JP2004279475A - Optical apparatus and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a housing and a projector which can be easily improved in terms of manufacturability. <P>SOLUTION: A housing side contact part 32 is arranged in a main housing 13. A lens barrel side contact part 43 coming into contact with the upper surface 36 of the housing side contact part 32 is arranged in a lens barrel 5. The lens barrel 5 is fixed to the main housing 13 by a fixing means 46 while the part 43 of the lens barrel 5 is supported in contact with the part 32 of the main housing 13. By supporting the weight of the lens barrel 5 from a lower side by the part 32, loads of fixing the lens barrel 5 to the main housing 13 by the fixing means 46 are reduced. By reducing the number of screws 44 used for attaching the lens barrel 5 to the main housing 13, the fixing means 46 is simplified, and then, the manufacturability of the housing 4 and the liquid crystal projector can be easily improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical device provided with a lens barrel in a housing body and a projector including the optical device.
[0002]
[Prior art]
Conventionally, a projector is provided with an optical system roughly divided into an illumination optical system and a projection optical system. The illumination optical system is provided in a main housing as a housing body, and the projection optical system is provided in a cylindrical tube as a lens barrel. The lenses are housed and held respectively in a lens barrel which is a body. The lens barrel is attached to a predetermined position of the main housing to project, that is, project illumination light from an illumination optical system onto a screen by a projection optical system.
[0003]
Here, it is necessary to securely mount the lens barrel so that the lens barrel does not shift with respect to the main housing in the optical axis direction and in the direction perpendicular to the optical axis direction.
[0004]
Therefore, a flange portion is provided around the one end side of the lens barrel substantially perpendicular to the optical axis, and the flange portion is brought into contact with a side surface portion of the main housing. 2. Description of the Related Art There is known a projector which is fixed to a main housing by inserting screws into four holes in the vertical and horizontal directions with respect to an optical axis and screwing the screws toward a side surface portion (for example, see Patent Document 1). 1).
[0005]
However, in this projector, since the lens barrel is supported only with screws in the vertical direction with respect to the main housing, it is not easy to reduce the number of places where the lens barrel is screwed to the main housing. It is not easy to improve the performance.
[0006]
When the lens barrel is attached to the main housing, it is necessary to appropriately set the optical positional relationship with the illumination optical system, that is, the back focus. For this reason, a thin-plate spacer is interposed between the flange portion of the lens barrel and the side surface portion of the main housing to adjust the positional relationship between the lens barrel and the main housing. Therefore, there is a problem that a step of selecting a spacer is required, and the use of the spacer increases the number of parts.
[0007]
[Patent Document 1]
JP-A-2000-39670 (page 4, FIG. 3 to FIG. 5)
[0008]
[Problems to be solved by the invention]
As described above, it is not easy to improve manufacturability in the above-described projector.
[0009]
SUMMARY An advantage of some aspects of the invention is to provide an optical device that can easily improve manufacturability and a projector including the optical device.
[0010]
[Means for Solving the Problems]
The optical device according to claim 1, wherein the housing body includes an optical system housing portion that houses the first optical system and a housing-side contact portion, and a lens barrel-side contact portion that contacts the housing-side contact portion. Wherein a second optical system separate from the first optical system is housed therein, and a cylindrical lens barrel having an optical axis in an axial direction, and the lens barrel side contact portion is provided on the housing side contact part. Fixing means for fixing the lens barrel to the housing body in a state in which the lens barrel is supported in contact with the upper side of the unit.
[0011]
Then, the lens barrel is fixed to the housing body by fixing means in a state in which the lens barrel-side contact part provided on the lens barrel is in contact with and supported above the housing-side contact part provided on the housing body. This allows the weight of the lens barrel to be supported from below by the housing-side contact portion and reduces the load of fixing the lens barrel to the housing body by the fixing means, thereby simplifying the fixing means. And the manufacturability is easily improved.
[0012]
In the optical device according to the second aspect, in the optical device according to the first aspect, the fixing means may include a screw having a shaft portion, and one of a housing-side contact portion and a lens barrel-side contact portion, the optical axis direction of which is set. A shaft portion provided through the crossing direction, the shaft portion of the screw being inserted, and the other of the housing-side contact portion and the lens barrel-side contact portion, wherein the shaft portion of the screw is provided. And a screw hole into which the screw is screwed. The hole has a dimension in the optical axis direction larger than an outer diameter of a shaft of the screw.
