JP5580960B2 - Structure of reflector in projector - Google Patents

Description

  The present invention relates to a structure of a reflector in a projector.

  A projector having a concave hemispherical reflecting surface that reflects the light emitted from the lamp to the inner surface of the lamp shade whose front end portion is closed with a front glass and irradiates the front end with a croaker has been conventionally provided. .

JP-A-10-208503 Japanese Patent Laid-Open No. 08-273403 Japanese Patent Application Laid-Open No. 07-065619 JP 2005-346968 A

By the way, the hemispherical reflecting surface as described above has a problem that the light from the lamps does not easily reach far due to mutual interference, so that there is a problem that the portion to be illuminated has insufficient illuminance. Instead of a reflective surface,
A polygonal pyramid-shaped reflector that is polygonal in the circumferential direction and has a proximal end that opens from the end toward the end;
If you specify a more specific structure,
・ A polygonal pyramid-shaped reflector that is polygonal in the circumferential direction and opens at three or more steps from the base end to the tip toward the base, and the inner surface of the lamp shade of the projector We are considering using it as a reflector.

  However, in the case of a reflector having a polygonal pyramid shape or a polyhedral pyramid shape as described above, the components constituting the reflector or the joining of the components to each other are rivets when manufacturing such a reflector. Where it is reasonable to perform the joining, in the case of the reflector that has been joined by rivet joining, if this is installed on the inner surface of the lamp shade of the projector, the interior of the lamp shade of the projector is closed by the front glass. Is sealed, and in the case of a projector, since the lamp and the reflector are close to each other in distance, the reflector receives the heat of the lamp particularly strongly. This causes a problem that the desired reflection is not performed due to distortion and deformation.

  In addition, the polyhedral pyramid-shaped reflector that has been provided as a reflector for downlights for high ceilings lacks consideration for the loss of light from the light source. The area of the reflection surface portion of the step portion is too larger than the area of the reflection surface portion of the third step portion, so that the light reflected on the reflection surface portion of the first step portion and the second step portion, particularly the reflection surface portion of the first step portion. It is suitable for the light source, increasing the loss of light, and there is a limit to increasing the illuminance, both as a reflector for downlights for high ceilings and even as a reflector for projectors.

  In view of the above-described problems, the present invention is such that the reflecting plate has a polygonal pyramid shape or a polyhedral pyramid shape, and the reflecting plate components or the reflecting plate components are joined to each other. Reflection at the projector, which is made by rivet bonding, can maintain appropriate reflection characteristics against thermal expansion and contraction due to lamp heat, and can increase light intensity by reducing light loss. It is an object to provide a structure of a plate.

The above-described problem is a structure of a reflector in a projector that is provided on the inner surface of a lamp shade whose front end is closed by a front glass, reflects the light emitted from the lamp, and irradiates the front of the tip.
The reflecting plate is formed in a polygonal shape in the circumferential direction, has a polygonal pyramid shape in which the base end opens from the end toward the end, and components constituting the reflecting plate are in the circumferential direction. At least one rivet joint is formed, and the base plate has a reflector plate component and the tip plate has a reflector plate component.
The rivet through-hole formed in the reflector component has a perfect circle shape, and the hole diameter is set to be 0.3 mm or more larger than the outer diameter of the rivet shaft portion. The problem is solved by the structure of the reflector in the projector, characterized in that the action can be caused to slip (first invention).

  In this structure, the reflector has a polygonal pyramid shape in which the base plate has a polygonal shape in the circumferential direction and the base end opens from the end toward the end, and is a reflector component or reflector. The rivet through-hole formed in the reflector component part has a perfect circle shape, and the hole diameter is larger than the outer diameter of the rivet shaft part. Is set to be larger than 0.3 mm so that slippage can be generated with respect to the expansion and contraction of the reflector due to the heat of the lamp. Appropriate reflection characteristics can be maintained against the thermal expansion and contraction caused by.

  Moreover, since the rivet through hole has a perfect circle shape, it is possible to slide in any direction along the surface, and it is not necessary to form the rivet through hole in consideration of the direction of sliding, and the rivet through hole can be easily formed. can do.

  In the first invention, it is preferable that the reflecting plate has a polyhedral pyramidal cylinder shape that is opened at different angles by three or more steps from the base end to the front end (second invention).

  In this case, the reflector is in the shape of such a polyhedral pyramid, and the reflector is made by rivet joining the reflector components or reflector components. As described above, the rivet through-hole formed in the reflector component has a perfect circle shape, and the hole diameter is set to be 0.3 mm or more larger than the outer diameter of the rivet shaft portion. Since slippage can be generated with respect to the expansion and contraction deformation action, the reflection plate can maintain an appropriate reflection characteristic against the thermal expansion and contraction due to the lamp heat. it can.

