WO2011013627A1 - 光学ユニット - Google Patents
光学ユニット Download PDFInfo
- Publication number
- WO2011013627A1 WO2011013627A1 PCT/JP2010/062539 JP2010062539W WO2011013627A1 WO 2011013627 A1 WO2011013627 A1 WO 2011013627A1 JP 2010062539 W JP2010062539 W JP 2010062539W WO 2011013627 A1 WO2011013627 A1 WO 2011013627A1
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- WIPO (PCT)
- Prior art keywords
- light
- elliptical mirror
- focal point
- mirror
- point
- Prior art date
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0605—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors
- G02B17/0621—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0019—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
- G02B19/0023—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors) at least one surface having optical power
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
Definitions
- the present invention relates to an optical unit using an elliptical mirror constituted by a part or all of the inner peripheral surface of an ellipsoid formed when an ellipse is rotated around a predetermined rotation axis.
- optical units that use a parabolic mirror having a reflecting surface that is a parabolic surface that is formed when a parabola is rotated around the elliptical mirror or a predetermined rotation axis
- the optical unit described in Patent Document 1 can adjust the direction of light flux and the cross-sectional shape (irradiation shape, spot shape) of light.
- the optical unit described in Patent Document 1 when the direction of the light beam is changed, the cross-sectional shape is also changed.
- This optical unit is provided with a moving mechanism for moving the parabolic mirror, and the changed cross-sectional shape can be corrected to some extent by moving the parabolic mirror by the moving mechanism.
- the optical unit described in Patent Document 1 cannot adjust the irradiation area (spot area) at all.
- the irradiation area can be adjusted by moving the parabolic mirror.
- an object of the present invention is to provide an optical unit capable of outputting well-made light by changing the irradiation area.
- the second optical unit of the present invention that solves the above-described object includes a predetermined point at which light derived from light emitted from a light source starts to diffuse, A first focal point and a second focal point are formed on a part or all of an inner peripheral surface of an ellipsoid formed when an ellipse is rotated around a predetermined rotational axis, and the first focal point has the first focal point and the second focal point on the rotational axis.
- An elliptical mirror that matches the predetermined point and reflects light that has passed through the predetermined point; Adjustment means capable of adjusting the position on the elliptical mirror where the light passing through the predetermined point hits the elliptical mirror while maintaining the state where the first focal point coincides with the predetermined point; The adjusting means rotates the elliptical mirror about a rotational axis that intersects the optical axis of diffused light passing through the predetermined point and reaching the elliptical mirror at the predetermined point. It is characterized by that.
- the focal point where the incident parallel light is reflected or refracted and converges coincides with the second focal point, and the light passing through the second focal point is reflected or refracted to produce the parallel light.
- An optical member to be generated may be provided.
- the optical member referred to here may be a parabolic mirror having a paraboloid formed as a reflecting surface when a parabola is rotated about a predetermined rotation axis.
- the adjusting means may change at least one of the traveling direction of the diffused light and the angle at which the diffused light extends until it passes through the predetermined point and reaches the elliptical mirror. It may be changeable in a state where one focal point is made coincident with the predetermined point.
- the moving mechanism which moves both the said reflection member and the said elliptical mirror so that the light which passed the said predetermined point may hit the same position on the said elliptical mirror with a speed difference may be sufficient. That is, the moving mechanism may move the reflecting member by following the elliptical mirror so that light passing through the predetermined point hits the same position on the elliptical mirror. The moving mechanism may rotate the elliptical mirror at a predetermined angular velocity and rotate the reflecting member at an angular velocity that is 1 ⁇ 2 of the predetermined angular velocity.
- the adjusting means may rotate the elliptical mirror around the first focal point, A screen for receiving light reflected by the elliptical mirror,
- the elliptical mirror has an initial posture in which the rotation axis and the optical axis of the diffused light that has passed through the predetermined point are positioned on the same horizontal plane and the rotation axis passes through the center point of the screen. It may be a thing.
- the screen may be arranged based on the position of the second focal point of the elliptical mirror that is rotated by the adjusting means. That is, the orientation of the rotating elliptical mirror changes continuously, and the second focal point in the elliptical mirror whose orientation changes continuously is plotted in accordance with the rotation of the elliptical mirror. It becomes a predetermined arc.
- the screen may be arranged on the arc, or arranged on a tangent line of the arc perpendicular to the rotation axis when the elliptical mirror is in the initial posture. There may be.
- the first focus is adjusted while maintaining the same position on the elliptical mirror where the light that has passed through the predetermined point adjusted by the adjusting means hits the elliptical mirror.
- the aspect provided with the direction change means to rotate the said elliptical mirror about the rotation center may be sufficient.
- the direction of the reflected light can be changed without changing the irradiation area.
- an optical path correction member is provided between the predetermined point and the elliptical mirror,
- the optical path correction member is The diameter is gradually increased from the entrance provided at the position of the predetermined point toward the exit, and the inner peripheral surface reflects the light incident from the entrance and the outer peripheral surface also reflects the light.
- An inner reflecting mirror in which the focal point of the elliptical mirror is located between the exit ports; The incident surface located between the inner peripheral surface and the entrance of the inner reflector is arranged so that the inner peripheral surface that reflects light is spaced from the outer peripheral surface of the inner reflector and surrounds the outer peripheral surface.
- An outer reflector A lens that acts on the light so that light incident from the entrance and the entrance-side opening is focused between the entrance and the exit as viewed from the elliptical mirror An aspect may be sufficient.
- the predetermined point When the predetermined point is viewed as one point whose area is as close as possible to zero, even if it is intended to focus light originating from the light emitted from the light source to that one point, the light is actually only emitted to a region having a certain area. Cannot be focused. Therefore, the focal point of the elliptical mirror is deliberately shifted so that the first focal point of the elliptical mirror is between the predetermined point and the elliptical mirror, and the predetermined point is at the position of the entrance. Make it come. By providing the lens, light can be diffused from the focal point where the area is close to zero.
- the lens may be a central lens that covers the exit port of the inner reflecting mirror, or an outer lens that covers the exit side opening. Further, when both the central lens and the outer peripheral lens are provided as the lens, the central lens is preferably a concave lens having a short focal length, and the outer peripheral lens is a concave lens having a shorter focal length than the central lens. Is preferred.
- optical unit of the present invention it is possible to output arranged light with changing the irradiation area.
- FIG. 14 is a cross-sectional view of the optical path correction member shown in FIG. 13 taken along the line A-A ′.
- FIG. 1 is a diagram showing an embodiment of the optical unit of the present invention.
- the optical unit 11 shown in FIG. 1 has a pinhole 110, an elliptical mirror 111, and a parabolic mirror 112.
- the optical unit 11 shown in FIG. 1 a light source unit 21 is shown.
- the light source unit 21 shown in FIG. 1 includes a light emitting diode (LED) 211 that is a light source that emits diffused light, and a condensing member 212 including one lens or a lens group. Note that a filament, a light bulb, or the like can be used instead of the light emitting diode 211.
- the light source may be of any kind, structure, and size as long as it emits diffuse light.
- An elliptical mirror 111 shown in FIG. 1 is an off-axis elliptical mirror constituted by a part of the inner peripheral surface of an ellipsoid formed when an ellipse is rotated around a predetermined rotational axis R1.
- the first focal point f1 of the elliptical mirror 111 coincides with the pinhole 110, and the light that has passed through the pinhole 110 is reflected by the elliptical mirror 111 and converges to the second focal point f2.
- a parabolic mirror 112 shown in FIG. 1 is an off-axis parabolic mirror constituted by a part of a surface (parabolic surface) formed when a parabola is rotated around a predetermined rotation axis R2.
