JP2012163654A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector capable of preventing blackening of an arc tube by suppressing excessive cooling of the arc tube in a standby state.SOLUTION: A projector 1 comprises: a light source device 100 including an arc tube 10, a reflector 20 and a holding member 30; an air inlet 32 and an air outlet 34 provided on the holding member 30 for cooling the arc tube 10; and a control part 800 for controlling power to be supplied to the arc tube 10 depending upon whether the projector is in a normal state where prescribed power is supplied to the arc tube 10 or a standby state where power smaller than the prescribed power is supplied to the arc tube 10. The projector 1 further comprises shutter mechanisms 40a and 40b switchable between an open state and a close state and provided on a side of at least one of the air inlet 32 and the air outlet 34, and the control part 800 places the shutter mechanisms 40a and 40b in the open state when the normal state is detected, and places them in the close state when the standby state is detected.

Description

  The present invention relates to a projector.

  The projector has a structure that cools the arc tube because the arc tube of the light source device becomes high temperature due to light emission, but if the temperature rises too much, the arc tube is damaged or deteriorated. For example, openings are provided on the intake side and exhaust side of the holding member that accommodates the arc tube to form a cooling air flow path, the cooling air is blown from the intake fan to cool the arc tube, and then discharged by the exhaust fan. Therefore, a configuration for cooling the arc tube is known.

  For power saving and other purposes, when the projector power is on and there is no input signal (hereinafter referred to as the standby state), power that is smaller than the predetermined power normally supplied to the arc tube is supplied. A projector has been proposed (see, for example, Patent Document 1). In the projector described in Patent Document 1, in the standby state, the power supplied to the arc tube is reduced and the cooling fan is stopped.

Japanese Patent No. 4378110

  By the way, if the arc tube is overcooled and the temperature of the arc tube is too low, the halogen cycle of the base material of the electrode is not performed normally, and blackening occurs due to adhesion to the inner wall of the arc tube. Then, the portion is devitrified, the amount of light emitted from the arc tube is reduced, and the temperature of the arc tube is increased to cause breakage or deterioration of the arc tube. In the standby state, since the electric power supplied to the arc tube is reduced and the calorific value of the arc tube is reduced, it is desirable to keep the arc tube warm by stopping the flow of cooling air.

  In the projector described in Patent Document 1, there is a description that the cooling fan is stopped in the standby state, but the exhaust fan is not mentioned. Since the air is discharged to the outside when the exhaust fan is operating in the standby state, the air flows through the flow path of the cooling air even when the cooling fan is stopped. Even if the cooling fan and the exhaust fan are stopped, the air inside the holding member having the highest temperature in the projector has a temperature higher than that through the opening of the holding member constituting the cooling air flow path. It will flow outside the lower holding member. If it does so, there exists a subject that the temperature of an arc_tube | light_emitting_tube falls too much and there exists a possibility that the arc tube may blacken.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes a light-emitting device that emits a light beam, a reflector that fixes the light-emitting tube and reflects the light beam, and a holding member that holds the reflector; The holding member is provided with an opening on the intake side through which cooling air for cooling the arc tube is introduced, an opening on the exhaust side from which the cooling air is discharged, and the power supplied to the arc tube is controlled. Is provided on at least one of the intake side and the exhaust side, and can be switched between an open state in which the opening is opened and a closed state in which the opening is closed. It is characterized by having a simple shutter mechanism.

  According to this configuration, the shutter mechanism is provided on at least one of the intake side and the exhaust side provided on the holding member of the light source device. For this reason, the cooling air that cools the arc tube flows through the holding member when the opening is opened by the shutter mechanism, but does not flow through the holding member when the opening is closed by the shutter mechanism. Thereby, in the state where the calorific value of the arc tube is reduced, excessive cooling of the arc tube can be suppressed by closing the opening, thereby preventing the arc tube from being blackened due to excessive temperature drop. Can do.

  Application Example 2 In the projector according to the application example described above, the control unit supplies a normal state in which predetermined electric power is supplied to the arc tube and electric power smaller than the predetermined electric power to the arc tube. Preferably, the power supplied to the arc tube is controlled in a standby state, the shutter mechanism is in the open state in the normal state, and the shutter mechanism is in the closed state in the standby state. .

  According to this configuration, the shutter mechanism opens the opening in the normal state and closes the opening in the standby state. For this reason, the cooling air for cooling the arc tube circulates inside the holding member in the normal state, but does not circulate inside the holding member in the standby state. This suppresses excessive cooling of the arc tube in a standby state in which electric power smaller than the normal state is supplied, so that the arc tube can be prevented from being blackened due to excessive temperature drop.

  [Application Example 3] In the projector according to the application example described above, the control unit may be configured such that in a weak operation state in which power between the electric power in the normal state and the electric power in the standby state is supplied to the arc tube. It is preferable that the shutter mechanism covers a part of the opening.

