WO2020261851A1

WO2020261851A1 - Projection device

Info

Publication number: WO2020261851A1
Application number: PCT/JP2020/020909
Authority: WO
Inventors: 林　健吉; 和紀井上; 伊藤　研治; 米山　一也
Original assignee: 富士フイルム株式会社
Priority date: 2019-06-28
Filing date: 2020-05-27
Publication date: 2020-12-30

Abstract

Provided is a projection device that can capture the entire projection image and can be useful for controlling the projection image.　A projector (100) comprises an imaging element (38) that captures an image of a screen SC through a portion of an optical system that projects an image from a display unit onto the screen SC. The imaging element (38) has a light reception surface (38a) in which a plurality of pixels are arranged two-dimensionally. In a state in which the image projected on the screen SC is formed at a position of the light reception surface (38a) by a portion of the optical system, when the image is set as a projected capture image g1, the width of the projected capture image g1 in a direction Y is set as L1, and the width of the light reception surface (38a) in the direction Y is set as D1, the relationship L1<D1 is satisfied. Furthermore, when the distance between the center position of the projected capture image g1 in the direction Y and the center position of the light reception surface (38a) in the direction Y is set as B1, the relationship (0)<B1≤(D1-L1)×(0).5 is satisfied.

Description

Projection device

The present invention relates to a projection device.

A system that combines an imaging device and a projection device has been proposed. For example, Patent Document 1 describes a digital camera with a built-in projector. This digital camera with a built-in projector has an imaging angle of view adjustment function that makes the imaging area slightly larger than the projection area and makes the imaging area equal to or slightly smaller than the projection area.

In a system that combines an image pickup device and a projection device, the optical path of the projected image and the optical path of the subject light from the projected image received by the image sensor partially overlap as in

Patent Documents

2 and 3. The composition is known. Patent Document 2 describes that the imaging region is wider than the image projection region. In Patent Document 3, a light-shielding portion is provided in the imaging unit, and when the projection range is narrowed, the imaging range is narrowed by the light-shielding portion to prevent light incident from other than the projection range from entering the imaging unit. Is described.

Japanese Patent Application Laid-Open No. 2012-027302 Japanese Patent Application Laid-Open No. 2017-201380 Japanese Patent Application Laid-Open No. 2011-186704

One embodiment according to the technique of the present disclosure provides a projection device capable of capturing the entire projected image and being useful for controlling the projected image or the like.

The projection device of the present invention includes an optical system that projects an image from a display unit onto a projection object, and an image pickup element that images the projection object through a part of the optical system. The image of the above has a light receiving surface arranged in a two-dimensional shape in the first direction and the second direction in which the first direction intersects, and the image projected on the projection object is the part of the optical system. The image in the state of being imaged at the position of the light receiving surface was defined as a projected image, the width of the projected image in the first direction was defined as L1, and the width of the light receiving surface in the first direction was defined as D1. In this case, the relationship L1 <D1 is established, and further, the first position of the projected image in the first direction and the light receiving surface in the first direction having the same positional relationship as the first position in the projected image. When the distance from the second position of is B1, the relationship of 0 <B1 ≦ (D1-L1) × 0.5 is established.

According to the present invention, it is possible to provide a projection device capable of capturing the entire projected image and being useful for controlling the projected image.

It is a schematic diagram which shows the appearance structure of the projector 100 which is one Embodiment of the projection apparatus of this invention. It is a schematic diagram which shows an example of the internal structure of the light source unit 11 of FIG. It is sectional drawing of the optical unit 6 of the projector 100 shown in FIG. FIG. 3 is a schematic view of the lens 34 of the optical unit 6 in the reference rotation state shown in FIG. 3 as viewed from the screen SC side. It is a schematic diagram for demonstrating the relationship between the image displayed by a display part, and the image projected on a screen. It is a schematic diagram which shows the image which image | formed on the image sensor 38 in each rotation state shown in FIG. It is a schematic diagram which looked at the display surface of the light modulation element 12a in the direction X2. FIG. 5 is a diagram corresponding to FIG. 5 showing an example in which the projection optical system of the optical unit 6 and the light modulation element 12a are designed so that the center of the projected image G1 and the optical axis K coincide with each other. FIG. 5 is a schematic view showing a state in which the projected image G1 in the reference rotation state shown in FIG. 8 is formed on the light receiving surface 38a.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view showing an external configuration of a projector 100, which is an embodiment of the projection device of the present invention. FIG. 2 is a schematic view showing an example of the internal configuration of the light source unit 11 of FIG. FIG. 3 is a schematic cross-sectional view of the optical unit 6 of the projector 100 shown in FIG. FIG. 3 shows a cross section of the light emitted from the main body 1 along the optical path.

