JP2004062000A - Shift control method of projection lens, shift control mechanism of projection lens, and projector having the same - Google Patents

Abstract

Provided is a control method, a control mechanism or a device, and a projector including the mechanism or device, which enhance reliability of a shift operation of a projection lens.
In a shift control method of a projection lens for shifting a projection lens using a driving force of a driving device such as a motor, an end of a shift range of the projection lens or a movable member integrated with the lens. A sensor 500 for detecting the arrival of the projection lens 3 or the movable member 300 is arranged in the vicinity, and when the sensor 500 detects the arrival of the projection lens 3 or the movable member 300 during the shift of the projection lens 3, the speed switching is performed. Means 510 reduces the driving force of motor 400 to a predetermined value.
[Selection diagram] Fig. 4

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a position shift operation of a projection lens performed to adjust a position of a projection screen, and relates to a control method, a control mechanism or device thereof, and a projector including the mechanism or device.
[0002]
[Prior art]
In some projectors, the position of a projection lens is shifted within a certain range using a motor or the like to adjust the position of the projection screen. According to this projection screen position adjustment, the projection screen can be moved to a desired position without tilting the projector main body and while keeping the focus appropriately.
[0003]
[Problems to be solved by the invention]
However, conventionally, at the time of the shift operation of the projection lens, the stop operation at or near the end of the shift range is not always performed properly, and the load on the motor driving the projection lens is increased, or the projection lens or the projection lens is included. The movable member may bite the fixed member, and the shift mechanism of the projection lens may be damaged.
The present invention has been made in view of the above problems, and has as its object to provide a control method, a control mechanism or a device, and a projector including the mechanism or device, which enhance the reliability of a shift operation of a projection lens. .
[0004]
[Means for Solving the Problems]
The present invention employs the following configuration in order to address the above problem.
The method of the present invention is a shift control method of a projection lens that shifts a projection lens by using a driving force of a driving device, wherein a sensor disposed near an end of a shift range of the lens or a movable member integrated with the lens. Detects the arrival of the lens or the movable member, and determines the driving force of the driving device in advance when the sensor detects the arrival of the lens or the movable member during the shift of the lens. Value. As a result, the shift speed of the projection lens is reduced at the end of the shift range in which the sensor is arranged, so that at the end of the shift, the projection lens and the movable member are strongly hit against another member, for example, a fixed member and locked. Such a situation can be prevented. At the end of the shift range, the projection lens can be easily stopped at a desired position.
In the above configuration, the lens or the movable member may be stopped by being brought into contact with a fixed member at an end of the shift range. In this case, the stop position shift of the projection lens can be reliably prevented.
[0005]
Further, in the shift control method of the projection lens that shifts the projection lens by using the driving force of the driving device, the current consumption of the driving device is measured, and the measured current value becomes a predetermined current value. Then, the driving device is stopped. Thus, when an abnormality occurs, for example, when the projection lens or the movable member presses another fixed member or the like with an excessive force, the driving device is immediately stopped, and the load on the shift mechanism including the driving device is reduced. The occurrence of a failure is suppressed.
[0006]
Further, in the shift control method of the projection lens that shifts the projection lens using the driving force of the driving device, the driving time of the driving device is measured, and when the measured driving time reaches a predetermined time. Then, the driving device is stopped. As a result, when an abnormality occurs, for example, when the projection lens or the movable member presses another fixed member or the like for a longer time than necessary, the driving device is immediately stopped, and the load on the shift mechanism including the driving device is reduced. The occurrence of a failure is suppressed.
[0007]
The mechanism of the present invention is a projection lens shift mechanism including a projection lens, a movable member integrated with the projection lens, and a driving device for shifting the movable member, wherein an end of a shift range of the lens or the movable member is provided. A sensor that detects the arrival of the lens or the movable member is disposed in the vicinity of the unit, and when the sensor detects the arrival of the lens or the movable member during the shift of the lens, the driving force of the driving device is set in advance. Speed switching means for lowering to a predetermined value is provided. According to this, the shift speed is reduced at the end of the shift range where the sensor is arranged, so that at the end of the shift, the projection lens or the movable member strongly hits another fixed member or the like and is locked. Can be prevented. At the end of the shift range, the projection lens can be easily stopped at a desired position.
