JPH1195324A - Projector capable of easily adjusting picture size - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector constituted so that the display picture size of the projector installed at an optional distance from a screen can be easily set just by selecting the menu of the display picture. SOLUTION: A projection screen size is inputted in a screen size input part 1. A screen distance detection means 2 detects a distance from the projector to the screen. A zoom ratio computing element 4 computes the zoom ratio of a zoom lens based on the distance to the screen which is stored in a data memory 2 and the screen size. A zoom driving motor 8, a zoom control part 6 and a zoom driving part 7 drive the zoom lens. A zoom ratio detection means 9 detects the mechanical zoom ratio of the zoom lens. A comparator 5 compares the zoom ratio detected by the means 9 with the zoom ratio computed and outputted by the computing element 4 and computes and outputs a difference between them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple method for setting a screen size on a screen when a projector using a zoom lens is arbitrarily installed.

[0002]

2. Description of the Related Art Output light from a light source is condensed by an optical system, light-modulated by an LCD (liquid crystal display element) having an optical shutter converted and driven by an input image signal, and enlarged by a projection zoom lens system. A mobile installation type projector that outputs and displays and outputs a projection image on a screen is installed in various places, and the number of users of the projector is unspecified. There are usage forms in which the distance to the screen to be installed and the screen size change each time, and the display screen is not a specific one and may be a white wall or a white board. Each time the user turns the projector to the screen, the optical axis, focus, screen size,
Make adjustments such as brightness. When the screen is a white wall, a white board, a huge screen, or the like, there is no target as a guide for the screen size, and setting is difficult.

[0003]

In view of the above problems,
An object of the present invention is to provide a projector that can easily set the display screen size of a project installed at an arbitrary distance from a screen simply by selecting a menu on the display screen.

[0004]

An output light from a light source is condensed by an optical system, is optically modulated by an LCD or the like having an optical shutter converted and driven by an input image signal, and is enlarged and output by a projection zoom lens system. In a projector for displaying and outputting a projection image on a screen, a screen size input unit for inputting a projection screen size, a unit for detecting a distance between the projector and the screen, and a distance between the input screen size and the detected screen. Memory, a zoom ratio calculator for calculating the zoom ratio of the zoom lens from the distance to the screen and the screen size stored in the data memory, a zoom drive motor for driving the zoom lens, and a zoom ratio calculator Zoom control that controls the zoom drive motor to achieve the calculated zoom ratio A zoom drive unit that drives the zoom drive motor with a zoom control unit output, a zoom ratio detection unit that detects a mechanical zoom ratio of a zoom lens, and a zoom ratio and zoom ratio calculator that is detected by the zoom ratio detection unit. It comprises a comparator that compares the calculated and output zoom ratio and calculates and outputs the difference.

Further, a screen size input section is provided with an operation input section provided in the projector main body, a selection menu memory storing selection menu data of the screen size of the projector, and a selection menu on the display screen of the projector. A display control section for generating a display signal to be displayed, or a remote control input section for inputting a remote control signal by infrared or weak radio wave means from a remote control input section external to the apparatus, and storing menu data for selecting a screen size of the projector. And a display control unit that generates a display signal for displaying the selected menu on the display screen of the projector.

[0006] Further, the screen distance detecting means is used as an input means by a manual operation from an operating section provided on a projector main body or a remote controller, or a focus position detector for detecting a mechanical focus adjustment position of a zoom lens. And a screen position calculator for calculating and outputting the distance from the detected focus adjustment position to the screen.

Further, the focus position detector is a rotation sensor for detecting the rotation angle of the focus adjustment drive shaft or a linear sensor for detecting the sliding amount of the focus adjustment drive shaft in the linear direction.

Alternatively, the screen distance detecting means includes a timing pulse generator for generating a periodic timing pulse, a modulator for modulating an ultrasonic carrier wave with the timing pulse, and an ultrasonic output signal for outputting an ultrasonic modulation signal to the screen. Ultrasonic output element, a driving unit that drives the ultrasonic output element with an ultrasonic carrier wave, an ultrasonic receiving element such as a microphone that receives a reflected sound from a screen and converts it into a received signal, and linearly detects the received signal. A detector for demodulating the reception timing pulse, a time difference calculator for calculating and outputting the time difference between the timing pulse and the reception-detected reception timing pulse, and a distance calculator for calculating and outputting the distance from the time difference calculation output to the screen. It consists of. Further, a repeater is added which converts the ultrasonic output sound into a received signal instead of the reflected sound from the screen, amplifies the received signal, and retransmits it as an ultrasonic sound from the ultrasonic output element again.

