JP5074603B2 - Lens moving mechanism and liquid crystal projector - Google Patents

Description

  The present invention relates to a lens moving mechanism that holds and moves a lens barrel of a liquid crystal projector, and a liquid crystal projector that includes the lens moving mechanism.

  FIG. 1 is a diagram showing a configuration example of a conventional liquid crystal projector. In the figure, 1 is a light source comprising a metal halide lamp, 2, 3 is a dichroic mirror for separation, 4, 5 is a reflection mirror, 6, 7, 8 are liquid crystal panels, 9, 10 are dichroic mirrors for photosynthesis, 11 is An optical path adjusting mechanism 13 constituted by a pair of liquid crystal prisms 12A and 12B, 13 is a projection lens, and these are all mounted in the projector housing 14.

  The light emitted from the light source 1 is split into three primary colors of red (R), blue (B), and green (G) by the dichroic mirrors 2 and 3. The transmittance of the dispersed light is modulated in the liquid crystal panels 6, 7, and 8 on each optical path according to the image information of each color component. The modulated light is synthesized by the dichroic mirrors 9 and 10. Then, after the optical path is adjusted by the optical path adjusting mechanism 11, the combined light is enlarged and projected on a screen (not shown) by the projection lens 13.

  In the conventional liquid crystal projector, since the optical path adjusting mechanism 11 is provided in front of the projection lens 13, the distance between the liquid crystal panels 6, 7, 8 and the projection lens 13 in the liquid crystal projector (for example, the liquid crystal panel 6). In this case, it is necessary to lengthen the distance m) in FIG. 1 by the optical path adjusting mechanism 11, which is not suitable for downsizing.

  Further, the light having image information transmitted through the liquid crystal panels 6, 7, and 8 is projected by the projection lens 13 through a large number of glass plates constituting the liquid crystal prisms 12 </ b> A and 12 </ b> B of the optical path adjusting mechanism 11, and is enlarged and displayed on the screen. Therefore, the large number of glass plates increase image distortion of the projected image on the screen, distortion of chromatic aberration, and the like, and there is a problem that a high-definition image cannot be displayed.

  Further, in order to solve the problem that it is not suitable for the above-mentioned miniaturization, the image distortion of the projected image, the distortion of chromatic aberration, etc., and the problem that a high-definition image cannot be displayed, for example, Patent Document 1 shows. In this way, a lens barrel moving mechanism is provided, and the lens barrel with a projection lens inside is moved in a direction perpendicular to the projector housing, resulting in large downsizing, image distortion, chromatic aberration distortion, etc. There is also a liquid crystal projector having a configuration in which an optical path adjusting mechanism that is a factor that cannot display a fine image is removed. By configuring the liquid crystal projector in this way, it is possible to reduce the size and to perform shift adjustment or tilt adjustment of the projected image without causing image distortion and chromatic aberration distortion in the projected image.

Japanese Patent Laid-Open No. 6-331953

  The present invention further improves the lens barrel moving mechanism of the liquid crystal projector from which the optical path adjusting mechanism is removed, has a simple structure, allows the lens barrel to move smoothly, and allows the lens barrel to move with high precision, and the An object is to provide a liquid crystal projector using a lens moving mechanism.

  In order to solve the above-described problem, the invention according to claim 1 is a lens holding member that holds a lens barrel that includes a projection lens that projects light having image information, and the lens holding member is used as an optical axis of light. A lens holding member guide means that is movable perpendicularly to the first and second biaxial directions perpendicular to each other, a fixed support member that supports the lens holding member guide means, and a lens barrel. The lens moving mechanism includes a driving force applying unit that applies a driving force for moving in the first or second direction, wherein the fixed-side support member is on both the left and right sides in a direction orthogonal to the optical axis of the lens holding member. And a support frame having a side facing the lens holding member on the lower side, and the lens holding member guide means is orthogonal to the first guide means and the optical axis for guiding the lens barrel in a first direction orthogonal to the optical axis. And the first direction and Second guide means for guiding in the intersecting second direction, the first guide means is disposed between the inner walls of the left and right sides of the support frame and the lens holding member facing the inner walls of the left and right sides, and the second guide means A first support means disposed between the lower inner wall of the support frame and the lens holding member facing the lower inner wall, and between the first guide means and the first guide means facing the upper portion of the lens holding member, The guide means and the second guide means each have a raceway member provided with rolling element rolling surfaces along the longitudinal direction, and a rolling element rolling surface corresponding to the rolling element rolling surface of the raceway member. A moving member incorporated in a member so as to be freely movable relative to the member; a rolling element rolling surface of the raceway member; and a plurality of rolling elements arranged between the rolling element rolling surface of the moving member; The track member and the moving member respectively provided in the second guide means are in the optical axis direction of light. They are arranged at the same position, and the width direction of the track member and the moving member of the lens holding member guide means is substantially coincident with the optical axis, and the rolling elements of the lens holding member guide means and the rolling elements of the track member and moving member are rotated. Outer rail with preload applied between the running surfaces, the raceway member is made of a plate-shaped material, and the cross-sectional shape perpendicular to the longitudinal direction is substantially U-shaped and the rolling element rolling surfaces are provided on both inner sides in the width direction The moving member is an inner rail made of a plate-like material and having a substantially U-shaped cross-sectional shape perpendicular to the longitudinal direction and provided with rolling element rolling surfaces on both outer sides in the width direction. It is a ball | bowl and comprises the rolling element holder | retainer which hold | maintains each rolling element rotatably.