As shown in FIG. 1, the projector 100 includes a main body portion 1 and an optical unit 6 provided so as to project from the main body portion 1. The optical unit 6 includes a first member 2 supported by the main body 1 and a second member 3 rotatably supported by the first member 2. The optical unit 6 may be detachably configured (in other words, interchangeable) in the main body 1.

The main body 1 has a housing 15 (see FIG. 3) in which an opening 15a (see FIG. 3) for passing light is formed in a portion connected to the optical unit 6.

As shown in FIG. 1, inside the housing 15 of the main body 1, the light source unit 11 and the light modulation element that spatially modulates the light emitted from the light source unit 11 based on the input image data to generate an image. An optical modulation unit 12 including 12a (see FIG. 2) is provided. The display unit is composed of the light source unit 11 and the light modulation unit 12.

In the example shown in FIG. 2, the light source unit 11 includes a light source 41 that emits white light, a color wheel 42, and an illumination optical system 43. The light source 41 is configured to include a light emitting element such as a laser or an LED (Light Emitting Diode). The color wheel 42 is arranged between the light source 41 and the illumination optical system 43. The color wheel 42 is a disk-shaped member, and an R filter that transmits red light, a G filter that transmits green light, and a B filter that transmits blue light are provided along the circumferential direction thereof. The color wheel 42 is rotated about an axis, and the white light emitted from the light source 41 is separated into red light, green light, and blue light in a time-divided manner and guided to the illumination optical system 43. The light emitted from the illumination optical system 43 is incident on the light modulation element 12a.

As the light modulation element 12a included in the light modulation unit 12, a DMD (Digital Micromirror Device) is used, for example, in the case of the configuration of the light source unit 11 of FIG. As the light modulation element 12a, an LCOS (Liquid crystal on silicon) element, a MEMS (Micro Electro Mechanical Systems) element, a liquid crystal display element, or the like can also be used. As shown in FIG. 3, the image formed by the light spatially modulated by the optical modulation unit 12 (display image of the display unit) passes through the opening 15a of the housing 15 and is incident on the optical unit 6 to be projected. It is projected onto the screen SC as an object, and the projected image G1 becomes visible to the observer.

The light modulation element 12a has a configuration in which display pixels for forming one pixel of the projected image G1 have a display surface arranged in a two-dimensional manner.

As shown in FIG. 3, the optical unit 6 includes a first member 2 having a hollow portion 2A connected to the inside of the main body portion 1, a second member 3 having a hollow portion 3A connected to the hollow portion 2A, and a hollow portion 2A. The first optical system 21 and the reflecting member 22 arranged, and the second optical system 31, the branch member 32, the third optical system 33, the fourth optical system 37, the image sensor 38, and the lens 34 arranged in the hollow portion 3A. And a rotation mechanism 4.

The first member 2 is a member having a rectangular cross-sectional outer shape, and the

openings

2a and 2b are formed on surfaces perpendicular to each other. The first member 2 is supported by the main body 1 in a state where the opening 2a is arranged at a position facing the opening 15a of the main body 1. The light emitted from the light modulation element 12a of the light modulation unit 12 of the main body 1 passes through the

openings

15a and 2a and is incident on the hollow portion 2A of the first member 2.

The incident direction of the light incident on the hollow portion 2A from the main body portion 1 is described as the direction X1, the opposite direction of the direction X1 is described as the direction X2, and the direction X1 and the direction X2 are collectively referred to as the direction X. Further, in FIG. 3, the direction from the front to the back of the paper and the opposite direction are described as the direction Z. Of the directions Z, the direction from the front to the back of the paper is described as the direction Z1, and the direction from the back to the front of the paper is described as the direction Z2. Further, the direction perpendicular to the direction X and the direction Z is described as the direction Y, and among the directions Y, the upward direction in FIG. 3 is described as the direction Y1, and the downward direction in FIG. 3 is described as the direction Y2. .. In the example of FIG. 3, the projector 100 is arranged so that the direction Y2 is the vertical direction. In the present specification, the direction Y constitutes the first direction.

The first optical system 21, the reflective member 22, the second optical system 31, the branch member 32, the third optical system 33, and the lens 34 are optical systems for projecting the image formed by the light modulation element 12a onto the screen SC. It constitutes (hereinafter referred to as a projection optical system). FIG. 3 shows the optical axis K of this projection optical system. The first optical system 21, the reflective member 22, the second optical system 31, the branch member 32, the third optical system 33, and the lens 34 are arranged along the optical axis K in this order from the light modulation element 12a side. In the example of FIG. 3, the light modulation element 12a is eccentrically arranged on the direction Y2 side with respect to the optical axis K. In other words, the center of the image formed by the light modulation element 12a (the center of the display surface 12A described later) does not coincide with the optical axis K and is located on the direction Y2 side of the optical axis K.

