JP7528615B2 - Optical element angle adjustment device and image projection device - Google Patents

Description

The present invention relates to an optical element angle adjustment device and an image projection device.

Today, projectors are known that project a desired image onto a screen or the like. The accuracy of the fixed position of the optical elements of the projector is often required to be higher than the dimensional accuracy of the component parts.

A known method for fixing optical elements is to hold the optical element with a jig or tool and glue it in place at a specified position. Alternatively, a method is known in which a shim is inserted for each optical element so that it is placed in a specified position. Furthermore, a method is known in which the position of the optical element is adjusted by tightening or loosening an adjustment screw, thereby adjusting the fixed position.

A "shim" is a component that has, for example, a wedge or plate shape and is inserted into the gap between components to adjust the position of each component. It is also sometimes called a spacer.

Patent document 1 (JP 2002-90876 A) discloses a projector that allows the mirror angle to be adjusted with high precision. This projector presses the mirror from both sides with an elastic member and an adjustment member, and adjusts the mirror angle by moving the adjustment member.

However, the method of adhesively fixing the optical element requires tools to position the optical element in a specified position and equipment to apply the appropriate amount of adhesive. For this reason, it is difficult to say that this method makes it possible to easily adjust the angle of the optical element.

In addition, when adjusting the angle of an optical element by inserting a shim, the shim must be replaced to obtain the desired optical performance, but this makes it difficult to check the optical performance during the replacement process, which creates the problem of making it difficult to adjust the angle of the optical element with high precision.

In addition, in the case of a method in which the angle is adjusted by displacing the optical element with an adjustment screw, the adjustment screw can move after position adjustment due to vibration or impact, resulting in poor adjustment. For this reason, it is necessary to glue the adjustment screw after the final adjustment, which is also a time-consuming method.

The present invention was made in consideration of the above-mentioned problems, and aims to provide an optical element angle adjustment device and an image projection device that can adjust the angle of an optical element easily and accurately.

In order to solve the above-mentioned problems and achieve the object, the present invention provides a mirror holding part that holds an optical mirror, a first protrusion and a second protrusion that are provided so as to protrude on the same axis from positions facing the mirror holding part across the optical mirror, a bearing part that supports the first protrusion, a first adjustment member that fits into the second protrusion and tilts the mirror holding part in a first direction with the center of the first protrusion as a fulcrum , and a second adjustment member that fits into the second protrusion protruding from the first adjustment member and rotates the mirror holding part via the second protrusion in a second direction about the axis as a rotation axis, wherein the first adjustment member adjusts the position of the second protrusion to adjust the tilt angle of the mirror holding part in the first direction , and the second adjustment member adjusts the rotation angle of the second adjustment member in the second direction to rotate the mirror holding part via the second protrusion, and after adjusting the rotational position of the mirror holding part, the positions of the first adjustment member and the second adjustment member are fixed with a fixing member.

The present invention has the advantage that the angle of the optical element can be adjusted easily and accurately.

FIG. 1 is a see-through view of essential parts inside a housing of a projector according to a first embodiment. FIG. 2 is a top view of the angle adjustment mechanism provided in the projector of the first embodiment. FIG. 3 is a perspective view of the angle adjustment mechanism provided in the projector according to the first embodiment, as viewed diagonally from above left. FIG. 4 is a diagram for explaining the inside of the angle adjustment mechanism provided in the projector of the first embodiment. FIG. 5 is an enlarged perspective view showing a second protruding portion of the holder member provided in the projector of the first embodiment. FIG. 6 is a perspective view of a sealing cover that seals a housing of the angle adjustment mechanism provided in the projector of the first embodiment. FIG. 7 is a perspective view of a first adjustment member of the angle adjustment mechanism. FIG. 8 is a perspective view of the second adjustment member of the angle adjustment mechanism. FIG. 9 is a perspective view for explaining the function of the first adjustment member of the angle adjustment mechanism. FIG. 10 is a perspective view for explaining the function of the second adjustment member of the angle adjustment mechanism. FIG. 11 is a see-through view of the main parts inside the housing of the projector according to the second embodiment.

Below, we will explain a projector that is an embodiment of an optical element angle adjustment device and an image projection device, with reference to the attached drawings.