  As described above, the fixed-side support member includes support frames having sides facing the lens holding member on both the left and right sides and the lower side in a direction orthogonal to the optical axis of the lens holding member. A first guide means for guiding the lens barrel in a first direction orthogonal to the optical axis; and a second guide means for guiding the lens barrel in a second direction orthogonal to the optical axis and perpendicular to the first direction. Is arranged between the left and right side inner walls of the support frame and the lens holding member facing the left and right side inner walls of the support frame, and the second guide means includes a lower side inner wall of the support frame and a lower side of the support frame. The first guide means and the second guide means are arranged in the longitudinal direction between the lens holding members facing the inner side wall and between the first guide means and the first guide means facing the upper portion of the lens holding member. A raceway member provided with rolling element rolling surfaces along the raceway, and the raceway member rolling surface. A rolling member rolling surface corresponding to the body rolling surface is provided, and is incorporated between the rolling member rolling surface of the rolling member and the rolling member rolling surface of the moving member. A plurality of rolling elements arranged, and the track member and the moving member respectively provided by the first guide unit and the second guide unit are disposed at substantially the same position in the optical axis direction of the light. Since the relative movement of the moving member is smooth via the rolling elements, the movement of the projection lens is also smooth, and the lens moving mechanism can be configured thin in the direction of the optical axis, and the size can be reduced. The width direction of the track member and the moving member of the lens holding member guide means is substantially coincident with the optical axis, and the preload is applied between the rolling element of the lens holding member guide means and the rolling element rolling surface of the track member and moving member. Because of this, the rigidity against rotational moment in the direction perpendicular to the optical axis direction is increased, and the heavy lens barrel can be supported with strong rigidity, and the lens barrel can be moved with high accuracy and smoothly. Is possible. The track member is an outer rail made of a plate-like material, and has a substantially U-shaped cross section perpendicular to the longitudinal direction, and has rolling element rolling surfaces on both inner sides in the width direction. A rolling element that is made of a material and has an approximately U-shaped cross-section perpendicular to the longitudinal direction and is provided with rolling element rolling surfaces on both outer sides in the width direction, and each of the rolling elements is rotatably held. Since the structure includes a cage, the outer rail and the inner rail can be easily formed by, for example, pressing a steel plate, and inexpensive rolling balls can be used. Therefore, it can be manufactured at a relatively low cost, and the cost can be reduced.

  According to a second aspect of the present invention, there is provided a lens holding member that holds a lens barrel that includes a projection lens that projects light having image information, the lens holding member being orthogonal to the optical axis of light, and A lens holding member guiding means for movably guiding the first and second biaxial directions orthogonal to each other, a fixed support member for supporting the lens holding member guiding means, and the lens barrel in the first or second direction. And a driving force applying means for applying a driving force for moving the lens to the left and right sides of the lens holding member in the direction perpendicular to the optical axis of the lens holding member and the lower side thereof. The lens holding member guide means includes a first guide means for guiding the lens barrel in a first direction orthogonal to the optical axis, and is orthogonal to the optical axis and the first direction. Guide in the second direction perpendicular to Second guide means is arranged between the inner walls of the left and right sides of the support frame and the lens holding member facing the inner walls of the left and right sides, and the second guide means is the lower side of the support frame. The first guide means and the second guide means are arranged between the inner wall and the lens holding member facing the lower side inner wall and between the first guide means and the first guide means facing the upper portion of the lens holding member. Are each provided with a raceway member provided with rolling element rolling surfaces along the longitudinal direction, and a rolling element rolling surface corresponding to the rolling element rolling surface of the raceway member, and is incorporated in a freely movable manner relative to the raceway member. And a plurality of rolling elements disposed between the rolling element rolling surface of the raceway member and the rolling element rolling surface of the moving member, and the first guiding means and the second guiding means respectively. The track member and the moving member are arranged at substantially the same position in the optical axis direction of the light. The width direction of the track member and the moving member of the lens holding member guide means is substantially coincident with the optical axis, and the preload is applied between the rolling element of the lens holding member guide means and the rolling element rolling surface of the track member and moving member. The track member is composed of a track rail provided with a moving body rolling surface on both sides in the width direction, and the moving member has an infinite circuit including a rolling element rolling surface corresponding to the rolling body rolling surface of the track rail. It comprises a moving block provided, and the rolling elements are balls, which are arranged and accommodated in an infinite circulation path, and circulate with the relative movement of the track rail and the moving block.

