JP4818301B2

JP4818301B2 - Lens moving mechanism and liquid crystal projector

Info

Publication number: JP4818301B2
Application number: JP2008081107A
Authority: JP
Inventors: 弘樹木場; 進竹原; 薫星出; 実小内; 健太郎衛藤
Original assignee: THK Co Ltd; Sanyo Electric Co Ltd
Current assignee: THK Co Ltd; Sanyo Electric Co Ltd
Priority date: 2008-03-26
Filing date: 2008-03-26
Publication date: 2011-11-16
Anticipated expiration: 2022-08-12
Also published as: JP2008225482A

Description

本発明は、液晶プロジェクタのレンズ鏡筒を保持・移動するレンズ移動機構及び該レンズ移動機構を備えた液晶プロジェクタに関するものである。 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.

図１は従来の液晶プロジェクタの構成例を示す図である。図中、１はメタルハライドランプ等よりなる光源、２、３は分離用のダイクロイックミラー、４、５は反射ミラー、６、７、８は液晶パネル、９、１０は光合成用のダイクロイックミラー、１１は一対の液晶プリズム１２Ａ、１２Ｂにより構成される光路調整機構、１３は投写レンズであり、これらのものは全てプロジェクタ筐体１４内に取り付けられている。 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.

前記光源１より発せられた光は、ダイクロイックミラー２、３により赤色（Ｒ）、青色（Ｂ）、緑色（Ｇ）の３原色の光に分光される。この分光された光は各光路上での液晶パネル６、７、８において各色成分の画像情報に応じて透過率が変調される。この変調された光はダイクロイックミラー９、１０により合成される。そして、この合成された光は光路調整機構１１により光路が調整された後、投写レンズ１３によりスクリーン（図示せず）上に拡大投写する。 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.

上記従来型の液晶プロジェクタにおいては、投写レンズ１３の前段に光路調整機構１１が設けられているため、液晶プロジェクタ内における各液晶パネル６、７、８と投写レンズ１３との距離（例えば液晶パネル６の場合、図１における距離ｍ）を上記光路調整機構１１の分だけ長くする必要があり、小型化に適していないという問題がある。 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.

更に液晶パネル６、７、８を透過した画像情報を有する光は、光路調整機構１１の液晶プリズム１２Ａ、１２Ｂを構成する多数のガラス板を通って投写レンズ１３により投写され、スクリーン上に拡大表示されるため、該多数のガラス板によりスクリーン上における投影画像の画像歪みや、色収差歪み等が大きくなり、高精細な画像を表示することができないという問題も生じる。 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.

また、上記小型化に適していないという問題や、投影画像の画像歪みや、色収差歪み等が大きくなり、高精細な画像を表示することができないという問題を解決するため、例えば特許文献１に示すように、レンズ鏡筒移動機構を設け、投写レンズを内部に備えるレンズ鏡筒をプロジェクタ筐体に対して直交する方向に移動するように構成し、小型化や画像歪み、色収差歪み等が大きく高精細な画像を表示することができない要因となる光路調整機構を除去した構成の液晶プロジェクタもある。液晶プロジェクタをこのように構成することにより、小型化が可能で、しかも投影画像に画像歪み及び色収差歪みが発生すること無しに、投影画像のシフト調整又はあおり調整を行うことができる。
特開平６−３３１９５３号公報 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 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

本発明は上記光路調整機構を除去した液晶プロジェクタのレンズ鏡筒移動機構を更に改良し、構成が簡単で、レンズ鏡筒の移動がスムーズで、且つ高精度の移動が可能なレンズ移動機構及び該レンズ移動機構を用いた液晶プロジェクタを提供することを目的とする。 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.

上記課題を解決するため請求項１に記載の発明は、画像情報を有する光を投射する投写レンズを内部に備えるレンズ鏡筒を保持するレンズ保持部材と、該レンズ保持部材を光の光軸に対して直交し、且つ互いに直交する第１及び第２の２軸方向に移動自在に案内するレンズ保持部材案内手段と、該レンズ保持部材案内手段を支える固定側支持部材と、レンズ鏡筒を第１或いは第２の方向に移動させるための駆動力を付与する駆動力付与手段とを備えたレンズ移動機構であって、レンズ保持部材と固定側支持部材とを中継する中間部材を具備し、レンズ保持部材案内手段は、固定側支持部材と中間部材との間に設けられた第１案内手段と、中間部材とレンズ保持部材との間に設けられた第２案内手段とを具備し、第１案内手段は中間部材の第１の軸方向への移動を案内し、第２案内手段はレンズ保持部材の第２の軸方向への移動を案内し、第１案内手段による中間部材の第１の軸方向への移動は、固定側支持部材に設けられた第１の貫通穴と該第１の貫通穴を貫通するレンズ鏡筒との間で規制され、第２案内手段によるレンズ保持部材の第２の軸方向への移動は、中間部材に設けられた第２の貫通穴と該第２の貫通穴を貫通するレンズ鏡筒との間で規制され、第１案内手段及び第２案内手段は、それぞれ長手方向に沿って転動体転走面が設けられた軌道部材と、該軌道部材の転動体転走面に対応する転動体転走面が設けられて軌道部材と相対運動自在に組み込まれた移動部材と、軌道部材の転動体転走面と移動部材の転動体転走面の間に配置された複数の転動体とを具備し、第１案内手段及び第２案内手段がそれぞれ具備する軌道部材及び移動部材は光の光軸方向において略同じ位置に配置されており、レンズ保持部材案内手段の軌道部材及び移動部材の幅方向は光軸と略一致しており、レンズ保持部材案内手段の転動体と軌道部材及び移動部材の転動体転走面の間に予圧を付与し、軌道部材は板状素材からなり長手方向に対して直角な断面形状が略コの字形状で幅方向両内側に転動体転走面が設けられたアウターレールであり、移動部材は板状素材からなり長手方向に対して直角な断面形状が略コの字形状で幅方向両外側に転動体転走面が設けられたインナーレールであり、転動体はボールであり、転動体の各々を回転自在に保持する転動体保持器を具備することを特徴とする。 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. A lens moving mechanism having a driving force applying means for applying a driving force for moving in the first or second direction, comprising an intermediate member that relays between the lens holding member and the fixed-side support member; holding member guide means comprises a first guide means provided between the fixed-side supporting member and the intermediate member, and a second guide means provided between the intermediate member and the lenses holding member, the first first guide means intermediate member To guide the movement in the axial direction, the second guide means to guide the movement in the second axis direction of the lens holding member, the movement in the first axial direction of the intermediate member according to the first guide means, the fixed side The movement of the lens holding member in the second axial direction by the second guide means is regulated between the first through hole provided in the support member and the lens barrel passing through the first through hole. The second guide hole and the lens barrel passing through the second through hole provided in the intermediate member are regulated, and the first guide means and the second guide means are respectively rolling elements along the longitudinal direction. A track member provided with a rolling surface, a moving member provided with a rolling element rolling surface corresponding to the rolling element rolling surface of the track member and incorporated in a relatively movable manner with respect to the track member, and a rolling member and a plurality of rolling elements disposed between the rolling member run face of member rolling surface and the moving member, the first guide The track member and the moving member respectively provided in the step and the second guide means are disposed at substantially the same position in the optical axis direction of the light, and the width direction of the track member and the moving member of the lens holding member guide means is substantially the same as the optical axis. A preload is applied between the rolling elements of the lens holding member guide means and the raceway member and the rolling member rolling surface of the moving member, and the raceway member is made of a plate material and has a cross-sectional shape perpendicular to the longitudinal direction. Is an outer rail provided with rolling element rolling surfaces on both inner sides in the width direction, and the moving member is made of a plate material and has a substantially U-shaped cross section perpendicular to the longitudinal direction. It is an inner rail provided with rolling element rolling surfaces on both outer sides in the width direction, the rolling element is a ball, and includes a rolling element holder that holds each of the rolling elements in a freely rotatable manner.

