JP2011193337A - Lens device for projector, and projector device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform efficient trapezoidal-distortion compensation when adjusting a projection angle of an image in a projector device of a lens exchange type. <P>SOLUTION: A lens device for a projector includes a projection lens 21 for projecting image light, a lens case where the projection lens is contained, a terminal portion 25 for communicating information with the projector body which generates image light, and a memory 23. Data stored in the memory 23 are data for correcting distortion of the image light projected by the projection lens. The data stored in the memory are read out to the body of the projector device 10 during communication through the terminal portion. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projector lens device mounted on a projector device that projects an image on a screen, and a projector device mounted with the lens device, and more particularly to a technique applied to a lens-exchangeable projector device.

Various projector devices that project an image onto a screen have been commercialized.
For example, as shown in FIG. 11, image light is projected from the lens device 2 mounted on the projector device 1 onto the screen 4 and an image is displayed on the screen 4.

  In order to perform such a display, it is preferable from the viewpoint of optical characteristics that the projection is originally performed on the screen 3 at a position where the center optical axis of the lens device 2 mounted on the projector device 1 is the center point of the image. Are often projected onto the screen 4 at a position shifted upward or the like. FIG. 11 shows an example in which the projector device 1 is installed on a table or the like, and thus the example is shifted upward. However, when projecting the projector device by suspending it from the ceiling, the projector device is shifted downward as opposed to FIG. In some cases, it may be displayed. Further, not only the vertical shift but also the horizontal shift may be performed.

  When the display position is shifted, the lens apparatus 2 attached to the projector apparatus 1 is shifted. For example, the shift of the lens device may be adjusted by manually operating a shift adjustment knob attached to the projector device, or may be performed electrically using a motor built in the lens device. In any case, by performing a shift adjustment operation, for example, in the case of a shift in the vertical direction, the display position of the image is shifted in the vertical direction as indicated by the arrow v, and can be displayed at a desired height. . When shifting in the horizontal direction, the display position of the image is shifted in the left-right direction as indicated by an arrow h.

  On the other hand, this type of projector apparatus has been developed in which a lens apparatus can be replaced. By adopting the interchangeable lens system, it is possible to mount an optimum lens device in accordance with the purpose of using the projector device. For example, when the projection distance to the screen is short, a wide-angle lens is attached, when the projection distance is long, a telephoto lens is attached, and when it is compatible with various projection distances, a zoom lens is attached. . Alternatively, an appropriate lens can be selected due to factors other than wide angle and telephoto. Patent Document 1 describes an example of a projector apparatus that uses an interchangeable lens.

JP 2006-259550 A

  By the way, when the projection angle is adjusted as described with reference to FIG. 11 and launch projection is performed to project to a position beyond the lens shift range, it is necessary to compensate for trapezoidal distortion of the projected image. When projected and projected upward without compensating for trapezoidal distortion, a trapezoidal image in which the upper side of an image that is originally a quadrangle spreads out is formed. When performing keystone correction (keystone correction), the keystone table is used for correction.

  In order to compensate for the trapezoidal distortion, the projected image generated in the projector device is an image having a shape that compensates for the generated trapezoidal distortion (that is, a shape in which the trapezoidal distortion has occurred), and the compensated image is projected. . By doing so, even when launching or falling projection exceeding the range that can be dealt with by lens shift is performed, a square image without trapezoidal distortion is projected on the screen.

  The trapezoidal distortion compensation process itself is performed by a conventional projector device, but the characteristics of the projection lens are required to perform the trapezoidal distortion compensation process. That is, the keystone table for obtaining a correction value for compensating for the trapezoidal distortion at the time of shift adjustment has a characteristic matched to the lens mounted on the projector apparatus.

  On the other hand, in the case of an interchangeable lens type projector device as described above, it is necessary to change parameters for compensating for trapezoidal distortion at the time of launching or projecting down each time a lens is exchanged. It was difficult to set appropriate parameters.

