JP2010091645A - Adjusting mechanism and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adjusting mechanism capable of adjusting an angle of an optical element while suppressing problems generating on fastening a screw, and capable of suppressing a shift in the angle after adjustment, and to provide a projector. <P>SOLUTION: The angle adjusting mechanism 800 (adjusting mechanism) includes: a first frame 820 housing an incident side polarizing plate 442; a protruding part 814 and a first hole 824 journaling the first frame 820 to a base frame 810 around a rotation axis K1; a first receptacle 826 rotating the first frame 820 with respect to the base frame 810; a suppression assist member 840 of a rotation suppressing part, the member 840 having a fixing part (a guide piece 843 and a suppression screw guide hole 842) to fix the suppression assist member 840 to the base frame 810 and an assist part (a pressing part 841) assisting suppression of the movement of the first frame 820 with respect to the base frame 810; and a suppressing member (a suppressing screw 850) of the rotation suppressing part, the member suppressing rotation of the first frame 820 with respect to the base frame 810, via the pressing part 841 of the suppression assist member 840. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an adjustment mechanism for adjusting an attachment angle of an optical element, and a projector including the adjustment mechanism.

  2. Description of the Related Art Conventionally, a projector that modulates a light beam emitted from a light source based on an image signal to form an optical image, and projects the formed optical image onto a projection target surface such as a screen via a projection lens or the like. Are known. Projectors are widely used for presentations at conferences, exhibitions, etc., and for movies at home. Such projectors are required to have high contrast and high brightness in order to realize easy viewing and cleanness with respect to the quality of the projected image, when used in any of the above-described applications.

  Therefore, in a projector using polarized light, the polarization direction of light is controlled with high accuracy. Specifically, the angle between the polarization axes of the incident-side polarizing plate and the exit-side polarizing plate arranged so as to sandwich the electro-optical device (for example, a liquid crystal panel), and the incident-side polarizing plate and the exit-side polarizing plate, respectively. The angle of the polarization axis or the angle of the optical axis of the phase difference plate (wave plate) corresponds to the layer thickness and orientation of the electro-optic material (eg liquid crystal) of the electro-optic device (eg liquid crystal panel). Adjustment to the angle is performed.

  In Patent Document 1, in order to obtain the best contrast and high brightness by finely adjusting the angles of the optical elements such as the incident side polarizing plate and the exit side polarizing plate, the first frame body has the optical elements. It is disclosed that an angle adjustment mechanism is provided that pivotally supports two frames and the second frame can be appropriately rotated by an adjustment member.

JP 2000-259093 A

According to Patent Document 1, a screw is used as the adjustment member. Therefore, when adjusting the angle of the polarization axis of the optical element, it is necessary to adjust the angle in consideration of backlash, and there is a problem in that the efficiency of the angle adjustment work is reduced. In addition, when an impact is applied to the angle adjustment mechanism after angle adjustment, there is a problem that the adjusted angle is likely to shift, and it is also possible to apply and fix an adhesive on the screw tightening portion after adjustment. It was. In addition, when adjusting the polarization axis or the like by screw tightening, the rotational moment generated by screw tightening has also caused the adjustment plate to be distorted.
Therefore, there has been a demand for an adjustment mechanism that can control the angle of the optical element by suppressing problems (such as the effects of backlash and rotational moment) that occur with the screw tightening, and suppress the deviation of the angle after the adjustment. .

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

  Application Example 1 An adjustment mechanism according to this application example is an adjustment mechanism that adjusts an attachment angle of an optical element. The adjustment mechanism includes a base frame, an accommodation frame that accommodates the optical element, and an optical system that includes the optical element. A pivot shaft set substantially parallel to the illumination optical axis, formed on the base frame body and the housing frame body around the pivot shaft, and a shaft support portion that pivotally supports the housing frame body on the base frame body; An adjustment unit that is formed in the housing frame and rotates the housing frame relative to the base frame by the pivot support, a suppression auxiliary member that assists in suppressing the operation of the housing frame relative to the base frame, and a suppression And a rotation suppression unit having a suppression member that suppresses the rotation of the housing frame relative to the base frame via the auxiliary part of the auxiliary member.

  According to such a configuration, the adjusting mechanism rotates the housing frame relative to the base frame around the rotation axis by the adjusting unit. In this way, by adjusting the mounting angle of the optical element (hereinafter, angle adjustment of the optical element) by rotating the optical element housed in the housing frame body by rotating the housing frame body with respect to the base frame body. Can be performed). Further, the adjustment mechanism fixes the angled storage frame body to the base frame body via the suppression assisting member by the suppression member of the rotation suppression unit, thereby rotating the storage frame body with respect to the base frame body. Suppress.

  As described above, when adjusting the angle of the optical element, since the adjustment unit is used, a conventionally used screw is not used. Therefore, the influence of backlash or the like can be eliminated when adjusting the angle of the optical element. Moreover, the suppression auxiliary member is fixed to the base frame, and the suppression member fixes the housing frame to the base frame. As a result, when the restraining member fixes the housing frame whose angle has been adjusted to the base frame via the restraining auxiliary member, the restraining assisting member is secured to the base frame and the restraining assisting member is prevented from moving. Therefore, it is reduced that the influence (for example, the influence of the conventional rotational moment and the influence of the backlash) due to the operation of the restraining member is transmitted to the housing frame via the restraining auxiliary member. With such a restraining member, the housing frame after the angle adjustment can be reliably fixed to the base frame body via the restraining auxiliary member, and the rotation of the housing frame body with respect to the base frame body is suppressed. . Therefore, the adjustment mechanism described above can reduce the influence of backlash and rotational moment to adjust the angle of the optical element, and can also reduce the deviation of the angle after adjustment.

  Application Example 2 In the adjustment mechanism according to the application example described above, the shaft support portion formed on the base frame body has a protruding portion that protrudes around the rotation shaft, and the shaft support portion formed on the housing frame body is: Preferably, the base frame body has a hole centered around the rotation shaft, and the base frame body pivotally supports the housing frame body by fitting the protrusion and the hole.

  According to such a configuration, the shaft support portion formed on the base frame body has the protruding projection portion, so that the hole portion of the shaft support portion formed on the housing frame body is fitted to the projection portion, It is pivotally supported around the pivot axis. Accordingly, the same effects as described above can be achieved, and the housing frame can be reliably pivoted and rotated with respect to the base frame with a simple configuration.

  Application Example 3 In the adjustment mechanism according to the application example described above, the suppression assisting member engages with the protrusion and guides the suppression assisting member, the suppression assisting member guide that guides the suppression member, It is preferable to have.

  According to such a configuration, the suppression assisting member is configured to include the suppression assisting member guide portion and the suppression member guide portion. The suppression assisting member guide portion engages with the protrusion to guide the suppression assisting member itself, and the suppression member guiding portion guides the suppression member so that the suppression assisting member is installed and suppressed by the suppression member. The auxiliary member is fixed to the base frame. With this configuration, the same effect as described above can be achieved, and the fixing portion of the suppression assisting member can be installed in the region of the protrusion or the suppression member. Since it is not necessary to install in the area | region of the base frame which is not influenced by rotation of a body, and the suppression auxiliary member can be arranged efficiently, a compact adjustment mechanism can be realized.

  Application Example 4 In the adjustment mechanism according to the application example described above, it is preferable that the suppression member is constituted by a screw, and the screw is screwed with a screwing portion formed on the base frame body via the suppression auxiliary member. .

  According to such a configuration, a conventional configuration and a simple method in which a screw is used as a restraining member and a screwed portion of the base frame body are used, and a conventional method is used with respect to the housing frame body in which the angle is adjusted. It is possible to reduce the influence of screws and securely fix the base frame.

  Application Example 5 In the adjustment mechanism according to the application example described above, the base frame body supports the housing frame body on at least one of the front side and the rear side of the base frame body in a direction along the illumination optical axis. Is preferred.

  According to such a configuration, the base frame body supports the housing frame body on the front side of the base frame body in the direction along the illumination optical axis, or pivots the housing frame body on the rear side of the base frame body. The receiving frame is supported, or the receiving frame is supported on both the front and rear sides of the base frame. Therefore, the side on which the housing frame is pivotally supported can be appropriately determined in optical design. In particular, angle adjustment can be performed on each of the plurality of optical elements by pivotally supporting the housing frame on both sides (front side, rear side) of the base frame.

  Application Example 6 In the adjustment mechanism according to the application example described above, when the base frame supports the housing frame on the front side and the rear side of the base frame in the direction along the illumination optical axis, each rotation The axis is preferably set substantially symmetrically with respect to a vertical plane passing through the illumination optical axis.

  According to such a configuration, the shape of the housing frame that is pivotally supported on the front side and the rear side of the base frame can be designed as substantially the same shape, so that the design efficiency can be improved.

  Application Example 7 In the adjustment mechanism according to the application example described above, it is preferable that a holding member that holds and holds the base frame body and the housing frame body is preferably provided.

  According to such a configuration, the base frame and the housing frame can be fixed so as not to be separated by holding and holding the base frame and the housing frame by the holding member.

  Application Example 8 In the adjustment mechanism according to the application example, it is preferable that the holding member is configured by a spring member.

  According to such a configuration, the housing frame can be held and held by the base frame with a simple configuration called a spring member.

  Application Example 9 A projector according to this application example includes a light source, an electro-optical device that modulates a light beam emitted from the light source based on an image signal to form an optical image, and any of the adjustment mechanisms described above. It is characterized by providing.

  According to such a configuration, the projector exhibits the effect of the adjustment mechanism described above. In addition, by adjusting the angle of the optical element by the adjustment mechanism, for example, the angle of the polarization axis or the optical axis of the optical element can be optimally adjusted, so that an optical image to be projected has high contrast and high brightness. An optical image. In addition, the adjustment mechanism can reduce the angle deviation even after adjustment, so that stable quality can be maintained.