上記のようにレンズ保持部材案内手段を、長手方向に沿って転動体転走面が設けられた軌道部材と、該軌道部材の転動体転走面に対応する転動体転走面が設けられて軌道部材と相対運動自在に組み込まれた移動部材と、軌道部材の転動体転走面と移動部材の転動体転走面の間に配置された複数の転動体とで構成するので、軌道部材と移動部材の相対的移動は転動体を介してスムーズとなるから、投写レンズの移動もスムーズなものとなる。また、上記のように第１案内手段及び第２案内手段が夫々具備する軌道部材及び移動部材は光の光軸方向において略同じ位置に配置されているので、レンズ移動機構を光軸方向に薄型に構成でき、小型化が可能となる。また、第１案内手段による中間部材の第１の軸方向への移動は、固定側支持部材に設けられた第１の貫通穴と該第１の貫通穴を貫通するレンズ鏡筒との間で規制され、第２案内手段によるレンズ保持部材の第２の軸方向への移動は、中間部材に設けられた第２の貫通穴と該第２の貫通穴を貫通するレンズ鏡筒との間で規制されるので、簡単な構成でレンズの鏡筒の移動を正確に規制できるのである。また、レンズ保持部材案内手段の軌道部材及び移動部材の幅方向は光軸と略一致しているので、光軸方向に直交する方向の回転モーメントに対する剛性が大きくなり、重いレンズ鏡筒を強い剛性で支持することができ、レンズ鏡筒を高精度で且つスムーズに移動させることが可能となる。また、レンズ保持部材案内手段の転動体と軌道部材及び移動部材の転動体転走面の間に予圧（マイナス隙間）を付与することにより、レンズ保持部材案内手段の剛性が高くなるから、重いレンズ鏡筒を更に高精度で且つスムーズに移動させることが可能となる。また、軌道部材及び移動部材が板状素材からなるアウターレール、インナーレールであることから、例えば鋼鈑をプレス加工等を施すことによりこれらを容易に形成し得、又、転動体も安価な市販のボール等を使用し得ることから、比較的低廉に製造することができ、コストの低減が図れる。 As described above, the lens holding member guide means is provided with the raceway member provided with the rolling element rolling surface along the longitudinal direction, and the rolling element rolling surface corresponding to the rolling element rolling surface of the raceway member. a moving member which is incorporated in movable track member relative motion, since composed of a plurality of rolling elements arranged between the rolling member run surface of the rolling member rolling surface and the moving member of the track member, the track member Since the relative movement of the moving member is smooth via the rolling elements, the movement of the projection lens is also smooth. In addition, as described above, the track member and the moving member included in the first guide unit and the second guide unit are arranged at substantially the same position in the optical axis direction of the light, so that the lens moving mechanism is thin in the optical axis direction. And can be downsized. Further, the movement of the intermediate member in the first axial direction by the first guide means is performed between the first through hole provided in the fixed-side support member and the lens barrel passing through the first through hole. The movement of the lens holding member in the second axial direction by the second guide means is restricted between the second through hole provided in the intermediate member and the lens barrel passing through the second through hole. Since it is regulated, the movement of the lens barrel can be accurately regulated with a simple configuration. Further, since 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, the rigidity with respect to the rotational moment in the direction orthogonal to the optical axis direction is increased, and the heavy lens barrel is strongly rigid. The lens barrel can be moved with high accuracy and smoothly. In addition, by applying a preload (minus gap) between the rolling elements of the lens holding member guide means and the raceway members and the rolling element rolling surfaces of the moving members, the rigidity of the lens holding member guide means is increased. The lens barrel can be moved more accurately and smoothly. In addition, since the track member and the moving member are outer rails and inner rails made of a plate-shaped material, these can be easily formed by, for example, pressing a steel plate, and the rolling elements are also inexpensive on the market. Can be used at a relatively low cost, and the cost can be reduced.