  As one technique for solving this problem, for example, parameters of a plurality of types of lenses are stored in advance in the projector device, and an appropriate one is selected from the stored types of parameters according to the mounted lenses. It is conceivable to select one. However, in this method of preparing parameters in advance, even if a newly released lens device with a different characteristic is mounted after the projector device is manufactured, the parameter value of the lens device is stored in the projector device. There is a problem that can not be handled because there is not.

  The present invention has been made in view of these points, and in a lens-interchangeable projector apparatus, it is possible to satisfactorily compensate for trapezoidal distortion when adjusting the projection angle beyond the range that can be dealt with by lens shift. The purpose is to do.

  The present invention provides a projector lens device that includes a projection lens that projects image light, a lens housing that houses the projection lens, a terminal unit that exchanges information with a projector main body that generates image light, and a memory. Prepare. The data stored in the memory is data for correcting distortion of image light projected by the projection lens. Then, the stored data in the memory is read out to the projector main body through the exchange through the terminal unit.

  As a result, the data stored in the memory is read out on the side of the projector apparatus to which the lens apparatus is mounted, and a table for correcting image light distortion is generated based on the read-out data. Then, the correction process is performed with the data of the table.

  According to the present invention, even when the lens device to be mounted on the projector device is replaced, the table for correcting the distortion of the image light based on the data read from the memory built in the lens device is provided. Is updated to a value suitable for. Therefore, even when the lens device attached to the projector device is replaced, it is possible to appropriately correct image distortion when performing shift correction of the projection position or the like.

It is a block diagram which shows the apparatus structural example by one embodiment of this invention. It is a flowchart which shows the process example at the time of power-on of the projector apparatus by one embodiment of this invention. It is a flowchart which shows the example of a keystone correction value change process by one embodiment of this invention. It is a flowchart which shows the example of a lens shift change process by one embodiment of this invention. It is a flowchart which shows the example of a process in the case of the lens unit without a lens memory by one embodiment of this invention. It is explanatory drawing which shows the correction example of the trapezoid distortion according to the lens characteristic by one embodiment of this invention. It is explanatory drawing which shows a projection image and each parameter. It is explanatory drawing which shows the example of data of keystone correction | amendment. It is explanatory drawing which shows the example of data for keystone correction table preparation. It is explanatory drawing which shows the example of a lens information display by one embodiment of this invention. It is explanatory drawing which shows the example of the projection state by a projector apparatus.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described in the following order with reference to the accompanying drawings.
1. Configuration example of projector device and lens unit (FIG. 1)
2. Operation example of projector device (FIGS. 2 to 5)
3. Details of keystone correction and its correction table generation processing (FIGS. 6 to 9)
4). Example of lens information display (Fig. 10)
5. Description of modification

[1. Example of projector device and lens unit configuration]
FIG. 1 is a diagram illustrating a configuration example of a projector apparatus.
The projector device 10 is of a so-called interchangeable lens type in which a lens unit 20 that is a lens device is detachable.
In the projector 10, processing in each unit is executed under the control of the control CPU 11. The input signal processing unit 12 performs input processing of an image signal (video signal) input to the projector device 10, and the input image signal is converted into a display image signal by the image conversion unit 13. The image conversion unit 13 also performs correction processing as a keystone correction unit. The keystone correction will be described later.

The image signal converted by the image conversion unit 13 is supplied to the OSD processing unit 14 to perform display processing for an on-screen display (OSD) such as characters and numbers as necessary. The menu screen is also generated by the OSD processing unit 14.
The image signal processed by the OSD processing unit 14 is supplied to the panel driving unit 15 to perform display driving of the liquid crystal display panel.

Although not shown in FIG. 1, the light from the light source is irradiated on the liquid crystal display panel to generate image light based on the image displayed on the liquid crystal display panel, and the image light is mounted on the lens unit mounting portion 17. Is incident on the lens unit 20.
Commands from the control CPU 11 to each unit are supplied via the control bus line 16.

  Further, the control CPU 11 reads stored data in the memory 18 for storing various setting data necessary for the projector device, and controls the projection of the image. One of the data stored in the memory 18 is a keystone table. In addition, the projector device 10 includes an operation unit 19 and sets a projection state or the like to a corresponding state based on an instruction by an operation of the operation unit 19 by a user. One of the states set by the operation unit 19 is shift adjustment of the projection position. The operation unit 19 may be a key disposed on the remote control device in addition to a key disposed on the projector device body.

