JP5402541B2 - Projection optical device and image display device - Google Patents

Description

  The present invention relates to a projection optical device and an image display device including the projection optical device.

  Conventionally, projection optical devices such as projectors are known. In order to shorten the distance between a projection surface such as a screen and the projection optical device, light modulated by a display element of an image forming unit is projected on the projection surface. A projection optical device that performs enlarged projection has been proposed. A technique of forming an image on the display element as an intermediate image between the projection lens unit and the reflection mirror and placing a concave mirror on the image forming unit has been considered and is already known.

However, the conventional projection optical apparatus has a problem that the thickness of the apparatus increases.
Specifically,
(1) Since the concave mirror used for the enlarged projection protrudes downward due to the configuration of the optical system, the size of the apparatus as a whole increases.
(2) During projection, there is no problem even if the device size is increased due to the projection of the mirror as long as it does not obstruct the projection screen, but the mirror becomes an obstacle when it is not used or stored. ,
(3) Space other than the concave mirror has no use, and is wasted.
There was a problem.

Here, as an example of the prior art, Patent Document 1 (Japanese Patent No. 3924054) discloses a liquid crystal projector provided with a retractable projection mirror for the purpose of reducing the size of the projector. A liquid crystal projector is described which is configured to allow the user to fall down / cause the camera.
However, Patent Document 1 describes a configuration that enables the projection mirror to collapse / cause, but the collapse / cause mechanism when there is an overlap in the optical path between the projection mirror and another optical element. There is no suggestion about.

In Patent Document 2 (Japanese Patent Laid-Open No. 2008-250277), the panel is brought closer to the screen with respect to the optical axis of the projection lens unit (refractive optical system) for the purpose of widening the projection light of the projection display device (projector). Since the imaging light beam travels in the direction opposite to this direction (screen side), the mirror (reflecting surface) moves in the direction in which the imaging light beam travels, that is, on the side opposite to the screen side across the optical axis. A protruding configuration is disclosed.
However, Patent Document 2 describes that the projection is performed using a mirror, but there is a problem that a step corresponding to the shift of the mirror portion occurs and the size of the apparatus increases.

Patent Document 3 (Japanese Patent Laid-Open No. 2008-165202) discloses a configuration in which an opening covered with a light-transmitting member is provided in a housing that houses a projection optical system for the purpose of preventing dust from adhering to the projection optical system. Has been.
This Patent Document 3 describes that the mirror is installed in a direction opposite to the projection surface (downward). However, the mirror is fixed in the housing, and there is a problem that the size of the apparatus increases. .

FIG. 11 of Patent Document 4 (Japanese Patent Laid-Open No. 2009-086315) discloses a projection optical apparatus configured to move so that a mirror approaches a lens and to reduce the size during non-projection.
However, in Patent Document 4, the mirror is not moved in the height direction of the device, but is slid in the depth direction of the device, so that it does not become smaller in the height direction of the device.

  The present invention has been made in view of the above circumstances, and can realize enlarged projection without increasing the size of the apparatus, and can reduce the thickness of the apparatus during non-projection, thereby improving portability and storage. An object of the present invention is to provide a projection optical device that can be used, and an image display device including the projection optical device.

In order to achieve the above object, the present invention employs the following solutions.
According to a first aspect of the present invention, there is provided a projection optical apparatus comprising: an image forming unit; a projection lens unit into which light emitted from the image forming unit is incident; and light emitted from the projection lens unit. A projection optical apparatus comprising a mirror portion that reflects toward a projection surface and a housing that accommodates the mirror portion, and a variable relative position or angle in the height direction of the mirror portion with respect to the optical axis of the projection lens portion. And a step correction member that protrudes below the housing in a state where the mirror portion is raised, and the step with the mirror portion can be corrected by protruding the step correction member. (Claim 1).

The second solving means of the present invention is a projection optical device, comprising an image forming unit, a projection lens unit to which light emitted from the image forming unit is incident, and light emitted from the projection lens unit. A mirror part that reflects toward the projection surface; and a housing that accommodates the mirror part, the mirror part having a rotation axis on a side surface of the mirror part, and a height direction with respect to the optical axis of the projection lens part In the projection optical apparatus configured to be variable in angle, the projection optical device has a step correction member that protrudes below the housing in a state where the mirror portion is raised, and the step correction member protrudes to correct the step with the mirror portion. It is possible to do this (claim 2).

