JP2003005292A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool a lamp 5 with a small amount of airflow in a projector device to project video light by using a lamp unit 4 as a light source. SOLUTION: In this projector device, the lamp unit 4 is formed by installing the lamp 5 in a housing 41. The lamp 5 is provided with a reflector 51, a light emitting part 50 provided at the focal point of the reflector 51, and a light transmitting plate 53 that covers the front surface opening of the reflector 51. An air inlet 52 for introducing air from the outside of the lamp 5 to the light emitting part 50 and an air outlet 54 for guiding the air introduced from the air inlet 52 to the outside of the lamp 5 are opened in the lamp unit 4. A blower fan 44 is connected to the air inlet 52 through a duct 47, and the forced air cooling of the light emitting part 50 is carried out by operating the blower fan 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device, such as a liquid crystal projector, which projects image light onto a screen by using a lamp as a light source.

[0002]

2. Description of the Related Art A projector unit of this type is equipped with a lamp unit in which a mercury lamp is arranged in a housing, and an exhaust fan is installed at a position behind the mercury lamp, and the exhaust fan is operated by the exhaust fan. The mercury lamp is cooled by generating an air flow around the mercury lamp.

[0003]

However, in a high-brightness projector device equipped with an ultra-high pressure mercury lamp as a light source, the amount of heat generated by the mercury lamp is large, and in order to perform sufficient cooling, the exhaust fan is rotated at a high speed. Therefore, it was necessary to generate a high-speed airflow. As a result,
There was a problem that the noise from the exhaust fan increased. Then, the objective of this invention is providing the projector apparatus which can cool the lamp used as a light source effectively with a small air volume.

[0004]

In the projector apparatus according to the present invention, the lamp unit (4) includes a housing (4
It is configured by installing the lamp (5) in 1), and the lamp (5) is
The reflector (51) includes a light emitting part (50) provided at or near the focal position of the reflector (51), and a translucent plate (53) covering the front opening of the reflector (51). The lamp unit (4) has an air inlet (5) for introducing air from the outside of the lamp (5) toward the light emitting section (50).
2) and the air introduced from the air inlet (52) to the lamp (5)
An air outlet (54) for opening to the outside of the
Blower fan (44) to air inlet (52) via duct (47)
Are connected.

In the projector apparatus of the present invention, the blower fan (44) is operated to blow air directly onto the light emitting section (50) of the lamp (5), which has the highest temperature.
The light emitting part (50) is forcibly cooled. Further, since the reflecting surface of the reflector (51) that surrounds the light emitting portion (50) is formed into a concave curved surface, an air flow along the concave curved surface, that is, an air flow that surrounds the light emitting portion (50) and swirls occurs. As a result, the heat transfer coefficient on the surface of the light emitting section (50) increases. As a result, effective cooling can be performed with a smaller amount of air than the conventional device that generates an air flow outside the reflector.

In a specific configuration, the air inlet port (52) and the air outlet port (54) are opened near the opening edge of the reflector (51) and are inclined toward the light emitting part (50). There is. As a result, an airflow that flows from the air inlet port (52) to the air outlet port (54) via the periphery of the light emitting unit (50) is generated, and effective air cooling of the light emitting unit (50) is performed.

Further, in a specific structure, the housing (41)
Inside the, at the rear of the lamp (5), the exhaust fan (40)
Is installed. This creates an air flow around the lamp (5), increasing the cooling capacity.

[0008]

According to the projector apparatus of the present invention, since effective cooling can be performed with a smaller air flow than that of the conventional apparatus, it is possible to reduce noise accompanying the operation of the fan.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A liquid crystal projector according to the present invention will be described below.
Embodiments specifically described with reference to the drawings
Itoverall structure The liquid crystal projector according to the present invention, as shown in FIG.
Flat case consisting of half case (11) and upper half case (12)
The casing (1) and the front panel (13) of the casing (1).
The projection window (14) is opened and the lamp unit
An exhaust hole (15) for warm air discharged from the knit has been opened.
It Inside the casing (1), as shown in FIGS.
An optical unit for generating color image light (2)
And a lamp unit (4) that serves as a light source for the optical unit (2)
And a cooling unit for cooling the optical unit (2)
(6) and are deployed.

