JP2000036215A - Light source device and projector using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the service life of a light source by cooling down a shaft of a light emitter to an appropriate temperature. SOLUTION: A projector is provided with a light source 2 having a light emitter 20 and a frame 1 for housing the light source 2 in a chassis 3. Shafts 22 and 23 to be used at a lower temperature in comparison with a light emitting portion 21 are protrudly formed from both sides of the light emitting portion 21 to be used at a high temperature in the light emitter 20, and the one shaft 22 is supported by a support piece 26. The frame 1 is sealed by covering a front of the frame 1 with transparent material. Air charging means for supplying cool air is provided behind the light source 2. Air in the light source 2 is divided, and flows in a first passage for forcibly discharging the air outside the light source 2 after touching on the other shaft 23 arranged in front of the light emitting portion 21, or flows from a back surface of the light source 2 and is forcibly discharged to the outside of the light source 2 after touching on the one shaft 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection device for projecting an image on a liquid crystal panel or the like by irradiating it with strong light, and a light source device used therefor.

[0002]

2. Description of the Related Art Conventionally, three primary colors of light, R, G, B
After irradiating three liquid crystal panels corresponding to
There has been proposed a projection device that combines light and projects an image on a screen. FIG. 5 is a plan view of the projection device. In the cabinet (6), three liquid crystal panels (7) (7a) (7
b) holding a chassis (3), said chassis (3)
Is provided with a projection lens (67) at the front end. Chassis
In (3), a prism body (30) is provided coaxially with the optical axis of the projection lens (67), and R and B are sandwiched between the prism bodies (30).
The liquid crystal panels (7a) and (7b) corresponding to are provided. The prism body (30) includes therein reflection layers (31) and (32) substantially orthogonal to each other, and a liquid crystal panel corresponding to G is provided on the opposite side of the projection lens (67) across the prism body (30). (7) is provided. A light source (2) is provided at the entrance of the chassis (3), and a total reflection mirror (75) (76) (77) (78) and a dichroic mirror (45) (46) are inclined on the optical path on the optical path. Has been deployed. In the following description, light is emitted from the light source (2) and the prism body (30)
The direction toward is defined as the front.

The light from the light source (2) is reflected by a total reflection mirror (75) after ultraviolet rays are removed by a UV filter (33). The dichroic mirror 45 allows R to pass through and reflects G and B. R is reflected by the total reflection mirror (76), passes through the polarizing plate (73), and irradiates the liquid crystal panel (7a) corresponding to R. G is reflected by the dichroic mirror (46) and enters the prism body (30). B is reflected by the reflection layer (31) in the prism body (30) after being reflected by the total reflection mirrors (77) and (78), and enters the projection lens (67). The R, G, and B three-color lights are combined by the prism body (30) and are projected on the screen (68).

Since the light source (2) irradiates with strong light, it tends to overheat. When the life of the light source (2) has expired,
(2) is replaced, but it is necessary to improve the workability at the time of replacement. Then, the light source (2) is stored in the frame (1),
(1) and the light source (2) can be collectively pulled out from the chassis (3), and an exhaust fan is provided beside the frame (1).
(5) is provided to cool the light source (2) by air. Figure 6 shows the light source
FIG. 2 is an exploded perspective view of a frame (1) and a fan (5). light source
(2) is configured by providing a reflector (25) on the back surface of the luminous body (20), and the luminous body (20) has a base end supported by a support piece (26) located behind the reflector (25). You. A notch (27) is provided at the front end of the support piece (26) to allow air to flow between the outside of the light source (2) and the inside of the reflector (25). Reflector
A plurality of notches (28) are provided around (25),
The outside air of (2) is also reflected from the notch (28) by the reflector (2).
5) Go inside. The frame (1) is open at the front and both sides, and the fan (5) sucks air passing through the side opening of the frame (1). A notch (95) is formed on the top surface of the frame body (1), and the notch (95) overlaps the notch (28) on the reflector (25) top surface to allow air to flow into the reflector (25). Part flows in and the rest flows along the outer surface of the reflector (25). FIG. 7 shows a frame (1).
FIG. 6 is a side view in which a state in which the light source (2) is housed is partially broken. An air supply fan (50) is connected to the notch (95) of the frame (1), and most of the air from outside the device flows into the reflector (25).