  Application Example 10 In the projector according to the application example described above, the base frame included in the adjustment mechanism is fixed to an optical housing that houses an optical element installed on the light source side as compared with the optical element that adjusts the mounting angle. It is preferable.

  According to such a configuration, by fixing the base frame body serving as a reference of the adjustment mechanism to the optical housing, the optical element housed in the optical housing and the optical element adjusted by the adjustment mechanism are integrated. It can be handled as a component (unit), and the angle can be adjusted efficiently by using this unit during actual angle adjustment. In addition, when this unit whose angle has been adjusted is incorporated into the exterior case of the projector, it can be easily incorporated because it is integrated.

Hereinafter, embodiments will be described with reference to the drawings.
(Embodiment)

FIG. 1 is a schematic perspective view of a projector according to an embodiment of the present invention as viewed from the upper surface side. FIG. 2 is a schematic perspective view seen from the lower surface side of the projector.
The overall configuration of the projector 1 will be described with reference to FIGS. In addition, in order to assist description of this embodiment, the coordinate system is illustrated in subsequent drawings. The coordinate system is a direction from the rear direction to the front direction of the projector 1 with the X-axis direction as viewed from the front surface where the projection lens 3 of the projector 1 is installed, and from the left direction to the right direction. Is the Y-axis direction, and the direction from the lower direction to the upper direction is the Z-axis direction.

  The projector 1 separates a light beam emitted from a light source lamp as a light source into three primary colors of red (R), green (G), and blue (B), and images these color light beams through a liquid crystal panel constituting an electro-optical device. The modulated light beam of each color light after modulation based on the signal is synthesized by the color synthesis optical system, and is enlarged and displayed on the projection target surface (for example, a screen) via the projection lens 3. Except for a part of the projection lens 3, each component is housed in the exterior case 2.

The structure of the outer case 2 will be described with reference to FIGS.
The outer case 2 covers the upper surface of the projector 1 and also covers the upper case 21 that covers the upper half of the side surface, the rear surface, and the front surface, the bottom surface of the projector 1, and the lower half of the side surface, the rear surface, and the front surface. And a lower case 22. The outer case 2 is made of synthetic resin.

  As shown in FIG. 1, a power switch 27 for performing projection ON / OFF operation is installed at the center of the upper surface of the exterior case 2 (upper case 21) on the rear side (the opposite side to the projection lens 3). Yes. A source search switch 28 is installed behind the power switch 27 to detect the source input to the projector 1 and, if detected, switch to that source. Further, an indicator lamp 29 that displays the operating state of the projector 1 is installed behind the source search switch 28. A remote control light receiving unit 213 for receiving a signal from a remote controller (not shown) is installed from the rear of the indicator lamp 29 to the upper part of the back surface.

  In addition, a projection lens position adjustment unit 30 that adjusts the left and right position and the vertical position of the projection lens 3 is formed on the front side (projection lens 3 side) of the upper case 21 at the left and right parts with the projection lens 3 as the center. The two dials 301 and 302 to be exposed are installed. Then, by rotating one dial 301, the projection lens 3 can be moved up and down. Further, the projection lens 3 can be moved left and right by rotating the other dial 302. In the center of the upper surface of the upper case 21, a light source device replacement lid 212 that is opened when the light source device is replaced is installed. By attaching / detaching the light source device replacement lid 212 from the upper surface of the upper case 21, it becomes possible to replace the internal light source device (not shown).

  A projection lens 3 for enlarging and projecting the modulated light beam is attached to the right side of the front surface of the outer case 2. A remote control light receiving unit 213 that receives a signal from a remote controller (not shown) is installed in the outer case 2 (lower case 22) on the right side of the projection lens 3. In addition, a duct 214 for exhausting warm air inside the projector 1 to the outside of the projector 1 is installed in the outer case 2 on the left side of the projection lens 3. An operation panel (not shown) for adjusting image quality and the like is installed on the right side surface of the outer case 2.

  As shown in FIG. 2, an air intake 221 for taking in cooling air for cooling the inside of the projector 1 is installed on the back surface of the exterior case 2 (lower case 22). Various input / output terminal groups 25 are installed above the air intake port 221. Next to the air intake port 221, an AC inlet 24 for supplying external power and a main power switch 26 for performing ON / OFF operation of the main power source are installed.

  Three legs 222 are installed on the bottom surface of the lower case 22, adjustment legs 222R and 222L are installed on the left and right corners which are front side ends, and fixed legs are provided at substantially the center of the rear side ends. 222C is installed. It is possible to change the tilt of the display screen by adjusting the vertical movement amounts of the adjustment legs 222R and 222L.

FIG. 3 is a perspective view showing the internal structure of the projector. Specifically, a state in which the upper case 21 and the like are removed from the projector 1 in the state shown in FIG.
The internal structure of the projector 1 will be described with reference to FIG.

  In the exterior case 2, the main body of the projector 1 is accommodated. An optical unit 4 having a substantially L-shaped plane extending in the left-right direction inside and having one end extending forward, a control board (not shown) installed above the optical unit 4, and a left side of the lower case 22 A power supply unit 5 installed from the back side to the front side along the inside is provided.

  And the cooling unit 7 installed along the inner side of the lower case 22 on the back side of the optical unit 4 is provided. The cooling unit 7 draws outside air from the air intake port 221 and discharges it to the optical unit 4 and the power supply unit 5. Then, the cooling unit 7 cools the air, to which the heat generated by the optical unit 4 or the power supply unit 5 has been transferred, to the outside of the projector 1 through the duct 214 and cools it.

The configuration and operation of the power supply unit 5 will be described with reference to FIG.
The power supply unit 5 supplies power to the light source device 411 (see FIG. 4), a control board, and the like, and includes a power supply block 50 including a power supply circuit and a lamp driving block 51 as shown in FIG. ing.

  The power supply block 50 supplies electric power supplied from the outside through a power supply cable (not shown) connected to the AC inlet 24 to the lamp drive block 51 that drives the light source device 411 and the control board. The power supply block 50 includes a circuit board on which a transformer that converts an input alternating current into a constant voltage direct current, a conversion circuit that converts an output from the transformer into a predetermined voltage, and the like are mounted.

  The lamp drive block 51 includes a circuit board on which a conversion circuit for supplying power to the light source device 411 with a stable voltage is mounted. The commercial AC current input from the power supply block 50 is converted by the lamp drive block 51. It is converted into a direct current or an alternating rectangular wave current and supplied to the light source device 411.

The configuration and operation of the control board (not shown) will be described.
The control board includes a main board (not shown) arranged above the optical unit 4 and a sub board (not shown) arranged between the main board and the light source housing 452.

  The main board is configured as a circuit board on which an arithmetic processing device such as a CPU (Central Processing Unit) is mounted, and controls the overall operation of the projector 1. The main board drives each liquid crystal panel 441R, 441G, 441B (see FIG. 4) as an electro-optical device to be described later based on a signal output from an interface board (not shown) on which the input / output terminal group 25 is mounted. Control. Each of the liquid crystal panels 441R, 441G, and 441B performs optical modulation to form an optical image. The interface board is a circuit board that processes input / output signals from the input / output terminal group 25. Further, the main board receives an operation signal input from the operation panel or the remote control light receiving unit 213, and appropriately outputs a control signal to the components of the projector 1 based on the operation signal.

  The sub board is a board on which a fan drive circuit for driving a plurality of cooling fans (not shown) constituting the cooling unit 7 is mounted, and is electrically connected to the main board and is output from the main board. The cooling fan is driven by inputting a signal.

FIG. 4 is a diagram schematically showing an optical system of the optical unit.
The configuration of the optical unit 4 will be described with reference to FIGS.
The optical unit 4 modulates the light beam emitted from the light source device 411 according to image information to form an optical image, and forms a projected image on the screen via the projection lens 3. As shown in FIG. 4, the optical system of the optical unit 4 includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an electro-optical device, and a color synthesis optical system. . The electro-optical device and the color synthesis optical system are configured as an integrated optical device 44.

  The optical unit 4 includes an optical housing 45 that accommodates and fixes the optical components constituting the optical systems 41, 42, and 43. Specifically, the optical housing 45 includes an optical component storage unit 451 that guides and stores the optical components that constitute the optical systems 41, 42, and 43, and a light source storage unit that guides and stores the light source device 411. 452. The optical housing 45 includes an upper housing housing 45A and a lower housing housing 45B. The optical components corresponding to the optical component housing portion 451 and the light source housing portion 452 are the same as the upper housing housing 45A. It is housed in a form sandwiched from above and below by the lower housing 45B. Then, the upper housing case 45A and the lower housing case 45B are unitized by screws, and are fixed to the lower case 22 side by fixing screws.

  The optical components constituting the electro-optical device and the color synthesis optical system are housed and fixed in a fixed frame 48 provided separately from the optical housing 45. The fixed frame body 48 has a substantially L-shaped side surface and is formed of a magnesium alloy integrally formed product. The optical device 44 is accommodated in the fixed frame 48, and the projection lens 3 is accommodated and fixed on the opposite side. In addition, the fixed frame 48 is provided with mechanical parts constituting the projection lens position adjusting unit 30 (including the dials 301 and 302) for adjusting the vertical and horizontal positions of the projection lens 3 described above on the outer periphery of the projection lens 3. It is housed and fixed. Further, the fixed frame 48 has a structure for guiding and fixing the optical housing 45 described above. The fixed frame 48 is fixed to the lower case 22 with a fixing screw.

