JP7023441B2 - Optical equipment and transducers - Google Patents

Description

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

Generally, a projector (optical device) that projects emitted light emitted from a projector main body portion to a screen portion through a projection lens portion and displays an image on the screen portion is widely known. Further, as an installation method of this type of projector, a stationary type and a ceiling-mounted type are known. Usually, the ceiling-mounted type has a hanging metal fitting on the ceiling as disclosed in Patent Documents 1 and 2. It is fixed and a projector is attached to the lower end of this hanging bracket.

Since it is not necessary to secure a place for the projector to be placed on the ceiling, for example, the ceiling-mounted type is also adopted in the presentation venue 100 where a fashion show or the like as shown in FIG. 5 is held. In FIG. 5, reference numeral (101) indicates a projector mounted on the ceiling 103 via the hanging metal fitting 102. Then, at such a presentation venue 100, a portrait of a person 104 on the stage as a subject is photographed by a video camera (not shown), and the projector (101) enlarges and displays the person 104 on the screen portion 105 provided on the rear wall surface of the stage. There is.

Japanese Unexamined Patent Publication No. 2010-104766 Japanese Unexamined Patent Publication No. 2011-180407

However, the conventional projector (optical device) installed by the above-mentioned ceiling suspension type also has the following problems to be solved.

That is, since the projector (101) is usually installed in a horizontal state in which the longitudinal direction of the front view is located on the left and right, the screen shape is horizontally long. Therefore, in order to photograph the person 104 and enlarge and display only the person 104 on the vertically long screen unit 105, complicated processing such as trimming of the person 104 by image processing or the like is required. Moreover, since the number of pixels that can be effectively used is reduced, it also becomes a factor that lowers the image quality (resolution, etc.) of the enlarged image (video).

On the other hand, the video camera is laid down horizontally to take a portrait image in which the entire person 104 is placed on a vertically long screen, and the vertical position is vertically oriented in the longitudinal direction of the front view as shown by the projector 101v shown by the virtual line in FIG. If it is installed in the state, it can be enlarged and displayed as it is without performing image processing, but on the other hand, it is an irregular installation method for the projector (101), so it shifts to the screen on which the image is displayed by the lens shift mechanism. The range and the trapezoidal correction range cannot be sufficiently secured, and as shown by the virtual line in FIG. 5, the projector 101v must be installed at a position downward from the ceiling 103, that is, at a lower height.

After all, when using a conventional projector (101) to magnify a portrait image, it is necessary to set the installation posture vertically like the projector 101v, and install it at a lower position with respect to the ceiling. There was a problem in installability, especially for some applications, such as the need for the projector to be an obtrusive presence that is easily visible to the audience.

An object of the present invention is to provide an optical device and an optical converter that solves 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 onto the projected surface portion 4 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, three prism members 8a, 8b, 8c arranged along an optical path and having reflecting surfaces 8am, 8bm, 8cm are combined. By using the configured prism unit 8u and rotating at least a part of the prism members 8a, 8b, 8c about the optical axis as the center of rotation, the predetermined angle related to the emitted light Co from the optical device main body 2 is obtained. An image angle conversion unit 8 having an image angle changing function capable of changing an image Vs into an image Vt rotated at least in a perpendicular direction with the optical axis as the center of rotation, and an image angle conversion unit 8 arranged in front of the optical direction Fc of the image angle conversion unit 8. It is characterized by comprising an optical system 5 having a projection lens unit 3 and 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 / or the lateral direction Fh. And.

