JP6882739B2 - Optical device and optical converter - Google Patents

Description

The present invention is an optical device including a projection lens unit that projects the emitted light emitted from the main body of the optical device excluding the optical system onto the projected surface portion to display an image, and an optical converter used in combination with the projection lens portion. Regarding.

Conventionally, a projector that projects emitted light emitted from a projector main body to a screen through a projection lens and displays an image on the screen usually supports the projection lens and supports the projection lens in the vertical and horizontal directions. It is provided with a lens shift mechanism that adjusts the position of the image displayed on the screen by shifting to, and as a lens shift mechanism of this type, the optics disclosed in Patent Document 1 already proposed by the present applicant. The lens shift device of the device is known.

This lens shift device secures the necessary and sufficient mechanical strength in the fixed support board that supports the device, realizes overall weight reduction, cost reduction, and improvement in dimensional accuracy, and the lens position and focus due to thermal expansion and contraction. The purpose is to avoid unnecessary fluctuations in the position, and as a basic configuration, the lens mounting panel on the optical device side on which the lens unit (projection lens) is mounted is movable to support it so that it can be displaced in the horizontal direction. The support board, the horizontal movement mechanism that moves the lens mounting board in the horizontal direction, the fixed support that supports the movable support board so that it can be displaced in the vertical direction, and the movable support board that moves in the vertical direction. In addition to being provided with a vertical movement mechanism portion, in particular, a base plate portion formed of a plastic material from the lens unit side, a heat insulating plate portion formed of a heat insulating material in a sheet shape, and a metal having heat transfer properties. The reinforcing plate portion formed of the material is integrally formed by a three-layer hybrid structure in which the reinforcing plates are sequentially stacked.

Japanese Unexamined Patent Publication No. 2012-255911

However, the lens shift device of the conventional optical device described above also has the following problems to be solved.

That is, this type of lens shift device (lens shift mechanism) adjusts the position of the image displayed on the screen by sliding the projection lens up and down and left and right in the direction perpendicular to the optical axis direction. Since it has a function, the larger the shift range of the image, the higher (lower) the optical device can be installed with respect to the screen unit, or the more left and right positions can be installed, and the more the optical device can be installed on the screen unit. On the other hand, it is possible to improve the installability (flexibility of installation) of the optical device, such as being able to install it at a closer position.

Therefore, from the viewpoint of improving the installability of the optical device, it is desirable to increase the shift range. However, the shift range is usually limited by the characteristics of the projection lens, the size of the entire optical device, and the like. There is a limit to how much it can be expanded. In the end, there was a limit to improving the installability of optical equipment under the restrictions of projection lenses and optical equipment.

An object of the present invention is to provide an optical device and an optical converter that solve the problems existing in such a background technique.

In order to solve the above-mentioned problems, the optical device P according to the present invention projects an image by projecting the optical device main body 2 excluding the optical system and the emitted light emitted from the optical device main body 2 onto the projected surface portion 4. When constructing an optical device including an optical system having a projection lens unit 3 for displaying, the actual arrangement of the display panel unit Ppp which is arranged in front of the optical device main body 2 in the optical direction Fc and built in the optical device main body 2 is arranged. With respect to the installation position Xs, the actual position Xv of the display panel unit Ppp is shifted forward in the optical direction Fc, and the image displayed by the light emitted from the display panel unit Ppp at the actual arrangement position Xs is displayed. A relay lens unit 6 that reduces the image displayed by the light emitted from the display panel unit Ppp at the substantial position Xv by an arbitrary magnification, and a plurality of reflecting surfaces arranged in front of the optical traveling direction Fc of the relay lens unit 6 Image angle conversion that converts the image Vs at a predetermined angle related to the emitted light emitted from the relay lens unit 6 into the image Vt rotated around the optical axis by the combination of 8 am, 8 bm, and 8 cm. A lens shift mechanism unit 7 that is arranged in front of the Fc in the optical direction of the image angle conversion unit 8 and the unit 8 and supports the projection lens unit 3 to displace the projection lens unit 3 in the vertical direction Fv and / or the horizontal direction Fh. It is characterized by comprising an optical system 5 having the above.

On the other hand, in order to solve the above-mentioned problems, the optical converter 1 according to the present invention is attached to and detached from the optical device main body 2 excluding the optical system, and the emitted light emitted from the optical device main body 2 is emitted from the projected surface portion. An optical converter that constitutes a predetermined optical system by being combined with a projection lens unit 3 that projects onto 4 and displays an image, and is arranged in front of the optical device main unit 2 in the optical direction Fc and is arranged in front of the optical device main unit 2. The actual position Xv of the display panel unit Ppp is changed to the front of the optical line Fc with respect to the actual arrangement position Xs of the display panel unit Ppp built in 2, and the display panel unit Ppp at the actual arrangement position Xs is used. The relay lens unit 6 for reducing the image displayed by the emitted light Cs from the display panel unit Ppp at the substantially position Xv with respect to the image displayed by the emitted light Co, and the relay lens unit 6 of the relay lens unit 6. By arranging it in front of the Fc in the light-advancing direction and combining a plurality of reflecting surfaces 8am, 8bm, and 8 cm, the image Vs at a predetermined angle related to the emitted light emitted from the relay lens unit 6 is centered on the optical axis. The image angle conversion unit 8 that converts the image Vt into the rotated image Vt and the image angle conversion unit 8 are arranged in front of the optical direction Fc of the image angle conversion unit 8 to support the projection lens unit 3 and support the projection lens unit 3 in the vertical direction Fv and /. Alternatively, it is characterized by including an optical system 5 having a lens shift mechanism portion 7 that is displaced in the lateral direction Fh.

