JP2020134787A - Projection type display device - Google Patents

Abstract

To provide a projection type display device that does not increase energizing force of a backlash of a sliding part of a lens shift mechanism in a desired direction when inertial force is applied.SOLUTION: A projection type display device comprising: a projection optical system that projects an image to a projected surface; shift means that holds the projection optical system to be able to drive in a direction intersecting with an optical axis; a base member that faces the shift means; and energization means that energizes the shift means in a direction intersecting with the optical axis for the base member, is characterized to have energizing force adding means that adds energizing force of the energization means energizing the shift means to the base member.SELECTED DRAWING: Figure 1(a)

Description

The present invention relates to a projection type display device, and more particularly to a projection type display device having a lens shift mechanism.

In order to project an image at a desired position on a projected surface such as a screen, it is necessary to adjust the installation position of the projection type display device. At this time, by installing a lens shift mechanism that holds the projection lens movable, it is possible to improve convenience at the time of installation. It is desirable that the lens shift is fixed without deviation after adjustment. The prior art discloses a mechanism that regulates the movement of the lens shift after adjustment. In Patent Document 1, the driving of the lens shift is regulated by engaging the gear that transmits the driving force of the lens shift with the tooth portion of the switching member. In Patent Document 2, the shift plates are fixed to each other by fastening screws in the optical axis direction.

Japanese Unexamined Patent Publication No. 2014-71194 Japanese Unexamined Patent Publication No. 2012-230198

In recent years, a projection type display device may be used in a flight simulator device or the like. In these, the projection type display device itself moves violently. When acceleration is generated in the projection type display device during movement, an inertial force is generated in the lens shift mechanism in the direction opposite to the acceleration of the projection type display device. The lens shift mechanism has some rattling in the sliding portion, but there is a demand for preventing the lens shift mechanism from shifting due to the rattling due to this inertial force and preventing deterioration of the optical performance of the projected image. Further, there is a demand that one projection type display device can handle both the use of moving the projection type display device violently and the conventional use of stationary display device.

However, in the method of Patent Document 1, although the movement of the lens shift is regulated by engaging and disengaging the gear that transmits the driving force, the backlash of the sliding portion is not removed, and when the inertial force is applied, the sliding portion of the sliding portion is regulated. The shift plate moves by the amount of backlash. Further, in the method of Patent Document 2, the movement of the plates is regulated by fastening the screws, but the frictional force between the screw head and the plate is not transmitted to the plate in a uniform direction at the time of fixing, and the plate is slightly rattled. It rotates and cannot maintain the desired posture, resulting in deterioration of optical performance.

Therefore, an object of the present invention is to provide a projection type display device that prevents the rattling of the sliding portion of the lens shift mechanism from increasing the urging force in a desired direction when an inertial force is applied.

In order to achieve the above object, the projection type display device according to the present invention
A projection optical system that projects an image onto the projected surface,
A shift means that holds the projection optical system and can be driven in a direction intersecting the optical axis.
A base member facing the shift means and
An urging means that urges the shifting means in a direction intersecting the optical axis with respect to the base member.
In the projection type display device having
The shift means has an urging force adding means for increasing the urging force of the urging means with respect to the base member.

According to the present invention, it is possible to provide a projection type display device that prevents the rattling of the sliding portion of the lens shift mechanism from increasing the urging force in a desired direction when an inertial force is applied.

Perspective view of the lens shift mechanism according to the first embodiment of the present invention. Perspective view of the lens shift mechanism according to the first embodiment of the present invention. Overall view of the projection type display device according to the first embodiment of the present invention. Schematic diagram of a projection type display device according to the first embodiment of the present invention. An exploded perspective view of the lens shift mechanism according to the first embodiment of the present invention. An exploded perspective view of the lens shift mechanism according to the first embodiment of the present invention. An exploded perspective view of the lens shift mechanism according to the first embodiment of the present invention. An exploded perspective view of the lens shift mechanism according to the first embodiment of the present invention. An exploded perspective view of the lens shift mechanism according to the first embodiment of the present invention. An exploded perspective view of the lens shift mechanism according to the first embodiment of the present invention. An exploded perspective view of the lens shift mechanism according to the first embodiment of the present invention. Perspective view of the lens shift mechanism according to the second embodiment of the present invention. Perspective view of the lens shift mechanism according to the second embodiment of the present invention. Perspective view of the lens shift mechanism according to the second embodiment of the present invention. Detailed view of the urging force addition mechanism and the detection switch according to the third embodiment of the present invention. Detailed view of the urging force addition mechanism and the detection switch according to the third embodiment of the present invention. Detailed view of the urging force addition mechanism and the detection switch according to the third embodiment of the present invention. Block diagram of the projection type display device according to the third embodiment of the present invention. Flow chart of control process of lens shift mechanism according to the third embodiment of the present invention

