JP2003099197A - Touch panel type projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a touch panel type projector capable of preventing the occurrence of tailing. SOLUTION: When a screen 3 is touched by an exclusive touch/detach detection pen 4, a pulse signal constituted of an infrared ray is emitted. The infrared signal emitted from the touch/detach detection pen 4 is transmitted through the screen 3 as shown in a figure 2, and received through reflecting mirrors 5 and 6 by a receiving unit 7. For a touch panel type projector which is not provided with the first reflecting mirror 6 as shown in a figure 3, the infrared signal is received only through the second reflecting mirror 5 by the receiving unit 7. Lately, an aspherical mirror 8 may be used for the second mirror in order to reduce the depth of a projector 1 as shown in a figure 4, and the infrared signal is received through the aspherical mirror 8 by the receiving unit 7 in the same way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear projection type projector with a touch panel.

[0002]

2. Description of the Related Art In recent years, a product in which a touch panel is attached to a large projector has been put on the market. There are various types of this touch panel, but more and more ones scan the surface of the screen with infrared rays or laser light and optically detect the interruption of the light to determine the coordinates. This is because it is more cost effective than the other ultrasonic elastic wave type and contact resistance type.

[0003]

By the way, in the case of using light, the light scans a few millimeters on the screen. Therefore, when a finger or the like is brought close to the screen, it touches the light before touching the screen. , There was a problem that the touch was detected even though I was not touching the screen. This problem is a so-called "tailing" phenomenon in which, for example, when drawing characters or a picture on the screen with blackboard software or the like, parts that should have been separated are connected. If this is remarkable, it becomes difficult to use. FIG. 11 is a diagram showing an example of tailing. The left side is an example in which there is no tailing, and the right side is an example in which tailing has occurred. In addition, FIG.
Is an example in which light is scanned using a polygon (Japanese Patent Laid-Open No. 2-212058).
000-148397). The polygon 15 forms a light film on the screen 3. The principle is the same as that of FIG. 6, but the coordinate position can be known by synchronizing with the scan timing, so the member 12 to which the retroreflective tape is attached
Is not necessary.

FIG. 10 shows an example using an infrared LED array (see Japanese Patent Laid-Open No. 2000-200150). Reference numeral 16 a or b is an infrared array, and light is generated orthogonally to each other, and is received by a photo detector array 17 a or b. This method has an advantage that the touch position can be directly recognized because the lights are orthogonal to each other, but the cost is high. In either case, the light will fly a few millimeters away from the touch screen, causing tailing. Therefore, an object of the present invention is to provide a touch panel type projector in which this problem is improved and tailing does not occur.

[0005]

According to a first aspect of the invention, in a rear projection type projector with a touch panel, infrared rays sent from a dedicated pen for sending touch and detach signals to the screen by infrared rays are screened. The above-mentioned object is achieved by providing a reflection mirror that transmits the light and then reflects it, and an infrared receiver arranged near the projector in the main body that receives the infrared light reflected by the reflection mirror.

According to a second aspect of the present invention, in the first aspect of the present invention, the reflection mirror includes a first reflection mirror for reflecting the infrared ray transmitted through the screen and an infrared ray reflected by the first reflection mirror. It further comprises a second mirror that reflects the light and sends it to the infrared receiver. According to the invention of claim 3, in the invention of claim 1,
A circular mirror is used as the reflection mirror.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a basic configuration of an embodiment of the present invention. A projection type projector 2 is arranged inside a box type rear projection type projector 1. This projector 2
The light projected from is projected onto the screen 3 via the first reflecting mirror 6 and the second reflecting mirror 5. When the dedicated touch / detach detection pen 4 touches the screen 3, it emits a pulse signal by infrared rays.

FIG. 5 is a diagram showing the structure of the touch / detachment detecting pen 4, and when the tip portion 9 moves and the screen is touched, the tact switch 18 is pressed to turn on the infrared LED from the LED 10. A contact switch using a conductive member may be used instead of the tact switch. touch·
The infrared light signal emitted from the detachment detection pen 4 is shown in FIG.
As described above, the light passes through the screen 3 and is received by the receiving unit 7 via the reflection mirrors 5 and 6. FIG. 3 shows a type in which the first reflecting mirror 6 is not provided, and in this case, the signal is received by the receiving unit 7 via only the second reflecting mirror 5. Further, as shown in FIG. 4, recently, in order to reduce the depth of the projector 1, an aspherical mirror 8 may be mainly used as the second mirror, but similarly, the receiving unit 7 is also provided via the aspherical mirror 8. Is being received at.