The first optical system 21 includes at least one lens, and guides light traveling from the main body 1 to the first member 2 in the direction X1 to the reflecting member 22.

The reflecting member 22 reflects the light incident from the first optical system 21 in the direction Y1. The reflective member 22 is composed of, for example, a mirror or the like. The first member 2 has an opening 2b formed on the optical path of the light reflected by the reflecting member 22, and the reflected light passes through the opening 2b and proceeds to the hollow portion 3A of the second member 3.

The second member 3 is a member having a substantially T-shaped cross section, and an opening 3a is formed at a position facing the opening 2b of the first member 2. The light from the main body 1 that has passed through the opening 2b of the first member 2 is incident on the hollow portion 3A of the second member 3 through the opening 3a. The cross-sectional outer shape of the first member 2 and the second member 3 is arbitrary and is not limited to those described above.

The second optical system 31 includes at least one lens, and guides the light incident from the first member 2 to the branch member 32.

The branch member 32 reflects the light incident from the second optical system 31 in the direction X2 and guides it to the third optical system 33. Further, the branch member 32 transmits the subject light incident on the lens 34 from the screen SC side and traveling in the direction X1 passing through the third optical system 33, and guides the subject light to the fourth optical system 37. The branch member 32 is composed of a member having a certain thickness, for example, a half mirror or a polarizing plate.

The third optical system 33 includes at least one lens, and guides the light reflected by the branch member 32 to the lens 34.

The lens 34 is arranged at this end so as to close the opening 3c formed at the end of the second member 3 on the direction X2 side. The lens 34 projects the light incident from the third optical system 33 onto the screen SC.

The fourth optical system 37 includes at least one lens and is arranged next to the branch member 32 on the direction X1 side, and guides the subject light that passes through the branch member 32 and travels in the direction X1 to the image sensor 38. The optical axis of the fourth optical system 37 coincides with the optical axis of the lens 34 and the third optical system 33. The fourth optical system 37 includes a lens having a variable focal length. The fourth optical system 37 constitutes an imaging optical system. The fourth optical system 37 does not have to include a lens having a variable focal length.

The image sensor 38 is a CCD (Charge Coupled Device) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or the like. The image sensor 38 images the screen SC through the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37. The lens 34, the third optical system 33, and the branch member 32 form a part of the projection optical system.

The rotation mechanism 4 is a mechanism for rotatably connecting the second member 3 to the first member 2. By this rotation mechanism 4, the second member 3 is rotatably configured around a rotation axis (specifically, an optical axis K) extending in the direction Y. That is, the rotation mechanism 4 makes it possible to partially rotate the projection optical system in the optical unit 6.

Specifically, the rotation mechanism 4 causes the second member 3 to be rotated by 90 degrees from the reference rotation state (hereinafter referred to as the reference rotation state) and the rotation state (hereinafter, referred to as the reference rotation state) shown in FIG. A left rotation state), a rotation state rotated 90 degrees to the back side of the paper surface from the reference rotation state (hereinafter referred to as a right rotation state), and a rotation state rotated 180 degrees from the reference rotation state (hereinafter referred to as a 180 degree rotation state). It can take four rotation states. Regardless of which of the four rotational states the second member 3 is in, the screen SC is provided at a position facing the lens 34 and is used. The rotation mechanism 4 may be one that manually rotates the second member 3 or one that electrically rotates the second member 3. In the present specification, the reference rotation state and the 180 degree rotation state each constitute the first state. Further, the counterclockwise rotation state constitutes the second state, and the clockwise rotation state constitutes the third state. The rotation mechanism 4 is not limited to the arrangement position shown in FIG. 3, as long as the projection optical system can be rotated. Further, the number of rotation mechanisms is not limited to one, and a plurality of rotation mechanisms may be provided.

FIG. 4 is a schematic view of the lens 34 of the optical unit 6 in the reference rotation state shown in FIG. 3 as viewed from the screen SC side. FIG. 4 shows a straight line l2 that passes through the optical axis K and extends in the direction Y, and a straight line l1 that passes through the optical axis K and extends in the direction Z.

As shown in FIG. 4, the lens 34 can be divided into four regions, region 34A, region 34B, region 34C, and region 34D, by the straight line l1 and the straight line l2. In the projector 100, the images generated by the light modulation elements 12a can be ejected from different regions of the lens 34 and projected toward the screen SC according to the rotational state of the second member 3 by the rotation mechanism 4. The projection optical system and the light modulation element 12a have been designed.