[First embodiment]
(Projector Configuration)
Fig. 1 is a see-through view of the main parts inside the housing of the projector 100 of the first embodiment. As shown in Fig. 1, the housing 60 of the projector 100 of the first embodiment has an intake port 61 on the left side and an exhaust port 62 on the right side. A cooling air passage is formed between the intake port 61 and the exhaust port 62, and a cooling fan 63 provided at the exhaust port 62 causes air to flow.

Also provided within the housing 60 are the light source device 1, a fourth condenser lens 51 that condenses the light beam emitted from the light source device 1, and a first reflecting mirror 52 and a second reflecting mirror 53 that reflect the condensed light beam and guide it to the image forming panel 54. Also provided within the housing 60 are the image forming panel 54 and a projection lens 55 that projects the light of the image reflected by the image forming panel 54 onto the screen S.

The light source device 1 has a red (R) light source section 20, a green (G) light source section 30, and a blue (B) light source section 10. Each of the light source sections 10 to 30 has a substrate on which a red light source element 21, a green light source element 31, or a blue light source element 11 is provided. The light source device 1 also has a first condenser lens 24a and a second condenser lens 24b that collimate the red light emitted from the red light source element 21, and a heat sink 25 that dissipates heat generated by the red light source element 21, etc. Similarly, the light source device 1 has a first condenser lens 34a and a second condenser lens 34b that collimate the red light emitted from the green light source element 31, and a heat sink 35 that dissipates heat generated by the green light source element 31, etc. Similarly, the light source device 1 has a first condenser lens 14a and a second condenser lens 14b that collimate the blue light emitted from the blue light source element 11 into a parallel beam, and a heat sink 15 that dissipates heat generated by the blue light source element 11, etc.

Here, the first dichroic mirror 41 has the property of transmitting light in the blue wavelength range and reflecting light in the red wavelength range, and the second dichroic mirror 42 has the property of transmitting light in the blue and red wavelength ranges and reflecting light in the green wavelength range.

For this reason, the light emitted from the red light source element 21 is collimated by the first condenser lens 24a and the second condenser lens 24b, reflected by the first dichroic mirror 41, transmitted through the second dichroic mirror 42, and guided to the third condenser lens 43. Similarly, the light emitted from the green light source element 31 is collimated by the first condenser lens 34a and the second condenser lens 34b, reflected by the second dichroic mirror 42, and guided to the third condenser lens 43. In addition, the light emitted from the blue light source element 11 is collimated by the first condenser lens 14a and the second condenser lens 14b, transmitted through the first dichroic mirror 41 and the second dichroic mirror 42, and guided to the third condenser lens 43.

The third focusing lens 43 shapes the parallel light beams of each color into a minute spot. The light beams of each color shaped into a minute spot by the third focusing lens 43 are guided to the light tunnel 44. The light tunnel 44 multiple-reflects the guided light of each color inside, superimposing and adding the light of each color and homogenizing it. The light that passes through the light tunnel 44 is made into a parallel beam by the fourth focusing lens 51, reflected by the first reflecting mirror 52 and the second reflecting mirror 53, and irradiated onto the image forming panel 54.

The image forming panel 54 is driven based on image data supplied from an external input device such as a personal computer device, and forms projection light of a color image corresponding to the image data by reflecting the irradiated light of each color. This projection light is enlarged and projected onto the screen S via the projection lens 55. This allows the color image to be enlarged and displayed on the screen S.

(Configuration of Dichroic Mirror Angle Adjustment Mechanism)
Next, a description will be given of an angle adjustment mechanism for the first dichroic mirror 41 and the second dichroic mirror 42 provided in the projector 100 according to the first embodiment. The first dichroic mirror 41 and the second dichroic mirror 42 will be referred to as "optical mirrors" hereinafter.

Figure 2 is a top view of the angle adjustment mechanism, and Figure 3 is a perspective view of the angle adjustment mechanism as seen from diagonally above to the left. Also, Figure 4 is a diagram for explaining the inside of the angle adjustment mechanism. In Figure 4, Figure 4(a) is a side view of the angle adjustment mechanism, and Figure 4(b) is a cross-sectional view of line A-A in Figure 4(a).

