JPH05323451A - Video projector device - Google Patents

Abstract

PURPOSE:To provide a video projector device capable of automatically adjusting the position of a zoom lens, enlarging and contracting a picture size to a desired one, automatically measuring the picture size projected on a screen without directly measuring it, and performing on-screen display only by inputting the desired picture size. CONSTITUTION:The picture size is inputted by an inputting part 1, the zoom position of the zoom lens 3a is calculated based on the inputted value and a distance from the device to the screen measured by a distance measuring part 4, a lens driving part 7 moves the zoom lens 3a to a specified position, and the desired picture size is obtained. And the size of a picture projected on the screen is calculated by a calculating processing part 6 based on the distance measured by the distance measuring part 4 and the zoom position of the zoom lens 3a obtained by a lens position detecting part 5, and the on- screen display is executed through an on-screen display part 8 on the video projected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video projector device, and more particularly to a video projector device having a zoom lens capable of automatically controlling a zoom position.

[0002]

2. Description of the Related Art As an image reproducing method which can easily enlarge a screen as compared with a direct view type monitor, there is a projection type video projector device for projecting on a screen or the like. There is such a projection type video projector device as shown in FIG. 11. FIG. 11 (a) is a projector device using a cathode ray tube as a display device, and FIG. 11 (b) is one color liquid crystal plate. FIG. 11C shows a single plate type liquid crystal projector device utilizing the above, and a three plate type liquid crystal projector device in which light of three primary colors is passed through three black and white liquid crystal plates and optically combined.

FIG. 12 is a schematic view for explaining the zoom operation of the video projector device as shown in FIG. Note that a part (circuit) for generating an image is omitted. When the zoom lens 10 is moved to the right in the figure, the projection angle increases and the screen size of the image projected on the screen 11 increases. On the contrary, when the zoom lens 10 is moved leftward, the projection angle becomes smaller and the screen size on the screen 11 becomes smaller. As described above, the screen size of the image on the screen projected from the video projector device is changed by moving the zoom lens 10 to the zoom position manually or by the power of a motor or the like.

[0004]

However, in the conventional video projector device, in order to know the screen size of the image projected on the screen, the size on the screen has to be actually measured. Also, in order to set the desired screen size, it was necessary to directly measure the size on the screen while moving the zoom lens and adjust to the screen size.

[0005]

In order to solve the above-mentioned problems of the prior art, the present invention is a video projector device for projecting an image on a screen, in which distance measurement is performed for measuring the distance between the screen and the video projector device. Section, a zoom lens for projecting an image on the screen and changing the projection angle, a lens position detecting section for recognizing the position of the zoom lens, and a lens driving section for moving the zoom lens to a predetermined zoom position, An input unit for inputting a screen size, an operation command, etc., and the zoom for projecting to the input screen size from the screen size input from the input unit and the value of the distance measured by the distance measuring unit. The zoom lens obtained by the lens position detection unit by calculating the zoom position of the lens and controlling the lens driving unit. A calculation processing unit that calculates a screen size projected on the screen from a zoom position and the value of the distance measured by the distance measurement unit, and a screen size on the screen calculated by the calculation processing unit And an on-screen display section for displaying on-screen.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A video projector device of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a video projector device of the present invention. In FIG. 1, the input unit 1 is provided in the main body of the apparatus, or is composed of a remote controller or the like, and a screen size display command and a desired screen size can be keyed in. The display unit 2 is an LCD (liquid crystal plate) or CRT (cathode ray tube).
And displays a video signal supplied from a video signal circuit (not shown). The projection lens 3 projects the image obtained on the display unit 2 on a screen or the like, moves the zoom lens 3a in the arrow direction to change the projection angle, and the screen of the image projected on the screen in relation to the projection distance. The size is decided. Since the screen size of a video image on a television receiver or the like has been generally displayed in the unit of inch, the screen size is hereinafter referred to as inch size in the present embodiment. 4 is a distance measuring unit including an infrared sensor,
Mounted on the front of the device, the distance from the device to the screen can be measured. The lens position detection unit 5 recognizes the position of the zoom lens 3a and supplies the obtained data to the calculation processing unit 6.

