JP2018063421A - Lens device and image projection device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device that can easily fit a projection image to a spherical screen through adjustment of the curvature of field, and an image projection device using the same.SOLUTION: A lens device comprises: a first optical system that changes the curvature of field through a movement in an optical axis direction; a control part that moves the first optical system to a target position in the optical axis direction specified on the basis of a predetermined amount input as the amount of the curvature of field, while the relationship between the position in the optical axis direction of the first optical system and the amount of the curvature of field is stored in advance; a position detection part that detects a reference position in the optical axis direction of the first optical system; and a movement amount detection part that detects the amount of movement in the optical axis direction of the first optical system from the reference position to the target position.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a lens apparatus and an image projection apparatus using the lens apparatus, and particularly to fitting a projection image to a spherical screen by adjusting the curvature of field.

  In an image projection apparatus, an image may be projected not only on a flat screen but also on a spherical screen. In this case, it is known to fit a projected image onto a spherical screen by adjusting the curvature of field (Patent Document 1).

JP 2011-145580 A

  However, it does not fit a projected image onto a spherical screen by adjusting the curvature of field by trial and error as is known in the past, but it is easier to project a projected image on a spherical screen by adjusting the curvature of field. What is fitting is desired.

  An object of the present invention is to provide a lens device that can easily fit a projected image onto a spherical screen by adjusting the curvature of field, and an image projection device using the lens device.

  In order to achieve the above object, a lens apparatus according to the present invention includes a first optical system that changes curvature of field by movement in the optical axis direction, a position of the first optical system in the optical axis direction, The first optical system is moved to a target position in the optical axis direction specified based on a predetermined amount input as the amount of field curvature, in a state where a relationship with the amount of field curvature is stored in advance. A control unit for detecting, a position detecting unit for detecting a reference position in the optical axis direction of the first optical system, and an amount of movement of the first optical system from the reference position to the target position in the optical axis direction And a movement amount detection unit for detecting.

  In addition, an image projection apparatus according to the present invention includes an image generation unit that generates an image, and a holding member that holds the lens device.

  According to the present invention, it is possible to easily fit a projected image onto a spherical screen by adjusting the curvature of field.

(A) is explanatory drawing which shows the lens apparatus which produces a field curvature in a screen surface, and a screen, (b) is a perspective view of the lens apparatus which concerns on embodiment of this invention. (A), (b) is sectional drawing in the WIDE state and TELE state of the lens apparatus which concerns on embodiment of this invention. (A), (b) is a perspective view of the lens apparatus based on embodiment of this invention. It is a figure which shows the optical system of the image projection apparatus which mounts the lens apparatus which concerns on embodiment of this invention as a projection optical system. (A), (b), (c), (d) is explanatory drawing of the lens apparatus which performs the flange back adjustment which concerns on embodiment of this invention. It is explanatory drawing of the lens shift unit of the lens apparatus which concerns on embodiment of this invention. (A), (b) is explanatory drawing of the adjustment mechanism in the lens apparatus which performs the flange back adjustment which concerns on embodiment of this invention. With the relationship between the position of the field curvature adjustment group in the optical axis direction and the curvature radius of the field curvature stored, the target position in the optical axis direction of the field curvature adjustment group from the input value of the curvature radius of the field curvature It is the figure which showed having specified. It is a flowchart of field curvature adjustment at the time of using an absolute position detection sensor. It is a flowchart of a field curvature adjustment at the time of using a movement amount detection sensor. It is a top view which shows the attitude | position and position of a lens apparatus, and the relationship between a focus surface. It is a perspective view which shows the relationship between the attitude | position and position of a lens apparatus, and a focus surface. It is a figure which shows the difference of the focus surface at the time of the shift of a lens apparatus, and the inclination. It is a figure which shows the inclination structure of a lens apparatus. It is a figure which shows the structure of a driving simulator.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<< First Embodiment >>
(Image projection device)
An image projection apparatus using the lens apparatus according to the embodiment of the present invention as a projection optical system will be described with reference to FIG. FIG. 4 illustrates the image projection apparatus optically, and FIG. 4 can also be said to represent an optical system unit.