[0010]Optical unit (2) The optical unit (2) is a lamp unit as shown in FIG.
The white light from (4) is sent to the first integrator (21) and the first
Beam (22), second integrator (23) and polarized beam sp
After passing through the litter (24), lead to the blue two-color separation mirror (25),
This separates the blue light. Also, two-color separation mirror for blue
-Direct the light that passed through (25) to the two-color separation mirror for green (27),
This separates the green light. Two-color separation mirror for blue (2
The blue light separated by 5) goes through the second mirror (26)
It enters the color synthesizer (3). Also, two-color separation mirror for green (2
The green light separated by 7) enters the color synthesizer (3).
Then, the red light enters the color synthesizer (3) through the third mirror (28).
Shoot.

The blue light incident on the color synthesizer (3) is incident on the blue incident side polarization plate (31) of the color synthesizer (3) and the blue liquid crystal panel (3).
2), and the output side polarization plate for blue (33), then the color synthesis prism
Guided by (30). The green light incident on the color synthesizer (3) is incident on the green incident side polarizing plate (34), the green liquid crystal panel (35), and the green emitting side polarizing plate (36). Then, the light is guided to the color synthesis prism (30). Further, the red light incident on the color synthesizing device (3) receives the red incident side polarization plate (3) of the color synthesizing device (3).
7), the liquid crystal panel for red (38), and the emission side polarization plate (39) for red, and is guided to the color synthesis prism (30). Color synthesis prism
The three colors of image light guided to (30) are combined by the color combining prism (30), and the color image light obtained by this is
It is enlarged and projected on the screen in front through the projection lens (20).

[0012]Lamp unit (4) As shown in FIG. 7, the lamp unit (4) has a housing (4
An ultra-high pressure mercury lamp (5) is installed in 1).
An exhaust fan (40) is installed behind (5).
It The ultra-high pressure mercury lamp (5) has a reflector (51) and a reflector.
A light emitting part (50) provided at the focal position of the deflector (51),
A transparent plate (53) that covers the opening of the reflector (51).
The lower end of the translucent plate (53) has a reflector.
-In the width direction of the translucent plate (53) between the opening edge of the (51)
A long and narrow air inlet (52) is opened and the light is transmitted.
At the top edge of the plate (53) is the opening edge of the reflector (51).
And a narrow space that extends in the width direction of the translucent plate (53).
The Qi Outlet (54) is open. In addition, with the air inlet (52)
Each of the air outlets (54) is connected to the light emitting part (50) of the lamp (5).
It has an opening shape that is inclined toward.

As shown in FIG. 6, on the upper wall of the housing (41), one elongated first intake air extending in the front-rear direction is provided at one end in the width direction orthogonal to the optical axis (front-rear direction) of the lamp. Window (45)
And a plurality of elongated second intake windows (46) extending in the front-rear direction are provided at the center in the width direction.
Also, on the upper wall of the housing (41), at the end in the light emitting direction,
One third intake window (49) is opened which extends in the width direction.

A fan case (42) is connected to the housing (41) at a portion facing the air inlet (52) through a duct (47), and the inside of the fan case (42) is , A fan (44) is housed. The blower fan (44) is a duct
A discharge port (48) opening toward the inside of (47) and an intake port (43) opening downward are shown in FIG.
As shown in FIG. 5, it will be connected to a plurality of intake holes (16) formed in the bottom wall of the lower half case (11).

When the liquid crystal projector is powered on, the exhaust fan (40) and the blower fan (44) start rotating. Rotation of the exhaust fan (40) causes the housing to
(41) First intake window (45), second intake window (46) and third intake window
Air is sucked from (49) to generate an air flow around the lamp (5) toward the exhaust fan (40), and the air flow cools the outer peripheral surface of the lamp (5).

Here, the first wall is provided on the upper wall of the housing (41).
Since the left-right asymmetrical opening pattern is given by the intake window (45), the exhaust gas is emitted around the reflector (51) of the lamp (5) while rotating in one direction around the optical axis of the lamp (5). An air flow to the fan (40) will be generated.