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

(Configuration of projection display device)
FIG. 3 shows a part of the configuration of the projection type display device 32. The light from the light source lamp 33 is converted into light having a predetermined polarization direction through an illumination optical system (not shown) and incident on the color separation synthesis optical system 100. Reference numeral 104 denotes a dichroic mirror 104 that reflects R (red) and B (blue) light and transmits G (green) light. Reference numeral 102 denotes a polarization beam splitter 102 for G that transmits P-polarized light and reflects S-polarized light. Reference numeral 103 denotes a polarizing beam splitter for RB, which reflects R light as it is S-polarized light and passes B light converted to P-polarized light to perform color separation.

101G is a reflective liquid crystal panel for G color, and 101R and 101B are reflective liquid crystal panels for R and B as well. 105R, 105G, and 105B are a 1/4 wave plate for red, a 1/4 wave plate for green, and a 1/4 wave plate for blue, respectively. Reference numeral 106 denotes a synthesizing polarized beam splitter for synthesizing R, G, and B light. The polarizing beam splitter 106 for synthesis can be substituted for a dichroic mirror or a dichroic prism. The polarizing beam splitter 106 for synthesis synthesizes the incident three colors of modulated light and guides the light to the projection lens 17. The projection lens 17 projects the synthesized three-color modulated light onto a projected surface 107 such as a screen. As a result, the projected image corresponding to the input video signal is displayed on the projected surface 107. The projection lens 17 is movably held by the lens shift mechanism 161.

In the present invention, the projection type display device 32 using the reflective liquid crystal panels 101R, 101G, 101B as the light modulation element has been described, but the projection type display using another light modulation element such as a digital micromirror device (DMD) has been described. The device is also included in the embodiments of the present invention.

(Structure of lens shift mechanism)
Next, the configuration of the lens shift mechanism 161 according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1, 2, and 4.

FIG. 4 shows an assembly procedure of the lens shift mechanism 14.

As shown in FIG. 4A, the first shift plate 1 is provided with an opening 1a into which the projection lens 17 is inserted. The inside of the circle of the opening 1a is the xz plane, and the direction perpendicular to it is the y-axis. The first shift plate 1 is formed with four through holes 1b, two at the top and two at the bottom, about the z direction into which the first guide bar 2 is inserted. The first guide bar 2 is one in two through holes 1b located in the + x direction with respect to the opening 1a and one in two through holes 1b located in the −x direction with respect to the opening 1b. After the two are inserted, they are fixed to the first fixing plate 3 as shown in FIG. 4 (b). The first fixing plate 3 is provided with an opening 3a into which the projection lens 17 is inserted. Grooves 3b are formed in the first fixing plate 3 at four positions located at the ends of the two first guide bars 2, and the first guide bar 2 has two clove guide bars at the ends. It is fixed to the first fixing plate 3 by the fixing sheet metal 4. The guide bar fixing sheet metal 4 is fastened with two first screws 5 each.

As shown in FIG. 4C, the drive unit 6 is fixed to the first fixing plate 3 by the second screw 7. The first shift plate 1 is driven in the z-axis direction by the drive unit 6. The drive unit 6 has a feed frame 6a and is inserted into the frame pocket 1c of the first shift 1. The feed piece 6a has a female screw having a shaft parallel to the z-axis and is screwed into a lead screw 6b having a shaft parallel to the z-axis. The lead screw 6b is inserted into the drive unit sheet metal 6d and fixed in the thrust direction with an E ring (not shown). The drive force of the motor 6e is transmitted to the lead screw 6b via the gear 6c to rotate the lead screw 6b. The feed top 6a is inserted into the top pocket 1c, but the rotation component of the z-axis is regulated by the wall 1d of the top pocket. There must always be a slight gap between the through hole 1b of the first shift plate 1 and the first guide bar 2 for sliding. The above description describes the positional relationship of the "base member facing the shift means" of claim 1. The first shift 1 corresponds to the shift means, and the base member corresponds to the first fixing plate 3.