[0013]
Then, a hole in which the dimension in the optical axis direction of the barrel is larger than the outer diameter of the shaft of the screw is provided through one of the housing body and the barrel in a direction intersecting the optical axis direction, By inserting the shaft portion of the screw into the hole and screwing it into the screw hole provided in one of the housing body and the lens barrel, the lens barrel can be illuminated with respect to the housing body without using, for example, a spacer. Since the position can be easily adjusted in the axial direction, manufacturability is further improved.
[0014]
An optical device according to a third aspect is the optical device according to the first or second aspect, wherein a plurality of lens barrel-side contact portions are provided around the lens barrel, and selectively contact the housing-side contact portion. What is possible.
[0015]
By providing a plurality of lens barrel-side abutting parts around the lens barrel so as to be selectively abuttable with the housing-side abutting part, the best accuracy is obtained when the lens barrel is mounted on the housing body. The lens barrel is more accurately attached to the housing body by selecting such that the barrel-side abutting portion abuts on the housing-side abutting portion.
[0016]
According to a fourth aspect of the present invention, there is provided the optical device according to any one of the first to third aspects, further comprising a lens barrel guide provided on the housing body and positioned in a horizontal direction intersecting the optical axis direction of the lens barrel. It is provided.
[0017]
By providing the lens barrel guide means for positioning the lens barrel in a horizontal direction intersecting with the optical axis direction of the lens barrel, the lens barrel can be more accurately attached to the housing body.
[0018]
A projector according to claim 5, wherein the optical device according to any one of claims 1 to 4, a light source that irradiates the optical device with light, and an optical system housing portion of a housing body of the optical device, A first optical system that irradiates light emitted from a light source, a light modulation unit that modulates light that is emitted from the first optical system, and a light modulation unit that is housed in a lens barrel of the optical device. And a second optical system for projecting the modulated light.
[0019]
The provision of the optical device according to any one of claims 1 to 4 improves the productivity as a whole.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a configuration of a projector according to an embodiment of the present invention will be described with reference to FIGS.
[0021]
In FIG. 6, reference numeral 1 denotes a projector, that is, a liquid crystal projector as a projection display device. As shown in FIGS. 5 and 6, the liquid crystal projector 1 includes an illumination optical system 2 as a first optical system and a light modulation means. A housing 4 as an optical device including three transmissive LCD panels 3r, 3g and 3b as liquid crystal display elements, a lens barrel 5 as a lens barrel, and an illumination optical system 2 of the housing 4 A light source 6 for irradiating light is provided. The housing 4, the lens barrel 5, and the light source 6 are externally covered by a horizontally long exterior cover 7 as an exterior body. Inside the outer cover 7, a fan, a control circuit, an operation unit, a display unit, a power supply device, and the like, which are not shown, are provided.
[0022]
The illumination optical system 2 includes light emitted from the light source 6, that is, lens arrays LA 1 and LA 2 that reduce unevenness in illuminance of the illumination light, a heat ray cut filter CF arranged between the lens arrays LA 1 and LA 2, and a light source 6. A polarized beam splitter (PBS) S for aligning the direction of deflection of the irradiated light, a condenser lens CL as a superposition lens, dichroic reflection mirrors DM1 and DM2 as a color separation optical system, and a total reflection mirror as an optical element. It has certain reflection mirrors M1 to M3, relay lenses RL1 to RL3, red transmission filter F1, blue transmission filter F2, and field lenses FL1 and FL2.
[0023]
As shown in FIG. 1, the housing 4 includes a main housing 13 as a housing main body having an opening 12. A lid (not shown) that closes a part of the opening 12 is provided at an upper portion of the main housing 13, and a lid that is attached to the opening 12 together with the lid and closes the opening 12 of the main housing 13. The non-covered sub-lids are detachably attached with screws or the like.
