JP2011170238A - Projection lens device, projection lens device fixing mechanism, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection lens device and a projection lens device fixing mechanism configured to reduce an influence of warpage generated on the surface of a fixing part, and fix the projection lens device to an attachment part, thereby capable of suppressing positional deviation of a lens and maintaining image quality, to provide a projector including the projection lens device and the projection lens device fixing mechanism. <P>SOLUTION: The projection lens device 5 includes: the fixing part (flange 51) configured to hold the lens 81 and fix the body of the projection lens device 5 to the attachment part 31; and a correction part 61 configured to correct the warpage generated when the lens 81 is held by the flange 51. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection lens device, a projection lens device fixing mechanism, and a projector including these.

  2. Description of the Related Art Conventionally, there has been known a projector that modulates a light beam emitted from a light source based on an image signal to form image light, and enlarges and projects this image light by a projection lens device. The projection lens device provided in this projector constitutes an optical unit (optical device) of the projector and is installed as the final stage. The projection lens device includes a fixing unit for connecting to the preceding optical device, and is fixed to the mounting portion of the preceding optical device with a screw or the like.

  In recent years, projectors have been reduced in size and weight in order to reduce the environmental load. The same applies to the projection lens device, and a reduction in thickness (thinning) is achieved including a fixing portion that holds the lens. On the other hand, the optical zoom magnification of the projection lens device is also high. Therefore, the number of lenses constituting the projection lens device is increased as compared with the conventional one and the structure is complicated.

  Regarding the projection lens device, Patent Literature 1 and Patent Literature 2 are disclosed.

JP-A-5-333253 JP-T-2003-504649

  Under such circumstances, due to the thinning of the projection lens device and the like, there is a problem in that the surface of the fixed portion is warped when the lens is held in the fixed portion provided in the projection lens device. And when the fixed part which generate | occur | produced the curvature was mounted | worn (fixed) to the mounting part with a screw etc., curvature will be corrected and it will be fixed to a mounting part. When the warp is corrected and fixed, the lens to be held is displaced. In a projection lens apparatus with a high zoom magnification, the image quality (resolution) is greatly affected by the displacement of the lens, and from the wide end (the position where each lens is most retracted) to the tele end (the position where each lens is extended most). There is a problem that image quality cannot be maintained.

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

  Application Example 1 A projection lens apparatus according to this application example is a projection lens apparatus that magnifies and projects incident image light, and includes a fixing unit that holds the lens and fixes the projection lens apparatus body to the mounting unit. A correction unit that corrects a warp that occurs when the fixing unit holds the lens.

  According to such a projection lens device, by including the fixing unit and the correction unit that corrects the warp of the fixing unit, when the projection lens device is fixed to the mounting unit, the warp generated in the fixing unit is not corrected. It can be fixed to the mounting part. Thereby, it is possible to realize a projection lens device that suppresses the displacement of the lens.

  Application Example 2 In the projection lens device according to the application example, it is preferable that the correction unit is formed integrally with the fixed unit.

  According to such a projection lens device, the fixed portion including the correction portion can be manufactured, and the projection lens device can be efficiently assembled.

  Application Example 3 In the projection lens device according to the application example, it is preferable that the correction unit is formed separately from the fixed unit.

  According to such a projection lens device, when the fixing portion is fixed to the mounting portion, the correction portion can easily correspond to the warping of the fixing portion.

  Application Example 4 In the projection lens apparatus according to the application example described above, the correction unit is preferably formed of a sheet-like member.

  According to such a projection lens device, the correction unit is formed of a sheet-like member that is a separate body from the fixed unit, and therefore can easily cope with variations in the amount of warping of the fixed unit. it can.

  Application Example 5 The projection lens device fixing mechanism according to this application example is a projection lens device fixing mechanism that fixes a projection lens device that magnifies and projects incident image light, and fixes a fixing portion of the projection lens device. And a mounting unit for mounting the projection lens device, and a correction unit for correcting a warp generated when the fixing unit holds the lens.

  According to such a projection lens device fixing mechanism, it is possible to correct a warp generated in the fixing portion when the projection lens device is fixed to the mounting portion by including the mounting portion and a correction portion that corrects the warpage of the fixing portion. Without being fixed, it can be mounted on the mounting part. Thereby, it is possible to realize a projection lens device fixing mechanism that suppresses the displacement of the lens.

  Application Example 6 In the projection lens device fixing mechanism according to the application example described above, the correction unit is preferably formed integrally with the mounting unit.

  According to such a projection lens device fixing mechanism, the mounting portion including the correction portion can be manufactured, and the projection lens device fixing mechanism can be configured efficiently.

