JP3653394B2 - Projection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection apparatus that irradiates an image such as a liquid crystal panel with strong light.
[0002]
[Prior art]
Conventionally, there has been proposed a projection apparatus that irradiates three liquid crystal panels corresponding to R, G, and B, which are the three primary colors of light, with strong light, then combines the light and displays an image on a screen. FIG. 5 is a plan view of the projection apparatus. In the cabinet (6), a chassis (3) for holding three liquid crystal panels (7), (7a) and (7b) is provided, and a projection lens (67) is provided at the front end of the chassis (3). ing.
In the chassis (3), a prism body (30) is provided coaxially with the optical axis of the projection lens (67), and the liquid crystal panel (7a) corresponding to R and B is sandwiched between the prism bodies (30). (7b) is deployed. The prism body (30) includes reflection layers (31) and (32) substantially orthogonal to each other, and a liquid crystal panel corresponding to G is disposed on the opposite side of the projection lens (67) with the prism body (30) interposed therebetween. (7) is provided.
A light source (2) is arranged at the entrance of the chassis (3), and total reflection mirrors (75) (76) (77) (78) and dichroic mirrors (45) (46) are inclined to the optical path on the optical path. Has been deployed. In the following description, the direction in which light is emitted from the light source (2) is assumed to be the front.
[0003]
The light from the light source (2) is reflected by the total reflection mirror (75) after the ultraviolet rays are removed by the UV filter (33). The dichroic mirror (45) allows the passage of R 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). After being reflected by the total reflection mirrors 77 and 78, B is reflected by the reflection layer 31 in the prism body 30 and enters the projection lens 67. The three color lights of R, G and B are synthesized by the prism body (30) and projected onto the screen (68).
[0004]
Since the light source (2) irradiates with strong light, it easily overheats. Further, when the light source (2) has expired, the light source (2) is replaced. However, it is necessary to improve workability at the time of replacement. Therefore, the light source (2) is housed in the frame (1) so that the frame (1) and the light source (2) can be pulled out from the chassis (3) at the same time, together with the frame (1) side. On the other hand, an exhaust fan (5) is provided to cool the light source (2) with air.
FIG. 6 is an exploded perspective view of the light source (2), the frame (1), and the fan (5). The light source (2) is configured by providing a reflector (25) on the back surface of the light emitter (20), and the light emitter (20) is supported by a support piece (26) located behind the reflector (25) at the base end. Is done. A notch (27) is provided at the front end of the support piece (26), allowing air to flow between the outside of the light source (2) and the inside of the reflector (25). A plurality of notches (28) and (28) are provided around the reflector (25), and air outside the light source (2) also enters the reflector (25) from the notches (28).
The frame (1) is open at the front and both sides, and the fan (5) sucks air that has passed through the side opening of the frame (1). A notch (95) is opened on the top surface of the frame (1), and the notch (95) overlaps with the notch (28) on the reflector (25) and enters the reflector (25). Allow inflow of air.
FIG. 7 is a partially cutaway side view of the state in which the light source (2) is housed in the frame (1). An air supply fan (50) is connected to the notch (95) of the frame (1), and most of the air from the outside of the apparatus flows into the reflector (25), and the remainder is the reflector (25). ) Along the outer surface.
[0005]
[Problems to be solved by the invention]
When such a light source (2) is used, for example, at the end of its lifetime, the luminous body (20) may explode. In this case, fragments of the light emitter (20) may damage the optical component. However, since the optical component is attached to the chassis (3), the replacement of the optical component takes time and effort from the viewpoint of maintaining the attachment accuracy.
Also, the explosive sound of the luminous body (20) is very loud, and if the explosion sound is transmitted through the frame (1) and leaks to the outside from the supply fan (50) or the exhaust fan (5). Surprise the user.
An object of the present invention is to prevent damage to optical components in the chassis (3) when the luminous body (20) is exploded, and to mitigate the explosion sound of the luminous body (20) leaking outside.
[0006]
[Means for solving the problems]
Means for solving the above problems include a light source device in the chassis, a spectroscopic means for splitting light from the light source device into R, G, and B, a light valve corresponding to each light of R, G, and B, In a projection apparatus including a synthesis unit that synthesizes light irradiated by a light valve and a projection lens that projects the synthesized light, the light source device includes: a light emitter having shafts on both sides of a light emitting unit; A shaft body located on the base end side is fixed via a support piece, and a light source comprising a shaft body located on the distal end side of the light emitter and a concave reflector for housing the light emitter, and detachably attached to the chassis And a flow path for communicating the air supply means and the light source, and a flow path for communicating the light source and the exhaust means are formed in the frame. And a flow path for communicating the air supply means and the light source. The flow path for communicating the light source and the exhaust means has a function of blocking a smooth passage of sound emitted from the light source by being partitioned into a plurality of spaces by a plate material having a plurality of through holes, and has a concave shape of the reflector. The open portion of the tip is closed by a transparent member, and a pair of notches communicating with the air supply means and the exhaust means are formed at opposite positions on the concave tip of the reflector, and the support piece Is formed with a notch communicating with the air supply means through a gap between the reflector and the shaft located on the base end side of the light emitter, and the pair of notches on the reflector causes the tip of the light emitter to A flow path for cooling the shaft body positioned is formed, and the shaft body and the light emitting section located on the base end side of the light emitter are cooled by the notch of the support piece and the notch on one side of the reflector. The road is formed And wherein the door.