[0024]
The main housing 13 is, for example, injection molded of a synthetic resin. The main housing 13 has a bottom surface portion 14 shown in FIG. 5 and a side surface portion 15 projecting upward from the periphery of the bottom surface portion 14 in a plate shape and having an upper end portion serving as an edge of the opening 12. Further, an optical system housing 16 that houses the illumination optical system 2 and communicates with the opening 12 is provided inside the main housing 13. Further, inside the side surface portion 15 of the main housing 13, as shown in FIG. 5, a groove portion 17 which faces the optical system housing portion 16 and is a holding portion for holding the illumination optical system 2 at a predetermined position is vertically arranged. Many are provided along the direction. As shown in FIG. 1, the optical system housing section 16 includes a light guide section 21 having a rectangular shape in plan view, a splitting section 22 having a U-shape in plan view, and a combining section 23 having a rectangular shape in plan view.
[0025]
The light guide 21 is provided at a position facing the light source 6. As shown in FIGS. 1 and 5, the first lens array LA <b> 1, the heat ray cut filter CF, and the second lens array LA are provided in the light guide 21 along the traveling direction of the light emitted from the light source 6. The lens array LA2 and the deflecting beam splitter S are sequentially arranged on the optical axis while being separated from each other. Further, a condenser lens CL is provided at a position between the light guide unit 21 and the light splitting unit 22.
[0026]
On the other hand, the light splitting unit 22 is disposed adjacent to the light guide unit 21 and around the combining unit 23 in a substantially U shape in plan view. In the light splitting unit 22, dichroic reflection mirrors DM1 and DM2, reflection mirrors M1 to M3, relay lenses RL1 and RL2, and a red transmission filter F1 and a blue transmission filter F2 are provided. Further, a relay lens RL3 and field lenses FL1 and FL2 are provided at positions between the light splitting unit 22 and the synthesizing unit 23, respectively.
[0027]
Further, as shown in FIGS. 1 and 5, the synthesizing unit 23 has three peripheral side surfaces surrounded by the light splitting unit 22, and the LCD panels 3r, 3g, 3b Are disposed in a U-shape in plan view, facing the relay lens RL3 and the field lenses FL1 and FL2, respectively. As shown in FIGS. 2 and 4, a rectangular parallelepiped dichroic cross prism DXP as a color light combining unit having three side faces facing the LCD panels 3r, 3g, 3b is disposed in the combining unit 23. ing.
[0028]
The dichroic cross prism DXP combines the three color lights modulated according to the predetermined video signals via the LCD panels 3r, 3g, 3b into one light flux again.
[0029]
Further, a circular fitting concave portion 25 is provided in a recessed portion of the side surface portion 15 of the main housing 13 which is not opposed to the light splitting portion 22 of the combining portion 23. The fitting recess 25 has an inner diameter substantially equal to the outer diameter of the lens barrel 5 and is recessed in a direction substantially perpendicular to the surface direction of the side surface portion 15.
[0030]
Further, the fitting concave portion 25 is provided with a rectangular light guide hole 26 penetrating the side surface portion 15. The light guide hole 26 has a vertical center located below the center of the fitting recess 25, and a lower end is provided near the edge of the fitting recess 25, and an upper end of the fitting recess 25 is provided. It is located above the center. The light guide hole 26 faces one end of the lens barrel 5 in the axial direction, and has an opening direction along the axial direction of the lens barrel 5, that is, along the optical axis X direction. Further, the light guide hole 26 is formed symmetrically with respect to a vertical imaginary straight line passing through the center of the fitting recess 25. Then, the light guide hole 26 allows the combining unit 23 to communicate with the outside of the housing 4, and the luminous flux color-combined by the dichroic cross prism DXP enters the lens barrel 5.
[0031]
Further, a support protrusion 31 protruding along the opening direction of the light guide hole 26 is provided integrally with the main housing 13 around the light guide hole 26 which is the lower half of the fitting recess 25. The support protrusion 31 is provided concentrically with the fitting recess 25, and is formed in a substantially semicircular shape substantially along the fitting recess 25.
[0032]
The support projection 31 includes a pair of housing-side abutting portions 32, a pair of escape portions 33, and a pair of barrel guide means provided between the housing-side abutment portion 32 and the escape portion 33. The lens barrel guide portion 34 and the reinforcing portion 35 provided between the pair of escape portions 33 are provided.
