JP2016212289A - Optical device, light-shielding structure, and light-shielding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device capable of suppressing the decrease of exhaust capability, while having a light-shielding property.SOLUTION: A projector 10 includes a housing 11, a light source 12 which is provided in the housing 11, and a duct 1 which exhausts air in the housing 11 to the outside of the housing 11. The duct 1 includes a suction port 112 for sucking the air in the housing 11, an exhaust port 111 for exhausting the sucked air, a louver 21 which is provided on the side of the suction port 112 and includes a plurality of first light-shielding plates extending in substantially parallel to the extending direction of the duct 1, and a second louver 22 which is provided on the side of the exhaust port 111 and includes a plurality of second light-shielding plates extending diagonally relative to the extending direction of the duct 1.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an optical device, a light shielding structure, and a light shielding method, and particularly to an optical device having a light source in a housing, a light shielding structure, and a light shielding method.

  Optical devices that use light inside are known, such as projectors and laser processing devices. In such an optical apparatus, since heat is generated inside, an exhaust port for discharging the air inside is required.

  On the other hand, there is a part (light source, etc.) that emits strong light in the housing of the optical device, and light emitted from that part is diffused and reflected on every surface in the housing. Light enters the exhaust vent from a random direction. Unnecessary light leaking from the exhaust port may not allow the light inside the housing to go out because of deterioration in the quality of the image projected by the projector or for safety reasons. It becomes.

  Generally, in such a situation, a louver structure having a light shielding property is employed (for example, see Patent Document 1). In Patent Document 1, a light-shielding portion that includes a fan that cools and exhausts the light source inside the housing and includes a light-shielding piece that is perpendicular to the air flow at the exhaust port, a horizontal light-shielding piece, and a light-shielding piece that extends obliquely is provided. By arranging appropriate gaps above and below, a cooling structure that has light shielding properties and can be exhausted is realized. In addition, Patent Documents 2 and 3 are known as related techniques.

JP-A-11-167166 JP 2013-120249 A JP 2009-210862 A

  However, a related technique such as Patent Document 1 employs a light shielding structure that is perpendicular to the wind flow in order to ensure light shielding performance. For this reason, there is a problem that the wind hits the light shielding structure, the air flow is obstructed, and the exhaust capacity is reduced.

  In view of the above-described problems, an object of the present invention is to provide an optical device, a light shielding structure, and a light shielding method capable of suppressing a decrease in exhaust capacity while having light shielding properties.

  An optical device according to the present invention includes a housing, a light source provided inside the housing, and a duct that exhausts air inside the housing to the outside of the housing, and the duct includes the housing An air intake port that intakes internal air, an exhaust port that exhausts the intake air, and a plurality of first light-shielding plates that are provided on the intake port side and extend substantially parallel to the extending direction of the duct A first louver and a second louver provided on the exhaust port side and having a plurality of second light shielding plates extending obliquely with respect to the duct extending direction.

  The light-shielding structure according to the present invention includes a duct that exhausts air inside a housing having a light source to the outside of the housing, and the duct includes an air inlet that sucks air inside the housing and the air that has been sucked in. An exhaust port for exhausting, a first louver provided on the intake port side and having a plurality of first light-shielding plates extending substantially parallel to the extending direction of the duct, provided on the exhaust port side, And a second louver having a plurality of second light shielding plates extending obliquely with respect to the duct extending direction.

  The light-shielding method according to the present invention is a light-shielding method using a duct that exhausts air inside a housing having a light source to the outside of the housing, and a plurality of first methods extending substantially parallel to the extending direction of the duct. A first louver having a plurality of light shielding plates, which sucks air inside the housing from the air inlet and has a plurality of second light shielding plates extending obliquely with respect to the extending direction of the duct, The air taken in by the first louver is exhausted to the exhaust port.

  According to the present invention, it is possible to provide an optical device, a light shielding structure, and a light shielding method that have a light shielding property and can suppress a decrease in exhaust capability.

1 is a schematic configuration diagram of a projector according to Embodiment 1. FIG. 2 is an external perspective view of a duct according to Embodiment 1. FIG. 2 is an external front view of a duct according to Embodiment 1. FIG. 3 is a schematic configuration diagram of a duct according to Embodiment 1. FIG. 3 is a schematic configuration diagram of a first louver of the duct according to Embodiment 1. FIG. 4 is a schematic configuration diagram of a second louver of the duct according to Embodiment 1. FIG. 4 is a schematic configuration diagram of a second louver of the duct according to Embodiment 1. FIG. 5 is a schematic configuration diagram of a duct according to Comparative Example 1. FIG. It is a schematic block diagram of the duct which concerns on the comparative example 2. It is explanatory drawing for demonstrating the effect of the duct which concerns on Embodiment 1. FIG. It is a schematic block diagram of the duct which concerns on other embodiment.