The configuration and operation of the optical system will be described with reference to FIG.
As shown in FIG. 4, the integrator illumination optical system 41 is an optical system for making the luminous flux emitted from the light source uniform in the plane perpendicular to the illumination optical axis L. 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 contains a light source lamp 411A as a radiation light source, a reflector 411B, an explosion-proof glass 411C that covers the light-emitting surface of the reflector 411B, and a light source housing that houses and fixes the light source lamp 411A, the reflector 411B, and the explosion-proof glass 411C. A body 411D is provided. Then, the radial light beam emitted from the light source lamp 411A is reflected by the reflector 411B to be a substantially parallel light beam, and is emitted to the outside. In the present embodiment, a high-pressure mercury lamp is used as the light source lamp 411A, and a parabolic mirror is used as the reflector 411B. The light source lamp 411A is not limited to a high-pressure mercury lamp, and for example, a metal halide lamp or a halogen lamp may be employed. Moreover, although the parabolic mirror is employ | adopted as the reflector 411B, you may employ | adopt the structure which has arrange | positioned the collimating concave lens not only to this but to the output surface of the reflector which consists of an ellipsoidal mirror.

  The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline when viewed from the illumination optical axis L direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source lamp 411A into partial light beams and emits them in the direction of the illumination optical axis. 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 an electro-optical device (liquid crystal panel 441) described later of the optical device 44.

  The polarization conversion element 414 converts the light from the second lens array 413 into approximately one type of polarized light, thereby increasing the light use efficiency in the optical device 44. Specifically, each partial light beam converted into substantially one type of polarized light by the polarization conversion element 414 is finally substantially superimposed on a liquid crystal panel 441 (to be described later) of the optical device 44 by the superimposing lens 415.

  The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423. A plurality of partial light beams emitted from the integrator illumination optical system 41 are separated into three color lights of red (R), green (G), and blue (B) by two dichroic mirrors 421 and 422.

  The relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 435. The relay optical system 43 has a function of guiding the blue light, which is the color light separated by the color separation optical system 42, to a blue light liquid crystal panel 441 described later of the optical device 44.

  Note that the dichroic mirror 421 of the color separation optical system 42 transmits the green light component and the blue light component and reflects the red light component of the light beam emitted from the integrator illumination optical system 41. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 419, and reaches the liquid crystal panel 441 for red light. The field lens 419 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 419 provided on the light incident side of the liquid crystal panel 441 for blue light and green 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 419, and reaches the liquid crystal panel 441 for green light. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 419, and reaches the liquid crystal panel 441 for blue light.

  The reason why the relay optical system 43 is used for blue light is that the optical path length of the blue light is longer than the optical path lengths of the other color lights, so that the use efficiency of the light due to light divergence is prevented. It is. That is, this is because the partial light beam incident on the incident side lens 431 is transmitted to the field lens 419 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 optical device 44 modulates the incident light beam based on the image signal to form a color image. The optical device 44 includes three incident side polarizing plates 442 (optical light incident side polarizing plate 442R for red light and green light for optical light) as optical elements on which the respective color lights separated by the color separation optical system 42 are incident. A green light incident side polarizing plate 442G, and a blue light incident side polarizing plate 442B). In addition, three liquid crystal panels 441 as electro-optical devices installed at the subsequent stage of each incident-side polarizing plate 442 (red light liquid crystal panel 441R, green light liquid crystal panel 441G, and blue light liquid crystal panel 441G and blue light) A liquid crystal panel for blue light 441B). Also, there are three emission side polarizing plates 443 (red light emitting side polarizing plate 443R for red light, green light emitting side polarizing plate 443G, and green light emitting side polarizing plate 443G) installed at the rear stage of each liquid crystal panel 441. A blue light exit side polarizing plate 443B) and a cross dichroic prism 445 as one color synthesis optical system.

  The optical device 44 in this embodiment includes a retardation plate 444 between the incident-side polarizing plate 442 and the liquid crystal panel 441 on the optical path of each color light, and corrects the polarized light beam emitted from the incident-side polarizing plate 442. is doing. Here, the phase plate 444R for red light is the phase plate 444R, the phase plate 444 for green light is the phase plate 444G, and the phase plate 444 for blue light is the phase plate 444B.

  The liquid crystal panel 441 (441R, 441G, 441B) uses, for example, a polysilicon TFT (Thin Film Transistor) as a switching element, and the liquid crystal is hermetically sealed in a pair of opposed transparent substrates. The liquid crystal panel 441 modulates and emits a light beam incident through the incident-side polarizing plate 442 based on an image signal.

  The incident-side polarizing plate 442 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 exit side polarizing plate 443 is also configured in substantially the same manner as the incident side polarizing plate 442, 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. The polarization axis of the polarized light to be transmitted is set to be orthogonal to the polarization axis of the polarized light to be transmitted by the incident side polarizing plate 442.

  The cross dichroic prism 445 forms a color image by synthesizing optical images emitted from the emission-side polarizing plate 443 and modulated for each color light. The cross dichroic prism 445 is provided with a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the body multilayer film. The color light synthesized by the cross dichroic prism 445 is emitted in the direction of the projection lens 3. The video light emitted from the cross dichroic prism 445 is enlarged as a color image by the projection lens 3 and projected onto the screen.

  The liquid crystal panel 441 (441R, 441G, 441B) and the exit side polarizing plate 443 (443R, 443G, 443B) described above are fixed to the cross dichroic prism 445 via a fixing member to constitute the optical device 44. The optical device 44 (the liquid crystal panel 441, the emission-side polarizing plate 443, and the cross dichroic prism 445) has a structure that is fixed to the fixed frame 48 described above. The incident side polarizing plate 442 and the phase difference plate 444 included in the optical device 44 are fixed to the optical component housing portion 451 side described above.

FIG. 5 is a schematic perspective view showing the adjustment mechanism. FIG. 6 is an exploded perspective view of the adjustment mechanism. FIG. 6 is an exploded perspective view showing only the green light adjusting mechanism for convenience of explanation.
With reference to FIG. 3 to FIG. 6, the configuration of an angle adjustment mechanism 800 as an adjustment mechanism for the incident-side polarizing plate 442 and the phase difference plate 444 will be described.

  As shown in FIGS. 3, 4, and 5, one angle adjusting mechanism 800 is provided for each color light. Further, the angle adjusting mechanism 800 is provided on the light beam incident side of each of the liquid crystal panels 441R, 441G, 441B.

  As shown in FIGS. 5 and 6, the angle adjustment mechanism 800 in this embodiment includes a mechanism for finely adjusting the polarization axis angles of the incident-side polarizing plates 442 (442R, 442G, 442B), and a phase difference plate 444 ( 444R, 444G, and 444B), and a mechanism for adjusting the angles of the two optical elements, respectively, and a mechanism for finely adjusting the optical axis angles.

  The angle adjustment mechanism 800 includes a base frame body 810, and a first frame body 820 and a second frame body 830 as storage frames. Incident-side polarizing plates 442R, 442G, and 442B are attached to the first frame 820, and retardation plates 444R, 444G, and 444B are attached to the second frame 830. As a general configuration of the angle adjustment mechanism 800, a first frame 820 in which an incident-side polarizing plate 442 is attached to a light beam incident side (field lens 419 side) of the base frame 810 with the base frame 810 as a reference will be described later. The second frame body 830 that is pivotally supported by the shaft support section and has the phase difference plate 444 attached to the light beam exit side (liquid crystal panel 441 side) of the base frame body 810 is similarly supported by the shaft support section. Further, the first frame 820 and the second frame 830 are formed in almost the same shape.

  The angle adjustment mechanism 800 is installed on the projections 814 (first projection 814A and second projection 814B), which are installed on the base frame 810, and on the first frame 820 and the second frame 830. A first hole portion 824 and a second hole portion 834 as shaft support portions. The angle adjustment mechanism 800 pivotally supports the first frame body 820 and the second frame body 830 with respect to the base frame body 810 by the pivot support portion.

  Further, the angle adjustment mechanism 800 includes a first receiving portion 826 and a second receiving portion 836 as receiving portions installed on the first frame body 820 and the second frame body 830. The first receiving part 826 and the second receiving part 836 constitute an adjusting part. The first receiving portion 826 and the second receiving portion 836 operate by transmitting the force of an angle adjusting jig (not shown) during angle adjustment, and the first frame 820 and the second receiving portion 836 are connected to the base frame 810. The rotation angle of the two-frame body 830 is adjusted.

  The first receiving portion 826 operates and adjusts the rotation angle (attachment angle) of the first frame 820 to change the polarization axis direction of the incident-side polarizing plates 442R, 442G, and 442B attached to the first frame 820. adjust. Further, the second receiving portion 836 operates to adjust the rotation angle (attachment angle) of the second frame body 830, thereby adjusting the optical axis direction of the phase difference plates 444R, 444G, and 444B attached to the second frame body 830. Adjust.

  Here, adjusting the rotation angle of the first frame body 820 or the second frame body 830 is attached to the incident side polarizing plate 442 or the second frame body 830 attached to the first frame body 820. This is the same as adjusting the mounting angle of the phase difference plate 444. In the following description, adjusting the rotation angle is appropriately referred to as angle adjustment. Further, adjusting the angle means adjusting the polarization axis direction and the optical axis direction of the incident-side polarizing plate 442 and the phase difference plate 444 attached to the first frame 820 and the second frame 830. Shall.

  The angle adjustment mechanism 800 includes a suppression auxiliary member 840 and a suppression screw 850 as a suppression member. The suppression auxiliary member 840 and the suppression screw 850 constitute a rotation suppression unit. The suppression assisting member 840 is fixed to the base frame 810, and the storage frame (first frame 820, second frame 830) is fixed to the base frame 810 with a suppression screw 850. Accordingly, the housing frame (first frame 820, second frame 830) is prevented from rotating with respect to the base frame 810.

  The angle adjustment mechanism 800 has a holding spring 860 as a holding member. The holding spring 860 sandwiches and holds the storage frame bodies (first frame body 820 and second frame body 830) on the base frame body 810, whereby the base frame body 810 and the storage frame body (first frame body 820). The second frame 830) is fixed so as not to be separated.