[0033]
The pair of housing-side abutting portions 32 are each formed in a flat plate shape protruding outward from the support protrusion 31 in the horizontal direction from the upper end of the support protrusion 31, that is, in the left-right direction shown in FIGS. 2 and 4. Is provided. That is, these housing-side abutting portions 32 protrude outward from the support projecting portions 31 in a flange shape. In addition, these housing-side abutting portions 32 are positioned substantially on an imaginary left-right imaginary straight line whose upper side surface 36 passes through the center of the fitting recess 25. These upper side surfaces 36 are provided with screw holes 37, respectively.
[0034]
The pair of escape portions 33 is provided in a trapezoidal shape that protrudes downward from the support protrusion 31 and expands upward. These escape portions 33 are provided apart from each other so as to form an angle of, for example, about 60 ° with respect to the center of the support protrusion 31. The relief portions 33 are provided at positions symmetrical with respect to an imaginary straight line passing through the center of the support protrusion 31 and extending in the vertical direction. Therefore, the housing-side contact portion 32 and the escape portion 33 are provided along the circumferential direction of the support protrusion 31 so as to sequentially form an angle of about 60 ° with the center of the support protrusion 31. In other words, the housing-side contact portion 32 and the escape portion 33 are provided at substantially equal intervals.
[0035]
The pair of lens barrel guides 34 are each formed in an arc shape along the outer peripheral surface of the lens barrel 5, and abut the outer peripheral surface of the lens barrel 5 from both sides to horizontally move the lens barrel 5. Positioning is performed in the direction, that is, the left and right direction shown in FIGS.
[0036]
Further, the reinforcing portion 35 is for reinforcing the pair of clearance portions 33 and the pair of lens barrel guide portions 34 to secure strength, and is formed in an arc shape along the outer peripheral surface of the lens barrel 5. I have.
[0037]
On the other hand, the lid is injection-molded with a synthetic resin in a substantially U-shape in plan view, and closes the opening 12 located above the beam splitting portion 22 of the main housing 13.
[0038]
Further, the sub lid is formed in a substantially rectangular shape in plan view, and closes the opening 12 above the light guide 21 of the main housing 13. Therefore, the sub lid closes the entire opening 12 of the main housing 13 together with the lid. Then, the sub lid is screwed and locked to the main housing 13 with a plurality of screws (not shown).
[0039]
The lens barrel 5 projects, that is, projects light, which is emitted from the light source 6 and passes through the inside of the housing 4, onto a screen (not shown) or the like, and as shown in FIG. It is formed in a substantially cylindrical shape having X. Further, the lens barrel 5 houses therein a projection optical system 41 as a second optical system separate from the illumination optical system 2 constituted by a plurality of lenses L held at predetermined positions. Further, at one end of the lens barrel 5 in the axial direction, as shown in FIGS. 1 and 2, a supported portion 42 supported by the support protrusion 31 is provided. One end in the axial direction of the supported portion 42 projects over a dimension substantially equal to the size of the recess of the fitting recess 25 so that the diameter of the distal end side is smaller than that of the base end side.
[0040]
Further, the supported portion 42 is provided with a plurality of pairs, for example, three pairs of lens barrel side contact portions 43 forming a rib-shaped pair. These lens barrel side contact portions 43 project in the radial direction of the lens barrel 5 and are provided in a plate shape along the axial direction of the lens barrel 5. The pair of lens barrel-side contact portions 43 are provided at positions that are point-symmetric with respect to the center of the lens barrel 5 in a cross-sectional view. Further, the lens barrel side contact portions 43 are spaced apart from each other at substantially equal intervals in the circumferential direction of the lens barrel 5. That is, the respective lens barrel-side contact portions 43 are provided at positions each forming an angle of about 60 ° with respect to the center of the lens barrel 5 in a sectional view.
[0041]
Each of the lens barrel side contact portions 43 is provided with a screw screwed into the screw hole 37, that is, a hole 45 into which the shaft portion 44 a of the screw 44 is inserted. These holes 45 are provided through the respective barrel-side abutting portions 43 in the thickness direction of the respective barrel-side abutting portions 43 in a direction intersecting with the optical axis X. Further, these holes 45 are formed such that the dimension in the optical axis X direction, that is, the axial direction of the lens barrel 5 is larger than the outer diameter of the shaft 44 a of the screw 44. The screw hole 37, the screw 44 and the hole 45 constitute a fixing means 46. In the present embodiment, the hole 45 is formed by cutting the lens barrel side contact portion 43 from the side.