  In FIG. 4, the lens device 20 includes a lens capable of adjusting the field curvature, which will be described in detail later. Reference numeral 22 denotes a light source lamp, reference numeral 23 denotes a UV cut filter for cutting out light in the wavelength band of the ultraviolet region, and reference numerals 24a and 24b denote light having no uneven brightness. It is a fly eye lens for irradiating 30 image generation surfaces.

  Reference numeral 25 denotes a PS conversion element for aligning the polarization direction, and reference numeral 26 denotes a condenser lens that aligns light with the image generation surface of the reflective liquid crystal panel 30 (30R, 30G, 30B). Reference numeral 27 denotes an illumination unit including a light source lamp 22, a UV cut filter 23, a fly-eye lens 24, a PS conversion element 25, and a condenser lens 26.

  Reference numeral 28 denotes a dichroic mirror that transmits light in the green wavelength band and reflects light in other wavelength bands. The light transmitted through the dichroic mirror 28 is reflected by the green prism 29 and enters the green reflective liquid crystal panel 30G. Then, after being reflected by the reflective liquid crystal panel 30G, it reaches the color combining prism 31.

  The red light reflected by the dichroic mirror 28 passes through the color select 32, passes through the blue-red prism 33, enters the red reflective liquid crystal panel 30 </ b> R, and then reaches the combining prism 31. The blue light reflected by the dichroic mirror 28 is transmitted through the color select 32 to change the polarization direction, is reflected by the blue-red prism 33 and is incident on the blue reflective liquid crystal panel 30B, and then enters the composite prism 31. To reach. Then, the red, blue, and green light that has reached the combining prism 31 is projected onto a screen (not shown) via the lens device 20 that is a projection optical system held by the lens shift unit 21.

(Lens shift unit 21)
The lens shift unit 21 shown in FIG. 4 is further outlined in FIG. The lens shift unit 21 operates the Z-direction moving dial 57 to move the lens device 20 together with the Z-direction moving plate 56 in the Z direction on the ZY plane. The position of the Z-direction moving plate 56 at this time is detected by a Z-direction position detection sensor 58. The lens shift unit 21 operates the Y direction movement dial 60 to move the lens device 20 in the Y direction of ZY together with the Y direction movement plate 59. The position of the Y-direction moving plate 59 at this time is detected by the Y-direction position detection sensor 61. In FIG. 6, reference numerals 62a, 62b, 62c, and 62d denote lens mounting portions.

(Lens device 20)
Hereinafter, the lens device 20 illustrated in FIG. 4 will be described with reference to FIGS. 1 to 3. Reference numeral 1 denotes a field curvature adjustment group (first optical system) that moves in the direction of the optical axis 15 to change the degree of field curvature of the projection screen 14 as 14a, 14b, or 14c. Specifically, the field curvature adjustment group 1 includes a position detection gear 19 (FIG. 3A) integrated with the field curvature adjustment group 1 by the field curvature adjustment motor 70. ) Can be moved in the direction of the optical axis 15. Then, the position detection sensor 7 (FIG. 1B) of the field curvature adjustment group as position detection means is provided via the position detection gear 19 of the field curvature adjustment group integrated with the field curvature adjustment group 1. The position of the field curvature adjustment group 1 can be detected by providing rotation to.

  Then, by changing the projected image plane 14 from 14a to 14c, 14b, it is possible to fit to a spherical screen. In FIG. 1A, 2 is a focus adjustment group in which the focus position is changed by moving in the direction of the optical axis 15, and 3 (3a, 3b, 3c, 3d) is projected by moving in the direction of the optical axis 15. This is a zoom adjustment group for changing the magnification. The fixed group 4 does not move.

  Reference numeral 5 denotes a focus adjustment cam ring for moving the focus adjustment group 2 in the direction of the optical axis 15. The focus adjustment group 2 moves by applying the driving force of the focus adjustment motor 9 (FIG. 1B) to the focus adjustment cam ring 5 via the focus drive gear 16 (FIG. 3A). The focus adjustment group 2 can detect the position as follows. That is, the focus adjustment position detection end detection sensor 11 (FIG. 1B) detects the initial position, and the amount of movement therefrom is detected as a focus adjustment group position detection rotation detection sensor 18 (FIG. 3B). The position can be detected by detecting the number of rotations in step)).

