JP2019070723A - Projection type display unit and method for adjusting the same - Google Patents

Abstract

To provide a projector that has high definition over the entire movable range of a lens shift mechanism.SOLUTION: A projection type display unit comprises: a light modulation element that is irradiated with light from a light source; a holding member 1c that holds a projection optical system projecting light from the light modulation element; a lens shift mechanism 1 that moves the holding member in a direction intersecting the optical axis of the projection optical system; an adjustment mechanism that changes the direction in which the projection optical system is moved by the lens shift mechanism 1; and an adjustment mechanism that can change the inclination of a surface on which the projection optical system is held independent of the change in shift direction of the adjustment mechanism.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a projection display device and a method of adjusting the same, and more particularly to a projection display device having a lens shift mechanism.

  2. Description of the Related Art In recent years, in a projection type display device (hereinafter referred to as a projector), high resolution is required in order to project a fine data image and a scene close to reality on a wall surface. In order to achieve high density (high definition) of pixels with the same screen size, it is necessary to make the pixel pitch of the light modulation elements (liquid crystal panel, digital mirror device, etc.) inside the projector smaller (fine).

  Further, as the pixel pitch becomes finer, the accuracy required for focus adjustment becomes higher. Therefore, it is necessary to adjust the position and posture of the projection lens with respect to the display element with higher accuracy.

  In the attitude of the projection lens, it is desirable that the optical axis be orthogonal to the plane of the light modulation element. If these tilt (tilt) or the surfaces of the projection lens and the light modulation element shift in the direction of the optical axis (flange back fluctuation), the focal point of the projected light flux may shift from the projection surface, which may lead to defocusing or the like. is there. In many cases, since the projection lens includes component errors, mounting errors, and the like between the projection lens and its holding member, adjustment of falling or flange back is made at the time of assembly.

  In addition, in recent years, in order to align the position of the projection image on a desired position on the projection surface such as a screen, the projector is equipped with a position adjustment mechanism of the projection lens (hereinafter referred to as a lens shift mechanism). Is increasing.

  The lens shift mechanism is generally configured to move (shift) the projection lens in a direction crossing (orthogonal to) its optical axis. By shifting the projection lens, the position of the projection image can be adjusted while maintaining the installation position of the projector and the size of the projection image.

  In order to make the resolution of the projection image compatible with the mounting of the lens shift mechanism, the posture and the distance of the projection lens with respect to the light modulation element are maintained with high accuracy (from the adjusted state, the tilt and the flange back fluctuation It is necessary to shift the lens so that

  Patent Document 1 proposes an adjustment mechanism capable of adjusting the tilt of a projection lens in a lens shift mechanism. In this lens shift mechanism, a shaft for guiding the projection lens and its holding member (X-axis movable base) in the shift direction is fixed to the fixed member. The tilt of the projection lens can be adjusted by adjusting the tilt of the shaft.

WO 2013/054426

  However, when tilt adjustment of the projection lens is performed using a shaft for lens shift, the direction of the shaft may not be parallel to the panel. In this case, since the projection lens is shifted in a direction not parallel to the panel, flange back fluctuation of the surface of the projection lens and the panel occurs after the lens shift. As a result, the projection lens may need to be readjusted.

  As described above, in the configuration in which the lens shift and the tilt adjustment of the projection lens are combined, the tilt adjustment of the projection lens and the adjustment of the direction of the lens shift are incompatible.

  Therefore, an object of the present invention is to provide a projector that has high resolution over the entire movable range of the lens shift mechanism.

  In order to achieve the above object, a projection type display apparatus according to the present invention comprises: a light modulation element to which light from a light source is irradiated; and a holding member holding a projection optical system to project light from the light modulation element; A shift mechanism for moving the holding member in a direction crossing the optical axis of the projection optical system, an adjustment mechanism for changing the moving direction of the projection optical system by the shift mechanism, and a change of the shift direction of the adjustment mechanism And an adjusting mechanism capable of independently changing the tilt of the surface of the projection optical system to be held.

  According to the present invention, it is possible to provide a projector that has high resolution over the entire movable range of the lens shift mechanism.

An overall view of a projection display apparatus according to a first embodiment The perspective view of the lens shift mechanism concerning Example 1 Three views of the lens shift mechanism according to the first embodiment The figure before the fall adjustment of the lens shift mechanism which concerns on Example 1. Explanatory drawing of adjustment of the shift drive direction of the horizontal shift board which concerns on Example 1. Explanatory drawing of the adjusting screw which concerns on Example 1 Explanatory drawing of adjustment of the shift drive direction of the vertical shift board which concerns on Example 1. Explanatory drawing of fall adjustment of the projection lens attachment surface which concerns on Example 1 Explanatory drawing of the lens shift mechanism which concerns on Example 2.