As shown in Figs. 2 to 4, the angle adjustment mechanism has a holder member 220, which is an example of a mirror holding unit that holds an optical mirror, and a box-shaped housing 210 that houses the holder member 220. The angle adjustment mechanism also has a sealing cover 212 that seals the housing 210 in a state in which the holder member 220 is stored, and a first adjustment member 213 and a second adjustment member 214 for adjusting the angle of the holder member 220.

The holder member 220 has, for example, a rectangular shape and has a first protrusion 211a protruding from the bottom side of the holder member 220, and a second protrusion 211b protruding from the top side of the holder member 220. The first protrusion 211a and the second protrusion 211b are arranged coaxially along the center of the rectangular holder member 220.

As shown in Figs. 4(a) and 4(b), the first protrusion 211a is inserted into a cone-shaped recess 210a, which is an example of a bearing provided on the bottom surface of the housing 210 of the angle adjustment mechanism. The tip of the first protrusion 211a (the portion that abuts against the recess 210a) that is inserted into the recess 210a is machined into, for example, a hemispherical shape. This allows the holder member 220 to tilt and rotate without moving the center point of the holder member 220, within the range in which the first protrusion 211a can move within the cone-shaped recess 210a.

The shape of the tip of the first protrusion 211a may be a shape other than a hemisphere. However, if it is a sphere or a part of the shape of a spherical surface such as a hemisphere, the holder member 220 can be operated smoothly.

Figure 5 is an enlarged perspective view of the second protrusion 211b of the holder member 220. As shown in this Figure 5, the second protrusion 211b has a cylindrical protrusion 211e that protrudes from the upper surface side of the holder member 220, and a protrusion 211d that is coaxial with the cylindrical protrusion 211e and protrudes from the cylindrical protrusion 211e. The second protrusion 211b has a multi-step shape formed by the cylindrical protrusion 211e and the protrusion 211d that protrudes from the cylindrical protrusion 211e.

The protrusion 211d has a milled surface formed by cutting off a part of the outer periphery 211c, which has a cylindrical shape with a smaller diameter than the cylindrical protrusion 211e, along the optical axis direction. The protrusion 211d also has a milled surface formed by cutting off a part of the outer periphery 211c along the optical axis direction to form a surface parallel to the milled surface. By performing the cutting-off process to form such a pair of milled surfaces, the protrusion 211d has a roughly rectangular parallelepiped shape.

In this example, the protrusion 211d is in a substantially rectangular parallelepiped shape, but it may be in any shape that fits into the fitting hole 214b of the second adjustment member 214 described below without rotating. For example, it may be in a triangular prism shape or a polygonal shape with 5 or more sides. However, it is preferable that the shape does not rotate in the second adjustment member 214 when it fits into the fitting hole 214b.

Figure 6 is a perspective view of a portion of the sealing lid 212 of the housing 210 in the angle adjustment mechanism. The sealing lid 212 has a rectangular plate shape. As shown in Figure 2, the sealing lid 212 is screwed to the housing 210 in a manner that it covers the upper surface of the housing 210 in which the holder member 220 is provided. The sealing lid 212 has an elongated hole portion 212a into which the second protrusion portion 211b of the holder member 220 is inserted when the sealing lid 212 is screwed to the housing 210. The elongated hole portion 212a has a shape and size that allows the inserted second protrusion portion 211b to move along the longitudinal direction without rattling.

The sealing lid 212 also has a screw hole 212b for the first adjustment member 213. As will be described in detail later, after the optical mirror is adjusted, the first adjustment member 213 is fixed to the sealing lid 212 by a screw 230 via the screw hole 212b as shown in FIG. 2.

Figure 7 is a perspective view of the first adjustment member 213. As shown in this Figure 7, the first adjustment member 213 has a plate shape of a substantially equilateral triangle. Approximately in the center of this first adjustment member 213, a substantially rectangular fitting hole 213c that fits with the protrusion 211d of the holder member 220 is provided. In addition, the first adjustment member 213 is provided with a pair of screw holes 213a, 213b on either side of the fitting hole 213c.

Of these, one of the screw-fastening holes 213a has approximately the same shape and size as the elongated hole 212a provided in the sealing lid 212. Because this screw-fastening hole 213a is an elongated hole, it is possible to screw the first adjustment member 213 to the sealing lid 212 with a screw 241 as shown in FIG. 2 at a position according to the movement of the holder member 220. In contrast, the other screw-fastening hole 213b is a circular screw hole, and it is possible to screw the first adjustment member 213 to the sealing lid 212 with a screw 230 as shown in FIG. 2.

