JPS62125790A - Deflection correcting device for multitube type projector - Google Patents

Abstract

PURPOSE:To obtain a large size color video screen without a distortion of the picture, only by adjusting a focusing lens by adjusting the respective focusing lenses of the respective tubes of a multitube type projector by a motor and changing the quantity of correcting a deflecting distortion of the respective tubes according to a control signal to the motor. CONSTITUTION:The projector is constituted by using the three tubes of a red color cathode ray tube 1R, a green color cathode ray tube 1G and a blue color cathode ray tube 1B. The red color, the green color and the blue color video screens obtained in the red color, the green color and the blue color cathode ray tubes 1R, 1G and 1B are overlapped and projected on a screen 3 through the lens systems 2R, 2G and 2B, respectively. Respective forward and backward, lateral and vertical control signals S1, S2 and S3 from control voltage generating sources 5R, 5G and 5B are supplied to a deflecting distortion correcting signal forming circuit 6. Respective horizontal and vertical subdeflecting yokes as well as horizontal and vertical main deflecting yokes are provided in the red color, the green color and the blue color cathode ray tubes 1R, 1G and 1B, respectively to correct the deflecting distortion.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a deflection correction device for a multi-tube projector used in a projector that projects a single television image onto a screen so that a large image can be viewed. .

[Summary of the invention]

The present invention provides a deflection correction device for a multi-tube projector used in a projector that projects a television image onto a screen so that a large image can be viewed. This is done by each motor, and the deflection distortion correction amount of each tube is changed according to the control signal to the motor, so that a good projected image can be obtained even if the distance, angle, etc. between the screen and the projector are arbitrarily changed. The projector and screen can be easily installed at any desired location.

[Conventional technology]

Generally, a color projector (1) uses three tubes: a red cathode ray tube (IR), a green cathode ray tube (IG), and a blue cathode ray tube (IB), as shown in Figure 6. The red, green and blue image screens obtained in IR), (IG) and (IB) are respectively
2R), (2G) and (2B) to be superimposed on the screen (3) to obtain a desired large color image screen.

[Problem that the invention seeks to solve]

However, in such a three-tube color projector (1), the red, green, and blue cathode ray tubes (IR, ), (IG), and (IB) of this color projector (1), and the screen (3). I had no freedom at all as my position was determined. For example, this color projector <11
Even when the camera is slightly shifted to the left or right, the focus and registration become incorrect, various image distortions occur, and the image screen becomes difficult to view.

In order to properly correct this distorted image screen, it is necessary to correct the image distortion in the horizontal and vertical directions, as shown in Figure 7, in addition to correcting the focus and registration. For example, more than 40 adjustment means must be adjusted, and this adjustment requires skill and a long time, and is inconvenient in that it is impossible for general users to perform the adjustment.

In view of this, the present invention has been developed to provide a video screen without image distortion even if the distance, angle, etc. between the projector, three cathode ray tubes (IR, IG), and (IB) and the screen (3) are changed. The purpose is to make it easily obtainable.

[Means for solving problems]

The deflection correction device for a multi-tube projector according to the present invention is applied to a multi-tube (IR) of a multi-tube projector as shown in FIG.

(IG) and (IB) are adjusted by motors (4R), (4G), and (4B), respectively, and this motor (4R,).

(4G), (4B), this multi-tube (1)1. ).

(IG) and (IB) are equipped with deflection correction device coils.

[Effect]

According to the invention, the multi-tube (IR) of the multi-tube projector.

(IG), (IB) lens system (2R), (2
Focus lens adjustment of G) and (2B) is performed by motors (4R), (4G), and (4B), respectively, and these motors (4R,), (4G), and (4B)
This multi-tube (IR), (IG
) and (IB), so even if you change the distance, angle, etc. between the projector (1) and the screen (3), and adjust the focus lens, the 1-plane distortion will be reduced. You can get a large color video screen without any need for color.

〔Example〕

An embodiment of the deflection correction device for a multi-tube projector according to the present invention will be described below with reference to the drawings.