In the second invention, the ratio of the height dimension of the first step portion with the base end to the height dimension of the intermediate second step portion and the height dimension of the third step portion with the tip end is 1: 1-3: set to 3-5,
The angle of each reflective surface portion of the first step portion with respect to the surface orthogonal to the light irradiation center direction is set in a range of 135 ° to 155 °, and the angle of each reflective surface portion of the second step portion with respect to the reflective surface portion of the first step portion Is set in the range of 160 ° to 180 °, and the angle of each reflective surface portion of the third step portion with respect to the reflective surface portion of the second step portion is preferably set in the range of 160 ° to 180 ° (third invention). .

  In this case, the ratio of the height dimension of the first step portion with the base end to the height dimension of the intermediate second step portion and the height dimension of the third step portion with the tip end is as described above. And setting the angles of the reflective surface portions of each step as described above can effectively reduce the surface areas of the reflective surface portions of the first step portion and the second step portion with the base end. At the same time, it is possible to avoid the light reflected by the reflecting surface portions of the first step portion and the second step portion from being directed to the light source, and to reduce the light loss, thereby effectively increasing the illuminance as a projector. Can be raised.

  Since the structure of the reflector in the projector of the present invention is as described above, the reflector has a polygonal pyramid shape or a polyhedral pyramid shape, and is a reflector component or reflector. It is possible to maintain an appropriate reflection characteristic against thermal expansion and contraction due to lamp heat while being made by joining the components by rivet joining. In addition, the light loss can be reduced and the illuminance can be increased.

FIG. 1A is a front view of a projector, FIG. 2B is a front view of a reflecting plate, and FIG. 1C is a front view showing a reflecting plate in the projector. Fig. (A) is a front view showing the rivet joints of the second step portion and the third step portion, Fig. (B) is a front view showing the rivet joint portions in the circumferential direction of the second step portion, and Fig. (C) is the rivet. The cross-sectional front view of the joint portion and FIG. FIGS. 1A and 1B are an enlarged front view and a plan view of the reflecting plate. FIG. 1A is a front view of the same section of the reflecting plate, and FIG. 2B is an inner view of the reflecting plate.

  Next, embodiments of the present invention will be described with reference to the drawings.

  In the structure of the embodiment shown in FIGS. 1 to 4, 1 is a projector, 2 is a reflector, and the reflector 2 has a mirror surface on the inner surface, as shown in FIGS. In the projector 1, the tip is provided on the inner surface of the lamp shade 4 closed by the front glass 3, the light emitted from the lamp 5 is reflected, and the tip is irradiated to the crocodile through the front glass 3. (B) As shown in (b), it is a polygon in the circumferential direction, and in the case of this embodiment, it is a hexagon, and the base end is opened at three different angles from the end toward the end. If it is expressed in a polygonal pyramid shape, more specifically, it is a polyhedral pyramid shape.

And in this embodiment, as shown to FIG. 3 (A) (B), the reflector 2 comprises the component 6 which comprises the 1st step part of a base end, and the intermediate | middle 2nd step part. A component 7, a component 8 constituting the third step portion of the tip, and a component 9 for shape retention on the proximal end side,
Each of the component parts 6, 7, and 8 of the first to third stage portions is refracted in multiple stages in the circumferential direction, and as shown in FIGS. 3 (a) and 2 (b), the circumferential direction Are produced by hitting rivets 10 to the overlapping portions 6a, 7a, 8a formed in one place in
As shown in FIGS. 3A and 3B, the reflector 2 is formed between the base end portion of the first stage partial component 6 and the shape retaining component 9 as shown in FIGS. Rivets 10 are struck on the overlapping portions 9b, and the rivets 10 are struck on the overlapping portions 6b formed between the first-stage partial component 6 and the second-stage partial component 7, and It is manufactured and configured by hitting rivets 10 on overlapping portions 7b formed between the second stage partial component 7 and the third stage partial component 8.

  The rivet through-holes 11 formed in the reflector component parts 6, 7, 8, and 9 have a perfect circle shape as shown in FIGS. The outer diameter d2 of the rivet shaft portion is set to be 0.3 mm or more, and due to the balance between the diameter difference and the tightness of each rivet 10, slippage occurs with respect to the expansion / contraction deformation action of the reflector due to lamp heat. It has been made so that it can.