  The angle adjusting mechanism 800 according to the present embodiment is configured such that, for green light, the first frame body 820 to which the incident side polarizing plate 442G for green light is attached and the second retardation plate 444G for green light are attached. The angle of the frame body 830 is adjusted. For the blue light, similarly to the green light, the first frame 820 to which the blue light incident side polarizing plate 442B is attached and the second frame 830 to which the blue light retardation plate 444B is attached. Adjust the angle. The same applies to red light. As described above, one angle adjustment mechanism 800 is provided on each of the liquid crystal panels 441R, 441G, and 441B on the light beam incident side. In the angle adjustment mechanism 800, the base frame 810 is fixed to the upper housing 45A of the optical housing 45.

  As described above, each angle adjustment mechanism 800 installed corresponding to each color light has the same configuration. Therefore, hereinafter, a detailed configuration, an assembling method, and an operation of the angle adjusting mechanism 800 will be described focusing on the angle adjusting mechanism 800 attached to the light beam incident side of the green light liquid crystal panel 441G. Note that “upper”, “lower”, “left”, and “right” described below are obtained by viewing the angle adjusting mechanism 800 installed for green light from the light emission side (viewed from the liquid crystal panel 441G side). In this case, “up”, “down”, “left”, and “right” are meant.

  The base frame body 810 is formed of a metal plate material. As shown in FIG. 6, the base frame body 810 has a base frame body 811 that is substantially rectangular and is disposed so as to be substantially perpendicular to the illumination optical axis L. The base frame body 811 has a substantially rectangular opening 812 at the center. The opening 812 opens in a form in which the lower end of the base frame body 811 is cut out. The base frame body 810 has a base frame fixing portion 813 that is bent and extended substantially vertically from the center of the upper end portion of the base frame body 811 to the light beam incident side. The base frame fixing portion 813 is formed with holes 813A, 813B, and 813C for fixing the base frame body 810 itself to a base frame body receiving portion 453 of the upper housing 45A described later.

  The base frame body 810 is a right corner portion at the upper end of the base frame body 811 and has a rotation axis K1 set substantially parallel to the illumination optical axis L, and is formed around the rotation axis K1. It has a protrusion 814 (first protrusion 814A) as a shaft support. The first protrusion 814A is formed in a cylindrical shape and protrudes toward the light incident side. The first protrusion 814A is formed by burring, for example. Further, a screw hole 815 (first screw hole 815A) as a screwing portion for screwing with a restraining screw 850 as a restraining member to be described later is provided at a further right corner portion of the first protrusion 814A. . The first screw hole 815A is formed in a cylindrical shape and slightly protrudes toward the light beam incident side. For example, the first screw hole 815A is formed by performing screw hole processing in accordance with the screw pitch of the restraining screw 850 in addition to burring.

  Further, the base frame body 810 has a locking portion 816 (816A) for locking a holding spring 860 as a holding member at the upper part of the left end portion of the base frame main body 811. The locking portion 816A is formed by cutting and raising, for example, cut and raised on the light beam exit side, and protrudes in a substantially triangular shape in cross section. Similarly, the base frame body 810 has a locking portion 816 (816B) for locking a holding spring 860 as a holding member on the right side of the lower end portion of the base frame body 811. This locking portion 816B is also formed in the same manner as the locking portion 816A.

  The first protrusion 814A, the first screw hole 815A, and the locking portions 816A and 816B described above are components used to pivotally support and hold the first frame 820. The base frame 810 is similarly formed with components used for pivotally supporting and holding the second frame 830. Specifically, the first protrusion 814A, the first screw hole 815A, and the locking portions 816A and 816B are rotated approximately 180 degrees around a central axis (not shown) that bisects the base frame body 811 to the left and right. It is formed in a state.

  The projecting portion, the screw hole, and the locking portion configured in this manner are referred to as a second projecting portion 814B, a second screw hole 815B, and locking portions 816C and 816D, respectively. Therefore, the second protrusion 814B, the second screw hole 815B, and the locking portions 816C and 816D are based on the central axis (not shown), and the first protrusion 814A, the first screw hole 815A, and the locking portion. 816A and 816B are formed at symmetrical portions. The second protrusion 814B is formed so as to protrude toward the light beam emission side with a rotation axis K2 set substantially parallel to the illumination optical axis L of the base frame body 810 as a center. The second screw hole 815B also protrudes toward the light beam exit side. Further, the locking portions 816C and 816D are cut and raised on the light beam incident side. The second protrusion 814B, the second screw hole 815B, and the locking portions 816C and 816D formed in this way are components used to pivotally support and hold the second frame 830. In other words, the rotation axes K1 and K2 set as described above are set substantially symmetrically with respect to a vertical (Z-axis direction) plane passing through the illumination optical axis L.

  The first frame 820 is formed of a metal plate material. As shown in FIG. 6, the first frame body 820 has a first frame body 821 that is substantially rectangular and is disposed so as to be substantially perpendicular to the illumination optical axis L. The central portion of the first frame body 821 has a substantially rectangular opening 822 in a region having a predetermined step with the first frame body 821 on the light beam incident side. On the right edge of the first frame body 821 around the opening 822, an upright portion 821A is formed over substantially the entire length, and an upright portion 821B is formed on the lower edge. A transparent glass substrate 880 with the incident-side polarizing plate 442G attached thereto is attached from the light emission side to the periphery of the opening 822 with reference to the standing portions 821A and 821B.

  Also, a holding piece 823 is formed on the right side of the upright portion 821B of the first frame main body 821 so as not to be stepped from the first frame main body 821 and extending downward. The first frame main body 821 has a first hole portion 824 as a shaft support portion at the right corner portion of the upper end portion. The first hole portion 824 is formed with a hole diameter that fits to the outer peripheral surface of the first protrusion 814 </ b> A as a shaft support portion of the base frame body 810. Further, a loose fitting portion 825 that loosely fits the cylindrical outer peripheral surface of the first screw hole 815 </ b> A as a screwing portion of the base frame body 810 is formed at the right-side corner portion of the first hole portion 824. The loose fitting portion 825 is formed in a long hole shape with the rotation axis K1 as a substantial center.

  Further, the first frame body 821 has a first receiving portion 826 as a receiving portion that extends upward from the left side of the upper end portion of the first frame body 821 and that is bent substantially perpendicularly to the light incident side. The 1st receiving part 826 comprises the adjustment part. Further, a substantially rectangular escape hole 827 is formed in a region extending to constitute the first receiving portion 826. The escape hole 827 includes a screw portion that protrudes from the surface on the light beam incident side of the base frame body 811 when the suppression screw 850 serving as a suppression member of the second frame 830 is screwed into the second screw hole 815B of the base frame 810. It is a part to escape the interference.

  The second frame 830 is formed in substantially the same manner as the first frame 820. The general configuration of the second frame 830 is formed in a state in which the first frame 820 is rotated approximately 180 degrees around a central axis (not shown) that bisects the first frame 820 left and right. . Specifically, the second frame 830 is formed of a metal plate material. As shown in FIG. 6, the second frame body 830 has a second frame body 831 that is substantially rectangular and is disposed so as to be substantially perpendicular to the illumination optical axis L. A central portion of the second frame body 831 has a substantially rectangular opening 832. A standing portion 831A is formed over the substantially entire length of the left and right edges of the second frame body 831 around the opening 832, and a standing portion 831B is formed at the lower central edge. A transparent glass substrate 890 with a retardation plate 444G attached thereto is attached from the light emission side to the periphery of the opening 832 with the upright portions 831A and 831B as a reference.

  Also, a holding piece 833 extending downward is formed on the left side of the upright portion 831B of the second frame body 831. The second frame body 831 has a second hole portion 834 as a shaft support portion at the left corner portion of the upper end portion. The second hole portion 834 is formed with a hole diameter that fits to the outer peripheral surface of the second protrusion portion 814 </ b> B as the shaft support portion of the base frame body 810. Further, a loose fitting portion 835 that loosely fits the cylindrical outer peripheral surface of the second screw hole 815 </ b> B as a screwing portion of the base frame body 810 is formed in the left corner portion of the second hole portion 834. The loose fitting portion 835 is formed in a long hole shape about the rotation axis K2.

  Further, the second frame body 831 has a second receiving portion 836 that extends upward from the right side of the upper end portion and has an end portion bent substantially perpendicularly to the light beam emission side. The 2nd receiving part 836 comprises the adjustment part. Further, a substantially rectangular escape hole 837 is formed in a region extended to constitute the second receiving portion 836. The escape hole 837 includes a screw portion that protrudes from the surface on the light beam exit side of the base frame body 811 when the suppression screw 850 serving as the suppression member of the first frame 820 is screwed into the first screw hole 815A of the base frame 810. It is a part to escape the interference.

  The suppression assisting member 840 is formed of a metal plate material. The suppression assisting member 840 has a substantially rectangular shape and has a pressing portion 841 as an assisting portion disposed so as to be substantially perpendicular to the illumination optical axis L. A suppression screw guide hole 842 as a suppression member guide portion that guides a suppression screw 850 as a suppression member is formed in the central portion of the pressing portion 841. The suppression screw guide hole 842 constitutes a fixing portion of the suppression auxiliary member 840.

  Further, a guide piece as a restraining auxiliary member guide portion that is bent and extended from one corner portion having a rectangular shape toward the outside in a diagonal direction so as to be substantially perpendicular to the pressing portion 841 with a predetermined width. 843 is formed. The guide piece 843 constitutes a fixed portion of the suppression auxiliary member 840 together with the suppression screw guide hole 842 described above. The suppression assisting member 840 guides the suppression assisting member 840 by engaging the guide piece 843 with the inner peripheral surfaces of the first protrusion 814A and the second protrusion 814B. Therefore, the predetermined width of the guide piece 843 is substantially the inside diameter of the first protrusion 814A and the second protrusion 814B.