  According to this configuration, a part of the opening is covered by the shutter mechanism in the weak driving state. This optimizes the amount of cooling air flowing inside the holding member in a weak operation state where power smaller than the normal state and larger than the standby state is supplied, so the temperature decreases while cooling the arc tube. It is possible to prevent the arc tube from being blackened due to passing.

  Application Example 4 In the projector according to the application example described above, the control unit changes the power supplied to the arc tube in the weak operation state in a stepwise manner, and copes with a step change in the power. It is preferable that the aperture ratio of the opening by the shutter mechanism is changed stepwise.

  According to this configuration, the aperture ratio of the opening by the shutter mechanism changes stepwise in response to a step change in power supplied to the arc tube. It is possible to prevent the arc tube from being blackened due to the temperature dropping too much.

  Application Example 5 In the projector according to the application example described above, an intake fan that blows the cooling air to the opening on the intake side, and an exhaust fan that discharges the cooling air from the opening on the exhaust side; The control unit operates the intake fan and the exhaust fan in the normal state, and in the standby state, at least the shutter mechanism of the intake fan and the exhaust fan on the side where the shutter mechanism is not provided. It is preferable to stop the fan.

  According to this configuration, the arc tube can be effectively cooled by including the intake fan and the exhaust fan. Further, since the fan on the side where the shutter mechanism is not provided is stopped in the standby state, the arc tube can be prevented from being blackened due to the temperature of the arc tube being excessively lowered.

1 is a schematic diagram illustrating a schematic configuration of a projector according to a first embodiment. The schematic diagram which shows schematic structure of the control part which concerns on 1st Embodiment. FIG. 3 is a schematic diagram illustrating a schematic configuration of a shutter mechanism according to the first embodiment. The figure explaining the structure of the principal part which concerns on 1st Embodiment, and the flow of cooling air. The figure explaining the structure of the principal part which concerns on 2nd Embodiment, and the flow of cooling air. FIG. 9 is a schematic diagram illustrating a schematic configuration of a shutter mechanism according to a first modification. FIG. 9 is a schematic diagram illustrating a schematic configuration of a shutter mechanism according to Modification 2.

  An embodiment of the present invention will be described below with reference to the drawings. In each of the drawings to be referred to, the dimensional ratios, angles, and the like of the respective constituent elements are appropriately changed for easy understanding of the configuration.

(First embodiment)
<Projector>
First, the projector according to the first embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector according to the first embodiment. The projector 1 according to the first embodiment is an electronic device that modulates a light beam emitted from a light source in accordance with image information and enlarges and projects it on a projection surface such as a screen.

  In the following drawings and description, the direction in which the light beam is emitted from the light source device 100 is defined as + X direction, and the upward direction in the drawing view of FIG. 1 is defined as + Z direction. Furthermore, the right side from the illuminated region side toward the arc tube 10 is defined as the + Y direction, which is orthogonal to the X direction and the Z direction. That is, the directions indicated by X, Y, and Z are orthogonal to each other.

  As shown in FIG. 1, the projector 1 includes an exterior case 2, a light source device 100, an illumination optical device 200, a color separation optical device 300, a relay optical device 400, an electro-optical device 500, and a projection optical device 600. An intake fan 700 and an exhaust fan 710 for cooling, a pair of shutter mechanisms 40a and 40b, and a control board (not shown) on which a control unit 800 (see FIG. 2) and various circuits are mounted. . The light source device 100, the illumination optical device 200, the color separation optical device 300, the relay optical device 400, the electro-optical device 500, the projection optical device 600, the intake fan 700, the exhaust fan 710, the shutter mechanisms 40a and 40b, and the control board are exterior cases. 2 is fixed.

  The light source device 100 includes an arc tube 10 that emits a light beam, a reflector 20, a parallelizing concave lens 22, and a holding member 30. The light source device 100 reflects the light beam emitted from the arc tube 10 by the reflector 20 so as to align the emission direction, and converts the light beam into substantially parallel light by the collimating concave lens 22 and emits it toward the illumination optical device 200. The illumination optical axis OC is a central axis of a light beam emitted from the light source device 100 to the illuminated region side (+ X side).

  The arc tube 10 has a light emitting portion 12 and a pair of sealing portions extending on both sides thereof. When electric power is supplied from the controller 800, the arc tube 10 is turned on and emits a luminous flux. As the arc tube 10, various arc tubes that emit light with high luminance can be adopted, and for example, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a metal halide lamp, or the like can be adopted. The arc tube 10 is held by the reflector 20 and accommodated in the holding member 30.

  Here, the arc tube 10 generates heat by emitting light, but the temperature rise of the light emitting unit 12 is large, and the upper (+ Z side) temperature rises more easily than the lower part due to the influence of thermal convection. If the temperature of the light emitting unit 12 is excessively increased, the base material of the light emitting unit 12 is recrystallized to cause white turbidity, which may cause damage or deterioration of the arc tube 10. Further, the temperature of the tip end portion 14 of the sealing portion located on the light emission side (+ X side) of the arc tube 10 is also likely to rise. Therefore, it is desirable to effectively cool the light emitting part 12 and the tip part 14 of the arc tube 10.