(Embodiment 1)
The first embodiment will be described below with reference to the drawings.

  FIG. 1 shows a schematic configuration of a projector according to the present embodiment. As shown in FIG. 1, the projector 10 according to the present embodiment includes a housing 11, a light source 12, a projection lens 13, and a duct 1. In this embodiment, an example of a projector is mainly described. However, the present invention is not limited to a projector, and may be another optical device having a light source therein.

  The casing 11 is an exterior case that accommodates each part of the projector 10, and includes the light source 12, the projection lens 13, the duct 1, and other components necessary for realizing the functions of the projector inside the casing 11. . The housing 11 has, for example, an exhaust port 111 for exhausting air around the light source 12 inside the housing to the outside on the side surface.

  The light source 12 is a light emitting device that emits (emits) light. The light source 12 mainly emits light toward the projection lens 13, but the emitted light is diffused or reflected to the entire inside of the casing including the duct. The light source 12 is also a heating element that generates heat together with light emission (light emission). As an example, the light source 12 is a mercury lamp, a halogen lamp, a laser module, or the like. The projection lens 13 optically processes the light emitted from the light source 12 and projects the light onto an external projection surface. The projection lens 13 is, for example, a lens unit including a plurality of lenses, converts the radiated light emitted from the light source 12 into parallel light, and emits the parallel light to the outside.

  The duct 1 is an exhaust duct for guiding the internal air provided in the housing to the exhaust port 111. The duct 1 is disposed so as to extend substantially linearly from, for example, the vicinity of the light source 12 inside the housing toward the outside of the housing. The duct 1 suppresses an increase in the heat inside the housing by exhausting the air that has become hot around the light source 12 to the outside. It can be said that the duct 1 includes the intake port 112 on the inside of the housing and the exhaust port 111 on the housing side. The duct 1 sucks air inside the housing from the intake port 112 and discharges the sucked air from the exhaust port 111.

  FIG. 2 is a perspective view of the duct according to the present embodiment as viewed from the intake port side, and FIG. 3 is a front view of the duct according to the present embodiment as viewed from the exhaust port side.

  As shown in FIG.2 and FIG.3, the duct 1 is provided with the duct main body 1a which is a cylindrical member with a rectangular cross section. An opening on the inside of the housing, which is one end of the duct body 1a, serves as an intake port 112, and an opening on the housing, which is the other end of the duct body 1a, serves as an exhaust port 111.

  A louver 21 and a louver 22 are provided inside the duct body 1a. When the duct 1 is viewed from the inlet 112 side by the louver 21 and the louver 22, the inside of the duct can be seen as shown in FIG. 2, and when the duct 1 is seen from the other outlet 111 side, the inside of the duct is seen as shown in FIG. It has no structure.

  4 shows a schematic structure of a cross section of the duct 1 according to the present embodiment, FIG. 5 shows only the louver 21 of the duct 1 of FIG. 4, and FIGS. 6 and 7 show the louver 22 of the duct 1 of FIG. Only shows.

  As shown in FIG. 4, a louver (first louver) 21 is provided inside the duct 1 on the intake port 112 side, and a louver (second louver) 22 is provided on the exhaust port 111 side. Louver 21 and louver 22 are arranged at a distance Ld apart.

  The louver 21 on the intake port 112 side includes a plurality of light shielding pieces 211 that are plate-shaped light shielding members. The light shielding pieces 211 extend horizontally in the flow of exhaust (air), and are formed in a plurality in one direction in a plane perpendicular to the flow of exhaust. That is, the light shielding piece 211 is disposed so as to extend substantially in parallel with the duct extending direction (exhaust direction).

  As shown in FIG. 5, the light shielding pieces 211 of the louver 21 on the inlet 112 side extend in the same horizontal direction as the wind (air) flow (the duct extending direction) with a length L1, and the spacing between the light shielding pieces 211. Are in a row at p1. The angle of the light beam from which light leaks from two adjacent light shielding pieces 211 is Θ1. The angle Θ1 (first optical linear angle) is a line (optical straight line) drawn from one end (intake port side) 211a of the light shielding piece 211 to the other end (exhaust port side) 211b of the lower light shielding piece 211, This is the angle formed with the line in the direction in which the light shielding piece 211 extends. The angle Θ1 is determined by the length L1 of the light shielding piece 211 and the interval p1 between the light shielding pieces 211.