According to a third solving means of the present invention, in the projection optical apparatus according to the second solving means, the mirror portion is provided so as to be rotatable about the rotation shaft, and constitutes a wall surface of the housing in the collapsed state. In the raised state, the projection optical system is configured by projecting in a direction opposite to the projection surface side (claim 3).

According to a fourth solving means of the present invention, in the projection optical apparatus according to any one of the first to third solving means, the step correction member adjusts a correction amount by adjusting an amount of protrusion downward of the housing. It can be arbitrarily set (claim 4).

The fifth solving means of the present invention is a projection optical apparatus of any one of the solutions of the first to fourth, in the state that caused the mirror section, that the mirror unit also serves as the foot of the projection optical system It is characterized (claim 5).
According to a sixth solving means of the present invention, in the projection optical apparatus according to any one of the first to fifth solving means, a member protruding below the casing is provided separately from the step correction member. It is characterized (claim 6).

Seventh solving means of the present invention is a projection optical apparatus of any one of the solutions of the first乃 optimum 6, in a state of causing the mirror unit, characterized in that it has a mechanism for fixing the mirror unit (Claim 7).
According to an eighth aspect of the present invention, there is provided the projection optical apparatus according to any one of the fourth to seventh aspects , wherein the mirror unit or the projection lens unit is rotated by a driving unit so that the step correction is performed. A switch for operating the members in conjunction with each other is provided (claim 8).

Ninth solving means of the present invention is a projection optical apparatus of the first solving means, the image forming unit and the projection lens unit, and having a member for moving in the vertical direction (Claim 9).
According to a tenth solving means of the present invention, in the projection optical apparatus according to any one of the first to ninth solving means, the projection optical apparatus is rotated approximately 90 degrees and installed in a vertical position for projecting on a desk. When the projector is used in a projector, a height adjusting member for holding the projection optical device is provided, and the projection size can be adjusted by adjusting the height by the height adjusting member (claim). Item 10).

The eleventh solving means of the present invention is characterized by comprising the projection optical device of any one of the first to tenth solving means and a screen as a projection surface .

  In the present invention, since the relative position or angle of the mirror unit in the height direction with respect to the optical axis of the projection lens unit is variably configured, the optical system is accommodated in the casing when not projecting, so that the thickness direction of the projection optical device Therefore, it is possible to provide a projection optical apparatus that can realize enlarged projection without increasing the apparatus size. Furthermore, it is possible to provide a projection optical device that can reduce the thickness of the device and improve portability and storage during non-projection, and an image display device including the projection optical device.

It is a figure which shows the 1st Example of this invention, Comprising: It is a figure explaining the state at the time of the operation | movement in a projection optical apparatus, and a non-operation. It is a figure which shows the 2nd Example of this invention, Comprising: It is a figure explaining the state at the time of the non-operation | movement in a projection optical apparatus. It is a figure which shows the 3rd Example of this invention, Comprising: It is a figure explaining the state at the time of the operation | movement in a projection optical apparatus, and a non-operation. It is a figure which shows the 4th Example of this invention, Comprising: It is a figure explaining the state at the time of operation | movement in a projection optical apparatus. It is a figure which shows the 5th Example of this invention, Comprising: It is a figure explaining the state at the time of operation | movement in a projection optical apparatus. It is a figure which shows the 6th Example of this invention, Comprising: It is a figure explaining the state at the time of the operation | movement in a projection optical apparatus, and a non-operation. It is a figure which shows the 7th Example of this invention, Comprising: It is a figure explaining the state at the time of the operation | movement in a projection optical apparatus, and a non-operation.

Embodiments of the present invention will be described below.
In the present invention, with respect to the configuration of the projection optical device, the relative position or angle in the height direction of the mirror unit with respect to the optical axis of the projection lens unit is configured to be variable, and projection is performed depending on whether the projection optical device is used or not. When the projection optical device is not used, the relative distance in the height direction between the projection lens unit and the mirror unit is a feature that the relative position in the height direction between the lens unit and the mirror unit can be changed. By shortening, it is possible to reduce the size of the projection optical device in the thickness direction. Hereinafter, this feature will be specifically described with reference to the drawings.

