JPH058556U - Projector - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a projection device that does not hurt the eyes even if the user accidentally looks into the projection lens during projection. Object [Construction] The present invention relates to an object detection means for detecting the presence or absence of an object within the irradiation range of a light flux by the projection device in a projection device which irradiates a light flux toward a screen and projects an image on the screen. And a light blocking unit that blocks the light flux when an object is detected by the object detection unit. The present invention also provides an object detection means for detecting the presence or absence of an object within the irradiation range of the light flux by the projection device in a projection device which projects a light flux toward the screen and projects an image on the screen, and the object detection means. And an attenuating means for reducing the luminous flux when an object is detected by. Further, the present invention relates to an object detection means for detecting the presence or absence of an object within the irradiation range of the light beam by the projection device in a projection device for projecting an image on the screen by irradiating the screen with a light beam from the light source. And an extinguishing means for extinguishing the light source when an object is detected by the detecting means.

Description

[Detailed description of the device]

[0001]

【Technical field】

  The present invention relates to a projection device such as a liquid crystal projector, and particularly to a screen. The present invention relates to a projection device that irradiates a light flux and projects an image on this screen.

[0002]

[Prior art and its problems]

  For example, a project for projecting an image on a screen with a light flux based on image information. Since the image is projected on a screen at a distant position, a very high luminous flux is illuminated. Shoot.

[0003]   Therefore, if a person accidentally looks into the projection lens during projection, this bright light will cause I could hurt my eyes. Especially recently, using projectors in homes Opportunities are increasing, and the risk of children accidentally looking into the projection lens is increasing.

[0004]

[The purpose of the device]

  In view of such a background, the present invention is designed so that even if the user accidentally looks into the projection lens during projection, It is an object of the present invention to provide a projection device that does not hurt the user.

[0005]

[Outline of the device]

  According to one aspect of the present invention, the light flux is directed toward the screen, In a projection device that projects an image cleanly, the irradiation range of the light flux by the projection device An object detection means for detecting the presence or absence of an object inside, and an object detected by this object detection means It is characterized by having a light blocking means for blocking the light flux when the light is turned off.

[0006]   According to another aspect of the present invention, the light flux is directed toward the screen, In a projection device that projects an image on a screen, the projection range of the light flux by the projection device An object detection unit that detects the presence or absence of an object inside the enclosure, and an object is detected by this object detection unit. And a dimming means for reducing the luminous flux when known.

[0007]   According to yet another aspect of the present invention, a light beam from a light source is directed toward a screen. A projection device for projecting an image on the screen by the projection device. The object detection means for detecting the presence or absence of an object within the irradiation range of the light flux, and the object detection means And an extinguishing means for extinguishing the light source when an object is detected. is doing.

[0008]

【Example】

  The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows a liquid crystal to which the present invention is applied. A projector 29 is shown, which is a parallel light emitted from a light source 10 which emits white illumination light. The bundle is reflected by the cold mirror 11, and then the R dichroic mirror 12 and the B It is reflected and separated by the dichroic mirror 13.

[0009]   The R dichroic mirror 12 reflects only the R (red) component, and the reflected light is After being reflected by the aluminum mirror 14, the light enters the R liquid crystal unit 15. R liquid crystal unit The light flux exiting the lens 15 passes through the B dichroic mirrors 16 and B ( After passing through the G dichroic mirror 17 that transmits the blue component and the R component, It enters the shadow lens 18.

[0010]   The B dichroic mirror 13 reflects only the B component, and the reflected light is the B liquid crystal. It is incident on the unit 20. The luminous flux emitted from the B liquid crystal unit 20 is B dichroic. After being reflected by the mirror 16 and transmitted through the G dichroic mirror 17, the projection lens 1 It is incident on 8.

[0011]   On the other hand, it passes through the R dichroic mirror 12 and the B dichroic mirror 13. The generated light flux enters the G (green) liquid crystal unit 21, and is reflected by the aluminum mirror 22 and the G mirror. After being reflected by the icroic mirror 17, the light enters the projection lens 18.

[0012]   The R liquid crystal unit 15 includes an R liquid crystal panel 15P and an output of the R liquid crystal panel 15P. It has a condenser lens 15L arranged on the shooting side. Similarly, B liquid crystal unit The panel 20 is disposed on the B liquid crystal panel 20P and on the emission side of the B liquid crystal panel 20P. The G liquid crystal unit 21 has a condenser lens 20L and a G liquid crystal panel 21P. And a condenser lens 21L arranged on the exit side of the G liquid crystal panel 21P. is doing. The R liquid crystal panel 15P outputs the red image information of the color image to be projected. B liquid crystal panel 20P outputs blue image information, and G liquid crystal panel 21P outputs green. Output color image information. Then, these image information are superposed by the above optical system. They are combined and projected on the screen via the projection lens 18.