- the parabolic mirror reflects light incident from the focal side of the parabolic mirror parallel to the rotation axis and focuses it on the focal point.
- the focal point f3 of the paraboloidal mirror 112 shown in FIG. 1 (the focal point where the incident parallel light is reflected or refracted and converged) coincides with the second focal point f2, and due to the above properties, the parabolic mirror 112 has a focal point.
- the light emitted from the focal point f3 is reflected by the parabolic mirror 112 and becomes light parallel to the rotation axis R2 (parallel light). That is, the parabolic mirror 112 reflects parallel light passing through the second focal point f2 to generate parallel light, and corresponds to an example of an optical member according to the present invention.
- the optical unit 11 shown in FIG. 1 has a moving mechanism 113 for manually moving the light source unit 21.
- the moving mechanism 113 is represented by a thick arrow.
- the elliptical mirror 111 is fixedly arranged, and the moving mechanism 113 keeps the first focal point f1 of the elliptical mirror 111 coincident with the pinhole 110 while keeping the light source unit 21 in the optical unit 11.
- This is a mechanism that rotates around the pinhole 110 as a rotation center. That is, the moving mechanism 113 shown in FIG. 1 rotates the optical path of the light Ls focused on the pinhole 110 around the first focal point f1.
- FIG. 1 the moving mechanism 113 for manually moving the light source unit 21.
- the moving mechanism 113 is represented by a thick arrow.
- the elliptical mirror 111 is fixedly arranged, and the moving mechanism 113 keeps the first focal point f1 of the elliptical mirror 111 coincident with the pinhole 110 while keeping the light source unit 21 in the optical
- the light source unit 21 is rotated by the moving mechanism 113, and diffused light emitted from each of three different positions (first position to third position) passes through the pinhole 110 and enters the elliptical mirror 111.
- the way to head is shown.
- the traveling direction of the light passing through the pinhole 110 is different, and the position on the elliptical mirror 111 where the light hits the elliptical mirror 111 is also different. Therefore, the moving mechanism 113 shown in FIG. 1 corresponds to an example of the adjusting means in the first optical unit of the present invention. Further, the size of the reflection regions r1 to r3 of the elliptical mirror 111 that reflects the light that has passed through the pinhole 110 also changes.
- the light (focused light) L12 reflected by the reflection region r1 is focused on the second focus f2 that coincides with the focus f3 of the parabolic mirror 112, and the light (diffused light) L13 that has passed through the second focus f2 is Reflected by the parabolic mirror 112 and output as parallel light L14 having a relatively small irradiation area (spot area).
- spot area irradiation area
- the light (focused light) L32 reflected by the reflection region r3 is focused on the second focus f2 that coincides with the focus f3 of the parabolic mirror 112, and the light (diffused light) L33 that has passed through the second focus f2 is It is reflected by the parabolic mirror 112 and output as parallel light L34 having a relatively large irradiation area.
- the second position that is intermediate between the first position and the third position is an intermediate distance until the light (diffused light) L21 that has passed through the pinhole 110 reaches the elliptical mirror 111.
- the size of the reflective region r2 is also a position that becomes an intermediate size. Further, the reflection region r2 is between the reflection region r1 and the reflection region r3.
- the light (focused light) L22 reflected by the reflection region r2 is focused on the second focus f2 that coincides with the focus f3 of the parabolic mirror 112, and the light (diffused light) L23 that has passed through the second focus f2 is The light is reflected by the parabolic mirror 112 and output as parallel light L24 having an irradiation area having an intermediate size.
- the irradiation area of the parallel light to be output is in the relationship of parallel light 34> parallel light 24> parallel light 14, but any parallel light is related to the rotation axis R2 of the parabolic mirror 112.
- the parallel light is directed in a parallel predetermined direction. In the optical unit 11 shown in FIG. 1, the direction of the output light is constant.
- the elliptical mirror 111 is fixedly arranged, and the pinhole 110 does not move either. Therefore, also in this optical unit 31, the first focal point f1 of the elliptical mirror 111 always coincides with the pinhole 110. Further, the light source unit 21 makes the light source 221 and the lens of the light collecting member 222 independent of each other so that the first focus f1 of the elliptical mirror 111 always coincides with the pinhole 110 by the moving mechanism 313 (see arrow). By moving the pinhole 110 forward and backward, the position on the elliptical mirror 111 where the light passing through the pinhole 110 hits the elliptical mirror 111 is changed.
- the light emitting diode 211 moves while being guided by one of the guide grooves.
- the light collecting member 212 moves while being guided by another guide groove.
- the light source unit 21 indicated by the solid line moves to the position of the light source unit 21 indicated by the dotted line
- the light source unit 21 indicated by the dotted line moves to the position of the light source unit 21 indicated by the solid line.
- the angles at which the light (diffused light) L41 and L51 spread through the pinhole 110 and reach the elliptical mirror 111 are different.
- the angle at which the diffused light L41 spreads is relatively small. Conversely, if the light source unit 21 is relatively close to the pinhole 110, The angle at which the diffused light L51 spreads is relatively large.
- the reflection regions r4 and r5 in the elliptical mirror 111 are also narrowed when the light source unit 21 is relatively far from the pinhole 110, and widened when the light source unit 21 is relatively close to the pinhole 110. Furthermore, the wider the reflection area in the elliptical mirror 111, the wider the irradiation area of the output parallel light L44, 54.
- any parallel light is parallel light directed in a predetermined direction parallel to the rotation axis R2 of the parabolic mirror 112, and the direction of the output light is constant.
- a point light source for example, a diameter of about 0.5 mm is provided at the pinhole 110 position.
- a light emitting diode may be provided.
- FIG. 3 is a diagram showing a second embodiment of the optical unit of the present invention.
- the optical unit 41 includes a plane mirror 400.
- the plane mirror 400 is provided at the position of the pinhole 110 (first focal point f1), and changes the orientation with respect to the elliptical mirror 111 by being rotated by an operator's operation with the position of the pinhole 110 as a rotation center. (See the arrows in the figure).
- the plane mirror 400 is shown by a solid line and a dotted line.
- the light Ls focused on the pinhole 110 is reflected by the plane mirror 400 and directed to the elliptical mirror 111.
- the position at which the light (diffused light) L61 reflected by the plane mirror 400 indicated by the solid line hits the elliptical mirror 111 is different from the position at which the light (diffused light) L71 reflected by the plane mirror 400 indicated by the dotted line hits the elliptical mirror 111,
- the rotating plane mirror 400 also corresponds to an example of the adjusting means in the first optical unit of the present invention.
- the plane mirror 400 indicated by the solid line has a smaller incident angle ⁇ than the plane mirror 400 indicated by the dotted line, and the reflection regions (r6, r7) reflected by the elliptical mirror 111 are also reflected by the plane mirror 400 indicated by the solid line (diffusion).
- the light (L) L61 is larger than the light (diffused light) L71 reflected by the plane mirror 400 indicated by the dotted line.
- the wider the reflection area in the elliptical mirror 111 the larger the irradiation area of the output parallel light L64, 7, but any of the parallel light L64, 74 will be a parabolic mirror 112.
- the parallel light is directed in a predetermined direction parallel to the rotation axis R2, and the direction of the output light is constant.
- another optical member such as a lens
- refracts or reflects the light Ls focused on the pinhole 110 and directs it toward the elliptical mirror 111 may be used.
- the power for moving the light source unit 21, rotating the plane mirror 400, and rotating the elliptical mirror 111 can be reduced by a human operation force in order to reduce costs and simplify the structure.
- it may be power generated by an electric drive means such as a motor or a solenoid.