In the above configuration, a fixed stop member that receives the lens or the movable member may be provided at an end of the shift range. By doing so, deviation of the stop position of the projection lens can be reliably prevented.
[0008]
Further, a projection lens, a movable member integral with the lens, and a shift mechanism of the projection lens including a drive device for shifting the movable member, an ammeter for measuring a current consumption of the drive device is arranged, When the current value measured by the ammeter becomes a predetermined current value, a stop means for stopping the driving device is provided. According to this, in an abnormal case, for example, when the projection lens or the movable member presses another fixed member or the like with an unnecessary force, the driving device is immediately stopped, and the load on the shift mechanism including the driving device is reduced. The occurrence of a failure is suppressed.
[0009]
Further, in a projection lens, a movable member integrated with the projection lens, and a shift mechanism of the projection lens including a drive device for shifting the movable member, a timer for measuring a drive time of the drive device is disposed, When the driving time measured by the timer has reached a predetermined time, a stop means for stopping the driving device is provided. According to this, in an abnormal case, for example, when the projection lens or the movable member presses another fixed member or the like for a longer time than necessary, the driving device is immediately stopped, and the load on the shift mechanism including the driving device is reduced. The occurrence of a failure is suppressed.
[0010]
It should be noted that a mechanism combining the configuration using the sensor and the configuration using the ammeter, or a mechanism combining the configuration using the sensor and the configuration using the timer may be used. By doing so, a projection lens shift mechanism with further improved reliability can be obtained.
[0011]
Further, an illumination light source system including a light source and a unit for equalizing an irradiation state of light emitted from the light source, and a color separation optical system for separating the light emitted from the illumination light source system into a predetermined color light And a light modulator that modulates each color light from the color separation optical system in accordance with image information, and a projection lens that projects light modulated by the light modulator, wherein the projection lens is , Each of the above-described projection lens shift mechanisms. Thus, a highly reliable projector that can easily adjust the projection position can be provided.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
(overall structure)
FIG. 1 is a block diagram showing a main configuration of a projector according to an embodiment of the present invention. The projector 1 includes an illumination lamp 11, a color light separation optical system 12 that separates illumination light from the lamp 11 into red (R), green (G), and blue (B) light, and each of the separated color lights. The liquid crystal panels 13R, 13G, and 13B as light modulation devices that display images in accordance with predetermined image information, a cross dichroic prism 14 that synthesizes images generated by these liquid crystal panels, and an image synthesized by the cross dichroic prism 14 Is provided with a projection lens 3 for projecting light.
[0013]
Further, in this projector, the projection lens 3 is provided with a certain range from the optical axis center of the liquid crystal panels 13R, 13G, 13B and the cross dichroic prism 14 so that the position of the projection screen on a screen or the like can be adjusted in the vertical direction. It is configured to be able to shift (or move). The shift width is determined as appropriate, but can be, for example, 10 mm in the vertical direction, and the shift operation is performed by combining a power drive source such as a motor and a power transmission mechanism such as a gear mechanism. be able to. Here, the shift operation of the projection lens 3 is performed by the motor 400, and the motor 400 is driven by the motor drive circuit 400A.
[0014]
The projector 1 also cools a lamp driving circuit 11A that drives the lamp 11, an image processing circuit 13A that supplies image information to the liquid crystal panels 13R, 13G, and 13B, and the lamp 11 and / or the liquid crystal panels 13R, 13G, and 13B. Fan 15, a fan drive circuit 15A for driving the fan 15, a speaker 16 for outputting sound, a sound processing circuit 16A for supplying sound information to the speaker 16, and a control unit for inputting control information and display data to the projector 1. A user interface 17 including an input device, a central processing unit (CPU) 18 for performing various calculations, determinations and controls, a volatile memory 19 for temporarily storing data required for performing calculations and determinations, and a CPU 18 are provided. Can read various programs and various data to perform predetermined operation using Nonvolatile memory 20 that retains stored in, and takes in the commercial power supply and the like transformers it to a usable state comprising a power supply circuit 22 supplies power necessary for each circuit or device in the projector 1.