  In addition, the suppression auxiliary member 840 and the suppression screw 850 are each used one by one in order to fix the first frame 820 to the base frame 810. Similarly, one second frame 830 is used to fix the second frame 830 to the base frame 810.

  Then, after adjusting the angle of the housing frame (first frame 820, second frame 830), the guide piece 843 is inserted into the inner peripheral surface of the protruding portion 814 of the base frame 810, and serves as a restraining member. By inserting the screw portion of the restraining screw 850 into the restraining screw guide hole 842 and screwing the restraining screw 850 with the screw hole 815 of the base frame body 810, the housing frame body is pressed against the base frame body 810 to receive the housing frame. Suppresses body rotation.

  The holding member includes a holding spring 860 as a spring member. The holding spring 860 is formed of a metal plate material. The holding spring 860 has a shape bent into a substantially U-shaped cross section. Also, a hole 861 that engages with the protruding portion of the locking portion 816 of the base frame 810 is formed on one surface. In this embodiment, two holding springs 860 are used to hold the first frame 820 between the base frame 810 and hold it. Similarly, two second frame bodies 830 are used to sandwich and hold the second frame body 830 between the base frame bodies 810.

  The base frame receiving part 453 is configured in the upper housing 45A. The base frame body receiving portion 453 is formed to project upward at the edge of the upper housing 45A located above the illumination optical axis L at a position upstream of the liquid crystal panel 441G. A fixing hole 454 for fixing the angle adjusting mechanism 800 (base frame body 810) with a screw is formed in the upper surface 453A of the base frame body receiving portion 453. In addition, guide protrusions 455 and 456 for positioning when fixing the angle adjusting mechanism 800 (base frame body 810) are formed on both sides of the fixing hole 454. The angle adjusting mechanism 800 is fixed to the upper housing 45A by screwing the fixing screw 870 into the fixing hole 454 and fixing it.

FIG. 7 is a perspective view showing a state in which the first frame is assembled to the base frame. FIG. 8 is a perspective view showing a state cut at the position AA in FIG. FIG. 9 is a perspective view illustrating a state in which the second frame is assembled to the base frame after the first frame is assembled to the base frame. FIG. 10 is a perspective view showing a state cut at the BB position in FIG. 9. FIG. 11 is a cross-sectional view along the illumination optical axis of the angle adjustment mechanism. 7 and 8 are perspective views seen from the light incident side. 9 and 10 are perspective views as seen from the light beam exit side. 8 and 10 are views in which the shaft support portion and the rotation suppressing portion are cut. FIG. 11 includes cross sections of the shaft support portion and the rotation suppression portion of the first frame body 820.
Based on the exploded perspective view shown in FIG. 6, the assembly method of the angle adjustment mechanism 800 is demonstrated with reference to FIGS.

  In general, the angle adjustment mechanism 800 is assembled by first attaching the first frame 820 to the base frame 810, then attaching the second frame 830 to the base frame 810, and finally attaching the first frame 820. And the second frame body 830 are attached to a base frame body receiving portion 453 formed in the upper housing 45A.

First, the first frame 820 is attached to the base frame 810.
Prior to this, first, as shown in FIG. 7, FIG. 8, and FIG. 11, the glass substrate 880 with the incident side polarizing plate 442G attached to the first frame body 820 is attached to the upright portions 821A and 821B. As a reference, it is attached to the periphery of the opening 822 from the light emission side. The glass substrate 880 is fixed to the first frame body 821 with a heat conductive double-sided tape, an adhesive, or the like.

  Next, as shown in FIG. 8, the first frame 820 is fixed to the base frame 810. More specifically, the first protrusion 814A of the base frame 810 is inserted into and fitted into the first hole 824 of the first frame 820, and the surface of the first frame main body 821 on the light beam emission side is fitted to the base frame main body 811. On the surface of the light beam incident side. As a result, the base frame 810 pivotally supports the first frame 820 around the rotation axis K1.

  Next, the first frame body 820 and the base frame body 810 are sandwiched and fixed using the holding spring 860. Specifically, after overlapping the first frame 820 and the base frame 810 as described above, the first frame 820 and the base frame 810 corresponding to the locking portions 816A and 816B of the base frame 810 are formed. The holding spring 860 is slid so as to be pinched from the end. Then, the hole 861 of the holding spring 860 is locked to the cut and raised portions of the locking portions 816A and 816B. At this time, as shown in FIGS. 8 and 11, the first screw hole 815 </ b> A formed in the protruding shape of the base frame body 810 is inserted into the loosely fitting portion 825 of the first frame body 820.

  When the first frame 820 is attached to the base frame 810, as shown in FIG. 11, the surface on the light beam exit side of the incident side polarizing plate 442G is lower than the surface on the light beam exit side of the first frame body 821. Therefore, the surface on the light beam exit side of the incident side polarizing plate 442G is separated from the surface on the light beam incident side of the base frame body 811 and is not in contact with it.

  Next, the operation of the first frame body 820 relative to the base frame body 810 is suppressed using the rotation suppressing portion (the suppression assisting member 840 and the suppressing member). Specifically, after overlapping the first frame 820 and the base frame 810 as described above, as shown in FIGS. 8 and 11, along the inner peripheral surface of the first protrusion 814 </ b> A of the base frame 810. Then, the guide piece 843 of the suppression assisting member 840 is inserted and engaged.

Next, the restraining auxiliary member 840 is arranged so that the restraining screw guide hole 842 of the restraining assisting member 840 is positioned in the loose fitting portion 825 of the first frame body 820 through which the first screw hole 815A of the base frame body 810 is inserted. Adjust the position. Then, the suppression screw 850 is brought into communication with the suppression screw guide hole 842 and screwed (screw tightened) into the first screw hole 815A of the base frame body 810. At this time, the suppression screw 850 is screwed in a state where the screw is not tightened to the end.
This completes the attachment of the first frame 820 to the base frame 810. FIG. 7 shows a state where the first frame 820 is attached to the base frame 810.

Next, the second frame body 830 is attached to the base frame body 810.
Prior to this, first, as shown in FIGS. 9 to 11, with respect to the second frame body 830, the glass substrate 890 with the phase difference plate 444G attached thereto, with the upright portions 831A and 831B as a reference, Attached to the periphery of the opening 832 from the light beam exit side. The glass substrate 890 is fixed to the second frame body 831 with a heat conductive double-sided tape, an adhesive, or the like.

  Next, as shown in FIGS. 9 and 10, the second frame 830 is fixed to the base frame 810. This fixing is performed in the same manner as fixing the first frame 820 described above to the base frame 810. Specifically, the second protrusion 814B of the base frame 810 is inserted into the second hole 834 of the second frame 830, and the surface of the second frame main body 831 on the light beam incident side is fitted to the base frame main body 811. On the surface of the light beam exit side. As a result, the base frame 810 pivotally supports the second frame 830 about the rotation axis K2.

  Next, the second frame body 830 and the base frame body 810 are sandwiched and fixed using the holding spring 860. Specifically, after the second frame body 830 and the base frame body 810 are overlapped as described above, the second frame body 830 and the base frame body 810 corresponding to the locking portions 816C and 816D of the base frame body 810 are formed. The holding spring 860 is slid so as to be pinched from the end. Then, the hole 861 of the holding spring 860 is locked to the cut and raised portions of the locking portions 816C and 816D. At that time, as shown in FIG. 10, the second screw hole 815 </ b> B formed in the protruding shape of the base frame body 810 is inserted into the loosely fitting portion 835 of the second frame body 830.

  Next, the operation of the second frame body 830 with respect to the base frame body 810 is suppressed using the rotation suppressing portion (the suppression assisting member 840 and the suppressing member). Specifically, after overlapping the second frame 830 and the base frame 810 as described above, as shown in FIGS. 9 and 10, along the inner peripheral surface of the second protrusion 814B of the base frame 810. Then, the guide piece 843 of the suppression assisting member 840 is inserted and engaged.

Next, the restraining assisting member 840 is arranged such that the restraining screw guide hole 842 of the restraining assisting member 840 is positioned in the loosely fitting portion 835 of the second frame 830 inserted through the second screw hole 815B of the base frame 810. Adjust the position. Then, the suppression screw 850 is brought into communication with the suppression screw guide hole 842 and screwed (screw tightened) into the second screw hole 815B of the base frame body 810. At this time, the suppression screw 850 is screwed in a state where the screw is not tightened to the end.
Thus, the attachment of the second frame body 830 to the base frame body 810 is completed. FIG. 9 shows a state where the second frame 830 is attached to the base frame 810.

  As described above, as shown in FIG. 9, the first frame 820 and the second frame 830 are assembled and fixed to the base frame 810, and the angle adjustment mechanism 800 is completed. In this state, the tip of the screw portion of the restraining screw 850 screwed into the first screw hole 815A of the base frame body 810 protrudes to the light beam exit side of the base frame body 811 as shown in FIGS. It is located in the escape hole 837 of the second frame 830. Similarly, as shown in FIG. 10, the tip of the screw portion of the suppression screw 850 screwed into the second screw hole 815B of the base frame body 810 protrudes toward the light beam incident side of the base frame body 811 and the first frame body 820. Is located in the relief hole 827.

Next, the assembled angle adjusting mechanism 800 is attached to the base frame body receiving portion 453.
Specifically, the base frame fixing part 813 of the base frame 810 to which the first frame 820 and the second frame 830 are fixed is installed in the base frame receiving part 453. More specifically, the hole 813B formed in the base frame fixing portion 813 of the base frame body 810 is fitted into the guide protrusion 455 formed in the base frame body receiving portion 453 as shown in FIG. Then, the hole portion 813C of the base frame fixing portion 813 is positioned by fitting into the guide protrusion 456 of the base frame body receiving portion 453. Thereby, the base frame fixing portion 813 of the base frame body 810 is placed on the upper surface 453A of the base frame body receiving portion 453. Thereafter, the fixing screw 870 passes through the hole 813A of the base frame fixing portion 813 and is screwed into the fixing hole 454 of the base frame body receiving portion 453.
Thus, the attachment of the angle adjustment mechanism 800 to the base frame body receiving portion 453 is completed.