請求項２に記載の発明は、画像情報を有する光を投射する投写レンズを内部に備えるレンズ鏡筒を保持するレンズ保持部材と、該レンズ保持部材を光の光軸に対して直交し、且つ互いに直交する第１及び第２の２軸方向に移動自在に案内するレンズ保持部材案内手段と、該レンズ保持部材案内手段を支える固定側支持部材と、レンズ鏡筒を第１或いは第２の方向に移動させるための駆動力を付与する駆動力付与手段とを備えたレンズ移動機構であって、レンズ保持部材と固定側支持部材とを中継する中間部材を具備し、レンズ保持部材案内手段は、固定側支持部材と中間部材との間に設けられた第１案内手段と、中間部材とレンズ保持部材との間に設けられた第２案内手段とを具備し、第１案内手段は中間部材の第１の軸方向への移動を案内し、第２案内手段はレンズ保持部材の第２の軸方向への移動を案内し、第１案内手段による中間部材の第１の軸方向への移動は、固定側支持部材に設けられた第１の貫通穴と該第１の貫通穴を貫通するレンズ鏡筒との間で規制され、第２案内手段によるレンズ保持部材の第２の軸方向への移動は、中間部材に設けられた第２の貫通穴と該第２の貫通穴を貫通するレンズ鏡筒との間で規制され、第１案内手段及び第２案内手段は、それぞれ長手方向に沿って転動体転走面が設けられた軌道部材と、該軌道部材の転動体転走面に対応する転動体転走面が設けられて軌道部材と相対運動自在に組み込まれた移動部材と、軌道部材の転動体転走面と移動部材の転動体転走面の間に配置された複数の転動体とを具備し、第１案内手段及び第２案内手段がそれぞれ具備する軌道部材及び移動部材は光の光軸方向において略同じ位置に配置されており、レンズ保持部材案内手段の軌道部材及び移動部材の幅方向は光軸と略一致しており、レンズ保持部材案内手段の転動体と軌道部材及び移動部材の転動体転走面の間に予圧を付与し、軌道部材は幅方向両側に転動体転走面が設けられた軌道レールからなり、移動部材は軌道レールの転動体転走面に対応する転動体転走面を含む無限循環路が設けられた移動ブロックからなり、転動体はボールであり無限循環路内に配列収容されて軌道レール及び移動ブロックの相対運動に伴って循環することを特徴とする。 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 unit that applies a driving force to move the lens holding member, and includes an intermediate member that relays the lens holding member and the fixed-side support member. A first guide means provided between the fixed-side support member and the intermediate member; and a second guide means provided between the intermediate member and the lens holding member . guiding the movement of the first axial , First the second guiding means to guide the movement in the second axis direction of the lens holding member, the movement in the first axial direction of the intermediate member according to the first guide means, provided on the stationary side support member The movement of the lens holding member in the second axial direction by the second guide means is restricted between the through hole of the lens and the lens barrel passing through the first through hole. The first guide means and the second guide means are each provided with a rolling element rolling surface along the longitudinal direction. The track is controlled between the through hole and the lens barrel passing through the second through hole. A rolling member rolling surface corresponding to the rolling member rolling surface of the race member, and a movable member that is incorporated so as to be relatively movable with respect to the race member; a rolling member rolling surface of the race member and a moving member; A plurality of rolling elements disposed between the rolling element rolling surfaces, wherein the first guiding means and the second guiding means Each of the track member and the moving member provided in the optical axis direction of light is disposed at substantially 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, Preload is applied between the rolling element of the lens holding member guide means and the raceway member and the rolling element rolling surface of the moving member, and the raceway member is made up of a track rail provided with rolling element rolling surfaces on both sides in the width direction. The member comprises a moving block provided with an infinite circulation path including a rolling element rolling surface corresponding to the rolling element rolling surface of the track rail, and the rolling elements are balls and are arranged and accommodated in the infinite circulation path. It circulates with the relative movement of the moving block.

上記のように、軌道部材は幅方向両側に転動体転走面が設けられた軌道レールからなり、移動部材は軌道レールの転動体転走面に対応する転動体転走面を含む無限循環路が設けられた移動ブロックからなり、該軌道レール及び移動ブロックの間に与圧を付与した状態で無限循環路内に配列収容されて転動体であるボールが該軌道レール及び移動ブロックの相対運動に伴って循環する構成では、その作動、つまり軌道レール及び移動ブロックの相対移動が極めて円滑で、且つ高い剛性を有する。よって、請求項１に記載の発明に比し、更にレンズ鏡筒をより強固に支え、スムーズに、より高精度に移動させることができる。

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 ball, which is a rolling element arranged and accommodated in an infinite circulation path with a pressure applied between the track rail and the moving block, is used for relative motion of the track rail and the moving block. In the configuration that circulates along with this, the operation, that is, the relative movement of the track rail and the moving block is extremely smooth and has high rigidity. Therefore, as compared with the first aspect of the invention , the lens barrel can be supported more firmly and moved smoothly and with higher accuracy.

請求項３に記載の発明は、請求項１又は２に記載のレンズ移動機構と、液晶パネルを内部に備えたプロジェクタ筐体を具備し、液晶パネルからの画像情報を有する光をレンズ移動機構が保持する投写レンズに投射するように構成したことを特徴とする液晶プロジェクタにある。 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. A liquid crystal projector is configured to project onto a holding projection lens .

上記のように液晶プロジェクタを請求項１又は２に記載のレンズ移動機構を具備する構成とするので、小型で、投影画像に画像歪み及び色収差歪みの発生することのない液晶プロジェクタとなる。 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 .