Further, the ultrasonic output element is an ultrasonic speaker or a ceramic electrostrictive element which generates ultrasonic attenuation vibration when an electric signal is applied.

[0010] Further, the zoom control unit is provided with a polarity switch for switching the polarity of the voltage supplied to the DC motor for driving the zoom ratio, and a controller for controlling the output by a comparator output signal, or stepping for driving the zoom ratio. A polarity switch that switches the polarity of the voltage supplied to the motor, a drive pulse table that stores the relationship between the zoom ratio calculation output and the number of steps of the stepping motor, and a drive pulse that is required from the drive pulse table based on the zoom ratio calculation output And a drive pulse generator for generating numbers.

Further, the zoom ratio detecting means is a rotation sensor for detecting the rotation angle of the zoom ratio adjusting drive shaft or a linear sensor for detecting the linear sliding amount of the zoom ratio adjusting drive shaft.

[0012]

FIG. 1 is a block diagram of a main part of an embodiment of a projector according to the present invention, FIG. 2 is a detailed block diagram of a screen size input unit according to the present invention, and FIG. FIG. 4 is a block diagram of an embodiment of a zoom control unit according to the present invention.
FIG. 5 is an embodiment of a menu screen according to the present invention. After the installation of the projector is completed, the user first adjusts the optical axis and adjusts the focus using the operation unit 11 while viewing the menu screen shown in FIG. To adjust the screen display size, a desired size is selected and input from the menu screen (FIG. 5) using the screen size input unit 1. The screen size data selected and input is stored in the data memory 3.
Is temporarily stored. On the other hand, the distance to the screen is detected and output as distance data by the screen distance detecting means 2 and is temporarily stored in the data memory 3. The zoom ratio calculator 4 calculates and outputs a zoom ratio of a zoom lens having a predetermined screen size based on both data. Based on the calculated and output zoom ratio data, the zoom controller 6 generates a control signal for controlling the motor 8 that drives the zoom ratio mechanism of the zoom lens 10, and inputs the control signal to the zoom driver 7. The zoom lens 10 is provided with a zoom ratio detecting means 9 for mechanically and indirectly detecting the ratio, and the zoom ratio data from the zoom ratio detecting means 9 is output from the zoom ratio calculator 4 by the comparator 5. A comparison operation is performed with the zoom ratio data. The result of this comparison operation is fed back to the zoom control 6, and a zoom control voltage is output until the difference becomes zero. Reference numeral 12 denotes a system memory, which stores an operation sequence program of the apparatus, and a control unit 13 controls the entire apparatus according to the operation sequence program.

In FIG. 2, the screen size setting input is a screen size selection screen data as shown in FIG.
The data is read from the selection menu memory 1b storing the data, and is generated by the display control unit 1c. In (a),
The screen size is selected and input by an icon operation from an operation input unit 1a attached to the main body. In (b), the remote control input unit 1d receives and inputs an operation input signal from the remote control device by infrared or weak radio wave means or the like.

FIG. 3 shows various types of screen distance detecting means. (A) focuses on the focus adjustment mechanism of the zoom lens, and calculates the distance to the screen from the focus adjustment position of the optical mechanism system. In the focus adjustment, the drive of the focus adjustment drive motor 15 is controlled by the focus drive unit 14. The motor 1
The drive shaft 5 is decelerated by a gear or the like, and rotationally drives or linearly slides the focus adjustment mechanism of the zoom lens.
The focus position (correlation with the distance to the screen) of the lens is proportional to the rotation angle of the rotation drive or the amount of linear sliding. This focus position is detected and output as focus position data by the focus position detector 2a. The focus position detector 2a employs a rotation sensor system or a linear sensor system in accordance with the focus adjustment mechanism. The screen position calculator 2b is
Screen position data is calculated and output based on a correlation function between the focus position data unique to the zoom lens focus adjustment mechanism and the distance to the screen.

[0015] (b) simply and automatically measures the distance to the screen S using ultrasonic waves. The timing pulse generation unit 21 performs the operation for 10 msec at a cycle of 100 msec.
A pulse signal of c width is generated. The modulation unit 22 modulates a carrier of 40 kHz from an ultrasonic oscillator (not shown) with the pulse signal, and outputs the modulated signal to the driving unit 23. Drive unit 23
Drives an ultrasonic output device 24 such as an ultrasonic speaker or an electrostrictive ceramic to emit an ultrasonic signal toward the screen S. The reflected sound from the screen S is converted into a reception signal by an ultrasonic receiving element such as an ultrasonic microphone and output. After the received signal is amplified by the amplifier 26,
The signal is linearly detected by the detector 27 to generate a reception timing pulse. The time difference calculator 28 calculates and outputs time difference data between the reception timing pulse and the timing pulse from the timing pulse generator 21. The distance calculator 29 is
1/2 value of the time difference data and sound velocity of approximately 34 in the standard space
The distance to the screen is calculated and output by the product of 0 m / sec. Further, in (c), in case the reflection by the screen is insufficient, the ultrasonic repeater 30 having the function of receiving and retransmitting the ultrasonic wave is temporarily installed near the screen, and the role of the ultrasonic wave reflection plate is provided. Was held.

