JPH0728166A - Video projector device - Google Patents

Abstract

PURPOSE:To make adjustment of the projecting distance and also alignment of optical axis simply and quickly by displaying the projecting distance and the angle of optical axis by the use of light emitting elements, light receiving element. etc., and conducting the adjustment of a video projector while the user is watching the displayed contents. CONSTITUTION:To make adjustment of the projecting distance, light emitting elements installed on the sides of a video projector 1 are allowed to make light emission. The emitted light is reflected by a screen 3 and received by a light receiving element 5. The reflection time at this time is measured by a measuring device 6, and the result is supplied to a projecting distance measuring device 7 so that the projecting distance is determined. The obtained distance is displayed on a display part 8, and the optimum distance between the video projector 1 and screen 3 is set while the user is watching the displayed contents. Alignment of the optical axis takes place in the same manner, i.e., the light emitting elements 4 on the two sides are actuated for light emission. The inclination of the video projector to the screen 3 is sensed by a reflected light intensity measuring device 9, and from the given signal, the angle of inclination is determined by an optical axis angle measuring device 10 and displayed on an optical axis angle display part 11, and thereupon the alignment is conducted.

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 which can be easily installed and adjusted.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a general video projector device. In the figure, 1 is a video projector, 2 is its lens, and 3 is a screen. Conventionally, in such a video projector device, in order to perform an optimum layout, an actual image is projected from the video projector 1 onto the screen 3, and the video projector 1 is moved in the left and right and up and down directions while watching the image. , The optical axis was adjusted.

[0003]

In the conventional projection distance adjustment and optical axis adjustment of the video projector device, the video projector is moved from the distortion by seeing the image projected on the screen. There was a problem that it took a lot of time to make adjustments by repeating trial and error because it was not known whether to move the video projector.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a video projector device capable of easily adjusting the projection distance and the optical axis in a short time.

[0005]

A video projector according to the present invention includes a light emitting element which emits light toward a screen which displays an image from the video projector, a light receiving element which detects reflected light from the screen, a light emitting element and a light receiving element. The projection distance measuring means for receiving the signal from the element to obtain the projection distance of the video projector and the display means for displaying the projection distance are provided. Further, it is provided with an optical axis angle measuring means for measuring the intensity of the light emitted from the light emitting element and the intensity of the reflected light received by the light receiving element and for obtaining the optical axis angle therefrom, and an optical axis angle display means. Further, an oscillator that emits a sound wave toward the screen, a sound wave detection element that detects a reflected sound wave from the screen, a projection distance measuring unit that receives a signal from the oscillator and the sound wave detection element, and a projection distance measurement unit that projects the projection distance. And a display unit for displaying the distance.

[0006]

The video projector according to the present invention can adjust the position and orientation of the video projector while viewing the display of the projection distance and the optical axis angle.

[0007]

【Example】

Example 1. FIG. 1 is a plan view of a video projector device showing an embodiment of the present invention. In the figure, 1 is a video projector, 2 is a lens, 3 is a screen, 4 is a light emitting element provided on both sides of the video projector, 5 is a light receiving element also provided on both sides of the video projector, and 6 is the above light emitting element. 4 is a reflected light time measuring device connected to 4 and the light receiving element 5, 7 is a projection distance measuring device, and 8 is a projection distance display unit. Reference numeral 9 is a reflected light intensity measuring device connected to the light emitting element 4 and the light receiving element 5, 10 is an optical axis angle measuring device, and 11 is an optical axis angle display section.

Next, the operation will be described. In order to adjust the projection distance, the light emitting elements 4 provided on both sides of the video projector 1 are made to emit light. The emitted light is reflected by the screen 3 and is received by the light receiving element 5. The reflection time at that time is measured by the reflected light time measuring device 6, and this is supplied to the projection distance measuring device 7 to obtain the projection distance. Now, assuming that the reflection time is t, if the velocity v of the light from the light emitting element 5 is known, the projection distance 1 can be obtained by l = vt / 2. The projection distance thus obtained is displayed on the projection distance display unit 8, and the horizontal and vertical directions of the video projector 1 are adjusted while observing this display to set the optimum distance between the video projector 1 and the screen 3. . This operation is shown as a block in FIG.