By the way, as mentioned above, the number of touch panels using light is increasing, and the principle thereof will be described. FIG. 6 is described in Japanese Patent Laid-Open No. 2000-105671. Laser light transmitting / receiving units 13L and 13R are arranged on the left and right sides below the screen 3. The members 12 to which the retroreflective tape is attached are arranged on the left and right sides and on the upper side. As shown in FIG. 7, the laser light emitted from, for example, 13 L spreads in a fan shape and is arranged so as to cover the screen 3. When the point a is touched with a finger or the like, the light emitted from 13L becomes a shadow at that portion, and flies to the member 12 to which the retroreflective tape is attached. Member 1 with retroreflective tape attached
With respect to the light reflected in the incident direction by 2, the return angle of 13 L is detected again.

Similarly, at 13R, the angle of part a is detected,
The coordinate of a is calculated from the previously known distance between 13L and 13R. In this system, the light 14 emitted from the laser light transmitting / receiving unit 13 travels along the surface of the screen 3 as shown in FIG. The closer the light 14 is to the surface of the screen 3, the better, but if the light 14 strikes the screen 3 and is reflected, the received waveform is disturbed and a problem occurs. Therefore, the screen 3 and the light 14 are empirically good at a distance of about 4 to 6 mm. Then, the touch / detach detection pen 4 touches the screen 3
When the light beam 14 comes close to, the light 14 is touched before touching the screen 3, so that the tailing described above occurs.

In the present embodiment, this tailing is prevented. That is, by using the dedicated touch / detachment detection pen 4 and receiving the separate signal for touch / detach in addition to the above-mentioned study for obtaining the coordinates, it is possible to accurately determine the touch time and the detach time. You can eliminate the pull.

[0012]

According to the first and second aspects of the present invention, it is possible to eliminate the tailing phenomenon which is a malfunction of the touch panel using light, and the receiving unit can be provided inside the main body to save space. Becomes Further, by reflecting the infrared signal through the mirror and bringing it to the internal projector section, it is possible to increase the degree of freedom in arranging the receiving section. According to the invention described in claim 3, the depth of the projector can be reduced by using the aspherical mirror.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of the present embodiment.

FIG. 2 is a diagram showing an infrared ray passage in the present embodiment.

FIG. 3 is a view showing a path of infrared rays when a single reflecting mirror is used.

FIG. 4 is a diagram showing a path of infrared rays when an aspherical mirror is used.

FIG. 5 is a diagram showing a configuration of a dedicated touch / detach detection pen.

FIG. 6 is a diagram showing an example of a projector in which laser light transmitting / receiving units are arranged on the lower left and right sides of a screen.

FIG. 7 is a diagram illustrating detection of light.

FIG. 8 is a diagram illustrating light passage positions.

FIG. 9 is a diagram showing an example of scanning light using a polygon.

FIG. 10 is a diagram showing an example using an infrared LED array.

FIG. 11 is a diagram showing an example of tailing.

[Explanation of symbols]

1 Box type rear projection type projector 2 Projection type projector 3 Screen 4 Touch / detach detection pen 5 Second mirror 6 First mirror 7 Reception unit 4 Dedicated touch / detach detection pen 9 Tip 10 LED 18 tact switch

Claims (3)

[Claims] 1. In a rear projection type projector with a touch panel, a reflection mirror for transmitting infrared rays transmitted from a dedicated pen for transmitting touch and detach signals to the screen by infrared rays through the screen and thereafter reflecting the infrared rays. A touch panel type projector, comprising: an infrared receiver arranged in the vicinity of the projector inside the main body for receiving infrared rays reflected by a reflection mirror. 2. The first reflection mirror, wherein the reflection mirror reflects infrared rays transmitted through the screen, and the second mirror which further reflects the infrared rays reflected by the first reflection mirror and sends the infrared rays to an infrared receiver. The touch panel type projector according to claim 1, comprising: 3. The touch panel type projector according to claim 1, wherein an aspherical mirror is used as the reflection mirror.