[Example 1]
FIG. 1 is a diagram showing a first embodiment of the present invention, and is a diagram for explaining a state of the projection optical apparatus during operation and during non-operation.
1A and 1B, the projection optical device 100 includes a housing 18, an image forming unit 1, a first optical system 2, and a second optical system 3 housed in the housing 18. Yes. In the projection optical apparatus 100, the image forming unit 1 is disposed above the optical axis 10 of the first optical system 2 and the second optical system 3 is the first optical system 3 in order to project an image on a projection surface such as a screen at a wide angle. The optical system 2 is disposed below the optical axis 10. The first optical system 2 is composed of a projection lens unit composed of a plurality of lenses, and the second optical system 3 is composed of a mirror unit 4 composed of a concave mirror or the like.

  Light from a light source (not shown) passes through an illumination optical system (not shown) and reaches the image forming unit 1. Examples of the types of display elements constituting the image forming unit 1 include a transmissive liquid crystal panel, DLP (Digital Light Processor), LCoS (Liquid Crystal on Silicon), and DMD (Digital Micromirror Device).

  The image formed by the image forming unit 1 is formed as an intermediate image between the first optical system and the second optical system 3 by the projection lens unit 2 of the first optical system, and is a mirror of the second optical system 3. After being reflected by the unit 4, the light is projected onto a projection surface 5 such as a screen to form a projected image. The projection image is formed on the projection surface 5 in the direction opposite to the direction in which the mirror portion 4 of the second optical system 3 protrudes from the housing 18. That is, in FIG. 1, the mirror unit 4 protrudes below the housing 18 of the projection optical apparatus 100, and a projection image is formed in the upward direction of the housing 18.

  The image forming unit 1, the first optical system (projection lens unit) 2, the mirror unit 4 of the second optical system 3, and the projection surface 5 have such a positional relationship, whereby the mirror unit 4 of the second optical system 3. Since the distance from the projection image to the projection image can be increased, wide-angle projection is possible as a result, and an enlarged image can be projected on the projection surface 5. Furthermore, since the mirror part 4 of the second optical system 3 protrudes in the direction opposite to the projection surface 5, there is no concern that the second optical system 3 blocks the projection image.

  FIG. 1A shows a state when the projection optical apparatus 100 is not operated, and FIG. 1B shows a state when the projection optical apparatus 100 is operated. When the switch 6 is pressed from the state of FIG. 1A, the projection optical device 100 starts to operate, and a gear (not shown) is rotated by a motor (not shown) or the like, so that the mirror part of the second optical system 3 4 rotates counterclockwise, and a part of the mirror portion 4 protrudes downward from the bottom surface of the housing 18, and a member (hereinafter referred to as a step correction member) 8 that corrects a step in conjunction with this is shown in FIG. As shown in (b), the projection protrudes to the opposite side (downward direction) of the projection side (upward direction).

  In the projection optical apparatus 100 of the present embodiment, the mirror unit 4 of the second optical system 3 has a rotation shaft 9 on the side surface of the mirror unit 4, and the angle of the projection lens unit 2 with respect to the optical axis 10 in the height direction. Since it is variably configured, the projection optical system can be configured by changing the relative positions of the image forming unit 1 and the first optical system (projection lens unit) 2 and the second optical system 3 (mirror unit 4). However, by attaching the mirror part 4 of the second optical system 3 so that it can be tilted / raised with respect to the bottom surface of the casing, it can also serve as the wall surface of the projection optical system during non-projection. Thereby, there is an advantage that it is not necessary to attach / remove the wall surface at the time of projection / non-projection.

  Here, “constructing a projection optical system” means that the state shown in FIG. The mirror part 4 of the second optical system 3 rotates around the rotation axis 9 when protruding. The rotating shaft 9 is parallel to the x-axis direction in the figure. Further, in order to protect the mirror part 4 of the second optical system 3, a mirror holding member 7 is attached to the side of the mirror part 4 that does not block the light beam. The mirror holding member 7 also has a function of holding the back surface of the mirror portion 4 of the second optical system 3, and the rotation shaft 9 may be provided on the side surface of the mirror holding member 7. Thus, by having the rotating shaft 9 in the housing | casing 18, as shown to Fig.1 (a), the size (especially size of a height direction) of the projection optical apparatus 100 can be made small at the time of non-projection.