- the parabolic mirror 112 is omitted, a unit for adjusting the irradiation area of the light (focused light) L12 reflected by the elliptical mirror 111, or the light (diffused light) L13 passed through the second focal point f2, etc. It can also be used as a unit for adjusting the irradiation area.
- a first parabolic mirror (off-axis parabolic mirror) and a second parabolic mirror (off-axis parabolic mirror) are prepared, and a light source unit is provided at the focal point of the first parabolic mirror.
- the 21 pinholes 110 are matched.
- the light that has passed through the pinhole 110 is reflected by the reflecting surface, which is the parabolic surface of the first parabolic mirror, and becomes the first parallel light.
- a surface (parabolic surface) formed by rotating the first parabola around a predetermined rotation axis is formed by a mirror, and the first parallel light is The light is parallel to the rotation axis.
- the second paraboloid mirror has a paraboloid formed when the second parabola is rotated about a predetermined rotation axis parallel to the rotation axis of the first paraboloid mirror. Accordingly, the first parallel light parallel to the rotation axis of the first parabolic mirror is light parallel to the rotation axis of the second parabolic mirror. The first parallel light is reflected again by the second parabolic mirror. The light reflected by the second parabolic mirror is focused on the focal point of the second parabolic mirror.
- an elliptical mirror 111 having a first focal point f1 coincident with the focal point of the second parabolic mirror is provided.
- the light focused on the focal point of the second parabolic mirror is further reflected by the elliptical mirror 111 and converged again toward the second focal point f2 of the elliptical mirror 111.
- a moving mechanism for moving the pinhole 110 and the first parabolic mirror is provided. Note that moving the pinhole 110 also moves the light source unit 21.
- the power of the moving mechanism here may be power generated by an electric drive means such as a motor or a solenoid, or may be an operating force by a person.
- This moving mechanism keeps the rotation axis of the first parabolic mirror and the rotation axis of the second parabolic mirror parallel to each other with the focal point of the first parabolic mirror aligned with the pinhole 110.
- the first paraboloidal mirror is moved as it is.
- the position on the elliptical mirror where the light passing through the focal point of the second parabolic mirror hits the elliptical mirror 111 is also changed.
- the projector described below scans light corresponding to a pixel in the vertical direction and also in the horizontal direction based on image data representing an image composed of a plurality of pixels arranged in a horizontal direction and a vertical direction. This is a scanning projector that irradiates while scanning.
- FIG. 4 is a view showing a third embodiment of the optical unit of the present invention.
- FIG. 4 shows the elliptical mirror 111 in the first position and the second position.
- the first position is a position where the second focal point f2 of the elliptical mirror 111 is upward in the figure
- the second position is a position where the second focal point f2 is downward in the figure.
- the position where the light (diffused light) that has passed through the pinhole 110 hits the elliptical mirror 111 is different. That is, when the elliptical mirror 111 is in the first position, the light (diffused light) L81 that has passed through the pinhole 110 is reflected by the reflection region r8 of the elliptical mirror 111, but the elliptical mirror 111 is in the second position. Sometimes, the light (diffused light) L91 that has passed through the pinhole 110 is reflected by the reflection region r9 of the elliptical mirror 111.
- a turning mechanism represented by an arrow in FIG.
- the reflection area of the elliptical mirror 111 becomes wider as the elliptical mirror 111 rotates upward and becomes narrower as it rotates downward. Therefore, when the elliptical mirror 111 is at the first position, the reflection region r8 is relatively wide, and when the elliptical mirror 111 is at the second position, the reflection region r9 is relatively narrow.
- the parabolic mirror 112 is removed from the optical unit 51, and a flat screen 55 is provided instead.
- the screen 55 shown in FIG. 4 is disposed vertically between the first focal point f1 and the second focal point f2 of the elliptical mirror 111.
- the screen 55 is irradiated with light (converged light) L82 and 92 reflected by the elliptical mirror 111 and directed toward the second focal point f2.
- the irradiation area of the light L82, 92 irradiated to the screen 55 is larger when the elliptical mirror 111 is at the first position than when it is at the second position.
- the optical unit 51 of the third embodiment is incorporated in a projector (for example, incorporated as an output unit), the elliptical mirror 111 is used as a scanning optical system, and the elliptical mirror 111 is rotated upward as the projection position goes upward to output light. It is possible to output a thick outgoing light by increasing the irradiation area.
- the screen 55 is disposed between the first focal point f2 and the second focal point f2, but the screen 55 is viewed in the traveling direction of the light (converged light) L82 and 92 reflected by the elliptical mirror 111. You may provide in the downstream rather than the 2nd focus f2. Even when the screen is provided on the downstream side, the irradiation area can be adjusted according to the rotation of the elliptical mirror 111 as described above.
- light L82 and L92 that are to be focused toward the second focal point f2 is used, and these lights L82 and 92 are light that is arranged as focused light. Further, the irradiation area of these lights (focused lights) L82 and 92 can be changed and output.
- FIG. 5 is a diagram showing a fourth embodiment of the optical unit of the present invention.
- the optical unit 61 shown in FIG. 5 is also incorporated as an output unit of the projector 60, and the elliptical mirror 111 is used as a scanning optical system that performs scanning at least in the vertical direction. That is, the projector 60 also performs horizontal scanning and vertical scanning of the output light, and outputs a plurality of stages of output light (horizontal scanning lines) scanned in the horizontal direction in the vertical direction.
- the elliptical mirror 111 rotates around the first focal point f1 as a rotation center.
- the light source unit 21 is fixedly arranged, and the pinhole 110 maintains a state coincident with the first focal point f1 of the elliptical mirror 111.
- the projector 60 can adjust the interval between horizontal scanning lines (interval where output light scanned in the horizontal direction is adjacent in the vertical direction). That is, if the motor (not shown) that rotates the elliptical mirror 111 in the vertical direction (see the arrow in the figure) is electrically controlled to reduce the rotational speed of the elliptical mirror 111, the horizontal scanning lines are spaced apart from each other. Becomes (narrows). When the scanning line interval is adjusted by controlling the light emission interval at a constant vertical scanning angular velocity, the horizontal scanning rate may be controlled accordingly.
- the horizontal scanning speed is increased as the projection position goes upward, and at the same time, the light emitting diode 211 (predetermined light source) emits light in the light emission interval (in order to switch the horizontal scanning line to the next horizontal scanning line) What is necessary is just to shorten the light off time).
- the control unit 617 provided in the projector 60, and the above-described problem that the interval between the scanning lines increases as the projection position goes upward is solved.
- FIG. 5 shows a locus T1 of the second focal point f2 when the elliptical mirror 111 is rotated about the first focal point f1.
- the screen may be arranged with reference to the locus T1. If the screen is arranged on an arc indicated by the locus T1, the irradiation area is uniform and minimized. Further, the arrangement position of the screen is not limited to the arc indicated by the locus T1.
- the elliptical mirror and the light source unit are omitted for the sake of clarity, but the elliptical mirror has a flat shape with a short short radius, and the optical unit is fixedly disposed above the elliptical mirror.
- the pinhole 110 maintains a state that coincides with the first focal point f1 of the elliptical mirror.
- the traveling direction of the light that has become diffused light through the pinhole 110 is a certain direction from top to bottom.
- the certain direction is indicated by an arrow, and this certain direction is a predetermined direction from the upper front side of the paper toward the lower back side of the paper surface, or a predetermined direction from the upper rear side of the paper surface to the lower front side of the paper surface.
- the pinhole 110 If the position of the second focus f2 when the first focus f1 and the second focus f2 of the elliptical mirror are horizontal is referred to as the 3 o'clock position as the position when the hour hand of the clock indicates 3 o'clock, the pinhole 110 The light that has passed through and becomes diffused light travels toward the 6 o'clock position.