The calculation processing unit 6 includes an input unit 1 and a distance measuring unit 4
Also, the data obtained by the lens position detection unit 5 is calculated, and the data is supplied to the lens drive unit 7 when controlling the position of the zoom lens 3a and to the on-screen display unit 8 when displaying the inch size on the screen. .. The calculation processing unit 6 stores the relationship between the inch size, the projection angle, and the measurement distance as shown in FIG. FIG. 2 is a three-dimensional representation that is easy to understand by combining FIG. 3 showing the relationship between inch size and projection angle by the difference in distance and FIG. 4 showing the relationship between distance and inch size by the difference in projection angle. Is. This relationship shows general performance of the zoom lens 3a, and is represented by a curved surface S, and there is only the surface of S where the relationship of measurement distance, projection angle, and inch size can be satisfied. Further, FIG. 5 is a diagram showing the relationship between the zoom position of the zoom lens 3a and the projection angle. From the relationship of FIGS. 2 and 5, projection is performed on the inch size projected on the screen or the desired inch size. The zoom position of the zoom lens 3a is calculated.
The lens drive unit 7 moves the zoom lens 3a in the arrow direction by a motor or the like (not shown) based on the data obtained by the calculation processing unit 6.

FIG. 6 is a flow chart for explaining the operation of the video projector device of the present invention, which is used when a desired inch size is displayed on the screen. In FIG. 1, an inch size value to be displayed is input from the input unit 1 and supplied to the calculation processing unit 6 (step 1). As described above, the calculation processing unit 6 stores the relationship between the inch size, the projection angle, and the measurement distance as shown in FIG. 2, and the input inch size can be realized (see FIG. 2A). In (a) to (b), it is determined (step 2). If the input inch size cannot be realized, a display to that effect is displayed on the on-screen display unit 8 from the calculation processing unit 6 (step 3), and if it can be realized, the process proceeds to the next step.

Next, from the calculation processing unit 6 to the distance measuring unit 4,
An instruction is issued to measure the distance from the device to the screen (step 4), and the calculation processing unit determines whether the measured distance is a projectable distance (in the range of c to d in FIG. 2A). The judgment is made at 4 (step 5). If the distance is such that projection is impossible, a display to that effect is displayed on the on-screen display unit 8 from the calculation processing unit 6 (step 6), and if it is possible, the process proceeds to the next step. Next, the calculation processing unit 4 determines whether or not the distance to the screen can satisfy the specified inch size (step 7).
Here, in FIG. 2A, if the desired inch size is e, the feasible portion is on the line f where the curved surface S and the plane of the inch size e intersect. For example, when the distance obtained by the distance measuring unit 4 is g, g → h → i
If it does not intersect the line of f as in the above, it cannot be realized due to the performance of the lens. Therefore, a point k that can be realized from the j point on the line of f is found, and the distance difference between g and k is displayed. A command is issued to the screen display unit 8 (step 8).

When the distance to the screen is satisfied with respect to the specified inch size, the calculation processing unit 6 calculates the projection angle based on the specified inch size and the distance to the screen (step 9). In FIG. 2A, when the distance measured by the distance measuring unit 4 is l,
→ m → n intersects on the line of f, and o → p → q and projection angle q are obtained. Next, the calculated projection angle (see FIG.
In (a), from q), from the relationship between the zoom position of the zoom lens 3a and the projection angle shown in FIG. 5 stored in the calculation processing unit 6, the zoom position of the zoom lens 3a (see FIG.
In, r) is calculated (step 10). The calculated zoom position is transmitted to the lens driving unit 7, the zoom lens 3a is moved to a predetermined position (step 11), and the projection angle is changed, so that the image projected on the screen is displayed as shown in FIG. Make it the desired inch size. Further, the designated inch size is transmitted to the on-screen display unit 8, and the number of inches is displayed on the screen through the display unit 2 as shown in FIG. 8 (step 12).