In this example, the projector uses three tubes as shown in FIG. 1, a red ray tube (IR), a green ray tube (IG), and a blue cathode ray tube (IB) as shown in FIG. consists of
2nd class red, green and blue cathode ray tubes (IR,).

The red, green, and blue video screens obtained in (IG) and (IB) are transferred to lens systems (2R), (2G), and (2G), respectively.
2B) and are projected onto the screen (3) in an overlapping manner.

In this example, the lens systems (2R,), (2G) and (2B) are mounted on a manipulator that can be moved in three axes, front and back, left and right, and up and down, respectively, and this manipulator is connected to a motor (4R,), (4G) and (4B) are used for driving. In this case motor (4R), (4
G) and (4B) are the front and back control signals S for each.
1. The lens systems (2R5), (2G), and (2B) are moved back and forth, left and right, and up and down, respectively, in accordance with the left and right control signals S2 and the up and down control signals S3. In this case dust, this control signal S1. S2 and S3 each have a motor (4
In this example, the control voltage source (5R,l,
Let it occur from (5G) and (5B). In this example, the control voltage source (5R).

(5G) and (5B) respectively, the front/back, left/right, and up/down control signals S1. Manual adjustment means for manually adjusting S2 and S3 are provided respectively.

In addition, in this example, these control voltage generation sources (5R), (5G
) and (5B) front and rear, left and right, and up and down control signals s1. S2 and S3 are connected to a deflection distortion correction signal forming circuit (6
). In this case, the deflection distortion correction signal forming circuit (for 61K, horizontal sawtooth wave signal, vertical sawtooth wave signal, horizontal as shown in the column of correction waveforms in FIG. 7), Labora wave signal, vertical para? wave signal and DC voltage, respectively front and rear, left and right, and up and down control signals Sl.

A cathode ray tube (IR) that generates this deflection distortion correction signal according to S2 and S3 and corresponds to this deflection distortion correction signal, respectively.

It is supplied to the deflection yokes of (IG) and (IB).

In this Figure 1, (force is a horizontal sawtooth wave generator that generates a sawtooth wave with a horizontal period, (8) is a horizontal zigzag wave generator that generates 9 ladera waves with a horizontal period, and (9) is a horizontal sawtooth wave generator that generates a sawtooth wave with a horizontal period. A vertical sawtooth wave generator that generates a sawtooth wave with a vertical period;
00) is a vertical lagora wave generator that generates .xi. lagora waves with a vertical period.

Regarding this deflection distortion (image distortion) correction, in this example, the red, green and blue cathode ray tubes (IR),
Horizontal and vertical sub-deflection yokes are provided in addition to the horizontal and vertical main deflection yokes of buttons (IG) and (IB), respectively. Further, in this example, a correction signal for horizontal distortion is formed as shown in FIGS. 2 and 3.