  A zoom adjustment cam ring 6 moves the zoom adjustment group 3 in the direction of the optical axis 15. Specifically, the zoom adjustment group 3 applies the driving force of the zoom adjustment motor 8 (FIG. 3B) to the zoom adjustment cam ring 6 via the zoom drive gear 17 (FIG. 3B). Move by that. The position of the zoom adjustment group 3 can be detected by the detection sensor 12 for detecting the zoom adjustment position (FIG. 1B). 2A shows the case where the zoom position is WIDE, and FIG. 2B shows the case where the zoom position is TELE.

  Reference numeral 100 denotes a remote controller as an input unit, which is used by the user to input the amount of field curvature (for example, the curvature radius of the spherical screen as the curvature radius of the field curvature surface) for fitting to the spherical screen. . The value input by the remote controller 20 is received by the receiving unit in the lens control board 13 (FIG. 1B) as the control unit.

(Storage of the relationship between the position of the field curvature adjustment group 1 in the optical axis direction and the amount of field curvature)
By moving the field curvature adjustment group 1 in the optical axis direction, field curvature is intentionally generated as shown in FIGS. 1A, 14B, and 14C, and fitting is performed on a spherical screen. be able to. At this time, in order to check whether the degree of curvature of field is fitting to the screen, it is necessary to measure at multiple points to see if the focus is on the screen. The work is difficult and complicated.

  Therefore, in this embodiment, as shown in FIG. 8, the position of the field curvature adjustment group 1 in the optical axis direction and the amount of field curvature (for example, the curvature of the spherical screen as the curvature radius of the field curvature surface). (Radius) is stored in the storage unit of the lens control board 13 as a control unit. Then, the user (user) inputs an amount of curvature of field (for example, a radius of curvature in a spherical screen) using the remote controller 100. Then, the input value input to the remote controller 100 is received by the lens control board 13 as a control unit by wireless communication.

  As a result, the lens control board 13 specifies the target position of the field curvature adjustment group 1 from the input value and information stored in advance, and sets the amount of movement toward the target position as shown in FIG. The field curvature adjustment group 1 is moved by the adjustment motor 70.

  In FIG. 9, an absolute encoder as a position detection unit is provided to detect whether the target position has been reached, that is, whether the detected position matches the target position.

  Hereinafter, with reference to FIG. 9 and FIG. 10, control relating to field curvature adjustment when the absolute position detection sensor such as the absolute encoder described above is used and when the movement amount detection sensor is used will be described.

(When using an absolute position detection sensor)
The field curvature adjustment when the absolute position detection sensor is used will be described with reference to FIG. In the flowchart shown in FIG. 9, first, the user inputs a field curvature adjustment value to the projector using the remote controller 100 (S1). Next, information regarding the relationship between the field curvature adjustment amount and the field curvature adjustment group position stored in advance by the projector is browsed (S2), and the field curvature that becomes the input field curvature adjustment value input by the user is displayed. The position (target position) of the adjustment group is determined (S3). Then, the field curvature adjustment group is moved until the detection result by the absolute value detection sensor matches the position of the field curvature adjustment group determined in S3, and the field curvature adjustment is finished (S4).

(When using a movement detection sensor)
Next, the field curvature adjustment when the movement amount detection sensor is used will be described with reference to FIG. First, when it is detected that the field curvature adjustment is necessary, such as an operation of the remote controller 100 by the user, the field curvature adjustment group is moved until it collides with the sensor A, and the sensor A detects the collision of the field curvature adjustment group. By doing so, the projector is made to recognize the reference position (S5). The sensor A functions as a position detection unit that detects a reference position in the optical axis direction of the field curvature adjustment group. Next, the field curvature adjustment group from the reference position detected in S5 to a position where the image surface becomes flat, for example. In order to move the motor, the motor is driven (S6).

  Next, the user inputs a field curvature adjustment value to the projector using the remote controller 100 (S7). Then, the information on the relationship between the field curvature adjustment amount and the field curvature adjustment group position stored in advance by the projector is browsed (S8), and the field curvature adjustment which becomes the input field curvature adjustment value input by the user. The position of the group (target position where the image plane becomes the target curved surface) is determined (S9).