Further, according to a preferred embodiment, the present invention can be configured by a prism unit 8u in which a plurality of prism members 8a, 8b, 8c are combined with a plurality of reflecting surfaces 8am, 8bm, 8cm in the image angle conversion unit 8. The prism unit 8u can be composed of three prism members 8a, 8b, 8c arranged along the optical path. In addition, the image angle conversion unit 8 may be provided with a back focus adjustment mechanism unit 12 capable of adjusting the back focus on the optical device main body 2 on the emission side. The lens shift mechanism unit 7 may be integrally provided with a projection lens unit 3 on the exit side.

According to the optical device P and the optical converter 1 according to the present invention having such a configuration, the following remarkable effects are obtained.

(1) A relay lens unit 6 that shifts the actual position Xv of the display panel unit Ppp to the front of the light-advancing Fc with respect to the actual arrangement position Xs of the display panel unit Ppp built in the optical device main body 2. An optical system 5 having a lens shift mechanism unit 7 that supports a projection lens unit 3 arranged in front of the light advance direction Fc of the relay lens unit 6 and displaces the projection lens unit 3 in the vertical direction Fv and / or the horizontal direction Fh. Therefore, it is possible to shift the substantial position Xv of the display panel unit Ppp to the front of the optical device main body 2, particularly to the outside of the optical device main body 2, and when combined with the lens shift mechanism unit 7. Even if there is, it is possible to easily and flexibly respond to the selection of the arrangement position of the lens shift mechanism 7 or the selection of the shift range (shift rate) without increasing the size of the lens shift mechanism 7. it can.

(2) The optical converter 1 is a projection lens that is attached to and detached from the optical device main body 2 excluding the optical system, and projects the emitted light emitted from the optical device main body 2 onto the projected surface portion 4 to display an image. Since the predetermined optical system 5 is configured by combining with the unit 3, the optical converter 1 can be configured as an independent unit. Therefore, it is excellent in versatility and expandability, for example, it can be retrofitted to an optical device P such as an existing projector provided with an interchangeable projection lens unit 3.

(3) The relay lens unit 6 is displayed by the emitted light Cs from the display panel unit at the substantial position Xv with respect to the image displayed by the emitted light Co from the display panel unit Ppp at the actual arrangement position Xs. Since the image is reduced by an arbitrary magnification, the shift range (shift rate) of the image (screen) projected on the projected surface portion 4 can be easily enlarged without changing the lens shift mechanism portion 7. As a result, the optical device P such as a projector can be installed at a higher (lower) height with respect to the projected surface portion 4, or can be installed at a position farther from the left and right, and with respect to the projected surface portion 4. The installability (installation flexibility) of the optical device P can be dramatically improved, such as being able to be installed at a closer position.

(4) Since the optical system 5 is provided with an image angle conversion unit 8 that converts an image Vs at a predetermined angle related to the emitted light emitted from the relay lens unit 6 into an image Vt rotated around the optical axis. Even when the video camera is laid down for portrait photography, for example, the image taken by the video camera can be displayed as it is while the projector (optical device P) is in the general horizontal position, and the image quality is high. Can be avoided. Moreover, in this case, even when the projector is installed in a ceiling-mounted manner with respect to the ceiling at a high position, the projector can be installed at the position closest to the ceiling.

(5) Since the image angle conversion unit 8 is configured by combining a plurality of reflecting surfaces 8am, 8bm, and 8 cm, it can be configured by combining a plurality of prism members 8a, 8b, 8c and a plurality of mirror members. It can be used as an image angle conversion unit 8 having excellent versatility and expandability without being limited to parts.

(6) According to a preferred embodiment, if the image angle conversion unit 8 is composed of a prism unit 8u in which a plurality of prism members 8a, 8b, 8c are combined, the target image angle conversion unit 8 can be easily obtained. At the same time, it is possible to configure a stable image angle conversion unit 8 with high accuracy.

(7) According to a preferred embodiment, if the prism unit 8u is composed of three prism members 8a, 8b, 8c arranged along the optical path, from the viewpoints of low cost, light weight, compactness, compactness, translucency, and the like. Since the most advantageous configuration can be obtained from the above, it can be carried out as the most desirable embodiment in carrying out the present invention.

(8) According to a preferred embodiment, if the image angle conversion unit 8 is provided with a back focus adjustment mechanism unit 12 capable of adjusting the back focus with respect to the optical device main body 2 on the emission side, various optical devices having different back focus are provided. Since the back focus of the main body 2 can be easily adjusted on the optical converter 1 side, it can be constructed as a highly versatile optical converter 1, and the accuracy of the mounted optical device main body 2 is high. The optimum back focus can be set.

(9) According to a preferred embodiment, when the lens shift mechanism unit 7 is configured, if the projection lens unit 3 is integrally provided on the exit side, the projection lens unit 3 can be used as a dedicated projection lens for the optical converter 1. Since the design becomes possible, the optical converter 1 can be optimized, for example, the projection lens unit 3 can be constructed as an optimum optical converter 1 that matches the relay lens unit 6 and the lens shift mechanism unit 7, and the like. ..

An external plan view showing a state in which the optical converter according to the preferred embodiment of the present invention is mounted on a projector which is an optical device. External plan view of the optical converter, Front view showing a part of the projector equipped with the optical converter, External perspective view of the optical converter, Lens data table of the relay lens part provided in the optical converter, Side sectional view showing the upper half of the back focus adjustment mechanism provided in the optical converter, A perspective view of the image angle converter provided in the optical converter, Functional explanatory diagram of the image angle converter provided in the optical converter, External perspective view showing an example of a projector to which the optical converter can be mounted, A block configuration diagram showing an example of the optical system and signal system of a projector to which the optical converter can be mounted. Schematic configuration diagram showing an example of the internal optical system of a projector to which the optical converter can be mounted, A flowchart showing the functions of each part of the optical converter step by step, Schematic diagram showing an installation example in which a projector equipped with the same optical converter is installed in a ceiling-mounted manner, Functional explanatory diagram of the lens shift mechanism equipped with the same optical converter, Functional explanatory diagram of the lens shift mechanism that does not have the same optical converter, Schematic block diagram for explaining the operation of the optical system including the optical converter, A flowchart showing the functions of each part of the optical converter according to the modified embodiment of the present invention in order.