請求項１に記載の発明によれば、第１案内手段及び第２案内手段は、それぞれ長手方向に沿って転動体転走面が設けられた軌道部材と、該軌道部材の転動体転走面に対応する転動体転走面が設けられて軌道部材と相対運動自在に組み込まれた移動部材と、軌道部材の転動体転走面と移動部材の転動体転走面の間に配置された複数の転動体とを具備し、第１案内手段及び第２案内手段がそれぞれ具備する軌道部材及び移動部材は光の光軸方向において略同じ位置に配置されており、レンズ保持部材案内手段の軌道部材及び移動部材の幅方向は光軸と略一致しており、レンズ保持部材案内手段の転動体と軌道部材及び移動部材の転動体転走面の間に予圧を付与し、軌道部材は板状素材からなり長手方向に対して直角な断面形状が略コの字形状で幅方向両内側に転動体転走面が設けられたアウターレールであり、移動部材は板状素材からなり長手方向に対して直角な断面形状が略コの字状形状で幅方向両外側に転動体転走面が設けられたインナーレールであり、転動体はボールであり、転動体の各々を回転自在に保持する転動体保持器を具備するので、レンズ移動機構を光軸方向に薄型で、小型化、光軸方向に直交する方向の回転モーメントに対する剛性が大きくなり、重いレンズ鏡筒を強い剛性で支持することができ、レンズ鏡筒を高精度で、且つスムーズに移動させることができるレンズ移動機構を提供できる。また、軌道部材及び移動部材が板状素材からなるアウターレール、インナーレールであることから、例えば鋼鈑にプレス加工等を施すことにより容易に形成し得、又、転動体も安価な市販のボール等を使用し得るから、比較的低廉に製作することができ、コストの低減を図ることができる。 According to invention of Claim 1, a 1st guide means and a 2nd guide means are each a track member in which the rolling-element rolling surface was provided along the longitudinal direction, and the rolling-element rolling surface of this track member A rolling member having a rolling element rolling surface corresponding to the moving member, and a plurality of rolling members arranged between the rolling member rolling surface of the moving member and the rolling member rolling surface of the moving member. The track member and the moving member of the first guide means and the second guide means are disposed at substantially the same position in the optical axis direction of the light, and the track member of the lens holding member guide means. And the width direction of the moving member substantially coincides with the optical axis, and a preload is applied between the rolling element of the lens holding member guide means and the raceway member and the rolling element rolling surface of the moving member. The cross-sectional shape perpendicular to the longitudinal direction It is an outer rail provided with rolling element rolling surfaces on both inner sides, and the moving member is made of a plate-like material and has a substantially U-shaped cross section perpendicular to the longitudinal direction. It is an inner rail with a rolling surface, the rolling elements are balls, and it has a rolling element holder that holds each of the rolling elements in a freely rotatable manner, so that the lens moving mechanism is thin in the optical axis direction and compact. reduction, rigidity is increased relative to the direction of the rotation moment perpendicular to the optical axis direction, can be supported by a strong rigid heavy lens barrel, the lens barrel with high accuracy, the lens can be moved into 且 single smooth A moving mechanism can be provided. In addition, since the track member and the moving member are outer rails and inner rails made of a plate-like material, it can be easily formed by, for example, pressing a steel plate, and the rolling elements are also inexpensive commercial balls. Etc. can be used, so that it can be manufactured at a relatively low cost and the cost can be reduced.

請求項２に記載の発明によれば、軌道部材は幅方向両側に転動体転走面が設けられた軌道レールからなり、移動部材は該軌道レールの転動体転走面に対応する転動体転走面を含む無限循環路が設けられた移動ブロックからなり、無限循環路内に転動体であるボールが配列収容され該軌道レールと移動ブロックの間に与圧が付与された状態での軌道レール及び移動ブロックの相対移動は極めて円滑で高い剛性を有する。よって、請求項１に記載の発明に比してレンズ鏡筒をその重量による曲げモーメントに影響されることなく、より高精度でスムーズに移動させることができるレンズ移動機構を提供できる。 According to invention of Claim 2 , a track member consists of a track rail in which the rolling-element rolling surface was provided in the width direction both sides, and a moving member corresponds to the rolling-element rolling surface of this track rail. A track rail comprising a moving block provided with an infinite circulation path including a running surface, in which balls as rolling elements are arranged and accommodated in the endless circulation path and a pressure is applied between the track rail and the movement block. The relative movement of the moving block is extremely smooth and has high rigidity. Therefore, it is possible to provide a lens moving mechanism that can move the lens barrel more accurately and smoothly without being affected by the bending moment due to its weight as compared with the first aspect of the invention .

請求項３に記載の発明によれば、液晶プロジェクタを請求項１又は２に記載のレンズ移動機構を具備する構成とするので、小型で、投影画像に画像歪み及び色収差歪みの発生することのない液晶プロジェクタを提供できる。

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.

以下、本願発明の実施の形態例を図面に基づいて説明する。図２は本発明に係るレンズ移動機構を用いる第１実施例としての液晶プロジェクタの構成例を示す図である。図２において、図１と同一符号を付した部分は同一又は相当部分を示す。液晶プロジェクタは投写レンズ１３を収容するレンズ鏡筒１５の外部に、該レンズ鏡筒１５をプロジェクタ筐体１４に対して左右方向（Ｘ軸方向）、及び上下方向（Ｚ軸方向）に移動させるための後に詳述する構成のレンズ鏡筒移動機構１６が設けられている。また、レンズ鏡筒１５内には、投写レンズ１３よりも出光側に該レンズ鏡筒１５の出光口を塞ぐようにガラス板１７が取り付けられている。レンズ鏡筒１５の外部には、左右方向（Ｘ軸方向）に延びる第１回転軸、及び上下方向（Ｚ軸方向）に延びる第２回転軸を中心にガラス板１７を回転させるガラス板回転機構１８が設けられている。 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.

図３乃至図６は上記レンズ鏡筒移動機構１６の構成例を示す図で、図３は概略外観斜視図、図４は正面図、図５は図４のＡ１−Ａ１矢視断面図、図６は図４のＢ１−Ｂ１矢視断面図である。レンズ鏡筒移動機構１６は、レンズ鏡筒１５を保持するレンズ保持部材２０と、固定側支持部材２１と、該レンズ保持部材２０と固定側支持部材２１を中継する中間部材２２と、レンズ保持部材２０を上下方向（Ｚ軸方向）及び左右方向（Ｘ軸方向）に移動させるレンズ保持部材案内機構を具備している。該レンズ保持部材案内機構は、固定側支持部材２１と中間部材２２との間に設けられた後に詳述する第１案内機構２３、２３と、中間部材２２とレンズ保持部材２０との間に設けられた後に詳述する第２案内機構２４、２４とを具備する。 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.

