JP2003149737A - Display device - Google Patents

Abstract

(57) [Summary] [Problem] To secure safety even if a wrong lamp replacement method is adopted. SOLUTION: A projection is provided on an opening / closing lid when replacing a lamp provided on a housing, a detection switch is provided on a lamp unit insertion portion of an optical engine unit, and a leaf spring is provided on the lamp unit. At this time, the detection switch operates only when the lamp unit is inserted and the lid is further closed, and the power supply does not start unless the lid or the lamp unit is inserted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display optical system section for projecting an image on a screen by using a light valve element or a display element such as a liquid crystal panel or an image display apparatus provided with the display optical system section. For example, the present invention relates to a liquid crystal projector device, a liquid crystal television, a projection display device, and the like.

[0002]

2. Description of the Related Art Conventionally, light from a light source such as a lamp is adjusted by changing the density of each pixel by a light valve element or a display element such as a liquid crystal panel, and projection is performed on a liquid crystal projector or the like for enlarging and projecting an image on a screen or the like. Type display devices are known. A large voltage is required to start a lamp, which is a light source of a projection display device such as a liquid crystal projector, and an electric charge is stored in a capacitor on a power supply board and the electric current is suddenly applied to the positive and negative electrodes in the lamp tube. Discharges and lights up. After that, it always lights up with a stable constant voltage. It is known that the temperature of the lamp tube of the above-mentioned lamp becomes close to 1000 ° C., and it becomes extremely high including optical parts such as a reflector for reflecting light. Therefore, as a matter of course, it is important for the user to regulate the safety in terms of both electric shock and burn. In general, the structure of the lamp including the reflector is wrapped in a case so that the user does not touch it easily when the lamp is turned on. Conventionally, as a safety technique of this type, for example, at the time of lamp replacement, an opening / closing lid provided in the housing is provided with a detection unit for detecting opening / closing, and the lamp power is detected by detecting the opening / closing of the lid. A lamp box device for turning off is disclosed in Japanese Patent Laid-Open No. 2001-57295. Also, when replacing the lamp, with the power cord connected to the device, it is not possible to remove the lid that covers the opening for inserting and removing the lamp holder that wraps the lamp,
Japanese Patent Application Laid-Open No. 10-268425 discloses an interlock structure in which a power cord cannot be connected to an apparatus unless it is covered with a lid for insertion and removal.

[0003]

Although there have been many mechanical proposals using an interlock or the like for lamp replacement, the mechanism itself is complicated and there are many items to be solved in terms of reliability and weight. .

In Japanese Unexamined Patent Application Publication No. 2001-57295, separate switches are required to detect the presence / absence of the lid of the lamp replacement portion and the presence / absence of the lamp.
In Japanese Patent Laid-Open No. 25, a complicated interlock mechanism was required.

The object of the present invention is to solve the above problems,
An object of the present invention is to provide a display device having a mechanism that can ensure safety when replacing a lamp with a simple configuration.

[0006]

In the present invention, in order to solve the above-mentioned problems, the light intensity of light from a removable illumination means is modulated by a display device with a video signal and enlarged by a projection lens to form an image. In a display device having an accommodation unit for the illumination means and an accommodation unit lid having an optical unit for displaying, a protrusion member, an elastic member elastically displaced by the protrusion member, and an active switch by elastic displacement of the elastic member. Detection switch means and a control means for detecting the active state of the detection switch means and controlling the light emission of the illuminating means, and the projection member, the elastic member and the detection switch means The storage unit cover of the means, the lighting unit, and the optical unit are arranged so as to correspond to each other, and the presence or absence of the lighting unit and the opening / closing of the storage unit cover are detected at the same time. To.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. It should be noted that constituent elements common to the respective drawings are designated by the same reference numerals.

FIG. 1 is a schematic view for explaining the function of a display optical system section of a display device according to an embodiment of the present invention, and FIG. 2 is an overall view of a liquid crystal projector which is an embodiment of a display device according to the present invention. Show.

In FIG. 1, reference numeral 2 is a display optical system section (hereinafter,
An optical unit) is composed of a lamp unit 4 which is a lighting device, a display element (not shown) such as a liquid crystal, and a projection lens (not shown), and the light from the lamp unit 4 is converted into a video signal by the display element. The light intensity is modulated and the image is displayed by enlarging it with a projection lens. The optical unit 2 inside the liquid crystal projector 1 shown in FIG. 2 detects the presence / absence of the lamp unit 4 and the opening / closing lid 8 that is a lid for the housing portion of the lamp unit 4, and turns on / off the lamp power supply of the liquid crystal projector 1. A detection switch 3 for interlocking the lamp unit 4 is provided, and after inserting the lamp unit 4 having the leaf spring 6 into the insertion portion 5 of the optical unit 2, the leaf spring 6 provided in the lamp unit 4 is pushed to detect the detection switch 3 The liquid crystal projector 1 is configured so as to cover an opening / closing lid 8 having a protrusion 7 for operating the.