Specifically, the first projection mode in which the image is projected from the

areas

34A and 34D shown in FIG. 4 toward the screen SC, and the first projection mode in which the image is projected from the

areas

34A and 34B shown in FIG. 4 toward the screen SC. It is possible to switch between the two projection modes and the third projection mode in which an image is projected from the

areas

34C and 34D shown in FIG. 4 toward the screen SC.

More specifically, when the rotation state of the second member 3 is the reference rotation state and the rotation state of 180 degrees, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction X. In this state, the image is projected in the first projection mode.

When the rotation state of the second member 3 is a clockwise rotation state, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction Z, and the lens 34 is the branch member 32. When the lens is located closer to the direction Z1, the image is projected in the second projection mode.

Further, when the rotation state of the second member 3 is the left rotation state, in other words, the portion of the optical axis K between the branch member 32 and the lens 34 extends in the direction Z, and the lens 34 is the branch member 32. When the lens is located closer to the direction Z2, the image is projected in the third projection mode.

The lens 34, the third optical system 33, the branch member 32, the fourth optical system 37, and the image sensor 38 rotate integrally with the rotation of the second member 3. Therefore, in the following, of the directions perpendicular to the direction Y and the optical axis K when the lens 34 is viewed from the screen SC side, one side (left side) is described as the direction Z3, and the other side (right side) is described as the direction Z4. To specify the direction of the internal components of the second member 3. That is, in the example of FIG. 4, the direction Z1 is read as the direction Z3, and the direction Z2 is read as the direction Z4. Direction Z3 and direction Z4 are collectively referred to as direction ZZ, and direction ZZ constitutes the second direction.

FIG. 5 is a schematic diagram for explaining the relationship between the image displayed by the display unit and the image projected on the screen. In FIG. 5, the image d1 generated by the light modulation element 12a in a state where the display surface 12A of the light modulation element 12a is viewed from the opening 15a side in the direction X2 is shown at the uppermost part. The image d1 shows an image of the maximum size that can be projected on the screen SC by the projector 100, in other words, corresponds to a screen on which the image can be displayed. In FIG. 5, an L-shaped mark is attached to the upper left corner of the image d1, and this mark is for facilitating the recognition of the orientation of the image d1 and is actually projected on the screen SC. is not. In the image d1 shown in FIG. 5, the right side in the figure is the direction Z1 side, the left side in the figure is the direction Z2 side, the upper side in the figure is the direction Y1 side, and the lower side in the figure is the direction Y2 side.

FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the reference rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.

FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the counterclockwise rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.

FIG. 5 shows a projected image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in the clockwise rotation state, and an image pickup range IM of the image sensor 38 in the screen SC. It is shown.

In the imaging range IM, the position of the projected image G1 in the left rotation state and the position of the projected image G1 in the right rotation state have a line-symmetrical relationship with respect to a straight line passing through the optical axis K and extending in the direction Y. Further, the projected image G1 in the left rotation state and the projected image G1 in the right rotation state have a point-symmetrical relationship with respect to the optical axis K.

Further, FIG. 5 shows an image G1 of the image d1 projected on the screen SC when the screen SC is viewed from the side opposite to the lens 34 side in a 180-degree rotation state, and an image sensor 38 on the screen SC. The range IM is shown.

In the imaging range IM, the position of the projected image G1 in the 180-degree rotation state coincides with the position of the projected image G1 in the reference projection state. Further, the projected image G1 in the 180-degree rotation state is a 180-degree rotation of the projected image G1 in the reference rotation state as it is.

As described above, the positions of the projected image G1 can take three positions in the imaging range IM depending on the rotational state of the second member 3. Specifically, the position of the projected image G1 in the reference rotation state and the 180-degree rotation state is a position above the optical axis K in FIG. Further, the position of the projected image G1 in the left rotation state is a position on the left side of the optical axis K in FIG. Further, the position of the projected image G1 in the clockwise rotation state is the position on the right side of the optical axis K in FIG.

FIG. 6 is a schematic view showing an image formed on the image sensor 38 in each rotation state shown in FIG. FIG. 6 shows the light receiving surface 38a of the image sensor 38. Note that FIG. 6 shows a state in which the focal length of the fourth optical system 37 is maximum. Further, FIG. 6 shows a state in which the image sensor 38 is viewed from the fourth optical system 37 side (a state viewed from the front side).