  Although the configuration and assembly of the angle adjustment mechanism 800 for green light have been described above, the angle adjustment mechanism 800 for red light and blue light is the same. Moreover, the state which fixed the angle adjustment mechanism 800 assembled for every color light to the base frame body receiving part 453 provided for every color light becomes a figure shown in FIG.

12 and 13 are plan views showing the adjusting operation of the angle adjusting mechanism. Specifically, FIG. 12 is a plan view showing the angle adjustment operation of the first frame 820, and FIG. 13 is a plan view showing the angle adjustment operation of the second frame 830. For convenience of explanation, FIG. 12 illustrates a configuration related to the angle adjustment operation of the first frame 820, and illustration of a configuration related to the angle adjustment operation of the second frame 830 is omitted. FIG. 13 illustrates the configuration related to the angle adjustment operation of the second frame 830, as in FIG. 12, and does not illustrate the configuration related to the angle adjustment operation of the first frame 820. FIG. 12 is a plan view seen from the light beam incident side. FIG. 13 shows a plan view seen from the light beam exit side.
The angle adjustment operation of the first frame 820 and the second frame 830 will be described with reference to FIGS.

  Initially, with reference to FIG. 12, the angle adjustment operation | movement of the 1st frame 820 is demonstrated. For convenience of explanation, the initial position of the first frame 820 is a position where the upper surface of the first receiving portion 826 of the first frame 820 is in the horizontal direction (a position indicated by a two-dot chain line in FIG. 12). To do. Further, the polarization axis of the incident-side polarizing plate 442G at that time and the direction of the polarization axis are shown as a polarization axis A shown in FIG. The state of the first frame 820 is substantially the same as the state illustrated in FIG. The base frame body 810 is fixed to the base frame body receiving portion 453. Further, as described above, the angle adjustment is performed using an angle adjusting jig (not shown).

  First, an arm portion (not shown) extending from the angle adjusting jig is engaged with a first receiving portion 826 indicated by a two-dot chain line. Thereafter, the arm portion is moved (pressed down) to the first receiving portion 826 indicated by the solid line by applying a force F downward to the first receiving portion 826 indicated by the two-dot chain line, for example. When the force F is received (transmitted) to the first receiving portion 826 indicated by a two-dot chain line, the first frame 820 is pivotally supported by the first protrusion 814A of the base frame 810 while rotating. With K1 as the center, as shown in FIG. 12, when viewed from the light beam incident side, rotation is performed clockwise. Note that the rotation by the force F causes the first frame 820 to rotate clockwise to the rotation angle θ1.

When the first frame 820 rotates by θ1, the polarization axis of the incident-side polarizing plate 442G accommodated in the first frame 820 rotates by θ2. In the present embodiment, θ1 and θ2 are equal. Assuming that the polarization axis in the state rotated by θ2 is the polarization axis B, the polarization axis is moved (rotated) clockwise by θ2 from the position of the polarization axis A to the position of the polarization axis B, and the angle adjustment is performed. It becomes. Although not shown in the drawings, when an upward force F is applied to the first receiving portion 826, the first frame 820 rotates counterclockwise about the rotation axis K1 so that the polarization axis of the first frame 820 rotates. Adjust the angle.
As described above, the angle of the polarization axis of the incident-side polarizing plate 442G is adjusted by adjusting the rotation angle of the first frame 820.

  When the first frame 820 is pivotally supported by the first protrusion 814A and rotates, for example, in the clockwise direction, the first frame 820 is sandwiched between two holding springs 860 as shown in FIG. Therefore, the first frame main body 821 including the holding piece 823 rotates while being in contact with the base frame main body 811.

  The rotation angle range (angle adjustment range) θ in which the first frame 820 rotates is not particularly limited, but is in the range of about ± 6 degrees in the present embodiment. Therefore, the angle of the polarization axis of the incident side polarizing plate 442G is adjusted within a range of about ± 6 degrees. Further, the loosely fitting portion 825 of the first frame body 820 has a hole having a shape that allows rotation of the angle adjustment range θ, and loosely fits the suppression screw 850. Thereby, even if the 1st frame 820 rotates, the loosely fitting part 825 of the 1st frame 820 does not interfere (contact | abut) to the suppression screw 850 if it is the range of angle adjustment range (theta). Further, the escape hole 827 of the first frame body 820 has a hole having a shape that allows rotation of the angle adjustment range θ. Thereby, even if the 1st frame 820 rotates, if the relief hole 827 of the 1st frame 820 is the range of angle adjustment range (theta), the suppression screw 850 as a suppression member of the 2nd frame 830 will be sufficient as it. Does not interfere (abut) with the screw.

  After adjusting the angle of the first frame 820 (adjusting the angle of the polarization axis of the incident-side polarizing plate 442G), the suppression screw 850 is screwed into the first screw hole 815A of the base frame 810 to the end. At this time, a suppression assisting member 840 is interposed between the first frame body 820 and the suppression screw 850, and the suppression assisting member 840 engages the guide piece 843 with the inner surface of the first protrusion 814A. The suppression screw 850 is inserted into the suppression screw guide hole 842, and the suppression screw 850 is screwed into the first screw hole 815A of the base frame body 810. With this structure, the suppression assisting member 840 is fixed to the base frame 810.

  With this structure, after adjusting the angle of the first frame 820 (adjusting the polarization axis of the incident-side polarizing plate 442G), the suppression screw 850 is screwed into the first screw hole 815A of the base frame 810 to the end. In this case, the force (moment) due to the tightening of the restraining screw 850 is not transmitted as the force for rotating the first frame 820. More specifically, when the suppression screw 850 is tightened, the pressing portion 841 of the suppression auxiliary member 840 presses the first frame main body 821 and fixes the first frame main body 821 to the base frame main body 811. As a result, the first frame body 820 that has adjusted the angle of the polarization axis of the incident-side polarizing plate 442G is fixed to the base frame body 810 while maintaining the adjusted angle.

  Next, the angle adjustment operation of the second frame 830 will be described with reference to FIG. The angle adjusting operation of the second frame 830 is the same as the angle adjusting operation of the first frame 820 described above. Details will be described below.

  Here, for convenience of explanation, the initial position of the second frame 830 is a position where the upper surface of the second receiving portion 836 of the second frame 830 is in the horizontal direction (position indicated by a two-dot chain line in FIG. 13). And In addition, the optical axis of the retardation film 444G at that time and the direction of the optical axis are indicated as an optical axis A shown in FIG. The state of the second frame 830 is substantially the same as the state illustrated in FIG. The base frame body 810 is fixed to the base frame body receiving portion 453. Further, as described above, the angle adjustment is performed using an angle adjusting jig (not shown).

  First, an arm portion (not shown) extending from the angle adjusting jig is engaged with a second receiving portion 836 indicated by a two-dot chain line. Thereafter, the arm portion moves (lifts) the second receiving portion 836 indicated by the two-dot chain line to the second receiving portion 836 indicated by the solid line by applying a force F upward, for example. When the force F is received (transmitted) to the second receiving portion 836 indicated by the two-dot chain line, the second frame 830 is pivotally supported while being pivotally supported by the second protrusion 814B of the base frame 810. As shown in FIG. 13, the rotation is performed counterclockwise around K2 as viewed from the light beam exit side. The second frame 830 is rotated counterclockwise to the rotation angle θ1 by the rotation by the force F.

When the second frame 830 rotates by θ1, the optical axis of the phase difference plate 444G accommodated in the second frame 830 rotates by θ2. In the present embodiment, θ1 and θ2 are equal. When the optical axis rotated by θ2 is the optical axis B, the angle of the optical axis is adjusted by moving (rotating) counterclockwise by θ2 from the position of the optical axis A to the position of the optical axis B. It will be. Although not shown in the drawings, when a downward force F is applied to the second receiving portion 836, the second frame 830 rotates clockwise about the rotation axis K2, so that the angle of the optical axis is increased. Make adjustments.
As described above, the angle of the optical axis of the phase difference plate 444G is adjusted by adjusting the rotation angle of the second frame 830.

  When the second frame body 830 is pivotally supported by the second protrusion 814B and rotates, for example, counterclockwise, the second frame body 830 is sandwiched by two holding springs 860 as shown in FIG. Therefore, the second frame body 831 including the holding piece 833 rotates while being in contact with the base frame body 811.

  The rotation angle range (angle adjustment range) θ in which the second frame body 830 rotates is not particularly limited, but in the present embodiment, in the same manner as the first frame body 820, a range of about ± 6 degrees. Is within. Therefore, the angle of the optical axis of the phase difference plate 444G is adjusted within a range of about ± 6 degrees. Further, the loosely fitting portion 835 of the second frame body 830 has a hole having a shape that allows rotation of the angle adjustment range θ, and loosely fits the suppression screw 850. Thereby, even if the 2nd frame 830 rotates, the loosely fitting part 835 of the 2nd frame 830 does not interfere (contact | abut) to the suppression screw 850 if it is the range of angle adjustment range (theta). Further, the escape hole 837 of the second frame 830 has a hole having a shape that allows rotation of the angle adjustment range θ. Thereby, even if the 2nd frame 830 rotates, if the escape hole 837 of the 2nd frame 830 is the range of angle adjustment range (theta), the suppression screw 850 as a suppression member of the 1st frame 820 is set. Does not interfere (abut) with the screw.