[0013]   The condenser lenses 15L, 20L and 21L are respectively the liquid crystal panel 15P. , 20P and 21P on the exit side. That is, the condenser lens 1 The parallel light flux from the light source 10 is incident on the 5L, 20L, and 21L, and accordingly, They do not cause the transmittance change (decrease) depending on the angle of the light ray. Also these The condenser lenses 15L, 20L and 21L correspond to the corresponding liquid crystal panel 15P, The light fluxes transmitted through 20P and 21P are focused on the pupil of the projection lens 18, respectively. .

[0014]   The liquid crystal projector 29 includes an object detection sensor (object detection means) 30, a controller. It has a laser 31 and a light beam blocking shutter 32. This object detection sensor 30 For example, a pyroelectric sensor or an ultrasonic sensor can be used. With pyroelectric sensor Is a so-called infrared sensor used for indoor alarms, etc., and emits infrared rays. Outputs an object detection signal when the steady state changes due to people entering the detection range To do. In addition, the ultrasonic sensor may not detect when a person enters the detection range where ultrasonic waves are being emitted. Output the object detection signal based on extracting the change of the reflected ultrasonic wave. It The numeral 37 in FIG. 2 is emitted from the projection lens 18 to the front screen 35. The object detection sensor 30 has an irradiation range 3 of the projection lens 18. 7 and its detection range should be set so that they can be irradiated with infrared rays or ultrasonic waves. Has been.

[0015]   The controller 31 receives the detection signal from the object detection sensor 30 and shuts off the light flux. The data (light-shielding means) 32 is operated. The light flux blocking shutter 32 is a condenser lens. The light beams emitted from the lenses 15L, 20L and 21L are blocked. Of the condenser lenses 15L, 20L and 21L A plurality of them can be arranged, but in this embodiment, in order to simplify the configuration, each Only one light beam is positioned on the incident path to the projection lens 18 where these light beams are collected. .

[0016]   An example of the light flux blocking shutter 32 is shown in FIG. The light flux blocking shutter 32 is At the center of the annular plate 40 provided on the plate 39, there is a shutter blade composed of a plurality of shutter blades. It has a cutter section 41. A solenoid 42 is fixed to the substrate 39, and this solenoid The plunger 44 of the noid 42 has an operating lever pivotally attached to the base plate 39 by a pin 43. -45. The operating lever 45 is connected to the shutter portion 41. And when the solenoid 42 is turned off, it is rotated by a spring (not shown). When the shutter 41 is opened and the solenoid 42 is turned on, the plunger 44 The rotation causes the shutter portion 41 to close.

[0017]   Therefore, the liquid crystal projector 29 projects the image on the front screen 35. If a person (object) 36 enters the irradiation range 37, the object detection The sensor 30 detects this and outputs an object detection signal. Then, the controller 31 Receives this signal and turns on the solenoid 42 of the light beam blocking shutter 32, The lens 41 is closed, and the light enters the pupil of this lens 18 immediately before the projection lens 18. The light flux that is blocked is blocked. These light beam blocking operations are performed by the person 3 using the object detection sensor 30. Since it is executed immediately after the detection of 6, even if the person 36 looks into the projection lens 18, The light can be blocked later, so if you look into the projection lens 18 and hurt your eyes It is possible to reliably prevent such problems. Liquid crystal panels 15P and 20P And 21P, the transmittance is black immediately after the detection of the person 36 by the object detection sensor 30. It is also possible to configure the circuit so that it is as close as possible to the level, and use this as a shading means. it can.

[0018]   Further, in the present embodiment, the light flux is blocked based on the object detection of the object detection sensor 30. However, as shown in FIG. 4, for example, at the same position as the light beam blocking shutter 32, At the time of its operation, a light amount reduction filter such as an ND filter or a color filter is placed in the optical path A dimming device (dimming means) 46 that can be positioned is arranged to dimm the light based on object detection. You can also do it. That is, when the object detection sensor 30 detects an object, The controller 31 based on the body detection signal operates the dimming device 46 to project the projection light. The amount of light incident on the pixel 18 is reduced, and the brightness is kept low. In addition, dimming It is also possible to use a light-reducing member made of mesh for the device 46. It is also possible to use a diaphragm arranged concentrically with O.

[0019]   Furthermore, the liquid crystal panels 15P, 20P and 21P are controlled so as to approach the black level. However, this can also be used as a dimming means. Also, if the projector is a CRT If it is a vector, it may be controlled so as to increase the density of the CRT screen.

[0020]   When the object detection sensor 30 detects an object as shown in FIG. The power supply to the light source 10 is stopped and turned off by the trawler 31, and the projection lens 18 It can also be configured so that it cannot be irradiated from above. Also, if the power supply is stopped Alternatively, it is possible to reduce the supply voltage by reducing the supply voltage. However, this configuration is It is not suitable for a light source that has little voltage dependence of.