図７は第１案内機構２３の構成を示す図で、図７（ａ）は一部切欠き斜視図、図７（ｂ）はＣ−Ｃ矢視断面図である。図７において、２３−１は軌道部材としてのアウターレール、２３−２は該アウターレール２３−１に収納される形で該アウターレール２３−１と相対運動自在に組み込まれたインナーレール、２３−３はアウターレール２３−１とインナーレール２３−２の間を転走する転動体としてのボール、２３−４はアウターレール２３−１とインナーレール２３−２との間で多数のボール２３−３を所定間隔で配列して保持するボール保持器としてのリテーナである。 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.

アウターレール２３−１は、板状素材からなり長手方向に対して直角な断面形状が略コの字形状で幅方向両内側に長手方向に沿って転動体転走面２３−１ａが設けられた構成である。インナーレール２３−２は、板状素材からなり長手方向に対して直角な断面形状が略コの字形状で幅方向両外側に長手方向に沿って転動体転走面２３−２ａが設けられた構成である。アウターレール２３−１の転動体転走面２３−１ａとインナーレール２３−２の転動体転走面２３−２ａは互いに対応し、両転動体転走面の間に多数のボール２３−３がリテーナ２３−４に回転自在に保持されている。 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.

なお、図示は省略するが第２案内機構２４も第１案内機構２３と同様の構成で、アウターレール２４−１、インナーレール２４−２、ボール２４−３及びリテーナ２４−４を具備している。 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. .

第１案内機構２３、２３のアウターレール２３−１、２３−１を図５に示すように、固定側支持部材２１の左右方向（Ｘ軸方向）両内側に固定し、インナーレール２３−２、２３−２を中間部材２２の左右方向両端に固定する。また、第２案内機構２４、２４のアウターレール２４−１、２４−１を図６に示すように、中間部材２２、２２の上下方向（Ｚ軸方向）内側に固定し、インナーレール２４−２、２４−２をレンズ保持部材２０の上下方向外側に固定する。 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.

第１案内機構２３、２３のインナーレール２３−２、２３−２をアウターレール２３−１、２３−１に対して、後に詳述する駆動力付与機構で上下方向に移動することにより、レンズ保持部材２０、即ちレンズ鏡筒１５は上下方向に移動する。第２案内機構２４、２４のインナーレール２４−２、２４−２をアウターレール２４−１、２４−１に対して、図示しない駆動力付与機構で左右方向に移動させることにより、レンズ保持部材２０、即ちレンズ鏡筒１５は左右方向に移動する。 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.

上記のようにレンズ保持部材案内機構を、アウターレール２３−１とインナーレール２３−２を具備し、レンズ保持部材２０を上下方向に案内する第１案内機構２３、２３と、アウターレール２４−１とインナーレール２４−２を具備し、レンズ保持部材２０を左右方向に案内する第２案内機構２４、２４を備えた構成とすることにより、第１案内機構２３、２３のアウターレール２３−１、２３−１に対するインナーレール２３−２、２３−２の移動はボール２３−３、２３−３を介してスムーズに行なわれ、第２案内機構２４、２４のアウターレール２４−１、２４−１に対するインナーレール２４−２、２４−２の移動はボール２４−３、２４−３を介してスムーズに行なわれるから、移動はスムーズとなり、レンズ鏡筒１５の移動もスムーズなものとなる。 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.

なお、アウターレール２３−１、２４−１、インナーレール２３−２、２４−２は、例えば鋼板にプレス加工等を施すことによてこれらを容易に形成し得、又，ボールも安価な市販のものを購入、使用し得ることから、比較的低廉に製作でき、コストの低減が図れる。 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.

また、ここでは第１案内機構２３、２３及び第２案内機構２４、２４が夫々具備するアウターレール２３−１、２３−１、２４−１、２４−１及びインナーレール２３−２、２３−２、２４−２、２４−２は光軸Ｌ方向において略同じ位置に配置されている。これにより、レンズ鏡筒移動機構１６を光軸Ｌ方向に薄く構成でき、小型化が可能となる。 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.

また、第１案内機構２３、２３及び第２案内機構２４、２４のアウターレール２３−１、２３−１、２４−１、２４−１及びインナーレール２３−２、２３−２、２４−２、２４−２の幅方向を光軸Ｌと略一致させている。これにより、光軸Ｌに直交する方向の回転モーメントに対する剛性が大きくなり、重いレンズ鏡筒１５を強い剛性で支持することができ、レンズ鏡筒１５を高精度で且つスムーズに移動させることが可能となる。 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.

また、第１案内機構２３のボール２３−３とアウターレール２３−１及びインナーレール２３−２の転動体転走面の間、及び第２案内機構２４のボール２４−３とアウターレール２４−１及びインナーレール２４−２の転動体転走面の間に予圧（マイナス隙間）を付与する。これにより、第１案内機構２３及び第２案内機構２４の剛性が大きくなるから、重いレンズ鏡筒１５を更に高精度で且つスムーズに移動させることが可能となる。 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.

図８はレンズ鏡筒移動機構１６の固定側支持部材２１の正面図であり、図において、固定側支持部材２１は、板状の部材であり、その中央部にレンズ鏡筒１５が貫通する上下方向（Ｚ軸方向）に径の大きい長円状の貫通穴２５が設けられている。該貫通穴２５は上下方向（Ｚ軸方向）の径がレンズ鏡筒１５の径Ｄ₁より２ｄ₁だけ大きく、左右方向（Ｘ軸方向）の径がレンズ鏡筒１５の径Ｄ₁より２ｄ₂だけ大きくなっており（ｄ₁＞ｄ₂）、レンズ鏡筒１５は余裕を持って該貫通穴２５を貫通する。 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 2d ₁ larger 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.