  On the other hand, if the temperature of the light emitting unit 12 is excessively decreased due to excessive cooling, the halogen cycle of the base material of the electrode in the light emitting unit 12 is not performed normally, and blackening occurs due to adhesion to the inner wall of the light emitting unit 12. End up. When blackening occurs, the portion is devitrified, the amount of light emitted from the light emitting unit 12 is reduced, and the temperature of the light emitting unit 12 is increased to cause breakage or deterioration of the arc tube 10.

  The reflector 20 has a reflective surface on the inner surface facing the arc tube 10 and reflects the light emitted from the arc tube 10 toward the + X side. The holding member 30 is provided so as to surround the reflector 20, and holds the reflector 20. For example, the holding member 30 is formed in a substantially cylindrical shape from a heat-resistant synthetic resin material. The collimating concave lens 22 is held at the center of the + X side end of the holding member 30.

  On the side surface of the holding member 30 (surface formed by the X direction and the Z direction), an intake port 32 as an intake side opening portion and an exhaust port 34 as an exhaust side opening portion are located on the + X side of the reflector 20. Ventilation holes 36 and 38 are provided on the rear side (−X side) of the reflector 20.

  The air inlet 32 is disposed on the −Y side with respect to the illumination optical axis OC. The exhaust port 34 is disposed on the + Y side with respect to the illumination optical axis OC so as to face the intake port 32. A metal mesh is disposed at the intake port 32 and the exhaust port 34 for dust prevention. Further, the air vent 36 is disposed on the same side as the air inlet 32. The vent 38 is disposed on the exhaust fan 710 side so as to face the vent 36.

  The illumination optical device 200 includes a first lens array 210, a second lens array 220, a polarization conversion element 230, and a superimposing lens 240. The illumination optical device 200 divides the light beam emitted from the light source device 100 into a plurality of partial light beams, aligns each partial light beam with approximately one type of polarized light, and three liquid crystal devices 520R, 520G, and 520B that are illumination targets. Are superimposed on the light incident surface.

  The color separation optical device 300 includes a first dichroic mirror 310, a second dichroic mirror 320, and a reflection mirror 330. The color separation optical device 300 separates the light beam emitted from the illumination optical device 200 into three color lights of red (R) light, green (G) light, and blue (B) light.

  The relay optical device 400 includes an incident side lens 410, a relay lens 420, and reflection mirrors 430 and 440. The relay optical device 400 guides the B light separated by the color separation optical device 300 to the B light liquid crystal device 520B. In the present embodiment, the relay optical device 400 is configured to guide the B light. However, the present invention is not limited to this. For example, the relay optical device 400 may be configured to guide the R light.

  The electro-optical device 500 includes field lenses 510R, 510G, and 510B, an incident side polarizing plate (not shown), liquid crystal devices 520R, 520G, and 520B as light modulation devices, an exit side polarizing plate (not shown), a cross And a dichroic prism 530. The incident side polarizing plate and the emission side polarizing plate are provided for each of the liquid crystal devices 520R, 520G, and 520B.

  The liquid crystal devices 520R, 520G, and 520B modulate each color light separated by the color separation optical device 300 according to image information. The cross dichroic prism 530 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed at the interface where the right angle prisms are bonded together. The cross dichroic prism 530 synthesizes the color lights modulated by the liquid crystal devices 520R, 520G, and 520B and emits them to the projection optical device 600 side.

  The projection optical device 600 is composed of a combined lens in which a plurality of lenses are combined, and enlarges and projects the light beam modulated and synthesized by the electro-optical device 500 onto a projection surface such as a screen.

  The intake fan 700 is arranged on the light emission side (+ X side) and the side where the intake port 32 is provided with respect to the holding member 30. A duct 702 is connected to the tip of the intake fan 700, and the opening 702 a at the tip of the duct 702 is disposed so as to face the intake port 32. The intake fan 700 blows cooling air for cooling the arc tube 10 from the intake port 32 into the holding member 30 via the duct 702. The intake fan 700 is composed of, for example, a sirocco fan.

  The exhaust fan 710 is disposed on the side opposite to the intake fan 700 with respect to the holding member 30 so as to face the exhaust port 34 and the ventilation port 38. The exhaust fan 710 discharges the air heated by cooling the arc tube 10 out of the outer case 2. The exhaust fan 710 is constituted by an axial fan, for example.

  The shutter mechanism 40a is disposed between the holding member 30 and the duct 702, and can be switched between an open state in which the intake port 32 is opened and a closed state in which the intake port 32 is closed. The shutter mechanism 40b is disposed between the holding member 30 and the exhaust fan 710, and can be switched between an open state in which the exhaust port 34 is opened and a closed state in which the exhaust port 34 is closed. The configuration and operation of the shutter mechanisms 40a and 40b will be described later.