[0021]   1 to 5, the present invention is applied to the liquid crystal projector 29. As described above, the present invention provides a CRT project as shown in FIGS. 6 and 7. It can also be applied to FIG. 6 shows a so-called three-tube CRT projector 47, which is arranged in a line. Light flux of three colors of red, green and blue emitted from the three CRTs 51, 52 and 53 arranged. Are combined on the screen 35 to obtain a color image. C shown in FIG. The RT projector 49 uses the dichroic mirrors 55 and 56 to provide three CRs. The red, green, and blue light fluxes emitted from T51, 52, and 53 are combined into a condensate. Irradiation from the lens 57 to the screen 35 (FIG. 6) to obtain a color image. It is a thing. Therefore, even in the CRT projector 47 of FIG. 6, the CR of FIG. Also in the T projector 49, one object detection sensor is sufficient, but , In the CRT projector 47, the CRTs 51, 52, and 53 have light-shielding means, The CRT projector 49 is provided with a dimming means or an extinguishing means so that the projection lens 57 is close to it. A light-shielding means and a dimming means are provided beside it. Further, the extinguishing means are CRTs 51, 52, 53. Provide for each.

[0022]   In this embodiment, a person 36 enters the irradiation range 37 and the object detection sensor 30 detects it. It was configured to block, dimming, or turn off when informed, but blocking, dimming, or turning off After that, when the person 36 leaves the irradiation range 37, that is, the detection range of the object detection sensor 30. When it is out of the enclosure, the shutter portion 41 of the light flux blocking shutter 32 is opened, or The dimming device 46 is returned to the state before dimming, or the power supply to the light source 10 is restarted. Therefore, the irradiation from the projection lens 18 may be returned to the original state.

[0023]

[Effect of device]

  As described above, the projection device of the present invention is designed to When an object is detected by this object detection means and the object detection means that detects the presence or absence Since it has a light-shielding means for shielding the light flux of the projection device, the projection lens If you look into the camera, the person is detected as an object that has entered the luminous flux irradiation range and immediately projected. The light flux from the lens can be blocked. This allows the projection lens to You can certainly eliminate the risk of accidentally peeping your eyes.

[0024]   According to the projection device of claim 2, when the projection lens is accidentally looked into during projection, The person is detected as an object within the luminous flux irradiation range, and the luminous flux from the projection lens is immediately detected. Since it is possible to diminish the light, it surely prevents the trouble that the person who peeked will hurt the eye. be able to.

[0025]   Furthermore, according to the projection device of claim 3, when the projection lens is accidentally looked into during projection. However, the person is detected as an object that has entered the irradiation range of the light flux, and the light source is immediately turned off. You can This ensures that there is no risk of eye injury looking into the projection lens. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optical system showing an example of a projection apparatus to which the present invention is directed.

FIG. 2 is a diagram schematically showing a state at the time of projection by the projection device of FIG.

FIG. 3 is a front view showing a light flux blocking shutter usable in the projection device of FIG.

FIG. 4 is a block diagram of an optical system showing another embodiment of the projection apparatus of the present invention.

FIG. 5 is a configuration diagram of an optical system showing still another embodiment of the projection apparatus of the present invention.

FIG. 6 is a configuration diagram of an optical system showing a three-tube CRT projector to which the present invention can be applied.

FIG. 7 is a configuration diagram of an optical system showing a CRT projector using a dichroic mirror to which the present invention can be applied.

[Explanation of symbols]

10 light sources 12 13 16 17 Dichroic mirror 15 20 21 LCD unit 15P 20P 21P liquid crystal panel 15L 20L 21L Condenser lens 18 Projection lens 29 LCD projector 30 Object detection sensor (object detection means) 31 Controller 32 Luminous flux blocking shutter (light blocking means) 35 screen 36 people (object) 37 Luminous flux irradiation range 46 Dimmer (dimming means) 47 3-tube CRT projector 49 CRT projector 51 52 53 CRT 55 56 dichroic mirror 57 Projection lens

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Creator Takayuki Iizuka             2-36 Maeno-cho, Itabashi-ku, Tokyo Asahikou             Gaku Kogyo Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A projection device for irradiating a screen with a light beam and projecting an image on the screen, and object detection means for detecting the presence or absence of an object within a range of irradiation of the light beam by the projection device; A projection device that blocks the light flux when an object is detected by the projection device. 2. A projection device for irradiating a screen with a light beam and projecting an image on the screen, and object detection means for detecting the presence or absence of an object within the range of irradiation of the light beam by the projection device; And a dimming unit that reduces the light flux when an object is detected by the projection device. 3. A projection device for irradiating a light beam from a light source onto a screen and projecting an image on the screen, and object detection means for detecting the presence or absence of an object within the range of irradiation of the light beam by the projection device; A projection device comprising: a light-off means for turning off the light source when an object is detected by the detection means.