JP2003149729A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector which can correctly display a projection image by preventing the projection image from blurring even if vibration, etc., is applied. SOLUTION: In the projector 1, acceleration sensors 23 corresponding to respective leg parts 20 detect the acceleration of vibration applied to a projector main body 10, and an arithmetic part 24 computes the extension/contraction quantities of the respective leg parts 20 for canceling the detected acceleration and outputs the electric signals of arithmetic results to actuators 22 of the respective leg parts 20. Each actuator 22 extends or contracts the leg part 20 vertically by a specific quantity according to the inputted electric signal. Consequently, the attitude of the projector main body 10 is held. Hence, even if the vibration, etc., is applied, the projection image can be held always at a fixed position and the projection image can correctly be displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector.

[0002]

BACKGROUND ART Conventionally, a light flux emitted from a light source is separated into three color lights of RGB by a dichroic mirror,
The three liquid crystal panels (light modulators) modulate each color light according to the image data, and the modulated light fluxes are combined by a cross dichroic prism (color combining optical system), and the projection lens (projection optical system) is combined. There is known a so-called three-plate type in which a color image is enlarged and projected on a screen via the screen. Such a projector has been made smaller and lighter in order to ensure portability and versatility. As a result, the projector is not limited to being installed in a large hall or the like and used, for example, in a desk of a small conference room. It is becoming easier to use by placing it on the top.

[0003]

However, for example, a desk or the like in a small conference room has a relatively low rigidity and easily picks up vibrations from the surroundings, so that a person heading for the desk may move a little or move something on the desk. Even just doing, the desk will move slightly. Moreover, since the projector originally enlarges and projects a small image, such a minute movement of the desk is enlarged, and such a slight shake of the desk causes a great shake in the projected image. .
Therefore, there is a problem in that the projected image becomes extremely unsightly. Particularly, with recent miniaturization and weight reduction, a slight vibration is easily transmitted, and such a problem is becoming more prominent.

The object of the present invention is to
An object of the present invention is to provide a projector capable of preventing the shaking of the projected image and displaying the projected image correctly.

[0005]

A projector according to the present invention enlarges and projects a composite image formed by modulating a plurality of color lights according to image information for each color light and combining the modulated light beams. A projector including an apparatus main body including an optical system to support, and a plurality of legs supporting the apparatus main body,
An acceleration detecting unit that detects the acceleration of vibration applied from the outside, and at least one of the plurality of legs is expanded or contracted based on the acceleration of the vibration detected by the acceleration detection unit, so that the posture of the device main body. And a posture maintaining means for maintaining.

According to the present invention, when vibration is applied from the outside, the acceleration detecting means such as an acceleration sensor or a gyro sensor detects the direction and magnitude of the acceleration of the vibration, and the posture maintaining means detects the direction and magnitude of the acceleration. The posture of the device main body is maintained by moving the plurality of legs in a direction that cancels out the detected acceleration. Therefore, even if vibration is applied from the outside, the posture of the device body is always maintained, which allows the projection image to be constantly maintained at a constant position. That is,
Even if vibration is applied, the projected image can be prevented from shaking and the projected image can be displayed correctly.

In such a projector, it is preferable that the acceleration detecting means is installed on each of the plurality of legs. According to such a configuration, the acceleration detecting means is installed on each leg, so that the vibration in each part of the projector can be detected more accurately, compared to the case where only one acceleration detecting means is installed. The posture of the device body can be maintained accurately.

In the projector as described above, it is preferable that the posture maintaining means includes the plurality of leg portions and an actuator that extends and contracts each of the leg portions with respect to the support surface of the apparatus body. With such a configuration, for example, the posture of the device body can be maintained with a simple configuration in which a relatively small actuator is attached to each of the plurality of legs.

Further, it is preferable that the actuator expands or contracts any one of the legs by an electromagnetic drive mechanism. Here, as the electromagnetic drive mechanism, for example, a linear motor or a voice coil motor can be adopted. In such a case, compared to the case where an actuator using another medium such as a fluid is adopted, it is possible to make the configuration simple by preparing a small electromagnet, a coil, or the like for the leg portion, and to reduce the size. Can be planned.