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, is arranged along an optical path, and has reflecting surfaces of 8 am, 8 bm, and 8 cm. An optical device main body is used by using a prism unit 8u composed of a combination of two prism members 8a, 8b, 8c and rotating at least a part of the prism members 8a, 8b, 8c with the optical axis as the center of rotation. An image angle conversion unit 8 having an image angle changing function capable of changing an image Vs having a predetermined angle related to the emitted light Co from the unit 2 into an image Vt rotated at least in a perpendicular direction with the optical axis as the center of rotation, and the image angle conversion unit 8. It is provided with a lens shift mechanism unit 7 that supports the projection lens unit 3 arranged in front of the optical direction Fc of the image angle conversion unit 8 and displaces the projection lens unit 3 in the vertical direction Fv and / or the horizontal direction Fh. It is characterized by.

In this case, according to a preferred embodiment of the invention, the optical system 5 has a substantially position Xv of the display panel unit Ppp relative to the actual arrangement position Xs of the display panel unit Ppp built in the optical device main body 2. A relay lens unit 6 that shifts to the front of the direction Fc and allows the emitted light Co from the display panel unit Ppp to enter the image angle conversion unit 8 can be provided, and the relay lens unit 6 is provided with an actual arrangement position. The image displayed by the emitted light Co from the display panel unit Ppp in Xs is provided with a scaling characteristic that reduces the image displayed by the emitted light from the display panel unit at the substantial position Xv by an arbitrary magnification. Is desirable. Further, the image angle conversion unit 8 can 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 emission 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) An image angle conversion unit 8 that converts an image Vs at a predetermined angle related to the emitted light Co from the optical device main body 2 into an image Vt rotated at least in a perpendicular direction with the optical axis as the center of rotation, and this image. Since it is provided with a lens shift mechanism unit 7 that supports the projection lens unit 3 arranged in front of the optical axis Fc of the angle conversion unit 8 and displaces the projection lens unit 3 in the vertical direction Fv and / or the horizontal direction Fh. Even when the video camera is set to a vertical screen for portrait photography, the image taken by the video camera can be displayed as it is while the optical device P such as a projector is kept in a general horizontal state. Even when such a display is performed, it is possible to avoid a problem that the image quality is unnecessarily deteriorated.

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

(3) 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.

(4) Since 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 and has high accuracy. The stable image angle conversion unit 8 can be configured.

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

(6) The prism unit 8u has an image angle changing function capable of changing the angle of the image Vs to an arbitrary angle by rotating at least a part of the prism members 8a, 8b, 8c with the optical axis as the center of rotation. Since it is provided, when the prism unit 8u is configured by the prism members 8a, 8b, 8c, it can be realized by assembling at least a part of the prism members 8a, 8b, 8c so as to be rotatable around the optical axis. .. As a result, 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 for the projected image, and it can be relatively easily implemented.

(7) According to a preferred embodiment, in the optical system 5, the substantial position Xv of the display panel portion Ppp is set in front of the optical device main body 2 with respect to the actual arrangement position Xs of the display panel portion Ppp built in the optical device main body 2. If a relay lens unit 6 is provided to allow the emitted light Co from the display panel unit Ppp to enter the image angle conversion unit 8, the actual position Xv of the display panel unit Ppp can be set to the front of the optical device main body 2. In particular, since it can be transferred to the outside of the optical device main body 2, even when combined with the lens shift mechanism 7, the lens does not increase in size. It is possible to easily and flexibly respond to the selection of the arrangement position of the shift mechanism unit 7 or the selection of the shift range (shift rate).

(8) According to a preferred embodiment, the light emitted from the display panel unit at the actual position Xv with respect to the image displayed by the image displayed by the display panel unit Ppp at the actual arrangement position Xs on the relay lens unit 6. If the image displayed in The 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 from the left and right, and the projected surface portion 4 can be easily enlarged. On the other hand, the installability (installation flexibility) of the optical device P can be dramatically improved, such as being able to be installed at a closer position.

(9) 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 on the optical device main body 2 on the emission side, various optical devices having different back focus can be 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.

(10) According to a preferred embodiment, if the projection lens unit 3 is integrally provided on the emission side of the lens shift mechanism unit 7, the projection lens unit 3 can be designed as a projection lens dedicated to the optical converter 1. The optical converter 1 can be optimized, for example, the optimum optical converter 1 can be constructed by matching the projection lens unit 3 with the relay lens unit 6 and the lens shift mechanism unit 7.