[0005]

The light source (20) of the light source (2)
As shown in FIG. 8, symmetrically transparent shafts (22) and (23) project outward from both sides of the hollow light emitting portion (21), and each shaft (2
2) An electrode called a foil (24) is provided in (23). One shaft body (22) is supported by the support piece (26). The foil (24) is
In 1), the ends face each other with a slight gap, and both foils (24) (24)
In the meantime, a discharge is generated, and the light emitting section (21) emits light. The light emitting part (21) is suitably used at about 800 to 900 degrees, but the shaft bodies (22) and (23) are lower at about 200 to 30 degrees.
Use at 0 degrees is appropriate. One of the reasons is that if the shafts (22) and (23) are excessively heated, oxidation of the foil (24) proceeds and there is a possibility of corrosion. Therefore, the luminous body (20) needs to cool the shaft bodies (22) and (23) on both sides to keep the luminous body at a lower temperature than the luminous part (21). However, in the conventional light source (2), after the air flowing into the reflector (25) touches the light emitting part (21), it passes through the notch (27) of the support piece (26) and passes through the light source ( There is a possibility that it may flow out of 2). In this case, the air heated by the light emitting section (21) touches the shaft body (22), and instead heats the shaft body (22), which causes a reduction in the life of the light emitting body (20). Further, when such a light source (2) is used, for example, near the end of its life, the light source (2)
0) may explode. At this time, fragments of the luminous body (20) may damage the optical component, but the optical component is
Since it is mounted in (3), replacing the optical parts requires a lot of trouble to maintain the mounting accuracy. Accordingly, the applicant has covered the front opening of the frame (1) with a transparent member, specifically, a UV filter (33), and when the luminous body (20) exploded carelessly, the inside of the chassis (3) was removed. Optical components were prevented from being damaged. In connection with this, it was conceived to change the flow of air in contact with the luminous body (20), cool the shaft bodies (22) and (23) first, and make the light source (2) last longer. It is an object of the present invention to cool a shaft of a light emitting body to an appropriate temperature and make a light source last longer.

[0006]

The frame (1) of the light source device is sealed with its front face covered with a transparent member, and the air supply means is connected to the light source (2).
The light source (2) is provided with a cooling air inlet at the front and rear sides thereof, and an exhaust port is provided at the front of the light source (2). The cooling air from the air supply means is branched and
In (1), one air flows in from a front inlet of the light source (2) and touches one front shaft body (23) located closer to the front than the light emitting part (21), The first flow path which is forcibly discharged from the exhaust port and the other air flow from the rear inlet of the light source (2), first touch the other rear shaft body (22), and then forcibly from the exhaust port. And a second flow path that is selectively discharged.

[0007]

[Operation and Effect] The air following the first flow path is emitted by the light emitting portion (21).
After touching one of the shafts (23) located closer to the front than the light source (2), it is forcibly discharged to the outside of the light source (2). The air following the second flow path flows in from the back of the light source (2), and the other shaft (22)
, And is forcibly discharged to the outside of the light source (2). That is, the cooling air flowing into the light source (2)
(22) Since it comes into contact with (23), both shafts (22) and (23) are reliably cooled. Thereby, the life of the luminous body (20) can be extended.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of the present invention will be described in detail with reference to the drawings. The same components as those of the related art are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, the light source (2) and the frame
The light source device having (1) is characterized by the arrangement of other optical components such as a dichroic mirror (45) in the projection device, and the point that the frame (1) is detachably mounted on the chassis (3). Is the same as before. FIG. 1 is a perspective view of the frame (1), FIG. 2 is a front view thereof, and FIG. 3 is a side view of the frame (1) cut away from the left side of FIG. 1 and containing a light source (2) therein. . Frame (1)
Has an opening (15) on the front and its periphery is covered. The front opening
A transparent UV filter (33) is fitted in (15), and the frame (1) is sealed (see FIG. 3). The frame (1) is divided into three stages: an upper room (11), a middle room (10), and a lower room (12).
The light source (2) shown in FIG. As mentioned above, the light source
If (2) is used, for example, near the end of its life, the luminous body (20) may explode. However, since the frame (1) is sealed, it is possible to prevent fragments of the luminous body (20) from scattering outside the frame (1).