FIG. 3 is an exploded view showing the lamp unit 4 and the opening / closing lid 8 removed from the liquid crystal projector 1.
As shown in FIG. 3, the lamp unit 4 can be detached from the liquid crystal projector 1 by opening the opening / closing lid 8 for replacement.

FIG. 4 is a detailed view of the lamp unit and the opening / closing lid,
FIG. 5 is a simplified diagram for explaining the detailed functions of the present invention.
In FIG. 4, a detection switch 12 is provided in an insertion portion 11 into which a lamp unit 10 having a thin plate-shaped leaf spring 9 made of, for example, a metal and formed of an elastic member, which is a part of an optical unit, is inserted. In addition, the opening / closing lid 14 is provided with a protrusion 13 that operates (elastically displaces) the leaf spring 9. In FIG. 4, unlike FIG. 1, the leaf spring, the protruding portion, and the detection switch are arranged so as to be horizontally inverted, but it is obvious that the left and right inversion does not affect the detection operation of the detection switch described below. Is.

FIG. 6 is a schematic diagram of a circuit block for controlling ON / OFF of the lamp power supply by the detection switch. Figure 6
4, the detection switch section 50 is mechanically combined with the protrusion 13 of the opening / closing lid 14, the leaf spring 9 of the lamp unit 10 and the detection switch 12 of the insertion section 11, as shown in FIG. Will be described later, the protrusion 13
Then, the leaf spring 9 is pushed to operate the detection switch 12. The control means 51 composed of a micro computer or the like detects ON / OFF of the detection switch 12 of the detection switch section 50 and controls ON / OFF of the lamp driving power supply 52 based on the detection result, thereby controlling the lamp. The drive of the lamp 53 in the unit 10 is controlled.

The detection operation of the detection switch 12 will be described below with reference to FIG. In FIG. 5A, the lamp unit 10 including the leaf spring 9 is inserted into the insertion portion 11 which is a part of the optical unit. In this case, the open / close switch section 15 of the detection switch 12 arranged in the insertion section 11 is not in contact with the leaf spring 9. That is, the detection switch 12 does not operate.

Next, in FIG. 5B, FIG.
The state in which the opening / closing lid 14 is further attached is shown from the state. In this case, the protrusion 13 on the opening / closing lid 14 pushes the upper end 16 of the leaf spring 9 to deform (elastically displace) the leaf spring 9, and this deformation opens and closes the detection switch 12 disposed in the insertion portion 11. The switch unit 15 is pressed. That is, the detection switch 12 is turned on and the lamp is turned on.

Next, in FIG. 5C, the opening / closing lid 14 having the insertion portion 11 and the protrusion 13 of the lamp unit 10 having the detection switch 12 is closed without the lamp unit 10 being inserted. Is shown. In this case, the open / close switch unit 15 of the detection switch 12 is in an open state, that is, turned off, and the lamp unit 10 is inserted into the insertion unit
If it is not inserted at 1, the power of the lamp is turned off.

As described above in the embodiments of the present invention, the on / off operation of the detection switch 12 is determined by the combination of the protrusion 13, the leaf spring 9, and the detection switch 12. When the lamp unit 10 and the opening / closing lid 14 are mounted on the liquid crystal projector 1, the protrusion 13 and the leaf spring 9 are combined to turn on the detection switch 12, and the control means 51 detects this on and turns on the lamp driving power supply 52. When driven, the lamp 53 in the lamp unit 10 lights up. That is, with a simple combination of the protrusion 13, the leaf spring 9, and the detection switch 12, the safety at the time of lamp replacement can be ensured.

Next, the second embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. In the second embodiment, the protrusion for pushing the leaf spring is arranged in the insertion portion, and the detection switch is arranged in the opening / closing lid.

In FIG. 7, an insertion portion 19 for inserting a lamp unit 18 having a leaf spring 17, which is a part of the optical unit, has a protrusion 20. On the other hand, the opening / closing lid 21
A detection switch 22 that controls the on / off of the lamp power source is provided in the.