External plan view of the optical converter according to the preferred embodiment of the present invention, External plan view showing the state in which the optical converter is attached to a projector which is an optical device, Front view showing a part of the projector equipped with the optical converter, External perspective view of the optical converter, Schematic diagram showing an installation example using a ceiling-mounted projector equipped with the same optical converter, Lens data table of the relay lens part provided in the optical converter, Perspective view of the image angle converter provided in the optical converter, An exploded perspective view of the same image angle converter, Side sectional view showing the upper half of the back focus adjustment mechanism provided in the optical converter, External perspective view showing an example of a projector to which the optical converter can be attached, 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. A schematic configuration diagram showing an example of an optical system inside 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, Functional explanatory diagram of the relay lens part provided in the optical converter, Functional explanatory diagram of the image angle converter provided in the optical converter, Schematic block diagram for explaining the operation of the optical system including the optical transducer,

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, 8am: reflective surface, 8bm: reflective surface, 8 cm: reflective surface, 12: back focus adjustment mechanism, P: optical device, Pp: Projector, Ppp: Display panel, Vh: Image, Vs: Horizontal image, Vt: Vertical image, Co: Emitted light, Fc: Optical direction, Fv: Vertical direction, Fh: Horizontal direction, Xs: Arrangement Position, Xv: Substantial position

Next, the best 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 to which the optical converter 1 can be used will be described with reference to FIGS. 1, 10 to 12. In the embodiment, a general-purpose projector Pp is shown as an example of the optical device P.

As shown in FIG. 10, the projector Pp includes a projector main body 2p constituting 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. 1, 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. 1) on the 2p side of the projector main body portion. The above is the appearance configuration of the entire projector Pp. In FIG. 10, Ppp shown by a dotted line indicates a display panel portion such as a DMD (digital mirror device) or a liquid crystal panel built in the projector main body portion 2p, and a predetermined back focus is ensured for the projection lens portion 3. It is mounted in a fixed state at the arrangement position Xs of.

On the other hand, FIG. 11 shows a block configuration of an optical system and a signal system in the projector main body 2p. In FIG. 11, 21 indicates the above-mentioned cabinet, 3 indicates the above-mentioned projection lens unit, and Ppp indicates the above-mentioned display panel unit. 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 the 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. 33 indicates 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. 12 shows an example of the configuration of the optical system in the projector main body 2p. The optical system exemplified in FIG. 12 includes an illumination optical system 51, a color separation optical system 52, and a relay optical system 53, 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 the polarization are on the downstream side in the light advancing direction of the light source unit 32. 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 transmit G light and B light to the dichroic mirror 65, and the reflected light (R light) of this 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 penetrates 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 dichroic 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. The 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 liquid crystal panel 56 for R light, the liquid crystal panel 57 for G light, and the liquid crystal panel 58 for B light constitute the display panel unit Ppp. The above-exemplified optical system constitutes a known general projector element. In FIG. 12, 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. 12, 4 shows a projected surface portion using a flat screen.

Further, as shown in FIG. 11, 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 for exchanging and receiving communication with the outside, a control unit 39 including a CPU and performing 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 9 and 15.

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 optical traveling 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, 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 of shifting to the front of the optical direction Fc, that is, a relay function. Further, in addition to the relay function, the exemplary relay lens unit 6 converts an image displayed by the emitted light Co from the display panel unit Ppp at the actual arrangement position Xs into an image that enters the relay lens unit 6. On the other hand, it has a scaling characteristic (magnification function) that reduces the magnification by an arbitrary magnification.

In this way, the relay lens unit 6 is displayed by the emitted light 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. If the image has a variable magnification characteristic of reducing the image 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. Therefore, 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.