  In addition to a lens mount (not shown) for mounting the lens unit 20, the lens unit mounting unit 17 includes terminals 17a and 17b that communicate with the mounted lens unit 20 side. The terminal 17a is a terminal that supplies a signal for driving the lens motor. The terminal 17b is a terminal for reading data stored in a memory in the lens unit 20.

  A lens unit 20 that is a lens device mounted on the lens unit mounting portion 17 of the projector device 10 includes a projection lens 21 housed in a housing, and projects image light incident from the projector device 10 side onto the screen side. Let Various projection lenses 21 are assumed depending on the configuration of the lens unit 20. For example, any of a zoom lens that covers from a wide angle to a telephoto lens and a single focus lens with various focal lengths may be used.

The lens unit 20 includes a lens motor 22 and a lens memory 23 and is housed in a housing that constitutes the lens unit 20.
The lens motor 22 is a motor that performs zoom adjustment or focus adjustment of the lens. A driving command for the lens motor 22 is supplied via a terminal 24. When the lens unit 20 is mounted on the lens unit mounting portion 17 of the projector device 10, the terminal 24 of the lens unit 20 comes into contact with the terminal 17 a on the projector device side, and a command from the control CPU 11 arrives.

The lens memory 23 is a memory that stores data for correcting distortion of image light projected by the projection lens 21, and a non-volatile memory is used. More specifically, the data for correcting distortion is data for obtaining a keystone correction table for performing keystone correction. Details of the data for obtaining this keystone correction table will be described later. Further, detailed data of the lens such as the screen size, focal length, brightness, and keystone correction range that can be projected by the lens unit 20 is also stored in the lens memory 23.
The data stored in the lens memory 23 is data corresponding to the projection lens 21 in the lens unit 20, and correction data that matches the characteristics (focal length, etc.) of the projection lens 21 is stored. This stored data is stored when the lens unit 20 is manufactured.
Data stored in the lens memory 23 is read from the terminal 25 to the projector device 10 side. When the lens unit 20 is mounted on the lens unit mounting portion 17 of the projector device 10, the terminal 25 of the lens unit 20 comes into contact with the terminal 17 b on the projector device side, and the control CPU 11 reads the data stored in the lens memory 23. It will come out.

  Further, the projector device 10 includes a lens shift motor 26 for adjusting the screen position in the vertical and horizontal directions, and the lens shift motor 26 shifts the lens unit 20. By shifting the lens unit 20, the projection lens 21 arranged in the lens unit 20 is shifted. The lens shift motor 26 is driven by a command from the control CPU 11.

  In the example of FIG. 1, the lens unit 20 includes the lens memory 23. However, a lens unit that does not include the lens memory 23 may be attached to the projector device 10.

[2. Example of projector device operation]
Next, an example of the operation of the projector apparatus according to the embodiment will be described with reference to the flowcharts of FIGS. In the following description of the operation, a keystone table generation process and an operation for performing correction based on the keystone table will be mainly described.

First, with reference to the flowchart of FIG. 2, a process when the projector apparatus is turned on will be described.
When the power of the projector apparatus is turned on, the control CPU 11 determines whether or not the data stored in the memory 23 of the mounted lens unit 20 can be read (step S11). If it is determined that the data can be read out, the storage data is read from the memory 23 (step S12), and the keystone table is generated from the acquired storage data (step S13). Details of the keystone table generation process will be described later. Then, the generated keystone table is stored in the memory 18, and the process proceeds to a steady state (standby state) (step S15).

  If it is determined in step S11 that it is impossible to read the data stored in the memory 23 of the lens unit 20 mounted, a lens parameter input menu is additionally displayed when the menu screen is displayed on the projection image. (Step S14). After the setting, the process proceeds to the steady state (standby state) in step S15.

  Note that the reading process of the data stored in the memory 23 in step S12 includes, for example, the model number of the lens unit, parameters necessary for keystone correction, parameters necessary for lens zoom control and focus control, lens parameters necessary for installation, etc. There is.