  Application Example 7 In the projection lens device fixing mechanism according to the application example, it is preferable that the correction unit is formed separately from the mounting unit.

  According to such a projection lens device fixing mechanism, when the fixing part is fixed to the mounting part, the correction part can easily correspond to the warp of the fixing part.

  Application Example 8 In the projection lens device fixing mechanism according to the application example, it is preferable that the correction unit is formed of a sheet-like member.

  According to such a projection lens device fixing mechanism, since the correction unit is formed of a sheet-like member that is separate from the mounting unit, it can be easily accommodated even if the amount of warpage of the fixing unit varies. be able to.

  Application Example 9 A projector according to this application example includes any one of the above-described projection lens devices and a light modulation device that modulates an incident light beam based on an image signal.

  According to such a projector, as described above, when the fixed portion has a warp, the projection lens device is provided with a projection lens device that is fixed to the mounting portion without correction and suppresses the positional deviation of the lens. A projector that maintains image quality at the tele end can be realized.

  Application Example 10 A projector according to this application example includes any one of the above-described projection lens device fixing mechanisms and a light modulation device that modulates an incident light beam based on an image signal.

  According to such a projector, as described above, when the fixing portion has a warp, the projection lens device fixing mechanism that suppresses the positional deviation of the lens by fixing to the mounting portion without correction is provided. A projector that maintains image quality from the end to the tele end can be realized.

1 is a schematic diagram showing a schematic configuration of a projector according to a first embodiment. The exploded perspective view of a projection lens device and a mounting part. FIG. 3 is a schematic cross-sectional view of a state in which the projection lens device is fixed to the mounting portion. The top view which shows the general shape of the correction | amendment part with which the flange of a projection lens apparatus is equipped. FIG. 9 is a schematic cross-sectional view of a state in which a projection lens device is fixed to a mounting portion of a projection lens device fixing mechanism according to a second embodiment. The top view which shows the general shape of the correction | amendment part with which a mounting part is equipped.

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

  FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector 1 according to the first embodiment. The configuration and operation of the projector 1 and the optical unit 2 will be briefly described with reference to FIG.

  The projector 1 according to this embodiment is a device that modulates a light beam emitted from a light source device 21 based on an image signal to form image light, and enlarges and projects this image light on a screen (not shown). The projector 1 includes an optical unit 2, an exterior casing 4 that constitutes the exterior of the projector 1 body, a control device, a power supply device, a cooling device, and the like that are not shown.

  The optical unit 2 of the projector 1 is a unit that optically processes a light beam emitted from the light source device 21 (light source 211) to form and project image light based on an image signal under the control of the control device. The optical unit 2 includes a light source device 21, an illumination optical device 22, a color separation optical device 23, a relay optical device 24, an electro-optical device 25, a projection lens device 5 as a projection optical device, and these optical devices 21 to 25. An optical component housing 3 is provided for accommodating the optical components and the like to be configured at predetermined positions.

  The light source device 21 includes a light source 211, a reflector 212, and the like. Then, the light source device 21 aligns the emission direction of the light beam emitted from the light source 211 with the reflector 212 and emits it toward the illumination optical device 22.

  The illumination optical device 22 includes a first lens array 221, a second lens array 222, a polarization conversion element 223, and a superimposing lens 224. The first lens array 221 and the second lens array 222 together with the superimposing lens 224 substantially superimpose the light beam emitted from the light source device 21 on the surface of a light modulation device (liquid crystal panel 253) described later. The polarization conversion element 223 has a function of aligning randomly polarized light emitted from the second lens array 222 with substantially one type of polarized light that can be used by the liquid crystal panel 253.

  The color separation optical device 23 includes two dichroic mirrors 231 and 232 and a reflection mirror 233, and a light beam emitted from the illumination optical device 22 is red light (hereinafter referred to as “R light”), green light (hereinafter referred to as “light”). G light ”) and blue light (hereinafter referred to as“ B light ”).

  The relay optical device 24 includes an incident side lens 241, a relay lens 243, and reflection mirrors 242, 244, and has a function of guiding the B light separated by the color separation optical device 23 to the B light liquid crystal panel 253B. The optical unit 2 has a configuration in which the relay optical device 24 guides the B light. However, the configuration is not limited thereto, and for example, the optical unit 2 may have a configuration that guides the R light.

  The electro-optical device 25 includes an incident-side polarizing plate 251, three liquid crystal panels 253 as a light modulation device (an R light liquid crystal panel 253 R, a G light liquid crystal panel 253 G, and a B light liquid crystal panel 253 B), and an emission side A polarizing plate 254 and a cross dichroic prism 255 as a color synthesis optical device are provided. The electro-optical device 25 modulates each color light separated by the color separation optical device 23 based on an image signal to form image light.

