JP4552416B2 - Projection display - Google Patents

Description

  The present invention relates to a lamp cartridge including a lamp and a housing for storing the lamp, and a projection display device including the lamp cartridge.

  In the conventional projection type display device, the moving direction of the light source unit to which the light source is mounted is a rotational movement method, and the rotation angle of the light source unit is set to about 180 degrees for normal rotation / inversion, respectively, and is moved by the rotational reciprocation method. Further, a light source replacement hole is formed only on the side opposite to the light emission position of the light source approximately 180 degrees, and the light source can be replaced from this one place (for example, Patent Document 1).

  Conventionally, in the projection display device or the like, a lamp used as a light source is cooled by an axial fan. Therefore, the housing for storing the lamp has a rectangular cross-sectional shape that is larger than the opening diameter of the reflector over the entire length of the housing so that more air blown from the axial fan can be taken into the housing. It was necessary to have (for example, patent document 2 and patent document 3).

JP 2001-264878 A (page 1-3, FIG. 1) JP 2002-245842 (page 1-6, FIG. 1) Registered Utility Model No. 3091812 (Fig. 3)

Therefore, there has been a limit to downsizing the conventional lamp cartridge (in the following description, the lamp cartridge including the lamp and the housing is referred to as a lamp cartridge).

Further, in the conventional projection display device, since the lamp housing to be used has a rectangular cross-sectional shape larger than the diameter of the opening of the reflector as described above, a plurality of lamp cartridges are provided in the light source portion of the projection display device. When provided individually, there was a problem that a light source part enlarged. For example, in the case of the projection display device described in Patent Document 1, since two lamp cartridges are provided, the light source unit of the projection display device requires a space that is twice or more the opening diameter of the reflector. Was. Therefore, since it is difficult to reduce the size of the light source unit, there is a limit to downsizing the projection display device.

  The present invention has been made to solve the above-described problems, and provides a small lamp cartridge and a small projection display device.

Projection display device according to the invention this consists lamp, is formed to surround the lamp around the optical axis of the lamp comprise a reflector, the angle of the reflecting surface of the reflector with respect to the said optical axis The first and second angles are approximately the same angle with respect to the optical axis and have substantially the same length as the entire length of the lamp, and are provided symmetrically about the optical axis. a housing configured to include a sloped portion, a plurality of lamp cartridge a connector connected to a power supply cable is provided in the recess of the second inclined portion, the second inclined part in one of the lamp cartridge and such that the first inclined portion in the other of said lamp cartridge is opposite from and close to each other, a light source unit having a rotatable turntable having a plurality of said lamp cartridge is disposed For example, a plurality of the lamp cartridge is equal to or is detachable from said turntable individually.

  According to the lamp cartridge of the present invention, the lamp cartridge can be reduced in size.

  Further, according to the projection display device of the present invention, the projection display device can be miniaturized.

Embodiment 1 FIG.
FIG. 1 is a top view of the projection display apparatus according to the first embodiment. FIG. 2 is a cross-sectional view of the main part when viewed from the AA cross section in FIG. 1, and a one-dot chain line in FIG. 2 is a central axis of an optical path through which light passes through the projection display device.

  In the projection display device shown in FIGS. 1 and 2, light is emitted from one of the two lamps provided in the projection display device. The two lamps are fixed in lamp cartridges 33 and 35 detachably mounted on a turntable 31 described later.

  In the following description, the lamp cartridge 33 is referred to as a first lamp cartridge 33, and the lamp 32 fixed in the first lamp cartridge 33 is referred to as a first lamp 32. Similarly, the lamp cartridge 35 is referred to as a lamp lamp 35. Is referred to as a second lamp cartridge 35, and the lamp 34 fixed to the second lamp cartridge 35 is referred to as a second lamp 34.

  The light emitted from the first lamp 33 is collected by the optical system 4 provided in the irradiation direction of the light. The condensed light is reflected by the reflection mirrors 9 and 10 and enters the prism 6. The prism 6 refracts or transmits the light according to the incident angle of the incident light, and enters the light valve 7.