  Then, the field curvature adjustment group is moved until the detection result by the sensor B coincides with the position of the field curvature adjustment group determined in S9, and the field curvature adjustment is finished (S10). The sensor A here is a sensor that can detect whether or not the field curvature adjustment group collides with the sensor A, and the sensor B detects the amount of rotation of the motor, that is, the amount of movement of the field curvature adjustment group from a predetermined position. It is a sensor that can.

  As described above, in the present embodiment, it is possible to easily fit the projection image to the spherical screen by curving the image plane without performing the measurement on the spherical screen.

<< Second Embodiment >>
The present embodiment has a second optical system that changes the focus state by moving in the optical axis direction, and the lens control board 13 as the control unit is in focus when moving the first optical system 1 to the target position. The second optical system is moved in the optical axis direction so as to suppress the change in state. Other points are the same as those in the first embodiment, and a description thereof will be omitted.

  In the present embodiment, the position of the focus adjustment group 2 as the second optical system, the position of the field curvature adjustment group 1 as the first optical system in the optical axis direction, and the amount of field curvature with respect thereto (For example, the curvature radius of the changed curved surface of the image surface) is stored in the lens control board 13.

  Then, the user (user) inputs an amount of curvature of field (for example, a radius of curvature in a spherical screen) using the remote controller 100. The input value input by the remote controller 100 is received by the lens control board 13 by wireless communication. The lens control board 13 moves the field curvature adjustment group 1 to the target position from the input value of the user and previously stored information. The focus adjustment group 2 is moved to suppress a change in the focus state. As described above, also in the present embodiment, it is possible to easily fit the projection image to the spherical screen by curving the image plane without performing the measurement on the spherical screen.

<< Third Embodiment >>
The present embodiment has a third optical system that changes the magnification by moving in the optical axis direction, and the lens control board 13 as the control unit changes the magnification when moving the first optical system 1 to the target position. The third optical system is moved in the direction of the optical axis so as to suppress this. Other points are the same as those in the first embodiment, and a description thereof will be omitted.

  In the present embodiment, the position of the zoom adjustment group 3 as the third optical system, the position of the field curvature adjustment group 1 as the first optical system in the optical axis direction, and the amount of field curvature with respect thereto (For example, the curvature radius of the changed curved surface of the image surface) is stored in the lens control board 13.

  Then, the user (user) inputs an amount of curvature of field (for example, a radius of curvature in a spherical screen) using the remote controller 100. The input value input by the remote controller 100 is received by the lens control board 13 by wireless communication. The lens control board 13 moves the field curvature adjustment group 1 to the target position from the input value of the user and previously stored information. Then, the zoom adjustment group 3 is moved to suppress the change in magnification. As described above, also in the present embodiment, it is possible to easily fit the projection image to the spherical screen by curving the image plane without performing the measurement on the spherical screen.

  In addition, it can also be set as the form implemented combining 2nd Embodiment and this embodiment.

<< Fourth Embodiment >>
This embodiment suppresses the change in brightness in the image plane due to the change in the distance in the optical axis direction between the front and back of the spherical screen (peripheral part and central part) by adjusting the curvature of field. It is characterized by. Other points are the same as those in the first embodiment, and a description thereof will be omitted.

  In FIG. 1A, when the projection image 14 is changed from 14a to 14b, the relative distance in the direction of the optical axis 15 is different between the front and back (periphery and center of the screen) when viewed from the lens device 20. The closer to the lens device 20, the brighter it becomes. That is, the screen outer peripheral circle on the front side becomes brighter on the screen having a shape like 14b.

  Therefore, in the present embodiment, the lens control board is used to calculate the brightness fluctuation amount (brightness difference between the peripheral portion and the central portion of the screen) depending on the position of the field curvature adjustment group 1 in the optical axis direction and the location on the projection surface in advance. 13 is stored. When the field curvature adjustment group 1 is moved to the target position, the previously stored brightness fluctuation amount (brightness difference between the peripheral portion and the central portion of the screen) is canceled (or suppressed). Specifically, the distribution of brightness in the image created by the reflective liquid crystal panel 30 is adjusted by the lens control board 13 as a control unit. Thereby, in this embodiment, the brightness nonuniformity at the time of adjusting a field curvature can be eliminated automatically.

  Here, as an illuminance changing unit for suppressing brightness unevenness when adjusting the curvature of field, the liquid crystal panel 30 as an image generating unit for generating an image, a diaphragm provided in the lens device, and the liquid crystal panel 30 are illuminated. A stop provided in the optical path of the illumination light from the light source to be used may be used.