Example 1
The projection display apparatus according to the present invention will be described below with reference to FIGS. 1 to 9.

(overall structure)
FIG. 1 shows a projection display 32 according to a first embodiment.

  Light from a light source lamp (light source) 33 is converted into light having a predetermined polarization direction via an illumination optical system (not shown), and is incident on a color separation / combination optical system 100. Reference numeral 104 denotes a dichroic mirror that reflects R (red) and B (blue) light and transmits G (green) light. The G light transmitted through the dichroic mirror 104 is directed to a half wavelength plate 114 that converts P polarized light into S polarized light. Reference numeral 102 denotes a G polarization beam splitter that transmits P-polarized light and reflects S-polarized light. The R light and B light reflected by the dichroic mirror 104 are directed to a wavelength selective polarization rotator 113 that produces R light of S polarization and B light of P polarization. Reference numeral 103 denotes an RB polarization beam splitter, which reflects R light of S polarization and transmits B light of P polarization to perform color separation.

  As described above, after the light from the light source lamp 33 is separated into G light, R light and B light, each light is a reflection type liquid crystal panel (light modulation element) 101G for green, a reflection type liquid crystal panel for red The light modulation element) 101R and the reflection type liquid crystal panel (light modulation element) 101B for blue are irradiated. Also, the light is directed to the green quarter-wave plate 105G, the red quarter-wave plate 105R, and the blue quarter-wave plate 105B.

  The reflective liquid crystal panel 101R for red and the quarter wavelength plate 105R for red are held by a holding plate 108R. The holding plate 108 R is bonded to the RB polarization beam splitter 103.

  Similarly, the reflective liquid crystal panel 101B for blue and the quarter wavelength plate 105B for blue are held by the holding plate 108B. The holding plate 108 B is bonded to the RB polarization beam splitter 103.

  Similarly, the reflective liquid crystal panel 101G for green and the quarter wavelength plate 105G for green are held by the holding plate 108G. The holding plate 108 G is bonded to the G polarization beam splitter 102.

  Reference numeral 106 denotes a combining beam splitter for combining R light, G light, and B light. The combining beam splitter 106 can be substituted for a dichroic mirror or a dichroic prism.

  The beam splitter for synthesis 106 is bonded and held to the prism base 109. The G polarization beam splitter 102 is bonded and held to the combining beam splitter 106 via the glass plate 112 a. Similarly, the RB polarization beam splitter 103 is bonded and held to the combining beam splitter 106 via the glass plate 112 b.

  The beam splitter 106 for combining combines the modulated lights of the three colors that have entered, and guides the combined light to the projection lens (projection optical system) 31. The projection lens 31 projects the combined modulated light of three colors onto a projection surface 107 such as a screen. Thereby, the projection image corresponding to the input video signal is displayed on the projection surface 107.

  The components of the projection type display device 32 are formed inside the exterior member E and installed on the installation surface 111 via the installation foot 110.

  In the present invention, the reflective liquid crystal panel 101R for red, the reflective liquid crystal panel 101G for green, and the reflective liquid crystal panel 101B for blue are used as light modulation elements. However, the invention can also be practiced with other light modulation elements such as digital micro mirror devices (DMDs).

  The projection lens 31 is movably held by a lens shift mechanism 1 in a plane orthogonal to (crossing) the optical axis of the projection lens 31.

(Lens shift mechanism)
FIG. 2A is a perspective view of the lens shift mechanism 1 according to the present embodiment. FIG. 2B is also a perspective view of the lens shift mechanism 1, and is a view as seen from the opposite side to FIG. 2A in the optical axis direction (in the positive direction of the y-axis). FIG. 3 is a projection view of the lens shift mechanism 1 and is a front view, a plan view, a bottom view and a right side view, respectively. For the direction of the lens shift mechanism 1, the horizontal direction in the front view of FIG. 3 is the x direction, the vertical direction is the z direction, and the near side in the drawing is the y direction (optical axis direction). The positive direction in the y direction is the side of the projection surface 107 (see FIG. 1) in the optical axis direction.

  Hereinafter, the details of the lens shift mechanism 1 according to the present embodiment will be described with reference to FIG.

  As shown in the plan view of FIG. 3, in the lens shift mechanism 1, the fixed member 1 a, the horizontal shift plate (intermediate moving member) 1 b, and the vertical shift plate (holding member) 1 c overlap in the y direction (positive direction). Configured The fixing member 1a is attached to a prism base 109 (see FIG. 1) by a fixing means such as a tap screw (not shown).

(Horizontal shift board)
The horizontal shift plate 1b is slidably held by a horizontal bar (first guide portion, in the present embodiment, an axial shape) 2x fixed to the fixing member 1a.