The image sensor 38 has a light receiving surface 38a in which pixels are arranged two-dimensionally in a direction ZZ and a direction Y intersecting the direction ZZ (orthogonal in this embodiment). The light receiving surface 38a has a rectangular shape in which the direction Y is the lateral direction and the direction ZZ is the longitudinal direction. That is, assuming that the length of the light receiving surface 38a in the direction Y is D1 and the length of the light receiving surface 38a in the direction ZZ is D2, the relationship is D2> D1.

In FIG. 6, the image quality of the subject range formed by the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37 at the same position as the position of the light receiving surface 38a in the direction X is guaranteed. An imaging image circle PC in a range (a range in which distortion and aberration are sufficiently small) is shown. In the example of FIG. 6, the center of the imaging image circle PC coincides with the optical axis K, and the center of the optical axis K coincides with the center of the light receiving surface 38a.

Further, FIG. 6 shows a state in which the projected image G1 projected on the screen SC is imaged at the position of the light receiving surface 38a by the lens 34, the third optical system 33, the branch member 32, and the fourth optical system 37. The projected image g1 is shown as the image.

In this embodiment, the following relational expressions (A), (B), (C), (D), and (D) are used in each of the reference rotation state and the 180 degree rotation state in the state where the focal length of the fourth optical system 37 is maximum. The characteristics, arrangement, size, and the like of the projection optical system, the fourth optical system 37, the light modulation element 12a, and the image pickup element 38 are determined so that E) holds.

FIG. 7 is a schematic view of the display surface of the light modulation element 12a viewed in the direction X2. At the same position as the position of the direction X of the display surface 12A shown in FIG. 7, a display image circle DC, which is a range in which image quality is guaranteed (a range with less distortion and aberration) in the light focusing range of the projection optical system It is shown. In the example of FIG. 7, the center of the display surface 12A is eccentric to the direction Y2 with respect to the center of the display image circle DC.

In the following, the width of the direction Y of the projected image g1 is set to L1 in each of the reference rotation state and the 180 degree rotation state in the state where the focal length of the fourth optical system 37 is maximum, and the direction ZZ of the projected image g1. The width is L2, the distance between the center position of the projected image g1 in the direction Y and the center position of the light receiving surface 38a is B1, and the distance between the center position of the projected image g1 and the center position of the light receiving surface 38a in the direction ZZ is set. Let it be B2. Further, the distance between the center position of the direction ZZ of the projected image g1 in the counterclockwise rotation state and the center position of the direction ZZ of the projected image g1 in the clockwise rotation state is defined as S2.

(A) L1 <D1
(B) 0 <B1 ≦ (D1-L1) × 0.5
(C) B2 = 0
(D) L2 ≤ D1
(E) S2 + L1 ≦ D2

By satisfying the relational expressions (A) to (E), the projected image g1 can be imaged on the light receiving surface 38a without omission in any rotation state regardless of the focal length of the fourth optical system 37. it can.

The relational expression between (D) and (E) is for forming the projected image g1 in the light receiving surface 38a in both the left rotation state and the right rotation state.

In the relational expression (B), B1 is set to a value larger than 0 because there is a positional shift in the direction Y of the image that occurs when the image passes through the branch member 32. The image incident on the lens 34 from the screen SC side is slightly displaced in the direction Y due to the thickness of the branch member 32 when passing through the branch member 32.

Here, for example, it is assumed that the optical unit 6 is designed so that the center of the projected image G1 and the optical axis K coincide with each other. FIG. 8 is a diagram corresponding to FIG. 5 showing an example in which the projection optical system of the optical unit 6 and the light modulation element 12a are designed so that the center of the projected image G1 and the optical axis K coincide with each other. In order to realize the configuration shown in FIG. 8, for example, the center of the display image circle DC shown in FIG. 7 and the center of the display surface 12A are made to coincide with each other.

In this way, the optical axis K is either the case where the center of the projected image G1 and the optical axis K are aligned, or the case where the center of the projected image G1 and the optical axis K are not aligned as shown in FIG. Matching the center of the light receiving surface 38a with the center of the light receiving surface 38a has great manufacturing merits (such as being able to use existing manufacturing technology) and image processing merits (such as facilitating image correction based on optical characteristics). Therefore, it is preferable. In this way, when the projected image G1 in the reference rotation state and the 180 degree rotation state of FIG. 8 passes through the lens 34 and the branch member 32, the thickness of the branch member 32 causes the projected image G1 to actually pass. The projected image G1 is displaced in the direction Y and is imaged on the light receiving surface 38a.