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. FIG. 6 shows the lens data of the relay lens unit 6 as an example. The relay lens unit 6 has a magnification of 0.5 times. In FIG. 6, nd is the refractive index and νd is the Abbe number. Further, in FIG. 6, the "object surface" in the surface number is the recombination surface.

Therefore, as shown in FIG. 1, the substantial position Xv (position corresponding to the imaging point) of the display panel portion Ppp at the arrangement position Xs inside the projector main body portion 2p is located outside the projector Pp by the relay lens portion 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. 2, 7 to 8 and 15. The image angle conversion unit 8 includes a housing 8h as an outer shell, and as shown in FIG. 1, has a flange portion 8fr connected to a flange portion 6f provided on the lens barrel 6c at the rear end of the housing 8h. The front end has a flange portion 8 ff. Further, the housing 8h incorporates the prism unit 8u shown in FIG. 7, which is configured by combining the three prism members 8a, 8b, 8c shown in FIG. 8. As a result, as shown in FIG. 15, 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, 8 cm indicate the reflecting surfaces of the prism members 8a, 8b, 8c, respectively.

In this way, if an image angle conversion unit 8 that converts a horizontal image Vs into a vertical image Vt with the optical axis as a fulcrum is provided between the relay lens unit 6 and the lens shift mechanism unit 7, a video camera can be obtained. Even when portrait photography is performed with a vertical screen, the image captured 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 can be avoided. 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, and translucency. 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. 8, since the image angle conversion unit 8 constitutes the prism unit 8u by combining a plurality of prism members 8a, 8b, 8c, the image angle conversion unit 8 has a prism member 8a ... At least a part of, that is, a part or all of the prism member 8a ... Is provided with an image angle changing function capable of changing the angle of the image Vs to an arbitrary angle by rotating the prism member 8a ... You can also. In this case, if a support structure that can rotate relatively 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 platen 7x displaced in the X-direction is supported by the mechanism), and the Y-direction movable platen 7y displaced in the Y-direction by an operation mechanism (drive mechanism) (not shown) is supported on the front surface of the X-direction movable platen 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 emission side (light entry side with respect to the lens shift mechanism unit 7) of the image angle conversion unit 8. Is provided. FIG. 9 shows a 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 long guides (in the example, three at equal intervals in the circumferential direction) 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 engages with and is guided by 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 large diameters, 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 portion 81p and 82n are in a forward / reverse relationship, if the adjusting ring 85 is rotated in the positive 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 a 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 a 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, so that it 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 and function of using the optical converter 1 according to the present embodiment will be described with reference to FIGS. 1 to 16.

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

At the time of use, first, as shown in FIG. 1, the projection lens portion 3 attached to the projector main body portion 2p is removed from the projector main body portion 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. 1, 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. 2 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. 1, arrow D2 shows an image of this operation. As a result, the already installed projector Pp can be changed to the 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. can.

Next, the overall function (action) of the projector Pp including the optical converter 1 will be described with reference to FIGS. 1 to 16. The overall function will be described step by step with reference to the flowchart shown in FIG. 13 for the projector Pp installed in the fashion show venue of FIG. 5 shown as an example.