  When the projection optical device 100 is used, as shown in FIG. 1B, the upper end side 19 of the second optical system 3 (mirror part 4) is locked by the position fixing member 11 at a position constituting the projection optical system. Then the rotation is stopped and fixed. The position fixing member 11 may be positioned by directly contacting the mirror portion 4 of the second optical system 3 or may be provided via a mirror holding member 7 that protects the mirror portion 4 of the second optical system 3. When positioning by directly contacting the mirror portion 4 of the second optical system 3, it may be outside the effective range that does not block the light flux of the mirror portion 4. It may be installed at two places on both upper ends.

  Since the protruding direction of the second optical system 3 (mirror part 4) is the direction of gravity, it is possible to prevent the position of the second optical system 3 (mirror part 4) from moving erroneously due to external factors during operation. . In addition, when it is not held only by gravity, it may be fixed by pressing a spring member or the like from the opposite side of the position fixing member 11 as a mechanism for fixing the raised mirror part 4. In the case of a mechanism that rotationally drives the mirror unit 4 via a plurality of gears, the plurality of gears can also function as a stopper.

  As shown in FIG. 1B, the lower end side 20 of the second optical system 3 (mirror part 4) at the time of protrusion also serves as a foot of the projection optical apparatus 100. Further, in order to prevent the projection optical device 100 from being tilted by a step caused by the protrusion of the mirror part 4 of the second optical system 3, a step correction member 8 protruding below the housing 18 is provided on the side opposite to the mirror part 4. Is provided. The step correction member 8 protrudes below the housing 18 and becomes a foot of the projection optical apparatus 100. The adjustment of the protruding amount of the step correction member 8 can be arbitrarily set by providing a male screw on the outer periphery of the step correction member 8 and providing a female screw for receiving the male screw on the casing side and its rotating mechanism. Further, the step correction member 8 can be moved up and down by a mechanism such as a rack and pinion. In this way, the projection angle can be adjusted by adjusting the amount of protrusion of the step correction member 8.

  When the use of the projection optical apparatus 100 is stopped, the gear is rotated by driving means such as a motor by pressing the switch 6 in the state of FIG. 1B, and the mirror part of the step correction member 8 and the second optical system 3. 4 are accommodated at the same time, and the projection optical apparatus 100 stops as shown in FIG. In FIG. 1, the mirror unit 4 of the second optical system 3 protrudes below the casing 18. However, the mirror unit 4 of the second optical system 3 is inverted from the top and bottom of FIG. You may make it comprise a projection optical system by protruding over.

[Example 2]
FIG. 2 is a diagram showing a second embodiment of the present invention, and is a diagram for explaining a state when the projection optical apparatus is not operating.
In the first embodiment shown in FIG. 1, the step correction member 8 is accommodated on the left side of the housing 18 so as to be movable up and down. However, as shown in FIG. It can be accommodated along the bottom surface of the housing 18 by being attached so as to be able to collapse / retract. In this case, if the step correction member 8 can be fixed at an arbitrary angle, the amount of protrusion of the step correction member 8 can be adjusted. Specifically, if the step correction member 8 is configured to rotate via a gear by a motor or the like and stops at an arbitrary angle, the protruding amount of the step correction member 8 can be adjusted.

[Example 3]
FIG. 3 is a diagram showing a third embodiment of the present invention, and is a diagram for explaining a state of the projection optical apparatus during operation and during non-operation.
3A, 3 </ b> B, 3 </ b> C, and 3 </ b> D, the projection optical device 100 includes a housing 18, an image forming unit 1 housed in the housing 18, and a first optical system (projection). A lens unit) 2 and a second optical system 3 (mirror unit 4). Further, the projection optical apparatus 100 includes a holding member 14 that holds the image forming unit 1 and the first optical system (projection lens unit) 2 so as to be movable in the vertical direction. That is, in the configuration of the present embodiment, the mirror unit 4 is configured so that the image forming unit 1 and the first optical system (projection lens unit) 2 are movable in the vertical direction so that the mirror unit 4 has the first optical system (projection lens unit). ) It can move relative to a position that overlaps the optical axis 10 of 2 and a position that does not overlap.

