52 is fixed to the vertical portion 482 by screws 483. According to this, the factors affecting the distance between the optical device 45 and the projection lens 46 are the dimension in the optical axis direction of the vertical portion 482 of the head body 48 and the dimension in the optical axis direction of the movable frame 51.

Here, in the conventional projection position adjusting device, other members are interposed between the head body 48 and the movable frame 51, and the factors that affect the distance between the optical device 45 and the projection lens 46 are described above. In addition to the two dimensions, the dimension of the other member in the optical axis direction is added, and the error of each member is accumulated, and the error of the distance at the time of designing and manufacturing becomes large.
On the other hand, in the projector 1 according to the present embodiment, since the other members can be omitted, the accumulated error can be reduced as compared with the case where the conventional projection position adjusting device is employed. For this reason, an error in the distance between the optical device 45 and the projection lens 46 can be reduced, and it becomes easy to keep the distance constant. And the fall of tracking performance can be suppressed. Accordingly, it is possible to suppress a decrease in projection performance.

  Further, when the projection position adjusting device 5 of the present embodiment is used with respect to the conventional projection position adjusting device, the number of elements that affect the distance between the optical device 45 and the projection lens 46 is reduced. Therefore, the error between the design and manufacture of the distance can be reduced. According to this, the error between the dummy of the projection position adjusting device 5 used when fixing the optical device 45 to the horizontal portion 481 of the head body 48 and the projection position adjusting device 5 actually incorporated as a product is reduced. Therefore, the dummy can be used when adjusting the position of the liquid crystal panel 451 of the optical device 45 at the time of manufacture. Therefore, the manufacturing process of the projector 1 can be simplified.

[2. Second Embodiment]
Next, a projector according to a second embodiment of the invention will be described.
The projector according to the second embodiment has the same configuration as that of the projector 1 according to the first embodiment described above, but has a difference in the configuration of the projection position adjusting device. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 4 is an exploded perspective view of the projection position adjusting device 6 for the projector according to the second embodiment of the present invention. That is, FIG. 4 is a diagram illustrating the structure of the head body 48 and the projection position adjusting device 6.
The projector 1 according to this embodiment includes a projection position adjusting device 6 shown in FIG. 4 instead of the projection position adjusting device 5 shown in the first embodiment. Similar to the projection position adjusting device 5, the projection position adjusting device 6 is attached to the head body 48 while holding the projection lens 46A, and moves the projection lens 46A in the vertical direction.

Here, the configuration of the projection lens 46A used in the projector of the second embodiment will be described.
The projection lens 46A has the same configuration as the projection lens 46, but differs in the shape of the flange portion 46A2. That is, the projection lens 46A includes a plurality of lenses and a lens barrel 46A1 that supports the plurality of lenses, and the lens barrel 46A1 has a flange that protrudes in a substantially rectangular shape from the outer peripheral surface when viewed from the optical axis direction. A portion 46A2 is formed. Holes 46A3 through which screws 56 are inserted are respectively formed at the four corners of the surface on the light beam incident side of the flange portion 46A2, and the holes 46A3 have a substantially circular shape in a plan view projecting out of the plane. A protrusion 46A4 is formed. These protrusions 46A4 house the heads of the screws 56 that pass through the holes 46A3. Further, the contact surface 46A6 formed on the light incident side of these protrusions 46A4 is formed to be a sliding surface that slides along the surface 482A on the light emitting side of the vertical portion 482 constituting the head body 48. Has been.
In addition, a hole 46A5 penetrating in the optical axis direction is formed in the flange portion 46A2, and a positioning pin 616 formed in a movable frame 61 of the projection position adjusting device 6 to be described later is inserted into the hole 46A5 so that the movable frame is inserted. The positioning of the projection lens 46A at 61 is performed.

As shown in FIG. 4, the projection position adjusting device 6 includes a movable frame 61, a pressing frame 52, a pair of leaf springs 53, a pinion 54, and a dial 55.
Among these, unlike the movable frame 51, the movable frame 61 is located on the light beam exit side of the projection lens 46A.
The movable frame 61 corresponds to the moving member of the present invention, and has the same configuration as the movable frame 51 described above. A substantially circular opening 611 corresponding to the lens barrel 46A1 of the projection lens 46A is formed at substantially the center of the movable frame 61 when viewed from the optical axis direction.
A saw blade-shaped rack portion 613 is formed on the right end surface of the movable frame 61 when viewed from the optical axis direction, and is an opening extending vertically from the rack portion 613 toward the center. A guide hole 614 is formed.