  As described above, the track member is composed of a track rail provided with rolling element rolling surfaces on both sides in the width direction, and the moving member is an infinite circuit including a rolling element rolling surface corresponding to the rolling element rolling surface of the track rail. The rolling elements are balls and are arranged and accommodated in an infinite circuit and circulate with the relative movement of the track rail and the moving block. Becomes extremely smooth, and the lens barrel can be moved more smoothly. In addition, since pressure is applied between the rolling elements of the lens holding member guide means composed of the track rail and the moving block and the rolling element rolling surfaces of the track member and the moving member, the rigidity is large and the lens barrel is firmly supported. Therefore, the lens barrel can be moved with higher accuracy than the lens moving mechanism according to the first aspect.

  According to a third aspect of the present invention, the lens moving mechanism according to the first or second aspect and a projector housing having a liquid crystal panel therein are provided, and the lens moving mechanism emits light having image information from the liquid crystal panel. It is characterized by being configured to project onto a holding projection lens.

  Since the liquid crystal projector is provided with the lens moving mechanism according to the first or second aspect as described above, the liquid crystal projector is small and does not generate image distortion and chromatic aberration distortion in the projected image.

  According to the first aspect of the present invention, the fixed-side support member includes support frames having sides facing the lens holding member on both the left and right sides and the lower side in a direction orthogonal to the optical axis of the lens holding member. The holding member guide means includes first guide means for guiding the lens barrel in a first direction orthogonal to the optical axis, and second guide means for guiding the lens barrel in a second direction orthogonal to the optical axis and orthogonal to the first direction. The first guide means is disposed between the inner walls of the left and right sides of the support frame and the lens holding member facing the inner walls of the left and right sides, and the second guide means is the lower side inner wall of the support frame and the lower side The first guide means and the second guide means are disposed in the longitudinal direction between the lens holding members facing the inner wall and between the first guide means and the first guide means facing the upper portion of the lens holding member. A raceway member provided with rolling element rolling surfaces along the raceway member, A rolling member rolling surface corresponding to the rolling member rolling surface is provided and incorporated in a freely movable relative to the race member, and between the rolling member rolling surface of the race member and the rolling member rolling surface of the moving member. A plurality of rolling elements arranged, and the track member and the moving member respectively provided in the first guide means and the second guide means are arranged at substantially the same position in the optical axis direction of the light, and the lens holding member guide The width direction of the track member and the moving member of the means substantially coincides with the optical axis, and a preload is applied between the rolling element of the lens holding member guide means and the rolling element rolling surface of the track member and the moving member. The moving mechanism is thin in the optical axis direction and can be miniaturized, and supports a highly rigid and heavy lens barrel against a rotational moment in a direction perpendicular to the optical axis direction, and can move the lens barrel with high accuracy and smoothly. Provide a lens movement mechanism that can That. In addition, since the track member and the moving member are outer rails and inner rails made of a plate material, it can be easily formed by, for example, pressing a steel plate, and the rolling element is also an inexpensive commercially available ball. Can be manufactured at a relatively low cost, and the cost can be reduced.

  According to the second aspect of the present invention, the track member of the lens holding member guide means includes the track rail provided with rolling element rolling surfaces on both sides in the width direction, and the moving member is the rolling element rolling surface of the track rail. The rolling block includes an infinite circulation path including a rolling element rolling surface, and the rolling element balls are arranged and accommodated in the infinite circulation path and circulate with the relative movement of the track rail and the movement block. With this configuration, the relative movement of the track rail and the moving block becomes extremely smooth, the lens barrel can be moved more smoothly, and the lens holding guide means comprising the track rail and the moving block is orthogonal to the optical axis direction. It is possible to provide a lens moving mechanism that is more rigid with respect to the rotational moment in the direction and that firmly supports the lens barrel and can be moved with high accuracy.

  According to the invention described in claim 3, since the liquid crystal projector includes the lens moving mechanism described in claim 1 or 2, the liquid crystal projector is small and does not generate image distortion and chromatic aberration distortion in the projected image. A liquid crystal projector can be provided.

It is a figure which shows the structural example of the conventional liquid crystal projector. It is a figure which shows the structure of the liquid-crystal projector using the lens moving mechanism which concerns on this invention. 1 is a schematic external perspective view showing a configuration example of a lens barrel moving mechanism (first embodiment) of a lens moving mechanism according to the present invention. It is a front view which shows the structural example of the lens-barrel moving mechanism (1st Example) of the lens moving mechanism which concerns on this invention. It is A1-A1 arrow sectional drawing of FIG. It is B1-B1 arrow sectional drawing of FIG. It is a figure which shows the structure of a 1st guide mechanism, Fig.7 (a) is a partially cutaway perspective view, FIG.7 (b) is CC sectional view taken on the line. It is a front view of the fixed side support member of a lens barrel moving mechanism. It is a front view of the intermediate member of a lens barrel moving mechanism. It is a front view of the lens holding member of a lens barrel moving mechanism. It is a figure which shows the structural example of the drive force provision mechanism of a 1st guide mechanism, FIG.11 (a) is the figure seen from the downward | lower direction, FIG.11 (b) is a front view. It is a front view which shows the structural example of the lens-barrel moving mechanism (2nd Example) of the lens moving mechanism which concerns on this invention. It is A2-A2 arrow sectional drawing of FIG. It is B2-B2 arrow sectional drawing of FIG. It is a partially cutaway perspective view of the principal part of a 1st guide mechanism. It is a partially cutaway side view of the 1st guide mechanism of FIG. FIG. 16 is a partially cutaway front view of the first guide mechanism of FIG. 15.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a configuration example of a liquid crystal projector as a first embodiment using the lens moving mechanism according to the present invention. 2, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. The liquid crystal projector moves the lens barrel 15 in the left-right direction (X-axis direction) and the up-down direction (Z-axis direction) with respect to the projector housing 14 outside the lens barrel 15 that houses the projection lens 13. A lens barrel moving mechanism 16 having a configuration described in detail later is provided. Further, a glass plate 17 is attached in the lens barrel 15 so as to close the light exit of the lens barrel 15 on the light exit side of the projection lens 13. A glass plate rotating mechanism that rotates the glass plate 17 around a first rotating shaft extending in the left-right direction (X-axis direction) and a second rotating shaft extending in the up-down direction (Z-axis direction) is provided outside the lens barrel 15. 18 is provided.