  The light valve 7 is fixed to the base 1, and a DMD (Digital Micromirror Device) element or the like that changes the attitude angle of the micromirror corresponding to the image display pixel in accordance with an input image signal is used. The light incident on the light valve 7 is reflected by the micromirror or the like and enters the projection lens 8. The DMD is a trademark of Texas Instruments (TI).

  The light incident on the projection lens 8 is projected from the projection lens 8 onto a screen or the like (not shown), whereby an image or the like corresponding to the image signal is obtained.

  The light emitted from the first lamp 32 is reflected by the micromirror in the light valve 7 as described above, but is reflected from the micromirror corresponding to the black portion in the image obtained from the image signal. The light is reflected so as not to enter the projection lens 8. In the following description, the light reflected by the micromirror so as not to enter the projection lens 8 is referred to as OFF light.

  As described above, the OFF light does not enter the projection lens 8. Therefore, in the projection display device according to the first embodiment, it is determined whether or not the light amount of the lamp 32 has decreased using this OFF light. Specifically, a luminance sensor 45 is provided at a position where the OFF light can be received, and the OFF light is received by the luminance sensor 45. Actually, the material is selected so as to increase the light reflectance and surface roughness of the inner surface, and is incident from the incident hole 44 at one end of the reflecting tube 43 provided in the luminance sensor 45. The OFF light thus received is received by the luminance sensor 45. The OFF light is not light on the optical axis 5 of the optical system 4, but actually has the same light quantity as the light on the optical axis 5. Therefore, it is possible to determine whether or not the amount of light emitted from the projection lens 8 has decreased by using the OFF light.

  Since the luminance sensor 45 changes an electromotive current according to the luminance of received light, the control circuit 46a can calculate the amount of light from the first lamp 32 based on the electromotive current. Normally, in order for the brightness sensor 45 to receive the OFF light from the plurality of micromirrors, the ratio of white to black in the image to be projected is calculated from the image signal, and the light quantity is calculated. There is a need to do.

  As a result of calculating the light quantity based on the output from the brightness sensor 45, when the light quantity L becomes smaller than a predetermined threshold value L_MIN, the lamp used as the light source is the first lamp 32 or the second lamp. Switch to 34.

  FIG. 3 is a view showing the arrangement of the lamp cartridges 33 and 35 on the turntable 31 constituting the light source unit of the projection display device. As shown in FIG. 3, the lamp cartridges 33 and 35 have the same structure.

  Each of the lamp cartridges 33 and 35 includes the lamps 32 and 34 and a housing 90.

The housing 90 is substantially the same as an angle between the reflecting surface of the reflector 58 of the lamps 32 and 34 and the optical axes 55 and 56 of the lamps 32 and 34 (hereinafter, this angle is also referred to as an opening angle θ). It has a first side wall 53 and a second side wall 54 formed at an angle between the optical axes 55 and 56 of the lamps 32 and 34.

  The first side wall 53 and the second side wall 54 are formed over substantially the same length as the entire length L of the lamps 32 and 34 in the direction of the optical axes 55 and 56 of the lamps 32 and 34.

  Further, the first side wall 53 has a first recess 67, and the second side wall 54 has a second recess 68. In the turntable 31, the first lamp cartridge 33 and the second lamp cartridge 35 are the first side wall 53 or the second side wall 54 of the one lamp cartridge 33, 35 and the other lamp cartridge 35. , 33 are arranged so as to face each other. The lamp cartridges 33 and 35 are provided with a first power connector 69 (described later) in the first recess 67 or the second recess 68.

The first power connector 69 may be provided only on either the first side wall having the first recess 67 or the second side wall 54 having the second recess 68. , Both may be provided. Further, it may be provided on the turntable 31. In other words, the first power connector 69 may be provided in the gap formed by the recesses 67 and 68. Hereinafter, in the description of the first embodiment, a case where the first power connector 69 is provided only in the second recess 68 will be described.

  As described above, since the lamp cartridges 33 and 35 have the first side wall 53 and the second side wall 54, the lamp cartridges 33 and 35 are mounted on the turntable 31 as shown in FIG. Can be placed close together. Further, since the first power connector 69 is provided in the second recess 68, the lamp cartridges 33 and 35 can be arranged closer to each other.