  Further, in the reflection plate 2, the height dimension h1 of the first step portion 6 with the base end, the height dimension h2 of the intermediate second step portion 7, and the third step portion 8 with the tip end of the third step portion 8. The ratio to the height dimension h3 is set to 1: 1 to 3: 3 to 5, and the angle θ1 of each reflecting surface portion of the first step portion 6 with respect to the surface orthogonal to the light irradiation center direction is 135 ° to 155. The angle θ2 of each reflecting surface portion of the second step portion 7 with respect to the reflecting surface portion of the first step portion 6 is set in a range of 160 ° to 180 °, and the second step portion 7 with respect to the reflecting surface portion The angle θ3 of each reflecting surface portion of the three-stage portion 8 is set in a range of 160 ° to 180 °.

  According to the above structure, the reflecting plate 2 is formed in a polygonal shape in the circumferential direction, and has a polygonal pyramid shape in which the base end opens from the side toward the side, particularly in the present embodiment, the base end. It consists of a polygonal pyramidal cylinder that is opened at three different angles from the side of the jaw toward the side of the jaw, and the reflecting plate component parts 6, 7, 8 to the reflecting plate component parts 6, constituting the same. The rivet through holes 11 formed in each of the reflector component parts 6, 7, 8, 9 are formed in a perfect circle shape while being manufactured by joining the 7, 8, 9 with the rivets 10 ... Thus, the hole diameter d1 is set to be 0.3 mm or more larger than the outer diameter d2 of the shaft portion of the rivet 10 so that slippage can be generated against the expansion / contraction deformation action of the reflector 2 due to the heat of the lamp 5. Because of such slipping, the projector 1 Oite, its reflection plate 2, it is possible to maintain the proper reflection properties against the thermal expansion and contraction due to heat of the lamp 5.

  Moreover, since each rivet through hole 11 has a perfect circle shape, it is possible to slide in any direction along the surface, and it is not necessary to form the rivet through hole in consideration of the sliding direction. Can be easily.

  In addition, in the present embodiment, the rivet through holes 11 and 11 formed in the overlapping plate portions are formed in the same size, so that the rivet through holes 11 and 11 can be easily formed. can do.

  In the present embodiment, the height dimension h1 of the first step portion 6 with the proximal end, the height dimension h2 of the intermediate second step portion 7, and the height of the third step portion 8 with the distal end portion. Since the ratio to the dimension h3 is set as described above, and the angles θ1, θ2, and θ3 of the reflecting surface portions of the respective steps are set as described above, the first step portion 6 and the second step portion having the base end are set. The surface area of the reflection surface portion of the step portion 7 can be effectively reduced, and light reflected by the reflection surface portions of the first step portion 6 and the second step portion 7 can be prevented from being directed to the light source. Loss can be reduced, and thereby the illuminance as the projector 1 can be effectively increased.

DESCRIPTION OF SYMBOLS 1 ... Floodlight 2 ... Reflector 3 ... Front glass 4 ... Lamp shade 5 ... Lamp 6 ... 1st step part (reflector component)
7. Second stage part (reflector component)
8 ... Third stage part (reflector component)
10 ... Rivet 11 ... Rivet through hole

Claims (2)

The structure of the reflector in the projector is provided on the inner surface of the lamp shade whose tip is closed by the front glass, and reflects the light emitted from the lamp to irradiate the tip with the tip.
The reflection plate is formed in a polygonal shape in the circumferential direction, and has a polygonal pyramid cylinder shape that opens at three or more steps from the base end to the tip toward the back, and the reflection plate Is formed by riveting a reflector plate component having a base end and a reflector plate component having a tip end to be riveted at least in one place in the circumferential direction.
The rivet through-hole formed in the reflector component has a perfect circle shape, and the hole diameter is set to be 0.3 mm or more larger than the outer diameter of the rivet shaft portion. A structure of a reflecting plate in a projector, characterized in that a slip can be generated with respect to an action so that a desired appropriate reflection characteristic as a projector is maintained . The ratio of the height dimension of the first step portion of the proximal end, the height dimension of the intermediate second step portion, and the height dimension of the third step portion of the leading end is 1: 1 to 3: 3. Set to ~ 5,
The angle of each reflective surface portion of the first step portion with respect to the surface orthogonal to the light irradiation center direction is set in a range of 135 ° to 155 °, and the angle of each reflective surface portion of the second step portion with respect to the reflective surface portion of the first step portion 2. The projector according to claim 1 , wherein the angle is set in a range of 160 ° to 180 °, and an angle of each reflection surface portion of the third step portion with respect to the reflection surface portion of the second step portion is set in a range of 160 ° to 180 °. Structure of reflector in

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