  3 to 6 are diagrams showing a configuration example of the lens barrel moving mechanism 16. FIG. 3 is a schematic external perspective view, FIG. 4 is a front view, and FIG. 5 is a cross-sectional view taken along arrow A1-A1 in FIG. 6 is a cross-sectional view taken along arrow B1-B1 in FIG. The lens barrel moving mechanism 16 includes a lens holding member 20 that holds the lens barrel 15, a fixed side support member 21, an intermediate member 22 that relays the lens holding member 20 and the fixed side support member 21, and a lens holding member. A lens holding member guide mechanism for moving 20 in the vertical direction (Z-axis direction) and the horizontal direction (X-axis direction) is provided. The lens holding member guide mechanism is provided between the first guide mechanisms 23 and 23, which will be described in detail after being provided between the fixed support member 21 and the intermediate member 22, and between the intermediate member 22 and the lens holding member 20. And second guide mechanisms 24 and 24 which will be described in detail later.

  7A and 7B are diagrams showing the configuration of the first guide mechanism 23, in which FIG. 7A is a partially cutaway perspective view, and FIG. 7B is a cross-sectional view taken along the line CC. In FIG. 7, reference numeral 23-1 denotes an outer rail as a track member, and reference numeral 23-2 denotes an inner rail that is incorporated in the outer rail 23-1 so as to be movable relative to the outer rail 23-1. 3 is a ball as a rolling element that rolls between the outer rail 23-1 and the inner rail 23-2, and 23-4 is a large number of balls 23-3 between the outer rail 23-1 and the inner rail 23-2. It is a retainer as a ball holder that holds and arranges at predetermined intervals.

  The outer rail 23-1 is made of a plate-shaped material and has a substantially U-shaped cross-sectional shape perpendicular to the longitudinal direction, and is provided with rolling element rolling surfaces 23-1a along the longitudinal direction on both inner sides in the width direction. It is a configuration. The inner rail 23-2 is made of a plate-shaped material, and has a substantially U-shaped cross-sectional shape perpendicular to the longitudinal direction, and is provided with rolling element rolling surfaces 23-2a along the longitudinal direction on both outer sides in the width direction. It is a configuration. The rolling element rolling surface 23-1a of the outer rail 23-1 and the rolling element rolling surface 23-2a of the inner rail 23-2 correspond to each other, and a large number of balls 23-3 are formed between both rolling element rolling surfaces. The retainer 23-4 is rotatably held.

  Although not shown, the second guide mechanism 24 has the same configuration as the first guide mechanism 23, and includes an outer rail 24-1, an inner rail 24-2, a ball 24-3, and a retainer 24-4. .

  As shown in FIG. 5, the outer rails 23-1 and 23-1 of the first guide mechanisms 23 and 23 are fixed to both inner sides in the left and right direction (X-axis direction) of the fixed-side support member 21, 23-2 is fixed to both ends of the intermediate member 22 in the left-right direction. Further, as shown in FIG. 6, the outer rails 24-1 and 24-1 of the second guide mechanisms 24 and 24 are fixed to the inner side of the intermediate members 22 and 22 on the inner side in the vertical direction (Z-axis direction). , 24-2 are fixed to the outside of the lens holding member 20 in the vertical direction.

  The inner rails 23-2 and 23-2 of the first guide mechanisms 23 and 23 are moved vertically with respect to the outer rails 23-1 and 23-1 by a driving force applying mechanism which will be described in detail later, thereby holding the lens. The member 20, that is, the lens barrel 15 moves in the vertical direction. The lens holding member 20 is moved by moving the inner rails 24-2 and 24-2 of the second guide mechanisms 24 and 24 with respect to the outer rails 24-1 and 24-1 in the left-right direction with a driving force applying mechanism (not shown). That is, the lens barrel 15 moves in the left-right direction.