[0015]
The projector 1 is further arranged at a predetermined position in the shift range of the projection lens 3 to detect a position of the projection lens 3, a sensor 500, an ammeter 600 for measuring current consumption of the motor 400, and a driving time of the motor 400. A timer 700 for measuring is provided.
The lamp driving circuit 11A, the image processing circuit 13A, the fan driving circuit 15A, the audio processing circuit 16A, the user interface 17, the memories 19 and 20, the motor driving circuit 400A, and the like are controlled by the CPU 18.
[0016]
(Projection lens shift mechanism)
FIG. 2 is a perspective view showing a projection lens mounting portion of the projector according to the embodiment of the present invention. Here, the projection lens 3 is attached to a substantially L-shaped prism and an upright wall 110 of the projection lens attachment plate 100 via a fixing member 200. That is, a fixing member 200 constituting a projection lens shift mechanism is fixed to the vertical wall 110 of the prism and the projection lens mounting plate 100, and a movable member ( 2, which is not visible because it is inside the fixing member 200). The projection lens 3 is attached to the movable member, and the movable member and the projection lens 3 are integrated.
[0017]
On the other hand, a cross dichroic prism 14 on which liquid crystal panels 13R, 13G, and 13B are integrally mounted is fixed to a horizontal plane 120 of the prism and projection lens mounting plate 100. The prism and the projection lens mounting plate 100 are fixed to an optical element fixing member (not shown) fixed inside the case of the projector 1 called a light guide with screws or the like.
[0018]
FIG. 3 is a front view of the structure of FIG. 2 as viewed from the front of the projection lens 3 and shows a mechanical structure for shifting the projection lens 3. In FIG. 3, the projection lens fixing fastening section 310 shown in FIG. 2 is omitted. As shown in FIG. 3, a motor 400 is mounted on the fixed member 200 as a drive source for shifting the movable member 300 including the projection lens 3. The rotation of the motor 400 is transmitted to the rotation shaft 403 via the gears 401 and 402. The rotation of the rotation shaft 403 is transmitted to a slide member 404 which meshes with the rotation shaft 403 and slides according to the rotation. The slide member 404 is connected and fixed to a part 301 of the movable member 300, and the movable member 300 shifts up and down in accordance with the slide of the slide member 404. Further, guide shafts 202L and 202R are passed vertically to the left and right side surfaces of the fixed member 200, and left and right support portions 302L and 302R of the movable member 300 are fitted to the guide shafts 202L and 202R, respectively. Thus, the projection lens 3 and the movable member 300 can be slid up and down along the guide shafts 202L and 202R without tilting. Note that the power transmission mechanism (in FIGS. 4 to 6, denoted by reference numeral 410) including the gears 401 and 402, the rotating shaft 403, and the slide member 404 shown here is merely an example, and various other types are available. Needless to say, the power transmission mechanism of the embodiment can be used.
[0019]
Further, a sensor 500 for detecting that the projection lens 3 or the movable member 300 has arrived due to the shift is disposed near the end of the shift range of the projection lens 3 or the movable member 300. Here, the sensor 500 is arranged in the shift passage of the movable member 300. Various types of sensors can be used as the sensor 500. For example, a microswitch, an optical switch using light transmission / blocking, or the like can be used. The term "near the end of the shift range" means a part slightly inside from the end of the shift range, which may be determined as appropriate. %, Preferably within a range of about 20 to 10% of the shift amount.
[0020]
The shift operation of the movable member 300 including the projection lens 3 can be operated by a switch provided on the projector main body or its remote controller. For example, when the switch is turned on, the motor 400 is driven to move the movable member 300 including the projection lens in the shift range. When the switch is turned off, the motor 400 is stopped and the movable member 300 Movement stops.
[0021]
(Shift control of projection lens)
Next, a specific control example of the shift operation of the projection lens 3 will be described.