A projector according to the present invention is provided with an optical system for modulating a plurality of color lights in accordance with image information for each color light, and enlarging and projecting a composite image formed by combining the modulated light fluxes. And an optical element for changing the position of an optical element forming the optical system based on an acceleration detecting means for detecting an acceleration of vibration applied from the outside and an acceleration of the vibration detected by the acceleration detecting means. A posture adjusting means is provided.

According to the present invention, when vibration is applied from the outside, the acceleration detecting means such as an acceleration sensor or a gyro sensor detects the direction and magnitude of the acceleration of the vibration, and the optical element attitude adjusting means. , By changing the position of an optical element such as a lens or a prism that constitutes an optical system based on the detected acceleration of vibration by a predetermined amount in a direction opposite to the applied acceleration. By changing the direction of the optical axis emitted from the optical system, the enlarged and projected optical image can always be maintained at a constant position.
Therefore, even if vibration or the like is applied from the outside, the projection image can be prevented from shaking and the projection image can be displayed correctly.

In such a projector, the optical system includes a projection optical system for enlarging and projecting the combined light,
It is preferable that the optical element attitude adjusting unit includes a lens that constitutes the projection optical system and an actuator that changes the position of the lens. In such a configuration,
After combining the color lights to form a composite image, the optical axis direction of the composite image is changed to maintain the position of the projected image. The control mechanism of the optical element can be made relatively simple compared to the above. At this time, since the lens is moved by the actuator, the lens moving mechanism can be made simple and compact.

A projector according to the present invention combines a plurality of light modulators for modulating a plurality of color lights for each color light according to image information and the color lights emitted from the respective light modulators, and enlarges the composite image. And an optical system for projecting the light, the acceleration detecting unit detecting an acceleration of a vibration applied from the outside, and the optical modulator of the optical modulator based on the acceleration of the vibration detected by the acceleration detecting unit. Image display adjusting means for changing the image display position in the image forming area is provided. Specifically, the image display adjusting means can be configured as software that operates on an arithmetic processing means such as a CPU that controls the projector.

According to the present invention, when vibration is applied from the outside, the acceleration detecting means such as an acceleration sensor or a gyro sensor detects the direction and magnitude of the acceleration of the vibration, and the image display adjusting means, Based on the detected acceleration of vibration, the image display position in the image forming area of the light modulator is changed by, for example, a predetermined amount in the direction opposite to the acceleration of applied vibration, thereby enlarging the image. The position of the projected optical image can always be maintained at a constant position. Therefore, even if vibration or the like is applied from the outside, the projection image can be prevented from shaking and the projection image can be displayed correctly. Also,
Since the image display position in the image forming area is changed by software, the special device such as the actuator described above is not required, and the projector can have a simple configuration.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view showing a projector 1 according to the first embodiment of the present invention. FIG. 2 is a diagram schematically showing the optical unit 4 that constitutes the projector 1. Further, FIG. 3 is a schematic diagram showing a state in which the projector 1 is turned upside down.
The projector 1 modulates a plurality of color lights for each color light according to image information, and enlarges and projects a composite image configured by combining the modulated light fluxes, as shown in FIGS. In addition, the projector body 10 having a substantially rectangular parallelepiped shape, and the four corner portions 10AA to 1A of the rear surface 10A of the projector body 10.
From 0AD, this back surface 10A and four leg portions 20 (20A to 20D) vertically projecting and contracting are provided.

The projector main body 10 has a main function as a projector, and as shown in FIG. 1, an outer case 11 made of resin, and a planar U-shaped optical unit 4 arranged in the outer case 11 (see FIG. 2) and a driver board (not shown) that controls the operation of the optical unit 4.

As shown in FIG. 2, the optical unit 4 as an optical system is a unit that optically processes the light beam emitted from the light source lamp 411 to form an optical image corresponding to image information, and is an integrator. An illumination optical system 41,
A color separation optical system 42, a relay optical system 43, an electro-optical device 44, a cross dichroic prism 45 as a color combining optical system, and a projection lens 46 as a projection optical system are provided.

The integrator illumination optical system 41 includes three liquid crystal panels 441 (red,
Liquid crystal panels 441R and 441 for green and blue color lights respectively
G, 441B) is an optical system for illuminating an image forming area of the light source device 413, a first lens array 418, a second lens array 414 including a UV filter, and a polarization conversion element 415. A first condenser lens 416, a reflection mirror 424, and a second condenser lens 419.