図９はレンズ鏡筒移動機構１６の中間部材２２の正面図であり、図示において、中間部材２２は板状の部材であり、その中央部にレンズ鏡筒１５が貫通する左右方向（Ｘ軸方向）に径が大きい長円状の貫通穴２６が設けられている。該貫通穴２６は左右方向（Ｘ軸方向）の径がレンズ鏡筒１５の径Ｄ₁より２ｄ₄だけ大きく、上下方向（Ｚ軸方向）の径がレンズ鏡筒１５の径Ｄ₁より２ｄ₃だけ大きくなっており（ｄ₄＞ｄ₃）、レンズ鏡筒１５は余裕を持って該貫通穴２６を貫通する。ここでｄ₂≒ｄ₄である。 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 .

図１０はレンズ鏡筒移動機構１６のレンズ保持部材２０の正面図であり、図において、レンズ保持部材２０は板状の部材であり、その略中央部にレンズ鏡筒１５が貫通する円状の貫通穴２７が設けられており、該貫通穴２７の径はレンズ鏡筒１５の径Ｄ₁に略等しくなっており、レンズ鏡筒１５は該貫通穴２７に密着状態で貫通している。 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. A through hole 27 is provided, and the diameter of the through hole 27 is substantially equal to the diameter D ₁ of the lens barrel 15, and the lens barrel 15 penetrates the through hole 27 in a close contact state.

固定側支持部材２１、中間部材２２及びレンズ保持部材２０の貫通孔２５、２６、２７の径をそれぞれ上記のように形成することにより、中間部材２２は固定側支持部材２１に対して上下方向にｄ₁の範囲で移動でき、レンズ鏡筒１５を貫通孔２７に密着状態で貫通して取り付けたレンズ保持部材２０は中間部材２２に対して左右方向にｄ₄の範囲で移動できる。即ち、投写レンズ１３を内部に備えるレンズ鏡筒１５を上下方向にｄ₁の範囲及び左右方向にｄ₄の範囲で移動させ、投写画像の投写位置をシフト調整できる。 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 penetrates and attaches the lens barrel 15 to the through hole 27 in close contact with the intermediate member 22 can move in the range of d _{4 in} the left-right direction. 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.

図１１は第１案内機構２３のインナーレール２３−２に駆動力を付与する駆動力付与機構の構成例を示す図で、図１１（ａ）は下方から見た図、図１１（ｂ）は正面図（但しモータ及びウォームを除く）である。駆動力付与機構は、モータ２８、該モータ２８の回転軸に連結したウォーム２９、該ウォーム２９に噛み合うウォームホイール３０、該ウォームホイール３０に連結したねじ軸３１、該ねじ軸３１に螺合するナット３３及び該ナット３３とインナーレール２３−２を連結する連結部材３２を具備する構成である。 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.

上記構成の駆動力付与機構において、モータ２８を回転（正転又は逆転）させるとウォーム２９を介してウォームホイール３０及びねじ軸３１が回転し、ナット３３が上下方向（Ｚ軸方向）に移動し、該ナット３３に連結部材３２を介して連結されたインナーレール２３−２が上下方向（Ｚ軸方向）に移動する。なお、図示は省略するが第２案内機構２４のインナーレール２４−２に駆動力を付与する駆動力付与機構も略同様な構成である。 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 driving force provision mechanism which provides a driving force to the inner rail 24-2 of the 2nd guide mechanism 24 is also the substantially same structure.

上記例では、第１及び第２案内機構２３、２４を設けて、レンズ鏡筒１５を左右方向（Ｘ軸方向）及び上下方向（Ｚ軸方向）の２軸に移動する構成としたが、いずれか１軸（Ｘ軸方向又はＺ軸方向）のみに移動する構成とする場合もある。 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).

また、上記例では、第１及び第２案内機構２３、２４に転動体としてボール２３−３、２４−３を用いるものを示したが、案内機構は転動体としてはボールを用いるものに限定されるものではなく、転動体として例えばローラ（円柱体）を用いたものでもよいことは当然である。 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.

また、上記例では、第１及び第２案内機構２３、２４のアウターレール２３−１、２４−１を固定側として、インナーレール２３−２、２４−２を移動側としたが、インナーレール２３−２、２４−２を固定側として、アウターレール２３−１、２４−１を移動側としてもよいことは当然である。 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.

図１２乃至図１４は、本発明の第２実施例としての液晶プロジェクタの要部であるレンズ鏡筒移動機構の構成を示す図である。図において、５６はレンズ鏡筒移動機構を示す。本レンズ鏡筒移動機構５６は、前述したレンズ鏡筒移動機構１６に代えて、図２に示した液晶プロジェクタに装着することができる。このレンズ鏡筒移動機構５６は、以下に説明する部分以外は上記レンズ鏡筒移動機構１６と同様に構成されており、同様の構成部分に関しては同一の参照符号を付して示し、その詳細な説明は省略する。 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.

図１２はレンズ鏡筒移動機構５６の正面図、図１３は図１２のＡ２−Ａ２矢視断面図、図１４は図１２のＢ２−Ｂ２矢視断面図である。図示するように、レンズ鏡筒移動機構５６はレンズ保持部材２０を上下方向（Ｚ軸方向）及び左右方向（Ｘ軸方向）に移動させるレンズ保持部材案内機構を備えている。該レンズ保持部材案内機構は、固定側支持部材２１と中間部材２２との間に設けられた後に詳述する第１案内機構６３、６３と、中間部材２２とレンズ保持部材２０との間に設けられた後に詳述する第２案内機構６４、６４とを具備する。 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.