[0042]
An annular flange 51 is provided on the outer peripheral surface of the lens barrel 5 on the center side of the supported part 42 in the axial direction of the lens barrel 5 so as to protrude in the radial direction of the lens barrel 5. The distance from one end of the lens barrel 5 in the axial direction of the lens barrel 5, that is, the end on the side of the supported portion 42 is substantially equal to the distance between the fitting recess 25 and the tip of the support protrusion 31. It is formed equal or slightly longer.
[0043]
Further, the lens barrel 5 includes a substantially cylindrical cam cylinder 52 and a substantially cylindrical lens guide cylinder 53 inserted into the cam cylinder 52 at the other end in the axial direction. The lens guide barrel 53 holds a part of the projection optical system 41 inside. The lens barrel 5 changes the position of the lens constituting the projection optical system 41 in the optical axis X direction by rotating the cam barrel 52 or the lens guide barrel 53 in the circumferential direction of the lens barrel 5. By doing so, an image zoom function or a focus adjustment (focus) function is provided.
[0044]
As shown in FIG. 1, the light source 6 includes a discharge lamp 61 such as an incandescent lamp such as a halogen lamp or a metal halide lamp. Around the discharge lamp 61, a reflector 62 having a parabolic mirror surface inside which reflects light emitted from the discharge lamp 61 is provided. As a result, the light emitted from the light source 6 from the discharge lamp 61 is reflected by the reflector 62 and enters the illumination optical system 2 of the light guide 21 of the housing 4.
[0045]
The exterior cover 7 is formed in a rectangular box shape using, for example, a synthetic resin in consideration of design and the like.
[0046]
Next, a method of assembling the housing 4 according to the embodiment will be described.
[0047]
First, various illumination optical systems 2, LCD panels 3r, 3g, 3b, and a dichroic cross prism DXP are arranged at predetermined positions in the main housing 13.
[0048]
Next, as shown in FIGS. 2 and 4, the supported portion 42 of the lens barrel 5 completed by inserting the lens guide barrel 53 holding the projection optical system 41 therein through the cam barrel 52 is attached to the main housing 13. Is mounted above the supporting projection 31.
[0049]
At this time, when the pair of lens barrel-side contact portions 43 of the lens barrel 5 is brought into contact with the upper side surface 36 of the housing-side contact portion 32 of the main housing 13 in a state of being aligned along the horizontal direction, the lens barrel The lens barrel-side abutting portions 43 located below 5 are accommodated in the escape portions 33 of the support projecting portions 31, respectively.
[0050]
Here, the lens barrel-side abutting portion 43 and the housing-side abutting portion 32 are connected to the illumination optical system in a state where the pair of lens barrel-side abutting portions 43 abut on the upper side surface 36 of the housing-side abutting portion 32. The optical axis of the system 2 and the optical axis of the projection optical system 41 are formed so as to coincide with each other.
[0051]
Further, the pair of lens barrel-side abutting portions 43 of the lens barrel 5 that abuts on the upper side surface 36 of the housing-side abutting portion 32 of the main housing 13 is formed from among the three pairs of lens barrel-side abutting portions 43. A lens with a small deviation of the optical axis from the illumination optical system 2, that is, a lens with the highest accuracy is selectively determined by rotating the lens barrel 5 by about 60 ° in the circumferential direction.
[0052]
If the lower surface of the supported portion 42 of the lens barrel 5 is brought into contact with the reinforcing portion 35 in a state where the lens barrel side contact portion 43 and the housing side contact portion 32 are in contact with each other, the support protrusion The support of the lens barrel 5 by the part 31 is more reliable.
[0053]
In addition, both sides of the lower outer peripheral surface of the supported portion 42 of the lens barrel 5 abut on the lens barrel guide 34 of the support projection 31 to position the lens barrel 5 in the horizontal direction.
[0054]
Further, one end of the supported portion 42 of the lens barrel 5 in the axial direction is fitted in the fitting recess 25 with a slight gap. That is, the position of the supported portion 42 is adjusted so that the optical axis of the illumination optical system 2 and the optical axis of the projection optical system 41 do not deteriorate by the contact between the lens barrel side contact portion 43 and the housing side contact portion 32. One end in the axial direction does not interfere with the peripheral edge of the fitting recess 25.