4 (d) and 4 (e) show the urging force adding mechanism 13. The procedure for assembling the urging force addition mechanism 13 will be described. As shown in FIG. 4D, the sheet metal 8 is provided with a groove 8a for moving the urging force adding piece 9 so that the urging force adding piece 9 can be inserted and moved. The groove 8a for moving the urging force adding piece has a downward L-shape, and is cut out from the periphery of the sheet metal 8 to the L-shaped part so that the urging force adding piece 9 can be inserted. 8b is provided. After inserting the urging force adding piece 9 into the sheet metal 8, one end of the first tension coil spring 10 is fastened to the urging force adding piece 9 with a third screw 121. Further, one end of the second tension coil spring 11 is fastened to the sheet metal 8 with the third screw 121. FIG. 4 (e) shows a schematic view of the urging force adding mechanism 13. The first tension coil spring 10 is configured to be rotatable between the head of the third screw 121 and the urging force adding piece 9. For example, the third screw may be made into a stepped screw and received at a place other than the thread cutting portion. Alternatively, it may be received by a bearing pulley.

After assembling the urging force adding mechanism 13, the urging force adding mechanism 13 is assembled to the first shift plate 1 with the fourth screw 14. In FIG. 4 (f), the four corners of the sheet metal 8 of the urging force adding mechanism 13 are fastened with the fourth screw 14. The unfixed ends of the first tension coil spring 10 and the second tension coil spring 11 are fastened to the first fixing plate 3 with the fifth screw 15, and the lens shift mechanism 161 according to this embodiment is completed. To do. After the lens shift mechanism 161 is completed, the projection lens 17 is fastened with the sixth screw 18 as shown in FIG. 4 (g).

FIG. 1 shows a lens shift mechanism 161 according to this embodiment.

In the state of FIG. 1A, the first shift plate 1 is gripped by the feed piece 6a of the drive unit 6 and is stopped at the position of the feed piece 6a. An urging force (in the thrust direction of the guide bar 2 and the downward direction on the paper surface) is generated on the first shift plate only by the second tension coil spring 11, and the first shift plate 1 rotates about the top pocket 1c, and the first shift plate 1 is rotated. It is offset to the first guide bar 2 held by one fixing plate 3. The feed piece 6a does not rotate with respect to the first shift plate 1, and only the propulsive force of the lead screw is transmitted to the first shift plate 1. When the propulsive force of the lead screw is transmitted to the first shift plate 1, the first shift plate 1 is driven along the thrust direction of the first guide bar 2. The drive direction of the first shift 1 is a direction intersecting the optical axis direction of the projection lens 17 (the axial direction of the cylindrical portion of the projection lens 17 in FIG. 1A). Further, the urging force generated by the tension coil spring 11 also serves to remove the backlash generated by the lead screw 6b and the feed piece 6a (the backlash in the thrust direction of the lead screw 6b).

As shown in FIG. 1 (a), when the urging force adding piece 9 is moved in the direction of the arrow 19, the first tension coil spring 10 is extended as shown in FIG. 1 (b). A urging force is applied to the first shift plate 1 by the tension coil spring 10.

With the above configuration, when used in an application where inertial force is applied, the urging force adding piece 9 of the urging force adding mechanism 13 is moved as shown in FIG. 1 (b), and the urging force by the tension coil spring 10 is used. By adding the above, it is possible to eliminate the rattling of the lens shift mechanism 161 in a desired direction and suppress the deterioration of the optical performance of the projected image. Further, when used in a stationary application, the urging force due to the tension coil spring 10 of the urging force adding mechanism 13 is eliminated as shown in FIG. 1A. If the urging force remains increased, the frictional force acting on the loose sliding part increases, a stick-slip phenomenon occurs, and the projected image flies discretely, making it difficult to adjust. However, by reducing the urging force of the tension coil spring 10, the friction between the sliding surfaces (the contact portion between the first shift plate 1 and the first guide bar 2) can be reduced, so that when adjusting the lens shift mechanism 161 It is possible to prevent the projected image from shaking.