1: Optical converter, 2: Optical device main body, 3: Projection lens, 4: Projected surface, 5: Optical system, 6: Relay lens, 7: Lens shift mechanism, 8: Image angle conversion, 8a: Prism member, 8b: Prism member, 8c: Prism member, 8u: Prism unit, 12: Back focus adjustment mechanism, P: Optical device, Ppp: Display panel, Xs: Actual placement position, Xv: Substantial Target position, Fc: optical direction, Fv: vertical direction, Fh: horizontal direction, Co: emitted light, Cs: emitted light, Vs: image, Vt: image

Next, the optimum embodiment according to the present invention will be described and described in detail with reference to the drawings.

First, in order to facilitate the understanding of the optical converter 1 according to the present invention, an outline of the optical device P in which the optical converter 1 can be used will be described with reference to FIGS. 2, 9 to 11. In the embodiment, a general-purpose projector Pp is shown as an example of the optical device P.

As shown in FIG. 9, the projector Pp includes a projector main body 2p that constitutes the optical device main body 2. The illustrated projector main body 2p is covered with a rectangular parallelepiped cabinet 21 having a relatively low height, and the front plate 21f of the cabinet 21 has a lens mounting opening 21h. Reference numeral 3 denotes an interchangeable lens type projection lens unit, and as shown in FIG. 2, a mount portion 3 m provided at the rear end of the projection lens unit 3 is inserted into the cabinet 21 from the lens mounting opening 21h. It is attached to the mount portion 2m (FIG. 2) on the 2p side of the projector main body portion. The above is the appearance configuration of the entire projector Pp. In FIGS. 2 and 9, Ppp indicated by a dotted line indicates a display panel portion such as a liquid crystal panel built in the projector main body portion 2p, and a predetermined arrangement position in which an appropriate back focus is ensured with respect to the projection lens portion 3. It is mounted in a fixed state on Xs.

On the other hand, FIG. 10 shows a block configuration of an optical system and a signal system in the projector main body 2p. In FIG. 10, 21 indicates the above-mentioned cabinet, 3 indicates the above-mentioned projection lens portion, and Ppp indicates the above-mentioned display panel portion. The projector main body 2p includes an illumination optical unit 31 including a display panel unit Ppp arranged on the upstream side in the optical direction with respect to the projection lens unit 3, and a light source unit 32 is arranged at an upstream source of the illumination optical unit 31. .. The light source unit 32 to the projection lens unit 3 form an optical system in the projector main body unit 2p. Reference numeral 33 denotes a panel drive unit connected to the display panel unit Ppp, and 34 indicates a power supply unit for supplying electric power to each necessary unit including the light source unit 32.

FIG. 11 shows a configuration example of the optical system in the projector main body 2p. The optical system illustrated in FIG. 11 includes an illumination optical system 51, a color separation optical system 52, and a relay optical system 53, as well as two condenser lenses 54, 55, three liquid crystal panels 56, 57, 58, and color synthesis. It includes a prism 59 and a projection lens 3. In this case, the illumination optical system 51 includes a light source unit 32 in which the white lamp 32o is housed in the reflector 32r, and the first array lens 61, the second array lens 62, and polarized light are located downstream of the light source unit 32 in the light advancing direction. The conversion element 63 and the condenser lens 64 are sequentially arranged and configured. Further, the color separation optical system 52 is arranged on the downstream side of the condenser lens 64 to reflect R light, and G light and B light are transmitted through the dichroic mirror 65, and the reflected light (R light) of the dichroic mirror 65. The reflection mirror 66 is provided, and the R light reflected by the reflection mirror 66 is transmitted through the condenser lens 55. Further, the color separation optical system 52 includes a dichroic mirror 67 that anti-obliques G light which is transmitted light of the dichroic mirror 65 and transmits B light, and the reflected light (G light) of the dichroic mirror 67 is a condenser lens. It is transparent to 54. On the other hand, in the relay optical system 53, the first relay lens 68 through which the B light, which is the transmitted light of the dichroic mirror 65, is transmitted, and the B light transmitted through the first relay lens 68, which are arranged on the downstream side of the dicroic mirror 65, are transmitted. A reflective mirror 69 that reflects, a second relay lens 70 that transmits B light reflected by the reflective mirror 69, a reflective mirror 71 that reflects B light transmitted through the second relay lens 70, and B light reflected by this reflective mirror 71. A third relay lens 72 through which light is transmitted is sequentially arranged and configured.

Further, the R light transmitted through the condenser lens 55 enters the R light input surface of the color synthesis prism 59 through the R light liquid crystal panel 56, and the G light transmitted through the condenser lens 54 enters the G light liquid crystal panel. The B light that enters the G light input surface of the color synthesis prism 59 through 57 and further passes through the third relay lens 72 enters the B light input surface of the color synthesis prism 59 through the B light liquid crystal panel 58. It glows. Then, the R light, the G light, and the B light are combined by the color synthesis prism 59 and enter the projection lens unit 3 from the emission surface of the color synthesis prism 59. Therefore, the three liquid crystal panels of the R light liquid crystal panel 56, the G light liquid crystal panel 57, and the B light liquid crystal panel 58 constitute the display panel portion Ppp. The optical system illustrated above constitutes a known general projector element. In FIG. 11, the optical system excluding the light source unit 32 and the projection lens unit 3 constitutes the above-mentioned illumination optical unit 31. Further, in FIG. 11, reference numeral 4 denotes a projected surface portion using a flat screen.