For example, as shown in FIG. 8, when the exhaust fan (40) rotates in the clockwise direction, the ceiling wall of the housing (41b) has a first intake window (45) and a first intake window (45) at a position that is biased to the right as a whole. 3 By opening the intake window (49) and providing an asymmetrical opening pattern as a whole, a clockwise airflow surrounding the lamp (5) is generated, and the airflow maintains its rotation. While passing through the exhaust fan (40). As a result, uniform heat transfer is performed on the entire outer peripheral surface of the lamp (5), and the lamp (5) can be sufficiently cooled with a smaller air flow rate.

On the other hand, as shown in FIG.
When a plurality of second intake windows (46) are symmetrically opened on the ceiling wall of (41a), almost no airflow rotating around the lamp (5) is generated, and the outer peripheral surface of the lamp (5) is Airflow that is partially biased is generated. As a result, the heat transfer on the outer peripheral surface of the lamp (5) becomes insufficient, and the temperature distribution becomes uneven.

FIG. 10 (a) shows a housing (41a) in which a plurality of second intake windows (46) are opened in the center of the ceiling wall, and FIG. 10 (b) shows the width of the end of the ceiling wall. 3rd intake window (4
9) shows a housing (41b) in which a first intake window (45) extending back and forth on the side of the ceiling wall is opened, and FIG. 11 (c) shows the first intake window (45) and the second intake window (45). The housing (41c) in which all of the intake window (46) and the third intake window (49) are opened is shown in Table 1.
Shows the result of measuring the temperature distribution on the outer peripheral surface of the lamp for three types of lamp units having these housings (41a) (41b) (41c).

[0020]

[Table 1]

As is clear from the results shown in Table 1, the housings (41b) (41b) having a left-right asymmetric opening pattern as a whole
In c), the maximum temperature is kept lower than that of the housing (41a) having a symmetrical opening pattern, and
The difference between the maximum temperature and the minimum temperature is kept small, which confirms the effect of the housing having an asymmetric opening pattern.

Further, the lamp unit shown in FIG. 6 and FIG.
In (4), as the blower fan (44) rotates, air is sucked from the intake hole (16) of the lower half case (11) through the intake port (43) of the blower fan (44) and discharged. Exit (4
Air is discharged from 8), and the discharged air is duct (47).
Through the air inlet (52) of the lamp (5) to the reflector
It is introduced inside (51). Here, since the air inlet (52) is opened toward the light emitting part (50), the reflector (5
The air introduced inside 1) is directly blown to the light emitting unit (50). Further, the air flow is guided along the concave curved surface of the reflector (51) to generate a swirling flow surrounding the light emitting section (50).

As a result, the air introduced into the inside of the reflector (51) exchanges heat with the light emitting part (50) of the lamp (5) at a high heat transfer coefficient, and the light emitting part (50) is forcibly air-cooled. Then, the air is led out to the outside of the reflector (51) from the air outlet (54). The air led out of the air outlet (54) to the outside of the reflector (51) merges with the airflow flowing around the reflector (51) and flows toward the exhaust fan (40). The airflow that has passed through the exhaust fan (40) is discharged forward through the exhaust holes (15) of the front panel (13) shown in FIG.

As described above, since the light emitting part (50) of the lamp (5), which has the highest temperature, is efficiently cooled, the exhaust fan
It is possible to set the air volume of the fan (40) or the blower fan (44) to a small amount, which can significantly reduce the noise generated from these fans (40) and (44).

Further, in the liquid crystal projector of the present invention, the emission direction of the white light from the lamp unit (4) and the projection direction of the image light from the optical unit (2) are set to 1 to each other.
By adopting an optical system set in the opposite direction that is different by 80 degrees,
Projection window (14) and exhaust hole on front panel (13) of casing (1)
Since it is also provided with (15), the noise generated from the fan built in the lamp unit (4) is emitted toward the screen in the light projection direction. As a result, the noise from the fan is less likely to reach the viewer at the rear position farther from the screen than the liquid crystal projector.