FIG. 2 shows a state in which the lens shift mechanism 161 according to this embodiment is incorporated in the projection type display device 32.

The adjustment knob 122 has a columnar shape so that the head of the third screw 121 fastened to the urging force addition piece 9 (not shown) can be manually driven. The exterior 20 of the projection type display device 32 opens a range in which the adjustment knob 122 is driven, and has a hole for the user to access the third screw 12.

With the above configuration, when an inertial force is applied, it is possible to prevent the rattling of the sliding portion of the lens shift mechanism from increasing the urging force in a desired direction.

Although the lens shift mechanism 161 of the type using the guide bar has been described as the embodiment, the type of the lens shift is not limited to this.

(Structure of lens shift mechanism)
The lens shift mechanism 162 according to the second embodiment of the present invention will be described with reference to FIGS. 1, 2, 4, 5, and 6.

FIG. 5 shows the lens shift mechanism 162 according to this embodiment.

In order to improve the installability of the projection type display device 32, the lens shift mechanism 162 is provided in the biaxial direction of the orthogonal coordinate system (orthogonal coordinate system xz plane in the drawing) that runs on a surface parallel to the projected surface 105. It has a movable configuration.

In this embodiment, a lens shift mechanism 162 that can be driven in the biaxial direction and that can perform one-sided backlash and addition of the urging force in the biaxial direction with only one urging force adding mechanism 13 will be described.

FIG. 5A shows a perspective view of the lens shift mechanism 162, and FIG. 5B shows a perspective view of the lens shift mechanism 162 as viewed from the back side. The y-axis of the Cartesian coordinate system in the figure is parallel to the optical axis of the projection lens 17, and the direction from the liquid crystal panel 102 side to the projected surface 105 side is positive.

As shown in FIG. 5A, a first shift plate 1, a first guide bar 2, an urging force adding mechanism 13, a projection lens 17, and a drive unit 61 in the vertical direction (± z direction in FIG. 5A) 61. The configuration of (the drive unit 6 was used in the first embodiment) is the same as that of the first embodiment. The drive unit 61 is fixed to the second shift plate 22 and drives the first shift plate 1 in the ± z-axis direction. In this embodiment, in addition to the driving direction of the first shift plate 1 of the lens shift mechanism 161 of the first embodiment, the second guide bar 21 is provided in the direction orthogonal to the driving direction (± x-axis direction in the drawing). It is fixed to the shift plate 22 with a sheet metal 8, and the shift plate 22 can be driven along the through hole 23a of the second fixing plate 23. The axis of the through hole 23a is provided parallel to the x-axis direction, and a total of two second guide bars 21 are inserted into the projection lens 17, one in the + z direction and one in the −z direction. ..

As shown in FIG. 5B, the second fixing plate 23 is provided with a spring pedestal 23b and is inserted through a through hole 22a of the second shift plate 22. One end of the first tension coil spring 10 and the second tension coil spring 11 of the urging force addition mechanism 13 (the unfastened end of FIG. 4 (e)) is as shown in FIG. 5 (a). , It is fixed to the spring pedestal 23b with the seventh screw 24.

As shown in FIG. 5A, the drive unit 62 in the left-right direction is fixed to the second fixing plate 23 by the eighth screw 25. The second shift plate 22 is driven by the drive unit 62 in a direction perpendicular to the drive direction of shift 1 (± x-axis direction in the drawing). There must always be a slight gap between the through hole 23a of the second fixing plate 23 and the second guide bar 21 for sliding. The tension coil spring 10 is a piece of the gap between the through hole 1b of the first shift plate and the first guide bar 2 and the gap between the through hole 23a of the second fixing plate 23 and the second guide bar 21. The pulling and the backlash of the lead screw generated in the drive units 61 and 62 in the thrust direction are collectively removed.