The light source device 413 comprises a light source lamp 411 for emitting a radial ray and a reflector 412 for reflecting the emitted light emitted from the light source lamp 411.
As the light source lamp 411, a halogen lamp, a metal halide lamp, or a high pressure mercury lamp is often used. A parabolic mirror is used as the reflector 412. In addition to the parabolic mirror, an ellipsoidal mirror may be used together with a collimating lens (concave lens).

The first lens array 418 has a structure in which small lenses having a substantially rectangular contour when viewed in the optical axis direction are arranged in a matrix. Each small lens has a light source lamp 4
The light flux emitted from 11 is divided into a plurality of partial light fluxes.
The contour shape of each small lens is set to be substantially similar to the shape of the image forming area of the liquid crystal panel 441.
For example, if the aspect ratio (ratio of horizontal and vertical dimensions) of the image forming area of the liquid crystal panel 441 is 4: 3, the aspect ratio of each small lens is also set to 4: 3.

The second lens array 414 has substantially the same structure as the first lens array 418, and has a structure in which small lenses are arranged in a matrix. The second lens array 414, together with the first condenser lens 416 and the second condenser lens 419, forms a first lens array 418.
Has a function of forming an image of each small lens on the liquid crystal panel 441.

The polarization conversion element 415 is arranged between the second lens array 414 and the first condenser lens 416 and is unitized with the second lens array 414. Such a polarization conversion element 415 has a second
The light from the lens array 414 is converted into one type of polarized light, which improves the utilization efficiency of light in the electro-optical device 44.

Specifically, the polarization conversion element 415 is used to
The respective partial lights converted into the polarized light of the types are finally passed through the first condenser lens 416 and the second condenser lens 419, and finally the liquid crystal panels 441R, 4 of the electro-optical device 44.
It is almost superimposed on 41G and 441B. In the projector 1 (electro-optical device 44) of this embodiment using the liquid crystal panel 441 that modulates polarized light, since only one type of polarized light can be used, the light source lamp 411 that emits another type of randomly polarized light is used. Almost half of the light is unused. Therefore, by using the polarization conversion element 415,
All the light emitted from the light source lamp 411 is converted into one type of polarized light, and the light utilization efficiency in the electro-optical device 44 is improved. Such a polarization conversion element 415 is introduced in, for example, Japanese Patent Laid-Open No. 8-304739.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423. The dichroic mirrors 421 and 422 divide a plurality of partial light beams emitted from the integrator illumination optical system 41 into red and green. , And has a function of separating into three color lights of blue. The relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and supplies the colored light and the blue light separated by the color separation optical system 42 to the liquid crystal panel 4.
It has the function of leading up to 41B.

In such an optical unit 4, the dichroic mirror 421 of the color separation optical system 42 transmits the blue light component and the green light component of the luminous flux emitted from the integrator illumination optical system 41, and at the same time, produces the red light component. reflect. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 417, and reaches the liquid crystal panel 441R for red. The field lens 417 converts each partial light flux emitted from the second lens array 414 into a light flux parallel to the central axis (chief ray) thereof. The same applies to the field lens 417 provided on the light incident side of the other liquid crystal panels 441G and 441B.

Of the blue light and the green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 417, and reaches the liquid crystal panel 441G for green. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, and further passes through the field lens 417 to reach the liquid crystal panel 441B for blue light. Note that the relay optical system 43 is used for blue light in order to prevent a decrease in light utilization efficiency due to light diffusion or the like because the optical path length of blue light is longer than the optical path lengths of other color lights. is there. That is, the partial light flux that has entered the incident side lens 431 is directly transmitted to the field lens 417.

The electro-optical device 44 includes three liquid crystal panels 441R, 441G and 441B as light modulators, which use, for example, a polysilicon TFT as a switching element, and the color separation optical system 42. The respective color lights separated by are separated by these three liquid crystal panels 441.
R, 441G and 441B form an optical image by being modulated according to the image information.

The cross dichroic prism 45 has three
The image modulated for each color light emitted from the liquid crystal panels 441R, 441G, and 441B is combined to form a color image (composite image). In the cross dichroic prism 45, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interfaces of the four rectangular prisms. Three color lights are combined by the dielectric multilayer film. Then, the color image combined by the cross dichroic prism 45 is emitted from the projection lens 46 and enlarged and projected on the screen.