A pair of fasteners (55) and (55) each having a notch (56) extending vertically are provided on the side wall of the middle chamber (10).
The reflector (25) of the light source (2) is held between the upper and lower ends of the notch (56). In FIG. 1, illustration of one of the fasteners (55) is omitted for convenience of explanation. At the front ends of the bottom of the upper chamber (11) and the bottom of the middle chamber (10), notches (17) and (19) that are concave inward are opened, and as described later, the notches (17) and (19) ) Allows the passage of the cooling air of the light source (2). Even in this example, it is necessary to cool the light source (2), but the flow path of the cooling air is different from the conventional one, and the base end and the front end of the luminous body (20) are cooled. In addition, frame (1)
The air inside passes through the inside of the light source (2) through a plurality of spaces partitioned by plate materials. The flow path will be described below.

(Cooling air flow path) Frame shown in FIGS. 2 and 3
An air supply fan (50) is provided on another part outside the back of (1), and air from the fan (50) is supplied through a transparent window (14) formed on the side surface of the frame (1). ), And flows into an air supply chamber (13) provided in the inner back portion of the frame (1). Air from the air supply chamber (13) flows into the upper chamber (11) and the middle chamber (10) through the through holes (18) formed in the side and bottom surfaces of the air supply chamber (13). Upper room (1
At the bottom of (1), a number of through holes (18a) are opened, and the upper chamber (1
The air of 1) passes through the through hole (18a) and the notch (17),
Flows into the middle room (10).

The air in the middle chamber (10) flows to the lower chamber (12) through the notch (19) in the bottom surface. As shown in FIG. 3, the lower chamber (12) is located between the exhaust chamber (8) having a long hole (16) on the side and the bottom of the middle chamber (10) and the exhaust chamber (8). Connecting room (80)
It is divided into two rooms. The connecting chamber (80) includes a first horizontal chamber (81) facing the lower end of the reflector (25) of the light source (2),
An inclined chamber (83) extending obliquely upward from the rear end of the first horizontal chamber (81), and a second inclined chamber (83) extending from the upper end of the inclined chamber (83).
A horizontal chamber (82) is provided. A through hole (18b) is formed in the bottom surface of the second horizontal chamber (82), and the air flowing into the connecting chamber (80) from the middle chamber (10) passes through the through hole (18b) to the exhaust chamber ( Exhausted from 8). The reason why the connecting chamber (80) is formed so long will be described later. As shown in FIG. 2, an exhaust fan (5) is attached to another part on the side surface of the lower chamber (12), and a long hole (1) is provided.
The air in the lower chamber (12) is forcibly discharged through 6).

The cooling air from the air supply fan (50) shown in FIG. 2 once flows into the air supply chamber (13) through the transparent window (14).
A part flows into the upper chamber (11) through the through holes (18) (18a).
The air in the upper chamber (11) flows downward from the upper end of the reflector (25) through the notch (17). The air is a luminous body
The shaft (23) located at the tip of (20) is cooled. Shaft (23)
Is touched by the exhaust fan (5), and is drawn into the connection chamber (80) through the notch (28) of the reflector (25). By this flow, the shaft body (23) located at the tip of the light emitting body (20) is cooled. Some of the air from the air supply chamber (13)
Enter the middle room (10). The air flowing into the middle room (10) is
It flows into the inside of the reflector (25) from the notch (27) of the support piece (26) of (2). This air cools the shaft body (22) located at the base end of the luminous body (20), and then cuts out the notch (2) of the reflector (25).
Through 8), it is sucked into the connecting room (80). Since the air in the middle chamber (10) is forcibly sucked into the connecting chamber (80) by the exhaust fan (5), the air inside the reflector (25) is cut off by the notch of the support piece (26). It does not leak out of (27) and leak out of the light source (2). Accordingly, since the air that has touched the light emitting portion (21) does not touch the shaft (22) located at the base end of the light emitting body (20), the shaft (22) is reliably cooled.

In this embodiment, since the cooling air flowing into the luminous body (20) first contacts the shafts (22) and (23), the cooling air (2)
2) (23) is reliably cooled. Thereby, the luminous body (20) can be used for a long time. The air sucked into the connecting chamber (80) through the notch (27) of the support piece (26) also cools the light emitting part (21). However, if the luminous body (20) continues to emit light, the luminous part (21) may reach a temperature exceeding 1000 degrees.
It is preferable to set to 0 to 900 degrees.