[0055]
Then, the shaft portion 44a of the screw 44 is inserted into the hole 45 of the pair of lens barrel-side abutting portions 43 of the lens barrel 5 abutting on the upper side surface 36 of the housing-side abutting portion 32 of the main housing 13, The lens barrel 5 is fixed to the main housing 13 by screwing the shaft portion 44 a of the screw 44 into the screw hole 37 of the housing-side contact portion 32 of the main housing 13.
[0056]
At this time, the lens barrel 5 is slid in the optical axis X direction within the distance between the shaft portion 44a of the screw 44 and the hole portion 45, and the mounting position of the lens barrel 5 with respect to the main housing 13 is changed to the optical axis X. In the direction, the optical positional relationship with the illumination optical system 2, that is, the back focus is appropriately set.
[0057]
Then, by tightening the screw 44, the housing-side abutting portion 32 and the lens-barrel-side abutting portion 43, which are in contact with each other, are tightened and fixed. Fixed.
[0058]
Thereafter, the cover 4 and the sub-cover are attached from above the main housing 13 so as to close the opening 12 and screwed to complete the housing 4.
[0059]
Next, the operation of the embodiment will be described.
[0060]
When the light source 6 is driven by the power supplied from the power supply unit, light is emitted from the light source 6 toward the light guide unit 21 of the housing 4.
[0061]
The light emitted from the light source 6 passes through the first lens array LA1, the heat ray cut filter CF, and the second lens array LA2 of the light guide unit 21, and after the deflection directions are aligned by the deflection beam splitter S, The light passes through the condenser lens CL and enters the light splitting unit 22 of the housing 4.
[0062]
Then, the R (red) component of the light transmitted through the condenser lens CL sequentially transmits through the dichroic reflection mirrors DM1 and DM2, then transmits through the relay lens RL1, is reflected by the reflection mirror M1, and transmits through the relay lens RL2. Is transmitted through the red transmission filter F1, is reflected by the reflection mirror M2, and enters the relay lens RL3.
[0063]
Further, the G (green) component of the light transmitted through the condenser lens CL is transmitted through the dichroic reflection mirror DM1, then is reflected by the dichroic reflection mirror DM2 and enters the field lens FL2.
[0064]
Further, the B (blue) component of the light transmitted through the condenser lens CL is reflected by the dichroic reflection mirror DM1, passes through the blue transmission filter F2, is reflected by the reflection mirror M3, and enters the field lens FL1.
[0065]
After that, these separated color lights enter the LCD panels 3r, 3g, 3b, respectively, and are independently modulated according to predetermined video signals, respectively, and are modulated by the dichroic cross prism DXP of the synthesizing unit 23 of the housing 4. The light is combined into a combined light, and is reflected to the lens barrel 5 through the light guide hole 26. Further, the projection optical system 41 such as the lens L of the lens barrel 5 irradiates a color image on the screen.
[0066]
Then, by rotating the cam barrel 52 of the lens barrel 5 or the lens guide barrel 53 in the circumferential direction of the lens barrel 5, the image on the screen is zoomed or the focus is adjusted, and the desired image is displayed on the screen. obtain.
[0067]
As described above, in the above-described embodiment, the lens barrel-side contact portion 43 provided on the lens barrel 5 is in contact with and supported by the upper side surface 36 of the housing-side contact portion 32 provided on the main housing 13. In this state, the lens barrel 5 is fixed to the main housing 13 by the fixing means 46.
[0068]
For this reason, by supporting the weight of the lens barrel 5 from below with the housing-side contact portion 32, most of the weight of the lens barrel 5 is increased by the housing-side contact portion of the support protrusion 31 of the main housing 13. 32, the load of fixing the lens barrel 5 to the main housing 13 by the fixing means 46 is reduced.
[0069]
As a result, the lens barrel 5 is securely attached to the main housing 13 so as to prevent rattling in the direction perpendicular to the optical axis X direction with respect to the main housing 13 so as to prevent displacement. The fixing means 46 can be simplified, such as by reducing the number of screws 44 used for attachment to the housing 13, and the manufacturability of the housing 4 and the liquid crystal projector 1 can be easily improved.