  As shown in FIG. 4, the louver 22 on the exhaust port 111 side is provided at a distance Ld from the louver 21 in the wind (air) flow direction. The louver 22 includes a plurality of light shielding pieces 221 that are bent plate-like light shielding members. The light shielding piece 221 includes a piece 221a extending in the same horizontal direction (the duct extending direction) as the flow of exhaust (air), and a piece 221b extending obliquely from the horizontal piece 221a to the flow of exhaust. The piece 221a is a parallel light-shielding piece provided on the louver 21 side and extending substantially in parallel with the duct extending direction (exhaust direction), and the piece 221b is provided on the exhaust port 111 side with respect to the duct extending direction. It can also be said that it is an oblique light shielding piece extending obliquely. The piece 221a extends in the same horizontal direction as the air flow (the duct extending direction) by a length L2, and the piece 221b extends from the end of the piece 221a in a direction oblique to the air flow by a length L3. The angle formed by the horizontal piece 221a and the oblique piece 221b is Θ2. A plurality of light shielding pieces 221 are formed in one direction in a plane perpendicular to the flow of exhaust, and the intervals between the light shielding pieces 221 are arranged in a line at p2.

  As shown in FIG. 6, the horizontal piece 221a and the oblique piece 221b of the light shielding piece 221 one lower below the tip 221c (the exhaust port side end of the piece 221b) from which the piece 221b of the light shielding piece 221 extends obliquely. The angle formed by the light beam 31 drawn on the convex portion (corner portion) 221d (the end portion on the louver 21 side of the piece 221b) in contact is θ3 (second optical linear angle). As shown in FIG. 7, from the convex part (corner part) 221d (exhaust port side end part of the piece 221a) where the horizontal piece 221a and the oblique piece 221b of the light shielding piece 221 contact each other, The angle formed by the light beam 32 drawn at one end 221e of the horizontal piece 221a (the louver 21 side end of the piece 221a) is θ4 (third optical linear angle). Angles Θ3 to Θ4 are angles at which light leaks when looking into the direction of the louver 21 from the direction of the louver 22 (inside from the exhaust port side).

  In the present embodiment, by providing the louver 21 and the louver 22 in the duct 1 as described above, the obliquely extending angle of the light shielding piece 221 can be made closer to the wind flow than the structure of the related technology. Since the light can be shielded and the obliquely extending angle of the light shielding piece 221 is almost horizontal, air resistance can be suppressed and high exhaust performance can be realized.

  8 and 9 show a comparative example in the case where the light shielding performance and the exhaust performance cannot be achieved at the same time. As shown in FIG. 8, the duct 800 of Comparative Example 1 includes a louver 810 and a louver 820. The light shielding piece 811 of the louver 810 extends obliquely with respect to the air flow (the duct extending direction), and the light shielding piece 821 of the louver 820 extends obliquely in the direction opposite to the light shielding piece 811. As shown in FIG. 8, when the light shielding piece of the louver is tilted from the wind flow, the light shielding is possible by the two light shielding pieces. However, since the wind strikes the light shielding pieces of the louver 810 and the louver 820, the exhaust performance decreases. .

  On the other hand, as shown in FIG. 9, the duct 900 of the comparative example 2 includes a louver 910 and a louver 920 in order to improve the exhaust performance. The light shielding piece 911 of the louver 910 and the light shielding piece 921 of the louver 920 extend in the same direction, that is, horizontally with respect to the air flow. As shown in FIG. 9, when two horizontal louver structures are used for the wind flow, although the exhaust performance is improved, the light cannot be shielded, so that the light shielding property is lowered.

  On the other hand, in the present embodiment, the structure shown in FIGS. 4 to 7 is adopted in consideration of the compatibility between the light shielding property and the ease of wind flow. When the louver 22 is Θ3 <Θ4, it is impossible to block the light with the louver 22 alone. However, when the louver 21 satisfies Θ1 <Θ3, the louver 21 and the louver 22 have a large flow path and a low air resistance. The pair can be shielded from light.

  The optimum structure of the present embodiment is to reduce Θ3 while satisfying Θ1 <Θ3 because the shape of louver 21 and louver 22 is horizontal to the wind flow and the wind passage is better as Θ3 is smaller.