図１５乃至図１７は上記第１案内機構６３の要部の構成を示す図で、図１５は一部切欠き斜視図、図１６は一部切欠き側面図、図１７は一部切欠き正面図である。図示するように、第１案内機構６３は、軌道部材としての軌道レール１０１と、該軌道レール１０１と相対運動自在に組み込まれた移動部材としての移動ブロック１０２と、該移動ブロック１０２に設けられた無限循環路内に配列収容され軌道レール１０１及び移動ブロック１０２の間で荷重を受けながら転動する複数の転動体としてのボール１０３とを備えている。移動ブロック１０２は、１本の軌道レール１０１に対してこの場合２つ組み込まれている。なお、移動ブロック１０２には、該移動ブロック１０２を軌道レール１０１から外した際に移動ブロック１０２からボール１０３が脱落するのを防止する保持器１０４が設けられている。 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.

上記軌道レール１０１は長手方向に対して直角な断面形状が略矩形状に形成され、その幅方向両側に長手方向に沿って転動体転走面１０１−１が形成されている。ここでは、転動体転走面１０１−１は幅方向両側に１条ずつ、合計２条が形成されている。なお、転動体転走面１０１−１の数、配置については適宜可変である。また、図中において符号１０１−３に示すのは、軌道レール１０１を締結するためのボルト（図示せず）を挿通するボルト挿通孔であり、軌道レール１０１の長手方向に沿って所定の間隔で形成されている。 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.

一方、上記移動ブロック１０２は、移動方向に対して直角な断面が略コの字状に形成され、軌道レール１０１を跨ぐように配設されており、ブロック本体１２１と、このブロック本体１２１の移動方向の端面に固定された一対のエンドキャップ１２２上には、移動ブロック１０２と軌道レール１０１との隙間を外部から密封する一対のエンドシール１２３がねじ１３０によって装着されている。 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.

図１７から明らかなように、ブロック本体１２１は、取付面１２１−１を備えた水平部１２１−２及びこの水平部１２１−２の両端部から垂下する一対の袖部１２１−３、１２１−３を有しており、各袖部１２１−３の内側面には軌道レール１０１の転動体転走面１０１−１に対応する転動体転走面１２１−５が設けられている。また、袖部１２１−３には、該転動体転走面１２１−５と平行に転動体戻し通路１２１−６が穿設されている。転動体転走面１２１−５及び転動体戻し通路１２１−６は、図１５にも示している。なお、上記水平部１２１−２には、ブロック本体１２１を締結するためのボルト（図示せず）が螺合するタップ孔１２１−７が形成されている。 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.

図１５に示すように、一対設けられたエンドキャップ１２２にはボール１０３の方向転換路１２２−１が形成されている。エンドキャップ１２２をボルト１２９を用いてブロック本体１２１の両端面に装着すると、ブロック本体１２１の転動体転走面１２１−５と転動体戻し通路１２１−６がこの方向転換路１２２−１によって連通連結され、これにより無限循環路が形成される。 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.

前述のように、ボール１０３はこの無限循環路内に配列収容され、軌道レール１０１及び移動ブロック１０２の相対運動に伴って循環する。そして、軌道レール１０１の転動体転走面１０１−１と移動ブロック１０２の転動体転走面１２１−５との間で荷重を受けながら転動する。 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.

なお、第２案内機構６４も第１案内機構６３と同様の構成であり、上記軌道レール１０１、移動ブロック１０２と同じ構成の軌道レール２０１、移動ブロック２０２を備えている。その詳細を示す図、及び説明は省略する。 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.

図１３に示すように、上記第一案内機構６３、６３の軌道レール１０１を固定側支持部材２１の左右方向（Ｘ軸方向）両内側に固定し、移動ブロック１０２を中間部材２２の左右方向両端に固定する。また、図１４に示すように、第２案内機構６４、６４の軌道レール２０１を中間部材２２の上下方向（Ｚ軸方向）内側に固定し、移動ブロック２０２をレンズ保持部材２０の上下方向外側に固定する。 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. To fix. 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.

本実施例の場合、図１１に示す駆動力付与機構他による駆動力付与は、移動ブロック１０２、１０２に対してではなく、レンズ保持部材２０、中間部材２２に対して行われる。即ち、中間部材２２に対して上下方向の駆動力を付与することで、レンズ保持部材２０、即ちレンズ鏡筒１５は上下方向に移動され、レンズ保持部材２０に対して左右方向に駆動力を付与することで、レンズ保持部材２０、即ちレンズ鏡筒１５は左右方向に移動される。 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.

上記のように、レンズ保持部材案内機構を、軌道レール１０１と移動ブロック１０２を具備し、レンズ保持部材２０を上下方向に案内する第１案内機構６３、６３と、軌道レール２０１と移動ブロック２０２を具備し、レンズ保持部材２０を左右方向に案内する第２案内機構６４、６４を備え、軌道レール１０１、２０１及び移動ブロック１０２、２０２の相対運動に伴ってボール１０３が無限循環路内を循環するように構成することにより、その作動、つまり軌道レール１０１、２０１及び移動ブロック１０２、２０２の相対移動が極めて円滑となる。よって、レンズ鏡筒１５をよりスムーズに移動させることができる。また、軌道レール１０１、２０１及び移動ブロック１０２、２０２からなるレンズ保持部材案内機構の剛性が大きく、レンズ鏡筒１５を強固に支え、より高精度に移動させることができる。 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.

また、ここでは、第１案内機構６３、６３及び第２案内機構６４、６４が夫々具備する軌道レール１０１、２０１及び移動ブロック１０２、２０２は光軸Ｌ方向において略同じ位置に配置されている。これにより、レンズ鏡筒移動機構５６を光軸Ｌ方向に薄く構成でき、小型化が可能となる。 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.

また、第１案内機構６３、６３及び第２案内機構６４、６４の軌道レール１０１、２０１及び移動ブロック１０２、２０２の幅方向を光軸Ｌと略一致させている。これにより、光軸Ｌに直交する方向の回転モーメントに対する剛性が大きくなり、重いレンズ鏡筒１５を強い剛性で支持することができ、レンズ鏡筒１５を高精度で且つスムーズに移動させることが可能となる。 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.