[0026]Cooling unit (6) As shown in FIGS. 3 and 4, the lower position of the optical unit (2)
The cooling unit to cool the optical unit (2).
(6) is placed. The cooling unit (6) is shown in FIG. 11 and
It has a flat housing (60) as shown in Figure 12,
Four air outlets opened on the surface of the housing (60)
The four optical units (2) above (63) (64) (65) (69)
The air is blown toward the heat generating part.

The four air outlets (63) (64) (65) (69)
Of the three, the three air outlets (63), (64), and (65) shown in FIG. 16 are blue incident-side polarization plates that constitute the color synthesizing device (3).
(31), a blue liquid crystal panel (32) and a blue emission side polarizing plate (33), an air outlet for blue, an incident side polarizing plate for green (34), and a liquid crystal panel for green (35). ) And output side polarizing plate for green (36)
An air outlet for green, which is open toward, an incident side polarizing plate (37) for red, a liquid crystal panel (38) for red, and an outgoing side polarizing plate (3) for red.
It is an air outlet for red that opens toward 9).
The remaining one air outlet (69) shown in FIG. 12 serves as an air outlet for a polarization beam splitter (hereinafter referred to as PBS) that opens toward the polarization beam splitter (24) shown in FIG.

The housing (60) of the cooling unit (6) is composed of a main body (61) and a lid body (62) as shown in FIG.
The above-mentioned four air outlets (63) (64) (65) (69) are opened at (62). The housing body (61) has first to third parts.
The three cooling fans (66) (67) (68) are arranged in a line, and the air discharged from these cooling fans (66) (67) (68) is formed by a plurality of partition walls. The flow is divided or merged via the flow path network (8) to form four flows having appropriate flow rates as described later, and four air outlets (63) (64) (65) (6)
Blow out from 9).

That is, of the incident side polarization plate, the liquid crystal panel and the emission side polarization plate for each color which compose the color synthesizing device (3) (hereinafter, these three pieces are collectively referred to as a polarization / liquid crystal part), one for blue Since the amount of heat generated by the polarized light / liquid crystal part is the largest, the airflow discharged from each cooling fan (66) (67) (68) is divided into two, and one of the divided airflows is divided into the green polarization / liquid crystal part. , The polarized light / liquid crystal portion for red and the PBS are cooled, and the other divided air current is allocated to the polarized light / liquid crystal portion for blue.

Therefore, as shown in FIGS. 14 and 15, as a flow path network (8), the flow from the first cooling fan (66) to the blue air outlet (63) and the PBS air outlet (69). Road,
A flow path from the second cooling fan (67) to the blue air outlet (63) and the green air outlet (64), and the third cooling fan (68) for the blue air outlet (63) and red. It forms a flow path to the air outlet (65).

At the air outlet (69) for PBS, there is a guide vane.
(89) is attached, and the airflow from the first cooling fan (66) is blown at high speed to the high temperature portion of the polarization beam splitter (24), that is, the central portion of the light emitting surface. For cooling the blue polarization / liquid crystal part, the green polarization / liquid crystal part, and the red polarization / liquid crystal part, in order to properly adjust the air volume and the wind direction with respect to the entrance side and the exit side, as described later, Form a surface.

That is, as shown in FIG. 13, the first to fourth partition walls (81) (82) (83) (84) are installed at the blue air outlet (63) to install the first cooling fan. From the first air blowout part (91) which should blow out the airflow from (66), the second air blowout part (92) which should blow out the airflow from the second cooling fan (67), and the third cooling fan (68) The third air outlet (9
3) Form and. Further, air flow guide surfaces (not shown) are formed on the first partition wall (81) and the third partition wall (83), respectively.
The wind direction and volume of the airflow from the second cooling fan (67) and the third cooling fan (68) to the entrance side and the exit side of the polarization / liquid crystal portion for blue are adjusted. A guide blade (85) is installed in the air outlet (64) for green, and two air outlets (95) (96) are formed on both sides of the guide blade (85). / Adjusts the wind direction and volume of the air flow to the incident side and the emission side of the liquid crystal part. Furthermore, the red air outlet (65) has a fifth partition wall (86) and guide vanes (87).
Is installed to form two air outlets (97) and (98), and the air flow direction and volume from the third cooling fan (68) to the incident side and the emission side of the red polarization / liquid crystal portion are adjusted. .