Further, a concave portion 615 having a shape and a dimension corresponding to the flange portion 46A2 of the projection lens 46A is formed on the surface 61B of the movable frame 61 on the light beam incident side. The position of the recess 615 is formed so as to be inside with respect to the guide hole 614 when viewed from the optical axis direction. The depth dimension of the recess 615 is smaller than the thickness dimension of the flange 46A2 of the projection lens 46A, that is, the dimension in the optical axis direction.
Screw holes 612 to which screws 56 for fixing the projection lens 46A are screwed are formed at the four corners of the recess 615, respectively.
The recess 615 is formed with a positioning pin 616 that protrudes out of the plane. The positioning pin 616 is a pin for positioning the flange portion 46A2 of the projection lens 46A when the projection lens 46A is brought into contact with the recess 615, and is inserted into a hole 46A5 formed in the flange portion 46A2. .

A method of attaching the projection position adjusting device 6 to the head body 48 will be described.
First, the projection lens 46 </ b> A is fixed to the movable frame 61. Here, the projection lens 46A is attached to the movable frame 61 such that the flange portion 46A2 of the projection lens 46A is fitted into the concave portion 615 formed on the light beam incident side surface 61B of the movable frame 61. At this time, the positioning of the projection lens 46A with respect to the movable frame 61 is facilitated by inserting the positioning pin 616 of the movable frame 61 into the hole 46A5 formed in the flange portion 46A2 of the projection lens 46A. Can do.
After positioning the projection lens 46A with respect to the movable frame 61, screws 56 are inserted into the respective holes 46A3 formed in the flange portion 46A2 of the projection lens 46A, and the screws 56 are inserted into the screw holes 612 formed in the movable frame 61. Secure with screws. Accordingly, the projection lens 46A is fixed and supported on the movable frame 61.

Next, the movable frame 61 that supports the projection lens 46 </ b> A is attached to the vertical portion 482 of the head body 48. At this time, the contact surface 46A6 formed on the light beam incident side of each protrusion 46A4 of the flange portion 46A2 of the projection lens 46A is brought into contact with the surface 482A on the light beam exit side of the vertical portion 482. Thereby, the contact surface 46A6 of the projection lens 46A becomes a sliding surface with respect to the surface 482A of the vertical portion 482. Further, by engaging the guide hole 614 formed in the movable frame 61 so that the guide 4824 (not shown in FIG. 4) formed in the vertical portion 482 is fitted, the movable frame 61 and the projection with respect to the vertical portion 482 are projected. The moving direction of the lens 46A is restricted to the up and down direction.
Thereafter, the pinion 54 is attached to the protrusion 4828 formed on the vertical portion 482 of the head body 48 so as to mesh with the rack portion 613 formed on the movable frame 61.

Then, after the leaf spring 53 is fitted into the groove portion 525 of the pressing frame 52, the movable frame 61 is urged by the leaf spring 53 toward the light beam emission side surface of the vertical portion 482 of the head body 48 in the optical axis direction. In this way, the pressing frame 52 is screwed to the vertical portion 482 of the head body 48. In this screw fixing, as described above, the screw 483 inserted through the hole 4827 formed in the vertical portion 482 of the head body 48 is screwed into the screw hole formed in the cylindrical portion 522 of the pressing frame 52. Is done by.
At this time, the fitting portion 542 of the pinion 54 that is pivotally supported by the projection portion 4828 formed on the vertical portion 482 of the head body 48 emits the light flux of the pressing frame 52 through the hole 524 of the pressing frame 52. The dial 55 is attached to the fitting portion 542 so as to be exposed to the side.
As described above, the projection position adjusting device 6 and the projection lens 46 </ b> A are attached to the vertical portion 482 of the head body 48. Note that the movement of the projection lens 46A by the projection position adjustment device 6 is the same as that of the projection position adjustment device 5 described above, and thus the description thereof is omitted.