FIG. 4A shows the configuration of a zoom control unit when a general DC motor is used as the zoom ratio adjusting drive motor 8. The zoom ratio calculation output from the zoom ratio calculator 4 is input to the controller 62. A DC power supply is connected to the controller 62, and the output voltage is controlled by the arithmetic output. On the other hand, the polarity switch 62 is
Based on the comparison output data, the polarity of the output voltage to the zoom drive unit 7 and ON / OFF control are performed. This control
When the zoom ratio calculation output is larger than the zoom ratio detection output, the polarity for rotating the motor in the forward direction is selected. When the output is smaller, the polarity for rotating the motor in the reverse direction is selected. State.

(B) shows the configuration of the zoom control unit when a stepping motor that rotates by a fixed angle for each pulse input is used as the zoom ratio adjusting drive motor 8. The drive pulse generator 63 reads out the corresponding pulse number from a drive pulse table storing the relationship between the zoom ratio and the drive pulse number based on the zoom ratio calculation output from the zoom ratio calculator 4 and outputs the drive pulse. . On the other hand, the polarity switch 62
Performs the polarity and ON / OFF control of the output voltage to the zoom drive unit 7 based on the comparison output data from the comparator 5.
In this control, when the zoom ratio calculation output is larger than the zoom ratio detection output, the polarity that causes the motor to rotate in the normal direction is selected, and when the output is smaller, the polarity that causes the motor to rotate in the reverse direction is selected. When it reaches zero, it is left open.

[0018]

The present invention is embodied in the form described above, and has the following effects. By comprising a screen size input unit, a data memory, a zoom ratio calculator, a zoom drive motor, a zoom control unit, a zoom drive unit, a zoom ratio detection unit, and a comparator,
When the desired screen size is input from the screen size input unit, the zoom ratio calculator calculates and outputs the zoom ratio of the zoom lens with the distance to the screen detected by the screen distance detecting means. The zoom ratio of the lens could be controlled. Further, as a result of the automatic measurement of the screen distance, the present invention provides a project that can easily set the display screen size of a project installed at an arbitrary distance from the screen simply by selecting a menu on the display screen. I was able to do it.

[Brief description of the drawings]

FIG. 1 is a main part block diagram of an embodiment of a projector according to the present invention.

FIG. 2 is a detailed block diagram of a screen size input unit according to the present invention.

FIG. 3 is a block diagram of an embodiment of a screen distance detecting means according to the present invention.

FIG. 4 is a block diagram of an embodiment of a zoom control unit according to the present invention.

FIG. 5 is an embodiment of a menu screen according to the present invention.

[Explanation of symbols]

 S screen 1 Zoom ratio calculator 1a Operation input unit 1b Selection menu memory 1c Display control unit 1d Remote control input unit 2 Screen distance detecting means 2a Focus position detector 2b Screen position calculator 3 Data memory 4 Zoom ratio calculator 5 Comparator 6 Soom control unit 7 Zoom drive unit 8, 15 Motor 9 Zoom ratio detector 11 Operation unit 21 Timing pulse generation unit 22 Modulation unit 23 Drive unit 24 Ultrasonic output element 25 Ultrasonic reception element 27 Detector 28 Time difference calculator 29 Distance calculation Unit 30 Ultrasonic repeater 61 Polarity switch 62 Controller 63 Drive pulse generator 64 Drive pulse table

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI H04N 5/74 G02B 7/11 N

Claims (15)