- the light irradiated to the 6 o'clock position is not the light reflected by the elliptical mirror but the diffused light D that has passed through the pinhole 110.
- it may be referred to as a position at o in the same manner.
- FIG. 6 the locus T1 of the second focus when the elliptical mirror is rotated with the first focus f1 as the rotation center is indicated by the circumference of the reference perfect circle C1.
- FIG. 6 four circles C2 to C5 are shown on the first focal side (inside) from the circumference of the reference perfect circle C1. These four circles C2 to C5 are inscribed in the reference true circle C1 at the 6 o'clock position.
- FIG. 7 is a diagram showing a position where the irradiation areas become equal when the angle of spread of the light that has passed through the first focus f1 and becomes diffused light has spread to about several tens of degrees.
- an elliptical mirror (not shown) having a short radius is used to some extent in order to show a large irradiation area.
- the locus T1 of the second focus when the elliptical mirror is rotated with the first focus f1 as the rotation center is indicated by the circumference of the reference perfect circle C1.
- the short thick line represents the irradiation area, and all the thick lines are shown to have the same length, and it can be seen that the irradiation areas are equal at the positions where the thick lines are shown. Curves circumscribing these thick lines are different from the circumferences of the circles C3 and C4 shown in FIG.
- FIG. 8 is a diagram for explaining that the screen is arranged at a position where the irradiation area is equal between the top and bottom of the screen.
- the screen is arranged so as to circumscribe the curve connecting the positions where the irradiation areas are equal.
- Screens 5501, 5511, 5521, 5531, and 5541 circumscribed on the circumference of the reference perfect circle C1 shown in FIG. 8 are orthogonal to the rotation axis R1 (see FIG. 1) of the elliptical mirror extending in the direction of the respective positions. And it is arranged on the tangent line of the reference perfect circle C1.
- the irradiation area is minimized on the circumference of the reference perfect circle C1, and the size of the pixels constituting the image to be displayed is also minimized. Therefore, the highest-definition display is performed on the circumference of the reference perfect circle C1.
- FIG. 8 an image having the same number of pixels is displayed over the entire screen, and the screen size is varied according to the size of the pixel (the size of the irradiation area). For this reason, the screen size increases as the distance from the circumference of the reference perfect circle C1 increases.
- FIG. 8 shows screens 5501 to 5503 arranged at the 12 o'clock position, screens 5511 to 5514 arranged at the 1 o'clock position, screens 5521 to 5525 arranged at the 2 o'clock position, and arranged at the 3 o'clock position. Shown are screens 5531-5535 and screens 5541-5545 arranged at the 4 o'clock position. In addition, one screen is arranged at the 1 o'clock position and two screens are arranged at the 2 o'clock to 4 o'clock position on the side (outside) opposite to the first focus f1 from the circumference of the reference perfect circle C1. .
- FIG. 9 is a diagram collectively showing a plurality of screens shown in FIG.
- FIG. 9A shows all the screens 5501 to 5545 shown in FIG. 8 so that the rotation axes R1 (major axes) connecting the first focus f1 and the second focus f2 of the elliptical mirror 111 overlap.
- the rotation axis R1 is a center line in the vertical scanning direction. For example, if it is shown collectively at the 12 o'clock position shown in FIG. 8, the screens shown at the 1 o'clock, 2 o'clock, 3 o'clock and 4 o'clock positions will be shown in a rotated state.
- FIG. 9A shows all the screens 5501 to 5545 shown in FIG. 8 so that the rotation axes R1 (major axes) connecting the first focus f1 and the second focus f2 of the elliptical mirror 111 overlap.
- FIG. 9A shows all the screens 5501 to 5545 shown in FIG. 8 so that the rotation axes R1 (major axes) connecting the first focus f1 and the second focus f2
- the screens 5501, 5511, 5521, 5531, and 5541 arranged on the circumference of the reference perfect circle C1 are one place (the place where the optical axis of the emitted light intersects the circumference of the reference perfect circle C1). ).
- These screens 5501, 5511, 5521, 5531, and 5541 are screens in which the size of pixels constituting an image to be displayed is the smallest.
- the size of the pixel is classified into three levels of large, medium, and small.
- the screen installation area SS where the size of the pixel is small is indicated by a two-dot chain line. Surrounding.
- the screen installation area SM in which the size of the pixels constituting the image to be displayed is medium is surrounded by a two-dot chain line.
- the screen installation area SL in which the size of the pixels constituting the image to be displayed is large is surrounded by a two-dot chain line.
- the screens having the same pixel size are contained in a grouped area.
- the screen has a similar inclination.
- FIG. 10 is a view showing a fifth embodiment of the optical unit of the present invention.
- a light source unit 29 capable of full color display is incorporated in the optical unit 71 shown in FIG.
- the light source unit 29 includes a light source 28 having a red light emitting diode 281R, a light source 28 having a green light emitting diode 281G, and a light source 28 having a blue light emitting diode 281B.
- Each light source 28 includes a light emitting diode 281 of a predetermined color and an elliptical mirror (partial elliptical mirror) 282 that serves as a condensing member.
- the light emitting diodes 281R, 281G, and 281B of the respective colors are provided at the position of the first focal point of each elliptical mirror 282.
- the second focal points fb of the elliptical mirrors 282 coincide with each other.
- Light emitted from the light emitting diodes 281R, 281G, and 281B of the respective colors is reflected by the respective elliptical mirrors 282, and is focused on the second focal point fb of the elliptical mirror 282 at a sharp angle.
- the second focal point fb of the elliptical mirror 282 corresponds to the pinhole 110, and the light source unit 29 emits light focused on the pinhole 110.
- the optical unit 71 shown in FIG. 10 has an elliptical mirror 111 that reflects light from the light source unit 29 separately from the elliptical mirror 282 of the light source unit 29.
- the elliptical mirrors 282 of the light emitting diodes 281R, 281G, and 281B of the respective colors of the light source unit 29 are referred to as light source side elliptical mirrors 282, and the elliptical mirror 111 that reflects light from the light source unit 29 is referred to as the scanning side elliptical mirror 111. Distinguish between the two.
- the second focal point fb of the light source side elliptical mirror 282 coincides with the first focal point f1 of the scanning side elliptical mirror 111.
- the optical unit 71 in the fifth embodiment it is handled as a default that the screen is placed vertically at the 12 o'clock position shown in FIG. That is, the light emitting diodes 281R, 281G, and 281B of the respective colors are arranged on the second focal point f2 side opposite to the scanning elliptical mirror 111 with respect to the first focal point f1 of the scanning elliptical mirror 111, and on the opposite side thereof. Treat the screen as vertical by default.
- the direction in which the diffused light travels through the pinhole 110 and reaches the scanning elliptical mirror 111 is the horizontal direction from the right side to the left side.
- FIG. 10A shows a screen 5502 placed vertically at the 12 o'clock position shown in FIG.
- the rotation axis R1 (see FIG. 1) connecting the first focal point f1 and the second focal point f2 of the scanning-side elliptical mirror 111 extends in the horizontal direction, and is screened so as to be orthogonal to the rotational axis R1.
- 5502 is arranged.
- the rotation axis R1 is a center line in the scanning direction (vertical direction).
- the light source unit 29 is disposed obliquely at a position avoiding the rotation axis R1 in the horizontal plane including the rotation axis R1. That is, the light source unit 29 shown in FIG. 10 is provided in an oblique direction from the front side of the paper to the back side, or in an oblique direction from the back side of the paper to the front side.