  The horizontal bar 2x extends in the x direction, and both ends thereof are fixed to the fixing member 1a by the fixing screws 4a and 4b. The horizontal shift plate 1b is fitted to the horizontal bar 2x at two places separated in the x direction. By this structure, the horizontal shift plate 1b is guided in the x direction with respect to the fixing member 1a.

(Vertical shift board)
The vertical shift plate 1c is slidably held by a vertical bar (second guide, in the present embodiment, an axial shape) 2z fixed to the horizontal shift plate 1b.

  The vertical bar 2z extends in the z direction, and both ends thereof are fixed to the horizontal shift plate 1b by fixing screws 4c and 4d. Also, the vertical shift plate 1c is fitted with the vertical bar 2z at two places separated in the z direction. With this structure, the vertical shift plate 1c is guided in the z direction with respect to the fixing member 1a.

  The vertical shift plate 1c holds the projection lens 31 (fixed screws 4e, 4f, 4g, 4h, see FIG. 2A). In the present embodiment, the projection lens 31 is attachable to and detachable from the vertical shift plate 1c (only the projection lens is replaceable), but may not be attachable and detachable.

(X direction drive structure)
The female screw portion 6x of the horizontal shift plate 1b (in the present embodiment, formed separately from the horizontal shift plate 1b) is screwed with the lead screw 5x. One end of the lead screw 5x is connected to the bearing (not shown) of the fixed member 1a, and the other end is connected to the actuator 7x of the fixed member 1a. When power is supplied from a power source (not shown) to the actuator 7x, the lead screw 5x is rotated, and the horizontal shift plate 1b is driven in the x direction.

(Z direction drive structure)
Similarly, the female screw 6z of the vertical shift plate 1c (which is formed separately from the vertical shift plate 1c in this embodiment) is screwed with the lead screw 5z. One end of the lead screw 5z is connected to a bearing (not shown) of the horizontal shift plate 1b, and the other end is connected to an actuator 7z of the horizontal shift plate 1b. When power is supplied to the actuator 7z from a power source (not shown), the lead screw 5z is rotated, and the vertical shift plate 1c is driven in the z direction.

(Bias structure)
Four pedestals 1c2 are installed on the fixing member 1a so as to surround the projection lens 31. The plate springs 8 are fixed to the pedestals 1c2 by fixing means such as screws.

  The plate spring 8 biases the horizontal shift plate 1b and the vertical shift plate 1c in the negative y direction toward the fixing member 1a.

(Specific example of adjustment)
In FIG. 4, an example of a state before performing adjustment (change of shift direction (moving direction), change of tilt (tilt) of projection lens 31, change of flange back) of the lens shift mechanism 1 according to the present embodiment Is shown. Note that, as a representative of the reflective liquid crystal panel 101B for blue, the reflective liquid crystal panel 101G for green, and the reflective liquid crystal panel 101R for red shown in FIG. It shows.

  In the state before adjustment shown in FIG. 4, the panel plane 101 is inclined with respect to the horizontal shift direction (first direction) 1x of the lens shift mechanism 1 and the vertical shift direction (second direction) 1z. That is, it is inclined with respect to the attachment surface (surface to which the projection lens 31 is fixed) 31 a of the projection lens 31.

  Therefore, in the state shown in FIG. 4, defocusing (resolution deterioration) of the projected image occurs. In addition, lens shift may cause flange back fluctuation, which may further cause defocus of the image to be projected.

(Overview of the reconciliation process)
For this reason, in the present embodiment, the shift direction of the lens shift mechanism is first adjusted as described below. Next, the inclination of the mounting surface 31 a on which the projection lens 31 is held with respect to the panel surface 101 is adjusted. Then, the distance (flange back) between the panel plane 101 and the mounting surface 31 a of the projection lens 31 is adjusted.

  In other words, the panel plane 101, the vector in the shift direction of the lens shift mechanism 1, the mounting surface 31a of the projection lens, and (three of them) are all brought close in parallel (adjusted to within a predetermined standard). Furthermore, make the flange back appropriate.

  Thereby, the resolution of the entire movable range of the lens shift mechanism 1 can be increased.

(Supplement of shift direction adjustment)
In the present embodiment, first, the shift direction of the projection lens 31 is adjusted to be parallel to the panel plane 101. Specifically, it is adjusted to be parallel to the reflective liquid crystal panel 101R.

  Here, with respect to the reflective liquid crystal panels 101B and 101G in which the optical path is bent as described above, the direction of the lens shift is not necessarily adjusted in parallel.