  As described above, the lens holding member guide mechanism includes the outer rail 23-1 and the inner rail 23-2, the first guide mechanisms 23 and 23 for guiding the lens holding member 20 in the vertical direction, and the outer rail 24-1. And the inner rail 24-2, and the second guide mechanisms 24, 24 for guiding the lens holding member 20 in the left-right direction, the outer rail 23-1, the first guide mechanisms 23, 23, The movement of the inner rails 23-2 and 23-2 with respect to 23-1 is smoothly performed via the balls 23-3 and 23-3, and the second guide mechanisms 24 and 24 with respect to the outer rails 24-1 and 24-1. Since the inner rails 24-2 and 24-2 move smoothly through the balls 24-3 and 24-3, the movement becomes smooth, and the lens barrel 15 also moves. The smooth ones.

  The outer rails 23-1, 24-1 and the inner rails 23-2, 24-2 can be easily formed by, for example, pressing a steel plate, and the balls are also commercially available. Can be purchased and used, so that it can be manufactured at a relatively low cost and the cost can be reduced.

  Further, here, the outer rails 23-1, 23-1, 24-1, 24-1 and the inner rails 23-2, 23-2 included in the first guide mechanisms 23, 23 and the second guide mechanisms 24, 24, respectively. , 24-2 and 24-2 are arranged at substantially the same position in the optical axis L direction. Thereby, the lens barrel moving mechanism 16 can be made thin in the direction of the optical axis L, and the size can be reduced.

  Further, the outer rails 23-1, 23-1, 24-1, 24-1 and the inner rails 23-2, 23-2, 24-2, and the first guide mechanisms 23, 23 and the second guide mechanisms 24, 24, The width direction of 24-2 is substantially coincident with the optical axis L. Thereby, the rigidity with respect to the rotational moment in the direction orthogonal to the optical axis L is increased, the heavy lens barrel 15 can be supported with strong rigidity, and the lens barrel 15 can be moved with high accuracy and smoothly. It becomes.

  Further, between the balls 23-3 of the first guide mechanism 23 and the rolling element rolling surfaces of the outer rail 23-1 and the inner rail 23-2, and between the balls 24-3 of the second guide mechanism 24 and the outer rail 24-1. And a preload (minus gap) is applied between the rolling element rolling surfaces of the inner rail 24-2. Thereby, since the rigidity of the first guide mechanism 23 and the second guide mechanism 24 is increased, the heavy lens barrel 15 can be moved more accurately and smoothly.

FIG. 8 is a front view of the fixed-side support member 21 of the lens barrel moving mechanism 16. In the figure, the fixed-side support member 21 is a plate-like member, and the upper and lower sides through which the lens barrel 15 penetrates the center portion. An oval through hole 25 having a large diameter is provided in the direction (Z-axis direction). The diameter of the through hole 25 in the vertical direction (Z-axis direction) is larger by 2d ₁ than the diameter D ₁ of the lens barrel 15, and the diameter in the left-right direction (X-axis direction) is 2d ₂ from the diameter D ₁ of the lens barrel 15. only is larger _{(d 1>} d 2), the lens barrel 15 through the through hole 25 with a margin.

FIG. 9 is a front view of the intermediate member 22 of the lens barrel moving mechanism 16. In the drawing, the intermediate member 22 is a plate-like member, and the left and right direction (X-axis direction) through which the lens barrel 15 penetrates in the center portion. ) Is provided with an oval through hole 26 having a large diameter. The through hole 26 has a diameter in the left-right direction (X-axis direction) that is 2d ₄ larger than the diameter D ₁ of the lens barrel 15, and a diameter in the vertical direction (Z-axis direction) is 2d ₃ from the diameter D ₁ of the lens barrel 15. only is larger _{(d 4>} d 3), the lens barrel 15 through the through hole 26 with a margin. Here, d ₂ ≈d ₄ .

FIG. 10 is a front view of the lens holding member 20 of the lens barrel moving mechanism 16. In FIG. 10, the lens holding member 20 is a plate-like member, and has a circular shape through which the lens barrel 15 penetrates substantially at the center. through holes 27 are provided, the diameter of the through hole 27 is substantially equal to the diameter D ₁ of the lens barrel 15, the lens barrel 15 extends through at close contact to the through hole 27.

By forming the diameters of the through holes 25, 26, and 27 of the fixed side support member 21, the intermediate member 22, and the lens holding member 20 as described above, the intermediate member 22 can be moved vertically with respect to the fixed side support member 21. The lens holding member 20 that can move in the range of d ₁ and is attached by penetrating the lens barrel 15 in close contact with the through hole 27 can move in the range of d _{4 in} the left-right direction with respect to the intermediate member 22. That is, it is possible to shift and adjust the projection position of the projected image by moving the lens barrel 15 provided with the projection lens 13 in the range of d _{1 in} the vertical direction and the range of d _{4 in} the horizontal direction.

  11A and 11B are diagrams showing a configuration example of a driving force applying mechanism that applies a driving force to the inner rail 23-2 of the first guide mechanism 23. FIG. 11A is a diagram viewed from below, and FIG. It is a front view (however, a motor and a worm are excluded). The driving force applying mechanism includes a motor 28, a worm 29 connected to the rotation shaft of the motor 28, a worm wheel 30 meshing with the worm 29, a screw shaft 31 connected to the worm wheel 30, and a nut screwed to the screw shaft 31. 33 and a connecting member 32 for connecting the nut 33 and the inner rail 23-2.