- the optical unit 71 may be installed so that the rotation axis R connecting the first focal point f1 and the second focal point f2 of the scanning-side elliptical mirror 111 passes through the center of the screen and is perpendicular to the screen.
- the posture of the scanning elliptical mirror 111 shown in FIG. 10A is an initial posture, and the initial posture is that the optical axis of the diffused light that has passed through the rotation axis R1 and the pinhole 110 is positioned on the same horizontal plane.
- the posture is such that the axis R1 passes through the center point of the screen.
- the scanning-side elliptical mirror 111 is rotated by a motor (not shown) with the first focal point f1 as the rotation center.
- the light source unit 29 is fixed, and the scanning-side elliptical mirror 111 is rotated about its first focal point f1 to perform vertical scanning. That is, the scanning-side elliptical mirror 111 is rotated in the direction of the arrow shown in FIG. As the scanning-side elliptical mirror 111 rotates, the position at which the light (diffused light) that has passed through the second focal point fb (pinhole 110) of the light-source-side elliptical mirror 282 strikes the scanning-side elliptical mirror 111 changes. That is, the rotation axis (FIG.
- the first elliptical mirror 111 of the scanning side elliptical mirror 111 coincides with the pinhole 110 by rotating the scanning side elliptical mirror 111 about the axis passing through the pinhole 110 and perpendicular to the paper surface). While maintaining this state, the position on the scanning elliptical mirror 111 where the light passing through the pinhole 110 hits the scanning elliptical mirror 111 is adjusted. Therefore, the means for rotating the scanning elliptical mirror 111 corresponds to an example of the adjusting means in the second optical unit of the present invention.
- the light source unit 29 matches the second focal point fb (pinhole 110) of the light source side elliptical mirror 282 with the first focal point f1 of the scanning side elliptical mirror 111 in order to adjust the position of the reflection region in the scanning side elliptical mirror 111.
- the second focal point fb can be rotated around the rotation center.
- the rotation here may be manual rotation or rotation by a motor (not shown).
- the light sources 28 in the light source unit 29 are coupled so that the mutual positional relationship does not change, and are integrated in the direction of the arrow shown in FIG. Rotate. Accordingly, the second focal points fb of the light source side elliptical mirrors 282 that are coincident with each other are not shifted.
- the light traveling direction (the direction of the optical axis of the diffused light) that has passed through the second focal point fb (pinhole 110) of the light source side elliptical mirror 282 is changed by the rotation of the light source unit 29, and the diffused light is changed to the elliptical mirror 111.
- the position (reflective area) that hits also changes. Therefore, the means for rotating the light source unit 29 corresponds to an example of the adjusting means in the first optical unit of the present invention and also corresponds to an example of the second adjusting means.
- the vertical installation angle of the optical unit 71 is first adjusted from the relationship between the screen shown in FIG. 9 and the rotation axis R1 of the scanning elliptical mirror 111.
- the light source unit 29 is rotated so that the pixel size of the image displayed on each of the upper and lower portions of the screen is uniform, and the light passes through the pinhole 110 and diffuses until reaching the scanning elliptical mirror 111. Adjust the direction of light travel.
- the screen tilt will be described in more detail.
- the light source unit 29 is rotated clockwise downward. If the direction of the rotation axis R1 (see FIG. 9) of the scanning-side elliptical mirror 111 shown in FIG. 10B is the 12 o'clock position, the light source unit 29 is rotated from 1 o'clock to 4 o'clock, and the pixel The light source unit 29 is fixed at a position where the size of the light source becomes uniform.
- the light source unit 29 is rotated upward in the counterclockwise direction. That is, the light source unit 29 is rotated in the direction from 8 o'clock to 11 o'clock, and similarly, the light source unit 29 is fixed at a position where the pixel sizes are uniform. Further, when the screen is on the outer side farther from the optical unit 71 than the reference perfect circle C1, the adjustment opposite to that on the inner side may be performed.
- the light source unit 29 is adjusted so that the pixel size of the image displayed on the screen is uniform.
- the light source unit 29 that has been adjusted is fixed to a frame or the like, and the relative direction (posture) of the light source unit 29 with respect to the scanning-side elliptical mirror 111 is determined.
- the scanning-side elliptical mirror 111 is rotated about the first focal point f1 as the center of rotation, thereby performing vertical scanning. That is, the scanning-side elliptical mirror 111 is rotated around the first focal point f1 of the light source unit 29 whose orientation (posture) is fixed. In this way, after adjusting to the desired irradiation area, the direction of the emitted light (reflected light) can be changed without changing the irradiation area.
- the light that has passed through the pinhole 110 always hits a predetermined position of the scanning elliptical mirror 111.
- the light source unit 29 is fixed not to the frame but to the scanning elliptical mirror 111 by a predetermined fixing member (not shown), and both are rotated while maintaining the positional relationship between the two. That is, the orientation (posture) of the light source unit 29 with respect to the scanning-side elliptical mirror 111 is maintained. As a result, the light that has passed through the pinhole 110 always hits a predetermined position of the scanning elliptical mirror 111.
- the scanning side elliptical mirror 111 is rotated together with the light source unit 29 around the first focal point f1 to perform vertical scanning.
- the combination of the predetermined fixing member and the means for rotating the scanning elliptical mirror 111 together with the light source unit 29 corresponds to an example of the direction changing means in the present invention. Furthermore, when it is difficult to rotate the light source unit 29 at a high speed when rotating both the scanning-side elliptical mirror 111 and the light source unit 29, the plane mirror 400 shown in FIG. 3 may be used.
- FIG. 11 shows the second focal point fb of the light source side elliptical mirror 282 that coincides with the first focal point f1 of the scanning side elliptical mirror 111 and rotates about the second focal point fb. It is a top view which shows the example which provided the plane mirror 400 to perform.
- FIG. 11 schematically shows the projector 65 in which the optical unit 75 is incorporated as viewed from directly above.
- the plane mirror 400 is rotated about the axis R3 so that the size of the pixels is uniform above and below the screen 55, and the orientation of the plane mirror 400 with respect to the elliptical mirror 111 is determined. Adjust.
- the scanning side elliptical mirror 111 is rotated about the axis R3 passing through the first focal point f1 as a rotation center to perform vertical scanning and pass through the pinhole 110.
- the flat mirror 400 is also rotated about the axis R3 from the position where the adjustment has been completed, following the scanning-side elliptical mirror so that the light hits the same position on the scanning-side elliptical mirror 111.
- the scanning elliptical mirror 111 and the plane mirror 400 are rotated by a motor (not shown).
- This motor is common, and the plane mirror 400 is rotated at a rotation speed (angular speed) that is 1 ⁇ 2 of the rotation speed (angular speed) of the scanning-side elliptical mirror 111 according to the gear ratio.
- the plane mirror 400 and the motor correspond to an example of the direction changing means referred to in the present invention.
- a motor for rotating the scanning-side elliptical mirror 111 and a motor for rotating the plane mirror 400 are provided separately, and both motors are electrically controlled so that the angular velocity of the motor for rotating the scanning-side elliptical mirror 111 is 1 You may make it rotate the motor which rotates the plane mirror 400 with the angular velocity of / 2. That is, the scanning-side elliptical mirror 111 and the plane mirror 400 rotate with a speed difference.
- FIG. 11 also shows a polygon mirror 651 as an example of a horizontal scanning optical member between the reflection area of the scanning side elliptical mirror 111 and the second focal point f2 of the elliptical mirror 111.
- the light reflected by the reflection area of the scanning-side elliptical mirror 111 is scanned in the horizontal direction by the polygon mirror 651.
- the light scanned by the polygon mirror 651 is applied to the screen 55.