  However, the meaning of these adjustments is optically the same. That is, adjusting the lens shift direction to be parallel to the panel plane 101, which will be described below, includes the following adjustment. That is, the adjustment also includes making the direction of the lens shift perpendicular to the traveling direction (optical path) of light emitted from the light modulation element in the normal direction thereof and incident on the projection lens 31. In practice, adjustment may be made to the represented panel (in the present embodiment, the reflective liquid crystal panel 101R). Alternatively, adjustment may be made in accordance with a reference plane having an accuracy close to perpendicular to the traveling direction of the light emitted in the normal direction of the panel (in the present embodiment, the reflective liquid crystal panels 101G and 101B). As a reference plane, for example, the plane of the beam splitter 106 connected to each panel may be used. Thus, the reference of the adjustment of the shift direction is not limited to the contents exemplified in the present embodiment.

(Supplement of fall adjustment)
In the present embodiment, following the adjustment of the shift direction, the inclination of the mounting surface 31 a of the projection lens 31 with respect to the panel surface 101 is adjusted. In this embodiment, an adjustment in which the mounting surface 31a is made orthogonal to the traveling direction of light emitted from the light modulation element in the normal direction will be described. The purpose of the fall adjustment is to change the inclination of the optical axis of the projection lens 31 to be in the same direction as the normal to the panel surface 101 (the traveling direction of the light emitted from the light modulation element in the normal direction). Because of this, the criteria for this adjustment are not limited to those exemplified in this embodiment.

(First adjustment mechanism and mechanism)
The adjustment process according to this embodiment will be described below with reference to FIGS.

  First, the adjustment mechanism of the horizontal shift plate 1b in the shift direction will be described with reference to FIG. Hereinafter, this adjustment mechanism is referred to as a first adjustment mechanism.

  An adjusting screw 9x is screwed into the horizontal bar 2x between the fixing screw 4a and the fixing screw 4b at both ends thereof. As shown in the front view of FIG. 5, the horizontal bar 2x is rotated about the z-axis center by rotating one and the other of the adjusting screws 9x.

(Configuration of adjustment screw)
Here, the configuration of the adjusting screw 9x will be described. FIG. 6 is an explanatory view of an adjusting screw 9x according to this embodiment.

  FIG. 6A shows a detailed view of the adjusting screw 9x. The horizontal bar 2x is fixed to the fixing member 1a by the fixing screw 4a with freedom in each y direction (for example, the hole of the horizontal bar 2x has a larger diameter than the fixing screw 4a passing therethrough). A compression spring 10 is held between the fixing screw 4a and the horizontal bar 2x, and the biasing force of the compression spring 10 holds the position and the attitude of the horizontal bar 2x in the y direction.

  FIG. 6 (b) shows a cross section taken along line A-A of FIG. Since the adjusting screw 9x is screwed to the horizontal bar 2x, when the adjusting screw 9x is rotated, the adjusting screw 9x protrudes in the negative direction with respect to the horizontal bar 2x. Since one side of the horizontal bar 2x is lifted while compressing the compression spring 10 according to this, the distance between the fixing member 1a and the horizontal bar 2x can be changed according to the amount. Since the adjusting screws 9x are provided at two positions separated in the horizontal direction, the horizontal bar 2x is rotated around the z axis if only the adjusting screw 9x on one side is rotated. FIG. 6C shows the state before and after the rotation of the horizontal bar 2x.

  At the same time, the amount of rotation of the horizontal bar 2x about the z axis can be adjusted by rotating the adjustment screw 9x on the other side of the horizontal bar 2x in the same manner. That is, as shown in the plan view of FIG. 5, the direction 1x 'parallel to the panel plane 101 (long side) from the direction 1x' before adjustment of the horizontal shift direction (shown by the broken line in FIG. Can be adjusted to the solid line in the plan view of

  The tip of the adjusting screw 9x located on the negative side in the y direction is biased by the compression spring 10 in the negative direction in the y direction.

(Second adjustment mechanism and mechanism)
Next, the adjustment mechanism of the vertical shift plate 1c in the shift direction will be described with reference to FIG. Hereinafter, this adjustment mechanism is referred to as a second adjustment mechanism.

  An adjustment screw (sliding member) 9z is screwed into the area of the end of the projection lens 31 when viewed from the horizontal bar 2x in the horizontal shift plate 1b. In other words, the adjusting screw 9z is disposed such that the optical axis of the projection lens 31 passes between itself and the horizontal bar 2x.

  As shown in the front view of FIG. 7, when the adjusting screw 9z is rotated, the attitude of the vertical bar 2z can be rotated for each horizontal shift plate 1b (with the horizontal bar 2x as the center of rotation).

  Thereby, as shown in the left side view of FIG. 7, a direction parallel to the short side direction of the panel plane 101 from the vertical shift direction 1z ′ (indicated by a broken line in the left side view of FIG. 7) before adjustment. It can be adjusted to 1z (shown by a solid line in the left side view of FIG. 7).