  The projection lens device 5 includes a plurality of lens groups each having one or more lenses as one lens group, and these lens groups are arranged along the optical axis C. The projection lens device 5 has a zoom adjustment function and a focus adjustment function for incident image light, and enlarges and projects the image light formed by the electro-optical device 25 onto a screen or the like.

  The optical component housing 3 accommodates optical components and the like constituting the optical devices 21 to 25 described above at predetermined positions. The optical component housing 3 includes a mounting portion 31 described later between the electro-optical device 25 and the projection lens device 5, and the projection lens device 5 is mounted on the mounting portion 31 with the optical axis C as the center. And fix.

  FIG. 2 is an exploded perspective view of the projection lens device 5 and the mounting portion 31. FIG. 3 is a schematic cross-sectional view of the projection lens device 5 fixed to the mounting portion 31. FIG. 4 is a plan view illustrating a schematic shape of the correction unit 61 provided in the flange 51 of the projection lens device 5. 3 shows a schematic cross-sectional view when the projection lens device 5 and the mounting portion 31 are assembled and cut along the line AA ′ shown in FIG. FIG. 4 is a plan view of the projection lens device 5 viewed from the image light incident side. The structure and assembly of the projection lens device 5 and the mounting portion 31 will be described with reference to FIGS.

  The projection lens device 5 includes a flange 51, a guide cylinder 52, a cam cylinder 53, and an emission side cylinder 54 as a fixed portion from the image light incident side to the emission side, and is held inside each of them. A plurality of lens groups are provided. The projection lens device 5 can perform zoom adjustment and focus adjustment of the image light by moving the lens group as each tube moves in the direction of the optical axis C.

  The flange 51 fixes the projection lens device 5 to the mounting portion 31 (optical component casing 3). The flange 51 is formed in a plate shape whose outer shape is substantially rectangular, and has a protruding portion 511 that protrudes toward the incident side of the image light at the center. The protruding portion 511 holds a lens 81 constituting a lens group. The flange 51 has insertion holes 512 through which the fixing screws 9 are inserted at four corners.

  The optical component housing 3 includes a mounting portion 31. The mounting portion 31 is installed substantially vertically (installed perpendicular to the optical axis C) from the bottom plate 32 of the optical component housing 3. The mounting portion 31 is formed in a plate shape having a substantially rectangular outer shape, and has an opening hole 311 for allowing image light from the preceding electro-optical device 25 to enter the projection lens device 5 at the center. ing. Further, the mounting portion 31 has screw holes 312 corresponding to the insertion holes 512 of the flange 51 at four corners. The electro-optical device 25 is fixed to the bottom plate 32. However, in FIG. 2, only the cross dichroic prism 255 constituting the electro-optical device 25 is illustrated.

  Here, returning to the description of the projection lens device 5, in order to hold the lens 81 on the projecting portion 511 of the flange 51, the flange 51 alone before assembling the projection lens device 5 is set on a jig, and an image is formed on the projecting portion 511. After mounting the lens 81 from the light incident side, the lens 81 is held by heat caulking. Due to this thermal caulking, as shown in FIG. 3, the flange 51 is slightly deformed in a state of warping on the image light incident side.

  On the surface 513 on the image light incident side of the flange 51 (a surface opposite to the mounting surface 313 of the mounting portion 31), as shown in FIGS. ing. The correction unit 61 is formed integrally with the flange 51. And the correction | amendment part 61 is formed in the circumference | surroundings spaced apart only the predetermined distance from the protrusion part 511 and the four insertion holes 512. FIG.

  The surface 611 of the correction unit 61 is formed to be a flat surface in a state in which the projection 81 511 of the flange 51 holds the lens 81 and is warped. Therefore, in the state at the time of forming the flange 51 (the state in which the lens 81 is not held by the protruding portion 511), the flange 51 is not warped, and conversely, the correction portion 61 (surface 611) is warped. Yes.

  As shown in FIG. 3, the surface 611 of the correction unit 61 is substantially parallel to the mounting surface 313 of the mounting unit 31. Therefore, when the projection lens device 5 is fixed to the mounting portion 31, as shown in FIG. 3, the protruding portion 511 of the flange 51 is inserted into the opening hole 311 of the mounting portion 31, and the four insertion holes of the flange 51 are combined. 512 is aligned with the corresponding screw hole 312 of the mounting portion 31. Thereby, the surface 611 of the correction unit 61 and the mounting surface 313 of the mounting unit 31 come into contact with each other. Then, the four fixing screws 9 are respectively inserted into the insertion holes 512 and screwed into the screw holes 312, thereby fixing the projection lens device 5 to the mounting portion 31.