  Then, the lamp cartridges 33 and 35 are placed on the turntable 31 so that the second side wall 54 of the first lamp cartridge 33 and the first side wall 53 of the second lamp cartridge 35 face each other. By disposing the lamp, the angle at which the turntable 31 is rotated when the lamp as the light source is switched from the first lamp 32 to the second lamp 34 is greatly reduced as compared with the conventional projection display device. be able to. Therefore, the turntable 31 can be reduced in size. Therefore, the projection display device can be reduced in size.

  Since the lamp cartridges 33 and 35 include the first side wall 53 and the second side wall 54, as shown in FIG. 4, the first side wall 53 and the second side wall are provided. The packaging box 83 can be reduced in size by storing it in the packaging box 83 so that the opening 54 of the reflectors 58 of the lamps 32 and 34 faces in the opposite direction. Accordingly, it is possible to reduce the amount of resources used as waste materials, such as the packing box 83 or the cushion 81 put in the packing box, the individual packaging box 82 that houses the lamp cartridge 33, and the like.

  FIG. 5 is a cross-sectional view of the main part when viewed from the EE cross section in FIG. FIG. 6 is a side view of the lamp cartridges 33 and 35 viewed from the Y-axis direction in FIG.

An electrode cable 64 corresponding to each of the positive electrode 61 or the negative electrode 63 in the lamps 32 and 34 is provided from the first power supply connector 69. The lamps 32 and 34 are supplied with current from the power supply circuits 46 b and 46 c described later via the first power connector 69 and the electrode cable 64, and discharge between the positive electrode 61 and the negative electrode 63. Emits light.

  FIG. 7 is a cross-sectional view of the main part viewed from the CC cross section in FIG. The lamps 32 and 34 in the lamp cartridges 33 and 35 arranged in the projection display device are lit by currents input from the corresponding power supply circuits 46b and 46c. That is, in FIG. 7, the current output from the second power supply circuit 46c corresponding to the second lamp 34 passes through the second power supply cable 60b, the first power supply connector 69, and the second power supply connector 52. The signal is input to the second lamp 34 from the electrode cable 64 connected to the positive electrode 61 of the second lamp 34.

  The first lamp 32 has a first power circuit 46b, a first power cable 60a, and an electrode cable (not shown) connected to the first power cable 60a via a connector (not shown). (Not shown) is provided.

  FIG. 8 is a cross-sectional view of an essential part of the projection display device taken along the line BB in FIG. The housing 90 of the lamp cartridges 33 and 35 is adjacent to the first side wall 53 and the second side wall 54, respectively, and a third side wall 91 and a second opening portion provided with a first opening 76 are provided. 79 has a fourth side wall 92 provided with 79.

In the projection display device, a centrifugal blower 78 such as a blower fan or a sirocco fan is used instead of the axial fan. In the centrifugal blower 78, outside air (hereinafter, the air outside the lamp cartridges 33 and 35 is also referred to as outside air) by the blow from the centrifugal blower 78 is provided on the third side wall 91. 1 so as to flow into one opening 76.

  The air in the first lamp cartridge 33 warmed by the heat generated by the first lamp 32 is caused by the outside air flowing into the first lamp cartridge 33 from the first opening 76 and the fourth side wall. The gas is discharged from the second opening 79 provided in 92. In the following description, the air discharged from the second opening 79 is also referred to as exhaust.

  The exhaust discharged from the second opening 79 passes through an air passage 37 a provided in the rotating plate 37 and reaches a lens barrel 4 b provided so as to surround the optical system 4. The rotating plate 37 constitutes a rotating mechanism for rotating the turntable in the projection display device, and the air passage 37a is provided as shown in FIG.

An unnecessary light reflection filter 4a and a lens 4c constituting the optical system 4 are disposed in the lens barrel 4b. The unnecessary light reflection filter 4 a prevents unnecessary light 5 a such as ultraviolet rays and infrared rays contained in the light emitted from the lamps 32 and 34 from reaching the light valve 7. Therefore, the unnecessary light reflection filter 4a is disposed with a predetermined angle α with respect to the optical axes 55 and 56.