[0070]
In the above-described embodiment, the hole 45 in which the dimension of the lens barrel 5 in the optical axis X direction is larger than the outer diameter of the shaft portion 44a of the screw 44 is formed in the lens barrel side contact portion of the lens barrel 5. 43 is provided so as to penetrate in a direction intersecting the optical axis X direction, and the shaft portion 44 a of the screw 44 is inserted into the hole 45 and screwed into the screw hole 37.
[0071]
Therefore, the lens barrel 5 can be easily displaced in the optical axis X direction with respect to the main housing 13 without, for example, sandwiching a spacer or the like between the lens barrel 5 and the side surface portion 15 of the main housing 13. Therefore, a step of selecting a spacer having an appropriate thickness and the like are omitted, and an increase in the number of parts due to the use of the spacer can be prevented, so that manufacturability can be further improved.
[0072]
Furthermore, the lens barrel 5 is attached to the main housing 13 by providing a plurality of lens barrel side contact portions 43 around the lens barrel 5 so as to be selectively abuttable with the housing side contact portion 32. At this time, the lens barrel 5 can be attached to the main housing 13 with higher accuracy by selecting the lens barrel side contact portion 43 having the highest accuracy to be in contact with the housing side contact portion 32.
[0073]
In the conventional case where a flange provided at one axial end of the lens barrel 5 is screwed in the optical axis X direction with a screw 44 on the side surface 15 of the main housing 13, the screw 44 is inserted. Since it was necessary to provide a clearance or the like for allowing the screw 44 to be inserted into the hole of the flange portion, the mounting accuracy of the lens barrel 5 to the main housing 13 in the horizontal direction was not sufficient.
[0074]
However, in the above-described embodiment, the lens barrel guide portion 34 for positioning the lens barrel 5 in the horizontal direction is provided in the main housing 13 so that the lens barrel guide portion 34 is disposed in the horizontal direction intersecting the optical axis X of the lens barrel 5. By reliably positioning, the lens barrel 5 can be attached to the main housing 13 with higher accuracy.
[0075]
By providing a fitting concave portion 25 in the side surface portion 15 of the main housing 13 into which one end portion of the supported portion 42 of the lens barrel 5 in the axial direction fits, the light guide hole 26 is formed by the dichroic cross prism DXP. Can be prevented from leaking from the connecting portion between the main housing 13 and the lens barrel 5.
[0076]
In the above-described embodiment, a flange is provided at the end of the lens barrel 5 on the side of the main housing 13 so as to abut on the side surface 15 of the main housing 13, and the lens barrel-side abutting portion 43 is attached to the housing. Instead of fixing to the contact portion 32 with the screw 44, the flange portion may be fixed to the side surface portion 15 with a screw. In this case, the position adjustment of the lens barrel 5 in the optical axis X direction is performed by sandwiching a spacer between the side surface portion 15 and the flange portion as in the related art. Since the lens barrel side contact portion 43 is supported by the body side contact portion 32, the number of screws for fixing the lens barrel 5 is reduced.
[0077]
The housing 4 is not used only for the liquid crystal projector 1, but a film or a CCD (Charge Coupled Device) or the like is provided on the main housing 13 to form a body main body. By arranging a photographic lens system or the like as the second optical system, it is also possible to use it for a photographic device such as a camera.
[0078]
Further, as long as the lens barrel 5 can be attached to the main housing 13 with high accuracy using only a pair of barrel-side contact portions 43, it is not always necessary to selectively provide a plurality of barrel-side contact portions 43.
[0079]
Further, a configuration in which the screw hole 37 is provided in the lens barrel-side contact portion 43 and the hole 45 is provided in the housing-side contact portion 32 is also possible.
[0080]
The attachment of the lens barrel 5 to the main housing 13 is not limited to the one using the screw 44 or the like.
[0081]
Further, the illumination optical system 2 or the projection optical system 41 is not limited to the configuration of the above-described embodiment, and is appropriately designed so as to obtain desired optical characteristics.