According to the embodiment described above, the following effects can be obtained.
Since the projection lens device 5 of the present embodiment includes the correction unit 61 in the flange 51, when the projection lens device 5 is fixed to the mounting unit 31, the warp generated in the flange 51 that holds the lens 81 is not corrected. The mounting portion 31 can be fixed. Thereby, the projection lens device 5 that suppresses the positional deviation between the liquid crystal panel 253 and the lens 81 can be realized.

  In the projection lens device 5 of the present embodiment, the correction unit 61 is formed integrally with the flange 51. Therefore, the flange 51 including the correction unit 61 can be injection-molded, and the correction unit 61 is a separate body. The projection lens device 5 can be efficiently assembled as compared with the case where it is formed.

Since the projector 1 according to the present embodiment includes the projection lens device 5 that suppresses the displacement of the lens 81 by fixing to the mounting portion 31 without correcting when the flange 51 has a warp, the projector 1 from the wide end to the tele end. Image quality (resolution) can be maintained.
(Second Embodiment)

  FIG. 5 is a schematic cross-sectional view of the projection lens device 5 fixed to the mounting portion 31 of the projection lens device fixing mechanism 10 according to the second embodiment. FIG. 6 is a plan view illustrating a schematic shape of the correction unit 71 provided in the mounting unit 31. 5 shows a schematic cross-sectional view when the projection lens device 5 and the mounting portion 31 are assembled and cut along the line AA ′ shown in FIG. FIG. 5 is a plan view of the mounting portion 31 viewed from the image light emission side. The second embodiment will be described with reference to FIGS. 5 and 6.

  The projection lens device fixing mechanism 10 of the second embodiment includes a mounting unit 31 and a correction unit 71. And although the correction | amendment part 61 in the said 1st Embodiment is provided in the flange 51 side, it differs in the 2nd Embodiment that the correction | amendment part 71 is provided in the mounting part 31 side. Therefore, in the projection lens device 5 according to the second embodiment, the surface 513 of the flange 51 is warped and does not have the correction unit 61. The optical unit 2 of the projector 1 of the second embodiment is the same as that of the first embodiment except for the above.

  A correction portion 71 corresponding to the warped shape of the flange 51 is formed on the mounting surface 313 of the mounting portion 31, and a surface 711 of the correction portion 71 is formed by a surface that matches the warped shape of the flange 51. The correction unit 71 is formed integrally with the mounting unit 31. The correction unit 71 is formed around the opening hole 311 and the four screw holes 312 at a predetermined distance.

  Therefore, when the flange 51 (projection lens device 5) in a warped state is assembled to the mounting portion 31 as in the first embodiment, the surface 711 of the correction portion 71 formed on the mounting portion 31 and the surface 513 of the flange 51 are formed. And abut. Then, the projection lens device 5 can be fixedly attached to the attachment portion 31 by inserting the four fixing screws 9 into the insertion holes 512 and screwing them into the screw holes 312.

According to the second embodiment described above, the following effects can be obtained.
Since the projection lens device fixing mechanism 10 of the present embodiment includes the correction unit 71 in the mounting unit 31, when the projection lens device 5 is fixed to the mounting unit 31, the warp generated in the flange 51 that holds the lens 81 is corrected. It can fix to the mounting part 31 without doing. Thereby, the projection lens device fixing mechanism 10 that suppresses the positional deviation of the lens 81 from the liquid crystal panel 253 can be realized.

  In the projection lens device fixing mechanism 10 of the present embodiment, since the correction unit 71 is formed integrally with the mounting unit 31, the mounting unit 31 (optical component casing 3) including the correction unit 71 is injection-molded or the like. As compared with the case where the correction unit 71 is formed as a separate body, the projection lens device fixing mechanism 10 can be configured more efficiently.

  Since the projector 1 according to the present embodiment includes the projection lens device fixing mechanism 10 that suppresses the positional deviation of the lens 81 by fixing to the mounting portion 31 without correcting when the flange 51 has a warp, the projector 1 can be telescoped from the wide end. Image quality (resolution) at the edges can be maintained.

  Note that the present invention is not limited to the first and second embodiments described above, and various modifications and improvements can be made without departing from the scope of the invention. A modification will be described below.