  In the driving force applying mechanism having the above configuration, when the motor 28 is rotated (forward or reverse), the worm wheel 30 and the screw shaft 31 are rotated through the worm 29, and the nut 33 is moved in the vertical direction (Z-axis direction). The inner rail 23-2 connected to the nut 33 via the connecting member 32 moves in the vertical direction (Z-axis direction). In addition, although illustration is abbreviate | omitted, the drive force provision mechanism which provides a drive force to the inner rail 24-2 of the 2nd guide mechanism 24 is also the substantially the same structure.

  In the above example, the first and second guide mechanisms 23 and 24 are provided, and the lens barrel 15 is moved in two directions, the left and right direction (X axis direction) and the up and down direction (Z axis direction). In some cases, it may be configured to move only in one axis (X-axis direction or Z-axis direction).

  In the above example, the first and second guide mechanisms 23, 24 are shown using balls 23-3, 24-3 as rolling elements, but the guide mechanisms are limited to those using balls as rolling elements. Of course, a roller (cylindrical body), for example, may be used as the rolling element.

  In the above example, the outer rails 23-1 and 24-1 of the first and second guide mechanisms 23 and 24 are the fixed side, and the inner rails 23-2 and 24-2 are the moving side. -2 and 24-2 may be the fixed side, and the outer rails 23-1 and 24-1 may be the moving side.

  FIG. 12 to FIG. 14 are diagrams showing the configuration of a lens barrel moving mechanism which is a main part of a liquid crystal projector as a second embodiment of the present invention. In the figure, reference numeral 56 denotes a lens barrel moving mechanism. The lens barrel moving mechanism 56 can be attached to the liquid crystal projector shown in FIG. 2 in place of the lens barrel moving mechanism 16 described above. The lens barrel moving mechanism 56 is configured in the same manner as the lens barrel moving mechanism 16 except for the portions described below, and the same components are denoted by the same reference numerals and shown in detail. Description is omitted.

  12 is a front view of the lens barrel moving mechanism 56, FIG. 13 is a cross-sectional view taken along arrow A2-A2 in FIG. 12, and FIG. 14 is a cross-sectional view taken along arrow B2-B2 in FIG. As illustrated, the lens barrel moving mechanism 56 includes a lens holding member guide mechanism that moves the lens holding member 20 in the vertical direction (Z-axis direction) and the horizontal direction (X-axis direction). The lens holding member guide mechanism is provided between the first guide mechanisms 63 and 63, which will be described in detail after being provided between the fixed support member 21 and the intermediate member 22, and between the intermediate member 22 and the lens holding member 20. And second guide mechanisms 64 and 64, which will be described in detail later.

  15 to 17 are views showing the configuration of the main part of the first guide mechanism 63. FIG. 15 is a partially cutaway perspective view, FIG. 16 is a partially cutaway side view, and FIG. 17 is a partially cutaway front view. FIG. As shown in the drawing, the first guide mechanism 63 is provided on the track rail 101 as a track member, a moving block 102 as a moving member incorporated so as to be movable relative to the track rail 101, and the moving block 102. A plurality of balls 103 serving as rolling elements that are accommodated in an endless circulation path and roll while receiving a load between the track rail 101 and the moving block 102 are provided. In this case, two moving blocks 102 are incorporated into one track rail 101. The moving block 102 is provided with a cage 104 that prevents the ball 103 from falling off the moving block 102 when the moving block 102 is removed from the track rail 101.

  The track rail 101 has a substantially rectangular cross-sectional shape with respect to the longitudinal direction, and rolling element rolling surfaces 101-1 are formed on both sides in the width direction along the longitudinal direction. Here, the rolling element rolling surface 101-1 is formed in a total of two lines, one on each side in the width direction. In addition, about the number and arrangement | positioning of the rolling-element rolling surface 101-1, it is variable suitably. Reference numeral 101-3 in the figure denotes a bolt insertion hole through which a bolt (not shown) for fastening the track rail 101 is inserted, at a predetermined interval along the longitudinal direction of the track rail 101. Is formed.

  On the other hand, the moving block 102 has a substantially U-shaped cross section perpendicular to the moving direction and is arranged so as to straddle the track rail 101. The block main body 121 and the movement of the block main body 121 A pair of end seals 123 for sealing the gap between the moving block 102 and the track rail 101 from the outside are mounted on the pair of end caps 122 fixed to the end surfaces in the direction by screws 130.

  As is clear from FIG. 17, the block main body 121 includes a horizontal portion 121-2 having a mounting surface 121-1, and a pair of sleeve portions 121-3 and 121-3 depending from both ends of the horizontal portion 121-2. A rolling element rolling surface 121-5 corresponding to the rolling element rolling surface 101-1 of the track rail 101 is provided on the inner side surface of each sleeve 121-3. Further, a rolling element return passage 121-6 is bored in the sleeve portion 121-3 in parallel with the rolling element rolling surface 121-5. The rolling element rolling surface 121-5 and the rolling element return passage 121-6 are also shown in FIG. The horizontal portion 121-2 is formed with a tap hole 121-7 into which a bolt (not shown) for fastening the block body 121 is screwed.