FIG. 9 is a schematic view showing a state in which the projected image G1 in the reference rotation state shown in FIG. 8 is formed on the light receiving surface 38a. The projected image G1 shifts in the direction Y when passing through the branch member 32. Therefore, as shown in FIG. 9, the center of the projected image g1 is deviated from the center of the light receiving surface 38a toward the direction Y2 in the example of FIG. Even in this state, since the projected image G1 can be captured, no particular problem occurs.

In this embodiment, a part of the optical axis K (the optical axis of the lens 34 and the third optical system 33) and the center of the light receiving surface 38a are aligned with each other. In this configuration, even if the center of the projected image G1 and the optical axis K are aligned with each other, the center of the projected image g1 and the center of the light receiving surface 38a are deviated as shown in FIG. Therefore, the minimum value of B1 is a value (a value larger than 0) corresponding to the amount of image deviation caused by the thickness of the branch member 32. By allowing the minimum value of B1 to be larger than 0, the optical axis K and the center of the light receiving surface 38a can be aligned. Therefore, the projected image g1 can be imaged on the light receiving surface 38a without omission while enjoying the advantages in manufacturing and image processing.

As shown in FIG. 5, in the configuration in which the optical axis K and the center of the light receiving surface 38a are aligned and the distance between the center of the projected image G1 and the optical axis K is sufficiently large, the above B1 The value is inevitably greater than 0. In this case, by setting the upper limit value of B1 to (D1-L1) × 0.5, the projected image g1 can be completely applied to the light receiving surface 38a while enjoying the advantages in manufacturing and image processing. It can be imaged.

As described above, according to the projector 100, the optical unit 6 is configured so that the relational expressions (A) and (B) above are satisfied. Therefore, the optical axis K and the center of the light receiving surface 38a can be aligned with each other, and the projected image g1 can be imaged on the light receiving surface 38a without omission while enjoying the advantages in manufacturing and image processing. Can be done.

Further, according to the projector 100, the optical unit 6 is further configured so that the relational expressions (D) and (E) above are satisfied. Therefore, even when the projected image G1 is rotated, the projected image g1 can be imaged on the light receiving surface 38a without omission.

Further, according to the projector 100, the optical unit 6 is further configured so that the relational expression (C) above holds. The relational expression (C) defines the position of the direction ZZ of the projected image g1 in the reference rotation state and the 180 degree rotation state. By matching the center position of the projected image g1 in the direction ZZ in the reference rotation state and the 180 degree rotation state with the center position of the light receiving surface 38a, B2 = 0, that is, at a position close to the center of the image pickup image circle PC. The projected image g1 can be imaged. Therefore, the quality of the captured image can be improved. The misalignment of the image in the branch member 32 occurs in only one direction (direction Y in this embodiment). Therefore, the design in which B2 = 0 can be easily performed.

In the state where the focal length of the fourth optical system 37 is the minimum, the size of one pixel of the projected image g1 is preferably larger than the size of one pixel of the light receiving surface 38a. By doing so, one pixel of the projected image g1 can be imaged by one or more pixels of the image sensor 38, and high-resolution imaging becomes possible.

In order to make the size of one pixel of the projected image g1 larger than the size of one pixel of the light receiving surface 38a, the radius of the imaged image circle PC is R3, the radius of the display image circle DC is R1, and the light receiving surface 38a. When the pixel size is P3 and the display pixel size of the display surface 12A is P1, the focal length of the fourth optical system 37 is either maximum or minimum, and (P1 / P3) × (R3 /). R1) The relationship of ≧ 1 may be established.

The projector 100 can rotate a part of the projection optical system by the rotation mechanism 4, but the rotation mechanism 4 is not essential. For example, the rotation mechanism 4 may be deleted from the projector 100 so that the image can be projected only in the reference rotation state described above. In this case, as shown in FIG. 8, it is preferable to configure the projection optical system and the light modulation element 12a so that the center of the projected image G1 and the center of the optical axis K coincide with each other. Further, in this case, the optical unit 6 may be designed so that the above relational expressions (A), (B), and (C) and the relational expression L2 ≦ D2 are satisfied.

“B1” described in FIG. 6 is the distance between the center position of the projection image g1 in the direction Y and the center position of the light receiving surface 38a in the direction Y, but is not limited to this. This first from the distance from the end position of the direction Y1 of the projected image g1 to an arbitrary position (first position) and the position of the end of the direction Y2 of the projected image g1 in the reference rotation state and the 180 degree rotation state. The ratio to the distance to the position is defined as the first ratio. Further, the ratio of the distance from the position of the end of the direction Y1 of the light receiving surface 38a to an arbitrary position (second position) and the distance from the position of the end of the direction Y2 of the light receiving surface 38a to this second position is the second. The ratio. In this case, the first position and the second position may be the positions where the first ratio and the second ratio are the same, and the above "B1" may be replaced with the distance between the first position and the second position. The configuration in which the first ratio and the second ratio are 1: 1 respectively is the configuration shown in FIG.