  Usually, the temperature of the lens barrel 4b is increased by unnecessary light 5a such as ultraviolet rays or infrared rays reflected by the unnecessary light reflecting filter 4a, and therefore it is generally necessary to provide a blower for cooling the lens barrel 4b. . However, the projection display apparatus according to the first embodiment can cool the lens barrel 4b using the exhaust from the second exhaust port 79. Therefore, since it is not necessary to provide a blower for cooling the lens barrel 4b, the projection display device can be downsized.

  In the projection display device, since a centrifugal blower such as a blower fan or a sirocco fan, which has a higher static pressure, is generally used as compared with an axial fan, air is blown from the centrifugal blower rather than a conventional lamp cartridge. The air path for the outside air to flow into the lamp cartridge can be reduced. Therefore, the openings 76 and 79 in the lamp cartridges 33 and 35 in the first embodiment can be made small. Since the centrifugal blower has a high static pressure as described above, the lamps 32 and 24 are sufficiently cooled even with relatively small openings such as the openings 76 and 79 in the lamp cartridges 33 and 35. be able to. Further, by using the centrifugal blower, noise can be suppressed as compared with the case where the axial fan is used.

  A notch 70 is provided below the lamp cartridges 33 and 35 (in the following description, the direction opposite to the Z axis in FIG. 8 is also referred to as the lower side). The notch 70 is provided on the fourth side wall 92 by using the space between the lamps 32 and 34 and the fourth side wall 92.

Specifically, a first notch portion side wall 93 that forms the notch portion 70 in the fourth side wall 92 is provided substantially in parallel with the optical axes 55 and 56 of the lamps 32 and 34, and the lamp 32 and 34 are provided close to the electrode holding portion 62a. Then, one end of the second notch portion side wall 94 adjacent to the first notch portion side wall 93 is joined to the first notch portion side wall 93 within a range not contacting the reflector 58 of the lamps 32 and 34. Then, the other end is joined to the side wall forming the second opening.

  The notch 70 is provided with a circuit board 71, and the circuit board 71 is provided with a memory for storing the cumulative lighting time of the lamps 32 and 34, for example. A first circuit board cable 72 a is connected to the circuit board 71, and further, the first circuit board cable 72 a is connected to a first circuit board connector 73.

  Note that the circuit board 71 in the notch 70 is covered with a shield case 74 (described in FIG. 6) so as not to be affected by noise generated when the lamps 32 and 34 are lit.

As described above, the housing 90 is configured by the first side wall 53 and the second side wall 54 as in the lamp cartridges 33 and 35 in the first embodiment, so that the lamp is smaller than the conventional lamp cartridge. It can be a cartridge.

  In addition, by applying the lamp cartridges 33 and 35 to the projection display device, the light source part of the projection display device can be reduced in size, so that the projection display device can be reduced in size. Further, by downsizing the projection display device, it is possible to reduce the weight of the projection display device and reduce the installation space of the projection display device.

Embodiment 2. FIG.
FIG. 10 is a top view of the projection display apparatus according to the second embodiment. In addition, the same code | symbol is attached | subjected to the component similar to the projection type display apparatus in the said Embodiment 1, and description about the said component is abbreviate | omitted.

  On the turntable 31 of the projection display device according to the second embodiment, the second side wall 54 of the first lamp cartridge 33 and the second side wall 54 of the second lamp cartridge face each other. The lamp cartridges 33 and 35 are arranged on the turntable 31 so that the openings in the reflectors 58 of the lamps 32 and 34 face in opposite directions.

  In the projection display device according to the second embodiment, since the lamp cartridges 33 and 35 described in the first embodiment are used, even if the lamp cartridge is arranged in the same manner as the conventional projection display device, the conventional projection display device is concerned. Compared to the turntable in the projection type display device, the size can be reduced. Therefore, the projection display device can be reduced in size.

Embodiment 3 FIG.
FIG. 11 is a diagram showing a turntable 31 of the projection display device in the third embodiment. In the turntable 31 according to the second embodiment, the lamp cartridges 33 described in the first embodiment are radially arranged around the rotation shaft 50 of the turntable 31.

  In the projection display device described in the first embodiment, when one of the lamps 32 and 34 becomes unusable, the unusable lamps 32 and 34 must be replaced immediately. In the projection display device according to the second embodiment, the lamp cartridge 33 is arranged, so that even when one of the lamps 32 and 34 becomes unusable, the lamp cartridge that becomes unusable immediately is replaced. do not have to.