With the above configuration, when used in an application where an inertial force is applied, the urging force adding piece 9 is moved in the direction of the arrow 27 of the urging force adding mechanism 13 as shown in FIG. By adding the urging force of the tension coil spring 10 (state of FIG. 5A), the rattling of the lens shift mechanism 162 is eliminated by shifting it in a desired direction (same as the urging direction of the tension coil spring 10). It is possible to suppress the deterioration of the optical performance of the projected image. Further, when used in a stationary application, as shown in FIG. 6, by eliminating the urging force by the tension coil spring 10 of the urging force adding mechanism 13, the sliding surfaces (first shift plate 1 and first). The friction between the contact portion of the guide bar 2 and the contact portion between the second fixing plate 23 and the second guide bar 21) can be reduced, and the projected image can be prevented from shaking when the lens shift mechanism 162 is adjusted.

Similar to the lens shift mechanism 161 of FIG. 2, the lens shift mechanism 162 according to the present embodiment can be incorporated in the projection type display device 32, and the user can access the third screw 121.

Further, the lens shift mechanism 162 can shift and fix the biaxial direction in which the projection lens 17 shifts with a single operation.

Although a lens shift mechanism of a type using a guide bar has been described as an embodiment, the type of lens shift is not limited to this.

The lens shift mechanism 163 according to the third embodiment of the present invention will be described with reference to FIGS. 7, 8 and 9.

In this embodiment, an embodiment in which the lens shift mechanism 163 is not driven when an urging force is applied to the first tension spring 10 of the urging force adding mechanism 13 described in the first and second embodiments is shown.

The lens shift mechanism 163 of this embodiment detects that the first tension spring 10 has added an urging force to the urging force adding mechanism 13 of the lens shift mechanisms 161 and 162 described in the first and second embodiments. The switch 25 is installed.

As shown in FIG. 7A, the detection switch 25 is composed of a rectangular parallelepiped housing portion 25a and a rod portion 25b, and is fastened to the urging force adding mechanism 13 with a ninth screw 28. The detection switch 25 becomes On when the rod portion 25b of the detection switch enters the housing portion 25b of the detection switch 25. Further, the detection switch 25 has a rod portion when the urging force adding piece 9 shown in FIG. 7B is at the position where the urging force of the first tension coil spring 10 is applied (FIG. 7C). The 25b is pushed by the urging force adding piece 9 in the direction of entering the housing portion 25b, and is fastened at a position where it enters the housing portion 25b. A cord unit 26c is installed in the detection switch 25, and On / Off information is transmitted to the control unit 29 of the lens shift mechanism 163 via the cord unit 26c.

7 (a) and 7 (b) show a state in which no urging force is applied to the first tension spring 10 of the urging force adding mechanism 13, and the rod portion 25b of the detection switch 25 is the housing portion 25a of the detection switch 25. It shows that it has not entered. FIG. 7C shows a state in which an urging force is applied to the first tension spring 10 of the urging force adding mechanism 13, and the rod portion 25b of the detection switch 25 enters the housing portion 25a of the detection switch 25, and the detection switch. It shows how 25 is On.

8 and 9 show the processing flow of the control unit 29 of the lens shift mechanism 163 in this embodiment.

When the user drives the lens shift mechanism 163, the user performs a shift operation in the lens shift mechanism operation unit 30 of FIG. When the shift operation is performed by the lens shift mechanism operation unit 30, information on the shift operation is transmitted to the control unit 29, and the drive unit 63 of the lens shift mechanism 163 is driven.

FIG. 9 shows the control flow of the control unit 27 of the lens shift mechanism 163 in this embodiment.

When the user drives the lens shift mechanism 163, the lens shift mechanism operation unit 30 of FIG. 8 performs a shift operation (step S1).

When the shift operation is performed, the control unit 29 determines whether the detection switch 26 is On or Off (step S2).

When the control unit 29 receives the Off information from the detection switch 26, the control unit 29 transmits the information to energize the motor of the drive unit 63 (step S3). When the detection switch receives the On information, the process is terminated and the lens shift mechanism 163 is prevented from being driven.