The projector having the projection position adjusting device 6 of the present embodiment as described above can achieve the same effects as the projector 1 having the projection position adjusting device 5 shown in the first embodiment, and the following effects. Can be played.
That is, the movable frame 61 constituting the projection position adjusting device 6 is located on the light beam exit side of the flange portion 46A2 of the projection lens 46A. Then, the contact surface 46A6 of the flange portion 46A2 of the projection lens 46A is brought into contact with the head body 48, and the movable frame 61 engages with a guide 4824 formed on the head body 48 to move the projection lens 46A up and down. Move in the direction.

Here, when the projection lens 46A is moved by the movable frame 61, the surface 61B on the light beam incident side of the movable frame 61 does not directly contact the surface 482A on the light beam emission side of the vertical portion 482 constituting the head body 48. A contact surface 46A6 formed on the flange portion 46A2 of the projection lens 46A is in contact with the surface 482A of the vertical portion 482 and slides along the surface 482A.
According to this, since the dimension in the optical axis direction of the movable frame 61, that is, the thickness dimension does not affect the distance between the projection lens 46A and the optical device 45, the light incident surface of the projection lens 46A, The number of parts that affect the distance from the image forming area of the liquid crystal panel 451 can be further reduced. Accordingly, it is possible to further suppress the deterioration of the projection performance due to the projection lens 46A.

In the present embodiment, the flange portion 46A2 of the projection lens 46A and the projection position adjusting device 6 are disposed on the surface of the vertical portion 482 on the light beam exit side, but are disposed on the surface of the vertical portion 482 on the light beam incident side. May be. In this case, the pressing frame 52, the movable frame 61, the flange portion 46A2 of the projection lens 46A, and the vertical portion 482 are arranged in this order from the light beam incident side to the light beam emission side, and the contact surface 46A6 of the flange portion 46A2 of the projection lens 46A is It is formed so as to face the light beam emission side, and comes into contact with a surface formed on the light beam incident side of the vertical portion 482 of the head body 48.
In such a case, an effect equivalent to that of the present embodiment shown in FIG. 4 can be obtained, and the center of gravity of the projection lens 46A is close to the vertical portion 482, so that the moment applied to the vertical portion 482 by the projection lens 46A is reduced. can do. As a result, the amount of deformation of the vertical portion 482 (particularly, the change in angle with respect to the horizontal portion 481) can be reduced, and a reduction in projection performance can be further suppressed.

[3. Third Embodiment]
Next, a projector according to a third embodiment of the invention will be described.
The projector according to the third embodiment has the same configuration as that of the projector 1 according to the first embodiment described above, but has a difference in the configuration of the projection position adjusting device. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 5 is an exploded perspective view of the head body 49 and the projection position adjusting device 7 of the projector according to the third embodiment of the present invention. That is, FIG. 5 is a diagram illustrating the structure of the head body 49 and the projection position adjusting device 7.
In the projection position adjusting device 7 of this embodiment, members corresponding to the movable frames 51 and 61 in the above-described projection position adjusting devices 5 and 6 are integrally formed on the flange portion 46B2 of the projection lens 46B. That is, the flange portion 46B2 of the projection lens 46B is configured to also serve as a movable frame.
As shown in FIG. 5, the projection position adjusting device 7 includes a flange portion 46B2 formed on the lens barrel 46B1 of the projection lens 46B, a pinion 54, a dial 55, and a pressing component 57. Among these, the pressing component 57 corresponds to a pressing member of the present invention, and includes a washer 571, a coil spring 572, and a long screw 573.

A contact surface 46B5 is formed on the light beam incident side of the flange portion 46B2, and slides along a light beam emission side surface 492A of the vertical portion 492 constituting the head body 49 described later, thereby moving the projection lens 46B in the vertical direction. It is to be moved. As described above, the flange portion 46B2 is integrally formed with the lens barrel 46B1 of the projection lens 46B. Specifically, the flange portion 46B2 is formed so as to protrude from the outer peripheral surface of the lens barrel 46B1 so that the projection lens 46B has a substantially rectangular shape when viewed from the optical axis direction.
In the four corners of the flange portion 46B2, long holes 46B3 penetrating the flange portion 46B2 are formed. Further, the surface of the flange portion 46B2 on the light beam exit side protrudes out of the plane, and a saw blade-shaped rack portion 46B4 is formed on the left end surface when viewed from the light beam exit side. Further, although not shown in detail, a guide hole extending in the vertical direction is formed at a position near the center of the flange portion 46B2 from the rack portion 46B4.