The detection operation of the detection switch 22 will be described with reference to FIG. 8 (a), (b), (c),
It is a perspective view which shows the function in the 2nd Embodiment of this invention shown in the said FIG. In FIG. 8A, a lamp unit 18 including a leaf spring 17, which is a part of an optical unit, is inserted into an insertion portion 19. In this case, the protrusion 20 of the insertion portion 19 pushes the bottom surface portion 23 of the leaf spring 17 but does not have the detection switch 22. As a result, the detection switch 22 is not touched and the lamp is turned off. .

Next, FIG. 8B shows the above-mentioned FIG. 8A.
The state in which the opening / closing lid 21 equipped with the detection switch 22 is combined with the above state is shown. In this case, the bottom portion 23 of the leaf spring 17 included in the lamp unit 18 is pushed by the protrusion 20 of the insertion portion 19, and the open / close switch portion 24 of the detection switch 22 disposed on the open / close lid 21 is further connected to the tip portion of the leaf spring 17. 25 is pushing. That is, the lamp power is turned on.

Next, FIG. 8C shows a state in which the opening / closing lid 21 having the detection switch 22 on the insertion portion 19 having the protrusion 20 is closed without the lamp unit 18 being inserted. Even in this case, since the open / close switch unit 24 of the detection switch 22 is in the open state, the power source for the lamp is in the off state. That is, as in the above-described embodiment, when the lamp unit 18 is not inserted into the insertion portion 19, the lamp power is turned off.

The effects of the second embodiment are the same as those of the first embodiment, and hence the description of the effects of the second and subsequent embodiments will be omitted.

Next, a third embodiment of the present invention will be described with reference to FIGS. 9 and 10. In the third embodiment, as shown in FIG. 9, the opening / closing lid 27 has the protrusion 26, the lamp unit 28 has the detection switch 31, and the insertion portion 29 has the leaf spring 30.
It is configured to include.

FIGS. 10A, 10B, and 10C are perspective views showing the function of the third embodiment of the present invention shown in FIG. FIG. 10A shows the detection switch 31.
The lamp unit 28 provided with is inserted in the insertion portion 29 having the leaf spring 30. In this case, since no force is applied to the leaf spring 30, the back surface portion 32 of the leaf spring 30 does not push the open / close switch portion 33 of the detection switch 31. That is, the power supply of the lamp is off.

Next, FIG. 10 (b) is a perspective view showing a state in which the opening / closing lid 27 having the protrusion 26 is closed in the state of FIG. 10 (a). In this case, the lamp unit 28 in which the detection switch 31 is arranged in the insertion portion 29 provided with the leaf spring 30.
By inserting, and further closing the opening / closing lid 27, the protrusion 26 pushes the tip end portion 34 of the leaf spring 30, and the back surface portion 32 of the leaf spring 30 pushes the opening / closing switch portion 33 of the detection switch 31. That is, the lamp power is turned on.

Next, FIG. 10 (c) shows a state in which the opening / closing lid 27 having the protrusion 26 is closed without inserting the lamp unit 28 into the insertion portion 29 provided with the leaf spring 30. In this case, the tip 34 of the leaf spring 30 is attached to the opening / closing lid 27.
Since the protrusion 26 is pushed but the detection switch 31 itself is not present, the lamp is turned off. That is,
Similar to the previous embodiment described above, the lamp unit 28
When is not inserted into the insertion portion 29, the lamp is turned off.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 11 and 12.

In FIG. 11, according to the structure of the present invention, an opening / closing lid 36 having a protrusion 35, a lamp unit 38 having a protrusion 37, and an insertion portion 39 for inserting the lamp unit 38 are provided with a detection switch 40. The leaf spring 41 is provided.

FIGS. 12A, 12B and 12C are perspective views showing the function of the fourth embodiment of the present invention shown in FIG. FIG. 12A shows the detection switch 4
0 shows a state in which the lamp unit 38 having the protrusion 37 is inserted into the insertion portion 39 provided with 0 and the leaf spring 41. In this case, the tip end surface 42 of the leaf spring 41 on the side closer to the lamp unit 38 contacts the inclined surface 43 of the projection 37 of the lamp unit 38, and the leaf spring 41 is slightly inclined. However, it represents a state in which the opening / closing switch portion 44 of the detection switch 40 has not been contacted. That is, the power of the lamp is off, and the power cannot be turned on only by turning on the lamp.