  In addition, brightness unevenness when the curvature of field is adjusted may be suppressed by adding other position information such as the position information of the lens shift unit 21, the focus position, and the zoom position.

<< Fifth Embodiment >>
The present embodiment is characterized in that the back focus shifts due to the adjustment of the field curvature, and the focus is prevented from being out of focus when the zoom operation is performed. Other points are the same as those in the first embodiment, and a description thereof will be omitted.

  In FIG. 1A, when the field curvature adjustment group 1 is moved in the optical axis direction and the projected image 14 is changed, the lens having the refractive index is moved, so that the back focus is changed. Therefore, in this embodiment. The variation amount of the back focus with respect to the movement amount of the field curvature adjustment group 1 is optically obtained, and an amount for canceling the variation amount of the back focus is stored in the lens control board 13. In order to reflect individual differences such as component tolerance and manufacturing error, the lens control board 13 may store an amount for canceling the back focus variation amount with respect to the field curvature adjustment group 1 in the manufacturing process.

  When the field curvature adjustment is performed, the adjustment amount is detected by the position detection sensor 7 of the field curvature adjustment group. Then, an amount for canceling the back focus fluctuation amount with respect to the adjustment amount of the field curvature group 1 stored in advance in the lens control board 13 is obtained. Then, the lens expansion / contraction pin 46 (FIGS. 5 and 7) as the distance changing unit is expanded / contracted by rotating the lens expansion / contraction pin motor 74 (FIG. 7) by the calculated correction amount. In this way, the back focus can be corrected by changing the distance between the lens 20 and the liquid crystal panel 30 as shown in FIG.

  As a result, in this embodiment, since the back focus shift is eliminated, it is possible to provide an image projection apparatus in which no focus shift occurs in the entire zoom range even after the field curvature adjustment.

<< Sixth Embodiment >>
In the present embodiment, a focus shift associated with a zoom operation when the field curvature adjustment group 1 is moved in the optical axis direction is suppressed. Other points are the same as those in the first embodiment, and a description thereof will be omitted.

  As described in the fifth embodiment, when the projected image 14 is changed by moving the field curvature adjustment group 1 in the optical axis direction in FIG. 1A, the lens having a refractive index moves. The back focus fluctuates. If the back focus fluctuates, the projected image will be out of focus when zoomed.

  In this embodiment, when the field curvature adjustment group 1 is moved by a predetermined amount, the position in the optical axis direction of the focus adjustment group 2 that prevents a focus shift (focus position fluctuation) at a predetermined zoom position is optical. Is required. Then, the correction amount of the focus adjustment group 2 corresponding to the focus position fluctuation is stored in the lens control board 13. In order to reflect individual differences such as component tolerances and manufacturing errors, the correction amount of the focus adjustment group 2 may be stored in the lens control board 13 in the manufacturing process.

  When the field curvature adjustment is performed, the adjustment amount is detected by the position detection sensor 7 of the field curvature adjustment group. Then, the position of the zoom adjustment group 3 is detected by the zoom adjustment position detection end detection sensor 12. From the information stored in the lens control board 13 in advance and the detection result, the correction amount of the focus adjustment group 2 is obtained. The focus adjustment group 2 is moved by the focus adjustment motor 9 by the obtained correction amount. In this way, it is possible to provide an image projection apparatus that does not cause out-of-focus in the entire zoom range even after the field curvature adjustment.

<< Seventh Embodiment >>
In the present embodiment, the lens device 20 can be adjusted for lens shift and tilt. Since other points are the same as in any of the above-described embodiments, at least a part of the description will be omitted.

  FIGS. 11A and 12A are diagrams showing the relationship between the lens device 20 and the focus surface 14 when the lens shift is not performed, and the focus surface is obtained by adjusting the field curvature as described above. Is a curved focus surface 14b. In FIG. 12A, the entire dome-shaped focus surface is shown, but in FIGS. 12B and 12C, only a part of the focus surface (projection of the focus surface that is actually projected on the screen). A portion corresponding to an image) is shown.