Here, the head body 49 to which the projection position adjusting device 7 and the projection lens 46B are attached will be described.
The head body 49 includes a stepwise horizontal portion 491 on the light beam incident side, and a vertical portion 492 that stands substantially vertically from the end of the horizontal portion 491 on the light beam emission side.
Among these, the position of the optical device 45 is adjusted and fixed to the horizontal portion 491.
Further, the projection lens 46B is attached to the vertical portion 492 so as to be slidable in the vertical direction via the flange portion 46B2. A substantially rectangular opening 4921 through which the light beam emitted from the optical device 45 is transmitted and the projection lens 46B is inserted is formed at substantially the center of the vertical portion 492.

A guide 4922 that protrudes in the out-of-plane direction and extends in the vertical direction is formed on the left side of the opening portion 4921 when viewed from the light-beam emission side on the surface 492A of the head body 49 on the light-beam emission side.
Cylindrical portions 4923 projecting out of the plane are formed at both ends in the horizontal direction above and below the opening portion 4921 of the surface 492A, and screw holes are formed at the tip of the cylindrical portion 4923. .
Further, a concave portion 4924 and a hole 4925 through which screws for fixing the head body 49 to the component storage member 472 of the optical component casing 47 are respectively formed at the center in the vertical direction and the lower end of the surface 492A. ing.
Further, a protrusion 4926 that protrudes in two steps from the surface 492A in the out-of-plane direction is formed at the upper left end when the surface 492A is viewed from the light beam exit side. The pinion 54 is rotatably supported by the protrusion 4926.

The attachment of the projection position adjusting device 7 as described above to the head body 49 will be described.
First, the contact surface formed on the light beam incident side surface of the flange portion 46B2 of the lens barrel 46B1 of the projection lens 46B is brought into contact with the light beam exit surface 492A of the vertical portion 492 constituting the head body 49. At this time, the cylindrical portion 4923 formed on the surface 492A of the vertical portion 492 passes through the long hole 46B3 formed in the flange portion 46B2, and the guide 4922 formed in the vertical portion 492 is provided with the flange portion. The flange portion 46B2 is positioned so as to engage with a guide hole (not shown) formed in 46B2.

  Next, the flange portion 46 </ b> B <b> 2 is pressed and fixed to the vertical portion 492 of the head body 49 using the pressing component 57. Specifically, the washer 571 and the coil spring 572 are passed through the cylindrical portion 4923 of the vertical portion 492 inserted through the long hole 46B3 of the flange portion 46B2, and the long screw 573 is inserted into the screw hole formed in the cylindrical portion 4923. The coil spring 572 is fixed to the cylindrical portion 4923 by screwing. At this time, the washer 571 comes into contact with the flange portion 46B2. Accordingly, the flange portion 46B2 is biased and supported on the surface 492A of the vertical portion 492 by the biasing force of the coil spring 572 in the optical axis direction.

  Thereafter, the pinion 54 is attached to the protrusion 4926 formed on the surface 492A of the vertical portion 492. At this time, the pinion 54 is attached so that the pinion 54 and the rack portion 46B4 formed on the flange portion 46B2 mesh with each other. Then, the dial 55 is attached to the pinion 54. Thereby, the pinion 54 rotates with the rotation of the dial 55. As the pinion 54 rotates, the flange portion 46B2 formed with the rack portion 46B4 that meshes with the pinion 54 is guided by the guide 4922 formed in the vertical portion 492 of the head body 49, and the vertical portion 492 And the projection lens 46B is moved in the vertical direction.

The projector having the projection position adjusting device 7 of the present embodiment as described above can achieve the same effects as the projector having the projection position adjusting device 6 shown in the second embodiment, and the following effects. Can play.
That is, in the projection position adjusting device 7, the flange portion 46B2 formed in the lens barrel 46B1 of the projection lens 46B is slidably brought into contact with the light incident surface 492A of the vertical portion 492 constituting the head body 49, As the flange 46B2 slides in the vertical direction, the projection lens 46B moves in the vertical direction.
According to this, it is not necessary to separately provide members corresponding to the movable frames 51 and 61 of the projection position adjusting devices 5 and 6 described above. Therefore, the number of parts constituting the projection position adjusting device 7 can be reduced, and the configuration of the projection position adjusting device 7 can be simplified.