  The tip of the adjusting screw 9z has a spherical shape (convex curved surface shape), and is configured to abut on the fixing member 1a at one point (point contact). In other words, the contact area between the adjusting screw 9z and the fixing member 1a does not change by the adjustment by the second adjusting mechanism.

  The adjusting screw 9z is biased by the plate spring 8 toward the fixing member 1a in the negative direction of the y direction through the horizontal shift plate 1b, the vertical bar 2z, and the vertical shift plate 1c, so that it abuts against the fixing member 1a You can keep it

  Hereinafter, the adjustment process of the shift direction using the first and second adjustment mechanisms is referred to as a first adjustment process.

(Third adjustment mechanism and mechanism)
Next, the tilt adjustment of the projection lens 31 is performed so that the optical axis of the projection lens 31 is perpendicular to the panel plane 101. At the same time, the distance between the mounting surface 31 a of the projection lens 31 and the panel plane 101 is adjusted. Hereinafter, this adjustment mechanism is referred to as a third adjustment mechanism and will be described with reference to FIG.

  A falling adjustment screw (sliding member) 11z1 is screwed into two positions (two spaced apart positions) of the vertical shift plate 1c so as to protrude toward the vertical bar 2z. The tip of the fall adjustment screw 11z1 has a spherical shape, and the vertical shift plate 1c is biased in the optical axis direction by the plate spring 8, so the end of the fall adjustment screw 11z1 makes point contact with the vertical bar 2z. The tilt (tilt around the x axis with respect to the optical axis) of the projection lens mounting surface of the vertical shift plate 1c is adjusted according to the amount of protrusion of the two tilt adjustment screws 11z1.

  Further, in the vertical shift plate 1c, a tilt adjustment screw 11z2 is screwed in a region beyond the projection lens 31 as viewed from the tilt adjustment screw (sliding member) 11z1 so as to protrude toward the horizontal shift plate 1b. In other words, (the optical axis of) the projection lens 31 is configured to pass through the portion surrounded by the fall adjustment screws 11z1 (2 places) and 11z2. The tip of this fall adjustment screw 11z2 is also spherical in shape. The fall adjustment screw 11z2 adjusts the inclination of the vertical shift plate 1c around the vertical bar 2z (z axis).

  That is, the optical axis of the projection lens 31 can be adjusted to be perpendicular to the panel plane 101 by appropriately rotating the fall adjustment screws 11z1 (2 places) and 11z2 (see the front view of FIG. 8).

  The fall adjustment process using the above third adjustment mechanism is hereinafter referred to as a second adjustment process. One of the features of the adjustment process in this embodiment is that this second adjustment process is performed independently of the above-mentioned first adjustment process.

  Furthermore, at this time, the distance (flange back) of the mounting surface 31 a of the projection lens from the panel plane 101 is also finely adjusted by the third adjustment mechanism. The flange back adjustment process which is also used as the third adjustment mechanism is hereinafter referred to as a third adjustment process.

  The left side view of FIG. 8 shows a state before and after adjustment. The left side view after adjustment indicates that the distance from the panel plane 101 to the surface close to the panel of the projection lens 31 has been adjusted in the negative direction of the y direction.

(effect)
After the shift directions of the panel plane 101 and the lens shift mechanism 1 are adjusted in parallel by the above adjustment process (first adjustment process), the optical axes of the panel plane 101 and the projection lens 31 are perpendicular independently of this Can be adjusted to fall (second adjustment process). Furthermore, the distance (flange back) between the panel plane 101 and the mounting surface 31 a of the projection lens 31 can be optimized (third adjustment process).

  Therefore, according to the configuration of the present embodiment, it is possible to provide a projector in which the optical axis of the projection lens is not inclined in the entire movable range of the lens shift mechanism 1 and the flange back fluctuation is also small. That is, it is possible to provide a high resolution projector over the entire movable range of the lens shift mechanism 1.

  Further, in the present embodiment, the fixing member 1a holds the horizontal shift plate 1b at a total of three points of two points on the horizontal bar 2x and one point (point contact) on the sliding portion of the adjusting screw 9z. With this configuration, only one horizontal bar 2x is required, and the sliding resistance can be reduced during lens shift in the horizontal direction. Further, since the lens is held at three points, the attitude of the horizontal shift plate 1b can reduce rattling at the time of lens shift, and an effect of stabilizing can be obtained.

  Similarly, in the present embodiment, the horizontal shift plate 1b holds the vertical shift plate 1c at a total of three points: two points in the vertical bar 2z and one point (point contact) in the sliding portion of the fall adjustment screw 11z2. With this configuration, only one vertical bar 2z is required, and the sliding resistance can be reduced when shifting the lens in the vertical direction. Further, since the lens is held at three points, the attitude of the vertical shift plate 1c can reduce the rattling at the time of lens shift, and the effect of stabilizing can be obtained.