Further, “S2” described with reference to FIG. 6 is the distance between the center position of the direction ZZ of the projected image g1 in the counterclockwise rotation state and the center position of the direction ZZ of the projected image g1 in the clockwise rotation state. Not limited to this.

In the counterclockwise rotation state, the distance from the end position of the direction Z3 of the projected image g1 to an arbitrary position (third position) and the distance from the end position of the direction Z4 of the projected image g1 to this third position. Let the ratio of be the third ratio. Further, in the clockwise rotation state, the distance from the position of the end of the direction Z3 of the projected image g1 to an arbitrary position (fourth position) and the position of the end of the direction Z4 of the projected image g1 to the fourth position. The ratio with the distance is defined as the fourth ratio. In this case, the third position and the fourth position may be the positions where the third ratio and the fourth ratio are the same, and the above "S2" may be replaced with the distance between the third position and the fourth position. The configuration in which the third ratio and the fourth ratio are 1: 1 respectively is the configuration shown in FIG.

Further, in the above description, as shown in FIG. 5 or 8, the rotation mechanism 4 rotates the projected image G1 in the reference rotation state by 90 degrees clockwise in the figure, or rotates the projection image G1 in the reference rotation state by 90 degrees. It is assumed that it can be rotated 90 degrees counterclockwise in the figure. The rotation angle of the projected image G1 when the projected image G1 is configured to be rotatable is not limited to 90 degrees, and any rotation angle can be adopted.

The optical unit 6 of the projector 100 simply uses the branch member 32 as a mirror, and reflects the light emitted from the lens 34 in front of the lens 34 and projects it onto the screen SC, and transmits the subject light from the screen SC. (A member similar to the branch member 32) may be arranged, and the fourth optical system 37 and the image pickup element 38 may be arranged on the optical path of the light transmitted through the optical member.

As explained above, the following matters are disclosed in this specification.

(1)
An optical system that projects an image from the display onto an object to be projected,
An image sensor that images the projection object through a part of the optical system is provided.
The image pickup device has a light receiving surface in which a plurality of pixels are two-dimensionally arranged in a first direction and a second direction in which the first direction intersects.
The image in a state where the image projected on the projection object is formed at the position of the light receiving surface by the part of the optical system is defined as a projection image, and the width of the projection image in the first direction. Is L1, and the width of the light receiving surface in the first direction is D1, the relationship of L1 <D1 is established.
Further, the distance between the first position of the projected image in the first direction and the second position of the light receiving surface in the first direction having the same positional relationship as the first position in the projected image is defined as B1. If you do
A projection device having a relationship of 0 <B1 ≦ (D1-L1) × 0.5.

(2)
(1) The projection device according to the above.
An image pickup optical system having a variable focal length arranged between the part of the optical system and the image sensor is provided.
A projection device in which the above relationship holds when the focal length of the imaging optical system is maximum.

(3)
The projection device according to (1) or (2).
A projection device in which the size of one pixel of the projected image is larger than the size of the pixel on the light receiving surface.

(4)
(3) The projection device according to the above.
The radius of the imaging image circle in the subject range imaged at the position of the light receiving surface by the part of the optical system is R3, and the light condensing range of the optical system at the position of the display unit. When the radius of the display image circle is R1, the size of the pixel on the light receiving surface is P3, and the size of the display pixel of the display unit is P1.
A projection device in which the relationship of (P1 / P3) × (R3 / R1) ≧ 1 holds.

(5)
The projection device according to any one of (1) to (4).
Equipped with a rotation mechanism that rotates the above optical system
The rotation mechanism has a first state in which one side of the projected image is parallel to the first direction, and a second state in which the projected image is rotated in one rotation direction with respect to the first state. The image is rotated between the state and the third state in which the projected image is rotated in the other rotation direction with respect to the first state.
In the first state, the above relationship of 0 <B1 ≦ (D1-L1) × 0.5 is established.
A projection device in which the projected image is formed in the light receiving surface in each of the second state and the third state.

(6)
(5) The projection device according to the above.
It has the same positional relationship as the third position of the projected image in the second state in the second direction and the third position of the projected image in the second direction in the second state in the third state. When the distance from the fourth position is S2, the width of the projected image in the first state in the first direction is L1, and the width of the light receiving surface in the second direction is D2.
A projection device in which the relationship of S2 + L1 ≦ D2 holds.