  (Modification 1) The flange 51 of the first and second embodiments is deformed in a state of warping toward the incident side of the image light, and the correcting portions 61 and 71 are set corresponding to this warpage. However, the present invention is not limited to this, and the correction unit can be appropriately set according to the direction of warpage of the flange 51 (fixed portion) and the size of the warp.

  (Modification 2) In the projection lens device 5 of the first embodiment, the flange 51 is integrally formed with the correction unit 61. However, the invention is not limited to this, and the correction unit may be formed separately. . When the correction unit is configured separately from the flange, when the projection lens device is fixed to the mounting unit, the warp generated in the flange is corrected by interposing a separate correction unit between the flange and the mounting unit. Can be fixed without The same applies to the second embodiment, and the same effect is achieved.

  (Modification 3) In the projection lens device 5 of the first embodiment, the correction unit 61 is formed to correspond to the warp of the flange 51, and the surface 611 of the correction unit 61 and the mounting surface 313 of the mounting unit 31. Are substantially parallel surfaces. However, the present invention is not limited to this, and the correction unit may be formed using a sheet-like member. In this case, the sheet-like member can be used by appropriately determining the shape and thickness in accordance with the warp shape and the warp amount. Even when the amount of warpage includes variations, a sheet-like member can be easily accommodated. The same applies to the second embodiment, and the same effect is obtained.

  (Modification 4) In the optical unit 2 of the first and second embodiments, the light modulation device adopts a so-called three-plate method using three liquid crystal panels 253R, 253G, and 2530B. However, the present invention is not limited to this, and a single plate method may be adopted. Further, a liquid crystal panel for improving the contrast may be additionally employed.

  (Modification 5) In the optical unit 2 of the first and second embodiments, the light modulation device uses a transmissive liquid crystal panel 253. However, the present invention is not limited to this, and a reflective light modulation device such as a reflective liquid crystal panel can also be used.

  (Modification 6) In the optical unit 2 of the first and second embodiments, the light modulation device uses the liquid crystal panel 253. However, the present invention is not limited to this, and in general, any device that modulates an incident light beam based on an image signal may be used, and a micromirror light modulator or the like may be used. For example, a DMD (Digital Micromirror Device) can be used as the micromirror type light modulation device.

  (Modification 7) The optical unit 2 according to the first and second embodiments has a first lens array 221 and a second lens as an optical system for uniformizing the illuminance of a light beam emitted from the light source device 21 (light source 211). A lens integrator optical system including the array 222 is used. However, the present invention is not limited to this, and a rod integrator optical system including a light guide rod can also be used.

  (Modification 8) In the optical unit 2 of the first and second embodiments, the light source device 21 (light source 211) employs a discharge lamp, but a laser diode, LED (Light Emitting Diode), organic EL (Electro Luminescence) You may comprise with various solid light emitting elements, such as an element and a silicon light emitting element.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 3 ... Optical component housing, 5 ... Projection lens apparatus, 9 ... Fixing screw, 10 ... Projection lens apparatus fixing mechanism, 31 ... Mounting part, 51 ... Flange, 61, 71 ... Correction part, 81 ... Lens, 253 ... Liquid crystal panel.

Claims (10)

A projection lens apparatus that magnifies and projects incident image light,
A fixing unit for holding the lens and fixing the projection lens device main body to the mounting unit;
A correction unit that corrects a warp that occurs when the fixing unit holds the lens;
A projection lens apparatus comprising: The projection lens device according to claim 1,
The projection lens apparatus, wherein the correction unit is formed integrally with the fixed unit. The projection lens device according to claim 1,
The projection lens apparatus, wherein the correction unit is formed separately from the fixed unit. The projection lens device according to claim 3,
The projection lens apparatus, wherein the correction unit is formed of a sheet-like member. A projection lens device fixing mechanism for fixing a projection lens device that projects an enlarged image light,
A mounting portion for fixing the projection lens device and mounting the projection lens device;
A correction unit that corrects a warp that occurs when the fixing unit holds the lens;
A projection lens device fixing mechanism. The projection lens device fixing mechanism according to claim 5,
The projection lens device fixing mechanism, wherein the correction unit is formed integrally with the mounting unit. The projection lens device fixing mechanism according to claim 5,
The projection lens device fixing mechanism, wherein the correction unit is formed separately from the mounting unit. The projection lens device fixing mechanism according to claim 7,
The projection lens device fixing mechanism, wherein the correction unit is formed of a sheet-like member. A projection lens device according to any one of claims 1 to 4,
A light modulation device that modulates an incident light beam based on an image signal;
A projector comprising: A projection lens device fixing mechanism according to any one of claims 5 to 8,
A light modulation device that modulates an incident light beam based on an image signal;
A projector comprising:

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