  Next, the control unit of the projector according to the first embodiment will be described with reference to FIG. FIG. 2 is a schematic diagram illustrating a schematic configuration of a control unit according to the first embodiment. As shown in FIG. 2, the control unit 800 includes a CPU (Central Processing Unit) 801, a storage unit 802, an image signal input unit 803, an operation signal input unit 804, a light source control unit 805, and a shutter mechanism control unit. 806 and a fan control unit 807 are provided.

  The CPU 801 functions as a computer that performs overall control of the operation of the projector 1. A storage unit 802 includes a RAM (Random Access Memory) used for temporary storage of various data, a mask ROM (Read Only Memory) and a flash for storing a control program for controlling the operation of the projector 1, various setting data, and the like. Non-volatile memory such as a memory.

  The image signal input unit 803 takes in an image signal input from an external device via a plurality of connection terminals (not shown) provided outside the exterior case 2, detects the presence or absence of the image signal, and has a predetermined format. Processing such as conversion to image information is performed.

  The operation signal input unit 804 is configured to turn on / off the power to the projector 1, switch the input source, and change the image to black or blue via an operation panel or a remote controller (not shown) provided outside the exterior case 2. An input operation signal for performing various instructions such as switching to a mute state set for a predetermined image is received.

  The light source control unit 805 controls the operation of turning on and off the arc tube 10 and also controls the power supplied to the arc tube 10. The shutter mechanism control unit 806 performs control to switch the shutter mechanisms 40a and 40b between an open state and a closed state. The fan control unit 807 performs control to switch the intake fan 700 and the exhaust fan 710 between an operating state and a stopped state.

  The state in which the projector 1 is turned on, the light beam emitted from the arc tube 10 is modulated based on an image signal input from an external device, and an image is projected on the projection surface is referred to as a normal state. . In a normal state, the light source control unit 805 supplies predetermined power (hereinafter referred to as normal power) to the arc tube 10.

  Further, a state in which no image signal is input to the image signal input unit 803 even when the power of the projector 1 is on is referred to as a standby state. The standby state includes a mute state and the like. In the standby state, the control unit 800 supplies the arc tube 10 with power smaller than normal power, for example, predetermined power of about 20% to 30% of normal power (hereinafter referred to as standby power). The

  In general, a lamp used as a light emitting tube of a projector cannot be turned on again until it is cooled to a temperature at which the lamp can be turned on again (for example, about 1 minute). Therefore, if you are projecting an image on the projection surface using a projector at a meeting, etc., and you want to stop projecting the image for a short period of time, project the image once the projector is on standby and the lamp is lit. You can resume projection as soon as you want to resume.

  However, if power is normally supplied to the lamp even in the standby state, the lamp continues to generate heat, shortening the life of the lamp and wasting power. Therefore, in the projector 1 according to the present embodiment, in the standby state, by supplying standby power smaller than normal power to the arc tube 10, heat generation of the arc tube 10 is suppressed and power consumption is suppressed.

  In a normal state, when no image signal is input to the image signal input unit 803 or when an operation signal for switching to the mute state is input to the operation signal input unit 804, the control unit 800 shifts the projector 1 to a standby state. Let Along with the transition to the standby state, the light source control unit 805 switches the power supplied to the arc tube 10 to standby power, and the shutter mechanism control unit 806 switches the shutter mechanisms 40a and 40b from the open state to the closed state.

  In the standby state, when an image signal is input to the image signal input unit 803 or when an operation signal for canceling the mute state is input to the operation signal input unit 804, the control unit 800 shifts the projector 1 to the normal state. Let Along with the transition to the normal state, the light source control unit 805 switches the power supplied to the arc tube 10 to normal power, and the shutter mechanism control unit 806 switches the shutter mechanisms 40a and 40b from the closed state to the open state.

<Configuration and operation of shutter mechanism>
Next, the configuration and operation of the shutter mechanism according to the first embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a schematic diagram illustrating an example of the configuration of the shutter mechanism according to the first embodiment. Specifically, FIG. 3 is a view of the shutter mechanism on the intake port side as viewed from the intake fan side, FIG. 3 (a) is a view showing an open state, and FIG. 3 (b) is a view from the open state to the closed state. It is a figure which shows the state in the middle, and FIG.3 (c) is a figure which shows the obstruction | occlusion state. FIG. 4 is a diagram illustrating the configuration of the main part and the flow of cooling air according to the first embodiment. Specifically, FIG. 4A is a diagram illustrating a normal state, and FIG. 4B is a diagram illustrating a standby state.