Thereby, the number of components that affect the distance between the projection lens 46B and the optical device 45 can be further reduced. Therefore, it is possible to simplify the configuration of the projection position adjusting device 7, and thus the projector, and to prevent the deterioration of the projection performance by the projection lens 46B.
Further, along with this, the optical device 45, the projection lens 46B, and the projection position adjusting device 7 can be more easily attached to the head body 49, and these manufacturing processes including the position adjustment can be simplified. .

In the present embodiment, the flange portion 46B2 of the projection lens 46B is disposed on the surface on the light beam exit side of the vertical portion 492 of the head body 49, but may be disposed on the surface on the light beam incidence side of the vertical portion 492. In this case, the contact surface 46B5 of the flange portion 46B2 of the projection lens 46B is formed so as to face the light beam emission side, and is in contact with the surface formed on the light beam incident side of the vertical portion 492.
In such a case, the same effect as the present embodiment shown in FIG. 5 can be obtained, and the center of gravity of the projection lens 46B is close to the vertical portion 492, so that the moment applied to the vertical portion 492 by the projection lens 46B is reduced. can do. As a result, the amount of deformation of the vertical portion 492 (particularly, the change in angle with respect to the horizontal portion 491) can be reduced, and a reduction in projection performance can be further suppressed.

[4. Fourth Embodiment]
Next, a projector according to a fourth embodiment of the invention will be described.
The projector according to the fourth embodiment has the same configuration as that of the projector 1 according to the first to third embodiments described above, but is different in that the head body is formed integrally with the optical component housing. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 6 is an exploded perspective view for explaining the optical component housing 9 and the projection position adjusting device 8 according to the fourth embodiment of the present invention.
As shown in FIG. 6, the projector according to the present embodiment includes a projection position adjusting device 8 and corresponds to the head bodies 48 and 49 instead of the optical component casing 47 and the head bodies 48 and 49 described above. An optical component housing 9 in which members to be integrated are integrally formed is provided.

  The projection position adjusting device 8 is attached to a projection lens support portion 913 of an optical component housing 9 to be described later, and moves the projection lens 46 in the vertical direction along a surface 913A on the light beam emission side of the projection lens support portion 913. Is. The projection position adjusting device 8 includes a movable frame 51, a pressing frame 82, a pair of leaf springs 53, a pinion 54, and a dial 55. Among these, description of the movable frame 51, the leaf spring 53, the pinion 54, and the dial 55 is omitted.

  The pressing frame 82 has the same configuration as the pressing frame 52 described above. Specifically, the pressing frame 82 is formed in a substantially rectangular shape when viewed from the optical axis direction, and a substantially oval opening 821 through which the projection lens 46 is inserted is formed in a substantially central portion of the pressing frame 82. Has been.

On the surface on the light beam incident side of the pressing frame 82, cylindrical portions 822 extending in the out-of-plane direction are formed at locations near the center in the horizontal direction from the four corner portions. The cylindrical portions 822 are formed with holes 8221 penetrating the pressing frame 82 in the axial direction, and the pressing frames 82 are provided in the projection lens support portion of the optical component housing 9 to be described later. A long screw 573 that is fixed to 913 is inserted from the light beam exit side.
Although not shown in detail on the surface of the pressing frame 82 on the light beam incident side, a groove portion that prevents the leaf spring 53 that biases the projection lens 46 against the projection lens support portion 913 from extending is vertically extended. It is formed to do.

  A substantially rectangular concave portion 523 is formed in the upper left end portion of the surface 82A of the pressing frame 82 on the light beam emission side when viewed from the light beam emission side, and a substantially circular hole 824 is formed in the recess 523. . The fitting portion 542 of the pinion 54 is exposed from the hole 824, and the dial 55 is attached to the fitting portion 542.

  The optical component casing 9 positions and fixes each device and each optical component constituting the optical unit 4 on the illumination optical axis A in the same manner as the optical component casing 47 described above. The optical component housing 9 includes a component storage member 91 that positions and fixes the light source device 41 and the optical components 42 to 45, and a lid-like member (not shown) that covers the component storage member 91. Has been.