FIG. 9 is a flow chart for explaining the operation of the video projector device, which is used when displaying the inch size of the projected image on the screen. An input for displaying the projected inch size is input from the input unit 1 and supplied to the calculation processing unit 6 (step 13). A command is issued from the calculation processing unit 6 to the distance measuring unit 4 to measure the distance from the device to the screen (step 14). Next, the calculation processing unit 6 determines whether or not the measured distance is a projectable distance (within the range of a to b in FIG. 2B) (step 15), and the projection impossible distance is determined. In this case, an instruction is issued to the on-screen display unit 8 to display that effect (step 1
6) If possible, go to the next step.

Next, the position of the zoom lens 3a recognized by the lens position detector 5 (for example, s in FIG. 5).
The projection angle (t in FIG. 5) is calculated by the calculation processing unit 6 (step 17), and the inch size is calculated from the calculated projection angle and the measured distance (step 1).
8). In FIG. 2B, if the distance measured by the distance measuring unit 4 is u, it follows as u → v. Further, from the projection angle t calculated previously, it follows that t → w → x, and y
Hit at points. The inch size z at the y point is required. Further, the calculated inch size is transmitted to the on-screen display unit 8 and displayed on the screen through the display unit 2 as shown in FIG.

It is also possible to simply display the distance from the device to the screen on screen. Figure 10
Is a flowchart for explaining the operation of displaying the distance to the screen on-screen, and an input for measuring the distance to the screen is input from the input unit 1 and supplied to the calculation processing unit 6 (step 20). Next, the calculation processing unit 6 issues a command to the distance measuring unit 4 to measure the distance to the screen (step 21), and the calculation processing unit 6 transmits the measured distance to the on-screen display unit 8. On-screen display is performed through the display unit 2.

[0014]

As described in detail above, the video projector apparatus of the present invention inputs the screen size without adjusting the zoom position of the zoom lens while measuring the desired screen size on the screen. Alone
You can automatically adjust the zoom position of the zoom lens to enlarge or reduce to the desired screen size. Further, it is possible to automatically measure the screen size projected on the screen without directly measuring it, and it is possible to display the value on-screen, which is a very excellent effect in practical use.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a video projector device of the present invention.

FIG. 2 is a diagram showing a relationship between an inch size, a projection angle, and a measurement distance.

FIG. 3 is a diagram showing a relationship between an inch size and a projection angle by a difference in distance.

FIG. 4 is a diagram showing the relationship between distance and inch size by the difference in projection angle.

FIG. 5 is a diagram showing a relationship between a zoom position of a zoom lens and a projection angle.

FIG. 6 is a flowchart for explaining the operation of the video projector device of the present invention.

FIG. 7 is a schematic perspective view showing an inch size changing operation of the video projector device.

FIG. 8 is a schematic perspective view of an on-screen display of an inch size of the video projector device.

FIG. 9 is a flowchart for explaining the operation of the video projector device of the present invention.

FIG. 10 is a flowchart for explaining the operation of displaying the distance to the screen on screen.

FIG. 11 is a diagram showing a general application example of a video projector device.

FIG. 12 is a schematic diagram for explaining a zoom operation of the video projector device.

[Explanation of symbols]

 1 Input Section 2 Display Section 3 Projection Lens 3a Zoom Lens 4 Distance Measuring Section 5 Lens Position Detection Section 6 Calculation Processing Section 7 Lens Driving Section 8 On-Screen Display Section

Claims (1)

[Claims] 1. A video projector device for projecting an image on a screen, a distance measuring unit for measuring a distance between the screen and the video projector device, a zoom lens for projecting an image on the screen and changing a projection angle, A lens position detection unit that recognizes the position of the zoom lens, a lens drive unit that moves the zoom lens to a predetermined zoom position, an input unit that inputs a screen size, an operation command, etc., and an input unit that is input from the input unit. From the size and the value of the distance measured by the distance measuring unit, the zoom position of the zoom lens is calculated so as to project on the input screen size, the lens driving unit is controlled, and the lens position detection is performed. From the zoom position of the zoom lens obtained from the section and the value of the distance measured by the distance measuring section. A video projector comprising: a calculation processing unit that calculates a screen size projected on a clean screen; and an on-screen display unit that displays the screen size on the screen calculated by the calculation processing unit on-screen. apparatus.