[0007]
[Action and effect]
Since the front surface of the frame (1) is covered with a transparent member and sealed, the light emitted from the light source (2) is not obstructed, and fragments scattered during the explosion of the light emitter (20) (1) will not jump out. Thereby, there is no possibility that the optical components in the chassis (3) are damaged by the fragments of the light emitter (20), and the light source (2) can be replaced by pulling out the frame (1). Further, even if the luminous body (20) explodes, the explosion sound does not leak outside the frame (1) unless it passes through the through holes (18) provided in the plate in the frame (1). That is, since the explosion sound is blocked by the through hole (18) from smoothly propagating through the frame (1), the sound leaking to the outside of the frame (1) is reduced, and the user is not surprised.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of the present invention will be described in detail with reference to the drawings. About the same structure as the past, the same code | symbol is used and detailed description is abbreviate | omitted. This example is characterized by a light source device having a light source (2) and a frame (1). The arrangement of other optical components such as a dichroic mirror (45) in the projection device, and the frame (1) is a chassis. The point that (3) is detachably provided is the same as the conventional one.
FIG. 1 is a perspective view of the frame body (1), FIG. 2 is a front view thereof, and FIG. 3 is a side view of the light source (2) housed in a state where FIG. .
The periphery of the frame (1) is covered and the front surface is open (15). A transparent UV filter (33) is fitted into the front opening (15), and the frame (1) is sealed (see FIG. 3). The frame (1) is divided into three stages of an upper chamber (11), a middle chamber (10), and a lower chamber (12), and the light source (2) is stored in the middle chamber (10). As described above, when the light source (2) is used near the end of its life, for example, the light emitter (20) may explode. However, since the frame (1) is hermetically sealed, it is possible to prevent the fragments of the light emitter (20) from being scattered outside the frame (1).
[0009]
On the side wall of the middle chamber (10), a pair of fasteners (55) (55) provided with notches (56) extending vertically are arranged, and light sources (2) are provided at the upper and lower ends of the notches (56). ) Reflector (25). In FIG. 1, illustration of one fastener (55) is abbreviate | omitted for convenience of explanation.
On the bottom end of the upper chamber (11) and the front end of the bottom of the middle chamber (10), indented notches (17) (19) are established, and as will be described later, the notches (17) (19 ) Allows the cooling air of the light source (2) to pass through.
Even in this example, the light source (2) is cooled, but the flow path of the cooling air is different from the conventional one, and the proximal end portion and the distal end portion of the light emitter (20) are cooled. Moreover, the air in the frame (1) passes through the light source (2) through a plurality of spaces partitioned by a plate material. First, the structure of the light emitter (20) will be described.
[0010]
(Structure of light emitter)
FIG. 8 is a cross-sectional view of the light emitter (20) of the light source (2). The luminous body (20) has transparent shaft bodies (22) and (23) protruding from both sides of the hollow light emitting section (21), and an electrode called a foil (24) is provided in each shaft body (22) and (23). Provided. One shaft body (22) is supported by the support piece (26). The foil (24) faces the end of the light emitting part (21) with a slight gap, and if a discharge occurs between the foils (24) and (24), the light emitting part (21) emits light. . Here, the light emitting section (21) is suitable for use at about 800 to 900 degrees, but the shaft bodies (22) and (23) are suitable for use at about 200 to 300 degrees lower than that. . One reason for this is that if the shafts (22) and (23) are heated too much, the foil (24) may be oxidized and corroded.
Therefore, it is necessary for the light emitter (20) to cool the shaft bodies (22) and (23) at both ends as compared to the light emitter (21).
[0011]
(Cooling air flow path)
2 and FIG. 3, an air supply fan (50) is attached to another part outside the inner part of the frame (1) shown in FIGS. 2 and 3, and air from the fan (50) is sent to the frame (1). It flows into the air supply chamber (13) located inside the frame (1) through the established transparent window (14). 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 surface and the bottom surface of the air supply chamber (13). A large number of through holes (18a) are formed in the bottom surface of the upper chamber (11), and the air in the upper chamber (11) passes through the through holes (18a) and the notches (17), and the middle chamber (10 ).
[0012]
The air in the middle chamber (10) flows to the lower chamber (12) through the notch (19) on the bottom surface. As shown in FIG. 3, the lower chamber (12) is located between the exhaust chamber (8) having a long hole (16) in the side surface, and the bottom surface of the middle chamber (10) and the exhaust chamber (8). It is divided into two rooms, the connecting room (80). The connecting chamber (80) extends obliquely upward from the first horizontal chamber (81) facing the lower end of the reflector (25) of the light source (2) and the rear end of the first horizontal chamber (81). An inclined chamber (83) and a second horizontal chamber (82) extending from the upper end of the inclined chamber (83) to the back. A through-hole (18b) is formed in the bottom surface of the second horizontal chamber (82), and air flowing into the connecting chamber (80) from the middle chamber (10) passes through the through-hole (18b) to the exhaust chamber ( Exhaust 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 of the lower chamber (12), forcing the air in the lower chamber (12) through the long hole (16). To discharge.