  Here, in the driving simulator 11 as shown in FIG. 4 to be described later, the projector may be installed by being rotated 90 degrees from the normal installation posture. FIGS. 11B and 12B show the lens device 20 and the focus surface when the projection image is rotated 90 degrees by rotating the projector 90 degrees from the state shown in FIGS. 11A and 12A. It is a figure which shows the relationship with 14b. Some projection lenses for projectors can be lens-shifted, and FIGS. 11C and 12C show the relationship between the lens device 20 and the focus surface 14c when the lens device 20 is shifted. It is a figure which shows a relationship. In this case, a portion different from FIGS. 11B and 12B is cut out from the focus surface 14b shown in FIG. 12A, so that a focus surface 14c different from the focus surface 14b is obtained. When the lens shift is performed as shown in FIG. 11C, the focus surface 14c and the dome-shaped screen SC can be matched with each other as shown in FIG. And the center of the projected image or the center of the focus plane will deviate. Therefore, as shown in FIGS. 11D and 13B, by tilting the lens device 20, the shape of the screen SC and the shape of the focus surface 14c are matched, and the center of the screen SC and the center of the projection image are matched. Can be combined.

  14A and 14B are diagrams showing a case where the lens device 20 is tilted with respect to the optical axis 200 of the illumination optical system. As described with reference to FIG. 6 and the like, the lens device 20 can be moved in the direction perpendicular to the optical axis by the lens shift unit 21. That is, the lens shift unit 21 holds the lens device 20 so that the lens device 20 can be moved in a direction (Y direction and Z direction in FIG. 14) orthogonal to the optical axis.

  14A and 14B, 43 is a combining prism, 30 is a liquid crystal panel, 45 is a color combining unit that holds the combining prism 43 and the liquid crystal panel 30, and a color combining unit. 45 is fixed to the lens shift unit 21.

  In FIG. 5 described above, the telescopic pin 46 is provided between the lens device 20 and the lens unit unit 21, but in the present embodiment, an inclined pin 460 is provided. In addition, the expansion / contraction pin 46 may have the function as the inclination pin 460, and the inclination pin 460 may also have the function as the expansion / contraction pin 46. That is, one type of pin may have the functions as the telescopic pin 46 and the inclined pin 460.

  As shown in FIGS. 14A and 14B, the tilt pin 460 expands and contracts, whereby the lens device 20 can be tilted with respect to the optical axis 200 of the illumination optical system. Can be realized. The lens tilt mechanism using the tilt pin 460 may adopt the same configuration as that of FIG. That is, in FIG. 7 described above, the telescopic pin 46 may be the tilt pin 460 and a lens tilt pin motor may be used instead of the lens telescopic pin motor 74. In FIG. 7, 20a is a part of the lens device 20, 73 is a spring, and 42a is a lens mounting portion.

  The distance between the lens device 20 and the lens mounting portion can be changed by driving the lens tilt pin motor. As a result, for example, in FIG. 14A, the inclined pin 460 on the upper side of the paper surface is extended, and conversely, the inclined pin 460 on the lower side of the paper surface is contracted or not extended, as shown in FIG. The lens device 20 can be tilted downward in the drawing. The lens tilt pin motor may include a sensor that detects the amount of expansion / contraction of the tilt pin 460.

  FIG. 15A is a diagram illustrating an example of the driving simulator 110. The driving simulator 110 is a system that projects an image on the curved screen 700 with a plurality of projectors 8, detects the operation of the operator 800, and changes the image of the projector 8. At that time, the environment of the operator 800 may also change by detecting the operation, for example, the entire driving simulator 110 may tilt or vibrate.

  In such a simulator, for example, the curved screen 700 is placed on the extension line of the line of sight 90 of the operator 800. Although it is sufficient if the projector 8 can be installed at the eye position of the operator 10, the projector 8 cannot be normally installed. Therefore, as shown in FIG. 15A, the projector 8 is attached to the ceiling, for example, and the lens is directed downward in FIG. The projected image is not blocked by the operator 10 by shifting.

  FIG. 15B is a diagram showing a state in which a total of seven projectors 8 are used, and the curved screen 700 is divided into regions 14c1 to 14c7 and an image is displayed on the curved screen 700. In FIG. 15 (b), each projector 8 intentionally generates curvature of field, and the focused surface in a state where the lens shift as shown in FIG. 15 (a) is performed is shown in FIG. 11 (d) and FIG. As shown in (a) and (b), the lens apparatus 20 is tilted to fit the curved screen 700. In order to intentionally generate the field curvature, the field curvature adjustment group 1 shown in FIG. 1A is operated by operating the field curvature adjustment grip 10 shown in FIG. Move to.