To adjust the optical axis, the light emitting elements 4 provided on both sides of the video projector 1 are caused to emit light.
The emitted light is reflected by the screen 3 and detected by the light receiving element 5, but if the screen 3 is tilted with respect to the video projector 1, the intensity of the light received by the light receiving element changes depending on the tilt. This is detected by the reflected light intensity measuring device 9, the tilt angle of the screen 3, that is, the optical axis angle is taken out by the optical axis angle measuring device 10 from this detection signal, and the angle is displayed on the optical axis angle display section 11. Therefore, while watching this display, the video projector 1 is moved left and right and up and down for adjustment. This operation is shown as a block in FIG.

Since the adjustment of the projection distance and the adjustment of the optical axis as described above often deviate from the adjustment of the other, the projection distance display section 8 and the optical axis angle display section 11 are repeatedly adjusted. Then, the optimum layout of the video projector is determined, but the adjustment is easier than the conventional trial and error while viewing the image.

In the above embodiment, light is used for both the projection distance measurement and the optical axis angle measurement.
For the measurement of the projection distance, a sound wave from the oscillator provided in the video projector and a device for detecting the sound wave may be used.

[0012]

As described above, according to the present invention, the projection distance and the optical axis angle are displayed by using a light emitting element, a light receiving element, etc. instead of displaying images as in the conventional case, and a video is displayed while watching this display. Since the projector can be adjusted, there is an effect that the installation and adjustment of the video projector can be easily performed.

[Brief description of drawings]

FIG. 1 is a plan view of a video projector device showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing an operation of adjusting a projection distance of the video projector device of FIG.

FIG. 3 is a block diagram showing an operation of adjusting an optical axis angle of the video projector device of FIG.

FIG. 4 is a plan view showing a conventional video projector device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video projector 2 Lens 3 Screen 4 Light emitting element 5 Light receiving element 6 Reflected light time measuring device 7 Projection distance measuring device 8 Projection distance display unit 9 Reflected light intensity measuring device 10 Optical axis angle measuring device 11 Optical axis angle displaying unit

Claims (4)

[Claims] 1. A video projector, a screen for displaying an image from the video projector, a light emitting element which is provided in the video projector and emits light toward the screen, and a light receiving element for detecting reflected light from the screen. A projection distance measuring means for obtaining a projection distance of the video projector by receiving signals from the light emitting element and the light receiving element, and a display means for displaying the projection distance obtained by the projection distance measuring means. Video projector equipment. 2. A video projector, a screen for displaying an image from the video projector, a light emitting element which is provided in the video projector and emits light toward the screen, and a light receiving element for detecting reflected light from the screen. An optical axis angle measuring means for obtaining an optical axis angle of the video projector by receiving signals from the light emitting element and the light receiving element, and a display means for displaying the optical axis angle obtained by the optical axis angle measuring means. A video projector device characterized by the above. 3. A video projector, a screen for displaying an image from the video projector, a light emitting element which is provided in the video projector and emits light toward the screen, and a light receiving element which detects reflected light from the screen. Projection distance measuring means for obtaining a projection distance of the video projector by receiving signals from the light emitting element and the light receiving element, display means for displaying the projection distance obtained by the projection distance measuring means, the light emitting element and the light receiving element An optical axis angle measuring means for obtaining an optical axis angle of the video projector by receiving a signal from the element, and a display means for displaying the optical axis angle obtained by the optical axis angle measuring means are provided. Video projector equipment. 4. A video projector, a screen for displaying an image from the video projector, an oscillator provided in the video projector for emitting a sound wave toward the screen, and a sound wave detection for detecting a sound wave reflected from the screen. An element, a projection distance measuring means for obtaining a projection distance of the video projector by receiving signals from the oscillator and the sound wave detecting element, and a display means for displaying the projection distance obtained by the projection distance measuring means. A video projector device characterized by the above.