In this case, as shown in FIG. 5, the projector Pp is horizontally attached to the ceiling 103 of the venue 101 via the hanging bracket 102, and is enlarged by a portrait image on the vertically long screen portion 4 on the wall surface behind the stage. Demonstrate the function to display. 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) lying 90 [°] sideways. The screen unit 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 taken 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 is given to the input unit of the projector Pp (projector main body 2p) (step S2). As a result, 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 passes through the relay lens 6 (step S3). Based on the lens data shown in FIG. 6, the relay lens unit 6 shifts the substantial position Xv of the display panel unit Ppp to the front of the optical direction Fc with respect to the actual arrangement position Xs of the display panel unit Ppp. Further, the image displayed by the emitted light emitted from the substantial position Xv of the display panel unit Ppp is 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. 14B shows an image Vs of an image based on the emitted light Co emitted from the projector main body 2p reduced 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. 14A shows the image Vh before reduction as an image for comparison 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 passing through the prism unit 8u (image angle conversion unit 8), as shown in FIG. 15, the image Vs in the horizontal direction is rotated by 90 [°] with 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. 15, the horizontal image Vs that enters the 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, light enters the next prism member 8b as the image Vm1. Since the prism member 8b has a different direction 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 direction 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 (in the example, 0.5 times), the shift range of the reduced image Vt (Vs) is greatly expanded. FIG. 14A shows a shift range in the case of an image (screen) Vh, and FIG. 14B shows a shift range in the case of an image (screen) Vs. The reference numeral A is an effective image circle. In the case of the image Vh, as shown in (a), 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. On the other hand, in the case of the image Vs, as shown in (b), 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 this way, the shift range of the reduced image Vs can be greatly expanded 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 passes through the projection lens unit 3 (step S6). The image Vt transmitted through the projection lens unit 3 is projected onto the screen unit 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 screen unit 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 magnified 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 image forming 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 aspects. ..

As described above, the optical converter 1 according to the present embodiment has, as a basic configuration, an image Vs at a predetermined angle related to the emitted light Co from the projector main body 2p in at least a perpendicular direction with the optical axis as the center of rotation. Supporting the image angle conversion unit 8 that converts the rotated image Vt and the projection lens unit 3 arranged in front of the optical direction Fc of the image angle conversion unit 8, the projection lens unit 3 is vertically Fv and / or lateral. Since it is provided with a lens shift mechanism unit 7 that shifts in the direction Fh, even when a video camera is set to a vertical screen for portrait photography, an optical device P such as a projector is generally used horizontally. The image taken by the video camera can be displayed as it is in the stationary state, and even when such a display is performed, it is possible to avoid a problem that the image quality is unnecessarily deteriorated.

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

Next, a modified embodiment of the optical converter 1 according to the present invention will be described with reference to FIGS. 1, 4, 13 to 16.

First, the first modified embodiment will be described. The optical converter 1 shown in FIG. 1 is used in combination with a general projector Pp including a projector main body 2p and a projection lens 3, and in particular, the projection lens 3 mounted on the projector Pp. Will be used as it is. On the other hand, the first modification 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 emission side of the lens shift mechanism unit 7 provided in the optical converter 1 shown in FIG. 1, and the overall configuration is the same as that shown in FIG. Become. Therefore, according to the optical converter 1 according to the first modified embodiment, the projection lens unit 3 mounted on the projector Pp is used only by exchanging the optical converter 1 according to the first modified embodiment. be able to. According to the first 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, the optimum optical converter 1 that matches the mechanism unit 7 or the like can be constructed.

Next, the second modified embodiment will be described. The second modified embodiment is configured by incorporating the optical converter 1 into the projector Pp in advance. Therefore, the projector integrally provided with the optical converter 1 in the second modified embodiment constitutes the projector Pp according to the present invention. That is, the projector Pp configured as the second modified embodiment has a projector main body 2p excluding the optical system and a projection lens unit that projects the emitted light emitted from the projector main body 2p onto the screen unit 4 to display an image. When constructing a projector including an optical system having a lens 3, the substantial position Xv of the display panel unit Ppp is set to the optical direction Fc with respect to the actual arrangement position Xs of the display panel unit Ppp built in the projector main body 2p. The relay lens unit 6 that shifts to the front, the projection lens unit 3 arranged in front of the Fc in the optical direction of the relay lens unit 6, and the projection lens unit 3 that supports the projection lens unit 3 are vertically Fv and / or It is configured to include an optical system 5 having a lens shift mechanism portion 7 that is displaced in the lateral direction Fh.