[0022]
Example 1
FIG. 4 is a block diagram showing an example of the projection lens shift mechanism according to the present invention. Here, the number of rotations of the motor 400 for shifting the projection lens 3 and the movable member 300 is set to two types according to the situation. That is, when the movable member 300 is moved from the sensor 500 on one end to the sensor 500 on the other end, and when the movable member 300 is moved from the sensor 500 to the end of the shift range. And two types. The rotation speed of the motor from the sensor 500 to the end of the shift range is set lower than the rotation speed in the shift range from the sensor 500 on one end to the sensor 500 on the other end. It is preferable that the rotation speed be such that it can be stopped at any time without adversely affecting the members. In the following, the rotation speed of the motor 400 within the shift range between the sensor 500 at one end and the sensor 500 at the other end is referred to as the movement mode rotation speed, and the rotation of the motor 400 from the sensor 500 to the end of the shift range. The number will be referred to as stop mode speed.
[0023]
Here, when the sensor 500 detects the arrival of the projection lens 3 or the driving member 300 during the shift of the projection lens 3 and the movable member 300, the sensor 500 acts on the motor driving circuit 400A to rotate the motor 400 (or drive the motor 400). Force) is set to reduce the force) to a predetermined value. This speed switching means 510 can be constituted by a program stored in the nonvolatile memory 20, or by a relay circuit or the like.
[0024]
Subsequently, a shift operation of the projection lens 3 according to the configuration of the first embodiment will be described. While the motor 400 is driven by the motor drive circuit 400A and the movable member 300 is moving, the sensor 500 monitors the arrival of the movable member 300 at the end of the shift range. Then, when the sensor 500 detects the arrival of the movable member 300, the speed switching means 510 switches the rotation speed of the motor 400 from the movement mode rotation speed to the stop mode rotation speed, and the moving speed of the movable member 300 is reduced. Reduce the speed at which it can be stopped at any time without adversely affecting other members. Thereafter, the movable member 300 moves and stops until the shift switch is turned off or the shift range ends.
[0025]
Note that a stop portion 202 facing the movable member 300 is formed at a position of the fixed member corresponding to the end of the shift range of the projection lens 3 and the movable member 300, and a part of the projection lens 3 or the movable member 300, for example, It is preferable that the left and right support portions 302L and 302R abut against the stop portion 202 so that the movable member 300 does not slide beyond the stop portion 202. Further, the motor 400 may be automatically stopped by detecting the contact between the movable member 300 and the stop portion 202.
[0026]
Example 2
FIG. 5 is a block diagram showing another example of the projection lens shift mechanism according to the present invention. Here, when the current consumption of the motor 400 that shifts the projection lens 3 and the movable member 300 reaches a predetermined value, the setting is made to act on the motor drive circuit 400A to stop the power supply to the motor 400. And a motor stopping means 610. This motor stopping means 610 can be constituted by a program stored in the nonvolatile memory 20, or by a relay circuit or the like.
[0027]
The shift operation of the projection lens 3 according to the configuration of the second embodiment can be performed, for example, as follows. While the motor 400 is being driven by the motor drive circuit 400A, the current consumption of the motor 400 is monitored by the ammeter 600. If the monitored current consumption becomes a predetermined value, for example, a current value that is determined to be beyond the normal shift operation range of the projection lens 3 and the movable member 300, the motor The power supply to the motor 400 is stopped, and the driving of the motor 400 is stopped. According to this, by setting the above-mentioned predetermined value to an appropriate current value, abnormalities in the shift operation and overload of the motor 400 can be found at an early stage, so that breakage and damage of the shift mechanism can be prevented. Become.
In FIG. 5, the current value measurement by the ammeter 600 is performed by accessing the motor drive circuit 400A. However, the current consumption of the motor may be measured by accessing the motor 400.
[0028]
Example 3
FIG. 6 is a block diagram showing still another example of the projection lens shift mechanism according to the present invention. Here, when the drive time of the motor 400 that shifts the projection lens 3 and the movable member 300 (the time during which the motor is driven) reaches a predetermined value, the motor operates on the motor drive circuit 400A to operate the motor. There is provided a motor stopping means 710 set to stop supplying power to the motor 400. This motor stopping means 710 can be constituted by a program stored in the nonvolatile memory 20, or by a relay circuit or the like.