  After adjusting the angle of the second frame 830 (adjusting the angle of the optical axis of the phase difference plate 444G), the suppression screw 850 is screwed into the second screw hole 815B of the base frame 810 to the end. At this time, a suppression assisting member 840 is interposed between the second frame body 830 and the suppression screw 850, and the suppression assisting member 840 engages the guide piece 843 with the inner surface of the second protrusion 814B. The suppression screw 850 is inserted through the suppression screw guide hole 842, and the suppression screw 850 is screwed into the second screw hole 815B of the base frame 810. With this structure, the suppression assisting member 840 is fixed to the base frame 810.

  With this structure, after adjusting the angle of the second frame 830 (adjusting the angle of the optical axis of the phase difference plate 444G), the suppression screw 850 is screwed into the second screw hole 815B of the base frame 810 to the end. In this case, the force (moment) due to the tightening of the restraining screw 850 is not transmitted as a force for rotating the second frame 830. More specifically, when the suppression screw 850 is tightened, the pressing portion 841 of the suppression auxiliary member 840 presses the second frame main body 831 and fixes the second frame main body 831 to the base frame main body 811. Thereby, the second frame body 830 that has adjusted the angle of the optical axis of the phase difference plate 444G is fixed to the base frame body 810 while maintaining the adjusted angle.

  By adjusting the angle adjustment mechanism 800 described above, the angle adjustment of the polarization axis of the incident-side polarizing plate 442G in the first frame body 820 and the angle adjustment of the optical axis of the phase difference plate 444G in the second frame body 830 are performed. In the above description, the adjustment method of the adjustment mechanism for green light has been described, but the adjustment method of the adjustment mechanism for red light and blue light is the same.

According to the embodiment described above, the following effects can be obtained.
(1) In the angle adjustment mechanism 800 of this embodiment, the force at the time of adjustment is transmitted by the first receiving portion 826 (receiving portion as the adjusting portion) of the first frame 820. Then, the first frame 820 is pivotally supported by the first projection 814A (projection 814 as a pivotal support) of the base frame 810, and the first frame 820 is rotated with respect to the base frame 810 around the rotation axis K1. Let Thus, by rotating the first frame body 820 relative to the base frame body 810, the incident-side polarizing plate 442 accommodated in the first frame 820 is rotated, so that the angle of the incident-side polarizing plate 442 is increased. Adjustments can be made. The same applies to the second frame 830. As described above, when the angles of the incident-side polarizing plate 442 and the phase difference plate 444 are adjusted, the angle is adjusted by a simple operation of moving the first receiving portion 826 and the second receiving portion 836 in the vertical direction. Can be done properly. In the present embodiment, angle adjustment is not performed using a conventionally used screw. Therefore, when adjusting the angles of the incident-side polarizing plate 442 and the phase difference plate 444, the influence of backlash and the like can be eliminated, so that the angle adjustment can be easily and accurately performed as compared with the prior art.

  The suppression assisting member 840 is fixed to the base frame 810 by a guide piece 843 as a suppression assisting member guide (fixed portion) and a suppression screw guide hole 842 as a suppression member guiding portion (fixed). In addition, the suppression screw 850 (suppression member) connects the first frame 820 (accommodating frame) to the base frame 810 via the pressing portion 841 (auxiliary portion) of the suppression auxiliary member 840 fixed to the base frame 810. It is fixed to. Accordingly, when the suppression screw 850 fixes the first frame body 820 whose angle has been adjusted to the base frame body 810 via the pressing portion 841, the suppression assisting member 840 is fixed to the base frame body 810 and the suppression assisting is performed. Since the movement of the member 840 is suppressed, it is possible to reduce the transmission of the influence (for example, the influence of the conventional rotational moment and the influence of the backlash) due to the operation of the suppression screw 850 to the first frame 820. This also applies to the second frame 830.

  By such a rotation suppression part (suppression auxiliary member 840, suppression member), the first frame body 820 and the second frame body 830 after completion of the angle adjustment are securely fixed to the base frame body 810 to suppress the rotation. Therefore, the angle adjustment mechanism 800 can reduce the influence of backlash and rotational moment to adjust the angle of the incident-side polarizing plate 442 and the phase difference plate 444, and can also reduce the deviation of the angle after the adjustment.

  (2) The angle adjusting mechanism 800 according to the present embodiment includes the first projecting portion 814A and the second projecting portion 814B (the projecting portion 814 as the shaft supporting portion) formed on the base frame body 810, so that the first The protrusion 814 is fitted into the first hole 824 and the second hole 834 (hole as a shaft support) formed in the frame 820, the second frame 830 (housing frame), and the rotation shaft It is pivotally supported around K1 and K2. Therefore, with such a simple configuration, the first frame 820 and the second frame 830 can be reliably pivoted and smoothly rotated with respect to the base frame 810.

  (3) The angle adjustment mechanism 800 according to the present embodiment includes a simple first protrusion 814A, second protrusion 814B (protrusion 814), first hole 824, and second hole 834 (hole). Depending on the configuration, it is possible to realize a shaft support portion on which the first frame body 820 and the second frame body 830 are pivotally supported on the base frame body 810. In addition, since the protrusion 814 and the hole can be easily processed, the processing time can be reduced. Moreover, since the structure which fits a hole part in the projection part 814 can be implement | achieved without using another member, a number of parts and an assembly man-hour can be reduced.

  (4) In the angle adjustment mechanism 800 of the present embodiment, the fixing portion of the suppression assisting member 840 includes a guide piece 843 as a suppression assisting member guide and a suppression screw guide hole 842 as a suppression member guiding. It is configured. And the guide piece 843 (suppression auxiliary member guide part) engages with the protrusion part 814 (1st protrusion part 814A, 2nd protrusion part 814B), and guides the suppression auxiliary member 840 itself. The suppression screw guide hole 842 (suppression member guide portion) guides the suppression screw 850 (suppression member) to install the suppression auxiliary member 840, and the suppression auxiliary member 840 is attached to the base frame 810 by the suppression screw 850. Fixed. With this configuration, the fixing portion of the suppression assisting member 840 can be installed in the region of the protruding portion 814 (first protruding portion 814A, second protruding portion 814B) or the suppressing member (suppressing screw 850). Therefore, it is not necessary to install the fixing portion of the suppression assisting member 840 in the region of the base frame 810 that is not affected by the rotation of the first frame 820 and the second frame 830, and the efficient arrangement of the suppression assisting member 840. Therefore, a compact angle adjustment mechanism 800 can be realized.

  (5) The angle adjustment mechanism 800 of the present embodiment uses a screw 850 as a restraining member and screw holes 815 (first screw holes 815A, second screw holes 815B) as screwing portions of the base frame body 810 and screws. A simple configuration and a simple method are used. With this configuration, the influence of the conventional screw is reduced on the first frame 820 and the second frame 830 after the angle adjustment is completed, and the first frame 820 and the second frame 830 are added to the base frame 810. Is securely fixed.

  (6) In the angle adjustment mechanism 800 of the present embodiment, the base frame 810 is arranged on the front side (light beam incident side) and rear side (light beam emission side) of the base frame body 810 in the direction along the illumination optical axis L. The first frame 820 and the second frame 830 are pivotally supported. With this configuration, angle adjustment can be performed on each of the two optical elements of the incident-side polarizing plate 442 and the phase difference plate 444. In addition, a compact angle adjustment mechanism 800 can be realized.

  (7) In the angle adjustment mechanism 800 of the present embodiment, the base frame 810 is set substantially symmetrically with respect to a vertical (Z-axis direction) plane passing through the illumination optical axis L in the direction along the illumination optical axis L. ing. With this configuration, the first frame body 820 and the second frame body 830 that are pivotally supported on the front side and the rear side of the base frame body 810 can be designed as substantially the same shape, so that the design efficiency can be improved. Further, a more compact angle adjustment mechanism 800 can be realized.

  (8) The angle adjusting mechanism 800 of the present embodiment sandwiches and holds the base frame body 810 and the first frame body 820 by a holding spring 860 as a holding member, and also the base frame body 810 and the second frame body. 830 is sandwiched and held. Accordingly, the base frame body 810 and the first frame body 820 can be fixed so as not to be separated from each other, and the base frame body 810 and the second frame body 830 can be fixed so as not to be separated from each other. In addition, the holding spring 860 sandwiches the base frame body 810 and the first frame body 820, and the base frame body 810 and the second frame body 830, so that rattling can be suppressed. The first frame 820 can be smoothly rotated. Similarly, the second frame 830 can be smoothly rotated with respect to the base frame 810.

  (9) In the angle adjustment mechanism 800 of the present embodiment, the holding member can be realized with a simple configuration of a spring member (holding spring 860). Further, since it is a spring member, a spring force (in this embodiment, a force for sandwiching the base frame 810 and the first frame 820, or a force for sandwiching the base frame 810 and the second frame 830). The degree of freedom for appropriately setting is expanded.

  (10) The projector 1 according to the present embodiment can adjust the angles of the polarization axis and the optical axis optimally by adjusting the angles of the incident-side polarizing plate 442 and the phase difference plate 444 by the angle adjusting mechanism 800. Therefore, the optical image to be projected can be an optical image with high contrast and high brightness. In addition, the angle adjustment mechanism 800 can reduce the deviation of the polarization axis and the optical axis of the incident side polarizing plate 442 and the phase difference plate 444 even after adjustment, and maintain the adjusted angle, so that stable quality can be maintained. Can be maintained.

  (11) In the projector 1 according to the present embodiment, in the angle adjustment mechanism 800, the base frame fixing portion 813 of the base frame body 810 serving as a reference for installation is installed in front of the phase difference plate 444 and the incident side polarizing plate 442. It is fixed to the base frame body receiving part 453 of the optical housing 45 that houses the front optical element including the field lens 419. Accordingly, the angle adjustment mechanism 800 can be fixed to the base frame body receiving portion 453 with a simple configuration, and the angle adjustment work can be made more efficient.