Although the best embodiment (modified embodiment) has been described in detail above, the present invention is not limited to such an embodiment, and 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, the relay lens unit 6 has a relay function of shifting the substantial position Xv of the display panel unit Ppp to the front of the Fc in the optical direction with respect to the actual arrangement position Xs of the display panel unit Ppp built in the projector main body 2p. It is sufficient to have, and as shown in the example, it is optional whether or not to have the scaling function. At this time, when the variable magnification function is provided, it is desirable to reduce the magnification by an arbitrary magnification, but the case of equal magnification or enlargement is not excluded. Although 0.5 times is exemplified as the magnification to be reduced, it can be carried out by various magnifications such as 0, 3 times, 0.8 times, and the like. On the other hand, the lens shift mechanism unit 7 has shown a configuration in which the lens shift mechanism unit 7 is displaced in both the vertical direction Fv and the horizontal direction Fh, but does not exclude a configuration in which the lens shift mechanism unit 7 is displaced in only one of the vertical direction Fv and the horizontal direction Fh. Further, as the display panel unit Ppp, a display panel based on various display methods such as a display panel based on the DMD method, a liquid crystal panel based on the liquid crystal method, and a display panel based on the DLP method can be applied.

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

Claims (8)

In an optical device including an optical device main body excluding the optical system and an optical system having a projection lens portion that projects the emitted light emitted from the optical device main body onto the projected surface portion to display an image, along the optical path. The optical device main body is used by using a prism unit configured by combining three prism members arranged and having a reflecting surface, and by rotating at least a part of the prism members around an optical axis as a rotation center. An image angle conversion unit having an image angle changing function capable of changing an image having a predetermined angle related to the light emitted from the unit into an image rotated at least in a perpendicular direction with the optical axis as the center of rotation, and an image angle conversion unit. It is characterized by comprising an optical system having the projection lens portion arranged in front of the light advance direction and a lens shift mechanism portion that supports the projection lens portion and displaces the projection lens portion in the vertical direction and / or the lateral direction. Optical device. The optical system shifts the substantial position of the display panel portion forward in the light advance direction with respect to the actual arrangement position of the display panel portion built in the optical device main body portion, and emits light from the display panel portion. The optical device according to claim 1, further comprising a relay lens unit that allows light to enter the image angle conversion unit. The relay lens unit displays an image displayed by the light emitted from the display panel unit at the substantial position with respect to an image displayed by the light emitted from the display panel unit at the actual arrangement position at an arbitrary magnification. The optical device according to claim 2, further comprising a scaling characteristic for reducing the magnification. A predetermined optical system is configured by attaching to and detaching from the optical device main body excluding the optical system and combining it with a projection lens unit that projects the emitted light emitted from the optical device main body onto the projected surface portion to display an image. An optical converter that is arranged along an optical path and is composed of a combination of three prism members having a reflecting surface, and at least a part of the prism members is centered on the optical axis. It has an image angle changing function that can change an image having a predetermined angle related to the light emitted from the main body of the optical device to an image rotated at least in a perpendicular direction with the optical axis as the center of rotation. It is provided with an image angle conversion unit and a lens shift mechanism unit that supports the projection lens unit arranged in front of the image angle conversion unit in the optical direction and displaces the projection lens unit in the vertical direction and / or the lateral direction. An optical converter characterized by that. The optical system shifts the substantial position of the display panel portion forward in the light advance direction with respect to the actual arrangement position of the display panel portion built in the optical device main body portion, and emits light from the display panel portion. The optical converter according to claim 4, further comprising a relay lens unit that allows light to enter the image angle conversion unit. The relay lens unit displays an image displayed by the light emitted from the display panel unit at the substantial position with respect to an image displayed by the light emitted from the display panel unit at the actual arrangement position at an arbitrary magnification. The optical converter according to claim 5, further comprising a scaling characteristic for reducing the magnification. The optical converter according to claim 4 or 5, 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 is integrally provided with the projection lens unit on the emission side.

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