The circuits shown in FIGS. 2 and 3 are provided for red, green, and blue cathode ray tubes (IR), DG), and (IB), respectively. In Figure 2, a vertical sawtooth wave generator (
The vertical sawtooth wave signal obtained at the output side of 9) is supplied to the adder circuit (121) via the variable gain amplifier circuit αD, and the vertical/elephant wave signal obtained at the output side of the vertical/wobbly wave generator αC is generated. is supplied to the adder circuit (1z), and a DC voltage of +31 from the variable battery (+31) is supplied to the adder circuit α, and the output signal of the adder circuit α2 is sent to the corresponding cathode ray tube (IR) via the variable gain amplifier circuit I. , (IG) , (
'IB) horizontal main deflection yoke. In this case, the horizontal barrel distortion is corrected by the vertical para-71-wave signal, and the gain of the variable gain amplifier circuit (113) is adjusted by the vertical control signal 8.
3 to correct the horizontal trapezoidal distortion, and the variable battery [13
The DC voltage value of 1 is controlled by the left and right control signals S2 to correct the horizontal center position, and the gain on the variable gain amplifier circuit side is controlled by the front and rear control signals S1 to control and adjust the amplitude. In addition, in Fig. 3, the horizontal sawtooth wave signal obtained at the output side of the horizontal sawtooth wave generator (7) is transferred to the variable gain amplifier circuit α.
The horizontal parasitic wave signal obtained at the output side of the horizontal/horizontal wave generator (8) is supplied to the adder circuit (161) via the adder circuit (161), and the The output signal is supplied to the multiplication circuit (171).The vertical sawtooth wave signal obtained at the output side of the vertical sawtooth wave generator (9) is supplied to the addition circuit (171) via the variable gain amplifier circuit αa.
19, and the vertical and oscillating wave signals obtained at the output side of the vertical/horizontal Bola wave generator 0■ are supplied to the adder circuit 9 via the variable gain amplifier circuit ■, and this adder circuit α9
The output signal of is supplied to the multiplication circuit σn, and this multiplication circuit (L
The output signal of 7) is supplied to the adder circuit (211), and the DC voltage obtained at the output side of the voltage variable battery for correcting the horizontal center position is supplied to this adder circuit (2D), and the output signal of this adder circuit is It is supplied to the horizontal sub-deflection yokes of the corresponding cathode ray tubes (IR), (IG), and (IB) via the variable gain amplifier circuit @.In this case, the gain of the variable gain amplifier circuit (151) is supplied to the left and right control signal S2. The gain of the variable gain amplifier circuit αa is controlled by the sum signal of the vertical control signal S3 and the left/right control signal S2 to correct the horizontal rotating ball, and the variable gain amplifier circuit (a) The gain of the variable gain amplifier circuit (c) is controlled by the left and right control signal S2 to correct horizontal bow distortion or horizontal barrel distortion, and the gain of the variable gain amplifier circuit (c) is controlled by the front and rear control signal S1 to control the amplitude.

Further, in this example, a correction signal for vertical distortion is formed as shown in FIGS. 4 and 5. This figure 4 and 5
The circuit shown is red, green and blue cathode ray tube (IR)
, (IG) and (IB). In Fig. 4, the vertical sawtooth wave signal obtained at the output side of the vertical sawtooth wave generator (9) is supplied to the adder circuit via the variable gain amplifier circuit (24), and the vertical sawtooth wave generator (9) is The vertical/cerabola wave signal obtained on the output side of a is supplied to the adder circuit, and the DC voltage of the variable battery 2 is supplied to this adder circuit (251 VC is supplied, this adder circuit C) 5
) to the corresponding cathode ray tubes (IR) and (IG) through a variable gain amplifier circuit (5).

(IB) is supplied to the vertical main deflection yoke. In this case, the gain of the variable gain amplifier circuit @ is controlled by the vertical control signal S3 to correct the vertical linearity, and the DC voltage of the variable battery 2 is controlled by the vertical control signal S3 to correct the vertical center position.
Further, the gain of the variable gain amplifier circuit is controlled by the front and rear control signals S1 to control and adjust the amplitude. In addition, in Figure 5, a horizontal sawtooth wave generator (a horizontal sawtooth wave signal obtained on the output side of the force is supplied to an adder circuit (to) via a variable gain amplifier circuit (to), and a horizontal paradera wave generator) (8
) is supplied to an adder circuit via a variable gain amplifier circuit (to), and the output signal of this adder circuit is supplied to a multiplier circuit C311. In addition, the vertical sawtooth wave signal obtained at the output side of the vertical sawtooth P IJ wave generator (9) is supplied to the processing circuit □□□ via the variable gain amplifier circuit (3δ). q
■ Vertical/Nara obtained on the output side? The wave signal is supplied to the adder circuit @ via the variable gain amplifier circuit (to), and the variable Ikeda DC voltage is supplied to this adder (to) K, and the output signal of this adder circuit is sent to the multiplication circuit c3υ. The output signal of this multiplier circuit C3υ is sent to a variable gain amplifier circuit (36
) respectively corresponding cathode ray tubes (IR), (IG
), (IB) are supplied to the vertical sub-deflection yoke. In this case, the gain of the variable gain amplifier circuit (281) is controlled by the sum of the vertical control signal S3 and the left/right control signal S2 to correct rotation and trapezoidal distortion, and the gain of the variable gain amplifier circuit (281) is controlled by the vertical control signal S3 and the left/right control signal S2. S3 and the left and right control signals S2 are controlled to correct bow and barrel distortions, and the gain of the variable gain amplifier circuit c32 is controlled by the left and right control signals S2 to correct trapezoidal distortion. The gain of the variable battery (to) is controlled by the vertical control signal S3 to correct bow and barrel distortion, and the DC voltage of the variable battery (to) is controlled by the sum of the left and right control signals S2 and the vertical control signal S3 to adjust the center position. is corrected, and the amplitude is controlled by controlling the gain of the variable gain amplifier circuit (to) using the front and rear control signals S1.The circuit is configured in the same way as a conventional projector.

