JP4622381B2 - Projector light source - Google Patents

Description

  The present invention relates to a projector light source used in a projector that projects an output image projected from a projection lens onto a screen.

Conventionally, a light source provided with a bulb 3 at the center of a shade-shaped reflecting mirror is used in this type of projector. In a liquid crystal projector, light from this light source is passed through a polarizing plate and a liquid crystal panel, and an image is projected from a projection lens. In this case, since the polarizing plate and the liquid crystal panel are likely to generate heat, there is one provided with a fan for cooling the polarizing plate and the liquid crystal panel (see, for example, Patent Document 1).
JP-A-8-29874

  However, in the DMD projector in which the display image of the DMD is enlarged and displayed by the projection lens, a polarizing plate and a liquid crystal are not used. The bulb is covered with glass, and the melting point of this glass is about 1000 ° C., and it is necessary to use it at a temperature below this for safety. However, conventionally, since there is no cooling means for the light source, the temperature may be exceeded depending on the long-time use or installation location, so that it has been used with the utmost care.

  In addition, the projector is installed on a table and used in the same manner as the projector is hung from the ceiling. Even when the temperature on the top side of the valve is 900 ° C. and the temperature on the bottom side is 750 ° C. (temperature difference is preferably 150 ° C.) in the table state, heat is trapped near the ceiling in the ceiling state. The top part may become 680 ° C. or lower, and the valve may be prone to failure. For this reason, cooling of the light source has been desired. Patent Document 1 describes a configuration for cooling the polarizing plate and the liquid crystal panel, but does not describe a configuration for effectively cooling the light source.

  An object of the present invention is to provide a projector light source capable of effectively cooling a light source and preventing a failure due to a heat change.

A projector light source according to the present invention is a ring-shaped frame attached to a leading edge of the reflecting mirror in a projector light source including a reflecting mirror having a mirror surface on an inner surface and a bulb provided in the reflecting mirror. Fixed to the frame and attached to the front of the reflecting mirror and at a position not exposed to light rays reflected from the reflecting mirror, the rear part is inclined toward the center of the reflecting mirror and the front part is the outer periphery of the reflecting mirror. A guide surface inclined in the direction, and fins formed on both sides of the guide surface and having both wings open to the side, and air is blown toward the guide surface disposed outside the fin. comprising a fan, wherein the frame is fitted to the tip end of the step portion of the inner circumference formed a ring-shaped said reflector, when the fin is attached to the projecting portion provided on the frame co The guide surface of the fins, by being deployed inside the reflector alongside side of the valve when viewed from the front, the passage between the frame and the guide surface is formed, of the fan The cooling air generated by the rotation is configured to flow in the central direction of the reflecting mirror through the passage along the guide surface of the fin.

According to the projector light source, the guide surface of the fin is disposed inside the reflector on the lateral side of the bulb when viewed from the front, so that a passage is formed between the guide surface and the frame. Therefore, when the air is blown toward the fin, the cooling air is blown into the reflecting mirror through the passage along the guide surface of the fin, and the light source that is most likely to generate heat is cooled by the cooling air. In particular, since the cooling air is blown right next to the valve, the top and bottom of the valve are uniformly cooled, and even when used in both the table and ceiling hanging positions, the temperature difference between the top and bottom of the valve is 150 It becomes possible to be within a preferable range of within ° C. Moreover, since both wings are opened in an eight-letter shape, the wind from the fan is collected on the guide surface, and the wind can be sent into the reflector without waste.

  According to the present invention, the light source can be effectively cooled, and failure due to heat change can be prevented.

  Embodiments of a projector light source according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a partially cutaway side view of a projector light source according to the present invention, and FIG. 2 is a front view of the projector light source.

  As shown in each figure, the light source 1 includes a shade-shaped reflecting mirror 2 having a mirror surface 2 a having an arc shape on the inner surface, and a bulb 3 disposed in the reflecting mirror 2. The bulb 3 is supported by the reflecting mirror 2 by the support member 4 and is arranged at the center of the reflecting mirror 2 so that the light emitting portion 3a at the tip faces the bottom surface of the mirror surface 2a. A conductive wire (not shown) for energizing the valve 3 is attached to the support member 4.

