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
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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 emission surface of the projection lens, and the light emitting diode NL and the reset button RB are arranged on the upper surface of the housing of the projector PJ1.
[0064] image 3 This is an explanatory diagram showing the schematic configuration of the projector PJ1. The projector PJ1 includes: an image signal processing unit 100 that processes red (R), green (G), and blue (B) color signals (hereinafter, the three color signals are collectively referred to as "RGB signals"); and The three liquid crystal panels 110R, 110G, and 110B corresponding to each color signal; the contrast control circuit 120; and the detection unit 130.
[0065] The image signal processing unit 100 has three amplification circuits 210R, 210G, and 210...
no. 2 Embodiment
[0085] Figure 5 It is an explanatory diagram showing the schematic configuration of the projector PJ2 as the second embodiment. In addition, this projector PJ2 has the same external appearance as the projector PJ1 of 1st Example, and its illustration is abbreviate|omitted. The main difference between the projector PJ2 and the projector PJ1 in the first embodiment is that the detection unit 130 ( image 3 ) The brightness measurement unit 310, the brightness comparison unit 320, and the reference brightness level generation unit 330 are replaced with a brightness measurement unit 310A, a brightness comparison unit 320A, and a reference brightness level generation unit 330A; the measurement unit 130 is replaced with a detection unit 130A; at the same time, In the image signal processing section 100 ( image 3 Between the output of the three amplifier circuits 210R, 210G, and 210B of) and the input of the image processing circuit 220, a reference luminance signal generating unit 14...
no. 5 Embodiment
[0116] Picture 10 It is an explanatory diagram showing a schematic configuration of a projector PJ5 as the fifth embodiment. In addition, this projector PJ5 has the same external appearance as the projector PJ4 of the fourth embodiment, so its illustration is omitted. This projector PJ5 is different from the projector PJ4 in the fourth embodiment in that the detection unit 130C is replaced with the detection unit 130D.
[0117] The detection unit 130D has 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 oscillator circuit 512 in synchronization with the start signal ST output by the time measurement control circuit 542 of the time measurement unit 540. The generated ultrasonic signal is amplified by the amplifier circuit 514 and tr...
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