- the number of reflections may be reduced by omitting the polygon mirror 651 and performing scanning in the horizontal direction by the scanning-side elliptical mirror 111, but the shape of the image projected on the screen using the polygon mirror is Close to a rectangle.
- the projector 65 shown in FIG. 11 does not require a large driving mechanism, and scans in the vertical direction with the scanning-side elliptical mirror 111 and scans in the horizontal direction with the polygon mirror 651, and above and below the screen 55. An image having a uniform pixel size is displayed on the screen 55.
- the projector 65 shown in FIG. 11 described above scans the light corresponding to the pixels in the vertical direction based on the image data representing the image composed of a plurality of pixels arranged in the horizontal direction and the vertical direction.
- an ellipse is rotated around a light source unit, a predetermined point where light derived from the light emitted from the light source unit converges, and a predetermined first rotation axis. It is composed of part or all of the inner peripheral surface of the ellipsoid that is sometimes formed, and has a scanning side first focal point and a scanning side second focal point on the first rotation axis, and the scanning side first focal point is at the predetermined point.
- the scanning-side elliptical mirror that reflects the light that passes through the predetermined point coincides with the scanning-side elliptical mirror that is provided at the predetermined point and rotates around the position of the predetermined point.
- Key Possible reflection member that reflects the light focused on the predetermined point a horizontal scanning mechanism that horizontally scans light corresponding to the pixel based on the image data, and the scanning-side elliptical mirror
- a vertical scanning rotation mechanism that rotates in the vertical direction with one focal point as a rotation center, and light that has passed through the predetermined point rotates with the reflection member as a rotation center.
- a projector comprising: the scanning elliptical mirror that rotates so as to hit the same position on the scanning elliptical mirror; and a follow-up rotating mechanism that rotates with a predetermined speed difference. You can say that.
- the horizontal scanning mechanism may be a mechanism that rotates the scanning-side elliptical mirror in the horizontal direction about the scanning-side first focus as the rotation center. It may be a horizontal scanning optical member provided between the position on the side elliptical mirror and the scanning side second focal point of the scanning side elliptical mirror.
- the light source unit is constituted by a part or all of the inner peripheral surface of an ellipsoid formed when the ellipse is rotated around a predetermined second rotation axis, and the light source side first on the second rotation axis.
- a light source side elliptical mirror having a focal point and a light source side second focal point; and a light source arranged at the position of the light source side first focal point to emit light toward the light source side elliptical mirror,
- the second side focal point may be disposed so as to coincide with the scanning side first focal point.
- the reflecting member may be a plane mirror
- the horizontal scanning optical member may be a polygon mirror
- the vertical scanning rotation mechanism rotates the scanning-side elliptical mirror at a predetermined angular velocity
- the follow-up rotation mechanism rotates the reflecting member at an angular velocity that is 1 ⁇ 2 of the predetermined angular velocity. It may be the one that rotates.
- Each of the optical units 11, 31, and 41 described with reference to FIGS. 1 to 3 outputs parallel light
- the light source units 51, 61, and 71 described with reference to FIGS. Has output focused light, but any optical unit outputs well-ordered light.
- the term “aligned light” as used herein means parallel light or focused light whose cross-sectional shape is not changed even when the distance from the optical unit is different.
- the cross-sectional shape becomes indefinite depending on the distance from the optical unit.
- the cross-sectional shape of the light beam (output light) changes.
- the above-mentioned “the cross-sectional shape does not change” means that the cross-sectional shape is the same regardless of where it is cut by changing the distance from the optical unit while the irradiation area (cross-sectional area) is not changed (while the irradiation area is constant). Means that. However, if the irradiation area (cross-sectional area) is changed, even if the cross-sectional shape of the light beam (output light) changes, the cross-sectional shape is often almost circular, so that this is not a problem in practice.
- the optical unit 81 shown in FIG. 12 has an optical member 810 disposed between the elliptical mirror 111 and the second focal point f2 of the optical unit 51 shown in FIG. In FIG. 12, the screen is not shown.
- the optical member 810 is a convex lens and is in contact with the second focal point f2 between the first focal point f1 and the second focal point f2, avoiding the optical path of the diffused light that passes through the pinhole 110 and travels toward the elliptical mirror 111. It is separable. That is, the optical member 810 shown in FIG. 12 can be moved in the left-right direction in the figure. In FIG. 12, the optical member 810 moved to the right side is indicated by a two-dot chain line.
- the optical member 810 can focus the light reflected by the elliptical mirror 111 that is originally focused on the second focal point f2 before the second focal point f2. As described above, the optical member 810 is provided between the first focal point f1 and the second focal point f2, and the optical member 810 is moved between them, thereby reducing the size of the pixel of the image displayed on the fixedly installed screen. Can be changed.
- the optical member 810 is not limited to a convex lens, and may be a refractive member such as a concave lens.
- a concave lens whose focal length is adjusted is used as the optical member 810, the light reflected by the elliptical mirror 111 can be focused farther than the second focal point f2.
- the optical path correction member In the light source units 21 and 29 described so far, the light is converged on the pinhole 110 by the light condensing member 212 or the light source side elliptical mirror 282, but actually light that cannot be focused on the pinhole 110 is generated.
- the optical path correction member described here corrects the path of light passing through the pinhole, like light passing through a sufficiently small pinhole.
- FIG. 13 is a front view of the optical path correction member
- FIG. 14 is a cross-sectional view taken along the line A-A ′ of the optical path correction member shown in FIG.
- the optical path correction member 91 shown in FIGS. 13 and 14 is disposed between the pinhole 110 of the optical unit described so far and the elliptical mirror 111 of the optical unit.
- the optical path correction member 91 shown in FIGS. 13 and 14 includes an inner reflecting mirror 911, an outer reflecting mirror 912, a central lens 913, and an outer peripheral lens 914.
- the inner reflecting mirror 911 has an entrance 911a and an exit 911b. In FIG. 13, the exit port 911b is in front of the page. As shown in FIG. 14, the entrance 911 a is provided at the position of the pinhole 110.
- the first focal point f1 of the elliptical mirror 111 is located between the entrance 911a and the exit 911b.
- the inner reflecting mirror 911 gradually increases in diameter from the entrance 911a toward the exit 911b, the inner peripheral surface 9111 reflects the light incident from the entrance 911a, and the outer peripheral surface 9112 also reflects the light. .
- the outer reflecting mirror 912 has an entrance side opening 912a and an exit side opening 912b.
- the exit side opening 912b is in front of the page.
- the inner peripheral surface 9121 of the outer reflecting mirror 912 is disposed so as to surround the outer peripheral surface 9112 with a space from the outer peripheral surface 9112 of the inner reflecting mirror 911.
- the inner peripheral surface 9121 gradually increases in diameter from the incident side opening 912a toward the emission side opening 912b, and reflects light.
- the incident side opening 912a is an annular opening located between the inner peripheral surface 9121 and the incident port 911a in the inner reflecting mirror 911.
- the exit side opening 912b is an annular opening located between the inner peripheral surface 9121 and the exit port 911b in the inner reflecting mirror 911.
- the central lens 913 is a concave lens that covers the exit port 911b of the inner reflecting mirror 911.
- the outer lens 914 is a concave lens that covers the emission side opening 912b of the outer reflecting mirror 912, and has a shorter focal length than the central lens 913.
- the outer peripheral lens 914 can obtain a certain effect even if it has a simple shape obtained by simply cutting out only the outer edge of a normal lens.
- FIG. It is more desirable to use a shampoo hat shape (bottom shape) with an inclination toward the front. That is, as shown in FIG. 14, the outer peripheral lens 914 is a lens that is inclined so as to move away from the incident side opening 912a as it goes outward.