  As shown in FIGS. 3A, 3 </ b> B, and 3 </ b> C, the shutter mechanism 40 a includes a plate-shaped shutter 42, a gear 44, and a gear 46. The shutter 42 has, for example, a substantially rectangular shape having a long side and a short side, and has an area that can cover the air inlet 32. The shutter 42 is fixed to the gear 44 on one side of the short sides. The gear 44 rotates about the rotation shaft 45 as a rotation center. The gear 46 is screwed with the gear 44 and rotates together with a shaft 48 that is driven by a motor (not shown) and rotates. The gears 44 and 46 are disposed, for example, on the −X side of the intake port 32 as viewed from the −Y side of the holding member 30.

  In the open state of the intake port 32 shown in FIG. 3A, the shutter 42 is disposed on the −X side of the intake port 32 as viewed from the −Y side of the holding member 30 so that the long side is along the Z direction. Yes. Note that the air inlet 32 is disposed so as to overlap the distal end portion 14 of the arc tube 10. Further, an exhaust port 34 (not shown) is also arranged so as to overlap the tip portion 14 of the arc tube 10.

  Here, when the gear 46 is rotated clockwise together with the shaft 48 by being driven by the motor in accordance with an instruction from the control unit 800 (shutter mechanism control unit 806), the gear 44 screwed with the gear 46 rotates counterclockwise. Then, as shown in FIG. 3B, the shutter 42 rotates together with the gear 44 counterclockwise about the rotation shaft 45 as a rotation center. Then, as shown in FIG. 3C, the gear 46 is stopped when the shutter 42 rotates approximately 90 degrees from the open state and the long side of the shutter 42 rotates to the position covering the intake port 32 along the X direction. As a result, the shutter mechanism 40a is in a closed state where the shutter mechanism 40a covers and closes the intake port 32.

  In the closed state of the intake port 32 shown in FIG. 3C, when the gear 46 rotates counterclockwise according to the instruction of the control unit 800, the shutter 42 rotates clockwise together with the gear 44, as shown in FIG. It becomes an open state. Thus, by controlling the rotation direction and rotation speed of the gear 46 (the rotation angle of the shutter 42) with the control unit 800, the open state and the closed state can be switched. The shutter mechanism 40a may have a configuration in which the gears 44 and 46 are disposed on the + X side of the intake port 32.

  Although not shown, the shutter mechanism 40b on the exhaust port 34 side has the same configuration as the shutter mechanism 40a. The shutter mechanism 40b may have a configuration in which the gears 44 and 46 are disposed on the −X side of the exhaust port 34 or a configuration in which the gears 44 and 46 are disposed on the + X side.

  Next, the flow of cooling air in the normal state and the standby state will be described. In a normal state in which normal-time power is supplied to the arc tube 10, as shown in FIG. 4A, the shutter mechanisms 40a and 40b are in an open state in which the intake port 32 and the exhaust port 34 are opened (FIG. 3). (See (a)). In addition, both the intake fan 700 and the exhaust fan 710 are operating. Thereby, the flow path through which the cooling air W1 flows is formed on the + X side of the reflector 20 inside the holding member 30.

  The cooling air W <b> 1 blown from the intake fan 700 is introduced from the intake port 32 disposed so as to face the opening 702 a of the reflector 20 of the duct 702 into the flow path on the + X side of the reflector 20 in the holding member 30. . And the cooling air W1 distribute | circulates the inside of the holding member 30 so that the reflective surface of the reflector 20 may be followed, and the arc tube 10 is cooled. Thereby, the light emission part 12 and the front-end | tip part 14 of the arc_tube | light_emitting_tube 10 are cooled effectively. Cooling air W <b> 1 heated by cooling the arc tube 10 is discharged from the exhaust port 34 to the outside of the holding member 30, and discharged to the outside of the projector 1 by the exhaust fan 710.

  In addition, an air flow path from the vent 36 to the vent 38 is formed on the −X side of the reflector 20 in the holding member 30. As a result, an air flow from the air vent 36 toward the air vent 38 is generated, and the warmed air W2 around the −X side inside the holding member 30 and around the holding member 30 is discharged to the outside of the projector 1 by the exhaust fan 710. .

  Next, in a standby state in which standby power is supplied to the arc tube 10, the shutter mechanisms 40 a and 40 b are respectively controlled by the control unit 800 as shown in FIG. Is closed (see FIG. 3C), and the flow path of the cooling air W1 inside the holding member 30 is closed. Thereby, the cooling air W1 for cooling the light emitting part 12 and the tip part 14 of the arc tube 10 does not flow.

  Here, as described above, when the light emitting unit 12 is excessively cooled and the temperature is excessively decreased, the light emitting unit 12 is blackened, which causes damage or deterioration of the light emitting tube 10. In the standby state, since the standby power smaller than the normal power is supplied to the arc tube 10, the amount of heat generated by the light emitting unit 12 decreases. Therefore, in the standby state, it is desirable to stop the cooling of the light emitting unit 12 and suppress the temperature drop of the light emitting unit 12. In the present embodiment, since the temperature drop of the light emitting unit 12 is suppressed by closing the flow path of the cooling air W1 with the shutter mechanisms 40a and 40b, the occurrence of blackening of the light emitting unit 12 can be suppressed.