Next, a specific operation will be described. FIG. 3A shows a state when the projection optical apparatus 100 is not operating. On the lower surface of the holding member 14 that holds the image forming unit 1 and the first optical system (projection lens unit) 2 so as to be movable in the vertical direction, support members 12 that are attached so as to be able to fall down / raise are provided at two locations. Each support member 12 is provided with a knob 13 attached so as to be able to collapse / retract.
When operating the projection optical apparatus 100, first, as shown in FIG. Next, as shown in FIG. 3C, the knob 13 is pulled to raise the support member 12 for moving the holding member 14, and the knob 13 is returned to the support member side. Finally, the lid 15 of the housing 18 is removed, and the image forming unit 1 and the first optical system (projection lens unit) 2 are moved upward by pushing the support member 12 upward as shown in FIG. And fixed. Then, the operation of the projection optical system is started in the state of FIG.

In FIG. 1 described above, an example in which the projection optical system is configured by moving the mirror unit 4 of the second optical system 3 is shown, but in FIG. 3, the image forming unit 1 and the first optical system (projection lens unit) are arranged. The example which comprises changing a relative position with the mirror part 4 by moving and comprising a projection optical system was shown. In addition to this, it is naturally conceivable that the image forming unit 1, the first optical system (projection lens unit) 2, and the second optical system (mirror unit) 3 are all moved to constitute a projection optical system. What is important is the relative positional relationship between the first optical system (projection lens unit) 2 and the mirror unit 4 of the second optical system 3 in use, and the first optical system (projection lens unit) 2 and the second optical system 3 Any one or both of the mirror units 4 may be moved relative to each other so that the projection optical system is arranged.
3, the first optical system (projection lens unit) 2 may move downward, and the mirror unit 4 of the second optical system 3 may be inverted upside down from the state shown in FIG.

[Example 4]
FIG. 4 is a diagram showing a fourth embodiment of the present invention, and is a diagram for explaining a state during operation of the projection optical apparatus.
4, the same reference numerals as those in FIG. 1 denote the same constituent members, but FIG. 4 shows an example in which a screw hole for attaching the step correction member 8 in FIG. 1 is formed. Therefore, in this embodiment, the step correction member 8 can be removed. In the case of this example, the step correction member 8 having a plurality of lengths is prepared, or the step correction member 8 having a variable length is used to adjust the step correction amount and the projection angle. be able to.

[Example 5]
FIG. 5 is a diagram showing a fifth embodiment of the present invention, and is a diagram for explaining a state during operation of the projection optical apparatus.
In FIG. 5, the same reference numerals as those in FIG. 4 are the same constituent members, but in FIG. 5, the switch 6 in FIG. 4 is omitted and the mirror part 4 of the second optical system 3 is manually folded. By adopting such a configuration, driving means such as a motor and a gear become unnecessary, and the component cost can be reduced.

[Example 6]
FIG. 6 is a diagram showing a sixth embodiment of the present invention, and is a diagram for explaining a state when the projection optical apparatus is operating and when not operating.
FIGS. 6A and 6B show a mode for projecting an image on a desk in the projection optical apparatus shown in any one of the embodiments.
That is, in the illustrated example, the projection optical device 100 having the configuration shown in any of FIGS. 1, 2, 4, and 5 is rotated 90 degrees and used in a vertically installed state. Can be projected on a desk.
In addition, the height adjustment member 16 is provided in the housing 18, and the height adjustment member 16 is provided with an adjustment screw mechanism, thereby adjusting the height and adjusting the projection size. As for the method for storing the height adjusting member 16, various methods similar to those for the step correcting member 8 described above can be applied.

[Example 7]
FIG. 7 is a diagram showing a seventh embodiment of the present invention, and is a diagram for explaining a state of the projection optical apparatus during operation and during non-operation.
1, 2, 4, and 5, the holding member 7 of the mirror unit 4 of the second optical system 3 also serves as the foot of the projection optical apparatus 100. In the projection optical apparatus 100 shown, a holding member 17 that protrudes below the housing 18 is separately provided. Since the housing 18 is held by the holding member 17 and the above-described step correction member 8, the position of the mirror portion 4 is shifted due to an external factor when the mirror portion 4 of the second optical system 3 protrudes. Can be prevented.