Further, as shown in FIG. 10, the projector main body 2p includes a cooling unit (cooling fan or the like) 35 for cooling the inside of the cabinet 21 including the light source unit 33, and a video signal input / output unit including an input unit and an output unit for video signals. 36, an audio signal input / output unit 37 having an input unit and an output unit for an audio signal, a communication unit 38 that exchanges communication with the outside, a control unit 39 that includes a CPU and performs various control processes, a non-volatile memory, a RAM, and the like. It includes an internal memory 40 including, an operation unit 41 for performing various inputs from an operation panel desired to the outside, an image adjustment unit 42 capable of performing various adjustments related to images, a storage unit 43, and the like, and these are bus lines. , A known general projector element is configured by connecting via various connection lines 44 including a signal line, a power supply line, and the like.

Next, the configuration of the optical converter 1 according to the present embodiment will be specifically described with reference to FIGS. 1 to 8.

As shown in FIGS. 1 and 2, the optical converter 1 is roughly classified, and the relay lens unit 6, the image angle conversion unit 8, and the lens shift mechanism unit 7 are sequentially arranged from the rear side to the front side in front of the Fc in the photoadvancing direction. To configure. The relay lens unit 6, the image angle conversion unit 8, and the lens shift mechanism unit 7 to be exemplified are configured as separate units, and are connected by using the flange portions 6f, 8ff, 8fr, and 7f provided in the front and rear. The whole is configured as an integrated optical converter 1.

In this case, the relay lens unit 6 sets the actual position Xv of the display panel unit Ppp with respect to the actual arrangement position Xs of the display panel unit Ppp such as the liquid crystal panel built in the projector main body 2p shown in FIG. It has a function (relay function) to shift the Fc forward in the light advance direction. Further, in addition to the relay function, the illustrated relay lens unit 6 is from the display panel unit at the substantial position Xv with respect to the image displayed by the emitted light Co from the display panel unit Ppp at the actual arrangement position Xs. It has a scaling characteristic (magnification function) that reduces the image displayed by the emitted light Cs by an arbitrary magnification.

If the relay lens unit 6 is configured to have such a variable magnification characteristic, the shift range (shift rate) of the image (screen) projected on the projected surface unit 4 is accompanied by a change in the lens shift mechanism unit 7. An optical device P such as a projector can be installed at a higher (lower) height than the projected surface portion 4, or can be installed at a position farther to the left and right, and the projected surface portion 4 can be easily enlarged. On the other hand, there is an advantage that the installability (installation flexibility) of the optical device P can be dramatically improved, such as being able to be installed at a closer position.

Further, the relay lens portion 6 includes a lens barrel 6c that serves as an outer shell, and has a mounting portion 6m on the lens side that is attached to and detached from the projector main body 2p at the rear end of the lens barrel 6c, and at the front end. It has a flange portion 6f. The lens barrel 6c is configured by incorporating a lens group in which a plurality of lenses are arranged. The lens data of the illustrated relay lens unit 6 is shown in FIG. The relay lens unit 6 has a magnification of 0.5 times. In FIG. 5, nd is the refractive index and νd is the Abbe number. Further, in FIG. 5, the "object surface" in the surface number is the recombination surface.

Therefore, as shown in FIG. 1, the actual position Xv (position corresponding to the imaging point) of the display panel unit Ppp at the arrangement position Xs inside the projector main body 2p is moved to the outside of the projector Pp by the relay lens unit 6. It is possible to transfer to.

The image angle conversion unit 8 has a function of converting a horizontal image into a vertical image with the optical axis as a fulcrum. The configuration of the illustrated image angle conversion unit 8 is shown in FIGS. 1 to 2, 7 and 8. The image angle conversion unit 8 includes a housing 8h as an outer shell, and as shown in FIG. 2, the rear end of the housing 8h has a flange portion 8fr that is coupled to the flange portion 6f provided on the lens barrel 6c, and also has a flange portion 8fr. The front end has a flange portion of 8 ff. Further, the housing 8h incorporates a prism unit 8u formed by combining the three prism members 8a, 8b, 8c shown in FIG. 7. As a result, as shown in FIG. 8, the horizontal image Vs (horizontal R) that enters the prism unit 8u can be converted into the vertical image Vt (vertical R) and emitted from the prism unit 8u. In the three prism members 8a, 8b, 8c, 8am, 8bm, and 8 cm indicate the reflecting surfaces of the prism members 8a, 8b, and 8c, respectively.

In this way, if the image angle conversion unit 8 for converting the image Vs in the horizontal direction into the image Vt in the vertical direction is provided between the relay lens unit 6 and the lens shift mechanism unit 7 with the optical axis as the center of rotation, the video Even when portrait shooting is performed with the camera set to a vertical screen, the image shot by the video camera can be displayed as it is while the projector Pp is in the general horizontal position, and the problem of deterioration in image quality is avoided. it can. Further, when the image angle conversion unit 8 is configured, if the prism unit 8u is a combination of a plurality of prism members 8a, 8b, 8c, the target image angle conversion unit 8 can be easily obtained and the target image angle conversion unit 8 can be easily obtained. There is an advantage that a stable image angle conversion unit 8 with high accuracy can be configured. In particular, as shown in the example, if the prism unit 8u is composed of three prism members 8a, 8b, 8c arranged along the optical path, from the viewpoints of low cost, light weight, compactness, compactness, translucency, and the like. Since the configuration can be the most advantageous, it can be carried out as the most desirable embodiment in carrying out the present invention.