Whether or not the projected image has reached the target position is determined by a value detected by an encoder 31 (not shown), and if the projected image has not reached the target position, the motor is re-energized. When the target position is reached, the process ends (step S4).

With the above configuration, when the urging force of the urging force adding mechanism 13 is added as shown in FIGS. 1B and 7C, an excessive load is applied to the motor and the lens shift mechanism 163 fails. Can be prevented.

In the embodiment, the detection switch 26 is physically detected, but other detection means can be applied and the present invention is not limited to this.

1 First shift plate, 1a Opening of the first shift plate 1,
1b Through hole for inserting the guide bar 2 of the first shift plate 1,
1c The top pocket of the first shift plate 1,
1d The wall of the top pocket of the first shift plate 1,
2 First guide bar, 3 First fixing plate, 3a Opening of fixing plate 3,
3b Groove of fixing plate 3, 4 Guide bar fixing sheet metal, 5 First screw,
6 Drive unit according to the first embodiment, 61 Vertical drive unit according to the second embodiment,
62 Left and right ward drive unit according to the second embodiment, 63 Drive unit according to the third embodiment,
6a feed top, 6b lead screw, 6c gear, 6d drive sheet metal,
6e motor, 7 second screw, 8 sheet metal,
8a groove for moving the urging force addition piece 9, 8b notch,
9 Frame for adding urging force, 10 First tension coil spring,
11 Second tension coil spring, 121 Third screw, 122 Adjustment knob,
13 urging force addition mechanism, 14 fourth screw, 15 fifth screw,
161 Lens shift mechanism according to the first embodiment,
162 Lens shift mechanism according to the second embodiment,
163 Lens shift mechanism according to the third embodiment,
17 projection lens, 18 sixth screw, 19 arrow, 20 exterior,
21 2nd guide bar, 22 2nd shift plate, 23 2nd fixing plate,
23a through hole, 23b spring pedestal, 24 7th screw, 25 8th screw,
26 detection switch, 26a detection switch housing,
26b Detection switch rod part,
26c detection switch cord, 27 arrow, 28 9th screw,
29 Control unit of lens shift mechanism 163,
30 Lens shift mechanism operation unit, 31 encoder, 32 projection type display device,
33 Light source lamp, 100 color separation synthesis system, 101R reflective liquid crystal panel for red,
Reflective LCD panel for 101G red, Reflective LCD panel for 101B red,
Polarized beam splitter for 102 G, Polarized beam splitter for 103 RB,
104 dichroic mirror, 1/4 wave plate for 105R red,
1/4 wave plate for 105G green, 1/4 wave plate for 105B blue,
106 Polarized beam splitter for synthesis, 107 Projected surface

Claims (4)

A projection optical system that projects an image onto the projected surface,
A shift means that holds the projection optical system and can be driven in a direction intersecting the optical axis.
A base member facing the shift means and
An urging means that urges the shifting means in a direction intersecting the optical axis with respect to the base member.
In the projection type display device having
A projection-type display device comprising the urging force adding means for adding the urging force of the urging means for urging the shifting means to the base member. The shift means includes a urging force detecting means for detecting that an urging force has been added to the fixing means, and a control means for receiving the result of the urging force detecting means, and the controlling means has the urging force. The projection type display device according to claim 1, wherein when it is detected from the detection result of the detection means that an urging force has been added, the shift means cannot be driven. A projection optical system that projects an image onto the projected surface,
A first shift means that holds the projection optical system and can be driven in a direction intersecting the optical axis.
A base member facing the first shift means and
A second shift means for driving the projection optical system in a direction intersecting the drive direction of the first shift means,
An urging means for urging the first shifting means and the second shifting means in a direction intersecting the optical axis with respect to the base member.
In the projection type display device having
A projection type display device comprising the urging force adding means for adding the urging force of the urging means for urging the first shifting means and the second shifting means to the base member. The first shift means and the second shift means include a urging force detecting means for detecting that an urging force has been added to the urging force adding means and a control means for receiving the result of the urging force detecting means. The projection type display according to claim 3, wherein the control means makes the shift means undriveable when an urging force is added based on the detection result of the urging force detecting means. apparatus.