The driver board is a substrate for controlling each liquid crystal panel 441R, 441G, 441B by controlling image information and performing arithmetic processing according to the image information. In addition, this driver board has four legs 20 (2) based on the vibration applied to the projector 1.
The expansion / contraction of 0A to 20D) is also controlled.

FIG. 4 is a block diagram showing the functional arrangement of the projector 1 when adjusting the attitude of the projector body 10. As shown in FIG. 4, the projector 1 has a function of adjusting the posture of the projector body 10, and is provided corresponding to the four leg portions 20 (20A to 20D) and the leg portions 20 (20A to 20D). Actuators 22 (22A to 22D) and the respective leg portions 20
(20A to 20D), an acceleration sensor 23 (23A to 23D) serving as an acceleration detecting unit, and C
And a calculation unit 24 including a PU and the like. The posture maintaining means described in the claims has four leg portions 20 (20A to 20A).
D), the actuator 22 (22A to 22D), and the calculation unit 24.

Referring to FIG. 3, the four legs 20 (20A to 20D) are resin members for supporting the projector main body 10 in a correct posture on the upper surface of the desk or the like in the conference room.
The actuator 22 (22A to 22D) is a member that is driven by a magnetic circuit (electromagnetic drive mechanism) according to an input electric signal and expands and contracts in a certain direction. By driving this actuator 22, the corresponding leg portion 20 (20A to 2A)
0D) expands and contracts in a certain direction (vertical direction). The acceleration sensor 23 (23A to 23D) detects the acceleration of vibration applied from the outside as the acceleration in the three-dimensional directions of up, down, left, right, and front by the piezoelectric element. An element for detecting the acceleration in the rotation direction may be added to the acceleration sensor 23.

As shown in FIG. 4, in this projector 1, the acceleration of vibration applied to the projector body 10 from the outside is detected by the acceleration sensor 23 (23A-23D) corresponding to each leg 20 (20A-20D). The acceleration is detected in the three-dimensional direction, and the calculation unit 24 such as a CPU
Each leg 20 (20) for canceling out the detected acceleration
The amount of expansion and contraction of A to 20D) is calculated, and the electric signal of the calculation result is output to the actuator 22 of each leg 20 (20A to 20D). Each of the actuators 22 has a leg portion 2 based on the input electric signal by a predetermined amount.
0 (20A to 20D) is expanded and contracted in the vertical direction.

FIG. 5 is a diagram showing how the projector 1 is installed on the desk 30 in the conference room and an image is projected on the screen 40. Specifically, as shown in FIG. 5A, the projector 1 is installed on the desk 30 and an image is projected on the screen 40. In this state, FIG. 5 (B)
As shown in FIG. 7, when the screen 40 side of the desk 30 is lifted upward by vibration, the acceleration sensor 23 detects the acceleration of the vibration at this time, and the leg portion 20C is used to cancel the acceleration of the vibration. , 20D contracts. As a result, the projected image Z on the screen 40 is always kept at the same position without shaking even in the case of FIG. 5A and the case of FIG. 5B.

According to this embodiment as described above, the following effects are obtained. (1) When vibration is applied from the outside, the acceleration sensor 23
At this time, the acceleration of this vibration is detected, and based on this detection result, the actuator 22 expands and contracts the leg 20 in a direction to cancel the detected acceleration, so that the attitude of the projector main body 10 is maintained. Therefore, even if vibration or the like is applied, the projection image Z can always be maintained at a constant position, and the projection image Z can be displayed correctly.

(2) The acceleration sensor 2 is attached to each leg 20.
Since 3 is installed, compared to the case where only one acceleration sensor 23 is installed, vibration in each part of the projector 1 can be accurately detected, and the posture of the projector main body 10 can be maintained more accurately.

(3) An actuator 22 is used to extend and contract the leg portion 20. This actuator 22 is
Since it is relatively small, the posture of the projector main body 10 can be maintained with a simple configuration in which it is attached to each leg 20.

(4) Since the actuator 22 that expands and contracts by the electromagnetic drive mechanism is adopted, the expansion and contraction mechanism of the leg portion 20 can be made simpler and smaller than the case where other actuators 22 using fluid or the like are adopted. Can be achieved.

[Second Embodiment] Next, a projector 2 according to a second embodiment of the present invention will be described with reference to the drawings.
The same or corresponding components as those of the first embodiment are designated by the same reference numerals, and the description will be omitted or simplified. The projector 2 according to the second embodiment is substantially the same as the projector 1, but differs from the projector 1 in that the four legs 20 do not expand and contract, and the movable means of the lenses forming the projection lens 46 are provided. To do. Only the differences will be described below.