Figure 8 is a perspective view of the second adjustment member 214. As shown in this Figure 7, the second adjustment member 214 has an elongated hole portion 214a for screwing the second adjustment member 214 to the first adjustment member 213, and a fitting hole portion 214b that fits with the protrusion portion 211d of the holder member 220.

The long hole portion 214a is provided so that when the second adjustment member 214 is screwed to the first adjustment portion 213, the longitudinal direction is perpendicular to the longitudinal direction of one of the screw holes 213a provided in the first adjustment portion 213. The fitting hole portion 214b is a substantially rectangular hole portion into which the protrusion portion 211d of the holder member 220 fits with almost no gap.

(Dichroic mirror adjustment operation by angle adjustment mechanism)
In such an angle adjustment mechanism, the cylindrical protrusion 211e of the second protrusion 211b is inserted into an elongated hole 212a provided in the sealing cover 212, as shown in Fig. 9(a). This elongated hole 212a has an elongated hole shape so as to enable the holder member 220 to rotate in the Y rotation direction shown in Fig. 4(a). This allows the holder member 220 to move in the Y1 direction shown in Fig. 9(a) with the center of the first protrusion 211a inserted into the conical recess 210a as a fulcrum. Therefore, by rotating the holder member 220 in the Y rotation direction along the elongated hole 212a, the optical mirror surface 220a can be tilted obliquely upward or downward.

When adjusting and fixing the Y rotation position of the holder member 220, the protruding portion 211d of the holder member 220 protruding from the long hole portion 212a of the sealing lid 212 is fitted into the fitting hole portion 213c of the first adjustment member 213 as shown in FIG. 9(b). Then, the first adjustment member 213 is temporarily fixed to the sealing lid 212 by the screw 230 and the screw 241. In this state, the first adjustment member 213 can move along the longitudinal direction of the long screw fixing hole portion 213a, which is the Y2 direction shown in FIG. 9(b), with the screw 230 as a fulcrum.

Since the protrusion 211d of the holder member 220 is fitted into the fitting hole 213c of the first adjustment member 213, when the first adjustment member 213 is moved in the Y2 direction with the screw 230 as a fulcrum, the optical mirror surface of the holder member 220 tilts diagonally upward or downward (Y rotation: an example of rotation with respect to the first rotation direction). After adjusting the tilt angle of the optical mirror surface in this manner, the screws 230 and 241 are firmly tightened. This fixes the tilt angle of the optical mirror surface at the adjusted tilt angle.

Next, to adjust and fix the X rotation direction, which is a direction perpendicular to the Y direction on a plane, as shown in FIG. 10(a), the fitting hole 214b of the second adjustment member 214 is fitted into the protrusion 211d of the holder member 220 protruding from the first adjustment member 213. Then, as shown in FIG. 10(b), the second adjustment member 214 is temporarily fixed to the first adjustment member 213 by a screw 240. In this state, the second adjustment member 214 can move along the longitudinal direction of the elongated screw hole 214a, which is the X1 direction shown in FIG. 10(b), with the fitting hole 214b as a fulcrum.

The protrusion 211d of the holder member 220 fits into the fitting hole 214b of the second adjustment member 214. Therefore, when the second adjustment member 214 is moved in the X1 direction shown in FIG. 10(b), the optical mirror surface rotates left and right via the protrusion 211d of the holder member 220, which serves as a fulcrum, as shown in FIG. 10(a) (X rotation: an example of rotation in the second rotation direction).

After adjusting the left and right rotation angle of the optical mirror surface in this way, the screw 240 is tightly tightened. This fixes the second adjustment member 214 to the first adjustment member 213, and fixes the left and right rotation position of the optical mirror surface at the adjusted left and right rotation position.

The shape of the protrusion 211 of the holder member 220 is, for example, a rectangular prism shape, which fits into the fitting hole 214b of the second adjustment member 214 without rotation. This allows the left and right rotational position of the optical mirror surface to be adjusted with good operability and responsiveness.