FIG. 16 shows the positional relationship between the blue air outlet (63) and the blue polarizing / liquid crystal portion, the positional relationship between the green air outlet (64) and the green polarizing / liquid crystal portion, and the red air. Outlet (65)
Shows the positional relationship between the polarized light for red and the liquid crystal part, and the airflow whose air volume and direction are adjusted as described above is blown to the incident side and the output side of each polarized light / liquid crystal part for effective cooling. Be done.

The first cooling fan (66), the second cooling fan (67) and the third cooling fan (68) shown in FIG. 14 are all single suction type sirocco fans having a suction port on one side of the casing. . The first cooling fan (66) and the second cooling fan (67) are installed in the housing body (61) with their suction ports (66a) (67a) facing upward, and their respective discharge ports ( 66b) and 67b) face the inlet of the channel network (8). The third cooling fan (68) is installed in the housing body (61) with the suction port facing downward, and the discharge port (68b) faces the inlet of the flow path network (8). .

On the rear surface of the housing body (61), as shown in FIG. 14, the first rear surface intake air is provided corresponding to the first cooling fan (66), the second cooling fan (67) and the third cooling fan (68). Window (71),
A second rear intake window (72) and a third rear intake window (73) are opened. Also, on the bottom surface of the housing body (61), as shown in FIG. 18, corresponding to the third cooling fan (68), the lower intake window (7
4) has been opened.

FIG. 17 shows a sectional structure of the cooling unit (6) at the position where the second cooling fan (67) is installed.
The sectional structure at the position where the first cooling fan (66) is installed is similar. In addition, FIG. 18 shows the third of the cooling unit (6).
The cross-sectional structure at the position where the cooling fan (68) is installed is shown. The first cooling fan (66) and the second cooling fan (6
A space S as large as possible is provided between the upper wall of the lid body (62) and the upper wall of the lid body (62), and as shown by an arrow in FIG. 17, a rear surface of the housing body (61). Air sucked from the intake windows (71) (72) flows into the suction ports (66a) (67a) of the first and second cooling fans (66) (67) through the space. or,
Below the third cooling fan (68), a space S as large as possible is provided between the housing main body (61) and the bottom wall of the housing main body (61). As shown by the arrow in FIG. (61)
The air sucked from the rear suction window (73) and the lower suction window (74) is sucked into the suction port (68a) of the third cooling fan (68) through the space.

The three rear intake windows (71), (72) and (73) of the housing body (61) are connected to the intake holes (not shown) formed in the rear surface of the casing (1), and the housing body (61) The lower surface intake window (74) of () is connected to an intake hole (not shown) formed in the bottom wall of the casing (1).

As described above, the suction ports (66a) (67a) (68a) of the cooling fans (66) (67) (68) are all the casing (1).
Since there is no connection between the cooling fan (66), (67) and (68), the wall surface of the housing (60) is connected to the outside of the casing (1) and the inside of the casing (1). ) Only the low temperature air outside is sucked in, and the high temperature air inside the casing (1) is not sucked in. As a result, low-temperature air is blown toward the optical unit (2), and the optical unit (2) can be sufficiently cooled with a small air volume.

Further, each cooling fan (66) of the cooling unit (6)
(67) (68) uses a single suction type sirocco fan, and between the fan side where the suction ports (66a) (67a) (68a) are opened and the housing (60) wall surface, Since the space S is provided, the flow resistance of the air sucked by the fan through the space is low. As a result,
As each cooling fan, a low output sirocco fan with a low rotation speed can be adopted.

According to the above-mentioned liquid crystal projector of the present invention, the cooling system for cooling the lamp (5) and the optical unit (2) is improved, so that effective cooling can be performed with a smaller air flow than in the past. It is possible to operate the fan for feeding the cooling air at a low rotation speed, which can significantly reduce the noise generated from the fan.

[Brief description of drawings]

FIG. 1 is a perspective view of a liquid crystal projector according to the present invention.