[Claims] 1. An optical system comprising an optical shutter which condenses output light from a light source by an optical system and converts and drives the converted light according to an input image signal.
In a projector that is light-modulated by a CD (liquid crystal display element) or the like, magnified by a projection zoom lens system, and outputs a projection image on a screen, a screen size input unit for inputting a projection screen size, the projector and the screen Screen distance detecting means for detecting a distance to the screen, a data memory for temporarily storing the input screen size and the distance to the detected screen, a distance to the screen and a screen size stored in the data memory. A zoom ratio calculator for calculating the zoom ratio of the zoom lens, a zoom drive motor for driving the zoom lens, and a zoom for controlling the zoom drive motor to obtain the zoom ratio calculated and output by the zoom ratio calculator. A control unit and the zoom control unit outputs A zoom drive unit that drives a zoom drive motor, a zoom ratio detection unit that detects a mechanical zoom ratio of a zoom lens, a zoom ratio detected by the zoom ratio detection unit, and a zoom calculated and output by the zoom ratio calculator. When a desired screen size is input from the screen size input unit, the zoom ratio calculator calculates the screen detected by the screen distance detection unit. A zoom ratio of the zoom lens is calculated and output based on the distance to the zoom lens, and the zoom ratio of the zoom lens is controlled by the calculated zoom ratio output. 2. The projector according to claim 1, wherein the screen size input unit is an operation input unit provided in the projector main body, a selection menu memory storing selection menu data of a screen size of the projector, and the selection menu is stored in the projector. 2. A simple screen size according to claim 1, further comprising a display control unit for generating a display signal to be displayed on the display screen, and selectively inputting a desired display screen size of the projector on the projector display screen. Adjustable projector. 3. The screen size input section stores a remote control input section for inputting a remote control signal by infrared or weak radio wave means from a remote control input section outside the apparatus, and menu data for selecting a screen size of the projector. A selection menu memory; and a display control unit for generating a display signal for displaying the selection menu on the display screen of the projector, wherein a desired display screen size of the projector is selectively input on the projector display screen. The simple screen size adjustment projector according to claim 1. 4. The simple screen size adjusting projector according to claim 1, wherein said screen distance detecting means is input means by manual operation from an operating section provided on said projector main body or a remote controller. . 5. A focus position detector for detecting a mechanical focus adjustment position of the zoom lens, and a screen position calculator for calculating and outputting a distance from the detected focus adjustment position to a screen. 2. The simple screen size adjustment projector according to claim 1, wherein the distance to the screen is calculated and output from the mechanical focus adjustment position of the zoom lens. 6. The simple screen size adjustment projector according to claim 5, wherein said focus position detector is a rotation sensor for detecting a rotation angle of a focus adjustment drive shaft. 7. The simple screen size adjusting projector according to claim 5, wherein said focus position detector is a linear sensor for detecting a sliding amount of a focus adjusting drive shaft in a linear direction. 8. A timing pulse generator for generating a periodic timing pulse, said screen distance detecting means comprising:
A modulator that modulates an ultrasonic carrier with the timing pulse, an ultrasonic output element that outputs the ultrasonic modulation signal toward the screen, and a driver that drives the ultrasonic output element with the ultrasonic carrier An ultrasonic receiving element such as a microphone that receives a reflected sound from the screen and converts it into a received signal, a detector that linearly detects the received signal, and demodulates a reception timing pulse, and the timing pulse and the reception detection. 2. The simplified screen size according to claim 1, comprising a time difference calculator for calculating and outputting a time difference from the received reception timing pulse, and a distance calculator for calculating and outputting a distance from the time difference calculation output to a screen. Adjustable projector. 9. An ultrasonic repeater for converting the ultrasonic output sound into a received signal instead of the reflected sound from the screen, amplifying the received signal, and retransmitting it as an ultrasonic sound from the ultrasonic output element again. The simple screen size adjustment projector according to claim 8, wherein: 10. The projector according to claim 8, wherein said ultrasonic output element is an ultrasonic speaker. 11. The simple screen size adjusting projector according to claim 8, wherein said ultrasonic output element is a ceramic electrostrictive element which generates ultrasonic attenuation vibration when an electric signal is applied. 12. A zoom control unit comprising: a polarity switch for switching the polarity of a voltage supplied to a DC motor for driving the zoom ratio; and a controller for controlling the output by the comparator output signal. The simple screen size adjustment projector according to claim 1. 13. A zoom control unit, comprising: a polarity switch for switching the polarity of a voltage supplied to a stepping motor for driving the zoom ratio; and a relationship between the zoom ratio calculation output and the number of steps of the stepping motor. With the driving pulse table and the zoom ratio calculation output,
The simple screen size adjusting projector according to claim 1, further comprising a driving pulse generator that reads a required number of driving pulses from the driving pulse table and generates a driving pulse. 14. The simple screen size adjusting projector according to claim 1, wherein said zoom ratio detecting means is a rotation sensor for detecting a rotation angle of a zoom ratio adjusting drive shaft. 15. The simple screen size adjusting projector according to claim 1, wherein said zoom ratio detecting means is a linear sensor for detecting a linear sliding amount of a zoom ratio adjusting drive shaft.