Since this example is configured as described above, the projector (1
) and screen (3), the lens system (2R) of the projector (1), (2
G).

(2B) to the respective motors (4R), (4G),
(4B), the front and rear control signal S1, the left and right control signal S2, and the vertical division X1ff signal S3 are respectively supplied to adjust the focus of the focus lens. In this case, this focus AI may be performed using an autofocus method used by a camera or the like, or may be performed using the human eye. In this case, the deflection distortion correction signal forming circuit (6) shown in FIGS.
3, respectively, and control signals S1 . S2 and S3
Multi-tube (IFt), (IG), (IB) depending on
Since the amount of deflection correction is changed, a large color video screen with matching registration and no image distortion can be obtained by simply adjusting the focus lens.

Also from this time, the projector (11) and screen (3
), the 7 orcus lens can be adjusted in the same manner by changing the distance, angle, etc. with the front and rear control signal S1, and the left and right control signal S2.
and the motor (4R) by adjusting the vertical control signal S3,
By performing (4Gl, (4B)), multitubular (
The deflection correction amounts of IR), (IG), and (IB) are changed, and a large color video screen with less image distortion than K can be obtained.

Therefore, according to this example, the projector (1) and the screen (
3), so it is easy to install this projector (1).
) and the screen (3) can be easily installed at any location even by general users.

It goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations can be taken without departing from the gist of the present invention.

〔Effect of the invention〕

According to the invention, a projector (1) and a screen (3)
When installing a projector (1) and a screen (3), you can obtain a well-registered and distortion-free projected image by simply adjusting the focus lens after placing the projector (1) and screen (3) in the specified positions. Projector (1)
There is an advantage that even general users can easily install the screen (3) and the screen (3) at any location.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a deflection correction device for a multi-tube projector according to the present invention, FIGS. 2 and 3 are system diagrams showing an example of a horizontal deflection distortion correction signal forming circuit, and FIGS. Fifth
The diagrams are a system diagram showing an example of a vertical deflection distortion correction signal forming circuit, FIG. 6 is a configuration diagram showing an example of a color projector, and FIG.
The figure is a diagram for explaining the present invention. (1) is a projector, (IR), (IG) and (
IB) are red, green and blue cathode ray tubes, respectively (2R)
, (2G) and (2B) are lens systems, (3) is a screen, (4f(,), (4G) and (4B) are motors, (51(),
(5G) and (5B) are respective control signal generation sources, and (6) is a deflection distortion correction signal forming circuit. Same as Hidemori Matsukuma, Eng'・I?
1・1-station 1-. '〆 Fig. 1 shows an example of a half-inert #l positive signal type wide circuit Fig. 2 water-doushi term %? Distortion o shoulder correction 1111 type/i”i times (
11 No. 3 of the circuit to the figure of Naobutsu-kuzune-Masyogo form 1 Fig. 4

Claims (1)

[Claims] A multi-tube projector characterized in that the focus lens adjustment of each tube of the multi-tube projector is performed by a motor, and the deflection distortion correction amount of each of the tubes is changed in accordance with a control signal to the motor. Projector deflection correction device.