  In addition, although it is preferable to comprise like these from a viewpoint of sliding resistance, the number of horizontal bars does not need to be one.

  Also, the vertical shift plate 1c for holding the projection lens 31 and the vertical bar 2z for guiding the third adjustment mechanism configured by the two fall adjustment screws 11z1 and one fall adjustment screw 11z2 as in this embodiment. Provided in These are provided closer to the projection surface 107 (see FIG. 1) than the lens shift mechanism (closest to the projection surface 107 in the adjustment mechanism). With this configuration, the third adjustment mechanism can be accessed from the side of the projection surface 107 (from the optical axis direction of the projection lens 31) (a part of the third adjustment mechanism is exposed from the exterior member).

  With this configuration, for example, even if the exterior member is assembled, it is possible to finely adjust such as falling down and flange back, and the convenience is high. The present invention can be practiced even if the fall adjustment mechanism is provided on the panel side relative to the shift mechanism, for example, like the fixing member 1a.

  Further, in the present embodiment, the optical axis of the projection lens 31 passes between the horizontal bar 2x holding the horizontal shift plate 1b and the adjusting screw 9z. More specifically, the optical axis of the three points (two at the horizontal bar 2x and one at the sliding portion of the adjusting screw 9z) holding the horizontal shift plate 1b is arranged in a triangular shape passing through the inside thereof There is.

  Similarly, the optical axis of the projection lens 31 passes between the vertical bar 2z holding the vertical shift plate 1c and the fall adjustment screw 11z2. More specifically, the three points (two at the vertical bar 2z and one at the sliding portion of the fall adjustment screw 11z2) holding the vertical shift plate 1c are arranged in a triangular shape with the optical axis passing through the inside ing.

  With such an arrangement, it is possible to configure a lens shift mechanism with a stable posture around the optical axis and a small sliding resistance.

  Further, in the lens shift mechanism in the present embodiment, the tips of the slide members of the adjustment screw 9z and the fall adjustment screws 11z1 and 11z2 are directed to the opposing member (the horizontal shift plate 1b or the fixing member 1a in the present embodiment) And has a convex curved surface shape. Therefore, even if these attitude | positions change by adjustment, point contact can be maintained (the same contact area can be maintained) and sliding resistance can be suppressed.

(Modification)
In this embodiment, an example of a projector having a mechanism capable of adjusting the inclination of the projection lens 31 and the flange back as the third adjustment mechanism has been described. However, the third adjustment mechanism may be configured of a mechanism that performs fall adjustment and a mechanism that performs flange back adjustment independent of this.

  In addition, although it is desirable to simultaneously perform flange back adjustment in the third adjustment mechanism, the effect of the present invention can be obtained even with the configuration of only the fall adjustment mechanism. In this case, flange back adjustment may be performed using the first and second adjustment mechanisms (adjustment is possible also in the configuration of the present embodiment). As described above, it is desirable that the flange back adjustment be adjustable independently of the adjustment of the shift direction, but the effect of the present invention can be obtained by using an adjustment mechanism common to the shift direction.

  Alternatively, for example, after rough adjustment of the flange back is performed using the first and second adjustment mechanisms, fine adjustment of the flange back may be performed again using the third adjustment mechanism.

  Further, in the present embodiment, (the parts of the projector) having the shift mechanism (not limited to the configuration of the present embodiment) are prepared, and the adjustment in the shift direction (first adjustment process) is performed first. Thereafter, fall adjustment (second adjustment process) and flange back adjustment (third adjustment process) are performed. By adjusting in this manner (in order), the fall adjustment and flange back adjustment (fine adjustment) in the post process can be adjusted after assembling the exterior member or in the middle of assembling. Therefore, the flange back fluctuation generated by the shift mechanism can be finally adjusted in a state closer to the product state, and the convenience is also high. For example, rough adjustment of the flange back may be performed at the time of adjustment of the shift direction, and fine adjustment of the flange back may be performed at the time of inclination adjustment, and the implementation timing of the third adjustment process is not limited.

(Example 2)
The present embodiment shows a configuration in which the adjustment screw 9z of the lens shift mechanism 1 and the inclination adjustment screw 11z2 of the projection lens attachment surface shown in the first embodiment are modified. The same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

(Configuration of Example 2)
FIG. 9 shows a lens shift mechanism according to this embodiment. 9 (a) is a schematic view of the lens shift mechanism 1, FIG. 9 (b) is a sectional view taken along the line B-B in FIG. 9 (a), and FIG. 9 (c) is a sectional view taken along the line C-C in FIG. It shows.