また、第１案内機構６３のボール１０３と軌道レール１０１及び移動ブロック１０２の転動体転走面の間、及び第２案内機構６４のボール１０３と軌道レール２０１及び移動ブロック２０２の転動体転走面の間に予圧（マイナス隙間）を付与する。これにより、第１案内機構６３及び第２案内機構６４の剛性が大きくなるから、重いレンズ鏡筒１５を更に高精度でスムーズに移動させることが可能となる。 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.

また、上記例では、第１及び第２案内機構６３、６４の軌道レール１０１、２０１を固定側として、移動ブロック１０２、２０２を移動側としているが、移動ブロック１０２、２０２を固定側として、軌道レール１０１、２０１を移動側としてもよい。 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.

従来の液晶プロジェクタの構成例を示す図である。It is a figure which shows the structural example of the conventional liquid crystal projector. 本発明に係るレンズ移動機構を用いる液晶プロジェクタの構成を示す図である。It is a figure which shows the structure of the liquid-crystal projector using the lens moving mechanism which concerns on this invention. 本発明に係るレンズ移動機構のレンズ鏡筒移動機構（第１実施例）の構成例を示す概略外観斜視図である。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. 本発明に係るレンズ移動機構のレンズ鏡筒移動機構（第１実施例）の構成例を示す正面図である。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. 図４のＡ１−Ａ１矢視断面図である。It is A1-A1 arrow sectional drawing of FIG. 図４のＢ１−Ｂ１矢視断面図である。It is B1-B1 arrow sectional drawing of FIG. 第１案内機構の構成を示す図で、図７（ａ）は一部切り欠き斜視図、図７（ｂ）はＣ−Ｃ矢視断面図である。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. レンズ鏡筒移動機構の固定側支持部材の正面図である。It is a front view of the fixed side support member of a lens barrel moving mechanism. レンズ鏡筒移動機構の中間部材の正面図である。It is a front view of the intermediate member of a lens barrel moving mechanism. レンズ鏡筒移動機構のレンズ保持部材の正面図である。It is a front view of the lens holding member of a lens barrel moving mechanism. 第１案内機構の駆動力付与機構の構成例を示す図で、図１１（ａ）は下方から見た図、図１１（ｂ）は正面図である。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. 本発明に係るレンズ移動機構のレンズ鏡筒移動機構（第２実施例）の構成例を示す正面図である。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. 図１２のＡ２−Ａ２矢視断面図である。It is A2-A2 arrow sectional drawing of FIG. 図１２のＢ２−Ｂ２矢視断面図である。It is B2-B2 arrow sectional drawing of FIG. 第１案内機構の要部の一部切欠き斜視図である。It is a partially cutaway perspective view of the principal part of a 1st guide mechanism. 図１５の第１案内機構の一部切欠き側面図である。It is a partially cutaway side view of the 1st guide mechanism of FIG. 図１５の第１案内機構の一部切欠き正面図である。FIG. 16 is a partially cutaway front view of the first guide mechanism of FIG. 15.

Explanation of symbols

１光源
２ダイクロイックミラー
３ダイクロイックミラー
４反射ミラー
５反射ミラー
６液晶パネル
７液晶パネル
８液晶パネル
９ダイクロイックミラー
１０ダイクロイックミラー
１３投写レンズ
１４プロジェクタ筐体
１５レンズ鏡筒
１６レンズ鏡筒移動機構
１７ガラス板
１８ガラス板回転機構
２０レンズ保持部材
２１固定側支持部材
２２中間部材
２３第１案内機構
２４第２案内機構
２５貫通穴
２６貫通穴
２７貫通穴
２８モータ
２９ウォーム
３０ウォームホイール
３１ねじ軸
３２連結部材
３３ナット
５６レンズ鏡筒移動機構
６３第１案内機構
６４第２案内機構
１０１軌道レール
１０２移動ブロック
１０３ボール
１２１ブロック本体
１２２エンドキャップ
２０１軌道レール
２０２移動ブロック DESCRIPTION OF SYMBOLS 1 Light source 2 Dichroic mirror 3 Dichroic mirror 4 Reflection mirror 5 Reflection 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

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,
An intermediate member that relays between the lens holding member and the fixed-side support member;
The lens holding member guide means includes first guide means provided between the fixed support member and the intermediate member, and second guide means provided between the intermediate member and the lens holding member. Comprising
Said first guide means to guide the movement of the said first axial direction of the intermediate member, said second guide means guides the movement to the second axial direction of the lens holding member,
The movement of the intermediate member in the first axial direction by the first guide means is performed between a first through hole provided in the fixed-side support member and the lens barrel passing through the first through hole. The movement of the lens holding member in the second axial direction by the second guide means is controlled by a second through hole provided in the intermediate member and a lens barrel passing through the second through hole. Regulated between
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 and having the rolling element rolling surfaces on both outer sides in the width direction, the rolling element is a ball, and the rolling element is a ball. A lens moving mechanism comprising a rolling element holder for rotatably holding each moving object.

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,
An intermediate member that relays between the lens holding member and the fixed-side support member;
The lens holding member guide means includes first guide means provided between the fixed support member and the intermediate member, and second guide means provided between the intermediate member and the lens holding member. Comprising
Said first guide means to guide the movement of the said first axial direction of the intermediate member, said second guide means guides the movement to the second axial direction of the lens holding member,
The movement of the intermediate member in the first axial direction by the first guide means is performed between a first through hole provided in the fixed-side support member and the lens barrel passing through the first through hole. The movement of the lens holding member in the second axial direction by the second guide means is controlled by a second through hole provided in the intermediate member and a lens barrel passing through the second through hole. Regulated between
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 made of the track rail rolling member run surface is provided on both sides in the width direction, the moving member is endless circulation path including a rolling member rolling surface corresponding to the rolling member run surface of the track rail A lens moving mechanism comprising a moving block provided, wherein the rolling elements are balls and are arranged and accommodated in the infinite circulation path and circulate 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.