  As shown in FIG. 15, the direction change path 122-1 of the ball 103 is formed in the pair of end caps 122 provided. When the end cap 122 is attached to both end faces of the block main body 121 using bolts 129, the rolling element rolling surface 121-5 and the rolling element return passage 121-6 of the block main body 121 are connected to each other by the direction changing path 122-1. As a result, an infinite circuit is formed.

  As described above, the balls 103 are arranged and accommodated in the endless circulation path, and circulate with the relative movement of the track rail 101 and the moving block 102. And it rolls, receiving a load between the rolling-element rolling surface 101-1 of the track rail 101, and the rolling-element rolling surface 121-5 of the moving block 102. FIG.

  The second guide mechanism 64 has the same configuration as the first guide mechanism 63, and includes a track rail 201 and a moving block 202 having the same configuration as the track rail 101 and the moving block 102. A detailed diagram and description thereof will be omitted.

  As shown in FIG. 13, the track rails 101 of the first guide mechanisms 63 and 63 are fixed to both inner sides of the fixed side support member 21 in the left and right direction (X-axis direction), and the moving block 102 is fixed to both ends of the intermediate member 22 in the left and right direction Secure to. Further, as shown in FIG. 14, the track rails 201 of the second guide mechanisms 64, 64 are fixed inside the intermediate member 22 in the vertical direction (Z-axis direction), and the moving block 202 is placed outside the lens holding member 20 in the vertical direction. Fix it.

  In the case of the present embodiment, the driving force application by the driving force application mechanism and the like shown in FIG. 11 is performed not on the moving blocks 102 and 102 but on the lens holding member 20 and the intermediate member 22. That is, by applying a vertical driving force to the intermediate member 22, the lens holding member 20, that is, the lens barrel 15 is moved in the vertical direction, and a driving force is applied to the lens holding member 20 in the horizontal direction. Thus, the lens holding member 20, that is, the lens barrel 15 is moved in the left-right direction.

  As described above, the lens holding member guide mechanism includes the track rail 101 and the moving block 102, and includes the first guide mechanisms 63 and 63 that guide the lens holding member 20 in the vertical direction, the track rail 201 and the moving block 202. And second guide mechanisms 64 and 64 for guiding the lens holding member 20 in the left-right direction, and the ball 103 circulates in the endless circuit along with the relative movement of the track rails 101 and 201 and the moving blocks 102 and 202. With this configuration, the operation, that is, the relative movement of the track rails 101 and 201 and the moving blocks 102 and 202 becomes extremely smooth. Therefore, the lens barrel 15 can be moved more smoothly. Further, the lens holding member guide mechanism composed of the track rails 101 and 201 and the moving blocks 102 and 202 has a high rigidity, so that the lens barrel 15 can be firmly supported and moved with higher accuracy.

  Further, here, the track rails 101 and 201 and the moving blocks 102 and 202 included in the first guide mechanisms 63 and 63 and the second guide mechanisms 64 and 64 are arranged at substantially the same position in the optical axis L direction. As a result, the lens barrel moving mechanism 56 can be made thin in the direction of the optical axis L, and the size can be reduced.

  In addition, the width directions of the track rails 101 and 201 and the moving blocks 102 and 202 of the first guide mechanisms 63 and 63 and the second guide mechanisms 64 and 64 are substantially aligned with the optical axis L. Thereby, the rigidity with respect to the rotational moment in the direction orthogonal to the optical axis L is increased, the heavy lens barrel 15 can be supported with strong rigidity, and the lens barrel 15 can be moved with high accuracy and smoothly. It becomes.

  Further, between the balls 103 of the first guide mechanism 63 and the rolling rail rolling surfaces of the track rail 101 and the moving block 102 and between the balls 103 of the second guiding mechanism 64 and the rolling rail rolling surfaces of the track rail 201 and the moving block 202. Preload (minus gap) is applied during Thereby, since the rigidity of the first guide mechanism 63 and the second guide mechanism 64 is increased, the heavy lens barrel 15 can be moved smoothly with higher accuracy.

  In the above example, the track rails 101 and 201 of the first and second guide mechanisms 63 and 64 are set as the fixed side and the moving blocks 102 and 202 are set as the moving side. The rails 101 and 201 may be the moving side.