FIG. 6 is a block diagram showing a functional configuration of the projector 2. As shown in FIG. 6, the projector 2 has a function of changing the position of a shift lens as a lens that constitutes the projection lens 46, and the shift lens 32 that constitutes the projection lens 46 and the vicinity of the shift lens 32 are provided. An acceleration sensor 23 as the above-described acceleration detecting means installed, an actuator 33 for moving the shift lens 32, and a calculation unit 34 including a CPU and the like are provided. The optical element attitude adjusting means described in the claims is composed of a shift lens 32, an actuator 33, and a computing section 34.

The actuator 33 is similar to the actuator 22 of the first embodiment, and is driven by a magnetic circuit (electromagnetic drive mechanism) in accordance with an input electric signal (electromagnetic drive mechanism) and holds a shift lens 32. (Not shown) is a member that moves in the illumination optical axis direction. It should be noted that three actuators 33 are provided for the lens holder that holds the shift lens 32 in order to move the actuator 33 in the vertical direction, the horizontal direction, and the front-back direction, respectively.

The shift lens 32 is a concave lens located at the center of the five lenses constituting the projection lens 46, and can be moved in the vertical direction, the horizontal direction, and the front-back direction by the actuator 33. Is configured. When the shift lens 32 moves, the light flux incident on the shift lens 32 moves the optical axis in the same direction as the moving direction.

As shown in FIG. 6, in this projector 2, the acceleration of the vibration applied from the outside is detected by the acceleration sensor 23 as the acceleration in the three-dimensional direction, and the calculation unit 34 is used.
Then, the detected acceleration is cancelled, the movement amount of the shift lens 32 at which the position of the projection image Z becomes constant is calculated, and the electric signal of the calculation result is output to the actuator 33. The actuator 33 moves the shift lens 32 in each direction by a predetermined amount based on the input electric signal.

FIG. 7 is a diagram showing a state in which the projector 2 is installed on a desk or the like (not shown) and a projected image is projected on the screen 40. As shown by the solid line in FIG. 7, when the projector 2 is in the proper state, the shift lens 32 is at the reference position, and the optical axis of the emitted light beam is in the direction indicated by the arrow P.

On the other hand, as shown by the alternate long and short dash line in FIG. 7, when the projector 1 is lifted in the upward direction A due to external vibration, the acceleration sensor 23 detects the acceleration of the vibration at this time, The shift lens 32 moves downward so that the acceleration of this vibration is canceled and the position of the projected image Z becomes constant. As a result, the optical axis of the emitted light beam moves downward as indicated by arrow Q.

As shown by the chain double-dashed line in FIG. 7, when the projector 1 is lowered in the downward direction B by vibration, the acceleration sensor 23 detects the acceleration at this time,
The shift lens 32 moves upward so that this acceleration is canceled and the position of the projected image Z becomes constant. As a result, the optical axis of the emitted light beam moves upward as indicated by arrow R. From the above, the projected image Z (FIG. 6) on the screen 40 is always kept at the same position without shaking even if vibration is applied from the outside.

According to this embodiment, the following effects are obtained. (5) When vibration is applied from the outside, the acceleration sensor 23
At this time, the acceleration of this vibration is detected, and based on this detection result, the actuator 33 moves the shift lens 32 so that the position of the projection image Z becomes constant, so that the projection image Z is always maintained at a constant position. The projection image Z can be displayed correctly.

(6) Since the shift lens 32 constituting the projection lens 46 is configured to move, the projection lens 46
As compared with the case where the lens or the like in the previous stage is moved, the control mechanism for the lens or the like can be relatively simple. At this time, since the shift lens 32 is moved by the same actuator 33 as that described above, the moving mechanism of the shift lens 32 can be made simple and compact.

(7) Since the actuator 33 that expands and contracts by the electromagnetic drive mechanism is adopted, the moving mechanism of the shift lens 32 can be made simpler and smaller than the case where other actuators 33 using fluid or the like are adopted. Can be achieved.

[Third Embodiment] Next, a projector 3 according to a third embodiment of the present invention will be described with reference to the drawings.
The same or corresponding components as those of the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted or simplified. The projector 3 according to the third embodiment is substantially the same as the projector 1, except that the projector 1 is a means for changing the image display position in the image forming area of the liquid crystal panel without the four legs 20 expanding and contracting. It is different in that it is equipped with. Only the differences will be described below.