[0082]
【The invention's effect】
According to the optical device of the first aspect, the fixing means is used in a state in which the lens barrel-side contact portion provided on the lens barrel is in contact with and supported above the housing-side contact portion provided on the housing body. By fixing the lens barrel to the housing body, the weight of the lens barrel is supported from below by the housing-side abutting portion, and the load of fixing the lens barrel to the housing body by the fixing means is reduced. The means can be simplified, and manufacturability can be easily improved.
[0083]
According to the optical device of the second aspect, in addition to the effect of the optical device of the first aspect, the housing has a hole in which the dimension of the lens barrel in the optical axis direction is larger than the outer diameter of the shaft of the screw. One of the main body and the lens barrel is provided so as to penetrate in a direction intersecting the optical axis direction, and the shaft part of the screw is inserted into the hole so that the screw is provided in the screw hole provided in the other of the housing body and the lens barrel. By combining, for example, the position of the lens barrel with respect to the housing body in the optical axis direction can be easily adjusted without using a spacer or the like.
[0084]
According to the optical device of the third aspect, in addition to the effect of the optical device of the first or second aspect, in addition to the effect of the optical device of the first or second aspect, the mirror can be configured such that the lens barrel side contact portion can selectively contact the housing side contact portion. By providing a plurality of parts around the cylinder, when attaching the lens barrel to the housing body, by selecting so that the lens barrel-side abutment part with the best accuracy abuts on the housing-side abutment part, The lens barrel can be attached to the body more accurately.
[0085]
According to the optical device according to the fourth aspect, in addition to the effect of the optical device according to any one of the first to third aspects, the barrel guide means for positioning the barrel in a horizontal direction crossing the optical axis direction of the barrel is provided. By providing the lens barrel on the body body, the lens barrel can be attached to the housing body with higher accuracy.
[0086]
According to the projector of the fifth aspect, by providing the optical device of any one of the first to fourth aspects, productivity can be improved as a whole.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a part of a projector according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a part of the projector.
FIG. 3 is a side view showing the optical device of the projector.
FIG. 4 is an exploded side view showing a part of the optical device;
FIG. 5 is a plan view showing the optical device.
FIG. 6 is an explanatory plan view showing the projector.
[Explanation of symbols]
1 LCD projector as a projector
2 Illumination optical system as first optical system
3r, 3g, 3b LCD panel as light modulation means
4 Housing as optical device
5 Lens barrel as barrel
6 light source
13 Main housing as housing main body
16 Optical system housing
32 Housing side contact part
34 lens barrel guide section as barrel guide means
37 screw hole
41 Projection Optical System as Second Optical System
43 Lens tube side contact part
44 screw
44a Shaft
45 hole
46 Fixing means
X optical axis

Claims (5)

A housing main body including an optical system housing portion for housing the first optical system and a housing side contact portion;
A cylindrical lens barrel having a lens barrel-side contact portion abutting on the housing-side contact portion, accommodating a second optical system separate from the first optical system, and having an optical axis in an axial direction; When,
An optical device, comprising: fixing means for fixing the lens barrel to the housing body in a state where the lens barrel-side contact portion is supported by being contacted above the housing-side contact portion. The fixing means
A screw having a shaft,
A hole through which a shaft portion of the screw is inserted, provided in one of the housing-side contact portion and the barrel-side contact portion so as to penetrate in a direction intersecting the optical axis direction;
A screw hole provided on one of the other of the housing-side contact portion and the lens barrel-side contact portion, and a screw shaft portion of the screw is screwed into the screw hole.
The optical device according to claim 1, wherein the hole has a dimension in the optical axis direction that is larger than an outer diameter dimension of a shaft of the screw. 3. The optical device according to claim 1, wherein a plurality of lens barrel-side contact portions are provided around the lens barrel, and are selectively contactable with the housing-side contact portion. 4. The optical device according to claim 1, further comprising a lens barrel guide provided on the housing main body and positioned in a horizontal direction intersecting the optical axis direction of the lens barrel. An optical device according to any one of claims 1 to 4,
A light source for irradiating the optical device with light,
A first optical system that is housed in an optical system housing part of a housing main body of the optical device and irradiates light emitted from the light source;
Light modulating means for modulating light emitted from the first optical system;
A second optical system housed in a lens barrel of the optical device and projecting light modulated by the modulation unit.

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