[0029]
The shift operation of the projection lens 3 according to the configuration of the third embodiment can be performed, for example, as follows. As shown in FIG. 6, the time during which the motor 400 is driven by the motor drive circuit 400A is monitored by a timer 700. Then, when the monitored time has passed a predetermined value, for example, when the time required for the projection lens 3 to be required from the center position of the shift range to the end of the shift range has elapsed, Then, the power supply to the motor 400 is stopped, and the driving of the motor 400 is stopped. According to this, by setting the above-mentioned predetermined value to an appropriate time width, it is possible to prevent a shift operation abnormality and an overload of the motor 400 from occurring, and thus it is possible to avoid breakage or damage of the shift mechanism. Become.
In FIG. 6, the time measurement by the timer 700 is performed by accessing the motor drive circuit 400A. However, the motor 400 may be accessed to measure the drive time of the motor.
[0030]
By the way, the control examples of the projection lens shift operation have been individually introduced as the first to third embodiments. However, the operations of the first and second embodiments or the operations of the first and third embodiments are combined. It is good also as composition which also has the characteristic of. By doing so, the reliability of the projection lens shift mechanism can be further improved.
[0031]
(Image projection by projector)
Finally, the image projection operation of the projector 1 will be briefly described. In the projector 1, when the lamp switch 4 is turned on, the lamp 11 is turned on by the lamp driving circuit 11A. Then, the illumination light from the lamp 11 is separated into red (R), green (G), and blue (B) color lights by the color light separation optical system 12, and each of the separated color lights corresponds to each of the RGB signals of the image. Irradiate the provided liquid crystal panels 13R, 13G, and 13B. Then, an image based on the data supplied from the image processing circuit 13A is displayed on the liquid crystal panels 13R, 13G, and 13B, and the images of the respective liquid crystal panels are synthesized by the cross dichroic prism 14, and the synthesized image is projected onto the projection lens 3 From the projector to a screen or the like. In addition, a sound is output from the speaker 16 in accordance with the sound information from the sound processing circuit 16A in accordance with the image display. Note that while the lamp switch 4 is turned on and the lamp 11 is lit, the fan drive circuit 15A is automatically controlled by the CPU 18 or the like in accordance with the temperature inside the projector. The inside is maintained at a temperature equal to or lower than a predetermined value.
[0032]
As described above, the present invention has been specifically described. However, the present invention is not limited to the above-described embodiments or examples, and can be implemented in various modes without departing from the gist thereof. The following modifications are also possible.
(1) In the above embodiment, the projection lens 3 is vertically shifted around the optical axes of the liquid crystal panels 13R, 13G, 13B and the cross dichroic prism 14, but the projection lens 3 is moved with respect to the optical axis. It is also possible to adopt a configuration in which the shift is performed only in the upward or downward direction.
(2) A dichroic mirror, a dichroic prism, a color filter, or the like can be used as the color light separation unit or the spectral unit used for the color light separation optical system 12.
(3) Although an example using a liquid crystal panel as the light modulation device has been described, besides, a mirror type light modulation element, a ferroelectric liquid crystal, an antiferroelectric liquid crystal, a π cell mode liquid crystal, a TN liquid crystal, an OCB mode The present invention can be applied to a projector using a modulation device constituted by liquid crystal or the like.
(4) Also, the example of the projector using three light modulation devices has been described, but the present invention can also be applied to a projector using one, two, or three or more light modulation devices.
(5) The present invention can be applied not only to the projector using the transmissive light modulator described in the embodiment, but also to a projector using a reflective light modulator. Here, “transmission type” means that the light modulation device transmits light, and “reflection type” means that the light modulation device reflects light. ing.
(6) Further, as the projector, there are a front projector that projects an image from a direction in which the projection surface is observed, and a rear projector that projects an image from a side opposite to the direction in which the projection surface is observed. It is applicable to any of the above.