In addition, by making the second protrusion 211b a multi-stage shape formed by the cylindrical protrusion 211e and the protrusion 211d protruding from the cylindrical protrusion 211e, the tilt angle and rotation position of the holder member 220 can be adjusted separately, simplifying the adjustment work. In addition, it is possible to perform adjustment with high precision.

(Effects of the First Embodiment)
As is clear from the above description, in projector 100 of the first embodiment, the angle adjustment mechanism has a first adjustment member 213 that adjusts the tilt angle (angle in the Y1 direction) of holder member 220 that holds optical mirrors such as dichroic mirrors 41 and 42. The angle adjustment mechanism also has a second adjustment member 214 that adjusts the left-right rotation position (rotation position in the X1 direction) of holder member 220. Then, each adjustment member 213, 214 adjusts the tilt angle and left-right rotation position of the optical mirror surface via holder member 220, and each adjustment member 213, 214 is screwed down.

As a result, the tilt angle and left/right position of the optical mirror surface can be precisely and easily adjusted while checking it, simply by rotating each of the adjustment members 213, 214. After this adjustment, the tilt angle and left/right position of the optical mirror surface can be easily and reliably maintained by simply screwing each of the adjustment members 213, 214.

The shape of the protrusion 211 of the holder member 220 is, for example, a rectangular prism shape, so that it fits into the fitting hole 214b of the second adjustment member 214 without rotating. This allows the adjustment of the left and right rotational positions of the optical mirror surface with good operability and responsiveness.

[Second embodiment]
Next, a projector according to a second embodiment will be described. In the case of the projector 100 according to the first embodiment described above, the tilt angle and left/right position of the first dichroic mirror 41 and the second dichroic mirror 42 are adjusted by the angle adjustment mechanism.

However, the angle adjustment mechanism can be used to adjust the tilt angle and left/right position of optical mirrors other than dichroic mirrors. As one example, FIG. 11 shows an angle adjustment mechanism for adjusting the tilt angle and left/right position of a wavelength-selective polarization separation element (half mirror) 113.

The projector shown in FIG. 11 has an illumination device 110, a light tunnel 121, a lens group 122, a mirror group 123, an image forming element 124, and a projection optical unit 125.

The lighting device 110 has a light source 111, a condenser lens 112, a wavelength-selective polarization separation element (half mirror) 113, a quarter-wave plate 114, a lens group 115, a color wheel 116, a lens group 117, and a phosphor wheel 118. The lighting device 110 sequentially emits blue light, red light, and green light in the same direction (on the same emission optical path) toward the light tunnel 121 in a time-division manner.

In the lighting device 110, the light source 111 emits a first light having a first linear polarization component. As an example, the light source 111 can be a laser diode that emits blue laser light having a P-polarized component (P wave) and a wavelength λB.

The light source 111 may be a light emitting diode (Light Emitting Diode) or an organic EL (Electro Luminescence) element that emits blue light, or a combination of these. Alternatively, a laser diode, a light emitting diode, an organic EL element, or the like that emits light in the ultraviolet wavelength region may be used, or a combination of these may be used.

The blue laser light emitted from the light source 111 is incident on the wavelength-selective polarization separation element 113 as a substantially parallel beam via the condenser lens 112. The wavelength-selective polarization separation element 113 has its tilt angle and left/right rotation position adjusted by the angle adjustment mechanism described in the first embodiment. The wavelength-selective polarization separation element 113 transmits the P waves and reflects the S waves of the P and S waves of wavelength λB from the light source 111.

The P-wave blue laser light incident on the wavelength-selective polarization separation element 13 passes through the wavelength-selective polarization separation element 113, converting the linearly polarized light into circularly polarized light, and is guided to the quarter-wave plate 114, which converts the circularly polarized light into linearly polarized light. The quarter-wave plate 114 converts the P-wave blue laser light into circularly polarized blue laser light, and irradiates it onto the color wheel 116 via the lens group 115.

The color wheel 116 has a configuration in which a disk-shaped member is divided into multiple sector-shaped regions (segments). Specifically, the color wheel 116 is divided into a total of three sector-shaped regions (segments): a red (R) region, a green (G) region, and a transparent transmissive region.

A driving unit 116m such as a stepping motor that rotates the color wheel 116 is provided at the axis of the color wheel 116. When the color wheel 116 is rotated at a predetermined timing by the driving of the driving unit 116m, the incident position of the light from the lens group 115 is switched to any one of the areas (segments) of the red (R) area, the green (G) area, and the transmissive area.