  Even if the intake fan 700 is in operation, the cooling air W1 is not introduced into the holding member 30 from the intake port 32. Therefore, the intake fan 700 may be stopped or may remain in operation. The exhaust fan 710 may be stopped or may be kept operating, but is operated so that the warmed air W2 around the −X side inside the holding member 30 and around the holding member 30 is discharged to the outside. It is preferable to leave it as it is.

  As described above, according to the configuration of the projector 1 according to the first embodiment, the following effects can be obtained.

  Shutter mechanisms 40 a and 40 b are provided in at least one of the intake port 32 and the exhaust port 34 provided in the holding member 30 of the light source device 100. The shutter mechanisms 40a and 40b open the intake port 32 and the exhaust port 34 when the normal state is detected, and close the intake port 32 and the exhaust port 34 when the standby state is detected. For this reason, the cooling air W1 for cooling the arc tube 10 flows through the holding member 30 in the normal state, but does not flow through the holding member 30 in the standby state. Thereby, in the standby state where power smaller than the normal state is supplied, excessive cooling of the arc tube 10 can be suppressed, so that the arc tube 10 can be prevented from being blackened due to excessive temperature drop.

(Second Embodiment)
<Projector>
Next, a projector according to a second embodiment will be described with reference to FIG. The projector according to the second embodiment differs from the projector according to the first embodiment in that a shutter mechanism is provided only on the exhaust port side of the holding member, but the other configurations are substantially the same. is there. Therefore, the main part of the projector according to the second embodiment will be described here.

  FIG. 5 is a diagram for explaining the configuration of the main part and the flow of cooling air according to the second embodiment. Specifically, FIG. 5A is a diagram illustrating a normal state, and FIG. 5B is a diagram illustrating a standby state. In addition, about the component which is common in 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 5A and 5B, the projector 1A according to the second embodiment includes the shutter mechanism 40b on the exhaust port 34 side, but the intake port 32 does not include the shutter mechanism. . Therefore, the intake port 32 is open in both the normal state and the standby state. In the normal state shown in FIG. 5A, the shutter mechanism 40b is in an open state in which the exhaust port 34 is opened. Both the intake fan 700 and the exhaust fan 710 are operating. Thereby, since the cooling air W1 flows through the + X side flow path of the reflector 20 in the holding member 30, the light emitting portion 12 and the tip portion 14 of the arc tube 10 are cooled.

  In the standby state shown in FIG. 5B, the control of the control unit 800 causes the shutter mechanism 40b to be in a closed state in which the exhaust port 34 is closed, and the operation of the intake fan 700 is stopped. Then, the cooling air W <b> 1 is not introduced into the holding member 30 from the intake port 32, and the air inside the holding member 30 is not discharged from the exhaust port 34 to the outside of the holding member 30. Thereby, since the cooling air W1 does not flow through the + X side of the reflector 20 inside the holding member 30, the temperature decrease of the light emitting unit 12 is suppressed. As a result, the occurrence of blackening of the light emitting unit 12 can be suppressed as in the first embodiment.

  The exhaust fan 710 may be stopped or may be kept operating, but is operated so that the warmed air W2 around the −X side inside the holding member 30 and around the holding member 30 is discharged to the outside. It is preferable to leave it as it is.

  As described above, according to the configuration of the projector 1A according to the second embodiment, the same effect as that of the projector 1 according to the first embodiment can be obtained. Further, according to the configuration of the projector 1A according to the second embodiment, since only one shutter mechanism is required, space saving and cost reduction can be realized as compared with the projector 1 according to the first embodiment. it can.

  Note that the projector 1A according to the second embodiment may have a configuration in which the shutter mechanism 40a is provided on the intake port 32 side instead of the shutter mechanism 40b on the exhaust port 34 side. In such a configuration, in the standby state, the intake fan 700 may be stopped or kept operating, but the exhaust fan 710 is stopped.

(Third embodiment)
<Projector>
Next, a projector according to a third embodiment will be described. The projector according to the third embodiment further has a weak operation state in which power that is a value between normal power and standby power is supplied to the arc tube with respect to the projector according to the first embodiment. Although the point is different, other configurations are almost the same. Illustrations and descriptions of components common to the first embodiment are omitted.

  The projector (not shown) according to the third embodiment further has a weak operation state in addition to the normal state and the standby state. The weak operating state refers to a state in which electric power that is smaller than normal power and larger than standby power is supplied to the arc tube 10. In the weak operation state, the control unit 800 (light source control unit 805) performs control so that, for example, 80% of normal power is supplied to the arc tube 10. By performing such control, when an image based on an input image signal is a dark scene, an image projected in a dark scene is displayed darker, and an image projected in a bright scene is displayed. The dynamic contrast between them can be increased. In addition, by performing such control, the power supplied to the arc tube 10 is made smaller than the normal power when projecting an image on a projection surface in a dark environment (such as a room), thereby reducing power consumption. It is possible to suppress heat generation of the arc tube 10 as well as to suppress it.