[0033]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the method and mechanism of this invention, the reliability of the shift operation | movement of a projection lens performed for projection image position adjustment improves. Therefore, the reliability of the projector including the mechanism is improved as a whole.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an overall configuration of a projector according to an embodiment of the invention.
FIG. 2 is a perspective view showing a projection lens mounting portion of the projector according to the embodiment of the present invention.
FIG. 3 is a front view of the structure of FIG. 2 when viewed from the front of the projection lens, showing a mechanical structure for shifting the projection lens.
FIG. 4 is a block diagram showing an example of a projection lens shift mechanism according to the present invention.
FIG. 5 is a block diagram showing another example of the projection lens shift mechanism according to the present invention.
FIG. 6 is a block diagram showing still another example of the projection lens shift mechanism according to the present invention.
[Explanation of symbols]
Reference Signs List 1 projector 3 projection lens 100 prism and projection lens mounting plate 200 fixed member 300 movable member 400 motor 400A motor drive circuit 500 sensor 510 speed switching means 600 ammeter 610 motor stopping means 700 timer 710 motor stopping means

Claims (11)

In a shift control method of a projection lens for shifting a projection lens using a driving force of a driving device,
A sensor disposed near an end of a shift range of the lens or the movable member integrated with the lens detects an arrival of the lens or the movable member, and the sensor detects the arrival of the lens during the shift of the lens. A shift control method for a projection lens, characterized in that when the arrival of a lens or the movable member is detected, the driving force of the driving device is reduced to a predetermined value. The shift control method for a projection lens according to claim 1, wherein the lens or the movable member is stopped by being brought into contact with a fixed member at an end of the shift range. In a shift control method of a projection lens for shifting a projection lens using a driving force of a driving device,
A shift control method for a projection lens, comprising: measuring a current consumption of the driving device; and stopping the driving device when the measured current value reaches a predetermined current value. In a shift control method of a projection lens for shifting a projection lens using a driving force of a driving device,
A shift control method for a projection lens, comprising: measuring a driving time of the driving device; and stopping the driving device when the measured driving time reaches a predetermined time. A projection lens, a movable member integrated with the projection lens, and a shift mechanism of the projection lens including a driving device for shifting the movable member,
A sensor that detects the arrival of the lens or the movable member is disposed near the end of the shift range of the lens or the movable member,
When the sensor detects the arrival of the lens or the movable member during the shift of the lens, a speed switching unit that reduces a driving force of the driving device to a predetermined value is provided. Lens shift control mechanism. The shift control mechanism for a projection lens according to claim 5, wherein a fixed stop member that receives the lens or the movable member is disposed at an end of the shift range. A projection lens, a movable member integral with the lens, and a shift mechanism of the projection lens including a driving device for shifting the movable member,
Arrange an ammeter to measure the current consumption of the driving device,
A shift control mechanism for a projection lens, comprising: stopping means for stopping the driving device when a current value measured by the ammeter reaches a predetermined current value. A projection lens, a movable member integrated with the projection lens, and a shift mechanism of the projection lens including a driving device for shifting the movable member,
A timer for measuring the driving time of the driving device is arranged,
A shift control mechanism for a projection lens, comprising: stopping means for stopping the driving device when the driving time measured by the timer reaches a predetermined time. An ammeter for measuring the current consumption of the driving device is provided, and when the current value measured by the ammeter reaches a predetermined current value, a stopping unit for stopping the driving device is provided. 7. A shift control mechanism for a projection lens according to claim 5, wherein: A timer for measuring a driving time of the driving device is provided, and a stop unit for stopping the driving device when the driving time measured by the timer reaches a predetermined time is provided. A shift control mechanism for a projection lens according to claim 5. A light source, and an illumination light source system including means for equalizing an irradiation state of light emitted from the light source,
A color separation optical system that separates light emitted from the illumination light source system into predetermined color light,
A light modulator that modulates each color light from the color separation optical system in accordance with image information;
A projector having a projection lens that projects light modulated by the light modulation device,
A projector, comprising: the projection lens shift control mechanism according to claim 5.

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