  The component storage member 91 supports the light source storage unit 911 that stores the light source device 41, the optical component storage unit 912 that stores the optical components 42 to 45 including the optical device 45, the projection lens 46, and the projection position adjustment device 5. And a projection lens support 913, which are integrally formed. Among these, the optical component storage portion 912 is substantially the same as the configuration of the component storage member 472 described above, but unlike the component storage member 472, a fixing portion to which the optical device 45 is fixed is formed. That is, the component storage member 91 corresponds to the horizontal portion of the support body of the present invention.

The projection lens support portion 913 is formed to stand substantially vertically from the end of the optical component storage portion 912 on the light beam exit side. The projection lens support portion 913 has a substantially rectangular shape when viewed from the light beam exit side, and a substantially rectangular opening 9131 is formed at a substantially center.
On the surface 913A on the light beam exit side of the projection lens support portion 913, movement restricting portions 9132 and 9133 that protrude in the out-of-plane direction and extend in the horizontal direction are formed at ends corresponding to the upper and lower portions of the opening 9131. ing. These movement restricting units 9132 and 9133 define the movable range of the movable frame 51 of the projection position adjusting device 8.
Further, a guide 9134 for guiding the movement of the movable frame 51 in the vertical direction along the surface 913A protrudes in the out-of-plane direction at the position of the surface 913A corresponding to the left side of the opening 9131 when viewed from the light beam exit side. It is formed so as to extend in the vertical direction.

In addition, screw holes 9135 are formed at positions close to the center in the horizontal direction from the four corners of the surface 913A. A long screw 573 through which the pressing frame 82 is inserted is screwed into these screw holes 9135. As a result, the projection position adjusting device 8 is attached to the projection lens support portion 913.
Further, a projection 9136 that protrudes in two steps in the out-of-plane direction is formed at the upper left end when the surface 913A is viewed from the light beam exit side, and the pinion 54 is rotatably supported by the projection 9136. .

The projector having the projection position adjusting device 8 and the optical component housing 9 of the present embodiment as described above has the same effects as the projector 1 having the projection position adjusting device 5 shown in the first embodiment. In addition, the following effects can be achieved.
That is, the light source storage unit 911 that stores the light source device 41, the optical component storage unit 912 that supports and stores the optical device 45, and the projection lens support unit 913 that supports the projection lens 46 and the projection position adjustment device 8 are optical. It is integrally formed as a component storage member 91 of the component housing 9. According to this, the position adjustment between the optical device 45 and the projection lens 46 can be easily performed, and the error in the distance when the projection lens 46 and the projection position adjustment device 8 are attached can be suppressed. The mounting process of the lens 46 and the projection position adjusting device 8 can be simplified, and the mounting accuracy of these can be improved.
Further, since the number of parts constituting the projector can be reduced, the configuration can be simplified. Furthermore, since it is not necessary to separately provide a support body such as the above-described head bodies 48 and 49 in the optical component casing 9, the manufacturing process can be further simplified.

[5. Modification of 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, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

    In each of the above embodiments, the projection lenses 46, 46A, 46B are moved in the vertical direction by the projection position adjusting devices 5, 6, 7, 8, but the present invention is not limited to the vertical direction. That is, as long as the projection lenses 46, 46A, and 46B are moved in a direction substantially orthogonal to the projection direction of the projection lenses 46, 46A, and 46B, the movement direction is not limited. Moreover, in each said embodiment, although it was set as only the uniaxial direction of the up-down direction, you may comprise so that it may have a moving direction of 2 axes | shafts or more, for example, a horizontal direction.

  In the first, second, and fourth embodiments, the pressing frames 52 and 82 bias the projection lens 46 or the movable frame 61 to the head body 48 or the projection lens support portion 913 via the leaf spring 53 from the light beam exit side. In the third embodiment, the coil spring 572 biases the flange portion 46B2 of the projection lens 46B. However, the present invention is not limited to this. That is, any other configuration may be used as long as it generates biasing force and finally biases and supports the projection lenses 46, 46A, and 46B to the head body 48 or the projection lens support portion 913. For example, an elastic body such as rubber may be used.

  In the fourth embodiment, the projection position adjusting device 8 including the movable frame 51 located on the light beam incident side of the flange portion 462 formed in the projection lens 46 is employed, but the present invention is not limited to this. That is, the configuration of the projection position adjustment devices 6 and 7 may be adopted instead of the projection position adjustment device 8 by changing the configuration of the projection lens support portion 913 formed in the optical component housing 9.