DESCRIPTION OF SYMBOLS 1 Light source 2 Dichroic mirror 3 Dichroic mirror 4 Reflecting mirror 5 Reflecting mirror 6 Liquid crystal panel 7 Liquid crystal panel 8 Liquid crystal panel 9 Dichroic mirror 10 Dichroic mirror 13 Projection lens 14 Projector housing 15 Lens barrel 16 Lens barrel moving mechanism 17 Glass plate 18 Glass plate rotation mechanism 20 Lens holding member 21 Fixed support member 22 Intermediate member 23 First guide mechanism 24 Second guide mechanism 25 Through hole 26 Through hole 27 Through hole 28 Motor 29 Warm 30 Warm wheel 31 Screw shaft 32 Connecting member 33 Nut 56 lens barrel moving mechanism 63 first guide mechanism 64 second guide mechanism 101 track rail 102 moving block 103 ball 121 block body 122 end cap 201 track rail 202 moving block

Claims (3)

A lens holding member that holds a lens barrel that internally includes a projection lens that projects light having image information, and a first and a second that are perpendicular to the optical axis of the light and perpendicular to each other. A lens holding member guiding means that is movably guided in the two axial directions, a fixed support member that supports the lens holding member guiding means, and a drive for moving the lens barrel in the first or second direction. A lens moving mechanism including a driving force applying means for applying a force,
The fixed-side support member includes a support frame including sides facing the lens holding member on both the left and right sides and the lower side in a direction orthogonal to the optical axis of the lens holding member,
The lens holding member guide means guides the lens barrel in a first direction perpendicular to the optical axis and a second direction perpendicular to the optical axis and perpendicular to the first direction. Comprising second guiding means;
The first guiding means is disposed between the inner walls of the left and right sides of the support frame and the lens holding member facing the inner walls of the left and right sides,
The second guide means includes a first guide means and a first guide which are opposed to each other between the lower side inner wall of the support frame and the lens holding member facing the lower side inner wall and at the upper part of the lens holding member. Between the means,
The first guide means and the second guide means are each provided with a race member provided with a rolling element rolling surface along the longitudinal direction, and a rolling element rolling surface corresponding to the rolling element rolling surface of the race member. A moving member that is incorporated so as to be relatively movable with respect to the track member, and a rolling element rolling surface of the track member and a plurality of rolling elements arranged between the rolling element rolling surface of the moving member. ,
The track member and the moving member respectively provided in the first guide unit and the second guide unit are disposed at substantially the same position in the optical axis direction of the light,
The width direction of the track member and the moving member of the lens holding member guide means is substantially coincident with the optical axis,
A preload is applied between the rolling elements of the lens holding member guide means, the raceway members, and the rolling element rolling surfaces of the moving members,
The track member is an outer rail made of a plate-like material and having a substantially U-shaped cross section perpendicular to the longitudinal direction, and the rolling element rolling surfaces are provided on both inner sides in the width direction, and the moving member is a plate An inner rail having a substantially U-shaped cross-sectional shape made of a material and provided with the rolling element rolling surfaces on both outer sides in the width direction, and the rolling element is a ball, A lens moving mechanism comprising a rolling element holder for rotatably holding each of the rolling elements. A lens holding member that holds a lens barrel that internally includes a projection lens that projects light having image information, and a first and a second that are perpendicular to the optical axis of the light and perpendicular to each other. A lens holding member guiding means that is movably guided in the two axial directions, a fixed support member that supports the lens holding member guiding means, and a drive for moving the lens barrel in the first or second direction. A lens moving mechanism including a driving force applying means for applying a force,
The fixed-side support member includes a support frame including sides facing the lens holding member on both the left and right sides and the lower side in a direction orthogonal to the optical axis of the lens holding member,
The lens holding member guide means guides the lens barrel in a first direction perpendicular to the optical axis and a second direction perpendicular to the optical axis and perpendicular to the first direction. Comprising second guiding means;
The first guiding means is disposed between the inner walls of the left and right sides of the support frame and the lens holding member facing the inner walls of the left and right sides,
The second guide means includes a first guide means and a first guide which are opposed to each other between the lower side inner wall of the support frame and the lens holding member facing the lower side inner wall and at the upper part of the lens holding member. Between the means,
The first guide means and the second guide means are each provided with a race member provided with a rolling element rolling surface along the longitudinal direction, and a rolling element rolling surface corresponding to the rolling element rolling surface of the race member. A moving member that is incorporated so as to be relatively movable with respect to the track member, and a rolling element rolling surface of the track member and a plurality of rolling elements arranged between the rolling element rolling surface of the moving member. ,
The track member and the moving member respectively provided in the first guide unit and the second guide unit are disposed at substantially the same position in the optical axis direction of the light,
The width direction of the track member and the moving member of the lens holding member guide means is substantially coincident with the optical axis,
A preload is applied between the rolling elements of the lens holding member guide means, the raceway members, and the rolling element rolling surfaces of the moving members,
The track member comprises a track rail provided with the moving body rolling surface on both sides in the width direction, and the moving member has an infinite circulation path including a rolling element rolling surface corresponding to the rolling body rolling surface of the track rail. A lens moving mechanism comprising a moving block provided, wherein the rolling elements are balls, arranged and accommodated in the endless circulation path, and circulated in accordance with relative movement of the track rail and the moving block. A lens moving mechanism according to claim 1 or 2, and a projector housing having a liquid crystal panel therein,
A liquid crystal projector configured to project light having image information from the liquid crystal panel onto a projection lens held by the lens moving mechanism.

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