In this embodiment, when air from outside the frame (1) flows into the middle chamber (10) and when air from the middle chamber (10) flows to the exhaust chamber (8), A long flow path is traced through the through holes (18), (18a), (18b) and the transparent window (14) for the following reason. As described above, when the light source (2) is used near the end of its life, the luminous body (20) may explode. The explosion sound generated at this time is very loud. If the explosion sound leaks from the air supply fan (50) or the exhaust fan (5) through the frame (1), the user is Surprise. Therefore, the frame (1)
By increasing the length of the flow path from the outside to the light source (2) and passing air through the through holes (18) (18a) in the frame (1), the explosion sound is reduced by the effect of silencer ing. The connection chamber (80) is formed long for the same reason.
Here, the silencer-like effect means that the level of the sound concentrically spreading from the source (9) is reduced as shown in FIG. When a plate (90) having a through-hole (18) is installed near the source (9), part of the sound is blocked by the plate (90), and the outside of the plate (90) has a through-hole (90). The sound can only be transmitted as long as it passes 18). If a plurality of plate members (90) are provided along the sound propagation direction, sound can be more effectively blocked. The frame body (1) according to the present embodiment is provided with a plate material having a large number of through holes (18) on a flow path of cooling air, and effectively shuts off the explosion sound of the light source (2).

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a perspective view of a frame.

FIG. 2 is a front view in which a wall surface of FIG. 1 is cut away.

FIG. 3 is a side view showing a longitudinal section of FIG. 1 as viewed from the left side.

FIG. 4 is an explanatory diagram showing the principle of a silencer effect.

FIG. 5 is a plan view of the projection device.

FIG. 6 is an exploded perspective view of a conventional light source, frame, and fan.

FIG. 7 is a side view showing a conventional light source and a frame body cut away.

FIG. 8 is a sectional view of a light emitting body.

[Explanation of symbols]

 (2) Light source (3) Chassis (20) Light emitter (21) Light emitter (22) Shaft (23) Shaft (33) UV filter

Claims (3)

[Claims] 1. A light source (2) and a frame housing the light source (2)
(1), the frame (1) is detachably provided on the chassis (3), and the frame (1) is provided with a cooling air supply means for the light source (2) and a light source (2). Exhaust means, and a light source
(2) includes a luminous body (20) and a support piece (26) located behind the luminous body (20) and supporting the luminous body (20), and the luminous body (20) is used at a high temperature. From the front and rear of the light emitting section (21)
(21) In the light source device in which the shafts (22) and (23) to be used at a lower temperature than the (21) are protruded and one of the shafts (22) is supported by the support pieces (26), In (1), the front face is covered and sealed with a transparent member, and the air supply means is arranged behind the light source (2). Cooling air inlets are opened on the front and rear sides of the light source (2), respectively. Then, an exhaust port is opened in front of the light source (2), cooling air from the air supply means is branched, and one of the air flows into the frame (1) from an inlet in front of the light source (2). Inflow,
One front shaft body (23) located closer to the front than the light emitting section (21)
Then, the first flow path forcibly discharged from the exhaust port and the other air flow from the rear inlet of the light source (2), and first touch the other rear shaft body (22). And a second flow path forcibly discharged from the exhaust port. 2. The light source device according to claim 1, wherein the transparent member that covers the front surface of the frame body is a UV filter that blocks ultraviolet rays. 3. A light source (2) and a light source in a chassis (3).
A spectroscopic means for dispersing the light from (2) into R, G, and B;
Light valves (7), (7a), and (7b) corresponding to each light of G and B
A light source (2) attached to and detached from a chassis (3). It is housed in a frame (1) that is freely disposed, and the frame (1) is provided with a cooling air supply unit for the light source (2) and an exhaust unit from the light source (2). 2) includes a luminous body (20) and a support piece (26) positioned behind the luminous body (20) and supporting the luminous body (20), and the luminous body (20) is used at a high temperature. From the front and rear of the light emitting part (21), a shaft body (22) to be used at a lower temperature than the light emitting part (21)
(23) is projected, and one shaft body (22) is supported by a support piece (26).
In the projection device supported by the frame, the frame (1) is sealed by covering the front surface with a transparent member, and the air supply means is arranged behind the light source (2). The cooling air inlet is opened on each side, the exhaust outlet is opened on the front side of the light source (2), the cooling air from the air supply means is branched, and one side is inserted into the frame (1). Air flows in from the front inlet of the light source (2),
One front shaft body (23) located closer to the front than the light emitting section (21)
Then, the first flow path forcibly discharged from the exhaust port and the other air flow from the rear inlet of the light source (2), and first touch the other rear shaft body (22). And a second flow path forcibly discharged from the exhaust port.