- the pinhole 110 shown in FIG. 14 is viewed as one point whose area is as close as possible to 0, even if an attempt is made to focus the diffused light emitted from the light sources 211, 281R, 281G, and 281B to the one point, in practice, a certain area is required.
- the light can be focused only on the region having In FIG. 14, the region is shown as an “actual focusing region”, and the second pinhole 110 ′ and the third pinhole 110 ′′ that are included in the region and whose area is almost zero are also shown. ing. Further, the region including the first focal point f1 of the elliptical mirror 111 is shown as an “apparent focusing region”.
- the concave lens which is the central lens 913, has a function of expanding the light.
- the central lens 913 By the action of the central lens 913, the light passing through the pinhole 110 shown in FIG. Head to mirror 111.
- the size of the focusing region appears as if it is an “apparent focusing region” that is smaller than the “actual focusing region”.
- the converging region becomes this “apparent converging region”, and the diffused light emitted from the light sources 211, 281R, 281G, 281B is converged to a point close to zero as much as possible (
- the first focal point f1 of the elliptical mirror 111 is made to coincide with the ideal focusing point. That is, in reality, light that has passed through a converging region having a large area appears to have passed through a region having a small area such as an “apparent converging region” when viewed from the elliptical mirror 111, and thus the optical path shown in FIG.
- the “apparent convergence region” can be reduced.
- the light passing through the second pinhole 110 ′ and the third pinhole 110 ′′ shown in FIG. 14 is light that does not fit in the “apparent focusing region” as it is.
- the path of these lights is corrected by the outer peripheral lens 914.
- the outer peripheral lens 914 has its focal length adjusted by selecting the thickness of the lens, and the light refracted through the second pinhole 110 ′ and the third pinhole 110 ′′ is an elliptical mirror. When viewed from 111, the way the light travels is changed as if the light came from the first focal point f1 of the elliptical mirror 111.
- the focusing point of the light inside the “actual focusing area” (light passing through the entrance 911a) and the light outside the “actual focusing area” (incident side opening 912a are arranged).
- the focusing point of the light passing therethrough is matched.
- most of the light incident on the optical path correction member 91 is optically corrected to light traveling in the optical path range 1 to the optical path range 3.
- the elliptical mirror 111 was able to output only a part of the light passing through one point of the pinhole 110, but the inner reflection was achieved by arranging the optical path correction member 91.
- Most of the light incident from the incident port 911a of the mirror 911 and the light incident from the incident side opening 912a of the outer reflecting mirror 912 can be output as well-ordered light.
- the central lens 913 and the outer lens 914 are optimally designed with respect to the degree of refraction (refractive index and shape) according to the actual size of the focusing region, the angle at which the light is focused, and the like. Either 913 or the outer peripheral lens 914 may be omitted. If the lens is omitted, it is equivalent to having a lens with an infinite focal length. Further, the central lens 913 and the outer lens 914 may be convex lenses.
- a parallel light output unit (11) comprising a changing means (113) for changing either one of the focusing point (f3) and the predetermined point (f2) in a matched state.
- a rotation mechanism 513 for rotating the elliptical mirror 111 shown in FIG. 4 may be applied to the optical unit 11 shown in FIG. That is, A light collecting member (111) for focusing light derived from light emitted from the light source (211) to the predetermined point (f2); The parallel light output according to claim 1, wherein the changing means (113) is a moving mechanism (513) for rotating the light collecting member (111) about the predetermined point (f2). unit.
- the optical path correction member 91 shown in FIGS. 13 and 14 may be disposed between the second focal point f2 of the elliptical mirror 111 and the parabolic mirror 112. That is, An optical path correction member (91) is provided between the predetermined point (f2) and the optical member (112), The optical path correction member (91) is The diameter gradually increases from the entrance (911a) provided at the position of the predetermined point (f2) toward the exit (911b), and the inner peripheral surface (9111) reflects light incident from the entrance (911a).
- the outer peripheral surface (9112) also reflects light
- An inner peripheral surface (9121) that reflects light is disposed so as to surround the outer peripheral surface (9112) at a distance from the outer peripheral surface (9112) of the inner reflecting mirror (911), and the inner peripheral surface (9121).
- the incident side opening (912a) located between the incident port (911a) of the inner reflection mirror (911), and the emission port (911b) of the inner peripheral surface (9121) and the inner reflection mirror (911).