By the way, as shown in FIG. 7, the image angle conversion unit 8 constitutes the prism unit 8u by combining a plurality of prism members 8a, 8b, 8c. Therefore, the image angle conversion unit 8 has the prism members 8a ... It is also possible to provide an image angle changing function capable of changing the angle of the image Vs to an arbitrary angle by rotating all or a part of the above with the optical axis as the center of rotation. In this case, if a support structure that can rotate relative to each prism member 8a, 8b, 8c is provided without fixing the contact surface between the prism members 8a, 8b, 8c by adhesion or the like. Good. If such an image angle changing function is provided, it is possible to flexibly and flexibly respond to various installation locations of the optical device P, the form of the projected surface portion 4, and various performances on the projected image. It has the advantage of being relatively easy to implement.

On the other hand, the lens shift mechanism portion 7 is provided with a support plate 7s at the rear end, which also serves as a flange portion 7f to be coupled to the flange portion 8ff provided on the housing 8h, and an operation mechanism (drive) (not shown) is provided on the front surface of the support plate 7s. The X-direction movable board 7x that is displaced in the X direction is supported by the mechanism), and the Y-direction movable board 7y that is displaced in the Y direction by an operation mechanism (drive mechanism) (not shown) is supported on the front surface of the X-direction movable board 7x. .. A mount portion 7m to which the projection lens portion 3 is attached / detached is integrally provided on the front surface of the Y-direction movable platen 7y.

Further, as shown in FIG. 1, the back focus adjustment mechanism unit 12 capable of adjusting the back focus on the projector main body 2p is on the exit side (light entry side with respect to the lens shift mechanism unit 7) of the image angle conversion unit 8. Is provided. FIG. 6 shows the cross-sectional structure of the upper half of the back focus adjustment mechanism portion 12. The back focus adjustment mechanism unit 12 includes a first fixed cylinder portion 81 provided on the image angle conversion unit 8 side and a second fixed cylinder portion 82 provided on the lens shift mechanism portion 7 side, and the first fixed cylinder portion 81 of the first fixed cylinder portion 81. The outer peripheral surface is inserted into the inner peripheral surface of the second fixed cylinder portion 82, and a plurality of guides (for example, three at equal intervals in the circumferential direction) that are long in the front-rear direction (optical axis direction) are inserted into the second fixed cylinder portion 82. The hole 83 ... is provided, and the first fixed cylinder portion 81 is provided with a rotating roller 84 ... that is guided by engaging with the guide hole 83. As a result, the second fixed cylinder portion 82 is allowed only to be displaced in the front-rear direction (optical axis direction) with respect to the first fixed cylinder portion 81.

Further, the first fixed cylinder portion 81 and the second fixed cylinder portion 82 are provided with male screw portions 81p and 82n using helicoid screws having a large diameter, respectively, and the first fixed cylinder portion 81 and the second fixed cylinder portion 82 are provided. An adjustment ring 85 having a female threaded portion 85p and 85n formed on the inner peripheral surface using a helicoid screw straddling between the male threaded portions 81p and 82n is mounted. In this case, since the screw forming directions of the male screw portions 81p and 82n are in a forward-reverse relationship, if the adjusting ring 85 is rotated in the forward direction, the first fixed cylinder portion 81 and the second fixed cylinder portion 82 are relative to each other. If the first fixed cylinder portion 81 and the second fixed cylinder portion 82 are displaced in the direction away from each other and rotated in the opposite direction, the first fixed cylinder portion 81 and the second fixed cylinder portion 82 are displaced in the direction in which they are relatively close to each other. In this way, the back focus can be easily adjusted by operating the adjustment ring 85. In particular, by disposing the back focus adjustment mechanism unit 12 on the emission side of the image angle conversion unit 8, it is possible to correct the total distance between the emission side of the image angle conversion unit 8 and the display panel unit Ppp.

Therefore, if such a back focus adjustment mechanism unit 12 is provided, the back focus can be easily adjusted on the optical converter 1 side even for various projector main body units 2p ... With different back focus, which is versatile. In addition to being able to be constructed as a high optical converter 1, there is an advantage that an optimum back focus with high accuracy can be set for the mounted projector main body 2p.

Next, the method of use and the function of the optical converter 1 according to the present embodiment will be described with reference to FIGS. 1 to 15.

First, a method of using the optical converter 1 will be described with reference to FIGS. 1 to 4. The optical converter 1 is a general projector Pp including a projector main body 2p and a projection lens unit 3 that projects the emitted light Co emitted from the projector main body 2p onto the projected surface 4 to display an image, particularly the projector Pp. It can be used in combination with the projection lens unit 3 provided in the projector Pp.

At the time of use, first, as shown in FIG. 2, the projection lens portion 3 attached to the projector main body 2p is removed from the projector main body 2p of the projector Pp. Then, the removed mounting portion 3m of the projection lens portion 3 is attached to the mounting portion 7m at the front end of the optical converter 1 prepared in advance. FIG. 4 shows this state, and in FIG. 2, the arrow D1 shows an image of this operation. In FIGS. 1 to 3, 21 is a cabinet of the projector main body 2p, 21f is a front plate in the cabinet 21, and 21h is a lens mounting opening provided in the front plate 21f.

On the other hand, in the optical converter 1 to which the projection lens portion 3 is attached, the mount portion 6 m provided at the rear end is attached to the mount portion 2 m of the projector main body portion 2p. 1 and 3 show this state. Therefore, the optical system including the projection lens unit 3 and the optical converter 1 constitutes the entire optical system 5 in the projector Pp. In FIG. 2, arrow D2 shows an image of this operation. As a result, the already installed projector Pp can be changed to a projector Pp equipped with the optical converter 1 according to the present embodiment, and in particular, it is used as a projector Pp for projecting and displaying a portrait image. it can.

Next, the overall function of the projector Pp including the optical converter 1 will be described with reference to FIGS. 1 to 15. The overall function will be described step by step with reference to the flowchart shown in FIG. 12 for the projector Pp installed at the fashion show venue of FIG. 13 shown as an example.