Next, an example of the keystone correction value changing process will be described with reference to the flowchart of FIG.
First, it is determined whether or not the keystone setting value has been changed in the standby state (step S21). If it is determined that the image has been changed, an image correction state corresponding to the projection angle of the user is set from the keystone table generated in step S13 of the flowchart of FIG. 2 (step S22). Then, after setting the correction process, the process shifts to a standby state. Even if it is not changed in step S21, it shifts to the standby state.

Next, an example of lens shift position change processing will be described with reference to the flowchart of FIG.
In the lens shift position changing process, for example, a change instruction is given by a user operation of the operation unit 19 shown in FIG. Shift processing is performed.
Referring to FIG. 4, it is first determined whether or not there is a lens shift position change operation (step S31). If it is determined that there is a change operation, a new lens shift position is acquired (step S32). Then, the keystone table is regenerated according to the acquired lens shift position (step S33). From the regenerated keystone table, the projection image is corrected according to the setting value of the user (step S34). The projection image is corrected by the image conversion unit 13 shown in FIG.
Then, it shifts to a standby state. Even when it is determined in step S31 that there is no lens shift position change operation, the process shifts to a standby state.

Next, in step S11 of the flowchart of FIG. 2, it is determined that the connected lens unit 20 is not equipped with a memory, and in step S14, a processing example is set to additionally display a lens parameter input menu. This will be described with reference to the flowchart of FIG.
First, it is determined whether or not a lens setting menu is displayed (step S41). If the lens setting menu is displayed in this determination, a field for inputting each lens parameter value is displayed, and the user manually inputs the lens parameter value by operating the operation unit 19 (step S42). . The lens parameter value to be input is displayed in, for example, an instruction manual for the lens unit 20. Alternatively, it may be described on the surface of the housing of the lens unit 20.

Then, the keystone table is regenerated according to the lens acquisition shift position (step S43). However, this processing is limited to the case where the lens shift position can be acquired.
Then, the keystone correction corresponding to the setting value of the user is performed from the reproduced keystone table (step S44). After this correction process, the process shifts to a standby state. Even when it is determined in step S41 that the lens setting menu is not displayed, the process shifts to a standby state.

[3. Details of keystone correction and its correction table generation process]
Next, details of keystone correction, which is keystone distortion correction of an image projected by the projector device, will be described with reference to FIG.
First, FIG. 6 shows an outline in which the keystone correction state changes according to the lens characteristics.
Correction images at the time of launch projection with the display position on the upper side of the rectangular image 100 when the launch angle is projected at 0 ° are shown as corrected images 110 and 120. The corrected images 110 and 120 are the shapes of images displayed on the display panel by the panel driving unit 15. When the corrected image 110 or 120 is projected onto the screen by the corresponding launch projection, it is displayed on the screen as a square image 100 that has been subjected to distortion correction.

  Here, the corrected image 110 is a corrected image in the case of a certain lens characteristic, and the left and right edges 111 and 112 on the image are positioned below the inner left and right edges 101 and 102 on the original image. Has changed. The positions of the ends 111 and 112 change along the broken curve a in accordance with the lens projection angle, and the corrected image 110 is obtained at a certain projection angle.

  The change characteristic of the curve a is in the case of a projection lens having a certain parameter. When the projection lens is different, another change characteristic is obtained. The change characteristic of the curve b is in the case of a projection lens with another parameter, and even if the launch angle is the same as that of the corrected image 110, the corrected image 120 is in a different correction state. The curve b of the change characteristic of the corrected image 120 shows the change in the position of the ends 121 and 122 of the corrected image 120.

Next, details of the keystone table for performing keystone correction will be described. The following three parameters are necessary for creating the keystone table.
1. Launch angle θVup from the center of the lens to the top edge of the screen
2. Downward angle of the top edge of the screen from the lens center position θVdown
3. Angle next to the screen from the lens center position θHl_r

  FIG. 7 illustrates these angles. 7A is a side view of the projection state from the projector device (left side) to the screen (right side), and FIG. 7B is a view of the projection state from the projector device (left side) to the screen (right side). It is the figure seen from the top, and FIG.7 (c) is an example of a projection image. The example of FIG. 7C is a projection image 99 that is shifted upward from the center c within a range that can be projected by a projection lens indicated by a circle. 7A and 7B, L is the distance from the lens to the screen.