[0013]
The cooling air supplied from the through window (14) of the frame (1) by the air supply fan (50) shown in FIG. 2 once flows into the air supply chamber (13) of FIG. The part flows through the through holes (18) and (18a) to the upper chamber (11). The air in the upper chamber (11) flows downward from the upper end of the reflector (25) through the notch (17). The air cools the shaft (23) located at the tip of the light emitter (20). The air that has touched the shaft body (23) is sucked into the connecting chamber (80) by the exhaust fan (5) through the notch (28) of the reflector (25). By this flow, the shaft body (23) located at the tip of the light emitter (20) is cooled.
Part of the air from the air supply chamber (13) enters the middle chamber (10). The air that has flowed into the middle chamber (10) flows from the notch (27) of the support piece (26) of the light source (2) to the inside of the reflector (25). The air is sucked into the connecting chamber (80) through the notch (28) of the reflector (25) after cooling the shaft (22) positioned at the base end of the light emitter (20). 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 notched in the support piece (26). It will not leak out of the light source (2) through (27). Therefore, since the air that has touched the light emitting section (21) does not touch the shaft body (22) positioned at the base end of the light emitting body (20), the shaft body (22) is reliably cooled.
Air sucked into the connecting chamber (80) through the notch (27) of the support piece (26) also cools the light emitting section (21). However, if the light emitting body (20) continues to emit light, the light emitting section (21) may reach a temperature exceeding 1000 degrees, so the light emitting section (21) is cooled to an appropriate use temperature of about It is preferable to set to 800 to 900 degrees.
[0014]
In this example, when the air from the outside of the frame (1) flows into the middle chamber (10) and when the air from the middle chamber (10) flows to the exhaust chamber (8), the through hole (18) Follow the long flow path through (18a) (18b) and the transparent window (14) for the following reason.
As described above, the explosive sound of the luminous body (20) is very large, and the explosive sound is transmitted through the frame (1) to the outside from the supply fan (50) or the exhaust fan (5). If it leaks, it will surprise the user.
Therefore, by increasing the flow path length from the outside of the frame (1) to the light source (2) and allowing air to pass through the through holes (18) and (18a) in the frame (1), Explosive sound is reduced due to the silencer effect. The connection chamber (80) is formed long for the same reason.
Here, the silencer effect means that the level of the sound spreading concentrically from the generation source (9) is reduced as shown in FIG. When a plate member (90) having a through hole (18) is installed in the vicinity of the generation source (9), a part of the sound is blocked by the plate member (90), and a through hole (outside the plate member (90) ( Sound is transmitted only after passing 18). If a plurality of plate members (90) are provided along the sound propagation direction, the sound can be blocked more effectively. The frame (1) according to this example is provided with a plate material having a large number of through holes (18) on the flow path of the cooling air, and effectively blocks the explosion sound of the light source (2).
[0015]
The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and 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 of FIG. 1;
FIG. 3 is a side view in which FIG. 1 is viewed from the left side.
FIG. 4 is an explanatory diagram showing a silencer effect.
FIG. 5 is a plan view of the projection apparatus.
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 cut away.
FIG. 8 is a cross-sectional view of a light emitter.
[Explanation of symbols]
(2) Light source
(3) Chassis
(18) Through hole
(20) Light emitter
(33) UV filter

Claims (1)

A light source device in the chassis, a spectroscopic means for splitting light from the light source device into R, G, and B, a light valve corresponding to each light of R, G, and B, and a composition that combines the light irradiated by the light valve The light source device includes: a light emitter having shaft bodies on both sides of the light emitting section ; and a shaft body positioned on the base end side of the light emitter. A light source comprising a shaft that is fixed via a support piece and located on the distal end side of the light emitter and a concave reflector that houses the light emitter, and a frame that is detachably attached to the chassis and that houses the light source In the frame body, a flow path for communicating the air supply means and the light source is formed, and a flow path for communicating the light source and the exhaust means is formed, and the air supply means and the light source are communicated with each other. The flow path and the light source communicated with the exhaust means Has a function of blocking the smooth passage of sound emitted from the light source by being partitioned into a plurality of spaces by a plate material having a plurality of through holes, and the opening of the concave tip of the reflector is blocked by a transparent member In addition, a pair of notches communicating with the air supply means and the exhaust means are formed at opposite positions at the concave tip portion of the reflector, and the base end of the reflector and the light emitter is formed on the support piece. A notch communicating with the air supply means is formed through a gap with the shaft body located on the side of the light source, and a flow path for cooling the shaft body located on the tip side of the light emitter is formed by the pair of notches of the reflector. The shaft body located on the base end side of the light emitter and the flow path for cooling the light emitter are formed by the cutout of the support piece and the cutout on one side of the reflector. Projection device.

Images