In each of the above embodiments, 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.
Further, in each of the above embodiments, the transmissive liquid crystal panel 451 having a different light beam incident surface and light beam emission surface is used. However, a reflection type liquid crystal panel having the same light incident surface and light emission surface is used. Also good.
Further, in each of the above embodiments, only the example of the projector 1 using the three liquid crystal panels 451 (451R, 451G, 451B) is given, but the projector using two or four or more liquid crystal panels is also given. Applicable.

  In each of the above embodiments, the projector 1 including the liquid crystal panel as the light modulation device is illustrated. However, any other light modulation device that modulates the incident light beam according to image information to form an optical image may be used. Good. For example, the present invention can be applied to a projector using a light modulation device other than the liquid crystal layer, such as a device using a micromirror. In this case, the polarizing plates on the light incident side and the light emitting side can be omitted.

  In each of the above embodiments, only an example of a front type projector that projects an image from the direction of observing the screen is given. However, the present invention is a rear type projector that projects an image from the side opposite to the direction of observing the screen. It is also applicable to.

  The present invention includes an optical device having a light modulation device and a color synthesis optical device, and a projection optical device that enlarges and projects an optical image formed by the optical device, and a projection that moves an optical image projection position by the projection optical device. The present invention can be suitably used for a projector including a position adjustment device.

1 is a schematic perspective view showing a projector according to a first embodiment of the invention. The schematic diagram which shows the optical system of the optical unit in the said embodiment. The figure which shows the head body and projection position adjustment apparatus in the said embodiment. The figure which shows the head body and projection position adjustment apparatus which concern on 2nd Embodiment of this invention. The figure which shows the head body and projection position adjustment apparatus which concern on 3rd Embodiment of this invention. The figure which shows the housing | casing for optical components which concerns on 4th Embodiment of this invention, and a projection position adjustment apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 5, 6, 7, 8 ... Projection position adjustment apparatus, 9 ... Optical component housing, 41 ... Light source device (light source), 45 ... Optical device, 46, 46A, 46B ... Projection lens (projection optical device) , 48, 49... Head body (support body), 51, 61... Movable frame (moving member), 52, 82... Pressing frame (pressing member), 57. Support), 451 (451R, 451G, 451B) ... liquid crystal panel (light modulation device), 454 ... cross dichroic prism (color synthesis optical device), 461, 46A1, 46B1 ... barrel, 462, 46A2, 46B2 ... flange , 46A6, 46B5 ... abutment surface, 481, 491 ... horizontal part, 482, 492 ... vertical part, 912 ... optical component storage part (horizontal part), 913 ... projection lens support part (vertical part) .

Claims (5)

An optical apparatus comprising: a plurality of light modulation devices that modulate light beams emitted from a light source according to image information; and a color combining optical device that combines the light beams emitted from the plurality of light modulation devices to form an optical image. A projection optical device for enlarging and projecting the optical image, and a projection position adjusting device for moving the projection optical device in a plane substantially orthogonal to the projection direction to move the projection position of the light beam emitted from the projection optical device And a projector that supports the projection position adjusting device,
The support includes a horizontal portion that fixes the optical device, and a vertical portion that is substantially orthogonal to the horizontal portion,
The projection position adjusting device is
A moving member connected to the projection optical device, moving along a plane substantially parallel to the vertical portion of the support, and moving the projection optical device in a plane substantially orthogonal to the projection direction;
A projector comprising: a pressing member that biases and supports at least one of the moving member and the projection optical device with respect to a surface of the vertical portion. The projector according to claim 1, wherein
The projection optical device has a lens barrel and a flange portion protruding from the outer peripheral surface of the lens barrel,
The projector according to claim 1, wherein a contact surface that is in contact with the vertical portion is provided on a light beam incident side surface or a light beam emission side surface of the flange portion. The projector according to claim 2,
The projector according to claim 1, wherein the moving member and the flange portion are integrally formed. The projector according to any one of claims 1 to 3,
The projector according to claim 1, wherein the horizontal portion and the vertical portion are integrally formed. The projector according to any one of claims 1 to 4,
A plurality of optical components that optically convert a light beam incident from the light source, and an illumination optical axis of the light beam emitted from the light source is set inside, and the plurality of optical components are accommodated to a predetermined position on the illumination optical axis. And an optical component casing to be disposed on
The projector according to claim 1, wherein the support and the optical component casing are integrally formed.

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