  In addition, since the structural condition of the present embodiment does not depend on the distance Ld between the louver 21 and the louver 22, a space can be provided between the louver 21 and the louver 22. By providing this space, air flows between the louver 21 and the louver 22 as shown in FIG. 10, so that the air flow 41 passes through the louver 22 without being limited, and the air resistance can be reduced. It is possible to exhaust efficiently.

  As described above, in the present embodiment, the duct includes the first louver including the horizontal light shielding plate and the second louver including the oblique light shielding plate, thereby maintaining the light shielding property and exhausting. A decrease in ability can be suppressed. In particular, by setting Θ1 <Θ3, the light shielding property and the exhaust performance can be reliably improved.

(Other embodiments)
As another embodiment, the duct may be configured as shown in FIG. As described in the first embodiment, since the louver 22 has the light shielding piece 221 that is oblique to the flow of wind, a closed path is structurally formed below the lowermost light shielding piece 221. Therefore, as shown in FIG. 11, an air guide plate 222 that guides air from the louver 21 is added so that air does not collect in the bag path. The air guide plate 222 is disposed obliquely from the end portion on the louver 21 side of the lowermost light shielding piece 221 to the duct body 1a. The wind guide plate 222 can guide the flow of the wind toward the exhaust port, so that the exhaust can be effectively performed.

  In addition, a fan (exhaust fan) 411 that guides air from the louver 21 may be added to the space between the louver 21 and the louver 22. The fan 411 can enhance the flow of wind, and thus can be more effectively exhausted.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Duct 1a Duct main body 10 Projector 11 Case 12 Light source 13 Projection lens 21, 22 Louver 31, 32 Light beam 111 Exhaust port 112 Inlet port 211 Light-shielding piece 221 Light-shielding piece 221a, 221b Piece 222 Air guide plate 411 Fan

Claims (8)

A housing,
A light source provided inside the housing;
A duct for exhausting air inside the housing to the outside of the housing;
With
The duct is
An air inlet for sucking air inside the housing;
An exhaust port for exhausting the intake air;
A first louver provided on the inlet side and having a plurality of first light-shielding plates extending substantially parallel to the extending direction of the duct;
A second louver provided on the exhaust port side and having a plurality of second light shielding plates extending obliquely with respect to the duct extending direction;
An optical device comprising: The second light shielding plate is provided on the first louver side, is provided on the exhaust port side with a parallel light shielding piece portion extending substantially parallel to the duct extending direction, and extends in the duct extending direction. Including an oblique shading piece extending obliquely with respect to the
The optical device according to claim 1. Of the adjacent first light-shielding plates included in the plurality of first light-shielding plates, the second louver of the other first light-shielding plate from the inlet side end of one first light-shielding plate. The angle of the light straight line to the side edge is the first light straight line angle,
Among the second light shielding plates adjacent to each other in the plurality of second light shielding plates, the other second light shielding from the first louver side end of the oblique light shielding piece of one second light shielding plate. The angle of the light straight line to the exhaust port side end of the oblique light shielding piece part of the plate is the second light straight line angle,
The first light linear angle is smaller than the second light linear angle;
The optical device according to claim 2. Of the adjacent second light shielding plates included in the plurality of second light shielding plates, the other second light shielding from the first louver side end of the parallel light shielding piece of one second light shielding plate. The angle of the light straight line to the exhaust port side end of the parallel light shielding piece of the plate is the third light straight line angle,
The second light linear angle is smaller than the third light linear angle;
The optical device according to claim 3. An air guide plate for guiding the air through the first louver to the second louver;
The optical apparatus as described in any one of Claims 1 thru | or 4. An exhaust fan that guides air through the first louver to the second louver;
The optical device according to any one of claims 1 to 5. A duct for exhausting air inside the housing having a light source to the outside of the housing;
The duct is
An air inlet for sucking air inside the housing;
An exhaust port for exhausting the intake air;
A first louver provided on the inlet side and having a plurality of first light-shielding plates extending substantially parallel to the extending direction of the duct;
A second louver provided on the exhaust port side and having a plurality of second light shielding plates extending obliquely with respect to the duct extending direction;
With a light shielding structure. A light shielding method using a duct for exhausting air inside a housing having a light source to the outside of the housing,
The first louver having a plurality of first light shielding plates extending substantially parallel to the extending direction of the duct draws air inside the housing from an air inlet,
The second louver having a plurality of second light shielding plates extending obliquely with respect to the extending direction of the duct exhausts air taken in by the first louver to an exhaust port,
Shading method.

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