  In the projector according to the third embodiment, in the weak operation state, the control unit 800 (shutter mechanism control unit 806) is configured such that the shutter mechanisms 40a and 40b cover portions of the intake port 32 and the exhaust port 34, respectively. To do. More specifically, as shown in FIG. 3B, in a state where the shutter 42 of the shutter mechanism 40a covers a part of the intake port 32, for example, in a state where the opening ratio of the intake port 32 is 50%, The rotation of the gear 44 and the shutter 42 is stopped.

  Similarly, with respect to the shutter mechanism 40b, the rotation of the gear 44 and the shutter 42 is stopped in a state where the shutter 42 covers a part of the exhaust port 34. At this time, the cooling air W1 is introduced into the holding member 30 from the portions of the intake port 32 and the exhaust port 34 that are not covered by the shutter 42 (see FIG. 4A). The air volume is reduced compared to the normal state (open state). For this reason, the cooling efficiency of the arc tube 10 by the cooling air W1 is lowered.

  In the weak operation state, the electric power supplied to the arc tube 10 is smaller than the normal power, so that the calorific value of the arc tube 10 is reduced. Therefore, the air volume of the cooling air W1 that cools the arc tube 10 is reduced so that the shutter mechanisms 40a and 40b cover part of the air inlet 32 and the air outlet 34. Thereby, since the temperature fall of the light emission part 12 is suppressed, generation | occurrence | production of the blackening of the light emission part 12 is suppressed.

  In the weak operation state, the power supplied to the arc tube 10 may be changed stepwise, for example, 90%, 80%, 60%, etc. with respect to the normal power. In this way, it is possible to set the brightness and power consumption of an image to be projected more adaptively to the brightness of the video based on the image signal and the usage environment (room, etc.). Further, in such a case, the opening ratios of the intake port 32 and the exhaust port 34 by the shutter mechanisms 40a and 40b are appropriately stepped, for example, 70%, 50%, 30%, etc., corresponding to the step change of electric power. Thus, the air volume of the cooling air W1 can be adjusted according to the heat generation amount of the arc tube 10 without changing the rotational speed of the intake fan 700 or the exhaust fan 710.

  Here, as described above, the temperature of the upper portion and the tip portion 14 of the light emitting portion 12 in the arc tube 10 is more likely to rise than other portions. Therefore, when the air volume of the cooling air W <b> 1 is reduced in the weak operation state, it is desirable that the flowing cooling air W <b> 1 is directed toward the upper part and the tip part 14 of the light emitting unit 12. In the projector according to the third embodiment, as shown in FIG. 3A, the gears 44 and 46 of the shutter mechanism 40a are arranged on the −X side of the air inlet 32, and as shown in FIG. In a state where the shutter 42 covers a part of the intake port 32, the + Z side and the + X side of the intake port 32 are not covered. Although not shown, the gears 44 and 46 of the shutter mechanism 40 b are disposed on the −X side of the exhaust port 34, and the shutter 42 covers a part of the exhaust port 34 and the + Z side of the exhaust port 34. And the + X side is not covered. Thereby, the cooling air W <b> 1 can be made to flow toward the upper part and the tip part 14 of the light emitting part 12.

  When the projector 1 is used in a stationary posture in which the projector 1 is installed on a desk or the like and a ceiling posture in which the stationary posture is inverted upside down, the shutter 42 of the shutter mechanisms 40a and 40b is open in any posture. The one side fixed to the gear 44 is set to the + Z side. In this way, in any posture, the cooling air W1 can flow toward the upper part and the tip part 14 of the light emitting part 12 in the weak driving state.

  The projector of the present invention has been described based on the above embodiment, but the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. As modifications, for example, the following can be considered.

(Modification 1)
The configuration of the shutter mechanism in the projector of the present invention is not limited to the above embodiment. The shutter mechanism may be configured as shown in FIG. FIG. 6 is a schematic diagram illustrating a schematic configuration of the shutter mechanism according to the first modification. Specifically, FIG. 6 is a view of the shutter mechanism on the intake port side as viewed from the intake fan side, FIG. 6 (a) is a view showing the open state, and FIG. 6 (b) is a view from the open state to the closed state. It is a figure which shows the state in the middle, and FIG.6 (c) is a figure which shows the obstruction | occlusion state. Since the shutter mechanism on the exhaust port side has the same configuration, the illustration is omitted. Constituent elements common to the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 6A, 6B, and 6C, the shutter mechanism 50 according to Modification 1 includes a plate-shaped shutter 52 and a pinion gear 56. In the shutter 52, a rack gear 54 is formed on one long side. The pinion gear 56 is screwed with the rack gear 54 and rotates with a shaft 58 that is driven by a motor (not shown) and rotates.