  (12) The angle adjustment mechanism 800 of the present embodiment adjusts the angle of the incident-side polarizing plate 442 and the phase difference plate 444, and then the base frame body 810 by the rotation suppression unit (suppression auxiliary member 840, suppression member). In addition, by fixing the first frame body 820 and the second frame body 830, it is possible to suppress the subsequent change in angle (maintain the adjustment angle). For this reason, after fixing by the rotation suppressing portion, the work of adhering and fixing the first frame body 820 and the second frame body 830 to the base frame body 810 with an adhesive or the like becomes unnecessary. Further, when the angle adjustment is necessary again for some reason, the angle adjustment can be repeatedly performed by loosening the restraining screw 850 and releasing the fixing. As a result, when the angle needs to be adjusted again after the angle adjustment, an operation such as peeling off the adhesive or the like is not necessary. Therefore, the first frame 820, the second frame 830, and the base frame due to the peeling are not necessary. There is no fear of the body 810 being damaged, and the angle can be adjusted again efficiently. It is possible to improve the work efficiency for so-called rework.

  (13) In the projector 1 of the present embodiment, the base frame body 810 of the angle adjustment mechanism 800 includes a front side including the incident side polarizing plate 442 for adjusting the mounting angle and the field lens 419 installed in front of the phase difference plate 444 ( It is fixed to an optical housing 45 that houses the optical element on the light source device 411 side. According to this configuration, the optical element accommodated in the optical housing 45 and the optical element adjusted by the angle adjustment mechanism 800 can be handled as an integral component (unit), and this unit can be used during actual angle adjustment. By using this, the angle can be adjusted efficiently. Further, when this unit whose angle has been adjusted is incorporated into the exterior case 2 of the projector 1, it can be easily incorporated because it is integrated. Also in the rework, the angle adjustment mechanism 800 can be easily detached from the optical housing 45, so that the work efficiency is improved.

  In addition, it is not limited to embodiment mentioned above, It is possible to add and implement various changes, improvements, etc. A modification will be described below.

  (Modification 1) In the above-described embodiment, the fixing portion of the suppression assisting member 840 included in the rotation suppression portion is a guide piece 843 as a suppression assisting member guide portion and a suppression screw guide hole 842 as a suppression member guide portion. It is configured. However, the present invention is not limited to this, and any fixing portion having a structure capable of fixing the suppression assisting member 840 to the base frame 810 may be used. Specifically, the fixing portion (suppression auxiliary member guide portion) is not only the structure of the guide piece 843 that engages with the protrusion 814, but also the main body of each of the first frame body 820 and the second frame body 830 after angle adjustment. Any structure may be used as long as the suppression assisting member 840 is fixed to the base frame body 810 so that the rotating force (moment) does not act on the first frame body 821 and the second frame body 831.

  (Modification 2) In the above-described embodiment, the base frame body 810 is arranged on the front side (light beam incident side) and the rear side (light beam emission side) across the base frame body 810 in the direction along the illumination optical axis L. The first frame 820 and the second frame 830 are pivotally supported. However, the present invention is not limited to this, and the base frame body may support the housing frame body on one of the front side and the rear side of the base frame body in the direction along the illumination optical axis L. Specifically, the base frame body may simply support the housing frame on the front side of the base frame body in the direction along the illumination optical axis L, and the base frame body extends along the illumination optical axis L. The receiving frame may be only pivotally supported on the rear side of the base frame in the above direction. Thereby, the side which supports an accommodation frame can be suitably decided on optical design. Further, it is possible to improve the degree of freedom of the positional relationship between the optical element that performs angle adjustment, the housing frame that houses the optical element, and the base frame that pivotally supports the housing frame.

  (Modification 3) In the embodiment described above, the angle adjustment mechanism 800 adjusts the attachment angle with respect to the incident-side polarizing plate 442 and the retardation plate 444 as optical elements. However, the present invention is not limited to this, and the attachment angle may be adjusted for a viewing angle correction plate that expands the viewing angle.

  (Modification 4) In the embodiment described above, the angle adjustment mechanism 800 adjusts the angle with respect to the optical elements (incident side polarizing plate 442 and retardation plate 444) in front of the liquid crystal panel 441. However, the present invention is not limited to this, and the angle may be adjusted with respect to an optical element (e.g., the exit-side polarizing plate 443) installed behind the liquid crystal panel 441. In this case, the angle adjustment mechanism can be realized by a configuration in which the optical housing 45 (upper housing housing 45A) is installed extending to the rear of the liquid crystal panel 441. Further, it can be realized by a configuration in which an angle adjusting mechanism is installed in the cross dichroic prism 445, the fixed frame 48, or the like.

  (Modification 5) In the embodiment described above, the projector 1 uses the three liquid crystal panels 441R, 441G, and 441B, but the invention is not limited to this. For example, the present invention can be applied to a projector using only one liquid crystal panel, a projector using two liquid crystal panels, or a projector using four or more liquid crystal panels.

  (Modification 6) In the embodiment, the projector 1 uses the transmissive liquid crystal panel 441. However, it is also possible to use a reflective electro-optical device such as a reflective liquid crystal panel.

  (Modification 7) In the embodiment described above, the projector 1 uses a discharge lamp as the light source device 411. However, the present invention is not limited to this, and an LED (Light Emitting Diode) element or the like can be used as the light source.

  (Modification 8) In the above embodiment, the projector 1 is applied as a front type projector, but it can also be applied to a rear type projector integrally having a screen as a projection target surface.

1 is a schematic perspective view of a projector according to an embodiment of the present invention as viewed from the top side. The schematic perspective view seen from the lower surface side of the projector. The perspective view which shows the internal structure of a projector. The figure which shows the optical system of an optical unit typically. The schematic perspective view which shows an adjustment mechanism. The exploded perspective view of an adjustment mechanism. The perspective view which shows the state which assembled the 1st frame to the base frame. The perspective view which shows the state cut | disconnected in the AA position in FIG. The perspective view which shows the state which assembled the 2nd frame to the base frame after assembling the 1st frame to the base frame. The perspective view which shows the state cut | disconnected in the BB position in FIG. The cross-sectional view along the illumination optical axis of the angle adjustment mechanism. The top view which shows adjustment operation | movement of an angle adjustment mechanism (1st frame). The top view which shows adjustment operation | movement of an angle adjustment mechanism (2nd frame).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 4 ... Optical unit, 45A ... Upper housing | casing, 411 ... Light source device, 441 ... Liquid crystal panel (electro-optical device), 442 ... Incident side polarizing plate, 444 ... Phase difference plate, 453 ... Base frame receptacle , 800 ... Angle adjustment mechanism (adjustment mechanism), 814 ... Projection (shaft support), 814A ... First projection, 814B ... Second projection, 815 ... Screw hole (screwing part), 815A ... First screw Hole, 815B ... second screw hole, 816 ... locking part, 820 ... first frame (accommodating frame), 824 ... first hole (shaft support), 826 ... first receiving part (adjusting part), 830 ... 2nd frame (accommodating frame), 834 ... 2nd hole (shaft support), 836 ... 2nd receiving part (adjustment part), 840 ... Suppression auxiliary member (rotation suppression part), 841 ... Pressing part ( Auxiliary part), 842... Suppression screw guide hole (suppression member guide part (fixed part)), 843. Braking auxiliary member guiding portion (fixed portion)), 850 ... suppression screw (suppressing member (rotation suppressing portion)), 860 ... holding spring (holding member), 870 ... fixing screws.

Claims (10)

An adjustment mechanism for adjusting the mounting angle of the optical element,
A base frame,
A housing frame for housing the optical element;
The base frame has a rotation axis set substantially parallel to the illumination optical axis of the optical system including the optical element, and is formed on the base frame and the housing frame around the rotation axis. A shaft support for pivotally supporting the housing frame;
An adjusting portion formed on the housing frame and rotating the housing frame relative to the base frame by the pivot support;
A suppression assisting member for assisting suppression of the operation of the storage frame relative to the base frame, and a suppression member for suppressing rotation of the storage frame relative to the base frame via the suppression assisting member; A rotation suppressor having
An adjustment mechanism comprising: The adjustment mechanism according to claim 1,
The shaft support portion formed on the base frame body has a protruding portion that protrudes around the rotation shaft,
The shaft support formed in the housing frame has a hole centered on the rotating shaft,
The adjusting mechanism, wherein the base frame pivotally supports the housing frame by the fitting of the protrusion and the hole. The adjustment mechanism according to claim 2,
An adjustment mechanism, wherein the suppression auxiliary member includes a suppression auxiliary member guide portion that engages with the protrusion and guides the suppression auxiliary member, and a suppression member guide portion that guides the suppression member. The adjustment mechanism according to any one of claims 1 to 3,
The restraining member is constituted by a screw, and the screw is screwed with a screwing portion formed on the base frame body via the restraining auxiliary member. The adjustment mechanism according to any one of claims 1 to 4,
The adjusting mechanism, wherein the base frame supports the housing frame on at least one of a front side and a rear side of the base frame in a direction along the illumination optical axis. The adjustment mechanism according to claim 5,
When the base frame supports the housing frame on the front side and the rear side of the base frame in a direction along the illumination optical axis, each of the rotation axes passes through the illumination optical axis. An adjustment mechanism characterized by being set substantially symmetrically with respect to a vertical plane. The adjustment mechanism according to any one of claims 1 to 6,
An adjustment mechanism comprising: a holding member that holds the base frame body and the housing frame body therebetween. The adjustment mechanism according to claim 7,
The holding mechanism is constituted by a spring member. A light source;
An electro-optical device that modulates a light beam emitted from the light source based on an image signal to form an optical image;
A projector comprising: the adjustment mechanism according to claim 1. The projector according to claim 9, wherein
The projector is characterized in that the base frame body of the adjustment mechanism is fixed to an optical housing that houses an optical element installed on the light source side as compared with the optical element that adjusts the mounting angle.

Images