In this case, as shown in FIG. 13, the projector Pp is horizontally attached to the ceiling 103 of the venue 101 via the hanging metal fittings 102, and is projected on the vertically long projected surface portion 4 on the wall surface behind the stage by a portrait image. Demonstrates the function of enlarging the display. As described above, the projector Pp provided with the optical converter 1 according to the present embodiment is installed at the position closest to the ceiling 103 even when it is installed in a ceiling-mounted manner with respect to the ceiling 103 at a high position. There are advantages that can be done. Further, it is assumed that the subject (person 104) on the stage is photographed as a vertically long image, that is, a vertically long screen by a video camera (not shown) placed 90 [°] horizontally. The projected surface portion 4 may be a case where a separate screen is installed on the wall surface, or a case where the white wall surface is used as it is as a screen.

First, a vertically long image (vertical screen) is captured by the video camera (step S1). Therefore, the image data of the subject to be a vertically long image is the horizontal orientation in which the orientation of the subject is rotated by 90 [°]. On the other hand, the image data based on the shooting is transmitted to the projector Pp and input to the input unit of the projector Pp (projector main body 2p) (step S2). As a result, the emitted light based on the image Vh in which the subject is oriented sideways is emitted from the projector main body 2p.

Further, the emitted light Co emitted from the projector main body 2p enters the relay lens 6 in the optical converter 1 according to the present embodiment and transmits the relay lens 6 (step S3). Based on the lens data shown in FIG. 5, the relay lens unit 6 shifts the substantial position Xv of the display panel unit Ppp to the front of the light-advancing Fc with respect to the actual arrangement position Xs of the display panel unit Ppp. At the same time, the image displayed by the emitted light emitted from the substantial position Xv of the display panel unit Ppp is further converted into the image displayed by the emitted light Co emitted from the display panel unit Ppp at the actual arrangement position Xs. On the other hand, it is reduced by an arbitrary magnification (0.5 times in the example).

FIG. 14 is an image showing an image Vs obtained by reducing an image based on the emitted light Co emitted from the projector main body 2p by a predetermined magnification. In this case, the orientation of the subject in the image Vs is the horizontal orientation rotated by 90 [°] as shown by the character “horizontal R” shown in FIG. Note that FIG. 15 is an image of the image Vh before reduction, that is, the image Vh when the optical converter 1 according to the present embodiment is not used, in order to compare with the image Vs after reduction.

Further, the image Vs emitted from the relay lens unit 6 enters the prism unit 8u constituting the image angle conversion unit 8. Then, by transmitting through the prism unit 8u (image angle conversion unit 8), as shown in FIG. 8, the image Vs in the horizontal direction is rotated by 90 [°] about the optical axis as a fulcrum, and the image Vt in the vertical direction is Is converted to (step S4). That is, as shown in FIG. 8, the lateral image Vs that receives light in the horizontal direction with respect to the prism member 8a is reflected by the reflecting surface 8am of the prism member 8a and is emitted upward in the direction perpendicular to the light entering direction. Then, the light enters the next prism member 8b as the image Vm1. Since the prism member 8b has a different orientation with respect to the prism member 8a, the incident light entering the prism member 8b is reflected to the right in the horizontal direction by the reflecting surface 8bm of the prism member 8b. Further, the image Vs reflected by the reflecting surface 8bm enters the next prism member 8c as the image Vm2 in the vertical direction. Since the prism member 8c has a different orientation with respect to the prism member 8b, the incident light entering the prism member 8c is reflected forward in the horizontal direction by the reflecting surface 8 cm of the prism member 8c and converted in the vertical direction. The image Vt related to "R" is emitted from the prism member 8c. In this way, the horizontal image Vs that enters the prism unit 8u is rotated by 90 [°] about the optical axis as a fulcrum by the prism unit 8u, and is converted into the vertical image Vt.

Next, the emitted light (image Vt) emitted from the prism unit 8u (image angle conversion unit 8) passes through the lens shift mechanism unit 7 (step S5). The lens shift mechanism 7 adjusts the shift with respect to the screen position for displaying the image in the X direction (horizontal direction) and the Y direction (vertical direction).

By the way, in this case, since the image Vh is reduced by the relay lens unit 6 at a predetermined magnification (0.5 times in the example), the shift range of the reduced image Vt (Vs) is greatly expanded. .. FIG. 14 shows the shift range in the case of the image (screen) Vs, and FIG. 15 shows the shift range in the case of the image (screen) Vh. Reference numeral A indicates an effective image circle. In the case of images Vs, as shown in FIG. 14, the shift range in the X direction is the range indicated by the images Vsp and Vsq, and the shift range in the Y direction is the range indicated by the images Vsu and Vsd. In the case of the image Vh, as shown in FIG. 15, the shift range in the X direction is the range indicated by the images Vhp and Vhq, and the shift range in the Y direction is the range indicated by the images Vhu and Vhd. As is clear from this, the shift range (shift rate) of the reduced image Vs can be greatly enlarged with respect to the image Vh before reduction.

On the other hand, the image Vt (light emitted from the prism unit 8u) that has passed through the lens shift mechanism unit 7 enters the projection lens unit 3 and is transmitted through the projection lens unit 3 (step S6). The image Vt transmitted through the projection lens unit 3 is projected onto the projected surface portion 4. At this time, the image Vt is adjusted by various adjustment mechanisms including a zooming adjustment mechanism and a focusing adjustment mechanism provided in the projection lens unit 3. As a result, the optimally adjusted image Vt is displayed on the projected surface portion 4.

Note that FIG. 16 shows a schematic image of the entire configuration including the optical converter 1 focusing on the optical system 5.