  The configuration of the tilt adjustment screw 11z2 of the projection lens mounting surface according to the present embodiment will be described with reference to FIGS. 9 (b) and 9 (c).

  A hole 1c3 is formed in the vertical shift plate 1c at the position where the fall adjustment screw 11z2 is installed (see FIG. 9 (b)). The sliding member 12 is inserted into the hole 1c3.

(Structure of sliding member)
The sliding member 12 has a cylindrical contact member 12a fitted in a fitting hole 1c4 formed in the shift plate 1c.

  The sliding member 12 is provided with a flange (flange portion) 12 on the projection surface side (left direction in FIG. 9B) of the contact member 12a. An internally threaded portion 12d is formed at the center of the collar 12c. A sliding portion 12e is provided at a portion of the other end (rightward in FIG. 9B) in the axial direction with respect to the collar 12c.

  In addition, a key (key portion) 12b is formed on part of the side surface of the contact member 12a. The key 12b regulates the rotation of the sliding member 12 (around the axis of the contact portion 12a) by the key groove 1c5 formed in the vertical shift plate 1c.

  An adjustment screw (adjustment member) 13 is screwed into the female screw portion 12 d. The collar 13a of the adjusting screw 13 is (in a rotatable manner) held in the gap formed by the holding plate 14 and the holding plate 15, and the adjusting screw can be rotated at a fixed position in the optical axis direction.

  The holding sheet metal 14 is fixed to the holding sheet metal 15 on the projection surface side (left direction in FIG. 9B) by fixing screws 4m and 4n. An adjustment hole 14 a is formed in the holding metal plate 14 in order to rotate the adjustment screw 13 using a tool such as a screwdriver.

  A compression spring 16 is provided between the vertical shift plate 1 c and the sliding member 12 to urge the sliding member 12 and the adjustment screw 13 collectively to the holding plate metal 14. As shown in FIG. 9A, since the vertical shift plate 1c is biased by the plate spring 8 toward the horizontal shift plate 1b, the sliding portion 12e in contact with the horizontal shift plate 1b is shifted horizontally. It can be held without leaving the plate 1b.

  As shown in FIG. 9C, the sliding portion 12e has a long shape in the driving direction (vertical direction in FIG. 9C) of the vertical shift plate 1c.

  The adjustment screw 9z according to the present embodiment also has the same configuration as the inclination adjustment screw 11z2 of the projection lens attachment surface described above. That is, the vertical shift plate 1c in the description of the fall adjustment screw 11z2 of the projection lens attachment surface is replaced with the horizontal shift plate 1b, and the horizontal shift plate 1b is replaced with the fixing member 1a.

(How to adjust)
The adjustment method is the same process as in the first embodiment, and the adjustment screw 9x, the adjustment screw 9z, the inclination adjustment screw 11z1 of the projection lens attachment surface, and the inclination adjustment screw 11z2 of the projection lens attachment surface shown in FIG. Do. By adjusting these screws, the driving directions of the panel plane 101 and the lens shift mechanism 1 and the mounting surface 31a of the projection lens can all be brought close to parallel. Furthermore, the distance (flange back) between the panel plane 101 and the mounting surface 31a of the projection lens can be optimized.

(effect)
By adopting the above-described configuration, the long side of the rectangle, which is the outer shape of the sliding portion 12e, can be kept unchanged in parallel with the sliding direction, regardless of whether the lens is shifted or the falling is being adjusted. . By maintaining this relationship, the sliding performance can be obtained without change even after the fall adjustment. It is clear from experiments conducted by the inventor of the present invention that when the sliding portion 12e has a sliding direction in the long side (longitudinal direction), good sliding performance can be obtained.

  As mentioned above, although the preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1 Lens shift mechanism 1a Fixing member (Fixing member)
1b Horizontal shift plate (intermediate moving member)
1c Vertical shift plate (holding member)
1x horizontal shift direction (first direction)
1z vertical shift direction (second direction)
2x horizontal bar (first guide)
2z vertical bar (second guide)
9x adjustment screw 9z adjustment screw (sliding member)
11z1, 11z2 Falling adjustment screw (sliding member)
12 contact member 13 adjustment member 31 projection lens 31 a projection lens mounting surface 101 reflection type liquid crystal panel

Claims (18)