  For example, when it is not desirable to continue the unusable state of the lamps 32, 34 for a long time, such as for monitoring the projection display device, as many lamps 32, 34 as possible can be placed on the turntable. It is desirable to arrange on 31.

  Therefore, by using the lamp cartridges 33 and 35 described in the first embodiment as in the projection display device according to the second embodiment, more lamps can be arranged and the conventional ones can be arranged. The turntable 31 can be made smaller than when a lamp cartridge is used. Therefore, the projection display device can be reduced in size. Further, by downsizing the projection display device, it is possible to reduce the weight of the projection display device and reduce the installation space of the projection display device.

Embodiment 4 FIG.
The projection type display device changes the direction of the projection lens 8 depending on the application. For example, in the case where the distance from the projection display device to the screen cannot be sufficiently obtained due to the limitation of the space in the room or the like where the projection display device is installed, the projection lens 8 is set as shown in FIG. The image or the like is projected onto the screen by being reflected by a mirror (not shown) in the axial direction.

  On the other hand, in the case where a sufficient distance from the projection display device to the screen can be taken, the projection lens 8 is projected on the X axis and Z axis in FIG. Point in a vertical direction. In the following description, a direction perpendicular to the X axis and the Z axis is referred to as a Y axis direction.

  In the conventional projection display device, the direction in which the projection lens 8 is directed is changed by changing the direction of the entire projection display device in accordance with the application. Therefore, the rotation direction of the turntable 31 and the lamps 32 and 34 are changed. The direction of the gravity acting on the may coincide. In such a case, the torque required for the motor 41 increases.

  Therefore, in the projection type display device according to the third embodiment, the first and second points on the extension line of the optical axis 5 of the optical system 4 when the projection lens 8 is directed in the Z-axis direction as shown in FIG. The distance L1 between the base mounting surface 87, the point on the extension line of the optical axis 5 of the optical system 4 when the projection lens 8 is directed in the Y-axis direction as shown in FIG. The distance L2 between the base mounting surface 88 is made equal. FIG. 14 is a diagram showing the relationship between L1 and L2 as seen from the direction of the optical axis 5.

As described above, when changing the direction in which the projection lens 8 is directed by making the distance L1 and the distance L2 equal, it is necessary to change the orientation of the projection display device as in the conventional projection display device. Instead, only the direction including the projection lens 8 needs to be changed.

  Accordingly, even if the direction of the projection lens 8 is changed, the direction of the turntable 31 does not change, so that the rotation direction of the turntable 31 does not coincide with the direction of gravity acting on the lamps 32 and 34. Therefore, it is not necessary to increase the torque of the motor 41.

  Further, in the projection display device according to the fourth embodiment, the direction of the handle 80 of the lamp cartridges 33 and 35 does not change even when the direction of the projection lens 8 is changed. The cartridges 33 and 35 can be easily attached and detached.

  In the conventional projection display device, there is one mirror that reflects the light emitted from the lamp. However, in the projection display device according to the fourth embodiment, as shown in FIG. The distance from the optical axis 5 to the base 1 is arbitrarily set regardless of the position of the optical axis 5 by providing the reflection mirrors 9 and 10 and adjusting the relative positional relationship with each other. Making it possible.

  In the fourth embodiment, the case where the direction of the projection lens 8 is changed by 90 degrees has been described. However, the change of the direction of the projection lens 8 is not limited to this.

  In addition, the lamp cartridges 33 and 35 in the first to fourth embodiments are shown as box-shaped, but the shape of the lamp cartridges 33 and 35 is not limited to this, and the opening angle θ of the reflector 58 is not limited thereto. If it has the site | part formed by having substantially the same angle between the optical axes 55 and 56 of the lamp | ramp 32 and 34, shapes, such as a cone shape and a polygonal pyramid shape, may be sufficient.

  In addition, the projection display device described in the first to fourth embodiments can be applied to, for example, a DLP projector with a small lamp changer function that can be installed even in a small installation space. The lamp cartridges 33 and 35 described in the above can be used as replacement lamp cartridges. The DLP is an abbreviation for Digital Light Processing and is a trademark of Texas Instruments Incorporated (TI).