In other words, the wavelength of the light focused by the lens group 115 and the selectively arranged area (segment) at the incident position of the light from the lens group 115 determine whether the light incident on the color wheel 116 is transmitted through the color wheel 116 or reflected by the color wheel 116.

When the transmission area is positioned at the incident position of the light from the lens group 115, the blue laser light incident on the color wheel 116 passes through the color wheel 116 to become blue illumination light, which then enters the light tunnel 121. The blue illumination light that passes through the color wheel 116 is circularly polarized light, which reduces speckles that appear on a screen, etc.

On the other hand, when the red (R) or green (G) area is located at the incident position of the light from the lens group 115, the blue laser light incident on the color wheel 116 is reflected by the color wheel 116. The blue laser light reflected by the color wheel 116 then passes through the lens group 115 and enters the quarter-wave plate 114. The light incident on the quarter-wave plate 114 is converted from circularly polarized light to S-wave light, and enters the wavelength-selective polarization separation element 113. The S-polarized component is orthogonal to the P-polarized component.

The S-wave blue laser light incident on the wavelength-selective polarization separation element 113 is reflected by the wavelength-selective polarization separation element 113 and passes through the lens group 117 to enter the phosphor wheel 118. That is, the wavelength-selective polarization separation element 113 guides the S-wave (S-polarized) light to the phosphor wheel 118.

The lens group 117 is configured by appropriately combining, for example, biconvex lenses and plano-convex lenses, and has the function of converging an approximately parallel light beam into a spot on the phosphor wheel 18, and the function of converging the divergent light from the phosphor wheel 18 and converting it into an approximately parallel light beam.

The phosphor wheel 118 is formed by arranging a yellow phosphor on a disk-shaped member along the direction of rotation of the plate. The yellow phosphor uses the blue laser light as excitation light to produce yellow fluorescence with a longer wavelength than the blue laser light. A drive unit 118m, such as a stepping motor, that rotates the phosphor wheel 118 is provided at the axis of the phosphor wheel 118.

The yellow phosphor 181 of the phosphor wheel 118 uses the incident blue laser light as excitation light to produce yellow fluorescence with a longer wavelength than the blue laser light. The yellow fluorescence enters the wavelength-selective polarization separation element 113 via the lens group 117. Since the yellow fluorescence has a wavelength of, for example, 500 nm or more, it is reflected by the wavelength-selective polarization separation element 113 and enters the color wheel 116 via the quarter-wave plate 114 and the lens group 15.

The yellow fluorescence that enters the color wheel 116 is converted into red illumination light or green illumination light by the red (R) area or green (G) area, and enters the light tunnel 121. The illuminance distribution of each illumination light is made uniform by the light tunnel 121, and the illumination light passes through the lens group 122 and is reflected by the mirror group 123 to be irradiated onto the image forming element 124.

The image forming element 124 forms a color projection image by controlling the gradation of each illumination light for each pixel. For example, a DMD (Digital Micro Mirror Device) can be used as the image forming element 124. A DMD has a micromirror for each pixel, and each micromirror can be maintained at one of two different angles.

That is, each micromirror of the DMD is either at an angle that reflects each illumination light toward the projection optical unit 125 (ON state), or at an angle that reflects each illumination light toward an internal absorber and does not emit it to the outside (OFF state). This makes it possible to control the light projected for each pixel to be displayed. Also, with the DMD, the time ratio of the ON state of each micromirror is adjusted using a pulse width modulation method (PWM method), making it possible to express gradations for each pixel to be displayed.

The image forming element 124 is not limited to a DMD, and may be, for example, a liquid crystal or the like, as long as it is an element capable of forming a color projection image using the illumination light from the illumination device 10.

The red, green, and blue illumination lights are irradiated to the image forming element 124 in a time-division manner at the timing of generating an image, and after the gradation is controlled for each display pixel by the image forming element 24, the light is projected onto a screen or the like via the projection optical unit 125. Then, due to the persistence of vision in the eye, a color image is visually recognized through the screen or the like.