As shown in the figure, the horizontally long screen image V1 (the image is horizontally oriented) due to the emitted light Co emitted from the display panel unit Ppp is incident on the prism unit 8u via the relay lens unit 6 described above, and is inside the prism unit 8u. In, once an image is formed. This image formation becomes the first image plane, and the screen image V2 on the first image plane becomes vertically long and 90 [°] rotated as shown in FIG.

This screen image V2 is reduced (example: 0.5) by the scaling function of the relay lens unit 6. This reduction ratio can correspond to the vertical shift of the lens shift mechanism unit 7. The screen image V2 at this time is a screen that is upside down with respect to the final screen (screen image V3) that is enlarged and projected on the screen unit 4.

Then, the screen image V2 imaged in the prism unit 8u is magnified and projected onto the screen unit 4 which is the second imaging surface through the projection lens unit 3. The screen image magnified and projected on the screen unit 4 is V3 in FIG. 16, that is, a vertically long formal screen image V3. The number, curvature, configuration, etc. of lenses in various lens groups including the projection lens unit 3 and the relay lens unit 6 shown in FIG. 16 are schematically exemplified, and can be appropriately set according to various modes. ..

As described above, the optical converter 1 according to the present embodiment has, as a basic configuration, substantially the display panel unit Ppp with respect to the actual arrangement position Xs of the display panel unit Ppp built in the projector main body 2p. Supporting the relay lens unit 6 that shifts the position Xv to the front of the light traveling direction Fc and the projection lens unit 3 arranged in front of the light traveling direction Fc of the relay lens unit 6, the projection lens unit 3 is used in the vertical direction Fv and the horizontal direction Fh. Since the optical system 5 having the lens shift mechanism unit 7 that is displaced to the lens shift mechanism unit 7 is provided, it is possible to shift the substantial position Xv of the display panel unit Ppp to the front of the projector main body 2p, particularly to the outside of the projector main body 2p. Therefore, even when the lens shift mechanism unit 7 is combined with the lens shift mechanism unit 7, the arrangement position of the lens shift mechanism unit 7 or the shift range (shift rate) is selected without increasing the size of the lens shift mechanism unit 7. It is possible to easily and flexibly deal with such problems.

Further, the optical converter 1 is attached to and detached from the projector main body 2p excluding the optical system, and is projected onto the projected surface 4 to display the image by projecting the emitted light emitted from the projector main body 2p onto the projection lens 3. Since the predetermined optical system 5 is configured by combining them, the optical converter 1 can be configured as an independent single unit (unit). Therefore, it is excellent in versatility and expandability, for example, it can be retrofitted to an optical device P such as an existing projector Pp provided with an interchangeable projection lens unit 3.

Next, a modified embodiment of the optical converter 1 and the optical device P according to the present invention will be described with reference to FIGS. 1, 4, and 13 to 17.

First, the first modified embodiment will be described. The optical converter 1 according to the first modified embodiment has a form excluding the image angle conversion unit 8. That is, the optical converter 1 shown in FIG. 2 includes a lens shift mechanism unit 7, an image angle conversion unit 8, and a relay lens unit 6 as a basic configuration, but the first modified embodiment is shown in FIG. The image angle conversion unit 8 is removed from the optical converter 1 shown in 2, and the flange portion 7f of the lens shift mechanism portion 7 is directly coupled to the flange portion 6f of the relay lens portion 6. Therefore, even in the optical converter 1 according to the first modified embodiment, as shown in FIG. 14, as in the optical converter 1 shown in FIG. 2, the lens shift mechanism unit 7 is not changed, as shown in FIG. The shift range (shift rate) of the screen displaying the images Vs can be significantly expanded in the vertical direction Fv and the horizontal direction Fh.

The function of the optical converter 1 according to the first modified embodiment will be described with reference to the flowchart shown in FIG. The flowchart of FIG. 17 shows a processing procedure excluding the processing (function) by the image angle conversion unit 8 from the flowchart shown in FIG. Even in the flowchart shown in FIG. 17 excluding the image angle conversion unit 8, the basic steps are the same as the flowchart shown in FIG. 12, but since the image angle conversion unit 8 is removed, the image angle can be converted. The related elements are no longer needed.

That is, although step S11 in FIG. 17 corresponds to step S1 in FIG. 12, the image captured by the video camera does not necessarily have to be captured on a vertically long screen, and may be a normal horizontally long screen. Further, step S12 in FIG. 17 corresponds to step S2 in FIG. 12, but is not necessarily specified when the projector P is installed in a horizontal state. On the other hand, step S13 of FIG. 17 corresponds to step S3 of FIG. 12 as it is, and steps S14 and S15 of FIG. 17 correspond to steps S5 and S6 of FIG. 12 as they are. On the other hand, step S16 in FIG. 17 corresponds to step S7 in FIG. 12, but the screen for displaying the image projected on the projected surface portion 4 has the same orientation as the image captured by the video camera, so that the display is vertically long. It is not limited to.

Next, the second modified embodiment will be described. The optical converter 1 shown in FIG. 2 is used in combination with a general projector Pp including a projector main body 2p and a projection lens 3, and in particular, a projection lens 3 mounted on the projector Pp. Will be used as it is. On the other hand, the second modified embodiment is an optical converter 1 that does not use the projection lens unit 3 provided in the projector Pp. That is, a dedicated projection lens unit 3 is provided on the exit side of the lens shift mechanism unit 7 provided in the optical converter 1 shown in FIG. 2, and the overall configuration is the same as that shown in FIG. Become. Therefore, according to the optical converter 1 according to the second modified embodiment, the projection lens unit 3 mounted on the projector Pp is used only by exchanging the optical converter 1 according to the second modified embodiment. be able to. According to the second modified embodiment configured in this way, the projection lens unit 3 can be designed as a projection lens dedicated to the optical converter 1, so that the projection lens unit 3 is lens-shifted with the relay lens unit 6. There is an advantage that the optical converter 1 can be optimized, for example, an optimum optical converter 1 that matches the mechanism unit 7 or the like can be constructed.