FIG. 8 is a block diagram showing the functional arrangement of the projector 3. FIG. 9 shows liquid crystal panels 441R and 44.
It is a figure which shows the image S in the image forming area Y of 1G and 441B. As shown in FIG. 8, the projector 3 has a function of changing the display position of the image S in the image forming area Y on the liquid crystal panels 441R, 441G, and 441B, and is installed near the liquid crystal panels 441R, 441G, and 441B. Acceleration sensor 23 as the above-described acceleration detecting means
An arithmetic unit 51 including a CPU and the like, and a liquid crystal panel 441.
The image display adjusting means 52 for changing the display position of the image S in the image forming areas Y of R, 441G and 441B.

Here, as shown in FIG. 9, the liquid crystal panel 4
The size of the image forming area Y of 41R, 441G, and 441B is formed larger than the size of the image S required to project an appropriate projected image Z (FIG. 8). For this reason,
As shown in FIGS. 9B and 9C, the display position of the image S can be changed in the image forming area Y.

In such a projector 3, as shown in FIG. 8, the acceleration of the vibration applied from the outside is detected by the acceleration sensor 23 as the acceleration in the three-dimensional direction, and the calculation unit 5 is operated.
In 1, the display position adjustment amount of the image S necessary to make the position of the projection image Z constant by canceling out the detected acceleration is calculated, and the electric signal of the calculation result is sent to the image display adjusting means 52. Output. The image display adjusting means 52 changes the display position of the image S based on the input electric signal.

Here, FIG. 10 is a diagram showing a state in which the projector 3 is installed on a desk or the like (not shown) and an image is projected on the screen 40. As shown in FIG. 10A, when the projector 3 is in the proper state, the image S on the liquid crystal panels 441R, 441G, and 441B is located at the center of the image forming area Y as usual. This image S is magnified and projected at an appropriate position on the screen 40 via the optical system 43 in the subsequent stage.

In this state, when vibration is applied from the outside and the projector 3 is lifted in the upward direction A, the acceleration of the vibration at this time is detected by the acceleration sensor 23 as shown in FIG. Is detected and the acceleration of this vibration is canceled out so that the position of the projected image Z becomes constant, and the image display adjusting means 52 is operated by the liquid crystal panels 441R, 441G ,.
The display position of the image S in the image forming area Y of 441B is changed to a position below the central reference position.

On the other hand, as shown in FIG. 10C, when vibration is applied from the outside to lower the projector 3 in the downward direction B, the acceleration sensor 23 detects the acceleration of the vibration at this time, The image display adjusting means 52 is provided so that the acceleration of this vibration is canceled so that the position of the projected image Z becomes constant.
Changes the display position of the image S in the image forming area Y on the liquid crystal panels 441R, 441G, 441B to a position above the central reference position. From the above, the projected image Z on the screen 40 is always kept in the same position without shaking even if vibration is applied from the outside.

According to this embodiment as described above, the following effects can be obtained. (8) When the vibration is applied from the outside, the acceleration sensor 23
At this time, the acceleration of this vibration is detected, and based on this detection result, the detected acceleration is cancelled, and the liquid crystal panels 441 R, 4 are arranged so that the position of the projected image Z becomes constant.
By changing the display position of the image S in the image forming area Y on 41G and 441B, the projection image Z can be always maintained at a constant position, and the projection image Z can be displayed correctly.

(9) Since the display position of the image S in the image forming area Y is changed by software, for example, a special device such as an actuator is not required, and the structure of the projector 3 can be simplified.

The present invention is not limited to the above-described embodiments, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention.
In the first embodiment, four legs 2 are used as the plurality of legs.
The number of the leg portions and the number of the leg portions that extend and contract are not particularly limited. That is, the projector main body 1 has three legs.
It may be configured to support 0. In this case, one leg is provided at each of the left and right ends on the front side of the projector 1, and one leg is provided at the center of the rear side so that only the two front legs expand and contract. it can.

In the first embodiment, the acceleration sensor 23 is provided on each of the four legs 20, but the present invention is not limited to this, and one acceleration sensor 23 may be provided near the light source device 413 of the projector 1, for example. May be In short, the number of acceleration sensors 23 to be installed is not particularly limited.