  Here, the degree of curvature of field (for example, the radius of curvature) can be obtained by calculation according to the position of the field curvature adjustment group 1. Further, which region of the focus surface 14 in FIG. 12A is cut out as the focus surface of the projection image by lens shift can be calculated by the YZ plane coordinate position of the lens shift unit 21.

  As described in FIG. 1B, the position of the field curvature adjustment group 1 can be obtained by the position detection sensor 7 for the field curvature group. Further, the position of the YZ plane coordinates of the lens shift unit 21 can be obtained by the Z direction position detection sensor 58 and the Y direction position detection sensor 61 as described in FIG.

  The lens control board 27 has a surface (for example, FIG. 11C) cut out as a focus surface of the projected image from information of the position detection sensor 7 for the field curvature group, the Y direction position detection sensor 61, and the Z direction position detection sensor 58. Stores information that can be calculated. The lens control board 27 provides information that can calculate the amount of tilting of the lens device 20 (for example, FIG. 11D) in order to bring the calculated focus surface (for example, FIG. 11C) closer to a state where the lens shift is not performed. Remember.

  In order to bring the surface cut out as the focus surface of the projected image closer to the state where the lens shift is not performed, it is preferable to reduce the difference in the positions of the four corners of the screen in the optical axis direction in FIG. In order to realize the calculated tilt amount of the lens device 20, the lens device 20 is tilted by driving an arbitrary amount of a total of four lens tilt pin motors.

  By performing the control described above, it is possible to provide a projection display device that can adjust the curvature of field and accurately fit the focus surface to the curved screen even when the lens shift is performed.

  In order to calculate the tilt amount of the lens device 20 more strictly, it is desirable to take into account the tolerances of components and assembly errors at the factory.

  Therefore, the degree of field curvature relative to the detection position of the position detection sensor 7 for the field curvature group may be measured in the manufacturing process and stored in the lens control board. Further, an area to be cut out as a focus surface of the projection image with respect to the detection positions of the Z direction position detection sensor 58 and the Y direction position detection sensor 61 may be measured in the manufacturing process and stored in the lens control board. From these pieces of information, in order to realize the tilt amount of the lens device 20 calculated as described above, the lens device 20 is tilted by driving an arbitrary amount of the lens tilt pin motors in total of four locations as described above.

  The tilt amount storage unit that stores the adjustment amount of the lens tilt pin may store the adjustment amount, or stores information for calculating the adjustment amount, and stores the detected value and the stored information. The adjustment amount may be calculated from

  Further, in the present embodiment, the configuration including the lens tilt pin and the lens tilt pin motor as the lens tilt portion is illustrated, but the configuration of the lens tilt portion is not limited to such a configuration. In the present embodiment, the configuration in which the lens control board also has a function as the tilt amount storage unit is illustrated, but a configuration having an tilt amount storage unit separately from the lens control board may be used.

(Modification)
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

(Modification 1)
In the embodiment described above, the amount of curvature of field is determined by the curvature radius of the screen, but the distance (interval) in the optical axis direction between the back and front of the screen (center and periphery) may be input. The input condition is not particularly limited as long as the degree of surface curvature can be defined.

(Modification 2)
In the embodiment described above, the spherical screen is concave on the image projection apparatus side, but is not limited thereto, and may be convex on the image projection apparatus side.

(Modification 3)
In the embodiment described above, the storage unit (provided in the lens control board 13) and the input unit (remote controller 100) are provided in the lens device. However, both or one of them is provided in the lens device as a component configured as an image projection device. It is not necessary.

(Modification 4)
In the above-described embodiment, the lens apparatus 20 as the projection optical system held by the lens holding member (holding member) has been described as being fixed to the image projection apparatus main body. Alternatively, it may be provided so as to be detachable.