(Effects of the Second Embodiment)
In the projector of the second embodiment, the angle adjustment mechanism adjusts the tilt angle and left/right position of the wavelength selective polarization separation element (half mirror) 113. Therefore, by simply rotating the adjustment members 213 and 214, the tilt angle and left/right position of the wavelength selective polarization separation element 113 can be accurately and easily adjusted while checking (simplification of adjustment work), and the same effects as those described above can be obtained.

Finally, the above-described embodiments are presented as examples and are not intended to limit the scope of the present invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention.

For example, in a projector, which is a device that splits light using optical elements and uses multiple colored lights, the number of optical elements is large, which inevitably requires more adjustment work. However, in the case of the present invention, the adjustment work of the optical elements can be simplified as described above. This makes it possible to shorten the time required to adjust a large number of optical elements and significantly reduce the amount of work.

For example, the first adjustment member 213 and the second adjustment member 214 are fixed with screws, but they may be fixed with other fixing means such as adhesive.

The present invention can also be applied to various devices that have optical elements such as mirrors, such as camera devices, printer devices, 3D printer devices (three-dimensional modeling devices), and 3D scanner devices.

In other words, while each of the above-described embodiments is an example in which the present invention is applied to a projector that projects an image onto a screen or the like, the present invention can be applied to various devices that have optical elements arranged on the optical path, even if they are not projectors. As one example, the present invention can be applied to a stereolithography 3D printer device that has a laser as a light source unit inside. Also, some stereolithography 3D printer devices have an ultraviolet light source as a light source unit and a DMD as an image forming unit. The present invention can also be applied to optical elements on the optical path within these devices.

The 3D scanner device also has inside it a light source, such as a laser light source, that emits light, and a light receiving unit that receives reflected light from the object to be scanned. The present invention can also be applied to optical elements on the light path inside these devices.

The present invention can also be applied to optical elements on the optical path in a laser printer device having a light source unit used for writing, or an imaging device such as a camera device.

Furthermore, the embodiments and variations of each embodiment are within the scope and spirit of the invention, and are also within the scope of the invention and its equivalents described in the claims.

41 First dichroic mirror 42 Second dichroic mirror 100 Projector 210a Cone-shaped recess 211a First protruding member 211b Second protruding member 211c Outer periphery of protruding portion 211d Protruding portion 211e Cylindrical protruding portion 212 Sealing cover 212a Long hole portion 213 First adjustment member 214 Second adjustment member 214a Long hole portion 220 Holder member

JP 2002-90876 A

Claims (5)

a mirror holder that holds the optical mirror;
a first protrusion and a second protrusion provided on the mirror holding portion so as to protrude on the same axis from positions opposed to each other across the optical mirror;
a bearing portion that supports the first protrusion;
a first adjustment member that fits into the second protrusion and tilts the mirror holding portion in a first direction with a center of the first protrusion as a fulcrum ;
a second adjustment member that fits into the second protruding portion protruding from the first adjustment member and rotates the mirror holding portion in a second direction about the axis as a rotation axis via the second protruding portion,
an optical element angle adjustment device comprising : a first adjustment member for adjusting a position of the second protrusion, thereby adjusting the tilt angle of the mirror holding part in the first direction ; a second adjustment member for adjusting a rotation angle of the second adjustment member in the second direction , thereby rotating the mirror holding part via the second protrusion; and after adjusting the rotational position of the mirror holding part, fixing the respective positions of the first adjustment member and the second adjustment member with a fixing member. the first protrusion has a hemispherical portion that contacts the bearing portion,
The optical element angle adjustment device according to claim 1 , wherein the bearing portion has a conical shape. 3. The optical element angle adjustment device according to claim 1 or 2, characterized in that the second protrusion has a multi-step shape including a cylindrical protrusion inserted into an elongated hole provided in a sealing lid that seals the mirror holding portion , and an engagement protrusion provided to protrude from the cylindrical protrusion and engage with the second adjustment member. The optical element angle adjusting device according to claim 3 , wherein the fitting protrusion has a prismatic shape. The optical element angle adjustment device according to any one of claims 1 to 4,
A light source unit that irradiates light;
a color wheel including a plurality of colored segments and configured to convert light from the light source unit into light corresponding to the colors of the segments;
An image projection device that forms and projects an image from light passing through each segment of a color wheel in synchronization with the rotational position of the color wheel.

Images