It is a top view of the projection type display apparatus in Embodiment 1 of this invention. It is principal part sectional drawing of the projection type display apparatus in the AA cross section of FIG. It is a figure which shows arrangement | positioning of the lamp cartridge which can be set | placed on the turntable which comprises the light source part of the projection type display apparatus in Embodiment 1 of this invention. It is a figure for demonstrating the packing state of the lamp cartridge in Embodiment 1 of this invention. It is principal part sectional drawing of the projection type display apparatus in the EE cross section in FIG. FIG. 6 is a side view of the lamp cartridge viewed from the Y-axis direction in FIG. 5. It is principal part sectional drawing of the projection type display apparatus in CC cross section in FIG. It is principal part sectional drawing of the projection type display apparatus in the BB cross section in FIG. FIG. 3 is an explanatory diagram for explaining an air path of the projection display device in the first embodiment. It is a top view of the projection type display apparatus in Embodiment 2 of this invention. It is a figure for demonstrating the turntable 31 of the projection type display apparatus in Embodiment 3 of this invention. It is a figure for demonstrating an example of direction of the projection lens in Embodiment 4 of this invention. It is a figure for demonstrating an example of direction of the projection lens in Embodiment 4 of this invention. It is explanatory drawing for demonstrating the relationship between the distances L1 and L2 in Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Projection type display apparatus main body 4 Optical system 4a Ultraviolet reflection filter 4b Lens barrel 4c Lens 5 Optical axis 5a of optical system Central axis 6 of optical path of ultraviolet rays Prism 7 Light valve 8 Projection lens 9, 10 Reflection mirror 12 Conventional Lamp cartridge 30 Changer base 31 Turntable 32 First lamp 33 First lamp cartridge 34 Second lamp 35 Second lamp cartridge 36 Cam groove 37 Rotating plate 37a Air passage 38 Pin 39 Gear portion 40 Reduction gear 41 Stepping motor 42 Pinion gear 43 Reflecting cylinder 44 Incident hole 45 Luminance sensor 46a Control circuit 46b First power circuit 46c Second power circuit 47 Memory 48a First contact portion 48b Second contact portion 49, 90 Rotating shaft 50 Center Shaft 50a first switch 50b second switch 52 second power supply connector 53 First side wall 54 Second side wall 55 First lamp optical axis 56 Second lamp optical axis 57 Burner 58 Reflector 59 Gypsum 60 Lamp mounting portion 60a First power cable 60b Second power cable 61 Positive Electrode 62a Electrode holding part 62b Electrode holding part tip 63 Negative electrode 64 Straight line 67 in contact with the outer shape curve of the electrode cable 65a, 65b, 65c and passing through the electrode holding part tip First recess 68 Second recess 69 First power source Connector 70 Notch 71 Circuit board 72a First board cable 72b Second board cable 73 First board connector 74 Shield case 75 Second board connector 76 First opening 79 Second opening Part 78 Centrifugal blower 78b Exhaust flow 80 Handle 81, 84 Cushion 82, 85 Individual packaging 83, 86 Packing box 87 1st Base mounting surface 88 second base mounting surface 89 lamp mounting table 90 housing 91 third side wall 92 the fourth side wall 93 first notch side wall 94 second notch side wall

Claims (2)

A lamp including a reflector, which is formed to surround the lamp around the optical axis of the lamp, and has an angle substantially the same as the angle formed by the reflecting surface of the reflector with respect to the optical axis. And a housing having a length substantially the same as the entire length of the lamp and including first and second inclined portions provided symmetrically about the optical axis. A plurality of lamp cartridges provided with a connector connected to the power cable in the recess of the second inclined portion;
As with the first inclined portion in the second inclined portion and the other of said lamp cartridge in one of said lamp cartridge is opposite from and close to each other, rotatable turn a plurality of said lamp cartridge is disposed A light source unit having a table;
A projection type display apparatus, wherein a plurality of the lamp cartridges are individually removable from the turntable. The housing of the lamp cartridge includes an opening;
The projection display device according to claim 1 , further comprising a centrifugal blower that blows air to the lamp through the opening of the lamp cartridge.

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