The launch angle θVup and the launch angle θVdown are determined by the screen heights ScreenV and ScreenVdn as shown in FIG.
The screen horizontal angle θHl_r is determined by the half screen width ScreenH / 2 as shown in FIG.
In addition, the screen in FIG. 7 shows the range where the real image on a screen is displayed. Moreover, in the example of FIG. 7, it is assumed that the horizontal direction is equal on the left and right, and only an up and down shift is performed. When shifting left and right angles, the angle θHl_r also requires two parameters, the left angle and the right angle.

  FIG. 8 shows an example of data for this keystone correction. Here, a zoom lens is used, and a value on the telephoto side (TELE), a value on the wide-angle side (WIDE), and an average value are calculated. Show. In the case of the present embodiment, the keystone table is created by setting the average value of the telephoto side value and the wide angle side value as a parameter.

  The control CPU 11 obtains the values L, ScreenV, ScreenVdn, and ScreenH / 2 shown in FIG. 8 from the lens memory 23, and also obtains three parameters θVup, θVdown, and θHl_r necessary for creating the keystone table from the memory 23. Using the obtained parameters, a keystone table is created and stored in the memory 18 in the projector apparatus 10.

FIG. 9 shows more detailed data examples of the three parameters θVup, θVdown, and θHl_r obtained from the memory 23. A keystone table is created based on the data shown in FIG.
As shown in FIG. 9, display horizontal resolution (Nph), display vertical resolution (Npv), image aspect ratio (Wn0 / Hn0), horizontal left edge angle (φHL), horizontal right edge angle (φHR) Need. Further, an upper edge angle (φVT) in the vertical direction and a lower edge angle (φVB) in the vertical direction are required. Furthermore, values such as the image height (Hn0) and the image width (Wn0) are also required.
The image height Hn0 is calculated from tan (φVT) + tan (φVB). The image width Wn0 is calculated from tan (φHL) + tan (φHR).

Based on the data thus obtained, a keystone table is created, and a keystone correction value of a projection image (display image) is obtained from the keystone table, and correction processing is performed.
Each value shown in FIG. 8 and FIG. 9 shows one example for explanation, and naturally the value is different if the lens characteristic is different, and the processing of this embodiment is applied. Above, it is not limited to this value.

[4. Example of lens information display]
Next, with reference to FIG. 10, an example in which lens information is displayed in an OSD display in a projection image by the projector apparatus of the example of the present embodiment will be described. The display of the lens information shown in FIG. 10 is displayed when the user selects the display of the lens information by an operation on the menu screen, for example, and is displayed based on the data read out from the lens memory 23 by the control CPU 11. Is.

In this example, the possible range of the projection distance for a plurality of screen sizes is shown as lens unit information. The screen size is shown in inches and the projection distance is shown in meters.
Then, “1.2 times zoom lens (electric)” is displayed as lens information, and numerical values of focal length and brightness are displayed.
Further, “keystone correction range ± 30 degrees” is displayed, and the shiftable range in which keystone correction is possible is also displayed based on the data read from the lens memory 23.

When the lens information shown in FIG. 10 is displayed and the lens unit 20 not equipped with the lens memory 23 is mounted, the lens parameter input screen is displayed as shown in the flowchart of FIG. The
In this lens parameter input screen, an input screen for the three parameters (launch angle θVup, decrement angle θVdown, and lateral angle θHl_r) necessary for creating the above-described keystone table is displayed. For example, when the three parameter values are displayed as blanks, and the three parameter values are input through the operation of the operation unit 19 and the confirmation operation is performed, the input screen display is terminated.