Next, FIG. 12 (b) shows the above-mentioned FIG.
It shows a state in which the open / close lid 36 having the protrusion 35 is closed in the state of (a). In this case, the tip end surface 42 of the leaf spring 41 provided in the insertion portion 39 is connected to the projection 3 of the lamp unit 38.
7 shows a state in which the leaf spring 41 is slightly pushed and the protrusion 35 of the opening / closing lid 36 is pushing the other tip surface 45 of the leaf spring 41. The cylindrical portion 46 is in a state of pressing the open / close switch portion 44 of the detection switch 40. That is, the lamp power is turned on.

Next, FIG. 12C shows a detection switch 40.
The lamp unit 3 is attached to the insertion portion 39 provided with the plate spring 41 and
8 is not inserted, the opening / closing lid 36 having the protrusion 35 is
It shows a state where they are arranged. In this case, leaf spring 4
Since 1 does not push the protrusion 37 of the lamp unit 38 slightly, it does not come into contact with the protrusion 35 of the opening / closing lid 36. As a result, the opening / closing switch 44 of the detection switch 40 has a leaf spring 41. Since the cylindrical portion 46 of the lamp does not contact, the power of the lamp is turned off. That is, as in the above-described embodiment, when the lamp unit 38 is not inserted into the insertion portion 39, the lamp power is turned off.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 13 (a) and 13 (b). In the fifth embodiment of the present invention, the protrusion for pushing the leaf spring, which is required in the above-mentioned four embodiments of the invention, is eliminated, and the same effect is realized only by the leaf spring.

As shown in FIG. 13 (a), in the fifth embodiment, an opening / closing lid 56, a lamp unit 55 having a leaf spring 54, and a detection switch 57 for inserting the lamp unit 55 are inserted. This is a configuration including the unit 59.

FIG. 13A shows a state in which the opening / closing lid 56 is opened and the leaf spring 54 is not pushed, and the leaf spring 54 is not deformed. Therefore, the leaf spring 54 is not in a state of pressing the open / close switch portion 58 of the detection switch 57, that is, the power source of the lamp is in an off state.

Next, in FIG. 13B, the opening / closing lid 56 is shown in a closed state, and the leaf spring 54 is deformed by the opening / closing lid 56. Due to the deformation of the leaf spring 54, the open / close switch portion 58 of the detection switch 57 is pushed by the leaf spring 54 and the detection switch 57 is turned on. Therefore, the power of the lamp is turned on.

The fifth embodiment has a simple structure in which the protrusions required in the four embodiments of the invention are eliminated,
It is possible to detect the presence or absence of a lamp and to ensure safety.

[0037]

As described above, according to the present invention, it is possible to detect the lamp and the lamp replacement lid relating to the lamp replacement by one detecting means with a simple mechanism and a small space. It is possible to control ON / OFF of the lamp power supply of the display device. Therefore,
It is possible to provide a display device capable of ensuring safety even if the user or the operator replaces the lamp by mistake.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an optical system of a display device according to the present invention.

FIG. 2 is a perspective view showing an appearance of a display device according to the present invention.

FIG. 3 is a perspective view showing an exploded configuration of a lamp unit and an opening / closing lid of the display device according to the present invention.

FIG. 4 is a perspective view showing the configuration of the display device according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing functions of the display device according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram of a circuit block that controls ON / OFF of a lamp power supply by a detection switch.

FIG. 7 is a perspective view showing a configuration of a display device according to a second embodiment of the present invention.

FIG. 8 is an explanatory diagram showing functions of the display device according to the second embodiment of the present invention.

FIG. 9 is a perspective view showing a configuration of a display device according to a third embodiment of the present invention.

FIG. 10 is an explanatory diagram showing functions of the display device according to the third embodiment of the present invention.

FIG. 11 is a perspective view showing a configuration of a display device according to a fourth embodiment of the present invention.

FIG. 12 is an explanatory diagram showing functions of the display device according to the fourth embodiment of the present invention.

FIG. 13 is an explanatory diagram showing functions of the display device according to the fifth embodiment of the present invention.

[Explanation of symbols]