Next, the third modified embodiment will be described. The third modified embodiment is configured by integrally incorporating the optical converter 1 into the projector Pp in advance. Therefore, the projector integrally provided with the optical converter 1 in the third modified embodiment constitutes the projector Pp which is the optical device P according to the present invention. That is, the projector Pp configured as the third modified embodiment has the projector main body 2p (optical device main body 2) excluding the optical system and the emitted light emitted from the projector main body 2p (optical device main body 2). When constructing an optical device including an optical system having a projection lens unit 3 that projects an image onto a projected surface unit 4 and displays an image, the actual display panel unit Ppp built in the projector main body 2p (optical device main body 2) is actually used. A relay lens unit 6 that shifts the substantial position Xv of the display panel unit Ppp to the front of the optical traveling direction Fc with respect to the arrangement position Xs of the above, and a projection lens unit 3 arranged in front of the optical traveling direction Fc of the relay lens unit 6. The optical system 5 is provided with a lens shift mechanism unit 7 that supports the projection lens unit 3 and displaces the projection lens unit 3 in the vertical direction Fv and the horizontal direction Fh.

Although the optimum embodiment (modified embodiment) has been described in detail above, the present invention is not limited to such an embodiment, and the present invention is described in terms of detailed configuration, shape, material, quantity, numerical value, and the like. It can be changed, added, or deleted arbitrarily as long as it does not deviate from the gist of.

For example, 0.5 times has been exemplified as a magnification for reducing the variable magnification function in the relay lens unit 6, but it can be implemented with various magnifications. On the other hand, the lens shift mechanism unit 7 shows a configuration in which the lens shift mechanism unit 7 is displaced in both the vertical direction Fv and the horizontal direction Fh, but the configuration in which the lens shift mechanism unit 7 is displaced in only one of the vertical direction Fv and the horizontal direction Fh is not excluded. Further, although an example in which a liquid crystal panel based on the liquid crystal system is used as the display panel unit Ppp is shown, a display panel based on various display methods such as a display panel based on the DLP method can be applied. Further, although the case where the image angle conversion unit 8 is configured by combining a plurality of prism members 8a, 8b, 8c is illustrated, other functions such as a combination of a plurality of mirror members are exhibited. It can be replaced by means. Therefore, by configuring the image angle conversion unit 8 with a plurality of reflecting surfaces 8am, 8bm, 8cm, a plurality of prism members 8a, 8b, 8c and a plurality of mirror members can be combined to form a specific component. Without limitation, it can be used as an image angle conversion unit 8 having excellent versatility and expandability.

The optical converter according to the present invention can be used for various projectors having a detachable projection lens unit and various optical devices having the same display function, and the optical device can be a person who has taken a portrait as an example. It can be used for various display purposes, including the case of projecting and displaying a vertically long subject (image).

Claims (8)

In an optical device including an optical device main body excluding an optical system and an optical system having a projection lens unit that projects emitted light emitted from the optical device main body onto a projected surface to display an image, the optical device main body. The display panel unit is arranged in front of the optical device main body, and the actual position of the display panel unit is changed to the front in the optical light direction with respect to the actual arrangement position of the display panel unit built in the main body of the optical device. A relay lens unit that reduces the image displayed by the light emitted from the display panel unit at the actual position with respect to the image displayed by the light emitted from the display panel unit at the installation position by an arbitrary magnification, and this relay lens. An image obtained by rotating an image at a predetermined angle related to the emitted light emitted from the relay lens portion with the optical axis as the center of rotation by arranging the portions in front of the optical traveling direction and forming a combination of a plurality of reflecting surfaces. An image angle conversion unit that converts to the image angle conversion unit, and a lens shift mechanism unit that is arranged in front of the image angle conversion unit in the optical traveling direction to support the projection lens unit and displace the projection lens unit in the vertical and / or horizontal directions. An optical device comprising an optical system having the above. The optical device according to claim 1, wherein the image angle conversion unit includes a prism unit in which a plurality of prism members are combined. The optical device according to claim 2, wherein the prism unit is composed of three prism members arranged along an optical path. A predetermined optical system is configured by attaching to and detaching from the main body of the optical device excluding the optical system and combining it with a projection lens that displays an image by projecting the emitted light emitted from the main body of the optical device onto the surface to be projected. The optical converter is arranged in front of the optical device main body in the optical traveling direction, and the actual position of the display panel is set with respect to the actual arrangement position of the display panel built in the optical device main body. An arbitrary image displayed by the light emitted from the display panel unit at the actual position is displayed with respect to the image displayed by the light emitted from the display panel unit at the actual arrangement position while shifting forward in the light advance direction. By arranging the relay lens unit that is reduced by magnification and the relay lens unit in front of the optical traveling direction and combining a plurality of reflecting surfaces, an image at a predetermined angle related to the emitted light emitted from the relay lens unit can be obtained. , An image angle conversion unit that converts an image rotated around the optical axis as the center of rotation, and an image angle conversion unit located in front of the optical direction of the image angle conversion unit to support the projection lens unit and support the projection lens unit in the vertical direction and / Or an optical converter comprising an optical system having a lens shift mechanism portion that is displaced in the lateral direction. The optical converter according to claim 4, wherein the image angle conversion unit includes a prism unit in which a plurality of prism members are combined. The optical converter according to claim 5, wherein the prism unit is composed of three prism members arranged along an optical path. The optical converter according to claim 4, wherein the image angle conversion unit includes a back focus adjustment mechanism unit capable of adjusting the back focus on the optical device main body portion on the emission side. The optical converter according to claim 4, wherein the lens shift mechanism unit includes the projection lens unit integrally on the emission side.

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