As described above, according to the projector device of the present embodiment, even when the lens unit is configured to be replaceable, the data necessary for keystone correction is obtained from the memory in the lens unit, and the lens unit is replaced. Will be able to deal with. That is, by switching on the power of the projector device after the lens unit is replaced, the keystone table in the projector device is updated to a keystone table corresponding to the new characteristic value of the lens unit. Therefore, even if the lens is exchanged, the keystone correction by the lens shift can always be properly performed. In addition, since a memory is provided in the lens unit to store data necessary for keystone correction, for example, even when a new lens unit developed after manufacturing the projector device is mounted, the lens unit can be used. Appropriate parameters can be acquired. Alternatively, even when a developed lens unit is mounted before manufacturing a new product, it can be dealt with if the lens unit has a memory.
Further, as shown in FIG. 10, the details of the lens unit information can also be acquired and displayed based on the data stored in the memory in the lens unit, so that the screen size and the projection distance can be understood, It becomes a standard when installing and improves usability.

  If the data required for keystone table generation cannot be obtained from the attached lens unit, the menu screen displayed on the projector device displays the input screen for the three parameters required for keystone table creation. The For this reason, even when a lens unit without a memory is mounted, or when the projection angle is adjusted beyond the range that can be dealt with by lens shift, the correction can be appropriately performed.

[4. Description of modification]
In the embodiments described so far, the case of performing correction by adjusting the projection angle in the vertical direction has been described. However, correction of the left and right projection angles is performed from data stored in the memory in the same lens unit. Also good. Further, each item shown in FIGS. 8 and 9 is an example, and a keystone table may be generated from data of other items to compensate for trapezoidal distortion.

  Further, in the flowchart of FIG. 2, when the power is turned on, data is acquired from the lens-side memory and a keystone table is created. A table may be created. For example, when the replacement of the lens unit is detected by any processing, reading from the memory in the lens unit may be performed. Alternatively, when the user performs an operation such as updating the lens information through an operation on the menu screen or the like, the keystone table may be generated by reading from the memory in the lens unit.

  Further, the display example of the lens information shown in FIG. 10 is an example, and other display modes may be used. In the lens memory in the lens unit, only the data necessary for creating the keystone table is stored, and the other lens unit information is not stored. The lens information shown in FIG. It is good also as a structure which cannot be performed.

  DESCRIPTION OF SYMBOLS 10 ... Projector apparatus, 11 ... Control CPU, 12 ... Input signal processing part, 13 ... Image conversion part (keystone correction part), 14 ... OSD processing part, 15 ... Panel drive part, 16 ... Control bus line, 17 ... Lens mounting part, 17a, 17b ... Terminal, 18 ... Memory, 19 ... Operation part, 20 ... Lens unit, 21 ... Projection lens, 22 ... Lens motor, 23 ... Lens memory, 24, 25 ... Terminal, 26 ... Lens shift motor

Claims (5)

A projection lens for projecting image light;
A lens housing containing the projection lens;
A terminal for exchanging information with the projector main body for generating the image light;
A projector lens apparatus comprising: a memory for storing data for correcting distortion of the image light projected by the projection lens, and a memory for reading the stored data to the projector main body through exchange via the terminal unit. The projector lens device according to claim 1, wherein the data for correcting distortion of image light stored in the memory is data for obtaining a keystone correction table for performing keystone correction. The data for obtaining the keystone correction table stored in the memory obtains the launch angle at the top edge of the screen from the lens center position, the drop angle at the top edge of the screen from the lens center position, and the horizontal angle from the lens center position. The projector lens device according to claim 2, wherein the projector lens device is a parameter. A projector apparatus body that generates image light to be projected based on an input or stored image signal;
A lens housing attached to the image light output section of the projector device body;
A projection lens housed in the lens housing;
A lens device that is housed in the lens housing and stores data for correcting distortion of the image light projected by the projection lens, and a memory in which the stored data is read out to the projector body. Projector device. Data for correcting distortion of image light stored in the memory is data for obtaining a keystone correction table for performing keystone correction,
5. The projector apparatus body reads data from the memory at a predetermined time, generates the keystone correction table, and performs a correction process of the distortion of the image light based on the generated keystone correction table. Projector device.

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