- the parallel light output unit according to appendix 1, further comprising a lens (913, 914) that acts on the light so as to be different.
- a first focal point and a second focal point are formed on a part or all of an inner peripheral surface of an ellipsoid formed when an ellipse is rotated around a predetermined rotational axis, and the first focal point has the first focal point and the second focal point on the rotational axis.
- An elliptical mirror that matches the predetermined point and reflects light that has passed through the predetermined point;
- Adjusting means capable of adjusting a position on the elliptical mirror where the light passing through the predetermined point hits the elliptical mirror while keeping the first focal point coincident with the predetermined point;
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Abstract
Description
所定の回転軸を中心にして楕円を回転させたときにできる楕円体の内周面の一部又は全部によって構成されその回転軸上に第1焦点および第2焦点を有し、その第1焦点が上記所定点に一致し、その所定点を通過してきた光を反射する楕円鏡と、
上記第1焦点が上記所定点に一致した状態を保ったまま、上記所定点を通過してきた光が上記楕円鏡に当たるその楕円鏡上の位置を調整可能な調整手段とを備えたことを特徴とする。
所定の回転軸を中心にして楕円を回転させたときにできる楕円体の内周面の一部又は全部によって構成され該回転軸上に第1焦点および第2焦点を有し、該第1焦点が前記所定点に一致し、該所定点を通過してきた光を反射する楕円鏡と、
前記第1焦点が前記所定点に一致した状態を保ったまま、前記所定点を通過してきた光が前記楕円鏡に当たる該楕円鏡上の位置を調整可能な調整手段とを備え、
前記調整手段が、前記所定点を通過して前記楕円鏡に到達するまでの拡散光の光軸に該所定点で交わる回動軸を回動中心にして前記楕円鏡を回動させるものであることを特徴とする。
整った光として取り出すことが可能である。さらに、上記調整手段によって、照射面積を変えて光を出力することができる。
上記楕円鏡で反射された光の照射を受けるスクリーンを備え、
上記楕円鏡は、上記回転軸および上記所定点を通過してきた拡散光の光軸が同一水平面上に位置しその回転軸が上記スクリーンの中心点を通るように配置された姿勢を初期姿勢とするものであってもよい。
上記光路補正部材が、
上記所定点の位置に設けられた入射口から出射口に向けて漸次拡径し、内周面がその入射口から入射した光を反射するともに外周面も光を反射し、その入射口とその出射口の間に上記楕円鏡の焦点が位置した内側反射鏡と、
光を反射する内周面が上記内側反射鏡の外周面とは間隔をあけてその外周面を取り囲むように配置され、その内周面とその内側反射鏡における入射口との間に位置する入射側開口、およびその内周面とその内側反射鏡における出射口との間に位置する出射側開口を有し、その内周面がその入射側開口からその出射側開口に向けて漸次拡径した外側反射鏡と、
上記入射口および上記入射側開口から入射した光が、上記楕円鏡から見て、その入射口および上記出射口の間に集束していることになるようにその光に作用するレンズとを備えた態様であってもよい。
上記スクリーンは、上記調整手段によって回動する楕円鏡の上記第2焦点の位置を基準に配置されたものであってもよく、
さらには、上記所定点を通過して上記楕円鏡に到達するまでの拡散光の進む方向および該拡散光の拡がる角度のうち少なくともいずれか一方を上記第1焦点を上記所定点に一致させた状態で変更する第2の調整手段を備えた態様であることが好ましい。
の位置に照射される光は、楕円鏡で反射された光ではなく、ピンホール110を通過したままの拡散光Dである。以下、同様にして○時の位置と称することがある。
光源(211)から発せられた光に由来する平行光(L14,L24,L34)を出力する平行光出力ユニット(11)において、
前記光源(211)から発せられた光に由来する光(L12,L22,L32)が集束する所定点(f2)と、
入射した平行光が反射あるいは屈折して集束する集束点(f3)が前記所定点(f2)に一致し、該所定点(f2)を通過してきた光を反射あるいは屈折させて平行光を生成する光学部材(112)と、
前記所定点(f2)を通過して前記光学部材(112)に到達するまでの拡散光(L13,L23,L33)の進む方向および該拡散光(L13,L23,L33)の拡がる角度のうち少なくともいずれか一方を前記集束点(f3)と前記所定点(f2)を一致させた状態で変更する変更手段(113)とを有することを特徴とする平行光出力ユニット(11)。
また、図1に示す光学ユニット11に、図4に示す楕円鏡111を回動する回動機構513を適用してもよい。すなわち、
前記光源(211)から発せられた光に由来する光を前記所定点(f2)に集束する集光部材(111)を備え、
前記変更手段(113)が、前記集光部材(111)を前記所定点(f2)を回動中心にして回動させる移動機構(513)であることを特徴とする付記1記載の平行光出力ユニット。
さらに、図13及び図14に示す光路補正部材91を、楕円鏡111の第2焦点f2と放物面鏡112との間に配置してもよい。すなわち、
前記所定点(f2)と前記光学部材(112)との間に光路補正部材(91)を有するものであり、
前記光路補正部材(91)が、
前記所定点(f2)の位置に設けられた入射口(911a)から出射口(911b)に向けて漸次拡径し、内周面(9111)が該入射口(911a)から入射した光を反射するともに外周面(9112)も光を反射し、該入射口(911a)と該出射口(911b)の間に前記光学部材(112)の焦点が位置した内側反射鏡(911)と、
光を反射する内周面(9121)が前記内側反射鏡(911)の外周面(9112)とは間隔をあけて該外周面(9112)を取り囲むように配置され、該内周面(9121)と該内側反射鏡(911)における入射口(911a)との間に位置する入射側開口(912a)、および該内周面(9121)と該内側反射鏡(911)における出射口(911b)との間に位置する出射側開口(912b)を有し、該内周面(9121)が該入射側開口(912a)から該出射側開口(912b)に向けて漸次拡径した外側反射鏡(912)と、
前記入射口(911a)および前記入射側開口(912a)から入射した光が、前記光学部材(112)から見て、該入射口(911a)および前記出射口(911b)の間に集束していることになるように該光に作用するレンズ(913,914)とを備えたことを特徴とする付記1記載の平行光出力ユニット。
光源から発せられた光に由来する光が集束する所定点と、
所定の回転軸を中心にして楕円を回転させたときにできる楕円体の内周面の一部又は全部によって構成され該回転軸上に第1焦点および第2焦点を有し、該第1焦点が前記所定点に一致し、該所定点を通過してきた光を反射する楕円鏡と、
前記第1焦点が前記所定点に一致した状態を保ったまま、前記所定点を通過してきた光が前記楕円鏡に当たる該楕円鏡上の位置を調整可能な調整手段とを備えたことを特徴とする光学ユニット。
111 楕円鏡
f1 第1焦点
f2 第2焦点
112 放物面鏡
113,313 移動機構
513 回動機構
21,29 光源ユニット
400 平面鏡
60,65 プロジェクタ
55 スクリーン
810 光学部材
91 光路補正部材
Claims (7)
- 光源から発せられた光に由来する光が拡散し始める所定点と、
所定の回転軸を中心にして楕円を回転させたときにできる楕円体の内周面の一部又は全部によって構成され該回転軸上に第1焦点および第2焦点を有し、該第1焦点が前記所定点に一致し、該所定点を通過してきた光を反射する楕円鏡と、
前記第1焦点が前記所定点に一致した状態を保ったまま、前記所定点を通過してきた光が前記楕円鏡に当たる該楕円鏡上の位置を調整可能な調整手段とを備え、
前記調整手段が、前記所定点を通過して前記楕円鏡に到達するまでの拡散光の進む方向および該拡散光の拡がる角度のうち少なくともいずれか一方を前記第1焦点を前記所定点に一致させた状態で変更するものであることを特徴とする光学ユニット。 - 光源から発せられた光に由来する光が拡散し始める所定点と、
所定の回転軸を中心にして楕円を回転させたときにできる楕円体の内周面の一部又は全部によって構成され該回転軸上に第1焦点および第2焦点を有し、該第1焦点が前記所定点に一致し、該所定点を通過してきた光を反射する楕円鏡と、
前記第1焦点が前記所定点に一致した状態を保ったまま、前記所定点を通過してきた光が前記楕円鏡に当たる該楕円鏡上の位置を調整可能な調整手段とを備え、
前記調整手段が、前記所定点を通過して前記楕円鏡に到達するまでの拡散光の光軸に該所定点で交わる回動軸を回動中心にして前記楕円鏡を回動させるものであることを特徴とする光学ユニット。 - 入射した平行光が反射あるいは屈折して集束する集束点が前記第2焦点に一致し、該第2焦点を通過してきた光を反射あるいは屈折させて平行光を生成する光学部材を備えたことを特徴とする請求項1又は2記載の光学ユニット。
- 前記調整手段で調整された、前記所定点を通過してきた光が前記楕円鏡に当たる該楕円鏡上の位置を、同じ位置に保ったまま、前記第1焦点を回動中心にして前記楕円鏡を回動させる方向変更手段を備えたことを特徴とする請求項1から3のうちいずれか1項記載の光学ユニット。
- 前記所定点と前記楕円鏡との間に光路補正部材を有するものであり、
前記光路補正部材が、
前記所定点の位置に設けられた入射口から出射口に向けて漸次拡径し、内周面が該入射口から入射した光を反射するともに外周面も光を反射し、該入射口と該出射口の間に前記楕円鏡の焦点が位置した内側反射鏡と、
光を反射する内周面が前記内側反射鏡の外周面とは間隔をあけて該外周面を取り囲むように配置され、該内周面と該内側反射鏡における入射口との間に位置する入射側開口、および該内周面と該内側反射鏡における出射口との間に位置する出射側開口を有し、該内周面が該入射側開口から該出射側開口に向けて漸次拡径した外側反射鏡と、
前記入射口および前記入射側開口から入射した光が、前記楕円鏡から見て、該入射口および前記出射口の間に集束していることになるように該光に作用するレンズとを備えたことを特徴とする請求項1から4のうちいずれか1項記載の光学ユニット。 - 前記楕円鏡で反射された光の照射を受けるスクリーンを備え、
前記スクリーンは、前記調整手段によって回動する楕円鏡の前記第2焦点の位置を基準に配置されたものであることを特徴とする請求項2記載の光学ユニット。 - 前記所定点を通過して前記楕円鏡に到達するまでの拡散光の進む方向および該拡散光の拡がる角度のうち少なくともいずれか一方を前記第1焦点を前記所定点に一致させた状態で変更する第2の調整手段を備えたことを特徴とする請求項6記載の光学ユニット。
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JP2019120863A (ja) * | 2018-01-10 | 2019-07-22 | 株式会社ライトショー・テクノロジー | 光源装置および投射型表示装置 |
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