  A ring-shaped frame 5 is attached to the tip edge of the reflecting mirror 2. The frame 5 is formed with a ring-shaped step 5a on the inner periphery and a protrusion 5b on the front surface. The step 5a is fitted into the tip edge of the reflecting mirror 2, and a fin is formed on the front surface of the protrusion 5b. 6 is attached.

As shown in FIG. 3, the fin 6 has both wings 8 formed at both end edges of the front guide surface 7, and the guide surface 7 and the guide surface 7 of the both wings 8 are shown in FIG. 3. In such a state, it is inclined in a direction protruding forward as it goes down. Both wings 8 have a shape opened sideways in an eight-letter shape. Therefore, in a state where the fins 6 are attached to the frame 5 , as shown in FIG. 1, the guide surface 7 is inclined with the rear portion inclined toward the center of the reflecting mirror 2 and the front portion toward the outer peripheral direction. A passage 9 is formed between the frame 5 and the frame 5 . Further, as shown in FIG. 2, the guide surface 7 of the fin 6 is disposed inside the reflecting mirror 2 on the lateral side of the bulb 3 when viewed from the front, so that the guide surface 7 and the frame 5 The passage 9 is formed between them. In FIG. 2, a fan 11 rotated by a motor 10 is provided on the side of the fin 6. As shown in FIG. 1, the fin 6 is attached to a position that does not reach the light beam L that is emitted from the reflecting mirror and focuses. This is because if the light beam L is blocked, the image is disturbed .

When the fan 11 is rotated by the motor 10, the cooling air passes through the passage 9 along the fin 6 and the guide surface 7, and as shown by the arrow in FIG. A large amount of fluid flows in the direction, that is, in the direction of the valve 3, and the cooling effect can be enhanced.

FIG. 4 shows another example of the structure of the fin 6, in which a bent connecting portion 12 having a triangular side surface is formed between the guide surface 7 and both wings 8. As a result, the lower end of the guide surface 7 has a shape that largely protrudes forward in the state shown in FIG. Can do. By changing the inclination angle of the bent connecting portion 12, the inclination angle of the guide surface 7 can be changed.

  As described above, since the fin 6 and the fan 11 that blows air toward the fin 6 are provided in front of the reflecting mirror 2, the light source 1 that is most likely to generate heat can be cooled with cooling air. Even when used at both the ceiling-suspended positions, the top and bottom of the valve can be cooled uniformly, so that the temperature difference between the top and bottom of the valve 3 can be kept within a preferable range of 150 ° C. or less.

FIG. 2 is a partially cutaway side view showing an embodiment of a projector light source according to the present invention. The front view of the light source for projectors of this invention. The perspective view of a fin. The perspective view which shows the other structural example of a fin.

DESCRIPTION OF SYMBOLS 1 Light source 2 Reflector 2a Mirror surface 3 Valve 5 Frame 6 Fin 7 Guide surface 8 Both wings
9 Passage 11 Fan

Claims (1)

In a projector light source comprising a reflecting mirror having a mirror surface on the inner surface, and a bulb provided in the reflecting mirror,
A ring-shaped frame attached to the leading edge of the reflecting mirror;
Fixed to the frame and attached to the front of the reflecting mirror and at a position not exposed to light rays reflected from the reflecting mirror, the rear portion is inclined toward the center of the reflecting mirror and the front portion is directed toward the outer periphery of the reflecting mirror. An inclined guide surface, and fins having both wings formed on both sides of the guide surface and opened sideways in an octagonal shape;
A fan disposed on the outside of the fin for blowing air toward the guide surface;
With
In the frame, a ring-shaped step formed on the inner periphery is fitted into the tip edge of the reflecting mirror, the fin is attached to a protrusion provided on the frame, and the guide surface of the fin is The passage is formed between the guide surface and the frame by being arranged on the side of the bulb on the side of the bulb when viewed from the front, and the cooling air generated by the rotation of the fan A light source for a projector, wherein the light source is configured to flow along the guide surface of the fin, through the passage, and to flow toward the center of the reflecting mirror.

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