  The shutter 52 moves to the + X side when the pinion gear 56 rotates counterclockwise in the open state as shown in FIG. 6 (a), and the pinion gear 56 in the closed state as shown in FIG. 6 (c). It moves to -X side by rotating clockwise. Thereby, the intake port 32 (exhaust port 34) can be switched between an open state and a closed state.

  Also in the shutter mechanism 50 according to the modified example 1, as illustrated in FIG. 6B, the rotation of the pinion gear 56 is stopped in a state where the shutter 52 covers a part of the intake port 32 (exhaust port 34). Thus, the air volume of the cooling air W1 that cools the arc tube 10 can be reduced in response to the weak operation state in the third embodiment.

(Modification 2)
The shutter mechanism in the projector of the present invention may have the configuration shown in FIG. FIG. 7 is a schematic diagram illustrating a schematic configuration of a shutter mechanism according to the second modification. Specifically, FIGS. 7A and 7C are views of the intake side shutter mechanism as viewed from the intake fan side, and FIGS. 7B and 7D are views of the intake side shutter mechanism from the + X side. FIG. FIGS. 7A and 7B are views showing an open state, and FIGS. 7C and 7D are views showing a closed state. Since the shutter mechanism on the exhaust port side has the same configuration, the illustration is omitted. Constituent elements common to the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 7A, 7 </ b> B, 7 </ b> C, and 7 </ b> D, the shutter mechanism 60 according to Modification 2 includes a plurality of plate-shaped shutters 62, two pairs of support members 63 and 64, and the like. , And gears 66 and 67. Both ends of the plurality of shutters 62 are pivotally supported by support members 63 and 64 at two fulcrums. The position of the support member 63 is fixed, and the support point on the support member 63 side of the shutter 62 located at one end on the + Z side is fixed to the gear 66. The gear 67 is screwed with the gear 66 and rotates together with a shaft 68 that is driven by a motor (not shown) and rotates.

  As shown in FIG. 7B, when the gear 67 rotates clockwise in the opened state, the shutter 62 fixed to the gear 66 rotates counterclockwise, and the other shutters 62 pivot on the support member 64. Rotates counterclockwise while supported. 7D, when the gear 67 rotates counterclockwise in the closed state, the shutter 62 fixed to the gear 66 rotates clockwise, and the other shutters 62 also support the support member 64. Rotate clockwise while pivotally supported by. Thereby, the intake port 32 (exhaust port 34) can be switched between an open state and a closed state.

  Although illustration is omitted, also in the shutter mechanism 60 according to the second modification, the plurality of shutters 62 are stopped between the open state and the closed state, thereby corresponding to the weak operation state in the third embodiment. Thus, the air volume of the cooling air W1 for cooling the arc tube 10 can be reduced.

  DESCRIPTION OF SYMBOLS 1,1A ... Projector, 10 ... Light-emitting tube, 20 ... Reflector, 30 ... Holding member, 32 ... Intake port as an opening part of an intake side, 34 ... Exhaust port as an opening part of an exhaust side, 40a, 40b, 50, 60 ... Shutter mechanism, 700 ... Intake fan, 710 ... Exhaust fan, 800 ... Control unit, W1 ... Cooling air.

Claims (5)

A light source device having an arc tube that emits a light beam, a reflector that fixes the arc tube and reflects the light beam, and a holding member that holds the reflector;
An intake side opening provided in the holding member for introducing cooling air for cooling the arc tube, and an exhaust side opening for discharging the cooling air;
A control unit for controlling the power supplied to the arc tube,
A projector comprising a shutter mechanism provided on at least one of the intake side and the exhaust side and capable of switching between an open state in which the opening is opened and a closed state in which the opening is closed.   The control unit controls power supplied to the arc tube in a normal state in which predetermined power is supplied to the arc tube and a standby state in which electric power smaller than the predetermined power is supplied to the arc tube. The projector is characterized in that the shutter mechanism is in the open state in the normal state and the shutter mechanism is in the closed state in the standby state. The projector according to claim 2,
In the weak operation state in which the electric power between the electric power in the normal state and the electric power in the standby state is supplied to the arc tube, the control unit sets the shutter mechanism to cover a part of the opening. Projector. The projector according to claim 3,
The control unit changes the electric power supplied to the arc tube in the weak operation state in a stepwise manner, and changes the aperture ratio of the opening by the shutter mechanism in accordance with the stepwise change in the electric power. A projector that is characterized by being changed. The projector according to any one of claims 1 to 4,
An intake fan that blows the cooling air to the opening on the intake side, and an exhaust fan that discharges the cooling air from the opening on the exhaust side,
The control unit operates the intake fan and the exhaust fan in the normal state, and stops at least the fan on the side where the shutter mechanism is not provided among the intake fan and the exhaust fan in the standby state. Projector.

Images