FIG. 2 is a diagram showing a configuration of an optical system of a lamp unit and an optical unit equipped in the liquid crystal projector.

FIG. 3 is an exploded perspective view of the liquid crystal projector.

FIG. 4 is a perspective view showing a state in which a lamp unit, an optical unit and a cooling unit are removed from a lower half case of the liquid crystal projector.

FIG. 5 is a perspective view showing a state where a lamp unit, an optical unit and a cooling unit are incorporated in a lower half case of the liquid crystal projector.

FIG. 6 is a plan view of a lamp unit.

FIG. 7 is a sectional view of a lamp unit.

FIG. 8 is a partially cutaway perspective view of a lamp unit having a left-right asymmetric opening pattern.

FIG. 9 is a partially cutaway perspective view of a lamp unit having a symmetrical opening pattern.

FIG. 10 is a plan view of three types of lamp units having different opening patterns.

FIG. 11 is a perspective view of a cooling unit and a color synthesizing device.

FIG. 12 is a perspective view of a cooling unit.

FIG. 13 is a plan view of a cooling unit.

FIG. 14 is an exploded perspective view of a cooling unit.

FIG. 15 is a plan view of a housing body of the cooling unit.

FIG. 16: Three polarizations / cooling unit and optical unit
FIG. 3 is a plan view showing a positional relationship with a liquid crystal section.

FIG. 17 is a cross-sectional view of a second cooling fan of the cooling unit.

FIG. 18 is a sectional view of a third cooling fan of the cooling unit.

[Explanation of symbols]

(1) Casing (11) Lower half case (12) Upper case (13) Front panel (14) Projection window (15) Exhaust hole (2) Optical unit (3) Color synthesizer (4) Lamp unit (40) Exhaust fan (41) Housing (44) Blower fan (45) First intake window (46) Second intake window (47) Duct (5) Lamp (50) Light emitting part (51) Reflector (52) Air inlet (53) Translucent plate (54) Air outlet (6) Cooling unit (60) Housing (63) Blue air outlet (64) Green air outlet (65) Red air outlet (69) Air outlet for PBS (66) First cooling fan (67) Second cooling fan (68) Third cooling fan (71) First rear intake window (72) Second rear intake window (73) Third rear intake window (74) Bottom intake window (8) Channel network

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G02F 1/13357 G03B 21/14 A G03B 21/00 F21W 131: 406 21/14 F21Y 101: 00 // F21W 131: 406 F21M 1/00 Z F21Y 101: 00 7/00 L (72) Inventor Michihiro Kurokawa 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Hiromitsu Yoshiyuki 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Shoji Okazaki 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Taichi Yoshimura 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F term (reference) 2H088 EA14 EA19 EA68 HA12 HA18 HA21 HA24 HA28 MA20 2H091 FA02Z FA08X FA08Z FA14Z FA26X FA26Z FA41Z FD12 FD13 LA04 LA30 3K014 LA01 LB03 MA02 MA05 MA06 MA08 3K042 AA01 AC06 BA04 BB03 CC03 CC04 CC05

Claims (3)

[Claims] 1. A projector device for projecting image light using a lamp unit (4) as a light source, wherein the lamp unit (4) is constructed by installing a lamp (5) in a housing (41). The lamp includes a reflector (51), a light emitting part (50) provided at a focal position of the reflector (51) or a position in the vicinity thereof, and a translucent plate (53) covering a front opening of the reflector (51). The unit (4) has an air inlet (52) for introducing air from the outside of the lamp (5) toward the light emitting part (50) and air introduced from the air inlet (52) to the lamp ( 5) Air outlet port (5)
4) is opened, and the blower fan (44) is connected to the air inlet (52) through the duct (47), and the light emitting part (50) is forcedly cooled by the operation of the blower fan (44). A projector device characterized by the above. 2. The air inlet port (52) and the air outlet port (54) are each opened near the opening edge of the reflector (51) and are inclined toward the light emitting part (50). The projector device according to 1. 3. A lamp (5) is provided inside the housing (41).
The projector device according to claim 1 or 2, wherein an exhaust fan (40) is installed at a rear position of the.