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Light flux control required when person enters path of projected light emitted from projector

A light beam control and projection light technology, applied in optics, instruments, color TV parts, etc., can solve problems such as user discomfort

Inactive Publication Date: 2008-07-30
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The designed beam of the projected light from the projector tends to gradually increase, whereby the user is more likely to have a more unpleasant feeling

Method used

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  • Light flux control required when person enters path of projected light emitted from projector
  • Light flux control required when person enters path of projected light emitted from projector
  • Light flux control required when person enters path of projected light emitted from projector

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0063] figure 2 It is a schematic perspective view showing the appearance of the projector PJ1 as the first embodiment of the present invention. The photodiode PD is arranged near the projection lens PL of the projector PJ1 facing the direction of the exit surface of the projection lens, and the light emitting diode NL and reset button RB are arranged on the upper surface of the projector PJ1 frame.

[0064] image 3 It is an explanatory diagram showing a schematic configuration of the projector PJ1. The projector PJ1 includes: an image signal processing unit 100 for processing red (R), green (G), and blue (B) color signals (hereinafter, the three color signals are collectively referred to as "RGB signals"); and Three liquid crystal panels 110R, 110G, and 110B corresponding to each color signal; a contrast control circuit 120 ; and a detection unit 130 .

[0065] The image signal processing unit 100 includes: three amplifier circuits 210R, 210G, and 210B; and an image proc...

no. 2 Embodiment

[0085] Figure 5 It is an explanatory diagram showing a schematic configuration of a projector PJ2 as a second embodiment. Note that this projector PJ2 has the same appearance as the projector PJ1 of the first embodiment, so its illustration is omitted. The main difference between this projector PJ2 and the projector PJ1 in the first embodiment is that the detecting unit 130 ( image 3 ) of the luminance measurement unit 310, the luminance comparison unit 320 and the reference luminance level generation unit 330 are replaced by the luminance measurement unit 310A, the luminance comparison unit 320A and the reference luminance level generation unit 330A; the detection unit 130 is replaced by the detection unit 130A; , in the image signal processing unit 100 ( image 3 ) between the outputs of the three amplifier circuits 210R, 210G, and 210B and the input of the image processing circuit 220, a reference luminance signal generation unit 140 is newly provided.

[0086] In the ...

no. 5 Embodiment

[0116] Figure 10 It is an explanatory diagram showing a schematic configuration of a projector PJ 5 as a fifth embodiment. Note that this projector PJ5 has the same appearance as the projector PJ4 of the fourth embodiment, so its illustration is omitted. This projector PJ5 differs from the projector PJ4 in the fourth embodiment in that the detection unit 130C is replaced with a detection unit 130D.

[0117] The detection unit 130D includes an ultrasonic transmitter 510 , an ultrasonic receiver 520 , a comparator 322 , an ultrasonic reference level generator 530 , a time measurement unit 540 , a register 550 , a digital comparator 560 , and a notification unit 340 . The ultrasonic transmitter 510 generates an ultrasonic signal in the ultrasonic oscillation circuit 512 in synchronization with the start signal ST output from the time measurement control circuit 542 of the time measurement unit 540 . The generated ultrasonic signal is amplified by the amplifying circuit 514 and...

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Abstract

A projector of the present invention includes: an electro-optic device that outputs rays modulated according to a given image signal, an image processing unit that transmits the image signal to the electro-optic device, and a luminous flux control device that controls an output luminous flux of projection rays, which are output from the electro-optic device and projected. The luminous flux control device has: a detector unit that detects a person who approaches a path of the projection rays; and a controller unit that controls the output luminous flux of the projection rays when the detector detects the approach of the person. This arrangement controls the output luminous flux of the projection rays when a person approaches the path of the projection rays and the projection rays directly enter the field of view of the person, thus effectively relieving the unpleasantness due to the incidence of the projection rays.

Description

[0001] This application is a divisional application of: [0002] Title of invention: "Beam control when a person enters the path of projected light emitted from a projector" [0003] The application date is: April 24, 2001 [0004] The application number is: 01801081.4 (PCT / JP01 / 03541) technical field [0005] The present invention relates to light quantity control when a person enters the path of projected light emitted from a projector. Background technique [0006] A projector that is often used for display is an image display device, and displays an image by projecting light (projection light) for displaying an image based on an image signal supplied from an image supply device such as a computer. The image projected on the screen can be displayed while being instructed by the user. [0007] In the case of projecting an image onto the screen from a projector placed in front of the screen (such projection is called "front projection"), the space through which the proje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/00H04N5/74G09F9/00H04N5/58
CPCG03B21/00H04N5/74H04N5/58G03B21/006
Inventor 米野邦夫
Owner SEIKO EPSON CORP