[Example 8]
The projection optical apparatus 100 shown in the first to seventh embodiments described above can be combined with a screen serving as the projection surface 5 to form an image display apparatus having a simple configuration.
As an example, a rear projection system that is easy to carry if a screen 5 that can be raised / fallen and is detachable is mounted on the upper surface of the housing 18 of the projection optical apparatus 100 having the configuration shown in FIG. Or a front projection type image display device.
In the case of the configuration shown in FIG. 3, the lid 15 that covers the upper surface of the housing 10 also serves as a screen, and if the image is projected by causing the lid 15 that also serves as the screen, an image display device is configured. be able to.

1: Image forming unit 2: First optical system (projection lens unit)
3: Second optical system 4: Mirror part 5: Projection surface (screen)
6: Switch 7: Mirror holding member 8: Step correction member 9: Rotating shaft 10: Optical axis of projection lens unit 11: Position fixing member 12: Support member 13: Knob 14: Holding member 15: Lid 16: Height adjusting member 17: Holding member 18: Housing 100: Projection optical device

Japanese Patent No. 3924054 JP 2008-250277 A JP 2008-165202 A JP 2009-086315 A

Claims (11)

An image forming unit; a projection lens unit to which light emitted from the image forming unit is incident; a mirror unit for reflecting light emitted from the projection lens unit toward a projection surface; In a projection optical apparatus comprising a body and configured to variably configure a relative position or angle of the mirror unit in the height direction with respect to the optical axis of the projection lens unit ,
A projection having a step correction member protruding below the housing in a state where the mirror portion is raised, and the step with the mirror portion can be corrected by the protrusion of the step correction member. Optical device. An image forming unit; a projection lens unit to which light emitted from the image forming unit is incident; a mirror unit for reflecting light emitted from the projection lens unit toward a projection surface; A projection optical device comprising a body, the mirror unit having a rotation axis on a side surface of the mirror unit, and an angle in a height direction with respect to the optical axis of the projection lens unit being variably configured ;
A projection having a step correction member protruding below the housing in a state where the mirror portion is raised, and the step with the mirror portion can be corrected by the protrusion of the step correction member. Optical device. The projection optical apparatus according to claim 2,
The mirror part is provided so as to be rotatable about the rotation axis, and constitutes the wall surface of the housing in the collapsed state, and constitutes a projection optical system by protruding in the opposite direction to the projection surface side in the raised state. A projection optical device. In the projection optical apparatus according to any one of claims 1 to 3 ,
The projection optical apparatus , wherein the step correction member can arbitrarily set a correction amount by adjusting a protruding amount of the casing downward . In the projection optical apparatus according to any one of claims 1 to 4 ,
A projection optical apparatus characterized in that when the mirror part is raised , the mirror part also serves as a foot of the projection optical apparatus. In the projection optical apparatus according to any one of claims 1 to 5 ,
In addition to the step correction member , a projection optical apparatus having a member protruding below the casing . In the projection optical apparatus according to any one of claims 1 to 6,
A projection optical apparatus having a mechanism for fixing the mirror part in a state where the mirror part is raised. In the projection optical apparatus according to any one of claims 4 to 7 ,
A projection optical apparatus comprising: a switch that operates the mirror unit or the projection lens unit and the step correction member in conjunction with each other by rotating a gear by a driving unit . The projection optical apparatus according to claim 1 ,
A projection optical apparatus comprising a member for moving the image forming unit and the projection lens unit in a vertical direction . The projection optical apparatus according to any one of claims 1 to 9 ,
When the projector is used in a state where the projection optical device is rotated approximately 90 degrees and installed in a vertical position for projecting on a desk, a height adjustment member for holding the projection optical device is provided, and the height is adjusted by the height adjustment member. A projection optical apparatus characterized in that a projection size can be adjusted by adjusting . A projection optical device according to any one of claims 1 to 10, an image display apparatus comprising the screen is a projection surface.

Images