1 Field curvature adjustment group 13 Lens control board

Claims (15)

A first optical system that changes curvature of field by movement in the optical axis direction;
The relationship between the position of the first optical system in the optical axis direction and the amount of field curvature is stored in advance, and is specified based on a predetermined amount input as the amount of field curvature. A controller that moves the first optical system to a target position in the optical axis direction;
A position detector that detects a reference position of the first optical system in the optical axis direction;
A movement amount detector that detects a movement amount of the first optical system in the optical axis direction from the reference position to the target position;
A lens device comprising:   The lens apparatus according to claim 1, further comprising a storage unit that stores a relationship between a position of the first optical system in the optical axis direction and the amount of curvature of field. A second optical system that changes a focus state by movement in the optical axis direction;
The control unit moves the second optical system in the optical axis direction so as to suppress a change in a focus state when the first optical system is moved to the target position. Or the lens apparatus of 2. Having a third optical system for changing the magnification by movement in the optical axis direction;
The control unit moves the third optical system in the optical axis direction so as to suppress a change in magnification when the first optical system is moved to the target position. The lens device according to any one of the above.   In the image plane specified based on the target position in a state in which the relationship between the position of the first optical system in the optical axis direction and the illuminance unevenness in the image plane is stored in advance. 5. The lens device according to claim 1, wherein an illuminance changing unit that changes the illuminance in the image plane is controlled so as to suppress the illuminance unevenness of the lens. Image generating means for generating an image;
A holding member that holds the lens device according to any one of claims 1 to 5,
An image projection apparatus comprising:   The image projection apparatus according to claim 6, further comprising a storage unit that stores a relationship between a position of the first optical system in the optical axis direction and the amount of curvature of field. In a state where the relationship between the position of the first optical system in the optical axis direction and the illuminance unevenness in the image plane is stored in advance, the illuminance unevenness in the image plane specified based on the target position is suppressed. As described above, it has an illuminance changing unit that changes the illuminance in the image plane,
The illuminance changing unit is provided in an optical path of illumination light from an aperture provided in the lens device according to any one of claims 1 to 5, an image generation unit that generates an image, and a light source that illuminates the image generation unit. The image projection apparatus according to claim 6, wherein the image projection apparatus is an aperture. A distance changing unit for changing a distance in the optical axis direction between the lens device and the image generating unit;
In a state where the relationship between the position of the first optical system and the back focus variation is stored,
9. The image projection according to claim 6, wherein the control unit controls the distance changing unit so as to reduce a variation in the back focus specified based on the target position. 10. apparatus. A second optical system that changes a focus state by movement in the optical axis direction;
The controller is
The movement of the second optical system is controlled so as to reduce the focus position fluctuation specified based on the target position in a state where the relationship between the position of the first optical system and the focus position fluctuation is stored. The image projection apparatus according to claim 6, wherein the image projection apparatus is an image projection apparatus. A lens shift unit capable of moving the lens device according to any one of claims 1 to 5 in a direction perpendicular to the optical axis direction;
A shift position detection unit for detecting the position of the lens shift unit;
A lens tilting unit capable of tilting the lens device with respect to the image generating unit;
A tilt amount storage unit for storing an adjustment amount of the lens tilt unit at a predetermined position of the lens shift unit and the position of the first optical system;
The control unit determines the lens tilting unit from the detection result by the position detection unit and the movement amount detection unit, the detection result by the lens shift position detection unit, and the adjustment amount stored in the tilt amount storage unit. The image projection apparatus according to claim 6, wherein the image projection apparatus is driven.   The adjustment amount is an adjustment amount such that the tilt amount storage unit reduces the difference in the focal position in the optical axis direction at the four corners of the projection screen at the predetermined position of the lens shift unit and the position of the first optical system. The image projection apparatus according to claim 11.   The image projection device according to claim 11, wherein the tilt amount storage unit is provided in the lens device.   The tilt amount storage unit stores information capable of calculating the tilt amount of the lens tilting unit from information on the position of the first optical system and the position of the lens shift unit. The image projection device according to any one of claims 11 to 13. A first optical system that changes curvature of field by movement in the optical axis direction;
The relationship between the position of the first optical system in the optical axis direction and the amount of field curvature is stored in advance, and is specified based on a predetermined amount input as the amount of field curvature. A controller that moves the first optical system to a target position in the optical axis direction;
A lens apparatus comprising: an absolute encoder that detects a position of the first optical system in the optical axis direction.

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