In the first embodiment, the actuator 22 is adopted as the member for expanding and contracting the leg portion 20, but
It is not limited to this. Similarly, in the second embodiment, the actuator 33 is adopted as a member for moving the shift lens 32, but it is not particularly limited as long as it can move in a fixed direction. At this time, as the actuators 22 and 33, those driven by an electromagnetic drive mechanism are adopted, but actuators driven by other mechanisms may be adopted.

In the second embodiment, the shift lens 3 constituting the projection lens 46 is used as a movable lens.
However, the present invention is not limited to this, and an optical element such as a lens forming an optical system other than the projection lens 46 may be adopted. In short, any optical element may be used as long as the optical axis of the light beam emitted from the light source can be changed. In addition, the specific structure, shape, and the like at the time of carrying out the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0062]

As described above, according to the projector of the present invention, even if vibration or the like is applied, the projection image can be prevented from shaking and the projection image can be displayed correctly.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a projector according to a first embodiment of the invention.

FIG. 2 is a diagram schematically showing an optical unit that constitutes the projector in the first embodiment.

FIG. 3 is a schematic diagram showing a state in which the projector in the first embodiment is turned upside down.

FIG. 4 is a block diagram showing a functional configuration of the projector in the first embodiment.

FIG. 5 is a diagram showing how the projector is installed on a desk and an image is projected on a screen in the first embodiment.

FIG. 6 is a block diagram showing a functional configuration of a projector according to a second embodiment of the invention.

FIG. 7 is a diagram showing how an image is projected on a screen by the projector in the second embodiment.

FIG. 8 is a block diagram showing a functional configuration of a projector according to a third embodiment of the invention.

FIG. 9 is a diagram showing an image in an image forming area of a liquid crystal panel in the third embodiment.

FIG. 10 is a diagram showing how an image is projected on a screen by the projector in the second embodiment.

[Explanation of symbols]

1, 2 and 3 Projector 4 Optical unit 10 Projector main body 20 (20A to 20D) as a device main body Four leg portions 22 (22A to 22D) as a plurality of leg portions Actuator 23 Acceleration sensor 32 as acceleration detecting means 32 Shift lens 33 Actuator 46 Projection lens 52 as a projection optical system Image display adjusting means 441R, 441G, 441B Liquid crystal panel Y as a light modulator Y image forming area

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Claims (7)

[Claims] 1. An apparatus main body including an optical system for modulating a plurality of color lights according to image information for each color light, and enlarging and projecting a combined image formed by combining the modulated light fluxes, and this apparatus. A projector including a plurality of legs that support a main body, comprising: an acceleration detecting unit that detects an acceleration of vibration applied from the outside; and a plurality of the plurality of units based on the acceleration of the vibration detected by the acceleration detecting unit. A projector comprising: a posture maintaining unit that extends and contracts at least one of the legs to maintain the posture of the device body. 2. The projector according to claim 1, wherein the acceleration detecting means is provided on each of the plurality of legs. 3. The projector according to claim 2, wherein the posture maintaining unit includes the plurality of legs and an actuator that expands and contracts each leg with respect to a support surface of the device body. Characteristic projector. 4. The projector according to claim 2, wherein the actuator expands and contracts one of the legs by an electromagnetic drive mechanism. 5. A projector having an optical system for modulating a plurality of color lights in accordance with image information for each color light, and enlarging and projecting a composite image formed by combining the modulated light beams, Acceleration detecting means for detecting the acceleration of the vibration applied from the device, and optical element attitude adjusting means for changing the position of the optical element forming the optical system based on the acceleration of the vibration detected by the acceleration detecting means. A projector comprising. 6. The projector according to claim 5, wherein the optical system includes a projection optical system that magnifies and projects the combined light, and the optical element attitude adjusting unit includes a lens that configures the projection optical system. , A projector comprising an actuator for changing the position of the lens. 7. An optical system for combining a plurality of light modulation devices for modulating a plurality of color lights according to image information and color lights emitted from the respective light modulation devices and enlarging and projecting the composite image. A projector including a system, and an acceleration detection unit that detects an acceleration of vibration applied from the outside, and an acceleration detection unit that detects an acceleration of vibration applied from the outside, based on the acceleration of the vibration detected by the acceleration detection unit. An image display adjusting means for changing an image display position, the projector.