1 ... Display device, 2 ... Optical unit, 3 ... Detection switch,
4 ... Lamp unit, 5 ... Lamp unit insertion part, 6 ...
Leaf spring, 7 ... protrusion, 8 ... open / close lid, 9 ... leaf spring, 10 ...
Lamp unit, 11 ... Lamp unit insertion part, 12 ...
Detection switch, 13 ... Projection, 14 ... Open / close lid, 15 ... Open / close switch, 16 ... Tip of leaf spring 9, 17 ... Leaf spring, 18 ... Lamp unit, 19 ... Lamp insertion section, 20
... protrusion, 21 ... open / close lid, 22 ... detection switch, 23 ...
Bottom part of leaf spring 17, 24 ... Open / close switch section, 25 ... Tip of leaf spring 17, 26 ... Protrusion, 27 ... Open / close lid, 28
... Lamp unit, 29 ... Lamp unit insertion part, 30
... leaf spring, 31 ... detection switch, 32 ... back surface of leaf spring 30, 33 ... opening / closing switch portion, 34 ... tip end surface of leaf spring 30, 35 ... protrusion, 36 ... opening / closing lid, 37 ... protrusion, 38
… Lamp unit, 39… Lamp unit insertion part, 40
... Detection switch, 41 ... Leaf spring, 42 ... Leaf spring, tip inclined surface of 41, 43 ... Inclined surface of protrusion 37, 44 ... Open / close switch section, 45 ... Tip inclined surface of leaf spring 41, 46 ... Leaf spring 41 Cylindrical surface, 50 ... Detection switch section, 51 ... Control means, 52 ... Lamp driving power source, 53 ... Lamp, 54 ... Leaf spring, 55 ... Lamp, 56 ... Open / close lid, 57 ... Detection switch, 58 ... Open / close switch section , 59 ... Lamp unit insertion part.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mikio Shiraishi             292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Ceremony Hitachi Digital Media System             Within the business division F term (reference) 2H088 EA12 HA07 HA28 MA20                 5C058 AA06 AB06 BA35 EA02 EA51

Claims (9)

[Claims] Claim: What is claimed is: 1. An optical unit, comprising: an optical unit that modulates the intensity of light from a detachable illuminating means with a video signal by a display element and enlarges it with a projection lens to display it as an image. In a display device having a lid, a protrusion member, an elastic member elastically displaced by the protrusion member, a detection switch means for switching to an active state by elastic displacement of the elastic member, and an active state of the detection switch means are detected. And a control means for controlling the light emission of the illuminating means, the protrusion member, the elastic member, and the detection switch means in the housing cover of the illuminating means, the illuminating means, and the optical unit, respectively. A display device, wherein the display devices are arranged so as to correspond to each other, and the presence / absence of the illumination means and the opening / closing of the housing cover are detected at the same time. 2. The detection switch means is provided in the optical unit, the elastic member is provided in the illuminating means, and the projecting member is provided in the housing cover.
Display device described. 3. The detection switch means is provided on the optical unit, the elastic member is provided on the housing cover, and the projection member is provided on the illumination means.
Display device described. 4. The detection switch means is the illumination means,
2. The display device according to claim 1, wherein the elastic member is provided in the housing cover and the protrusion member is provided in the optical unit. 5. The detection switch means is the illumination means,
The elastic member is provided on the optical unit, and the projecting member is provided on the storage section lid, respectively.
Display device described. 6. The detection switch means on the lid of the storage portion,
The display device according to claim 1, wherein the elastic member is provided on the optical unit, and the protrusion member is provided on the illumination means. 7. The detection switch means is provided on the lid of the storage portion,
The display device according to claim 1, wherein the elastic member is provided on the illuminating means, and the projecting member is provided on the housing cover. 8. An optical unit for light intensity modulation of light from a detachable illuminating means by a display element according to a video signal, and enlarging by a projection lens to display as an image, and a housing portion for the illuminating means. A display device having a lid, wherein an elastic member elastically displaced by closing a housing lid of the illumination means, a detection switch means for switching to an active state by elastic displacement of the elastic member, and the detection switch means And a control means for controlling the light emission of the illuminating means by detecting the active state of the illuminating means, the elastic member is provided in the illuminating means, and the detection switch means is provided in the optical unit, and the illuminating means also serves as a lever. A display device having an elastic member, wherein the presence / absence of the illumination means and the opening / closing of the housing cover are simultaneously detected. 9. An optical unit for light intensity modulation of light from a detachable illumination means by a display element according to a video signal and magnified by a projection lens to display as an image. A display device provided with a lid, comprising: first and second projecting members, an elastic member elastically displaced by the first and second projecting members, and switching to an active state by elastic displacement of the elastic members. The detection switch means and the control means for detecting the active state of the detection switch means and controlling the light emission of the illumination means are provided, and the first protrusion member and the second protrusion member are provided in the housing portion of the illumination means. The elastic member and the detection switch means are disposed in the detection switch means, and the elastic member and the detection switch means are disposed so as to correspond to the lid and the lighting means, respectively. And the second protrusion is A display device characterized in that the elastic member is elastically displaced, and accordingly, the detection switch means is switched to an active state to detect that the illumination means and the storage section lid are mounted. .