A light modulation element to which light from a light source is irradiated;
A holding member for holding a projection optical system that projects the light from the light modulation element;
A shift mechanism for moving the holding member in a direction intersecting the optical axis of the projection optical system;
An adjustment mechanism that changes the moving direction of the projection optical system by the shift mechanism;
An adjustment mechanism capable of changing the inclination of the surface of the projection optical system held independently of the change of the shift direction of the adjustment mechanism. 2. The projection type display device according to claim 1, further comprising: an adjusting mechanism capable of changing a distance between a surface of the projection optical system to be held and a surface of the light modulation element. The moving direction of the projection optical system by the shift mechanism can be changed so as to be perpendicular to the traveling direction of light emitted in the normal direction of the light modulation element. The projection display device according to 1 or 2. The inclination of the optical axis of the projection optical system can be changed to be inclined in the same direction as the traveling direction of the light emitted in the normal direction of the light modulation element. The projection display device according to any one of the above. The shift mechanism
A fixing member for movably holding the holding member;
An intermediate moving member movably holding the holding member and movably held by the fixed member;
A first guide portion for guiding the intermediate moving member in the first direction; and a second guide portion for guiding the holding member in the second direction,
It is possible to move the holding member in the first direction and the second direction which are different from each other in the direction crossing the optical axis of the projection optical system,
The adjustment mechanism
First and second adjustment mechanisms that can be changed such that the first and second directions are perpendicular to the traveling direction of the light emitted in the normal direction of the light modulation element, respectively;
The inclination of the surface held by the projection optical system can be changed to be perpendicular to the traveling direction of the light emitted in the normal direction of the light modulation element, and between the surface and the surface of the light modulation element The projection type display apparatus according to any one of claims 1 to 4, further comprising: a third adjustment mechanism capable of changing the distance. The first guide portion is fixed to the fixed member, extends in the first direction, and slidably holds the intermediate moving member.
The first adjustment mechanism is configured to change an inclination of the first guide portion with respect to the fixing member,
The second guide portion is fixed to the intermediate moving member, extends in the second direction, and slidably holds the holding member.
The second adjustment mechanism is a sliding member which is provided on the intermediate moving member, protrudes relative to the fixed member, is biased, and slides, and is configured to change the amount of projection of the sliding member. 6. The projection type display device according to claim 5, wherein the second direction is changed by rotating the intermediate moving member around the first guide portion. 7. The projection type display device according to claim 5, wherein an optical axis of the projection optical system passes between the first adjustment mechanism and the second adjustment mechanism. The first adjustment mechanism is screwed in at both end portions of the first guide portion and biased by the fixing member, and a distance between the first guide portion and the fixing member is the light An adjustable screw that can be changed in the axial direction
7. The projection type display device according to claim 6, wherein an optical axis of the projection optical system passes through a portion surrounded by the adjusting screw and the sliding member. The projection display according to any one of claims 5 to 8, wherein the third adjustment mechanism is provided to the holding member and the second guide portion. 10. The third adjustment mechanism according to claim 5, wherein the third adjustment mechanism is a sliding member screwed to the holding member and biased by the intermediate moving member or the second guide portion. The projection-type display apparatus as described in any one. The third adjustment mechanism is composed of three or more sliding members,
11. The projection type display device according to claim 10, wherein an optical axis of the projection optical system passes through a portion surrounded by the third adjustment mechanism. The projection display according to any one of claims 6 to 11, wherein an area of a surface of the sliding member in contact with the intermediate moving member or the fixing member does not change due to the movement of the sliding member. apparatus. The projection display apparatus according to claim 12, wherein the sliding member is in contact with the intermediate moving member or the fixing member with a convex curved surface. The sliding member is
An abutting member having a cylindrical shape, a key portion on the side surface of the cylindrical shape, a female screw portion on one end in the axial direction, and a sliding portion on the other end to be in contact with the intermediate moving member or the fixing member; ,
An adjusting member screwed with the female screw and rotatable at a fixed position in the optical axis direction;
And have
The projection display apparatus according to claim 12, wherein the sliding portion has a long side in the sliding direction. The part of said 3rd adjustment mechanism is exposed from the exterior member of the said projection type display apparatus in the optical axis direction of the said projection optical system in any one of the Claims 5 thru | or 14 characterized by the above-mentioned. The projection type display device as described. A method of adjusting a projection optical system of a projection type display device,
A light modulation element to which light from a light source is irradiated, a holding member holding a projection optical system for projecting the light from the light modulation element, and the holding member moving in a direction crossing the optical axis of the projection optical system Preparing a projection type display device having a shift mechanism for adjusting the shift direction, an adjustment mechanism for the shift direction, and an adjustment mechanism for the inclination of the surface on which the projection optical system is held and the distance between the surface and the light modulation element When,
A first adjustment process of adjusting the shift direction using an adjustment mechanism of the shift direction;
And a second adjustment process of adjusting the tilt of the surface of the projection optical system to be held.
The adjustment method of a projection type display device, wherein the first and second adjustment processes are performed independently. 17. A method according to claim 16, wherein the second adjustment process is performed after the first adjustment process. 18. The adjustment method according to claim 16, further comprising: a third adjustment process of adjusting the distance between the light modulation element and the held surface of the projection optical system.

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