(7)
The projection device according to any one of (1) to (5).
The first position is the center position of the projected image.
The second position is a projection device which is the center position of the light receiving surface.

(8)
(6) The projection device according to the above.
The first position, the third position, and the fourth position are the center positions of the projected image, respectively.
The second position is a projection device which is the center position of the light receiving surface.

(9)
The projection device according to any one of (1) to (8).
The part of the optical system is a projection device including an optical member that reflects an image from the display unit and guides the image to the projection object, and transmits light from the projection object to guide the image sensor. ..

(10)
(9) The projection device according to the above.
The optical member is a projection device that is a half mirror or a polarizing plate.

Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood. Further, each component in the above embodiment may be arbitrarily combined as long as the gist of the invention is not deviated.

Note that this application is based on a Japanese patent application filed on June 28, 2019 (Japanese Patent Application No. 2019-121539), the contents of which are incorporated herein by reference.

100 Projector 1 Main body 2

First member

2a, 2b Opening 2A Hollow part 21 First optical system 22 Reflective member 3

Second member

3a, 3c Opening 3A Hollow part 31 Second optical system 32 Branch member 33 Third optical system 34

Lens

34A, 34B, 34C, 34D Region l1, l2 Straight line 37 Fourth optical system 38 Imaging element 38a Light receiving surface 4 Rotating mechanism 6 Optical unit 11 Light source unit 41 Light source 42 Color wheel 43 Illumination optical system 12 Optical modulation unit 12a Optical modulation element 12A Display surface 15 Housing 15a Opening K Optical axis SC screen d1 Image G1 Projection image g1 Projection image capture image IM Imaging range

Claims

An optical system that projects an image from the display onto an object to be projected,
An image pickup device that captures an image of the projection object through a part of the optical system is provided.
The image pickup device has a light receiving surface in which a plurality of pixels are two-dimensionally arranged in a first direction and a second direction in which the first direction intersects.
The image in a state where the image projected on the projection object is imaged at the position of the light receiving surface by the part of the optical system is defined as a projection image, and the width of the projection image in the first direction. Is L1, and the width of the light receiving surface in the first direction is D1, the relationship of L1 <D1 is established.
Further, the distance between the first position of the projected image in the first direction and the second position of the light receiving surface in the first direction having the same positional relationship as the first position in the projected image is defined as B1. If you do
A projection device having a relationship of 0 <B1 ≦ (D1-L1) × 0.5.
The projection device according to claim 1.
An image pickup optical system having a variable focal length arranged between the part of the optical system and the image pickup element is provided.
A projection device in which the above relationship holds when the focal length of the imaging optical system is maximum.
The projection device according to claim 1 or 2.
A projection device in which the size of one pixel of the projected image is equal to or larger than the size of the pixel on the light receiving surface.
The projection device according to claim 3.
The radius of the imaging image circle in the subject range imaged at the position of the light receiving surface by the part of the optical system is R3, and the light condensing range of the optical system at the position of the display unit. When the radius of the display image circle is R1, the size of the pixel on the light receiving surface is P3, and the size of the display pixel of the display unit is P1.
A projection device in which the relationship of (P1 / P3) × (R3 / R1) ≧ 1 holds.
The projection device according to any one of claims 1 to 4.
A rotation mechanism for rotating the optical system is provided.
The rotation mechanism is a first state in which one side of the projected image is parallel to the first direction, and a second state in which the projected image is rotated in one rotation direction with respect to the first state. The image is rotated between a state and a third state in which the projected image is rotated in the other rotation direction with respect to the first state.
In the first state, the above relationship of 0 <B1 ≦ (D1-L1) × 0.5 is established.
A projection device in which the projected image is formed in the light receiving surface in each of the second state and the third state.
The projection device according to claim 5.
It has the same positional relationship as the third position in the second direction of the projected image in the second state and the third position in the second direction of the projected image in the third state. When the distance from the fourth position is S2, the width of the projected image in the first state in the first direction is L1, and the width of the light receiving surface in the second direction is D2.
A projection device in which the relationship of S2 + L1 ≦ D2 holds.
The projection device according to any one of claims 1 to 5.
The first position is the center position of the projected image.
The second position is a projection device which is a central position of the light receiving surface.
The projection device according to claim 6.
The first position, the third position, and the fourth position are the center positions of the projected image, respectively.
The second position is a projection device which is a central position of the light receiving surface.
The projection device according to any one of claims 1 to 8.
The part of the optical system is a projection device including an optical member that reflects an image from the display unit and guides the image to the projection object, and transmits light from the projection object to guide the image sensor. ..
The projection device according to claim 9.
The optical member is a projection device that is a half mirror or a polarizing plate.